Added mstats fields

.circleci/config.yml

@@ -0,0 +1,122 @@
+version: 2.1
+
+commands:
+  submodules:
+    steps:
+      - run:
+          name: "Pull submodules"
+          command: git submodule update --init
+  llvm-source-linux:
+    steps:
+      - restore_cache:
+          keys:
+            - llvm-source-14-v3
+      - run:
+          name: "Fetch LLVM source"
+          command: make llvm-source
+      - save_cache:
+          key: llvm-source-14-v3
+          paths:
+            - llvm-project/clang/lib/Headers
+            - llvm-project/clang/include
+            - llvm-project/compiler-rt
+            - llvm-project/lld/include
+            - llvm-project/llvm/include
+  hack-ninja-jobs:
+    steps:
+      - run:
+          name: "Hack Ninja to use less jobs"
+          command: |
+            echo -e '#!/bin/sh\n/usr/bin/ninja -j3 "$@"' > /go/bin/ninja
+            chmod +x /go/bin/ninja
+  build-binaryen-linux:
+    steps:
+      - restore_cache:
+          keys:
+            - binaryen-linux-v2
+      - run:
+          name: "Build Binaryen"
+          command: |
+            make binaryen
+      - save_cache:
+          key: binaryen-linux-v2
+          paths:
+            - build/wasm-opt
+  test-linux:
+    parameters:
+      llvm:
+        type: string
+      fmt-check:
+        type: boolean
+        default: true
+    steps:
+      - checkout
+      - submodules
+      - run:
+          name: "Install apt dependencies"
+          command: |
+            echo 'deb https://apt.llvm.org/buster/ llvm-toolchain-buster-<<parameters.llvm>> main' > /etc/apt/sources.list.d/llvm.list
+            wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
+            apt-get update
+            apt-get install --no-install-recommends -y \
+                llvm-<<parameters.llvm>>-dev \
+                clang-<<parameters.llvm>> \
+                libclang-<<parameters.llvm>>-dev \
+                lld-<<parameters.llvm>> \
+                cmake \
+                ninja-build
+      - hack-ninja-jobs
+      - build-binaryen-linux
+      - restore_cache:
+          keys:
+            - go-cache-v3-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
+            - go-cache-v3-{{ checksum "go.mod" }}
+      - llvm-source-linux
+      - run: go install -tags=llvm<<parameters.llvm>> .
+      - restore_cache:
+          keys:
+            - wasi-libc-sysroot-systemclang-v6
+      - run: make wasi-libc
+      - save_cache:
+          key: wasi-libc-sysroot-systemclang-v6
+          paths:
+            - lib/wasi-libc/sysroot
+      - when:
+          condition: <<parameters.fmt-check>>
+          steps:
+          - run:
+              # Do this before gen-device so that it doesn't check the
+              # formatting of generated files.
+              name: Check Go code formatting
+              command: make fmt-check
+      - run: make gen-device -j4
+      - run: make smoketest XTENSA=0
+      - save_cache:
+          key: go-cache-v3-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
+          paths:
+            - ~/.cache/go-build
+            - /go/pkg/mod
+
+jobs:
+  test-llvm14-go118:
+    docker:
+      - image: golang:1.18-buster
+    steps:
+      - test-linux:
+          llvm: "14"
+    resource_class: large
+  test-llvm15-go120:
+    docker:
+      - image: golang:1.20-rc-buster
+    steps:
+      - test-linux:
+          llvm: "15"
+    resource_class: large
+
+workflows:
+  test-all:
+    jobs:
+      # This tests our lowest supported versions of Go and LLVM, to make sure at
+      # least the smoke tests still pass.
+      - test-llvm14-go118
+      - test-llvm15-go120

.dockerignore

@@ -1,4 +1,3 @@
 build/
 llvm-*/
-.github
 

.github/FUNDING.yml

@@ -1,3 +0,0 @@
-# These are supported funding model platforms
-
-open_collective: tinygo

.github/workflows/build-macos.yml

@@ -14,39 +14,26 @@ concurrency:
 jobs:
   build-macos:
     name: build-macos
-    strategy:
-      matrix:
-        # macos-14: arm64 (oldest supported version as of 18-11-2025)
-        # macos-15-intel: amd64 (last intel version to be supported by github runners)
-        # See https://github.com/actions/runner-images/issues/13046
-        os: [macos-14, macos-15-intel]
-        include:
-          - os: macos-14
-            goarch: arm64
-          - os: macos-15-intel
-            goarch: amd64
-    runs-on: ${{ matrix.os }}
+    runs-on: macos-11
     steps:
       - name: Install Dependencies
+        shell: bash
         run: |
           HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v3
         with:
           submodules: true
-      - name: Extract TinyGo version
-        id: version
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM source
+        uses: actions/cache@v3
         id: cache-llvm-source
         with:
-          key: llvm-source-22-${{ matrix.os }}-v1
+          key: llvm-source-15-macos-v2
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -56,90 +43,73 @@ jobs:
       - name: Download LLVM source
         if: steps.cache-llvm-source.outputs.cache-hit != 'true'
         run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM build
+        uses: actions/cache@v3
         id: cache-llvm-build
         with:
-          key: llvm-build-22-${{ matrix.os }}-v1
+          key: llvm-build-15-macos-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+        shell: bash
         run: |
           # fetch LLVM source
           rm -rf llvm-project
           make llvm-source
           # install dependencies
-          HOMEBREW_NO_AUTO_UPDATE=1 brew install ninja
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install cmake ninja
           # build!
           make llvm-build
           find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+      - name: Cache wasi-libc sysroot
+        uses: actions/cache@v3
+        id: cache-wasi-libc
         with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
-      - name: make gen-device
-        run: make -j3 gen-device
+          key: wasi-libc-sysroot-v4
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
       - name: Test TinyGo
-        run: make test GOTESTFLAGS="-only-current-os"
+        shell: bash
+        run: make test GOTESTFLAGS="-v -short"
       - name: Build TinyGo release tarball
         run: make release -j3
       - name: Test stdlib packages
         run: make tinygo-test
       - name: Make release artifact
-        run: cp -p build/release.tar.gz build/tinygo${{ steps.version.outputs.version }}.darwin-${{ matrix.goarch }}.tar.gz
+        shell: bash
+        run: cp -p build/release.tar.gz build/tinygo.darwin-amd64.tar.gz 
       - name: Publish release artifact
-        uses: actions/upload-artifact@v7
+        # Note: this release artifact is double-zipped, see:
+        # https://github.com/actions/upload-artifact/issues/39
+        # We can essentially pick one of these:
+        # - have a double-zipped artifact when downloaded from the UI
+        # - have a very slow artifact upload
+        # We're doing the former here, to keep artifact uploads fast.
+        uses: actions/upload-artifact@v2
         with:
-          name: darwin-${{ matrix.goarch }}-double-zipped-${{ steps.version.outputs.version }}
-          path: build/tinygo${{ steps.version.outputs.version }}.darwin-${{ matrix.goarch }}.tar.gz
-          archive: false
+          name: release-double-zipped
+          path: build/tinygo.darwin-amd64.tar.gz
       - name: Smoke tests
+        shell: bash
         run: make smoketest TINYGO=$(PWD)/build/tinygo
   test-macos-homebrew:
     name: homebrew-install
     runs-on: macos-latest
-    strategy:
-      matrix:
-        version: [16, 17, 18, 19, 20]
     steps:
-      - name: Set up Homebrew
-        uses: Homebrew/actions/setup-homebrew@main
-      - name: Fix Python symlinks
-        run: |
-          # Github runners have broken symlinks, so relink
-          # see: https://github.com/actions/setup-python/issues/577
-          brew list -1 | grep python | while read formula; do brew unlink $formula; brew link --overwrite $formula; done
       - name: Install LLVM
+        shell: bash
         run: |
-          brew install llvm@${{ matrix.version }}
-          brew link llvm@${{ matrix.version }}
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install llvm@15
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v2
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
-      - name: Build TinyGo (LLVM ${{ matrix.version }})
-        run: go install -tags=llvm${{ matrix.version }}
-      - name: Check binary
-        run: tinygo version
-      - name: Build TinyGo (default LLVM)
-        if: matrix.version == 20
+      - name: Build TinyGo
         run: go install
       - name: Check binary
-        if: matrix.version == 20
         run: tinygo version

.github/workflows/compat.yml

@@ -1,72 +0,0 @@
-# This CI job checks whether at least the smoke tests pass for the oldest
-# Go/LLVM version we claim to support.
-
-name: Version compatibility test
-
-on:
-  pull_request:
-  push:
-    branches:
-      - dev
-      - release
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  test-compat:
-    runs-on: ubuntu-22.04 # this must be a specific version for the apt install below
-    env:
-      # Oldest versions currently supported by TinyGo
-      LLVM: "15"
-      Go: "1.25" # when updating this, also update minorMin in builder/config.go
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          submodules: true
-      - name: Install Go
-        uses: actions/setup-go@v6
-        with:
-          go-version: ${{ env.Go }}
-          cache: true
-      - name: Install LLVM
-        run: |
-          echo 'deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-${{ env.LLVM }} main' | sudo tee /etc/apt/sources.list.d/llvm.list
-          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo apt-get update
-          sudo apt-get install --no-install-recommends -y \
-              llvm-${{ env.LLVM }}-dev \
-              clang-${{ env.LLVM }} \
-              libclang-${{ env.LLVM }}-dev \
-              lld-${{ env.LLVM }} \
-              binaryen
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v5
-        id: cache-llvm-source
-        with:
-          key: llvm-source-22-linux-compat
-          path: llvm-project/compiler-rt
-      - name: Download LLVM source
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: llvm-project/compiler-rt
-      - name: Go cache
-        uses: actions/cache@v5
-        with:
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-          key: go-build-${{ env.Go }}-llvm${{ env.LLVM }}-${{ hashFiles('go.sum') }}
-      - name: Build TinyGo
-        run: go install -tags=llvm${{ env.LLVM }}
-      - run: tinygo version
-      - run: make gen-device -j4
-      - run: go test -tags=llvm${{ env.LLVM }} -short -skip=TestErrors
-      - run: make smoketest XTENSA=0

.github/workflows/docker.yml

@@ -19,46 +19,35 @@ jobs:
       packages: write
       contents: read
     steps:
-      - name: Free Disk space
-        shell: bash
-        run: |
-          df -h
-          sudo rm -rf /opt/hostedtoolcache
-          sudo rm -rf /usr/local/lib/android
-          sudo rm -rf /usr/share/dotnet
-          sudo rm -rf /opt/ghc
-          sudo rm -rf /usr/local/graalvm
-          sudo rm -rf /usr/local/share/boost
-          df -h
       - name: Check out the repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@v3
         with:
           submodules: recursive
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v4
+        uses: docker/setup-buildx-action@v2
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v6
+        uses: docker/metadata-action@v4
         with:
           images: |
             tinygo/tinygo-dev
-            ghcr.io/${{ github.repository_owner }}/tinygo-dev
+            ghcr.io/${{ github.repository }}/tinygo-dev
           tags: |
             type=sha,format=long
             type=raw,value=latest
       - name: Log in to Docker Hub
-        uses: docker/login-action@v4
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
       - name: Log in to Github Container Registry
-        uses: docker/login-action@v4
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
-        uses: docker/build-push-action@v7
+        uses: docker/build-push-action@v3
         with:
           context: .
           push: true
@@ -66,3 +55,35 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
+      - name: Trigger Drivers repo build on Github Actions
+        run: |
+          curl -X POST \
+          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
+          -H "Accept: application/vnd.github.v3+json" \
+          https://api.github.com/repos/tinygo-org/drivers/actions/workflows/build.yml/dispatches \
+          -d '{"ref": "dev"}'
+      - name: Trigger Bluetooth repo build on Github Actions
+        run: |
+          curl -X POST \
+          -H "Authorization: Bearer ${{secrets.GHA_ACCESS_TOKEN}}" \
+          -H "Accept: application/vnd.github.v3+json" \
+          https://api.github.com/repos/tinygo-org/bluetooth/actions/workflows/linux.yml/dispatches \
+          -d '{"ref": "dev"}'
+      - name: Trigger TinyFS repo build on CircleCI
+        run: |
+          curl --location --request POST 'https://circleci.com/api/v2/project/github/tinygo-org/tinyfs/pipeline' \
+            --header 'Content-Type: application/json' \
+            -d '{"branch": "dev"}' \
+            -u "${{ secrets.CIRCLECI_API_TOKEN }}"
+      - name: Trigger TinyFont repo build on CircleCI
+        run: |
+          curl --location --request POST 'https://circleci.com/api/v2/project/github/tinygo-org/tinyfont/pipeline' \
+            --header 'Content-Type: application/json' \
+            -d '{"branch": "dev"}' \
+            -u "${{ secrets.CIRCLECI_API_TOKEN }}"
+      - name: Trigger TinyDraw repo build on CircleCI
+        run: |
+          curl --location --request POST 'https://circleci.com/api/v2/project/github/tinygo-org/tinydraw/pipeline' \
+            --header 'Content-Type: application/json' \
+            -d '{"branch": "dev"}' \
+            -u "${{ secrets.CIRCLECI_API_TOKEN }}"

.github/workflows/linux.yml

@@ -12,61 +12,38 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  go-mod-tidy:
-    # Check that go.sum is up to date.
-    runs-on: ubuntu-slim
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          submodules: true
-      - name: Install Go
-        uses: actions/setup-go@v6
-        with:
-          go-version: '1.27.0-rc.2'
-          cache: true
-      - name: Run go mod tidy
-        run: go mod tidy
-      - name: Check go.mod and go.sum are up to date
-        run: git diff --exit-code
-
   build-linux:
     # Build Linux binaries, ready for release.
     # This runs inside an Alpine Linux container so we can more easily create a
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.27rc2-alpine
-    outputs:
-      version: ${{ steps.version.outputs.version }}
+      image: golang:1.19-alpine
     steps:
       - name: Install apk dependencies
-        # tar: needed for actions/cache@v5
+        # tar: needed for actions/cache@v3
         # git+openssh: needed for checkout (I think?)
         # ruby: needed to install fpm
-        run: apk add tar git openssh make g++ ruby-dev mold
+        run: apk add tar git openssh make g++ ruby
       - name: Work around CVE-2022-24765
         # We're not on a multi-user machine, so this is safe.
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v3
         with:
           submodules: true
-      - name: Extract TinyGo version
-        id: version
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
       - name: Cache Go
-        uses: actions/cache@v5
+        uses: actions/cache@v3
         with:
-          key: go-cache-linux-alpine-v2-${{ hashFiles('go.mod') }}
+          key: go-cache-linux-alpine-v1-${{ hashFiles('go.mod') }}
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM source
+        uses: actions/cache@v3
         id: cache-llvm-source
         with:
-          key: llvm-source-22-linux-alpine-v1
+          key: llvm-source-15-linux-alpine-v2
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -76,22 +53,11 @@ jobs:
       - name: Download LLVM source
         if: steps.cache-llvm-source.outputs.cache-hit != 'true'
         run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM build
+        uses: actions/cache@v3
         id: cache-llvm-build
         with:
-          key: llvm-build-22-linux-alpine-v1
+          key: llvm-build-15-linux-alpine-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -105,81 +71,69 @@ jobs:
           make llvm-build
           # Remove unnecessary object files (to reduce cache size).
           find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
       - name: Cache Binaryen
-        uses: actions/cache@v5
+        uses: actions/cache@v3
         id: cache-binaryen
         with:
-          key: binaryen-linux-alpine-v3
+          key: binaryen-linux-alpine-v1
           path: build/wasm-opt
       - name: Build Binaryen
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
         run: |
           apk add cmake samurai python3
           make binaryen STATIC=1
+      - name: Cache wasi-libc
+        uses: actions/cache@v3
+        id: cache-wasi-libc
+        with:
+          key: wasi-libc-sysroot-linux-alpine-v1
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
       - name: Install fpm
         run: |
           gem install --version 4.0.7 public_suffix
           gem install --version 2.7.6 dotenv
           gem install --no-document fpm
-      - name: Run linter
-        run: make lint
-      - name: Run spellcheck
-        run: make spell
       - name: Build TinyGo release
         run: |
           make release deb -j3 STATIC=1
-          cp -p build/release.tar.gz /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
-      - name: "Publish release artifact: tarball"
-        uses: actions/upload-artifact@v7
+          cp -p build/release.tar.gz /tmp/tinygo.linux-amd64.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_amd64.deb
+      - name: Publish release artifact
+        uses: actions/upload-artifact@v3
         with:
-          name: tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
-          path: /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
-          archive: false
-      - name: "Publish release artifact: Debian package"
-        uses: actions/upload-artifact@v7
-        with:
-          name: tinygo_${{ steps.version.outputs.version }}_amd64.deb
-          path: /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
-          archive: false
+          name: linux-amd64-double-zipped
+          path: |
+            /tmp/tinygo.linux-amd64.tar.gz
+            /tmp/tinygo_amd64.deb
   test-linux-build:
     # Test the binaries built in the build-linux job by running the smoke tests.
     runs-on: ubuntu-latest
     needs: build-linux
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          submodules: true
+        uses: actions/checkout@v3
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
       - name: Install wasmtime
-        uses: bytecodealliance/actions/wasmtime/setup@v1
-        with:
-          version: "29.0.1"
-      - name: Install wasm-tools
-        uses: bytecodealliance/actions/wasm-tools/setup@v1
+        run: |
+          curl https://wasmtime.dev/install.sh -sSf | bash
+          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
       - name: Download release artifact
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@v3
         with:
-          name: tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz
+          name: linux-amd64-double-zipped
       - name: Extract release tarball
         run: |
           mkdir -p ~/lib
-          tar -C ~/lib -xf tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz
+          tar -C ~/lib -xf tinygo.linux-amd64.tar.gz
           ln -s ~/lib/tinygo/bin/tinygo ~/go/bin/tinygo
-      - run: make tinygo-test-wasip1-fast
-      - run: make tinygo-test-wasip2-fast
-      - run: make tinygo-test-wasm
+      - run: make tinygo-test-wasi-fast
       - run: make smoketest
   assert-test-linux:
     # Run all tests that can run on Linux, with LLVM assertions enabled to catch
@@ -187,7 +141,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v3
         with:
           submodules: true
       - name: Install apt dependencies
@@ -202,25 +156,23 @@ jobs:
               simavr \
               ninja-build
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
       - name: Install Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v3
         with:
-          node-version: '22'
+          node-version: '14'
       - name: Install wasmtime
-        uses: bytecodealliance/actions/wasmtime/setup@v1
-        with:
-          version: "29.0.1"
-      - name: Setup `wasm-tools`
-        uses: bytecodealliance/actions/wasm-tools/setup@v1
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v5
+        run: |
+          curl https://wasmtime.dev/install.sh -sSf | bash
+          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
+      - name: Cache LLVM source
+        uses: actions/cache@v3
         id: cache-llvm-source
         with:
-          key: llvm-source-22-linux-asserts-v1
+          key: llvm-source-15-linux-asserts-v2
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -230,22 +182,11 @@ jobs:
       - name: Download LLVM source
         if: steps.cache-llvm-source.outputs.cache-hit != 'true'
         run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM build
+        uses: actions/cache@v3
         id: cache-llvm-build
         with:
-          key: llvm-build-22-linux-asserts-v1
+          key: llvm-build-15-linux-asserts-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -257,14 +198,8 @@ jobs:
           make llvm-build ASSERT=1
           # Remove unnecessary object files (to reduce cache size).
           find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
       - name: Cache Binaryen
-        uses: actions/cache@v5
+        uses: actions/cache@v3
         id: cache-binaryen
         with:
           key: binaryen-linux-asserts-v1
@@ -272,6 +207,15 @@ jobs:
       - name: Build Binaryen
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
         run: make binaryen
+      - name: Cache wasi-libc
+        uses: actions/cache@v3
+        id: cache-wasi-libc
+        with:
+          key: wasi-libc-sysroot-linux-asserts-v5
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
       - run: make gen-device -j4
       - name: Test TinyGo
         run: make ASSERT=1 test
@@ -283,10 +227,8 @@ jobs:
         run: make tinygo-test
       - run: make smoketest
       - run: make wasmtest
-      - run: make tinygo-test-baremetal
-      - name: Check Go code formatting
-        run: make fmt-check lint
-  build-linux-cross:
+      - run: make tinygo-baremetal
+  build-linux-arm:
     # Build ARM Linux binaries, ready for release.
     # This intentionally uses an older Linux image, so that we compile against
     # an older glibc version and therefore are compatible with a wide range of
@@ -295,41 +237,28 @@ jobs:
     # in that process to avoid doing lots of duplicate work and to avoid
     # complications around precompiled libraries such as compiler-rt shipped as
     # part of the release tarball.
-    strategy:
-      matrix:
-        goarch: [ arm, arm64 ]
-        include:
-          - goarch: arm64
-            toolchain: aarch64-linux-gnu
-            libc: arm64
-          - goarch: arm
-            toolchain: arm-linux-gnueabihf
-            libc: armhf
-    runs-on: ubuntu-22.04 # note: use the oldest image available! (see above)
+    runs-on: ubuntu-18.04
     needs: build-linux
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
-      - name: Get TinyGo version
-        id: version
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
+        uses: actions/checkout@v3
       - name: Install apt dependencies
         run: |
           sudo apt-get update
           sudo apt-get install --no-install-recommends \
               qemu-user \
-              g++-${{ matrix.toolchain }} \
-              libc6-dev-${{ matrix.libc }}-cross
+              g++-arm-linux-gnueabihf \
+              libc6-dev-armhf-cross
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM source
+        uses: actions/cache@v3
         id: cache-llvm-source
         with:
-          key: llvm-source-22-linux-v1
+          key: llvm-source-15-linux-v2
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -339,22 +268,11 @@ jobs:
       - name: Download LLVM source
         if: steps.cache-llvm-source.outputs.cache-hit != 'true'
         run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM build
+        uses: actions/cache@v3
         id: cache-llvm-build
         with:
-          key: llvm-build-22-linux-${{ matrix.goarch }}-v1
+          key: llvm-build-15-linux-arm-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -365,27 +283,21 @@ jobs:
           # Install build dependencies.
           sudo apt-get install --no-install-recommends ninja-build
           # build!
-          make llvm-build CROSS=${{ matrix.toolchain }}
+          make llvm-build CROSS=arm-linux-gnueabihf
           # Remove unnecessary object files (to reduce cache size).
           find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save LLVM build cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
       - name: Cache Binaryen
-        uses: actions/cache@v5
+        uses: actions/cache@v3
         id: cache-binaryen
         with:
-          key: binaryen-linux-${{ matrix.goarch }}-v5
+          key: binaryen-linux-arm-v1
           path: build/wasm-opt
       - name: Build Binaryen
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
         run: |
           sudo apt-get install --no-install-recommends ninja-build
           git submodule update --init lib/binaryen
-          make CROSS=${{ matrix.toolchain }} binaryen
+          make CROSS=arm-linux-gnueabihf binaryen
       - name: Install fpm
         run: |
           sudo gem install --version 4.0.7 public_suffix
@@ -393,33 +305,125 @@ jobs:
           sudo gem install --no-document fpm
       - name: Build TinyGo binary
         run: |
-          make CROSS=${{ matrix.toolchain }}
+          make CROSS=arm-linux-gnueabihf
       - name: Download amd64 release
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@v3
         with:
-          name: tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz
+          name: linux-amd64-double-zipped
       - name: Extract amd64 release
         run: |
           mkdir -p build/release
-          tar -xf tinygo${{ needs.build-linux.outputs.version }}.linux-amd64.tar.gz -C build/release tinygo
+          tar -xf tinygo.linux-amd64.tar.gz -C build/release tinygo
       - name: Modify release
         run: |
           cp -p build/tinygo   build/release/tinygo/bin
           cp -p build/wasm-opt build/release/tinygo/bin
-      - name: Create ${{ matrix.goarch }} release
+      - name: Create arm release
         run: |
-          make release deb RELEASEONLY=1 DEB_ARCH=${{ matrix.libc }}
-          cp -p build/release.tar.gz /tmp/tinygo${{ needs.build-linux.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_${{ needs.build-linux.outputs.version }}_${{ matrix.libc }}.deb
-      - name: "Publish release artifact: tarball"
-        uses: actions/upload-artifact@v7
+          make release deb RELEASEONLY=1 DEB_ARCH=armhf
+          cp -p build/release.tar.gz /tmp/tinygo.linux-arm.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_armhf.deb
+      - name: Publish release artifact
+        uses: actions/upload-artifact@v3
         with:
-          name: linux-${{ matrix.goarch }}-double-zipped-${{ needs.build-linux.outputs.version }}
-          path: /tmp/tinygo${{ needs.build-linux.outputs.version }}.linux-${{ matrix.goarch }}.tar.gz
-          archive: false
-      - name: "Publish release artifact: Debian package"
-        uses: actions/upload-artifact@v7
+          name: linux-arm-double-zipped
+          path: |
+            /tmp/tinygo.linux-arm.tar.gz
+            /tmp/tinygo_armhf.deb
+  build-linux-arm64:
+    # Build ARM64 Linux binaries, ready for release.
+    # It is set to "needs: build-linux" because it modifies the release created
+    # in that process to avoid doing lots of duplicate work and to avoid
+    # complications around precompiled libraries such as compiler-rt shipped as
+    # part of the release tarball.
+    runs-on: ubuntu-18.04
+    needs: build-linux
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install apt dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends \
+              qemu-user \
+              g++-aarch64-linux-gnu \
+              libc6-dev-arm64-cross \
+              ninja-build
+      - name: Install Go
+        uses: actions/setup-go@v3
         with:
-          name: linux-${{ matrix.goarch }}-double-zipped-${{ needs.build-linux.outputs.version }}
-          path: /tmp/tinygo_${{ needs.build-linux.outputs.version }}_${{ matrix.libc }}.deb
-          archive: false
+          go-version: '1.19'
+          cache: true
+      - name: Cache LLVM source
+        uses: actions/cache@v3
+        id: cache-llvm-source
+        with:
+          key: llvm-source-15-linux-v2
+          path: |
+            llvm-project/clang/lib/Headers
+            llvm-project/clang/include
+            llvm-project/compiler-rt
+            llvm-project/lld/include
+            llvm-project/llvm/include
+      - name: Download LLVM source
+        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
+        run: make llvm-source
+      - name: Cache LLVM build
+        uses: actions/cache@v3
+        id: cache-llvm-build
+        with:
+          key: llvm-build-15-linux-arm64-v2
+          path: llvm-build
+      - name: Build LLVM
+        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+        run: |
+          # fetch LLVM source
+          rm -rf llvm-project
+          make llvm-source
+          # build!
+          make llvm-build CROSS=aarch64-linux-gnu
+          # Remove unnecessary object files (to reduce cache size).
+          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
+      - name: Cache Binaryen
+        uses: actions/cache@v3
+        id: cache-binaryen
+        with:
+          key: binaryen-linux-arm64-v1
+          path: build/wasm-opt
+      - name: Build Binaryen
+        if: steps.cache-binaryen.outputs.cache-hit != 'true'
+        run: |
+          git submodule update --init lib/binaryen
+          make CROSS=aarch64-linux-gnu binaryen
+      - name: Install fpm
+        run: |
+          sudo gem install --version 4.0.7 public_suffix
+          sudo gem install --version 2.7.6 dotenv
+          sudo gem install --no-document fpm
+      - name: Build TinyGo binary
+        run: |
+          make CROSS=aarch64-linux-gnu
+      - name: Download amd64 release
+        uses: actions/download-artifact@v3
+        with:
+          name: linux-amd64-double-zipped
+      - name: Extract amd64 release
+        run: |
+          mkdir -p build/release
+          tar -xf tinygo.linux-amd64.tar.gz -C build/release tinygo
+      - name: Modify release
+        run: |
+          cp -p build/tinygo   build/release/tinygo/bin
+          cp -p build/wasm-opt build/release/tinygo/bin
+      - name: Create arm64 release
+        run: |
+          make release deb RELEASEONLY=1 DEB_ARCH=arm64
+          cp -p build/release.tar.gz /tmp/tinygo.linux-arm64.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_arm64.deb
+      - name: Publish release artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: linux-arm64-double-zipped
+          path: |
+            /tmp/tinygo.linux-arm64.tar.gz
+            /tmp/tinygo_arm64.deb

.github/workflows/llvm.yml

@@ -1,63 +0,0 @@
-# This is the Github action to build and push the LLVM Docker image
-# used by the tinygo/tinygo-dev Docker image.
-#
-# It only needs to be rebuilt when updating the LLVM version.
-#
-# To update, make any needed changes to this file,
-# then push to the "build-llvm-image" branch.
-#
-# The needed image will be rebuilt, which will very likely take at least 1-2 hours.
-name: LLVM
-on:
-  push:
-    branches: [ build-llvm-image ]
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build-push-llvm:
-    name: build-push-llvm
-    runs-on: ubuntu-latest
-    permissions:
-      packages: write
-      contents: read
-    steps:
-      - name: Check out the repo
-        uses: actions/checkout@v6
-        with:
-          submodules: recursive
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v4
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v6
-        with:
-          images: |
-            tinygo/llvm-20
-            ghcr.io/${{ github.repository_owner }}/llvm-20
-          tags: |
-            type=sha,format=long
-            type=raw,value=latest
-      - name: Log in to Docker Hub
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-      - name: Log in to Github Container Registry
-        uses: docker/login-action@v4
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push
-        uses: docker/build-push-action@v7
-        with:
-          target: tinygo-llvm-build
-          context: .
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max

.github/workflows/nix.yml

@@ -1,48 +0,0 @@
-name: Nix
-
-on:
-  pull_request:
-  push:
-    branches:
-      - dev
-      - release
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  nix-test:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Uninstall system LLVM
-        # Hack to work around issue where we still include system headers for
-        # some reason.
-        # See: https://github.com/tinygo-org/tinygo/pull/4516#issuecomment-2416363668
-        run: sudo apt-get remove llvm-18
-      - name: Checkout
-        uses: actions/checkout@v6
-      - name: Pull musl, bdwgc
-        run: |
-            git submodule update --init lib/musl lib/bdwgc
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v5
-        id: cache-llvm-source
-        with:
-          key: llvm-source-22-linux-nix-v1
-          path: |
-            llvm-project/compiler-rt
-      - name: Download LLVM source
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        run: make llvm-source
-      - name: Save LLVM source cache
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/compiler-rt
-      - uses: cachix/install-nix-action@v31
-      - name: Test
-        run: |
-          nix develop --ignore-environment --keep HOME --command bash -c "go install && ~/go/bin/tinygo version && ~/go/bin/tinygo build -o test ./testdata/cgo"

.github/workflows/sizediff-install-pkgs.sh

@@ -1,12 +0,0 @@
-# Command that's part of sizediff.yml. This is put in a separate file so that it
-# still works after checking out the dev branch (that is, when going from LLVM
-# 16 to LLVM 17 for example, both Clang 16 and Clang 17 are installed).
-
-echo 'deb https://apt.llvm.org/noble/ llvm-toolchain-noble-20 main' | sudo tee /etc/apt/sources.list.d/llvm.list
-wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-sudo apt-get update
-sudo apt-get install --no-install-recommends -y \
-    llvm-20-dev \
-    clang-20 \
-    libclang-20-dev \
-    lld-20

.github/workflows/sizediff.yml

@@ -1,97 +0,0 @@
-name: Binary size difference
-
-on:
-  pull_request:
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  sizediff:
-    # Note: when updating the Ubuntu version, also update the Ubuntu version in
-    # sizediff-install-pkgs.sh
-    runs-on: ubuntu-24.04
-    permissions:
-      pull-requests: write
-    steps:
-      # Prepare, install tools
-      - name: Add GOBIN to $PATH
-        run: |
-          echo "$HOME/go/bin" >> $GITHUB_PATH
-      - name: Install Go
-        uses: actions/setup-go@v6
-        with:
-          go-version: '~1.25'
-      - name: Checkout
-        uses: actions/checkout@v6
-        with:
-          fetch-depth: 0 # fetch all history (no sparse checkout)
-          submodules: true
-      - name: Install apt dependencies
-        run: ./.github/workflows/sizediff-install-pkgs.sh
-      - name: Restore LLVM source cache
-        uses: actions/cache@v5
-        id: cache-llvm-source
-        with:
-          key: llvm-source-22-sizediff-v1
-          path: |
-            llvm-project/compiler-rt
-      - name: Download LLVM source
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        run: make llvm-source
-      - name: Cache Go
-        uses: actions/cache@v5
-        with:
-          key: go-cache-linux-sizediff-v2-${{ hashFiles('go.mod') }}
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-      - run: make gen-device -j4
-      - name: Download drivers repo
-        run: git clone https://github.com/tinygo-org/drivers.git
-      - name: Save HEAD
-        run: git branch github-actions-saved-HEAD HEAD
-
-      # Compute sizes for the PR branch
-      - name: Build tinygo binary for the PR branch
-        run: go install
-      - name: Determine binary sizes on the PR branch
-        run: (cd drivers; make smoke-test XTENSA=0 | tee sizes-pr.txt)
-
-      # Compute sizes for the dev branch
-      - name: Checkout dev branch
-        run: |
-          git reset --hard origin/dev
-          git checkout --no-recurse-submodules `git merge-base HEAD origin/dev`
-      - name: Install apt dependencies on the dev branch
-        # this is only needed on a PR that changes the LLVM version
-        run: ./.github/workflows/sizediff-install-pkgs.sh
-      - name: Build tinygo binary for the dev branch
-        run: go install
-      - name: Determine binary sizes on the dev branch
-        run: (cd drivers; make smoke-test XTENSA=0 | tee sizes-dev.txt)
-
-      # Create comment
-      # TODO: add a summary, something like:
-      #  - overall size difference (percent)
-      #  - number of binaries that grew / shrank / remained the same
-      #  - don't show the full diff when no binaries changed
-      - name: Calculate size diff
-        run: ./tools/sizediff drivers/sizes-dev.txt drivers/sizes-pr.txt | tee sizediff.txt
-      - name: Create comment
-        run: |
-          echo "Size difference with the dev branch:" > comment.txt
-          echo "<details><summary>Binary size difference</summary>" >> comment.txt
-          echo "<pre>" >> comment.txt
-          cat sizediff.txt >> comment.txt
-          echo "</pre></details>" >> comment.txt
-      - name: Comment contents
-        run: cat comment.txt
-      - name: Add comment
-        if: ${{ github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name }}
-        uses: thollander/actions-comment-pull-request@v2.3.1
-        with:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          filePath: comment.txt
-          comment_tag: sizediff

.github/workflows/tinygo-extract-version.sh

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-# Extract the version string from the source code, to be stored in a variable.
-grep 'const version' goenv/version.go | sed 's/^const version = "\(.*\)"$/version=\1/g'

.github/workflows/windows.yml

@@ -14,33 +14,28 @@ concurrency:
 jobs:
   build-windows:
     runs-on: windows-2022
-    outputs:
-      version: ${{ steps.version.outputs.version }}
     steps:
-      - uses: MinoruSekine/setup-scoop@v4
+      - uses: brechtm/setup-scoop@v2
+        with:
+          scoop_update: 'false'
       - name: Install Dependencies
         shell: bash
         run: |
-          scoop config use_external_7zip true
           scoop install ninja binaryen
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v3
         with:
           submodules: true
-      - name: Extract TinyGo version
-        id: version
-        shell: bash
-        run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
-      - name: Restore cached LLVM source
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM source
+        uses: actions/cache@v3
         id: cache-llvm-source
         with:
-          key: llvm-source-22-windows-v3
+          key: llvm-source-15-windows-v2
           path: |
             llvm-project/clang/lib/Headers
             llvm-project/clang/include
@@ -50,22 +45,11 @@ jobs:
       - name: Download LLVM source
         if: steps.cache-llvm-source.outputs.cache-hit != 'true'
         run: make llvm-source
-      - name: Save cached LLVM source
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
-          path: |
-            llvm-project/clang/lib/Headers
-            llvm-project/clang/include
-            llvm-project/compiler-rt
-            llvm-project/lld/include
-            llvm-project/llvm/include
-      - name: Restore cached LLVM build
-        uses: actions/cache/restore@v5
+      - name: Cache LLVM build
+        uses: actions/cache@v3
         id: cache-llvm-build
         with:
-          key: llvm-build-22-windows-v1
+          key: llvm-build-15-windows-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -78,65 +62,67 @@ jobs:
           make llvm-build CCACHE=OFF
           # Remove unnecessary object files (to reduce cache size).
           find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
-      - name: Save cached LLVM build
-        uses: actions/cache/save@v5
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
+      - name: Cache wasi-libc sysroot
+        uses: actions/cache@v3
+        id: cache-wasi-libc
         with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
-      - name: Cache Go cache
-        uses: actions/cache@v5
-        with:
-          key: go-cache-windows-v3-${{ hashFiles('go.mod') }}
-          path: |
-            C:/Users/runneradmin/AppData/Local/go-build
-            C:/Users/runneradmin/go/pkg/mod
+          key: wasi-libc-sysroot-v4
+          path: lib/wasi-libc/sysroot
+      - name: Build wasi-libc
+        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
+        run: make wasi-libc
       - name: Install wasmtime
         run: |
-          scoop config use_external_7zip true
-          scoop install wasmtime@29.0.1
-      - name: make gen-device
-        run: make -j3 gen-device
+          scoop install wasmtime
       - name: Test TinyGo
         shell: bash
-        run: make test GOTESTFLAGS="-only-current-os"
+        run: make test GOTESTFLAGS="-v -short"
       - name: Build TinyGo release tarball
         shell: bash
         run: make build/release -j4
       - name: Make release artifact
         shell: bash
         working-directory: build/release
-        run: 7z -tzip a tinygo${{ steps.version.outputs.version }}.windows-amd64.zip tinygo
+        run: 7z -tzip a release.zip tinygo
       - name: Publish release artifact
-        uses: actions/upload-artifact@v7
+        # Note: this release artifact is double-zipped, see:
+        # https://github.com/actions/upload-artifact/issues/39
+        # We can essentially pick one of these:
+        # - have a dobule-zipped artifact when downloaded from the UI
+        # - have a very slow artifact upload
+        # We're doing the former here, to keep artifact uploads fast.
+        uses: actions/upload-artifact@v3
         with:
-          name: tinygo${{ steps.version.outputs.version }}.windows-amd64.zip
-          path: build/release/tinygo${{ steps.version.outputs.version }}.windows-amd64.zip
-          archive: false
+          name: release-double-zipped
+          path: build/release/release.zip
 
   smoke-test-windows:
     runs-on: windows-2022
     needs: build-windows
     steps:
-      - uses: MinoruSekine/setup-scoop@v4
+      - uses: brechtm/setup-scoop@v2
+        with:
+          scoop_update: 'false'
       - name: Install Dependencies
         shell: bash
         run: |
-          scoop config use_external_7zip true
           scoop install binaryen
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v2
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
       - name: Download TinyGo build
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@v2
         with:
-          name: tinygo${{ needs.build-windows.outputs.version }}.windows-amd64.zip
+          name: release-double-zipped
           path: build/
-        # This build is already unzipped.
+      - name: Unzip TinyGo build
+        shell: bash
+        working-directory: build
+        run: 7z x release.zip -r
       - name: Smoke tests
         shell: bash
         run: make smoketest TINYGO=$(PWD)/build/tinygo/bin/tinygo
@@ -146,18 +132,21 @@ jobs:
     needs: build-windows
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v2
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
       - name: Download TinyGo build
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@v2
         with:
-          name: tinygo${{ needs.build-windows.outputs.version }}.windows-amd64.zip
+          name: release-double-zipped
           path: build/
-        # This build is already unzipped.
+      - name: Unzip TinyGo build
+        shell: bash
+        working-directory: build
+        run: 7z x release.zip -r
       - name: Test stdlib packages
         run: make tinygo-test TINYGO=$(PWD)/build/tinygo/bin/tinygo
 
@@ -165,24 +154,28 @@ jobs:
     runs-on: windows-2022
     needs: build-windows
     steps:
-      - uses: MinoruSekine/setup-scoop@v4
+      - uses: brechtm/setup-scoop@v2
+        with:
+          scoop_update: 'false'
       - name: Install Dependencies
         shell: bash
         run: |
-          scoop config use_external_7zip true
-          scoop install binaryen wasmtime@29.0.1
+          scoop install binaryen wasmtime
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v2
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.27.0-rc.2'
+          go-version: '1.19'
           cache: true
       - name: Download TinyGo build
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@v2
         with:
-          name: tinygo${{ needs.build-windows.outputs.version }}.windows-amd64.zip
+          name: release-double-zipped
           path: build/
-        # This build is already unzipped.
-      - name: Test stdlib packages on wasip1
-        run: make tinygo-test-wasip1-fast TINYGO=$(PWD)/build/tinygo/bin/tinygo
+      - name: Unzip TinyGo build
+        shell: bash
+        working-directory: build
+        run: 7z x release.zip -r
+      - name: Test stdlib packages on wasi
+        run: make tinygo-test-wasi-fast TINYGO=$(PWD)/build/tinygo/bin/tinygo

.gitignore

@@ -1,8 +1,3 @@
-.DS_Store
-.vscode
-go.work
-go.work.sum
-
 docs/_build
 src/device/avr/*.go
 src/device/avr/*.ld
@@ -20,11 +15,9 @@ src/device/stm32/*.go
 src/device/stm32/*.s
 src/device/kendryte/*.go
 src/device/kendryte/*.s
-src/device/renesas/*.go
-src/device/renesas/*.s
 src/device/rp/*.go
 src/device/rp/*.s
-./vendor
+vendor
 llvm-build
 llvm-project
 build/*
@@ -37,9 +30,5 @@ test.exe
 test.gba
 test.hex
 test.nro
-test.uf2
 test.wasm
 wasm.wasm
-
-*.uf2
-*.elf

.gitmodules

@@ -9,20 +9,19 @@
 	url = https://github.com/avr-rust/avr-mcu.git
 [submodule "lib/cmsis-svd"]
 	path = lib/cmsis-svd
-	url = https://github.com/cmsis-svd/cmsis-svd-data.git
-	branch = main
+	url = https://github.com/tinygo-org/cmsis-svd
 [submodule "lib/wasi-libc"]
 	path = lib/wasi-libc
-	url = https://github.com/WebAssembly/wasi-libc
+	url = https://github.com/CraneStation/wasi-libc
 [submodule "lib/picolibc"]
 	path = lib/picolibc
-	url = https://github.com/picolibc/picolibc.git
+	url = https://github.com/keith-packard/picolibc.git
 [submodule "lib/stm32-svd"]
 	path = lib/stm32-svd
 	url = https://github.com/tinygo-org/stm32-svd
 [submodule "lib/musl"]
 	path = lib/musl
-	url = https://github.com/tinygo-org/musl-libc.git
+	url = git://git.musl-libc.org/musl
 [submodule "lib/binaryen"]
 	path = lib/binaryen
 	url = https://github.com/WebAssembly/binaryen.git
@@ -32,12 +31,3 @@
 [submodule "lib/macos-minimal-sdk"]
 	path = lib/macos-minimal-sdk
 	url = https://github.com/aykevl/macos-minimal-sdk.git
-[submodule "src/net"]
-	path = src/net
-	url = https://github.com/tinygo-org/net.git
-[submodule "lib/wasi-cli"]
-	path = lib/wasi-cli
-	url = https://github.com/WebAssembly/wasi-cli
-[submodule "lib/bdwgc"]
-	path = lib/bdwgc
-	url = https://github.com/ivmai/bdwgc.git

BUILDING.md

@@ -18,8 +18,7 @@ tarball. If you want to help with development of TinyGo itself, you should follo
 LLVM, Clang and LLD are quite light on dependencies, requiring only standard
 build tools to be built. Go is of course necessary to build TinyGo itself.
 
-  * Go (1.19+)
-  * GNU Make
+  * Go (1.18+)
   * Standard build tools (gcc/clang)
   * git
   * CMake
@@ -28,21 +27,6 @@ build tools to be built. Go is of course necessary to build TinyGo itself.
 The rest of this guide assumes you're running Linux, but it should be equivalent
 on a different system like Mac.
 
-## Using GNU Make
-
-The static build of TinyGo is driven by GNUmakefile, which provides a help target for quick reference:
-
-    % make help
-    clean                           Remove build directory
-    fmt                             Reformat source
-    fmt-check                       Warn if any source needs reformatting
-    gen-device                      Generate microcontroller-specific sources
-    llvm-source                     Get LLVM sources
-    llvm-build                      Build LLVM
-    tinygo                          Build the TinyGo compiler
-    lint                            Lint source tree
-    spell                           Spellcheck source tree
-
 ## Download the source
 
 The first step is to download the TinyGo sources (use `--recursive` if you clone
@@ -85,17 +69,11 @@ Try running TinyGo:
 
     ./build/tinygo help
 
-Also, make sure the `tinygo` binary really is statically linked. The command to check for 
-dynamic dependencies differs depending on your operating system.
-
-On Linux, use `ldd` (not to be confused with `lld`):
+Also, make sure the `tinygo` binary really is statically linked. Check this
+using `ldd` (not to be confused with `lld`):
 
     ldd ./build/tinygo
 
-On macOS, use otool -L:
-
-    otool -L ./build/tinygo
-
 The result should not contain libclang or libLLVM.
 
 ## Make a release tarball

Dockerfile

@@ -1,15 +1,10 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.27rc2 AS tinygo-llvm
+FROM golang:1.19 AS tinygo-llvm
 
 RUN apt-get update && \
-    apt-get install -y apt-utils make cmake clang-17 ninja-build && \
-    rm -rf \
-        /var/lib/apt/lists/* \
-        /var/log/* \
-        /var/tmp/* \
-        /tmp/*
+    apt-get install -y apt-utils make cmake clang-11 ninja-build
 
-COPY ./GNUmakefile /tinygo/GNUmakefile
+COPY ./Makefile /tinygo/Makefile
 
 RUN cd /tinygo/ && \
     make llvm-source
@@ -20,24 +15,26 @@ FROM tinygo-llvm AS tinygo-llvm-build
 RUN cd /tinygo/ && \
     make llvm-build
 
-# tinygo-compiler-build stage builds the compiler itself
-FROM tinygo-llvm-build AS tinygo-compiler-build
+# tinygo-compiler stage builds the compiler itself
+FROM tinygo-llvm-build AS tinygo-compiler
 
 COPY . /tinygo
 
-# build the compiler and tools
+# update submodules
 RUN cd /tinygo/ && \
-    git submodule update --init && \
+    rm -rf ./lib/*/ && \
+    git submodule sync && \
+    git submodule update --init --recursive --force
+
+RUN cd /tinygo/ && \
+    make
+
+# tinygo-tools stage installs the needed dependencies to compile TinyGo programs for all platforms.
+FROM tinygo-compiler AS tinygo-tools
+
+RUN cd /tinygo/ && \
+    make wasi-libc binaryen && \
     make gen-device -j4 && \
-    make build/release
+    cp build/* $GOPATH/bin/
 
-# tinygo-compiler copies the compiler build over to a base Go container (without
-# all the build tools etc).
-FROM golang:1.27rc2 AS tinygo-compiler
-
-# Copy tinygo build.
-COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo
-
-# Configure the container.
-ENV PATH="${PATH}:/tinygo/bin"
 CMD ["tinygo"]

GOVERNANCE.md

@@ -1,32 +0,0 @@
-TinyGo Team Members
-===================
-
-The team of humans who maintain TinyGo.
-
-*   **Purpose**: To maintain the community, code, documentation, and tools for the TinyGo compiler.
-*   **Board**: The group of people who share responsibility for key decisions for the TinyGo organization.  
-    *   **Majority Voting**: The board makes decisions by majority vote.
-    *   **Membership**: The board elects its own members.
-*   **Do-ocracy**: Those who step forward to do a given task propose how it should be done. Then other interested people can make comments.
-*   **Proof of Work**: Power in decision-making is slightly weighted based on a participant's labor for the community.
-*   **Initiation**: We need to establish a procedure for how people join the team of maintainers.
-*   **Transparency**: Important information should be made publicly available, ideally in a way that allows for public comment.
-*   **Code of Conduct**: Participants agree to abide by the current project Code of Conduct.
-
-## Members
-
-* Ayke van Laethem (@aykevl)
-* Daniel Esteban (@conejoninja)
-* Ron Evans (@deadprogram)
-* Damian Gryski (@dgryski)
-* Masaaki Takasago (@sago35)
-* Patricio Whittingslow (@soypat)
-* Yurii Soldak (@ysoldak)
-
-## Experimental
-
-*   **Monthly Meeting**: A monthly meeting for the team and any other interested participants.  
-    Duration: 1 hour  
-    Facilitation: @deadprogram
-    Schedule: See https://github.com/tinygo-org/tinygo/wiki/Meetings for more information
-

LICENSE

@@ -1,8 +1,7 @@
-Copyright (c) 2018-2026 The TinyGo Authors. All rights reserved.
+Copyright (c) 2018-2022 The TinyGo Authors. All rights reserved.
 
 TinyGo includes portions of the Go standard library.
-Copyright 2009 The Go Authors. All rights reserved.
-See https://github.com/golang/go/blob/master/LICENSE for license information.
+Copyright (c) 2009-2022 The Go Authors. All rights reserved.
 
 TinyGo includes portions of LLVM, which is under the Apache License v2.0 with
 LLVM Exceptions. See https://llvm.org/LICENSE.txt for license information.

README.md

@@ -1,16 +1,11 @@
 # TinyGo - Go compiler for small places
 
-[![Linux](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml) [![macOS](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml) [![Windows](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml) [![Docker](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml) [![Nix](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/nix.yml)
+[![Linux](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/linux.yml) [![macOS](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/build-macos.yml) [![Windows](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/windows.yml) [![Docker](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml/badge.svg?branch=dev)](https://github.com/tinygo-org/tinygo/actions/workflows/docker.yml) [![CircleCI](https://circleci.com/gh/tinygo-org/tinygo/tree/dev.svg?style=svg)](https://circleci.com/gh/tinygo-org/tinygo/tree/dev)
 
-TinyGo is a Go compiler intended for use in small places such as microcontrollers, WebAssembly (wasm/wasi), and command-line tools.
+TinyGo is a Go compiler intended for use in small places such as microcontrollers, WebAssembly (Wasm), and command-line tools.
 
 It reuses libraries used by the [Go language tools](https://golang.org/pkg/go/) alongside [LLVM](http://llvm.org) to provide an alternative way to compile programs written in the Go programming language.
 
-> [!IMPORTANT]
-> You can help TinyGo with a financial contribution using OpenCollective. Please see https://opencollective.com/tinygo for more information. Thank you!
-
-## Embedded
-
 Here is an example program that blinks the built-in LED when run directly on any supported board with onboard LED:
 
 ```go
@@ -34,70 +29,121 @@ func main() {
 }
 ```
 
-The above program can be compiled and run without modification on an [Arduino Uno](https://tinygo.org/docs/reference/microcontrollers/boards/arduino-uno), an [Adafruit Circuit Playground Express](https://tinygo.org/docs/reference/microcontrollers/featured/circuitplay-express), a [Seeed Studio XIAO-ESP32S3](https://tinygo.org/docs/reference/microcontrollers/featured/xiao-esp32s3) or any of the many supported boards that have a built-in LED, just by setting the correct TinyGo compiler target. For example, this compiles and flashes an Arduino Uno:
+The above program can be compiled and run without modification on an Arduino Uno, an Adafruit ItsyBitsy M0, or any of the supported boards that have a built-in LED, just by setting the correct TinyGo compiler target. For example, this compiles and flashes an Arduino Uno:
 
 ```shell
-tinygo flash -target arduino-uno examples/blinky1
-```
-
-## WebAssembly
-
-TinyGo is very useful for compiling programs both for use in browsers (WASM) as well as for use on servers and other edge devices (WASI).
-
-TinyGo programs can run in [Fastly Compute](https://www.fastly.com/documentation/guides/compute/go/), [Fermyon Spin](https://developer.fermyon.com/spin/go-components), [wazero](https://wazero.io/languages/tinygo/) and many other WebAssembly runtimes.
-
-Here is a small TinyGo program for use by a WASI host application:
-
-```go
-package main
-
-//go:wasmexport add
-func add(x, y uint32) uint32 {
-	return x + y
-}
-```
-
-This compiles the above TinyGo program for use on any WASI Preview 1 runtime:
-
-```shell
-tinygo build -buildmode=c-shared -o add.wasm -target=wasip1 add.go
-```
-
-You can also use the same syntax as Go 1.24+:
-
-```shell
-GOOS=wasip1 GOARCH=wasm tinygo build -buildmode=c-shared -o add.wasm add.go
+tinygo flash -target arduino examples/blinky1
 ```
 
 ## Installation
 
 See the [getting started instructions](https://tinygo.org/getting-started/) for information on how to install TinyGo, as well as how to run the TinyGo compiler using our Docker container.
 
-## Supported targets
+## Supported boards/targets
 
-### Embedded
+You can compile TinyGo programs for microcontrollers, WebAssembly and Linux.
 
-You can compile TinyGo programs for over 150 different microcontroller boards.
+The following 94 microcontroller boards are currently supported:
 
-For more information, please see https://tinygo.org/docs/reference/microcontrollers/
+* [Adafruit Circuit Playground Bluefruit](https://www.adafruit.com/product/4333)
+* [Adafruit Circuit Playground Express](https://www.adafruit.com/product/3333)
+* [Adafruit CLUE](https://www.adafruit.com/product/4500)
+* [Adafruit Feather M0](https://www.adafruit.com/product/2772)
+* [Adafruit Feather M0 Express](https://www.adafruit.com/product/3403)
+* [Adafruit Feather M4](https://www.adafruit.com/product/3857)
+* [Adafruit Feather M4 CAN](https://www.adafruit.com/product/4759)
+* [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062)
+* [Adafruit Feather nRF52840 Sense](https://www.adafruit.com/product/4516)
+* [Adafruit Feather RP2040](https://www.adafruit.com/product/4884)
+* [Adafruit Feather STM32F405 Express](https://www.adafruit.com/product/4382)
+* [Adafruit Grand Central M4](https://www.adafruit.com/product/4064)
+* [Adafruit ItsyBitsy M0](https://www.adafruit.com/product/3727)
+* [Adafruit ItsyBitsy M4](https://www.adafruit.com/product/3800)
+* [Adafruit ItsyBitsy nRF52840](https://www.adafruit.com/product/4481)
+* [Adafruit KB2040](https://www.adafruit.com/product/5302)
+* [Adafruit MacroPad RP2040](https://www.adafruit.com/product/5100)
+* [Adafruit Matrix Portal M4](https://www.adafruit.com/product/4745)
+* [Adafruit Metro M4 Express Airlift](https://www.adafruit.com/product/4000)
+* [Adafruit PyBadge](https://www.adafruit.com/product/4200)
+* [Adafruit PyGamer](https://www.adafruit.com/product/4242)
+* [Adafruit PyPortal](https://www.adafruit.com/product/4116)
+* [Adafruit QT Py](https://www.adafruit.com/product/4600)
+* [Adafruit QT Py RP2040](https://www.adafruit.com/product/4900)
+* [Adafruit Trinket M0](https://www.adafruit.com/product/3500)
+* [Adafruit Trinkey QT2040](https://adafruit.com/product/5056)
+* [Arduino Mega 1280](https://www.arduino.cc/en/Main/arduinoBoardMega/)
+* [Arduino Mega 2560](https://store.arduino.cc/arduino-mega-2560-rev3)
+* [Arduino MKR1000](https://store.arduino.cc/arduino-mkr1000-wifi)
+* [Arduino MKR WiFi 1010](https://store.arduino.cc/usa/mkr-wifi-1010)
+* [Arduino Nano](https://store.arduino.cc/arduino-nano)
+* [Arduino Nano 33 BLE](https://store.arduino.cc/nano-33-ble)
+* [Arduino Nano 33 BLE Sense](https://store.arduino.cc/nano-33-ble-sense)
+* [Arduino Nano 33 IoT](https://store.arduino.cc/nano-33-iot)
+* [Arduino Nano RP2040 Connect](https://store.arduino.cc/nano-rp2040-connect)
+* [Arduino Uno](https://store.arduino.cc/arduino-uno-rev3)
+* [Arduino Zero](https://store.arduino.cc/usa/arduino-zero)
+* [BBC micro:bit](https://microbit.org/)
+* [BBC micro:bit v2](https://microbit.org/new-microbit/)
+* [blues wireless Swan](https://blues.io/products/swan/)
+* [Digispark](http://digistump.com/products/1)
+* [Dragino LoRaWAN GPS Tracker LGT-92](http://www.dragino.com/products/lora-lorawan-end-node/item/142-lgt-92.html)
+* [ESP32 - Core board](https://www.espressif.com/en/products/socs/esp32)
+* [ESP32 - mini32](https://www.espressif.com/en/products/socs/esp32)
+* [ESP32-C3-12f](https://www.espressif.com/en/products/socs/esp32-c3)
+* [ESP8266 - d1mini](https://www.espressif.com/en/products/socs/esp8266)
+* [ESP8266 - NodeMCU](https://www.espressif.com/en/products/socs/esp8266)
+* [Game Boy Advance](https://en.wikipedia.org/wiki/Game_Boy_Advance)
+* [iLabs Challenger RP2040 LoRa](https://ilabs.se/product/challenger-rp2040-lora/)
+* [M5Stack](https://docs.m5stack.com/en/core/basic)
+* [M5Stack Core2](https://shop.m5stack.com/products/m5stack-core2-esp32-iot-development-kit)
+* [M5Stamp C3](https://docs.m5stack.com/en/core/stamp_c3)
+* [Makerdiary nRF52840-MDK](https://wiki.makerdiary.com/nrf52840-mdk/)
+* [Makerdiary nRF52840-MDK USB Dongle](https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/)
+* [MCH2022 badge](https://badge.team/docs/badges/mch2022/)
+* [Microchip SAM E54 Xplained Pro](https://www.microchip.com/developmenttools/productdetails/atsame54-xpro)
+* [nice!nano](https://docs.nicekeyboards.com/#/nice!nano/)
+* [Nintendo Switch](https://www.nintendo.com/switch/)
+* [Nordic Semiconductor PCA10031](https://www.nordicsemi.com/eng/Products/nRF51-Dongle)
+* [Nordic Semiconductor PCA10040](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52-DK)
+* [Nordic Semiconductor PCA10056](https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK)
+* [Nordic Semiconductor pca10059](https://www.nordicsemi.com/Software-and-tools/Development-Kits/nRF52840-Dongle)
+* [Particle Argon](https://docs.particle.io/datasheets/wi-fi/argon-datasheet/)
+* [Particle Boron](https://docs.particle.io/datasheets/cellular/boron-datasheet/)
+* [Particle Xenon](https://docs.particle.io/datasheets/discontinued/xenon-datasheet/)
+* [Phytec reel board](https://www.phytec.eu/product-eu/internet-of-things/reelboard/)
+* [Pimoroni Badger2040](https://shop.pimoroni.com/products/badger-2040)
+* [Pimoroni Tufty2040](https://shop.pimoroni.com/products/tufty-2040)
+* [PineTime DevKit](https://www.pine64.org/pinetime/)
+* [PJRC Teensy 3.6](https://www.pjrc.com/store/teensy36.html)
+* [PJRC Teensy 4.0](https://www.pjrc.com/store/teensy40.html)
+* [PJRC Teensy 4.1](https://www.pjrc.com/store/teensy41.html)
+* [ProductivityOpen P1AM-100](https://facts-engineering.github.io/modules/P1AM-100/P1AM-100.html)
+* [Raspberry Pi Pico](https://www.raspberrypi.org/products/raspberry-pi-pico/)
+* [Raytac MDBT50Q-RX Dongle (with TinyUF2 bootloader)](https://www.adafruit.com/product/5199)
+* [Seeed Seeeduino XIAO](https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html)
+* [Seeed XIAO BLE](https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html)
+* [Seeed XIAO ESP32C3](https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html)
+* [Seeed XIAO RP2040](https://www.seeedstudio.com/XIAO-RP2040-v1-0-p-5026.html)
+* [Seeed LoRa-E5 Development Kit](https://www.seeedstudio.com/LoRa-E5-Dev-Kit-p-4868.html)
+* [Seeed Sipeed MAix BiT](https://www.seeedstudio.com/Sipeed-MAix-BiT-for-RISC-V-AI-IoT-p-2872.html)
+* [Seeed Wio Terminal](https://www.seeedstudio.com/Wio-Terminal-p-4509.html)
+* [SiFIve HiFive1 Rev B](https://www.sifive.com/boards/hifive1-rev-b)
+* [Sparkfun Thing Plus RP2040](https://www.sparkfun.com/products/17745)
+* [ST Micro "Nucleo" F103RB](https://www.st.com/en/evaluation-tools/nucleo-f103rb.html)
+* [ST Micro "Nucleo" F722ZE](https://www.st.com/en/evaluation-tools/nucleo-f722ze.html)
+* [ST Micro "Nucleo" L031K6](https://www.st.com/ja/evaluation-tools/nucleo-l031k6.html)
+* [ST Micro "Nucleo" L432KC](https://www.st.com/ja/evaluation-tools/nucleo-l432kc.html)
+* [ST Micro "Nucleo" L552ZE](https://www.st.com/en/evaluation-tools/nucleo-l552ze-q.html)
+* [ST Micro "Nucleo" WL55JC](https://www.st.com/en/evaluation-tools/nucleo-wl55jc.html)
+* [ST Micro STM32F103XX "Bluepill"](https://stm32-base.org/boards/STM32F103C8T6-Blue-Pill)
+* [ST Micro STM32F407 "Discovery"](https://www.st.com/en/evaluation-tools/stm32f4discovery.html)
+* [ST Micro STM32F469 "Discovery"](https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/32f469idiscovery.html)
+* [The Things Industries Generic Node Sensor Edition](https://www.genericnode.com/docs/sensor-edition/)
+* [Waveshare RP2040-Zero](https://www.waveshare.com/wiki/RP2040-Zero)
+* [X9 Pro smartwatch](https://github.com/curtpw/nRF5x-device-reverse-engineering/tree/master/X9-nrf52832-activity-tracker/)
 
-### WebAssembly
 
-TinyGo programs can be compiled for both WASM and WASI targets.
-
-For more information, see https://tinygo.org/docs/guides/webassembly/
-
-### Operating Systems
-
-You can also compile programs for Linux, macOS, and Windows targets.
-
-For more information:
-
-- Linux https://tinygo.org/docs/guides/linux/
-
-- macOS https://tinygo.org/docs/guides/macos/
-
-- Windows https://tinygo.org/docs/guides/windows/
+For more information, see [this list of boards](https://tinygo.org/microcontrollers/). Pull requests for additional support are welcome!
 
 ## Currently supported features:
 
@@ -142,7 +188,7 @@ Non-goals:
 
 ## Why this project exists
 
-> We never expected Go to be an embedded language, and so it’s got serious problems...
+> We never expected Go to be an embedded language and so its got serious problems...
 
 -- Rob Pike, [GopherCon 2014 Opening Keynote](https://www.youtube.com/watch?v=VoS7DsT1rdM&feature=youtu.be&t=2799)
 

builder/ar.go

@@ -3,7 +3,6 @@ package builder
 import (
 	"bytes"
 	"debug/elf"
-	"debug/macho"
 	"debug/pe"
 	"encoding/binary"
 	"errors"
@@ -13,11 +12,10 @@ import (
 	"path/filepath"
 	"time"
 
-	wasm "github.com/aykevl/go-wasm"
 	"github.com/blakesmith/ar"
 )
 
-// makeArchive creates an archive for static linking from a list of object files
+// makeArchive creates an arcive for static linking from a list of object files
 // given as a parameter. It is equivalent to the following command:
 //
 //	ar -rcs <archivePath> <objs...>
@@ -63,20 +61,6 @@ func makeArchive(arfile *os.File, objs []string) error {
 					fileIndex int
 				}{symbol.Name, i})
 			}
-		} else if dbg, err := macho.NewFile(objfile); err == nil {
-			for _, symbol := range dbg.Symtab.Syms {
-				// See mach-o/nlist.h
-				if symbol.Type&0x0e != 0xe { // (symbol.Type & N_TYPE) != N_SECT
-					continue // undefined symbol
-				}
-				if symbol.Type&0x01 == 0 { // (symbol.Type & N_EXT) == 0
-					continue // internal symbol (static, etc)
-				}
-				symbolTable = append(symbolTable, struct {
-					name      string
-					fileIndex int
-				}{symbol.Name, i})
-			}
 		} else if dbg, err := pe.NewFile(objfile); err == nil {
 			for _, symbol := range dbg.Symbols {
 				if symbol.StorageClass != 2 {
@@ -90,35 +74,8 @@ func makeArchive(arfile *os.File, objs []string) error {
 					fileIndex int
 				}{symbol.Name, i})
 			}
-		} else if dbg, err := wasm.Parse(objfile); err == nil {
-			for _, s := range dbg.Sections {
-				switch section := s.(type) {
-				case *wasm.SectionLinking:
-					for _, symbol := range section.Symbols {
-						if symbol.Flags&wasm.LinkingSymbolFlagUndefined != 0 {
-							// Don't list undefined functions.
-							continue
-						}
-						if symbol.Flags&wasm.LinkingSymbolFlagBindingLocal != 0 {
-							// Don't include local symbols.
-							continue
-						}
-						if symbol.Kind != wasm.LinkingSymbolKindFunction && symbol.Kind != wasm.LinkingSymbolKindData {
-							// Link functions and data symbols.
-							// Some data symbols need to be included, such as
-							// __log_data.
-							continue
-						}
-						// Include in the archive.
-						symbolTable = append(symbolTable, struct {
-							name      string
-							fileIndex int
-						}{symbol.Name, i})
-					}
-				}
-			}
 		} else {
-			return fmt.Errorf("failed to open file %s as WASM, ELF or PE/COFF: %w", objpath, err)
+			return fmt.Errorf("failed to open file %s as ELF or PE/COFF: %w", objpath, err)
 		}
 
 		// Close file, to avoid issues with too many open files (especially on
@@ -165,7 +122,7 @@ func makeArchive(arfile *os.File, objs []string) error {
 	}
 
 	// Keep track of the start of the symbol table.
-	symbolTableStart, err := arfile.Seek(0, io.SeekCurrent)
+	symbolTableStart, err := arfile.Seek(0, os.SEEK_CUR)
 	if err != nil {
 		return err
 	}
@@ -187,7 +144,7 @@ func makeArchive(arfile *os.File, objs []string) error {
 
 		// Store the start index, for when we'll update the symbol table with
 		// the correct file start indices.
-		offset, err := arfile.Seek(0, io.SeekCurrent)
+		offset, err := arfile.Seek(0, os.SEEK_CUR)
 		if err != nil {
 			return err
 		}

builder/bdwgc.go

@@ -1,91 +0,0 @@
-package builder
-
-// The well-known conservative Boehm-Demers-Weiser GC.
-// This file provides a way to compile this GC for use with TinyGo.
-
-import (
-	"path/filepath"
-	"strings"
-
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var BoehmGC = Library{
-	name: "bdwgc",
-	cflags: func(target, headerPath string) []string {
-		libdir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
-		flags := []string{
-			// use a modern environment
-			"-DUSE_MMAP",              // mmap is available
-			"-DUSE_MUNMAP",            // return memory to the OS using munmap
-			"-DGC_BUILTIN_ATOMIC",     // use compiler intrinsics for atomic operations
-			"-DNO_EXECUTE_PERMISSION", // don't make the heap executable
-
-			// specific flags for TinyGo
-			"-DALL_INTERIOR_POINTERS",  // scan interior pointers (needed for Go)
-			"-DIGNORE_DYNAMIC_LOADING", // we don't support dynamic loading at the moment
-			"-DNO_GETCONTEXT",          // musl doesn't support getcontext()
-			"-DGC_DISABLE_INCREMENTAL", // don't mess with SIGSEGV and such
-
-			// Use a minimal environment.
-			"-DNO_MSGBOX_ON_ERROR", // don't call MessageBoxA on Windows
-			"-DDONT_USE_ATEXIT",
-			"-DNO_GETENV",          // smaller binary, more predictable configuration
-			"-DNO_CLOCK",           // don't use system clock
-			"-DNO_DEBUGGING",       // reduce code size
-			"-DGC_NO_FINALIZATION", // finalization is not used at the moment
-
-			// Special flag to work around the lack of __data_start in ld.lld.
-			// TODO: try to fix this in LLVM/lld directly so we don't have to
-			// work around it anymore.
-			"-DGC_DONT_REGISTER_MAIN_STATIC_DATA",
-
-			// Do not scan the stack. We have our own mechanism to do this.
-			"-DSTACK_NOT_SCANNED",
-			"-DNO_PROC_STAT",  // we scan the stack manually (don't read /proc/self/stat on Linux)
-			"-DSTACKBOTTOM=0", // dummy value, we scan the stack manually
-
-			// Assertions can be enabled while debugging GC issues.
-			//"-DGC_ASSERTIONS",
-
-			// We use our own way of dealing with threads (that is a bit hacky).
-			// See src/runtime/gc_boehm.go.
-			//"-DGC_THREADS",
-			//"-DTHREAD_LOCAL_ALLOC",
-
-			"-I" + libdir + "/include",
-		}
-		return flags
-	},
-	needsLibc: true,
-	sourceDir: func() string {
-		return filepath.Join(goenv.Get("TINYGOROOT"), "lib/bdwgc")
-	},
-	librarySources: func(target string, _ bool) ([]string, error) {
-		sources := []string{
-			"allchblk.c",
-			"alloc.c",
-			"blacklst.c",
-			"dbg_mlc.c",
-			"dyn_load.c",
-			"headers.c",
-			"mach_dep.c",
-			"malloc.c",
-			"mark.c",
-			"mark_rts.c",
-			"misc.c",
-			"new_hblk.c",
-			"os_dep.c",
-			"reclaim.c",
-		}
-		if strings.Split(target, "-")[2] == "windows" {
-			// Due to how the linker on Windows works (that doesn't allow
-			// undefined functions), we need to include these extra files.
-			sources = append(sources,
-				"mallocx.c",
-				"ptr_chck.c",
-			)
-		}
-		return sources, nil
-	},
-}

builder/build.go

@@ -14,13 +14,12 @@ import (
 	"fmt"
 	"go/types"
 	"hash/crc32"
-	"maps"
+	"io/fs"
 	"math/bits"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
-	"slices"
 	"sort"
 	"strconv"
 	"strings"
@@ -62,10 +61,6 @@ type BuildResult struct {
 	// correctly printing test results: the import path isn't always the same as
 	// the path listed on the command line.
 	ImportPath string
-
-	// Map from path to package name. It is needed to attribute binary size to
-	// the right Go package.
-	PackagePathMap map[string]string
 }
 
 // packageAction is the struct that is serialized to JSON and hashed, to work as
@@ -88,7 +83,8 @@ type packageAction struct {
 	FileHashes       map[string]string // hash of every file that's part of the package
 	EmbeddedFiles    map[string]string // hash of all the //go:embed files in the package
 	Imports          map[string]string // map from imported package to action ID hash
-	OptLevel         string            // LLVM optimization level (O0, O1, O2, Os, Oz)
+	OptLevel         int               // LLVM optimization level (0-3)
+	SizeLevel        int               // LLVM optimization for size level (0-2)
 	UndefinedGlobals []string          // globals that are left as external globals (no initializer)
 }
 
@@ -119,28 +115,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		cacheDir = tmpdir
 	}
 
-	// Create default global values.
-	globalValues := map[string]map[string]string{
-		"runtime": {
-			"buildVersion": goenv.Version(),
-		},
-		"testing": {},
-	}
-	if config.TestConfig.CompileTestBinary {
-		// The testing.testBinary is set to "1" when in a test.
-		// This is needed for testing.Testing() to work correctly.
-		globalValues["testing"]["testBinary"] = "1"
-	}
-
-	// Copy over explicitly set global values, like
-	// -ldflags="-X main.Version="1.0"
-	for pkgPath, vals := range config.Options.GlobalValues {
-		if _, ok := globalValues[pkgPath]; !ok {
-			globalValues[pkgPath] = map[string]string{}
-		}
-		maps.Copy(globalValues[pkgPath], vals)
-	}
-
 	// Check for a libc dependency.
 	// As a side effect, this also creates the headers for the given libc, if
 	// the libc needs them.
@@ -148,45 +122,35 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	var libcDependencies []*compileJob
 	switch config.Target.Libc {
 	case "darwin-libSystem":
-		libcJob := makeDarwinLibSystemJob(config, tmpdir)
-		libcDependencies = append(libcDependencies, libcJob)
+		job := makeDarwinLibSystemJob(config, tmpdir)
+		libcDependencies = append(libcDependencies, job)
 	case "musl":
-		var unlock func()
-		libcJob, unlock, err := libMusl.load(config, tmpdir)
+		job, unlock, err := Musl.load(config, tmpdir)
 		if err != nil {
 			return BuildResult{}, err
 		}
 		defer unlock()
-		libcDependencies = append(libcDependencies, dummyCompileJob(filepath.Join(filepath.Dir(libcJob.result), "crt1.o")))
-		libcDependencies = append(libcDependencies, libcJob)
+		libcDependencies = append(libcDependencies, dummyCompileJob(filepath.Join(filepath.Dir(job.result), "crt1.o")))
+		libcDependencies = append(libcDependencies, job)
 	case "picolibc":
-		libcJob, unlock, err := libPicolibc.load(config, tmpdir)
+		libcJob, unlock, err := Picolibc.load(config, tmpdir)
 		if err != nil {
 			return BuildResult{}, err
 		}
 		defer unlock()
 		libcDependencies = append(libcDependencies, libcJob)
 	case "wasi-libc":
-		libcJob, unlock, err := libWasiLibc.load(config, tmpdir)
-		if err != nil {
-			return BuildResult{}, err
+		path := filepath.Join(root, "lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a")
+		if _, err := os.Stat(path); errors.Is(err, fs.ErrNotExist) {
+			return BuildResult{}, errors.New("could not find wasi-libc, perhaps you need to run `make wasi-libc`?")
 		}
-		defer unlock()
-		libcDependencies = append(libcDependencies, libcJob)
-	case "wasmbuiltins":
-		libcJob, unlock, err := libWasmBuiltins.load(config, tmpdir)
-		if err != nil {
-			return BuildResult{}, err
-		}
-		defer unlock()
-		libcDependencies = append(libcDependencies, libcJob)
+		libcDependencies = append(libcDependencies, dummyCompileJob(path))
 	case "mingw-w64":
-		libcJob, unlock, err := libMinGW.load(config, tmpdir)
+		_, unlock, err := MinGW.load(config, tmpdir)
 		if err != nil {
 			return BuildResult{}, err
 		}
-		defer unlock()
-		libcDependencies = append(libcDependencies, libcJob)
+		unlock()
 		libcDependencies = append(libcDependencies, makeMinGWExtraLibs(tmpdir, config.GOARCH())...)
 	case "":
 		// no library specified, so nothing to do
@@ -194,7 +158,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		return BuildResult{}, fmt.Errorf("unknown libc: %s", config.Target.Libc)
 	}
 
-	optLevel, speedLevel, sizeLevel := config.OptLevel()
+	optLevel, sizeLevel, _ := config.OptLevels()
 	compilerConfig := &compiler.Config{
 		Triple:          config.Triple(),
 		CPU:             config.CPU(),
@@ -202,20 +166,15 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		ABI:             config.ABI(),
 		GOOS:            config.GOOS(),
 		GOARCH:          config.GOARCH(),
-		BuildMode:       config.BuildMode(),
 		CodeModel:       config.CodeModel(),
 		RelocationModel: config.RelocationModel(),
 		SizeLevel:       sizeLevel,
-		TinyGoVersion:   goenv.Version(),
 
 		Scheduler:          config.Scheduler(),
 		AutomaticStackSize: config.AutomaticStackSize(),
 		DefaultStackSize:   config.StackSize(),
-		MaxStackAlloc:      config.MaxStackAlloc(),
 		NeedsStackObjects:  config.NeedsStackObjects(),
-		Debug:              !config.Options.SkipDWARF, // emit DWARF except when -internal-nodwarf is passed
-		Nobounds:           config.Options.Nobounds,
-		PanicStrategy:      config.PanicStrategy(),
+		Debug:              true,
 	}
 
 	// Load the target machine, which is the LLVM object that contains all
@@ -228,12 +187,9 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	defer machine.Dispose()
 
 	// Load entire program AST into memory.
-	lprogram, err := loader.Load(config, pkgName, types.Config{
+	lprogram, err := loader.Load(config, pkgName, config.ClangHeaders, types.Config{
 		Sizes: compiler.Sizes(machine),
 	})
-	if err != nil {
-		return BuildResult{}, err
-	}
 	result := BuildResult{
 		ModuleRoot: lprogram.MainPkg().Module.Dir,
 		MainDir:    lprogram.MainPkg().Dir,
@@ -243,29 +199,14 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		// If there is no module root, just the regular root.
 		result.ModuleRoot = lprogram.MainPkg().Root
 	}
+	if err != nil { // failed to load AST
+		return result, err
+	}
 	err = lprogram.Parse()
 	if err != nil {
 		return result, err
 	}
 
-	// Store which filesystem paths map to which package name.
-	result.PackagePathMap = make(map[string]string, len(lprogram.Packages))
-	for _, pkg := range lprogram.Sorted() {
-		result.PackagePathMap[pkg.OriginalDir()] = pkg.Pkg.Path()
-	}
-
-	// Strip default initializers for -X globals from the type info before
-	// building SSA. This prevents go/ssa from emitting init stores for them,
-	// so that makeGlobalsModule can supply the correct values at final link
-	// time without any runtime init overwriting them. The -X values themselves
-	// are kept out of the per-package build cache; only the variable names
-	// appear in the cache key.
-	for _, pkg := range lprogram.Sorted() {
-		for name := range globalValues[pkg.Pkg.Path()] {
-			pkg.StripVarInitializer(name)
-		}
-	}
-
 	// Create the *ssa.Program. This does not yet build the entire SSA of the
 	// program so it's pretty fast and doesn't need to be parallelized.
 	program := lprogram.LoadSSA()
@@ -275,11 +216,26 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	var packageJobs []*compileJob
 	packageActionIDJobs := make(map[string]*compileJob)
 
+	if config.Options.GlobalValues["runtime"]["buildVersion"] == "" {
+		version := goenv.Version
+		if strings.HasSuffix(goenv.Version, "-dev") && goenv.GitSha1 != "" {
+			version += "-" + goenv.GitSha1
+		}
+		if config.Options.GlobalValues == nil {
+			config.Options.GlobalValues = make(map[string]map[string]string)
+		}
+		if config.Options.GlobalValues["runtime"] == nil {
+			config.Options.GlobalValues["runtime"] = make(map[string]string)
+		}
+		config.Options.GlobalValues["runtime"]["buildVersion"] = version
+	}
+
 	var embedFileObjects []*compileJob
 	for _, pkg := range lprogram.Sorted() {
+		pkg := pkg // necessary to avoid a race condition
 
 		var undefinedGlobals []string
-		for name := range globalValues[pkg.Pkg.Path()] {
+		for name := range config.Options.GlobalValues[pkg.Pkg.Path()] {
 			undefinedGlobals = append(undefinedGlobals, name)
 		}
 		sort.Strings(undefinedGlobals)
@@ -292,13 +248,9 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				allFiles[file.Name] = append(allFiles[file.Name], file)
 			}
 		}
-		// Sort embedded files by name to maintain output determinism.
-		embedNames := make([]string, 0, len(allFiles))
-		for _, files := range allFiles {
-			embedNames = append(embedNames, files[0].Name)
-		}
-		slices.Sort(embedNames)
-		for _, name := range embedNames {
+		for name, files := range allFiles {
+			name := name
+			files := files
 			job := &compileJob{
 				description: "make object file for " + name,
 				run: func(job *compileJob) error {
@@ -313,7 +265,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					sum := sha256.Sum256(data)
 					hexSum := hex.EncodeToString(sum[:16])
 
-					for _, file := range allFiles[name] {
+					for _, file := range files {
 						file.Size = uint64(len(data))
 						file.Hash = hexSum
 						if file.NeedsData {
@@ -353,6 +305,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				actionID := packageAction{
 					ImportPath:       pkg.ImportPath,
 					CompilerBuildID:  string(compilerBuildID),
+					TinyGoVersion:    goenv.Version,
 					LLVMVersion:      llvm.Version,
 					Config:           compilerConfig,
 					CFlags:           pkg.CFlags,
@@ -360,6 +313,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					EmbeddedFiles:    make(map[string]string, len(allFiles)),
 					Imports:          make(map[string]string, len(pkg.Pkg.Imports())),
 					OptLevel:         optLevel,
+					SizeLevel:        sizeLevel,
 					UndefinedGlobals: undefinedGlobals,
 				}
 				for filePath, hash := range pkg.FileHashes {
@@ -404,7 +358,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				defer mod.Context().Dispose()
 				defer mod.Dispose()
 				if errs != nil {
-					return newMultiError(errs, pkg.ImportPath)
+					return newMultiError(errs)
 				}
 				if err := llvm.VerifyModule(mod, llvm.PrintMessageAction); err != nil {
 					return errors.New("verification error after compiling package " + pkg.ImportPath)
@@ -466,15 +420,8 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					if global.IsNil() {
 						return errors.New("global not found: " + globalName)
 					}
-					globalType := global.GlobalValueType()
-					if globalType.TypeKind() != llvm.StructTypeKind || globalType.StructName() != "runtime._string" {
-						// Verify this is indeed a string. This is needed so
-						// that makeGlobalsModule can just create the right
-						// globals of string type without checking.
-						return fmt.Errorf("%s: not a string", globalName)
-					}
 					name := global.Name()
-					newGlobal := llvm.AddGlobal(mod, globalType, name+".tmp")
+					newGlobal := llvm.AddGlobal(mod, global.GlobalValueType(), name+".tmp")
 					global.ReplaceAllUsesWith(newGlobal)
 					global.EraseFromParentAsGlobal()
 					newGlobal.SetName(name)
@@ -487,7 +434,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				if pkgInit.IsNil() {
 					panic("init not found for " + pkg.Pkg.Path())
 				}
-				err := interp.RunFunc(pkgInit, config.Options.InterpTimeout, config.Options.InterpMaxLoopIterations, config.DumpSSA())
+				err := interp.RunFunc(pkgInit, config.Options.InterpTimeout, config.DumpSSA())
 				if err != nil {
 					return err
 				}
@@ -556,38 +503,12 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				if err != nil {
 					return fmt.Errorf("failed to load bitcode file: %w", err)
 				}
-				// Resolve duplicate function definitions before linking.
-				// This can happen when a newer Go version adds a function
-				// body in a standard library package that was previously
-				// just a declaration provided by //go:linkname from the
-				// runtime. In that case, keep the existing (runtime)
-				// definition by weakening the new one's linkage so the
-				// LLVM linker discards it in favor of the existing one.
-				for fn := pkgMod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
-					if fn.IsDeclaration() {
-						continue
-					}
-					existing := mod.NamedFunction(fn.Name())
-					if existing.IsNil() || existing.IsDeclaration() {
-						continue
-					}
-					fn.SetLinkage(llvm.LinkOnceODRLinkage)
-				}
 				err = llvm.LinkModules(mod, pkgMod)
 				if err != nil {
 					return fmt.Errorf("failed to link module: %w", err)
 				}
 			}
 
-			// Insert values from -ldflags="-X ..." into the IR.
-			// This is a separate module, so that the "runtime._string" type
-			// doesn't need to match precisely. LLVM tends to rename that type
-			// sometimes, leading to errors. But linking in a separate module
-			// works fine. See:
-			// https://github.com/tinygo-org/tinygo/issues/4810
-			globalsMod := makeGlobalsModule(ctx, globalValues, machine)
-			llvm.LinkModules(mod, globalsMod)
-
 			// Create runtime.initAll function that calls the runtime
 			// initializer of each package.
 			llvmInitFn := mod.NamedFunction("runtime.initAll")
@@ -599,13 +520,13 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			irbuilder := mod.Context().NewBuilder()
 			defer irbuilder.Dispose()
 			irbuilder.SetInsertPointAtEnd(block)
-			ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
+			i8ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
 			for _, pkg := range lprogram.Sorted() {
 				pkgInit := mod.NamedFunction(pkg.Pkg.Path() + ".init")
 				if pkgInit.IsNil() {
 					panic("init not found for " + pkg.Pkg.Path())
 				}
-				irbuilder.CreateCall(pkgInit.GlobalValueType(), pkgInit, []llvm.Value{llvm.Undef(ptrType)}, "")
+				irbuilder.CreateCall(pkgInit.GlobalValueType(), pkgInit, []llvm.Value{llvm.Undef(i8ptrType)}, "")
 			}
 			irbuilder.CreateRetVoid()
 
@@ -654,11 +575,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		},
 	}
 
-	// Create the output directory, if needed
-	if err := os.MkdirAll(filepath.Dir(outpath), 0777); err != nil {
-		return result, err
-	}
-
 	// Check whether we only need to create an object file.
 	// If so, we don't need to link anything and will be finished quickly.
 	outext := filepath.Ext(outpath)
@@ -678,7 +594,12 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			defer llvmBuf.Dispose()
 			return result, os.WriteFile(outpath, llvmBuf.Bytes(), 0666)
 		case ".bc":
-			buf := llvm.WriteThinLTOBitcodeToMemoryBuffer(mod)
+			var buf llvm.MemoryBuffer
+			if config.UseThinLTO() {
+				buf = llvm.WriteThinLTOBitcodeToMemoryBuffer(mod)
+			} else {
+				buf = llvm.WriteBitcodeToMemoryBuffer(mod)
+			}
 			defer buf.Dispose()
 			return result, os.WriteFile(outpath, buf.Bytes(), 0666)
 		case ".ll":
@@ -700,7 +621,16 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		dependencies: []*compileJob{programJob},
 		result:       objfile,
 		run: func(*compileJob) error {
-			llvmBuf := llvm.WriteThinLTOBitcodeToMemoryBuffer(mod)
+			var llvmBuf llvm.MemoryBuffer
+			if config.UseThinLTO() {
+				llvmBuf = llvm.WriteThinLTOBitcodeToMemoryBuffer(mod)
+			} else {
+				var err error
+				llvmBuf, err = machine.EmitToMemoryBuffer(mod, llvm.ObjectFile)
+				if err != nil {
+					return err
+				}
+			}
 			defer llvmBuf.Dispose()
 			return os.WriteFile(objfile, llvmBuf.Bytes(), 0666)
 		},
@@ -715,27 +645,10 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	result.Binary = result.Executable // final file
 	ldflags := append(config.LDFlags(), "-o", result.Executable)
 
-	if config.Options.BuildMode == "c-shared" {
-		if !strings.HasPrefix(config.Triple(), "wasm32-") {
-			return result, fmt.Errorf("buildmode c-shared is only supported on wasm at the moment")
-		}
-		ldflags = append(ldflags, "--no-entry")
-	}
-
-	if config.Options.BuildMode == "wasi-legacy" {
-		if !strings.HasPrefix(config.Triple(), "wasm32-") {
-			return result, fmt.Errorf("buildmode wasi-legacy is only supported on wasm")
-		}
-
-		if config.Options.Scheduler != "none" {
-			return result, fmt.Errorf("buildmode wasi-legacy only supports scheduler=none")
-		}
-	}
-
 	// Add compiler-rt dependency if needed. Usually this is a simple load from
 	// a cache.
 	if config.Target.RTLib == "compiler-rt" {
-		job, unlock, err := libCompilerRT.load(config, tmpdir)
+		job, unlock, err := CompilerRT.load(config, tmpdir)
 		if err != nil {
 			return result, err
 		}
@@ -743,16 +656,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		linkerDependencies = append(linkerDependencies, job)
 	}
 
-	// The Boehm collector is stored in a separate C library.
-	if config.GC() == "boehm" {
-		job, unlock, err := BoehmGC.load(config, tmpdir)
-		if err != nil {
-			return BuildResult{}, err
-		}
-		defer unlock()
-		linkerDependencies = append(linkerDependencies, job)
-	}
-
 	// Add jobs to compile extra files. These files are in C or assembly and
 	// contain things like the interrupt vector table and low level operations
 	// such as stack switching.
@@ -761,7 +664,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		job := &compileJob{
 			description: "compile extra file " + path,
 			run: func(job *compileJob) error {
-				result, err := compileAndCacheCFile(abspath, tmpdir, config.CFlags(false), config.Options.PrintCommands)
+				result, err := compileAndCacheCFile(abspath, tmpdir, config.CFlags(), config.UseThinLTO(), config.Options.PrintCommands)
 				job.result = result
 				return err
 			},
@@ -773,12 +676,13 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 	// TODO: do this as part of building the package to be able to link the
 	// bitcode files together.
 	for _, pkg := range lprogram.Sorted() {
+		pkg := pkg
 		for _, filename := range pkg.CFiles {
-			abspath := filepath.Join(pkg.OriginalDir(), filename)
+			abspath := filepath.Join(pkg.Dir, filename)
 			job := &compileJob{
 				description: "compile CGo file " + abspath,
 				run: func(job *compileJob) error {
-					result, err := compileAndCacheCFile(abspath, tmpdir, pkg.CFlags, config.Options.PrintCommands)
+					result, err := compileAndCacheCFile(abspath, tmpdir, pkg.CFlags, config.UseThinLTO(), config.Options.PrintCommands)
 					job.result = result
 					return err
 				},
@@ -837,45 +741,43 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				}
 				ldflags = append(ldflags, dependency.result)
 			}
-			ldflags = append(ldflags, "-mllvm", "-mcpu="+config.CPU())
-			ldflags = append(ldflags, "-mllvm", "-mattr="+config.Features()) // needed for MIPS softfloat
-			switch config.LinkerFlavor() {
-			case "coff":
-				// Options for driving ld.lld in PE/COFF mode.
-				ldflags = append(ldflags,
-					"-Xlink=/opt:lldlto="+strconv.Itoa(speedLevel),
-					"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"))
-			case "darwin":
-				// Options for the ld64-compatible lld linker.
-				ldflags = append(ldflags,
-					"--lto-O"+strconv.Itoa(speedLevel),
-					"-cache_path_lto", filepath.Join(cacheDir, "thinlto"))
-			case "gnu":
-				// Options for the ELF linker.
-				ldflags = append(ldflags,
-					"--lto-O"+strconv.Itoa(speedLevel),
-					"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"),
-				)
-			default:
-				return fmt.Errorf("unknown linker flavor: %s", config.LinkerFlavor())
-			}
-			if config.CodeModel() != "default" {
-				ldflags = append(ldflags,
-					"-mllvm", "-code-model="+config.CodeModel())
-			}
-			if sizeLevel >= 2 {
-				// Workaround with roughly the same effect as
-				// https://reviews.llvm.org/D119342.
-				// Can hopefully be removed in LLVM 19.
-				ldflags = append(ldflags,
-					"-mllvm", "--rotation-max-header-size=0")
+			if config.UseThinLTO() {
+				ldflags = append(ldflags, "-mllvm", "-mcpu="+config.CPU())
+				if config.GOOS() == "windows" {
+					// Options for the MinGW wrapper for the lld COFF linker.
+					ldflags = append(ldflags,
+						"-Xlink=/opt:lldlto="+strconv.Itoa(optLevel),
+						"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"))
+				} else if config.GOOS() == "darwin" {
+					// Options for the ld64-compatible lld linker.
+					ldflags = append(ldflags,
+						"--lto-O"+strconv.Itoa(optLevel),
+						"-cache_path_lto", filepath.Join(cacheDir, "thinlto"))
+				} else {
+					// Options for the ELF linker.
+					ldflags = append(ldflags,
+						"--lto-O"+strconv.Itoa(optLevel),
+						"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"),
+					)
+				}
+				if config.CodeModel() != "default" {
+					ldflags = append(ldflags,
+						"-mllvm", "-code-model="+config.CodeModel())
+				}
+				if sizeLevel >= 2 {
+					// Workaround with roughly the same effect as
+					// https://reviews.llvm.org/D119342.
+					// Can hopefully be removed in LLVM 15.
+					ldflags = append(ldflags,
+						"-mllvm", "--rotation-max-header-size=0")
+				}
 			}
 			if config.Options.PrintCommands != nil {
 				config.Options.PrintCommands(config.Target.Linker, ldflags...)
 			}
 			err = link(config.Target.Linker, ldflags...)
 			if err != nil {
-				return err
+				return &commandError{"failed to link", result.Executable, err}
 			}
 
 			var calculatedStacks []string
@@ -899,12 +801,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					return fmt.Errorf("could not modify stack sizes: %w", err)
 				}
 			}
-
-			// Apply patches of bootloader in the order they appear.
-			if len(config.Target.BootPatches) > 0 {
-				err = applyPatches(result.Executable, config.Target.BootPatches)
-			}
-
 			if config.RP2040BootPatch() {
 				// Patch the second stage bootloader CRC into the .boot2 section
 				err = patchRP2040BootCRC(result.Executable)
@@ -914,9 +810,22 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			}
 
 			// Run wasm-opt for wasm binaries
-			if arch, _, _ := strings.Cut(config.Triple(), "-"); arch == "wasm32" {
-				optLevel, _, _ := config.OptLevel()
-				opt := "-" + optLevel
+			if arch := strings.Split(config.Triple(), "-")[0]; arch == "wasm32" {
+				var opt string
+				switch config.Options.Opt {
+				case "none", "0":
+					opt = "-O0"
+				case "1":
+					opt = "-O1"
+				case "2":
+					opt = "-O2"
+				case "s":
+					opt = "-Os"
+				case "z":
+					opt = "-Oz"
+				default:
+					return fmt.Errorf("unknown opt level: %q", config.Options.Opt)
+				}
 
 				var args []string
 
@@ -924,20 +833,14 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					args = append(args, "--asyncify")
 				}
 
-				inputFile := result.Binary
-				result.Binary = result.Executable + ".wasmopt"
 				args = append(args,
 					opt,
 					"-g",
-					inputFile,
-					"--output", result.Binary,
+					result.Executable,
+					"--output", result.Executable,
 				)
 
-				wasmopt := goenv.Get("WASMOPT")
-				if config.Options.PrintCommands != nil {
-					config.Options.PrintCommands(wasmopt, args...)
-				}
-				cmd := exec.Command(wasmopt, args...)
+				cmd := exec.Command(goenv.Get("WASMOPT"), args...)
 				cmd.Stdout = os.Stdout
 				cmd.Stderr = os.Stderr
 
@@ -947,77 +850,20 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				}
 			}
 
-			// Run wasm-tools for component-model binaries
-			witPackage := strings.ReplaceAll(config.Target.WITPackage, "{root}", goenv.Get("TINYGOROOT"))
-			if config.Options.WITPackage != "" {
-				witPackage = config.Options.WITPackage
-			}
-			witWorld := config.Target.WITWorld
-			if config.Options.WITWorld != "" {
-				witWorld = config.Options.WITWorld
-			}
-			if witPackage != "" && witWorld != "" {
-
-				// wasm-tools component embed -w wasi:cli/command
-				// 		$$(tinygo env TINYGOROOT)/lib/wasi-cli/wit/ main.wasm -o embedded.wasm
-				componentEmbedInputFile := result.Binary
-				result.Binary = result.Executable + ".wasm-component-embed"
-				args := []string{
-					"component",
-					"embed",
-					"-w", witWorld,
-					witPackage,
-					componentEmbedInputFile,
-					"-o", result.Binary,
-				}
-
-				wasmtools := goenv.Get("WASMTOOLS")
-				if config.Options.PrintCommands != nil {
-					config.Options.PrintCommands(wasmtools, args...)
-				}
-				cmd := exec.Command(wasmtools, args...)
-				cmd.Stdout = os.Stdout
-				cmd.Stderr = os.Stderr
-
-				err := cmd.Run()
-				if err != nil {
-					return fmt.Errorf("`wasm-tools component embed` failed: %w", err)
-				}
-
-				// wasm-tools component new embedded.wasm -o component.wasm
-				componentNewInputFile := result.Binary
-				result.Binary = result.Executable + ".wasm-component-new"
-				args = []string{
-					"component",
-					"new",
-					componentNewInputFile,
-					"-o", result.Binary,
-				}
-
-				if config.Options.PrintCommands != nil {
-					config.Options.PrintCommands(wasmtools, args...)
-				}
-				cmd = exec.Command(wasmtools, args...)
-				cmd.Stdout = os.Stdout
-				cmd.Stderr = os.Stderr
-
-				err = cmd.Run()
-				if err != nil {
-					return fmt.Errorf("`wasm-tools component new` failed: %w", err)
-				}
-			}
-
 			// Print code size if requested.
-			if config.Options.PrintSizes != "" {
-				sizes, err := loadProgramSize(result.Executable, result.PackagePathMap)
+			if config.Options.PrintSizes == "short" || config.Options.PrintSizes == "full" {
+				packagePathMap := make(map[string]string, len(lprogram.Packages))
+				for _, pkg := range lprogram.Sorted() {
+					packagePathMap[pkg.OriginalDir()] = pkg.Pkg.Path()
+				}
+				sizes, err := loadProgramSize(result.Executable, packagePathMap)
 				if err != nil {
 					return err
 				}
-				switch config.Options.PrintSizes {
-				case "short":
+				if config.Options.PrintSizes == "short" {
 					fmt.Printf("   code    data     bss |   flash     ram\n")
 					fmt.Printf("%7d %7d %7d | %7d %7d\n", sizes.Code+sizes.ROData, sizes.Data, sizes.BSS, sizes.Flash(), sizes.RAM())
-				case "full":
+				} else {
 					if !config.Debug() {
 						fmt.Println("warning: data incomplete, remove the -no-debug flag for more detail")
 					}
@@ -1029,13 +875,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 					}
 					fmt.Printf("------------------------------- | --------------- | -------\n")
 					fmt.Printf("%7d %7d %7d %7d | %7d %7d | total\n", sizes.Code, sizes.ROData, sizes.Data, sizes.BSS, sizes.Code+sizes.ROData+sizes.Data, sizes.Data+sizes.BSS)
-				case "html":
-					const filename = "size-report.html"
-					err := writeSizeReport(sizes, filename, pkgName)
-					if err != nil {
-						return err
-					}
-					fmt.Println("Wrote size report to", filename)
 				}
 			}
 
@@ -1076,18 +915,23 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		if err != nil {
 			return result, err
 		}
-	case "esp32", "esp32-img", "esp32c3", "esp32s3", "esp32c6", "esp8266":
+	case "esp32", "esp32-img", "esp32c3", "esp8266":
 		// Special format for the ESP family of chips (parsed by the ROM
 		// bootloader).
 		result.Binary = filepath.Join(tmpdir, "main"+outext)
-		err := makeESPFirmwareImage(result.Executable, result.Binary, outputBinaryFormat)
+		err := makeESPFirmareImage(result.Executable, result.Binary, outputBinaryFormat)
 		if err != nil {
 			return result, err
 		}
 	case "nrf-dfu":
 		// special format for nrfutil for Nordic chips
+		tmphexpath := filepath.Join(tmpdir, "main.hex")
+		err := objcopy(result.Executable, tmphexpath, "hex")
+		if err != nil {
+			return result, err
+		}
 		result.Binary = filepath.Join(tmpdir, "main"+outext)
-		err = makeDFUFirmwareImage(config.Options, result.Executable, result.Binary)
+		err = makeDFUFirmwareImage(config.Options, tmphexpath, result.Binary)
 		if err != nil {
 			return result, err
 		}
@@ -1208,7 +1052,7 @@ func createEmbedObjectFile(data, hexSum, sourceFile, sourceDir, tmpdir string, c
 // needed to convert a program to its final form. Some transformations are not
 // optional and must be run as the compiler expects them to run.
 func optimizeProgram(mod llvm.Module, config *compileopts.Config) error {
-	err := interp.Run(mod, config.Options.InterpTimeout, config.Options.InterpMaxLoopIterations, config.DumpSSA())
+	err := interp.Run(mod, config.Options.InterpTimeout, config.DumpSSA())
 	if err != nil {
 		return err
 	}
@@ -1225,11 +1069,33 @@ func optimizeProgram(mod llvm.Module, config *compileopts.Config) error {
 		}
 	}
 
-	// Run most of the whole-program optimizations (including the whole
-	// O0/O1/O2/Os/Oz optimization pipeline).
-	errs := transform.Optimize(mod, config)
+	if config.GOOS() != "darwin" && !config.UseThinLTO() {
+		transform.ApplyFunctionSections(mod) // -ffunction-sections
+	}
+
+	// Insert values from -ldflags="-X ..." into the IR.
+	err = setGlobalValues(mod, config.Options.GlobalValues)
+	if err != nil {
+		return err
+	}
+
+	// Browsers cannot handle external functions that have type i64 because it
+	// cannot be represented exactly in JavaScript (JS only has doubles). To
+	// keep functions interoperable, pass int64 types as pointers to
+	// stack-allocated values.
+	if config.WasmAbi() == "js" {
+		err := transform.ExternalInt64AsPtr(mod, config)
+		if err != nil {
+			return err
+		}
+	}
+
+	// Optimization levels here are roughly the same as Clang, but probably not
+	// exactly.
+	optLevel, sizeLevel, inlinerThreshold := config.OptLevels()
+	errs := transform.Optimize(mod, config, optLevel, sizeLevel, inlinerThreshold)
 	if len(errs) > 0 {
-		return newMultiError(errs, "")
+		return newMultiError(errs)
 	}
 	if err := llvm.VerifyModule(mod, llvm.PrintMessageAction); err != nil {
 		return errors.New("verification failure after LLVM optimization passes")
@@ -1238,19 +1104,10 @@ func optimizeProgram(mod llvm.Module, config *compileopts.Config) error {
 	return nil
 }
 
-func makeGlobalsModule(ctx llvm.Context, globals map[string]map[string]string, machine llvm.TargetMachine) llvm.Module {
-	mod := ctx.NewModule("cmdline-globals")
-	targetData := machine.CreateTargetData()
-	defer targetData.Dispose()
-	mod.SetDataLayout(targetData.String())
-
-	stringType := ctx.StructCreateNamed("runtime._string")
-	uintptrType := ctx.IntType(targetData.PointerSize() * 8)
-	stringType.StructSetBody([]llvm.Type{
-		llvm.PointerType(ctx.Int8Type(), 0),
-		uintptrType,
-	}, false)
-
+// setGlobalValues sets the global values from the -ldflags="-X ..." compiler
+// option in the given module. An error may be returned if the global is not of
+// the expected type.
+func setGlobalValues(mod llvm.Module, globals map[string]map[string]string) error {
 	var pkgPaths []string
 	for pkgPath := range globals {
 		pkgPaths = append(pkgPaths, pkgPath)
@@ -1266,6 +1123,24 @@ func makeGlobalsModule(ctx llvm.Context, globals map[string]map[string]string, m
 		for _, name := range names {
 			value := pkg[name]
 			globalName := pkgPath + "." + name
+			global := mod.NamedGlobal(globalName)
+			if global.IsNil() || !global.Initializer().IsNil() {
+				// The global either does not exist (optimized away?) or has
+				// some value, in which case it has already been initialized at
+				// package init time.
+				continue
+			}
+
+			// A strin is a {ptr, len} pair. We need these types to build the
+			// initializer.
+			initializerType := global.GlobalValueType()
+			if initializerType.TypeKind() != llvm.StructTypeKind || initializerType.StructName() == "" {
+				return fmt.Errorf("%s: not a string", globalName)
+			}
+			elementTypes := initializerType.StructElementTypes()
+			if len(elementTypes) != 2 {
+				return fmt.Errorf("%s: not a string", globalName)
+			}
 
 			// Create a buffer for the string contents.
 			bufInitializer := mod.Context().ConstString(value, false)
@@ -1276,20 +1151,22 @@ func makeGlobalsModule(ctx llvm.Context, globals map[string]map[string]string, m
 			buf.SetLinkage(llvm.PrivateLinkage)
 
 			// Create the string value, which is a {ptr, len} pair.
-			length := llvm.ConstInt(uintptrType, uint64(len(value)), false)
-			initializer := llvm.ConstNamedStruct(stringType, []llvm.Value{
-				buf,
+			zero := llvm.ConstInt(mod.Context().Int32Type(), 0, false)
+			ptr := llvm.ConstGEP(bufInitializer.Type(), buf, []llvm.Value{zero, zero})
+			if ptr.Type() != elementTypes[0] {
+				return fmt.Errorf("%s: not a string", globalName)
+			}
+			length := llvm.ConstInt(elementTypes[1], uint64(len(value)), false)
+			initializer := llvm.ConstNamedStruct(initializerType, []llvm.Value{
+				ptr,
 				length,
 			})
 
-			// Create the string global.
-			global := llvm.AddGlobal(mod, stringType, globalName)
+			// Set the initializer. No initializer should be set at this point.
 			global.SetInitializer(initializer)
-			global.SetAlignment(targetData.PrefTypeAlignment(stringType))
 		}
 	}
-
-	return mod
+	return nil
 }
 
 // functionStackSizes keeps stack size information about a single function
@@ -1345,21 +1222,13 @@ func determineStackSizes(mod llvm.Module, executable string) ([]string, map[stri
 	}
 
 	// Goroutines need to be started and finished and take up some stack space
-	// that way. This can be measured by measuring the stack size of
+	// that way. This can be measured by measuing the stack size of
 	// tinygo_startTask.
 	if numFuncs := len(functions["tinygo_startTask"]); numFuncs != 1 {
 		return nil, nil, fmt.Errorf("expected exactly one definition of tinygo_startTask, got %d", numFuncs)
 	}
 	baseStackSize, baseStackSizeType, baseStackSizeFailedAt := functions["tinygo_startTask"][0].StackSize()
 
-	// Account for the bytes that tinygo_swapTask pushes onto the goroutine stack
-	// on every context switch. The static analysis correctly traces Go calls,
-	// but it cannot see into the assembly-level register push.
-	var contextSwitchOverhead uint64
-	if swapFuncs, ok := functions["tinygo_swapTask"]; ok && len(swapFuncs) == 1 {
-		contextSwitchOverhead = swapFuncs[0].FrameSize
-	}
-
 	sizes := make(map[string]functionStackSize)
 
 	// Add the reset handler function, for convenience. The reset handler runs
@@ -1408,12 +1277,6 @@ func determineStackSizes(mod llvm.Module, executable string) ([]string, map[stri
 			// overflow will occur even before the goroutine is started.
 			stackSize = baseStackSize
 		}
-		if stackSizeType == stacksize.Bounded {
-			// Add the overhead of context switching. This is needed because the
-			// context switch (tinygo_swapTask) pushes callee-saved registers
-			// onto the current stack, which is not seen by the static analysis.
-			stackSize += contextSwitchOverhead
-		}
 		sizes[name] = functionStackSize{
 			stackSize:        stackSize,
 			stackSizeType:    stackSizeType,
@@ -1522,23 +1385,6 @@ func printStacks(calculatedStacks []string, stackSizes map[string]functionStackS
 	}
 }
 
-func applyPatches(executable string, bootPatches []string) (err error) {
-	for _, patch := range bootPatches {
-		switch patch {
-		case "rp2040":
-			err = patchRP2040BootCRC(executable)
-		// case "rp2350":
-		// 	err = patchRP2350BootIMAGE_DEF(executable)
-		default:
-			err = errors.New("undefined boot patch name")
-		}
-		if err != nil {
-			return fmt.Errorf("apply boot patch %q: %w", patch, err)
-		}
-	}
-	return nil
-}
-
 // RP2040 second stage bootloader CRC32 calculation
 //
 // Spec: https://datasheets.raspberrypi.org/rp2040/rp2040-datasheet.pdf
@@ -1550,7 +1396,7 @@ func patchRP2040BootCRC(executable string) error {
 	}
 
 	if len(bytes) != 256 {
-		return fmt.Errorf("rp2040 .boot2 section must be exactly 256 bytes, got %d", len(bytes))
+		return fmt.Errorf("rp2040 .boot2 section must be exactly 256 bytes")
 	}
 
 	// From the 'official' RP2040 checksum script:
@@ -1589,10 +1435,3 @@ func lock(path string) func() {
 
 	return func() { flock.Close() }
 }
-
-func b2u8(b bool) uint8 {
-	if b {
-		return 1
-	}
-	return 0
-}

builder/builder_test.go

@@ -5,10 +5,10 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
-	"strings"
 	"testing"
 
 	"github.com/tinygo-org/tinygo/compileopts"
+	"github.com/tinygo-org/tinygo/goenv"
 	"tinygo.org/x/go-llvm"
 )
 
@@ -29,19 +29,13 @@ func TestClangAttributes(t *testing.T) {
 		"cortex-m4",
 		"cortex-m7",
 		"esp32c3",
-		"esp32c6",
-		"esp32s3",
 		"fe310",
 		"gameboy-advance",
 		"k210",
 		"nintendoswitch",
 		"riscv-qemu",
-		"tkey",
-		"uefi-amd64",
-		"wasip1",
-		"wasip2",
+		"wasi",
 		"wasm",
-		"wasm-unknown",
 	}
 	if hasBuiltinTools {
 		// hasBuiltinTools is set when TinyGo is statically linked with LLVM,
@@ -49,6 +43,7 @@ func TestClangAttributes(t *testing.T) {
 		targetNames = append(targetNames, "esp32", "esp8266")
 	}
 	for _, targetName := range targetNames {
+		targetName := targetName
 		t.Run(targetName, func(t *testing.T) {
 			testClangAttributes(t, &compileopts.Options{Target: targetName})
 		})
@@ -57,20 +52,12 @@ func TestClangAttributes(t *testing.T) {
 	for _, options := range []*compileopts.Options{
 		{GOOS: "linux", GOARCH: "386"},
 		{GOOS: "linux", GOARCH: "amd64"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "5,softfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "6,softfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "7,softfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "5,hardfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "6,hardfloat"},
-		{GOOS: "linux", GOARCH: "arm", GOARM: "7,hardfloat"},
+		{GOOS: "linux", GOARCH: "arm", GOARM: "5"},
+		{GOOS: "linux", GOARCH: "arm", GOARM: "6"},
+		{GOOS: "linux", GOARCH: "arm", GOARM: "7"},
 		{GOOS: "linux", GOARCH: "arm64"},
-		{GOOS: "linux", GOARCH: "mips", GOMIPS: "hardfloat"},
-		{GOOS: "linux", GOARCH: "mipsle", GOMIPS: "hardfloat"},
-		{GOOS: "linux", GOARCH: "mips", GOMIPS: "softfloat"},
-		{GOOS: "linux", GOARCH: "mipsle", GOMIPS: "softfloat"},
 		{GOOS: "darwin", GOARCH: "amd64"},
 		{GOOS: "darwin", GOARCH: "arm64"},
-		{GOOS: "windows", GOARCH: "386"},
 		{GOOS: "windows", GOARCH: "amd64"},
 		{GOOS: "windows", GOARCH: "arm64"},
 	} {
@@ -78,9 +65,6 @@ func TestClangAttributes(t *testing.T) {
 		if options.GOARCH == "arm" {
 			name += ",GOARM=" + options.GOARM
 		}
-		if options.GOARCH == "mips" || options.GOARCH == "mipsle" {
-			name += ",GOMIPS=" + options.GOMIPS
-		}
 		t.Run(name, func(t *testing.T) {
 			testClangAttributes(t, options)
 		})
@@ -89,6 +73,7 @@ func TestClangAttributes(t *testing.T) {
 
 func testClangAttributes(t *testing.T, options *compileopts.Options) {
 	testDir := t.TempDir()
+	clangHeaderPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
 
 	ctx := llvm.NewContext()
 	defer ctx.Dispose()
@@ -98,8 +83,9 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 		t.Fatalf("could not load target: %s", err)
 	}
 	config := compileopts.Config{
-		Options: options,
-		Target:  target,
+		Options:      options,
+		Target:       target,
+		ClangHeaders: clangHeaderPath,
 	}
 
 	// Create a very simple C input file.
@@ -111,7 +97,7 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 
 	// Compile this file using Clang.
 	outpath := filepath.Join(testDir, "test.bc")
-	flags := append([]string{"-c", "-emit-llvm", "-o", outpath, srcpath}, config.CFlags(false)...)
+	flags := append([]string{"-c", "-emit-llvm", "-o", outpath, srcpath}, config.CFlags()...)
 	if config.GOOS() == "darwin" {
 		// Silence some warnings that happen when testing GOOS=darwin on
 		// something other than MacOS.
@@ -130,10 +116,8 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 	defer mod.Dispose()
 
 	// Check whether the LLVM target matches.
-	// Use ClangTriple since LLVM 22 normalizes wasm32-unknown-wasi to wasip1.
-	expectedTriple := compileopts.ClangTriple(config.Triple())
-	if mod.Target() != expectedTriple {
-		t.Errorf("target has LLVM triple %#v but Clang makes it LLVM triple %#v", expectedTriple, mod.Target())
+	if mod.Target() != config.Triple() {
+		t.Errorf("target has LLVM triple %#v but Clang makes it LLVM triple %#v", config.Triple(), mod.Target())
 	}
 
 	// Check the "target-cpu" and "target-features" string attribute of the add
@@ -157,65 +141,11 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 			// The reason is that Debian has patched Clang in a way that
 			// modifies the LLVM features string, changing lots of FPU/float
 			// related flags. We want to test vanilla Clang, not Debian Clang.
-			//
-			// Rather than requiring an exact match (which breaks across LLVM
-			// versions as new features are added), check that every feature
-			// TinyGo specifies is consistent with what Clang produces:
-			//  - A "+feature" in TinyGo must appear in Clang's output.
-			//  - A "-feature" in TinyGo must not be "+feature" in Clang's output.
-			checkFeatureFlags(t, config.Features(), features)
+			t.Errorf("target has LLVM features\n\t%#v\nbut Clang makes it\n\t%#v", config.Features(), features)
 		}
 	}
 }
 
-// checkFeatureFlags verifies that all features specified by TinyGo's target
-// configuration are consistent with Clang's output. This allows Clang to add
-// new features across LLVM versions without breaking the test.
-func checkFeatureFlags(t *testing.T, targetFeatures, clangFeatures string) {
-	t.Helper()
-
-	// Build a set of Clang's features for fast lookup.
-	clangSet := make(map[string]bool) // feature name -> enabled
-	for _, f := range strings.Split(clangFeatures, ",") {
-		f = strings.TrimSpace(f)
-		if len(f) < 2 {
-			continue
-		}
-		enabled := f[0] == '+'
-		name := f[1:]
-		clangSet[name] = enabled
-	}
-
-	// Check each feature that TinyGo specifies.
-	var missing, conflicts []string
-	for _, f := range strings.Split(targetFeatures, ",") {
-		f = strings.TrimSpace(f)
-		if len(f) < 2 {
-			continue
-		}
-		wantEnabled := f[0] == '+'
-		name := f[1:]
-
-		clangEnabled, inClang := clangSet[name]
-		if wantEnabled && (!inClang || !clangEnabled) {
-			// TinyGo requires +feature but Clang doesn't enable it.
-			missing = append(missing, f)
-		} else if !wantEnabled && inClang && clangEnabled {
-			// TinyGo requires -feature but Clang enables it.
-			conflicts = append(conflicts, fmt.Sprintf("target has %q but Clang has %q", f, "+"+name))
-		}
-	}
-
-	if len(missing) > 0 {
-		t.Errorf("target specifies features not present in Clang output: %s\n\ttarget features: %s\n\tclang features:  %s",
-			strings.Join(missing, ", "), targetFeatures, clangFeatures)
-	}
-	if len(conflicts) > 0 {
-		t.Errorf("target disables features that Clang enables: %s",
-			strings.Join(conflicts, "; "))
-	}
-}
-
 // This TestMain is necessary because TinyGo may also be invoked to run certain
 // LLVM tools in a separate process. Not capturing these invocations would lead
 // to recursive tests.

builder/buildid.go

@@ -77,15 +77,6 @@ func ReadBuildID() ([]byte, error) {
 			}
 			return raw[4:], nil
 		}
-
-		// Normally we would have found a build ID by now. But not on Nix,
-		// unfortunately, because Nix adds -no_uuid for some reason:
-		// https://github.com/NixOS/nixpkgs/issues/178366
-		// Fall back to the same implementation that we use for Windows.
-		id, err := readRawGoBuildID(f, 32*1024)
-		if len(id) != 0 || err != nil {
-			return id, err
-		}
 	default:
 		// On other platforms (such as Windows) there isn't such a convenient
 		// build ID. Luckily, Go does have an equivalent of the build ID, which
@@ -97,31 +88,16 @@ func ReadBuildID() ([]byte, error) {
 		// directly. Luckily the build ID is always at the start of the file.
 		// For details, see:
 		// https://github.com/golang/go/blob/master/src/cmd/internal/buildid/buildid.go
-		id, err := readRawGoBuildID(f, 4096)
-		if len(id) != 0 || err != nil {
-			return id, err
+		fileStart := make([]byte, 4096)
+		_, err := io.ReadFull(f, fileStart)
+		index := bytes.Index(fileStart, []byte("\xff Go build ID: \""))
+		if index < 0 || index > len(fileStart)-103 {
+			return nil, fmt.Errorf("could not find build id in %s", err)
+		}
+		buf := fileStart[index : index+103]
+		if bytes.HasPrefix(buf, []byte("\xff Go build ID: \"")) && bytes.HasSuffix(buf, []byte("\"\n \xff")) {
+			return buf[len("\xff Go build ID: \"") : len(buf)-1], nil
 		}
 	}
-	return nil, fmt.Errorf("could not find build ID in %v", executable)
-}
-
-// The Go toolchain stores a build ID in the binary that we can use, as a
-// fallback if binary file specific build IDs can't be obtained.
-// This function reads that build ID from the binary.
-func readRawGoBuildID(f *os.File, prefixSize int) ([]byte, error) {
-	fileStart := make([]byte, prefixSize)
-	_, err := io.ReadFull(f, fileStart)
-	if err != nil {
-		return nil, fmt.Errorf("could not read build id from %s: %v", f.Name(), err)
-	}
-	index := bytes.Index(fileStart, []byte("\xff Go build ID: \""))
-	if index < 0 || index > len(fileStart)-103 {
-		return nil, fmt.Errorf("could not find build id in %s", f.Name())
-	}
-	buf := fileStart[index : index+103]
-	if bytes.HasPrefix(buf, []byte("\xff Go build ID: \"")) && bytes.HasSuffix(buf, []byte("\"\n \xff")) {
-		return buf[len("\xff Go build ID: \"") : len(buf)-1], nil
-	}
-
-	return nil, nil
+	return nil, fmt.Errorf("could not find build ID in %s", executable)
 }

builder/builtins.go

@@ -5,18 +5,17 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
 )
 
-// These are the GENERIC_SOURCES according to CMakeList.txt except for
-// divmodsi4.c and udivmodsi4.c.
+// These are the GENERIC_SOURCES according to CMakeList.txt.
 var genericBuiltins = []string{
 	"absvdi2.c",
 	"absvsi2.c",
 	"absvti2.c",
 	"adddf3.c",
 	"addsf3.c",
+	"addtf3.c",
 	"addvdi3.c",
 	"addvsi3.c",
 	"addvti3.c",
@@ -41,12 +40,12 @@ var genericBuiltins = []string{
 	"divdf3.c",
 	"divdi3.c",
 	"divmoddi4.c",
-	//"divmodsi4.c",
-	"divmodti4.c",
 	"divsc3.c",
 	"divsf3.c",
 	"divsi3.c",
+	"divtc3.c",
 	"divti3.c",
+	"divtf3.c",
 	"extendsfdf2.c",
 	"extendhfsf2.c",
 	"ffsdi2.c",
@@ -92,6 +91,7 @@ var genericBuiltins = []string{
 	"mulsc3.c",
 	"mulsf3.c",
 	"multi3.c",
+	"multf3.c",
 	"mulvdi3.c",
 	"mulvsi3.c",
 	"mulvti3.c",
@@ -111,11 +111,13 @@ var genericBuiltins = []string{
 	"popcountti2.c",
 	"powidf2.c",
 	"powisf2.c",
+	"powitf2.c",
 	"subdf3.c",
 	"subsf3.c",
 	"subvdi3.c",
 	"subvsi3.c",
 	"subvti3.c",
+	"subtf3.c",
 	"trampoline_setup.c",
 	"truncdfhf2.c",
 	"truncdfsf2.c",
@@ -124,7 +126,6 @@ var genericBuiltins = []string{
 	"ucmpti2.c",
 	"udivdi3.c",
 	"udivmoddi4.c",
-	//"udivmodsi4.c",
 	"udivmodti4.c",
 	"udivsi3.c",
 	"udivti3.c",
@@ -133,38 +134,6 @@ var genericBuiltins = []string{
 	"umodti3.c",
 }
 
-// These are the GENERIC_TF_SOURCES as of LLVM 18.
-// They are not needed on all platforms (32-bit platforms usually don't need
-// these) but they seem to compile fine so it's easier to include them.
-var genericBuiltins128 = []string{
-	"addtf3.c",
-	"comparetf2.c",
-	"divtc3.c",
-	"divtf3.c",
-	"extenddftf2.c",
-	"extendhftf2.c",
-	"extendsftf2.c",
-	"fixtfdi.c",
-	"fixtfsi.c",
-	"fixtfti.c",
-	"fixunstfdi.c",
-	"fixunstfsi.c",
-	"fixunstfti.c",
-	"floatditf.c",
-	"floatsitf.c",
-	"floattitf.c",
-	"floatunditf.c",
-	"floatunsitf.c",
-	"floatuntitf.c",
-	"multc3.c",
-	"multf3.c",
-	"powitf2.c",
-	"subtf3.c",
-	"trunctfdf2.c",
-	"trunctfhf2.c",
-	"trunctfsf2.c",
-}
-
 var aeabiBuiltins = []string{
 	"arm/aeabi_cdcmp.S",
 	"arm/aeabi_cdcmpeq_check_nan.c",
@@ -202,28 +171,12 @@ var avrBuiltins = []string{
 	"avr/udivmodqi4.S",
 }
 
-// Builtins needed specifically for windows/386.
-var windowsI386Builtins = []string{
-	"i386/chkstk.S",  // __chkstk_ms
-	"i386/chkstk2.S", // _alloca (__alloca)
-}
-
-// Builtins needed specifically for windows/amd64.
-var windowsAMD64Builtins = []string{
-	"x86_64/chkstk.S",
-}
-
-// Builtins needed specifically for windows/arm64.
-var windowsARM64Builtins = []string{
-	"aarch64/chkstk.S",
-}
-
-// libCompilerRT is a library with symbols required by programs compiled with
-// LLVM. These symbols are for operations that cannot be emitted with a single
+// CompilerRT is a library with symbols required by programs compiled with LLVM.
+// These symbols are for operations that cannot be emitted with a single
 // instruction or a short sequence of instructions for that target.
 //
 // For more information, see: https://compiler-rt.llvm.org/
-var libCompilerRT = Library{
+var CompilerRT = Library{
 	name: "compiler-rt",
 	cflags: func(target, headerPath string) []string {
 		return []string{"-Werror", "-Wall", "-std=c11", "-nostdlibinc"}
@@ -237,35 +190,14 @@ var libCompilerRT = Library{
 		// Development build.
 		return filepath.Join(goenv.Get("TINYGOROOT"), "lib/compiler-rt-builtins")
 	},
-	librarySources: func(target string, _ bool) ([]string, error) {
+	librarySources: func(target string) ([]string, error) {
 		builtins := append([]string{}, genericBuiltins...) // copy genericBuiltins
-		switch compileopts.CanonicalArchName(target) {
-		case "arm":
+		if strings.HasPrefix(target, "arm") || strings.HasPrefix(target, "thumb") {
 			builtins = append(builtins, aeabiBuiltins...)
-		case "avr":
+		}
+		if strings.HasPrefix(target, "avr") {
 			builtins = append(builtins, avrBuiltins...)
-		case "x86_64":
-			builtins = append(builtins, genericBuiltins128...)
-			if isWindowsTriple(target) {
-				builtins = append(builtins, windowsAMD64Builtins...)
-			}
-		case "aarch64":
-			builtins = append(builtins, genericBuiltins128...)
-			if isWindowsTriple(target) {
-				builtins = append(builtins, windowsARM64Builtins...)
-			}
-		case "riscv64":
-			builtins = append(builtins, genericBuiltins128...)
-		case "i386":
-			if isWindowsTriple(target) {
-				builtins = append(builtins, windowsI386Builtins...)
-			}
 		}
 		return builtins, nil
 	},
 }
-
-func isWindowsTriple(target string) bool {
-	parts := strings.Split(target, "-")
-	return len(parts) > 2 && parts[2] == "windows"
-}

builder/cc.go

@@ -56,7 +56,7 @@ import (
 //     depfile but without invalidating its name. For this reason, the depfile is
 //     written on each new compilation (even when it seems unnecessary). However, it
 //     could in rare cases lead to a stale file fetched from the cache.
-func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands func(string, ...string)) (string, error) {
+func compileAndCacheCFile(abspath, tmpdir string, cflags []string, thinlto bool, printCommands func(string, ...string)) (string, error) {
 	// Hash input file.
 	fileHash, err := hashFile(abspath)
 	if err != nil {
@@ -67,6 +67,11 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 	unlock := lock(filepath.Join(goenv.Get("GOCACHE"), fileHash+".c.lock"))
 	defer unlock()
 
+	ext := ".o"
+	if thinlto {
+		ext = ".bc"
+	}
+
 	// Create cache key for the dependencies file.
 	buf, err := json.Marshal(struct {
 		Path        string
@@ -99,7 +104,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 		}
 
 		// Obtain hashes of all the files listed as a dependency.
-		outpath, err := makeCFileCachePath(dependencies, depfileNameHash)
+		outpath, err := makeCFileCachePath(dependencies, depfileNameHash, ext)
 		if err == nil {
 			if _, err := os.Stat(outpath); err == nil {
 				return outpath, nil
@@ -112,7 +117,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 		return "", err
 	}
 
-	objTmpFile, err := os.CreateTemp(goenv.Get("GOCACHE"), "tmp-*.bc")
+	objTmpFile, err := os.CreateTemp(goenv.Get("GOCACHE"), "tmp-*"+ext)
 	if err != nil {
 		return "", err
 	}
@@ -122,8 +127,11 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 		return "", err
 	}
 	depTmpFile.Close()
-	flags := append([]string{}, cflags...)                                                 // copy cflags
-	flags = append(flags, "-MD", "-MV", "-MTdeps", "-MF", depTmpFile.Name(), "-flto=thin") // autogenerate dependencies
+	flags := append([]string{}, cflags...)                                   // copy cflags
+	flags = append(flags, "-MD", "-MV", "-MTdeps", "-MF", depTmpFile.Name()) // autogenerate dependencies
+	if thinlto {
+		flags = append(flags, "-flto=thin")
+	}
 	flags = append(flags, "-c", "-o", objTmpFile.Name(), abspath)
 	if strings.ToLower(filepath.Ext(abspath)) == ".s" {
 		// If this is an assembly file (.s or .S, lowercase or uppercase), then
@@ -181,7 +189,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 	}
 
 	// Move temporary object file to final location.
-	outpath, err := makeCFileCachePath(dependencySlice, depfileNameHash)
+	outpath, err := makeCFileCachePath(dependencySlice, depfileNameHash, ext)
 	if err != nil {
 		return "", err
 	}
@@ -196,7 +204,7 @@ func compileAndCacheCFile(abspath, tmpdir string, cflags []string, printCommands
 // Create a cache path (a path in GOCACHE) to store the output of a compiler
 // job. This path is based on the dep file name (which is a hash of metadata
 // including compiler flags) and the hash of all input files in the paths slice.
-func makeCFileCachePath(paths []string, depfileNameHash string) (string, error) {
+func makeCFileCachePath(paths []string, depfileNameHash, ext string) (string, error) {
 	// Hash all input files.
 	fileHashes := make(map[string]string, len(paths))
 	for _, path := range paths {
@@ -221,7 +229,7 @@ func makeCFileCachePath(paths []string, depfileNameHash string) (string, error)
 	outFileNameBuf := sha512.Sum512_224(buf)
 	cacheKey := hex.EncodeToString(outFileNameBuf[:])
 
-	outpath := filepath.Join(goenv.Get("GOCACHE"), "obj-"+cacheKey+".bc")
+	outpath := filepath.Join(goenv.Get("GOCACHE"), "obj-"+cacheKey+ext)
 	return outpath, nil
 }
 
@@ -281,7 +289,7 @@ func parseDepFile(s string) ([]string, error) {
 	s = strings.ReplaceAll(s, "\\\n", " ")
 
 	// Only use the first line, which is expected to begin with "deps:".
-	line, _, _ := strings.Cut(s, "\n")
+	line := strings.SplitN(s, "\n", 2)[0]
 	if !strings.HasPrefix(line, "deps:") {
 		return nil, errors.New("readDepFile: expected 'deps:' prefix")
 	}

builder/cc1as.cpp

@@ -1,12 +1,5 @@
 //go:build byollvm
 
-// Source: https://github.com/llvm/llvm-project/blob/main/clang/tools/driver/cc1as_main.cpp
-// This file needs to be updated each LLVM release.
-// There are a few small modifications to make, like:
-//   * ExecuteAssembler is made non-static.
-//   * The struct AssemblerImplementation is moved to cc1as.h so it can be
-//     included elsewhere.
-
 //===-- cc1as.cpp - Clang Assembler  --------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -23,19 +16,18 @@
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Driver/DriverDiagnostic.h"
-#include "clang/Options/Options.h"
+#include "clang/Driver/Options.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/MC/MCAsmBackend.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCCodeEmitter.h"
 #include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCObjectWriter.h"
@@ -54,6 +46,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
@@ -62,13 +55,11 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/TargetParser/Host.h"
-#include "llvm/TargetParser/Triple.h"
 #include <memory>
-#include <optional>
 #include <system_error>
 using namespace clang;
-using namespace clang::options;
+using namespace clang::driver;
+using namespace clang::driver::options;
 using namespace llvm;
 using namespace llvm::opt;
 
@@ -82,10 +73,10 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   // Parse the arguments.
   const OptTable &OptTbl = getDriverOptTable();
 
-  llvm::opt::Visibility VisibilityMask(options::CC1AsOption);
+  const unsigned IncludedFlagsBitmask = options::CC1AsOption;
   unsigned MissingArgIndex, MissingArgCount;
-  InputArgList Args =
-      OptTbl.ParseArgs(Argv, MissingArgIndex, MissingArgCount, VisibilityMask);
+  InputArgList Args = OptTbl.ParseArgs(Argv, MissingArgIndex, MissingArgCount,
+                                       IncludedFlagsBitmask);
 
   // Check for missing argument error.
   if (MissingArgCount) {
@@ -98,7 +89,7 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
     auto ArgString = A->getAsString(Args);
     std::string Nearest;
-    if (OptTbl.findNearest(ArgString, Nearest, VisibilityMask) > 1)
+    if (OptTbl.findNearest(ArgString, Nearest, IncludedFlagsBitmask) > 1)
       Diags.Report(diag::err_drv_unknown_argument) << ArgString;
     else
       Diags.Report(diag::err_drv_unknown_argument_with_suggestion)
@@ -109,24 +100,16 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   // Construct the invocation.
 
   // Target Options
-  Opts.Triple = llvm::Triple(llvm::Triple::normalize(Args.getLastArgValue(OPT_triple)));
+  Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
   if (Arg *A = Args.getLastArg(options::OPT_darwin_target_variant_triple))
     Opts.DarwinTargetVariantTriple = llvm::Triple(A->getValue());
-  if (Arg *A = Args.getLastArg(OPT_darwin_target_variant_sdk_version_EQ)) {
-    VersionTuple Version;
-    if (Version.tryParse(A->getValue()))
-      Diags.Report(diag::err_drv_invalid_value)
-          << A->getAsString(Args) << A->getValue();
-    else
-      Opts.DarwinTargetVariantSDKVersion = Version;
-  }
 
   Opts.CPU = std::string(Args.getLastArgValue(OPT_target_cpu));
   Opts.Features = Args.getAllArgValues(OPT_target_feature);
 
   // Use the default target triple if unspecified.
-  if (Opts.Triple.getTriple().empty())
-    Opts.Triple = llvm::Triple(llvm::sys::getDefaultTargetTriple());
+  if (Opts.Triple.empty())
+    Opts.Triple = llvm::sys::getDefaultTargetTriple();
 
   // Language Options
   Opts.IncludePaths = Args.getAllArgValues(OPT_I);
@@ -139,11 +122,11 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
     Opts.CompressDebugSections =
         llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
             .Case("none", llvm::DebugCompressionType::None)
-            .Case("zlib", llvm::DebugCompressionType::Zlib)
-            .Case("zstd", llvm::DebugCompressionType::Zstd)
+            .Case("zlib", llvm::DebugCompressionType::Z)
             .Default(llvm::DebugCompressionType::None);
   }
 
+  Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
   if (auto *DwarfFormatArg = Args.getLastArg(OPT_gdwarf64, OPT_gdwarf32))
     Opts.Dwarf64 = DwarfFormatArg->getOption().matches(OPT_gdwarf64);
   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 2, Diags);
@@ -158,7 +141,8 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
 
   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ)) {
     auto Split = StringRef(Arg).split('=');
-    Opts.DebugPrefixMap.emplace_back(Split.first, Split.second);
+    Opts.DebugPrefixMap.insert(
+        {std::string(Split.first), std::string(Split.second)});
   }
 
   // Frontend Options
@@ -205,7 +189,6 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
   Opts.NoWarn = Args.hasArg(OPT_massembler_no_warn);
-  Opts.NoTypeCheck = Args.hasArg(OPT_mno_type_check);
   Opts.RelocationModel =
       std::string(Args.getLastArgValue(OPT_mrelocation_model, "pic"));
   Opts.TargetABI = std::string(Args.getLastArgValue(OPT_target_abi));
@@ -231,15 +214,6 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
             .Case("default", EmitDwarfUnwindType::Default);
   }
 
-  Opts.EmitCompactUnwindNonCanonical =
-      Args.hasArg(OPT_femit_compact_unwind_non_canonical);
-  Opts.Crel = Args.hasArg(OPT_crel);
-  Opts.ImplicitMapsyms = Args.hasArg(OPT_mmapsyms_implicit);
-  Opts.X86RelaxRelocations = !Args.hasArg(OPT_mrelax_relocations_no);
-  Opts.X86Sse2Avx = Args.hasArg(OPT_msse2avx);
-
-  Opts.AsSecureLogFile = Args.getLastArgValue(OPT_as_secure_log_file);
-
   return Success;
 }
 
@@ -267,14 +241,14 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
   std::string Error;
   const Target *TheTarget = TargetRegistry::lookupTarget(Opts.Triple, Error);
   if (!TheTarget)
-    return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple.str();
+    return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
 
   ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer =
       MemoryBuffer::getFileOrSTDIN(Opts.InputFile, /*IsText=*/true);
 
   if (std::error_code EC = Buffer.getError()) {
-    return Diags.Report(diag::err_fe_error_reading)
-           << Opts.InputFile << EC.message();
+    Error = EC.message();
+    return Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
   }
 
   SourceMgr SrcMgr;
@@ -290,16 +264,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
   assert(MRI && "Unable to create target register info!");
 
   MCTargetOptions MCOptions;
-  MCOptions.MCRelaxAll = Opts.RelaxAll;
   MCOptions.EmitDwarfUnwind = Opts.EmitDwarfUnwind;
-  MCOptions.EmitCompactUnwindNonCanonical = Opts.EmitCompactUnwindNonCanonical;
-  MCOptions.MCSaveTempLabels = Opts.SaveTemporaryLabels;
-  MCOptions.Crel = Opts.Crel;
-  MCOptions.ImplicitMapSyms = Opts.ImplicitMapsyms;
-  MCOptions.X86RelaxRelocations = Opts.X86RelaxRelocations;
-  MCOptions.X86Sse2Avx = Opts.X86Sse2Avx;
-  MCOptions.CompressDebugSections = Opts.CompressDebugSections;
-  MCOptions.AsSecureLogFile = Opts.AsSecureLogFile;
 
   std::unique_ptr<MCAsmInfo> MAI(
       TheTarget->createMCAsmInfo(*MRI, Opts.Triple, MCOptions));
@@ -307,7 +272,9 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
 
   // Ensure MCAsmInfo initialization occurs before any use, otherwise sections
   // may be created with a combination of default and explicit settings.
+  MAI->setCompressDebugSections(Opts.CompressDebugSections);
 
+  MAI->setRelaxELFRelocations(Opts.RelaxELFRelocations);
 
   bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
   if (Opts.OutputPath.empty())
@@ -327,7 +294,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
       TheTarget->createMCSubtargetInfo(Opts.Triple, Opts.CPU, FS));
   assert(STI && "Unable to create subtarget info!");
 
-  MCContext Ctx(Opts.Triple, MAI.get(), MRI.get(), STI.get(), &SrcMgr,
+  MCContext Ctx(Triple(Opts.Triple), MAI.get(), MRI.get(), STI.get(), &SrcMgr,
                 &MCOptions);
 
   bool PIC = false;
@@ -345,8 +312,12 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
   // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
   std::unique_ptr<MCObjectFileInfo> MOFI(
       TheTarget->createMCObjectFileInfo(Ctx, PIC));
+  if (Opts.DarwinTargetVariantTriple)
+    MOFI->setDarwinTargetVariantTriple(*Opts.DarwinTargetVariantTriple);
   Ctx.setObjectFileInfo(MOFI.get());
 
+  if (Opts.SaveTemporaryLabels)
+    Ctx.setAllowTemporaryLabels(false);
   if (Opts.GenDwarfForAssembly)
     Ctx.setGenDwarfForAssembly(true);
   if (!Opts.DwarfDebugFlags.empty())
@@ -382,16 +353,12 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
 
   MCOptions.MCNoWarn = Opts.NoWarn;
   MCOptions.MCFatalWarnings = Opts.FatalWarnings;
-  MCOptions.MCNoTypeCheck = Opts.NoTypeCheck;
-  MCOptions.ShowMCInst = Opts.ShowInst;
-  MCOptions.AsmVerbose = true;
-  MCOptions.MCUseDwarfDirectory = MCTargetOptions::EnableDwarfDirectory;
   MCOptions.ABIName = Opts.TargetABI;
 
   // FIXME: There is a bit of code duplication with addPassesToEmitFile.
   if (Opts.OutputType == AssemblerInvocation::FT_Asm) {
-    std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
-        Opts.Triple, Opts.OutputAsmVariant, *MAI, *MCII, *MRI));
+    MCInstPrinter *IP = TheTarget->createMCInstPrinter(
+        llvm::Triple(Opts.Triple), Opts.OutputAsmVariant, *MAI, *MCII, *MRI);
 
     std::unique_ptr<MCCodeEmitter> CE;
     if (Opts.ShowEncoding)
@@ -400,8 +367,10 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
         TheTarget->createMCAsmBackend(*STI, *MRI, MCOptions));
 
     auto FOut = std::make_unique<formatted_raw_ostream>(*Out);
-    Str.reset(TheTarget->createAsmStreamer(Ctx, std::move(FOut), std::move(IP),
-                                           std::move(CE), std::move(MAB)));
+    Str.reset(TheTarget->createAsmStreamer(
+        Ctx, std::move(FOut), /*asmverbose*/ true,
+        /*useDwarfDirectory*/ true, IP, std::move(CE), std::move(MAB),
+        Opts.ShowInst));
   } else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
     Str.reset(createNullStreamer(Ctx));
   } else {
@@ -422,17 +391,12 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
         DwoOS ? MAB->createDwoObjectWriter(*Out, *DwoOS)
               : MAB->createObjectWriter(*Out);
 
-    Triple T = Opts.Triple;
+    Triple T(Opts.Triple);
     Str.reset(TheTarget->createMCObjectStreamer(
-        T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI));
+        T, Ctx, std::move(MAB), std::move(OW), std::move(CE), *STI,
+        Opts.RelaxAll, Opts.IncrementalLinkerCompatible,
+        /*DWARFMustBeAtTheEnd*/ true));
     Str.get()->initSections(Opts.NoExecStack, *STI);
-    if (T.isOSBinFormatMachO() && T.isOSDarwin()) {
-      Triple *TVT = Opts.DarwinTargetVariantTriple
-                        ? &*Opts.DarwinTargetVariantTriple
-                        : nullptr;
-      Str->emitVersionForTarget(T, VersionTuple(), TVT,
-                                Opts.DarwinTargetVariantSDKVersion);
-    }
   }
 
   // When -fembed-bitcode is passed to clang_as, a 1-byte marker
@@ -444,6 +408,9 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
     Str.get()->emitZeros(1);
   }
 
+  // Assembly to object compilation should leverage assembly info.
+  Str->setUseAssemblerInfoForParsing(true);
+
   bool Failed = false;
 
   std::unique_ptr<MCAsmParser> Parser(
@@ -453,7 +420,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
   std::unique_ptr<MCTargetAsmParser> TAP(
       TheTarget->createMCAsmParser(*STI, *Parser, *MCII, MCOptions));
   if (!TAP)
-    Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple.str();
+    Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
 
   // Set values for symbols, if any.
   for (auto &S : Opts.SymbolDefs) {
@@ -506,12 +473,12 @@ int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
   InitializeAllAsmParsers();
 
   // Construct our diagnostic client.
-  DiagnosticOptions DiagOpts;
+  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   TextDiagnosticPrinter *DiagClient
-    = new TextDiagnosticPrinter(errs(), DiagOpts);
+    = new TextDiagnosticPrinter(errs(), &*DiagOpts);
   DiagClient->setPrefix("clang -cc1as");
   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
-  DiagnosticsEngine Diags(DiagID, DiagOpts, DiagClient);
+  DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
 
   // Set an error handler, so that any LLVM backend diagnostics go through our
   // error handler.
@@ -526,10 +493,9 @@ int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
   if (Asm.ShowHelp) {
     getDriverOptTable().printHelp(
         llvm::outs(), "clang -cc1as [options] file...",
-        "Clang Integrated Assembler", /*ShowHidden=*/false,
-        /*ShowAllAliases=*/false,
-        llvm::opt::Visibility(clang::options::CC1AsOption));
-
+        "Clang Integrated Assembler",
+        /*Include=*/driver::options::CC1AsOption, /*Exclude=*/0,
+        /*ShowAllAliases=*/false);
     return 0;
   }
 

builder/cc1as.h

@@ -1,6 +1,3 @@
-// Source: https://github.com/llvm/llvm-project/blob/main/clang/tools/driver/cc1as_main.cpp
-// See cc1as.cpp for details.
-
 //===-- cc1as.h - Clang Assembler  ----------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
@@ -20,7 +17,7 @@ struct AssemblerInvocation {
   /// @{
 
   /// The name of the target triple to assemble for.
-  llvm::Triple Triple;
+  std::string Triple;
 
   /// If given, the name of the target CPU to determine which instructions
   /// are legal.
@@ -38,19 +35,16 @@ struct AssemblerInvocation {
   /// @{
 
   std::vector<std::string> IncludePaths;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned NoInitialTextSection : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned SaveTemporaryLabels : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned GenDwarfForAssembly : 1;
-  LLVM_PREFERRED_TYPE(bool)
+  unsigned RelaxELFRelocations : 1;
   unsigned Dwarf64 : 1;
   unsigned DwarfVersion;
   std::string DwarfDebugFlags;
   std::string DwarfDebugProducer;
   std::string DebugCompilationDir;
-  llvm::SmallVector<std::pair<std::string, std::string>, 0> DebugPrefixMap;
+  std::map<const std::string, const std::string> DebugPrefixMap;
   llvm::DebugCompressionType CompressDebugSections =
       llvm::DebugCompressionType::None;
   std::string MainFileName;
@@ -69,9 +63,7 @@ struct AssemblerInvocation {
     FT_Obj   ///< Object file output.
   };
   FileType OutputType;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned ShowHelp : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned ShowVersion : 1;
 
   /// @}
@@ -79,48 +71,23 @@ struct AssemblerInvocation {
   /// @{
 
   unsigned OutputAsmVariant;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned ShowEncoding : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned ShowInst : 1;
 
   /// @}
   /// @name Assembler Options
   /// @{
 
-  LLVM_PREFERRED_TYPE(bool)
   unsigned RelaxAll : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned NoExecStack : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned FatalWarnings : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned NoWarn : 1;
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned NoTypeCheck : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned IncrementalLinkerCompatible : 1;
-  LLVM_PREFERRED_TYPE(bool)
   unsigned EmbedBitcode : 1;
 
   /// Whether to emit DWARF unwind info.
   EmitDwarfUnwindType EmitDwarfUnwind;
 
-  // Whether to emit compact-unwind for non-canonical entries.
-  // Note: maybe overridden by other constraints.
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned EmitCompactUnwindNonCanonical : 1;
-
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned Crel : 1;
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned ImplicitMapsyms : 1;
-
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned X86RelaxRelocations : 1;
-  LLVM_PREFERRED_TYPE(bool)
-  unsigned X86Sse2Avx : 1;
-
   /// The name of the relocation model to use.
   std::string RelocationModel;
 
@@ -130,19 +97,12 @@ struct AssemblerInvocation {
 
   /// Darwin target variant triple, the variant of the deployment target
   /// for which the code is being compiled.
-  std::optional<llvm::Triple> DarwinTargetVariantTriple;
-
-  /// The version of the darwin target variant SDK which was used during the
-  /// compilation
-  llvm::VersionTuple DarwinTargetVariantSDKVersion;
-
-  /// The name of a file to use with \c .secure_log_unique directives.
-  std::string AsSecureLogFile;
+  llvm::Optional<llvm::Triple> DarwinTargetVariantTriple;
   /// @}
 
 public:
   AssemblerInvocation() {
-    Triple = llvm::Triple();
+    Triple = "";
     NoInitialTextSection = 0;
     InputFile = "-";
     OutputPath = "-";
@@ -154,17 +114,11 @@ public:
     NoExecStack = 0;
     FatalWarnings = 0;
     NoWarn = 0;
-    NoTypeCheck = 0;
     IncrementalLinkerCompatible = 0;
     Dwarf64 = 0;
     DwarfVersion = 0;
     EmbedBitcode = 0;
     EmitDwarfUnwind = EmitDwarfUnwindType::Default;
-    EmitCompactUnwindNonCanonical = false;
-    Crel = false;
-    ImplicitMapsyms = 0;
-    X86RelaxRelocations = 0;
-    X86Sse2Avx = 0;
   }
 
   static bool CreateFromArgs(AssemblerInvocation &Res,

builder/clang.cpp

@@ -11,7 +11,7 @@
 #include <clang/FrontendTool/Utils.h>
 #include <llvm/ADT/IntrusiveRefCntPtr.h>
 #include <llvm/Option/Option.h>
-#include <llvm/TargetParser/Host.h>
+#include <llvm/Support/Host.h>
 
 using namespace llvm;
 using namespace clang;
@@ -27,9 +27,9 @@ bool tinygo_clang_driver(int argc, char **argv) {
 	std::vector<const char*> args(argv, argv + argc);
 
 	// The compiler invocation needs a DiagnosticsEngine so it can report problems
-	clang::DiagnosticOptions DiagOpts;
-	clang::TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), DiagOpts);
-	clang::DiagnosticsEngine Diags(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(new clang::DiagnosticIDs()), DiagOpts, &DiagnosticPrinter, false);
+	llvm::IntrusiveRefCntPtr<clang::DiagnosticOptions> DiagOpts = new clang::DiagnosticOptions();
+	clang::TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), &*DiagOpts);
+	clang::DiagnosticsEngine Diags(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(new clang::DiagnosticIDs()), &*DiagOpts, &DiagnosticPrinter, false);
 
 	// Create the clang driver
 	clang::driver::Driver TheDriver(args[0], llvm::sys::getDefaultTargetTriple(), Diags);

builder/commands.go

@@ -3,6 +3,7 @@ package builder
 import (
 	"errors"
 	"fmt"
+	"os"
 	"os/exec"
 	"runtime"
 	"strings"
@@ -17,7 +18,7 @@ import (
 var commands = map[string][]string{}
 
 func init() {
-	llvmMajor, _, _ := strings.Cut(llvm.Version, ".")
+	llvmMajor := strings.Split(llvm.Version, ".")[0]
 	commands["clang"] = []string{"clang-" + llvmMajor}
 	commands["ld.lld"] = []string{"ld.lld-" + llvmMajor, "ld.lld"}
 	commands["wasm-ld"] = []string{"wasm-ld-" + llvmMajor, "wasm-ld"}
@@ -75,3 +76,14 @@ func LookupCommand(name string) (string, error) {
 	}
 	return "", errors.New("none of these commands were found in your $PATH: " + strings.Join(commands[name], " "))
 }
+
+func execCommand(name string, args ...string) error {
+	name, err := LookupCommand(name)
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command(name, args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}

builder/config.go

@@ -1,8 +1,8 @@
 package builder
 
 import (
+	"errors"
 	"fmt"
-	"runtime"
 
 	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
@@ -24,40 +24,26 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 		spec.OpenOCDCommands = options.OpenOCDCommands
 	}
 
-	// Version range supported by TinyGo.
-	const minorMin = 25 // when updating the min version, also update .github/workflows/compat.yml
-	const minorMax = 27
+	goroot := goenv.Get("GOROOT")
+	if goroot == "" {
+		return nil, errors.New("cannot locate $GOROOT, please set it manually")
+	}
 
-	// Check that we support this Go toolchain version.
-	gorootMajor, gorootMinor, err := goenv.GetGorootVersion()
+	major, minor, err := goenv.GetGorootVersion(goroot)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("could not read version from GOROOT (%v): %v", goroot, err)
+	}
+	if major != 1 || minor < 18 || minor > 20 {
+		return nil, fmt.Errorf("requires go version 1.18 through 1.20, got go%d.%d", major, minor)
 	}
 
-	if options.GoCompatibility {
-		if gorootMajor != 1 || gorootMinor < minorMin || gorootMinor > minorMax {
-			// Note: when this gets updated, also update the Go compatibility matrix:
-			// https://github.com/tinygo-org/tinygo-site/blob/dev/content/docs/reference/go-compat-matrix.md
-			return nil, fmt.Errorf("requires go version 1.%d through 1.%d, got go%d.%d", minorMin, minorMax, gorootMajor, gorootMinor)
-		}
-	}
-
-	// Check that the Go toolchain version isn't too new, if we haven't been
-	// compiled with the latest Go version.
-	// This may be a bit too aggressive: if the newer version doesn't change the
-	// Go language we will most likely be able to compile it.
-	buildMajor, buildMinor, _, err := goenv.Parse(runtime.Version())
-	if err != nil {
-		return nil, err
-	}
-	if buildMajor != 1 || buildMinor < gorootMinor {
-		return nil, fmt.Errorf("cannot compile with Go toolchain version go%d.%d (TinyGo was built using toolchain version %s)", gorootMajor, gorootMinor, runtime.Version())
-	}
+	clangHeaderPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
 
 	return &compileopts.Config{
 		Options:        options,
 		Target:         spec,
-		GoMinorVersion: gorootMinor,
+		GoMinorVersion: minor,
+		ClangHeaders:   clangHeaderPath,
 		TestConfig:     options.TestConfig,
 	}, nil
 }

builder/darwin-libsystem.go

@@ -15,7 +15,7 @@ func makeDarwinLibSystemJob(config *compileopts.Config, tmpdir string) *compileJ
 	return &compileJob{
 		description: "compile Darwin libSystem.dylib",
 		run: func(job *compileJob) (err error) {
-			arch, _, _ := strings.Cut(config.Triple(), "-")
+			arch := strings.Split(config.Triple(), "-")[0]
 			job.result = filepath.Join(tmpdir, "libSystem.dylib")
 			objpath := filepath.Join(tmpdir, "libSystem.o")
 			inpath := filepath.Join(goenv.Get("TINYGOROOT"), "lib/macos-minimal-sdk/src", arch, "libSystem.s")

builder/env.go

@@ -0,0 +1,105 @@
+package builder
+
+import (
+	"errors"
+	"io/fs"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"tinygo.org/x/go-llvm"
+)
+
+// getClangHeaderPath returns the path to the built-in Clang headers. It tries
+// multiple locations, which should make it find the directory when installed in
+// various ways.
+func getClangHeaderPath(TINYGOROOT string) string {
+	// Check whether we're running from the source directory.
+	path := filepath.Join(TINYGOROOT, "llvm-project", "clang", "lib", "Headers")
+	if _, err := os.Stat(path); !errors.Is(err, fs.ErrNotExist) {
+		return path
+	}
+
+	// Check whether we're running from the installation directory.
+	path = filepath.Join(TINYGOROOT, "lib", "clang", "include")
+	if _, err := os.Stat(path); !errors.Is(err, fs.ErrNotExist) {
+		return path
+	}
+
+	// It looks like we are built with a system-installed LLVM. Do a last
+	// attempt: try to use Clang headers relative to the clang binary.
+	llvmMajor := strings.Split(llvm.Version, ".")[0]
+	for _, cmdName := range commands["clang"] {
+		binpath, err := exec.LookPath(cmdName)
+		if err == nil {
+			// This should be the command that will also be used by
+			// execCommand. To avoid inconsistencies, make sure we use the
+			// headers relative to this command.
+			binpath, err = filepath.EvalSymlinks(binpath)
+			if err != nil {
+				// Unexpected.
+				return ""
+			}
+			// Example executable:
+			//     /usr/lib/llvm-9/bin/clang
+			// Example include path:
+			//     /usr/lib/llvm-9/lib64/clang/9.0.1/include/
+			llvmRoot := filepath.Dir(filepath.Dir(binpath))
+			clangVersionRoot := filepath.Join(llvmRoot, "lib64", "clang")
+			dirs64, err64 := ioutil.ReadDir(clangVersionRoot)
+			// Example include path:
+			//     /usr/lib/llvm-9/lib/clang/9.0.1/include/
+			clangVersionRoot = filepath.Join(llvmRoot, "lib", "clang")
+			dirs32, err32 := ioutil.ReadDir(clangVersionRoot)
+			if err64 != nil && err32 != nil {
+				// Unexpected.
+				continue
+			}
+			dirnames := make([]string, len(dirs64)+len(dirs32))
+			dirCount := 0
+			for _, d := range dirs32 {
+				name := d.Name()
+				if name == llvmMajor || strings.HasPrefix(name, llvmMajor+".") {
+					dirnames[dirCount] = filepath.Join(llvmRoot, "lib", "clang", name)
+					dirCount++
+				}
+			}
+			for _, d := range dirs64 {
+				name := d.Name()
+				if name == llvmMajor || strings.HasPrefix(name, llvmMajor+".") {
+					dirnames[dirCount] = filepath.Join(llvmRoot, "lib64", "clang", name)
+					dirCount++
+				}
+			}
+			sort.Strings(dirnames)
+			// Check for the highest version first.
+			for i := dirCount - 1; i >= 0; i-- {
+				path := filepath.Join(dirnames[i], "include")
+				_, err := os.Stat(filepath.Join(path, "stdint.h"))
+				if err == nil {
+					return path
+				}
+			}
+		}
+	}
+
+	// On Arch Linux, the clang executable is stored in /usr/bin rather than being symlinked from there.
+	// Search directly in /usr/lib for clang.
+	if matches, err := filepath.Glob("/usr/lib/clang/" + llvmMajor + ".*.*"); err == nil {
+		// Check for the highest version first.
+		sort.Strings(matches)
+		for i := len(matches) - 1; i >= 0; i-- {
+			path := filepath.Join(matches[i], "include")
+			_, err := os.Stat(filepath.Join(path, "stdint.h"))
+			if err == nil {
+				return path
+			}
+		}
+	}
+
+	// Could not find it.
+	return ""
+}

builder/error.go

@@ -3,8 +3,7 @@ package builder
 // MultiError is a list of multiple errors (actually: diagnostics) returned
 // during LLVM IR generation.
 type MultiError struct {
-	ImportPath string
-	Errs       []error
+	Errs []error
 }
 
 func (e *MultiError) Error() string {
@@ -15,16 +14,15 @@ func (e *MultiError) Error() string {
 
 // newMultiError returns a *MultiError if there is more than one error, or
 // returns that error directly when there is only one. Passing an empty slice
-// will return nil (because there is no error).
-// The importPath may be passed if this error is for a single package.
-func newMultiError(errs []error, importPath string) error {
+// will lead to a panic.
+func newMultiError(errs []error) error {
 	switch len(errs) {
 	case 0:
-		return nil
+		panic("attempted to create empty MultiError")
 	case 1:
 		return errs[0]
 	default:
-		return &MultiError{importPath, errs}
+		return &MultiError{errs}
 	}
 }
 

builder/esp.go

@@ -23,7 +23,7 @@ type espImageSegment struct {
 	data []byte
 }
 
-// makeESPFirmwareImage converts an input ELF file to an image file for an ESP32 or
+// makeESPFirmare converts an input ELF file to an image file for an ESP32 or
 // ESP8266 chip. This is a special purpose image format just for the ESP chip
 // family, and is parsed by the on-chip mask ROM bootloader.
 //
@@ -31,7 +31,7 @@ type espImageSegment struct {
 // https://github.com/espressif/esptool/wiki/Firmware-Image-Format
 // https://github.com/espressif/esp-idf/blob/8fbb63c2a701c22ccf4ce249f43aded73e134a34/components/bootloader_support/include/esp_image_format.h#L58
 // https://github.com/espressif/esptool/blob/master/esptool.py
-func makeESPFirmwareImage(infile, outfile, format string) error {
+func makeESPFirmareImage(infile, outfile, format string) error {
 	inf, err := elf.Open(infile)
 	if err != nil {
 		return err
@@ -65,6 +65,15 @@ func makeESPFirmwareImage(infile, outfile, format string) error {
 	// Sort the segments by address. This is what esptool does too.
 	sort.SliceStable(segments, func(i, j int) bool { return segments[i].addr < segments[j].addr })
 
+	// Calculate checksum over the segment data. This is used in the image
+	// footer.
+	checksum := uint8(0xef)
+	for _, segment := range segments {
+		for _, b := range segment.data {
+			checksum ^= b
+		}
+	}
+
 	// Write first to an in-memory buffer, primarily so that we can easily
 	// calculate a hash over the entire image.
 	// An added benefit is that we don't need to check for errors all the time.
@@ -79,86 +88,6 @@ func makeESPFirmwareImage(infile, outfile, format string) error {
 		chip = format[:len(format)-len("-img")]
 	}
 
-	// For ESP32 (original): separate RAM segments (loadable by ROM bootloader)
-	// from flash-mapped segments (DROM/IROM, require MMU setup by startup code).
-	// The ROM bootloader on ESP32 does NOT handle flash-mapped segments —
-	// it tries to memcpy to the virtual address, which crashes.
-	var flashSegments []*espImageSegment
-	if chip == "esp32" {
-		var ramSegments []*espImageSegment
-		for _, seg := range segments {
-			if (seg.addr >= 0x3F400000 && seg.addr < 0x3F800000) || // DROM
-				(seg.addr >= 0x400D0000 && seg.addr < 0x40400000) { // IROM
-				flashSegments = append(flashSegments, seg)
-			} else {
-				ramSegments = append(ramSegments, seg)
-			}
-		}
-		segments = ramSegments
-	}
-
-	// ESP32 flash XIP: compute where the DROM segment will be placed in flash
-	// (page-aligned, right after the RAM segments) and patch the
-	// _drom_flash_addr variable so the startup code can program the cache MMU.
-	// This must happen before the checksum/hash are computed so the patched
-	// value is covered by both.
-	const esp32FlashBase = 0x1000 // esptool flashes the image at 0x1000
-	// The ESP32 flash cache MMU supports configurable page sizes down to 256 B. 64 KiB is the reset/default size.
-	// If the startup code ever changes the MMU page size, this constant must change too.
-	const esp32PageSize = 0x10000 // 64KB MMU pages
-	var esp32DromFlashAddr uint32
-	if chip == "esp32" && len(flashSegments) > 0 {
-		// Compute the size of the RAM portion of the image (everything the ROM
-		// bootloader loads, up to and including the appended SHA256 hash).
-		ramImageSize := 0
-		if makeImage {
-			ramImageSize += 4096
-		}
-		ramImageSize += 24 // image header (8) + trailer fields (16)
-		for _, seg := range segments {
-			ramImageSize += 8 + len(seg.data) // segment header + data (4-aligned)
-		}
-		ramImageSize += 16 - ramImageSize%16 // footer padding + checksum byte
-		ramImageSize += 32                   // appended SHA256 hash
-
-		// DROM flash address must be 64KB page-aligned.
-		esp32DromFlashAddr = uint32(esp32FlashBase+ramImageSize+esp32PageSize-1) &^ (esp32PageSize - 1)
-
-		// Patch _drom_flash_addr in whichever RAM segment contains it.
-		syms, _ := inf.Symbols()
-		var dromSymAddr uint64
-		for _, s := range syms {
-			if s.Name == "_drom_flash_addr" {
-				dromSymAddr = s.Value
-				break
-			}
-		}
-		if dromSymAddr == 0 {
-			return fmt.Errorf("ESP32: _drom_flash_addr symbol not found")
-		}
-		patched := false
-		for _, seg := range segments {
-			if dromSymAddr >= uint64(seg.addr) && dromSymAddr+4 <= uint64(seg.addr)+uint64(len(seg.data)) {
-				off := int(dromSymAddr - uint64(seg.addr))
-				binary.LittleEndian.PutUint32(seg.data[off:], esp32DromFlashAddr)
-				patched = true
-				break
-			}
-		}
-		if !patched {
-			return fmt.Errorf("ESP32: _drom_flash_addr (0x%x) not in any RAM segment", dromSymAddr)
-		}
-	}
-
-	// Calculate checksum over the segment data. This is used in the image
-	// footer.
-	checksum := uint8(0xef)
-	for _, segment := range segments {
-		for _, b := range segment.data {
-			checksum ^= b
-		}
-	}
-
 	if makeImage {
 		// The bootloader starts at 0x1000, or 4096.
 		// TinyGo doesn't use a separate bootloader and runs the entire
@@ -171,24 +100,11 @@ func makeESPFirmwareImage(infile, outfile, format string) error {
 	chip_id := map[string]uint16{
 		"esp32":   0x0000,
 		"esp32c3": 0x0005,
-		"esp32c6": 0x000d,
-		"esp32s3": 0x0009,
-	}[chip]
-
-	// SPI flash speed/size byte (byte 3 of header):
-	//   Upper nibble = flash size, lower nibble = flash frequency.
-	//   The espflasher auto-detects and patches the flash size (upper nibble),
-	//   but the frequency (lower nibble) must be correct per chip.
-	spiSpeedSize := map[string]uint8{
-		"esp32":   0x1f, // 80MHz=0x0F, 2MB=0x10
-		"esp32c3": 0x1f, // 80MHz=0x0F, 2MB=0x10
-		"esp32c6": 0x10, // 80MHz=0x00, 2MB=0x10 (C6 uses different freq encoding)
-		"esp32s3": 0x1f, // 80MHz=0x0F, 2MB=0x10
 	}[chip]
 
 	// Image header.
 	switch chip {
-	case "esp32", "esp32c3", "esp32s3", "esp32c6":
+	case "esp32", "esp32c3":
 		// Header format:
 		// https://github.com/espressif/esp-idf/blob/v4.3/components/bootloader_support/include/esp_app_format.h#L71
 		// Note: not adding a SHA256 hash as the binary is modified by
@@ -209,8 +125,8 @@ func makeESPFirmwareImage(infile, outfile, format string) error {
 		}{
 			magic:          0xE9,
 			segment_count:  byte(len(segments)),
-			spi_mode:       2, // ESP_IMAGE_SPI_MODE_DIO
-			spi_speed_size: spiSpeedSize,
+			spi_mode:       2,    // ESP_IMAGE_SPI_MODE_DIO
+			spi_speed_size: 0x1f, // ESP_IMAGE_SPI_SPEED_80M, ESP_IMAGE_FLASH_SIZE_2MB
 			entry_addr:     uint32(inf.Entry),
 			wp_pin:         0xEE, // disable WP pin
 			chip_id:        chip_id,
@@ -262,58 +178,6 @@ func makeESPFirmwareImage(infile, outfile, format string) error {
 		outf.Write(hash[:])
 	}
 
-	// For ESP32: append flash-mapped segments (DROM/IROM) at page-aligned flash
-	// offsets after the RAM portion. The startup code maps them via the flash
-	// cache MMU (DROM at esp32DromFlashAddr, patched into _drom_flash_addr).
-	if len(flashSegments) > 0 {
-		const flashBase = esp32FlashBase
-		const pageSize = esp32PageSize
-		dromFlashAddr := esp32DromFlashAddr
-
-		// Separate DROM and IROM segments.
-		var dromSegs, iromSegs []*espImageSegment
-		for _, seg := range flashSegments {
-			if seg.addr >= 0x3F400000 && seg.addr < 0x3F800000 {
-				dromSegs = append(dromSegs, seg)
-			} else {
-				iromSegs = append(iromSegs, seg)
-			}
-		}
-
-		// Write DROM segments at the computed page-aligned flash offset.
-		dromSize := 0
-		if len(dromSegs) > 0 {
-			targetImageOffset := int(dromFlashAddr - flashBase)
-			if outf.Len() > targetImageOffset {
-				return fmt.Errorf("ESP32: RAM segments too large (%d bytes), overlap DROM at flash 0x%x", outf.Len(), dromFlashAddr)
-			}
-			outf.Write(make([]byte, targetImageOffset-outf.Len()))
-			for _, seg := range dromSegs {
-				outf.Write(seg.data)
-				dromSize += len(seg.data)
-			}
-		}
-
-		// Write IROM segments immediately after DROM, at the next page boundary.
-		// IROM flash addr = dromFlashAddr + ceil(dromSize/pageSize)*pageSize
-		// (must match the computation in the startup assembly).
-		if len(iromSegs) > 0 {
-			dromPages := (dromSize + pageSize - 1) / pageSize
-			if dromPages == 0 {
-				dromPages = 1
-			}
-			iromFlashAddr := dromFlashAddr + uint32(dromPages)*pageSize
-			targetImageOffset := int(iromFlashAddr - flashBase)
-			if outf.Len() > targetImageOffset {
-				return fmt.Errorf("ESP32: DROM too large, overlaps IROM at flash 0x%x", iromFlashAddr)
-			}
-			outf.Write(make([]byte, targetImageOffset-outf.Len()))
-			for _, seg := range iromSegs {
-				outf.Write(seg.data)
-			}
-		}
-	}
-
 	// QEMU (or more precisely, qemu-system-xtensa from Espressif) expects the
 	// image to be a certain size.
 	if makeImage {

builder/jobs.go

@@ -17,6 +17,14 @@ import (
 // concurrency or performance issues.
 const jobRunnerDebug = false
 
+type jobState uint8
+
+const (
+	jobStateQueued   jobState = iota // not yet running
+	jobStateRunning                  // running
+	jobStateFinished                 // finished running
+)
+
 // compileJob is a single compiler job, comparable to a single Makefile target.
 // It is used to orchestrate various compiler tasks that can be run in parallel
 // but that have dependencies and thus have limitations in how they can be run.
@@ -47,11 +55,12 @@ func dummyCompileJob(result string) *compileJob {
 // ordered as such in the job dependencies.
 func runJobs(job *compileJob, sema chan struct{}) error {
 	if sema == nil {
-		// Have a default, if the semaphore isn't set. This is useful for tests.
+		// Have a default, if the semaphore isn't set. This is useful for
+		// tests.
 		sema = make(chan struct{}, runtime.NumCPU())
 	}
 	if cap(sema) == 0 {
-		return errors.New("cannot run 0 jobs at a time")
+		return errors.New("cannot 0 jobs at a time")
 	}
 
 	// Create a slice of jobs to run, where all dependencies are run in order.
@@ -72,10 +81,10 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 
 	waiting := make(map[*compileJob]map[*compileJob]struct{}, len(jobs))
 	dependents := make(map[*compileJob][]*compileJob, len(jobs))
-	compileJobs := make(map[*compileJob]int)
+	jidx := make(map[*compileJob]int)
 	var ready intHeap
 	for i, job := range jobs {
-		compileJobs[job] = i
+		jidx[job] = i
 		if len(job.dependencies) == 0 {
 			// This job is ready to run.
 			ready.Push(i)
@@ -96,7 +105,8 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 	// Create a channel to accept notifications of completion.
 	doneChan := make(chan *compileJob)
 
-	// Send each job in the jobs slice to a worker, taking care of job dependencies.
+	// Send each job in the jobs slice to a worker, taking care of job
+	// dependencies.
 	numRunningJobs := 0
 	var totalTime time.Duration
 	start := time.Now()
@@ -124,7 +134,7 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 		numRunningJobs--
 		<-sema
 		if jobRunnerDebug {
-			fmt.Println("## finished:", completed.description, "(time "+completed.duration.String()+")")
+			fmt.Println("## finished:", job.description, "(time "+job.duration.String()+")")
 		}
 		if completed.err != nil {
 			// Wait for any current jobs to finish.
@@ -146,7 +156,7 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 			delete(wait, completed)
 			if len(wait) == 0 {
 				// This job is now ready to run.
-				ready.Push(compileJobs[j])
+				ready.Push(jidx[j])
 				delete(waiting, j)
 			}
 		}
@@ -195,11 +205,11 @@ type intHeap struct {
 	sort.IntSlice
 }
 
-func (h *intHeap) Push(x any) {
+func (h *intHeap) Push(x interface{}) {
 	h.IntSlice = append(h.IntSlice, x.(int))
 }
 
-func (h *intHeap) Pop() any {
+func (h *intHeap) Pop() interface{} {
 	x := h.IntSlice[len(h.IntSlice)-1]
 	h.IntSlice = h.IntSlice[:len(h.IntSlice)-1]
 	return x

builder/library.go

@@ -15,9 +15,6 @@ import (
 
 // Library is a container for information about a single C library, such as a
 // compiler runtime or libc.
-//
-// Note: whenever a library gets changed, the version in compileopts/config.go
-// probably also needs to be incremented.
 type Library struct {
 	// The library name, such as compiler-rt or picolibc.
 	name string
@@ -28,22 +25,29 @@ type Library struct {
 	// cflags returns the C flags specific to this library
 	cflags func(target, headerPath string) []string
 
-	// cflagsForFile returns additional C flags for a particular source file.
-	cflagsForFile func(path string) []string
-
-	// needsLibc is set to true if this library needs libc headers.
-	needsLibc bool
-
 	// The source directory.
 	sourceDir func() string
 
 	// The source files, relative to sourceDir.
-	librarySources func(target string, libcNeedsMalloc bool) ([]string, error)
+	librarySources func(target string) ([]string, error)
 
 	// The source code for the crt1.o file, relative to sourceDir.
 	crt1Source string
 }
 
+// Load the library archive, possibly generating and caching it if needed.
+// The resulting directory may be stored in the provided tmpdir, which is
+// expected to be removed after the Load call.
+func (l *Library) Load(config *compileopts.Config, tmpdir string) (dir string, err error) {
+	job, unlock, err := l.load(config, tmpdir)
+	if err != nil {
+		return "", err
+	}
+	defer unlock()
+	err = runJobs(job, config.Options.Semaphore)
+	return filepath.Dir(job.result), err
+}
+
 // load returns a compile job to build this library file for the given target
 // and CPU. It may return a dummy compileJob if the library build is already
 // cached. The path is stored as job.result but is only valid after the job has
@@ -53,8 +57,13 @@ type Library struct {
 // As a side effect, this call creates the library header files if they didn't
 // exist yet.
 func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJob, abortLock func(), err error) {
-	outdir := config.LibraryPath(l.name)
+	outdir, precompiled := config.LibcPath(l.name)
 	archiveFilePath := filepath.Join(outdir, "lib.a")
+	if precompiled {
+		// Found a precompiled library for this OS/architecture. Return the path
+		// directly.
+		return dummyCompileJob(archiveFilePath), func() {}, nil
+	}
 
 	// Create a lock on the output (if supported).
 	// This is a bit messy, but avoids a deadlock because it is ordered consistently with other library loads within a build.
@@ -133,11 +142,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// Note: -fdebug-prefix-map is necessary to make the output archive
 	// reproducible. Otherwise the temporary directory is stored in the archive
 	// itself, which varies each run.
-	args := append(l.cflags(target, headerPath), "-c", "-Oz", "-gdwarf-4", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+compileopts.ClangTriple(target), "-fdebug-prefix-map="+dir+"="+remapDir)
-	resourceDir := goenv.ClangResourceDir(false)
-	if resourceDir != "" {
-		args = append(args, "-resource-dir="+resourceDir)
-	}
+	args := append(l.cflags(target, headerPath), "-c", "-Oz", "-gdwarf-4", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+target, "-fdebug-prefix-map="+dir+"="+remapDir)
 	cpu := config.CPU()
 	if cpu != "" {
 		// X86 has deprecated the -mcpu flag, so we need to use -march instead.
@@ -153,40 +158,31 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	if config.ABI() != "" {
 		args = append(args, "-mabi="+config.ABI())
 	}
-	switch compileopts.CanonicalArchName(target) {
-	case "arm":
+	if strings.HasPrefix(target, "arm") || strings.HasPrefix(target, "thumb") {
 		if strings.Split(target, "-")[2] == "linux" {
 			args = append(args, "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
 		} else {
 			args = append(args, "-fshort-enums", "-fomit-frame-pointer", "-mfloat-abi=soft", "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
 		}
-	case "avr":
+	}
+	if strings.HasPrefix(target, "avr") {
 		// AVR defaults to C float and double both being 32-bit. This deviates
 		// from what most code (and certainly compiler-rt) expects. So we need
 		// to force the compiler to use 64-bit floating point numbers for
 		// double.
 		args = append(args, "-mdouble=64")
-	case "riscv32":
-		args = append(args, "-march="+riscvMarch(config, "rv32imac"), "-fforce-enable-int128")
-	case "riscv64":
-		args = append(args, "-march="+riscvMarch(config, "rv64gc"))
-	case "mips":
-		args = append(args, "-fno-pic")
 	}
-	if config.Target.SoftFloat {
-		// Use softfloat instead of floating point instructions. This is
-		// supported on many architectures.
-		args = append(args, "-msoft-float")
-	} else {
-		if strings.HasPrefix(target, "armv5") {
-			// On ARMv5 we need to explicitly enable hardware floating point
-			// instructions: Clang appears to assume the hardware doesn't have a
-			// FPU otherwise.
-			args = append(args, "-mfpu=vfpv2")
-		}
+	if strings.HasPrefix(target, "riscv32-") {
+		args = append(args, "-march=rv32imac", "-fforce-enable-int128")
 	}
-	if l.needsLibc {
-		args = append(args, config.LibcCFlags()...)
+	if strings.HasPrefix(target, "riscv64-") {
+		args = append(args, "-march=rv64gc")
+	}
+	if strings.HasPrefix(target, "xtensa") {
+		// Hack to work around an issue in the Xtensa port:
+		// https://github.com/espressif/llvm-project/issues/52
+		// Hopefully this will be fixed soon (LLVM 14).
+		args = append(args, "-D__ELF__")
 	}
 
 	var once sync.Once
@@ -218,7 +214,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				return err
 			}
 			// Store this archive in the cache.
-			return robustRename(f.Name(), archiveFilePath)
+			return os.Rename(f.Name(), archiveFilePath)
 		},
 	}
 
@@ -226,7 +222,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 
 	// Create jobs to compile all sources. These jobs are depended upon by the
 	// archive job above, so must be run first.
-	paths, err := l.librarySources(target, config.LibcNeedsMalloc())
+	paths, err := l.librarySources(target)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -240,14 +236,11 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 		objpath := filepath.Join(dir, cleanpath+".o")
 		os.MkdirAll(filepath.Dir(objpath), 0o777)
 		objs = append(objs, objpath)
-		objfile := &compileJob{
+		job.dependencies = append(job.dependencies, &compileJob{
 			description: "compile " + srcpath,
 			run: func(*compileJob) error {
 				var compileArgs []string
 				compileArgs = append(compileArgs, args...)
-				if l.cflagsForFile != nil {
-					compileArgs = append(compileArgs, l.cflagsForFile(path)...)
-				}
 				compileArgs = append(compileArgs, "-o", objpath, srcpath)
 				if config.Options.PrintCommands != nil {
 					config.Options.PrintCommands("clang", compileArgs...)
@@ -258,8 +251,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				}
 				return nil
 			},
-		}
-		job.dependencies = append(job.dependencies, objfile)
+		})
 	}
 
 	// Create crt1.o job, if needed.
@@ -268,7 +260,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// won't make much of a difference in speed).
 	if l.crt1Source != "" {
 		srcpath := filepath.Join(sourceDir, l.crt1Source)
-		crt1Job := &compileJob{
+		job.dependencies = append(job.dependencies, &compileJob{
 			description: "compile " + srcpath,
 			run: func(*compileJob) error {
 				var compileArgs []string
@@ -288,8 +280,7 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 				}
 				return os.Rename(tmpfile.Name(), filepath.Join(outdir, "crt1.o"))
 			},
-		}
-		job.dependencies = append(job.dependencies, crt1Job)
+		})
 	}
 
 	ok = true
@@ -297,17 +288,3 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 		once.Do(unlock)
 	}, nil
 }
-
-// riscvMarch returns the -march value for RISC-V library compilation.
-// It extracts the value from the target's cflags if present, otherwise
-// falls back to the provided default. This ensures libraries are compiled
-// with the correct ISA extensions for each target (e.g. rv32imc for
-// ESP32-C3 which lacks the atomic extension).
-func riscvMarch(config *compileopts.Config, defaultMarch string) string {
-	for _, flag := range config.Target.CFlags {
-		if strings.HasPrefix(flag, "-march=") {
-			return flag[len("-march="):]
-		}
-	}
-	return defaultMarch
-}

builder/lld.cpp

@@ -3,30 +3,27 @@
 // This file provides C wrappers for liblld.
 
 #include <lld/Common/Driver.h>
-#include <llvm/Support/Parallel.h>
-
-LLD_HAS_DRIVER(coff)
-LLD_HAS_DRIVER(elf)
-LLD_HAS_DRIVER(mingw)
-LLD_HAS_DRIVER(macho)
-LLD_HAS_DRIVER(wasm)
-
-static void configure() {
-#if _WIN64
-	// This is a hack to work around a hang in the LLD linker on Windows, with
-	// -DLLVM_ENABLE_THREADS=ON. It has a similar effect as the -threads=1
-	// linker flag, but with support for the COFF linker.
-	llvm::parallel::strategy = llvm::hardware_concurrency(1);
-#endif
-}
 
 extern "C" {
 
-bool tinygo_link(int argc, char **argv) {
-	configure();
+bool tinygo_link_elf(int argc, char **argv) {
 	std::vector<const char*> args(argv, argv + argc);
-	lld::Result r = lld::lldMain(args, llvm::outs(), llvm::errs(), LLD_ALL_DRIVERS);
-	return !r.retCode;
+	return lld::elf::link(args, llvm::outs(), llvm::errs(), false, false);
+}
+
+bool tinygo_link_macho(int argc, char **argv) {
+	std::vector<const char*> args(argv, argv + argc);
+	return lld::macho::link(args, llvm::outs(), llvm::errs(), false, false);
+}
+
+bool tinygo_link_mingw(int argc, char **argv) {
+	std::vector<const char*> args(argv, argv + argc);
+	return lld::mingw::link(args, llvm::outs(), llvm::errs(), false, false);
+}
+
+bool tinygo_link_wasm(int argc, char **argv) {
+	std::vector<const char*> args(argv, argv + argc);
+	return lld::wasm::link(args, llvm::outs(), llvm::errs(), false, false);
 }
 
 } // external "C"

builder/mingw-w64.go

@@ -10,7 +10,7 @@ import (
 	"github.com/tinygo-org/tinygo/goenv"
 )
 
-var libMinGW = Library{
+var MinGW = Library{
 	name: "mingw-w64",
 	makeHeaders: func(target, includeDir string) error {
 		// copy _mingw.h
@@ -27,67 +27,14 @@ var libMinGW = Library{
 		_, err = io.Copy(outf, inf)
 		return err
 	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/mingw-w64") },
+	sourceDir: func() string { return "" }, // unused
 	cflags: func(target, headerPath string) []string {
-		mingwDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/mingw-w64")
-		flags := []string{
-			"-nostdlibinc",
-			"-isystem", mingwDir + "/mingw-w64-crt/include",
-			"-isystem", mingwDir + "/mingw-w64-headers/crt",
-			"-isystem", mingwDir + "/mingw-w64-headers/include",
-			"-I", mingwDir + "/mingw-w64-headers/defaults/include",
-			"-I" + headerPath,
-		}
-		if strings.Split(target, "-")[0] == "i386" {
-			flags = append(flags,
-				"-D__MSVCRT_VERSION__=0x700", // Microsoft Visual C++ .NET 2002
-				"-D_WIN32_WINNT=0x0501",      // target Windows XP
-				"-D_CRTBLD",
-				"-Wno-pragma-pack",
-			)
-		}
-		return flags
+		// No flags necessary because there are no files to compile.
+		return nil
 	},
-	librarySources: func(target string, _ bool) ([]string, error) {
-		// These files are needed so that printf and the like are supported.
-		var sources []string
-		if strings.Split(target, "-")[0] == "i386" {
-			// Old 32-bit x86 systems use msvcrt.dll.
-			sources = []string{
-				"mingw-w64-crt/crt/pseudo-reloc.c",
-				"mingw-w64-crt/gdtoa/dmisc.c",
-				"mingw-w64-crt/gdtoa/gdtoa.c",
-				"mingw-w64-crt/gdtoa/gmisc.c",
-				"mingw-w64-crt/gdtoa/misc.c",
-				"mingw-w64-crt/math/x86/exp2.S",
-				"mingw-w64-crt/math/x86/trunc.S",
-				"mingw-w64-crt/misc/___mb_cur_max_func.c",
-				"mingw-w64-crt/misc/lc_locale_func.c",
-				"mingw-w64-crt/misc/mbrtowc.c",
-				"mingw-w64-crt/misc/strnlen.c",
-				"mingw-w64-crt/misc/wcrtomb.c",
-				"mingw-w64-crt/misc/wcsnlen.c",
-				"mingw-w64-crt/stdio/acrt_iob_func.c",
-				"mingw-w64-crt/stdio/mingw_lock.c",
-				"mingw-w64-crt/stdio/mingw_pformat.c",
-				"mingw-w64-crt/stdio/mingw_vfprintf.c",
-				"mingw-w64-crt/stdio/mingw_vsnprintf.c",
-			}
-		} else {
-			// Anything somewhat modern (amd64, arm64) uses UCRT.
-			sources = []string{
-				"mingw-w64-crt/stdio/ucrt_fprintf.c",
-				"mingw-w64-crt/stdio/ucrt_fwprintf.c",
-				"mingw-w64-crt/stdio/ucrt_printf.c",
-				"mingw-w64-crt/stdio/ucrt_snprintf.c",
-				"mingw-w64-crt/stdio/ucrt_sprintf.c",
-				"mingw-w64-crt/stdio/ucrt_vfprintf.c",
-				"mingw-w64-crt/stdio/ucrt_vprintf.c",
-				"mingw-w64-crt/stdio/ucrt_vsnprintf.c",
-				"mingw-w64-crt/stdio/ucrt_vsprintf.c",
-			}
-		}
-		return sources, nil
+	librarySources: func(target string) ([]string, error) {
+		// We only use the UCRT DLL file. No source files necessary.
+		return nil, nil
 	},
 }
 
@@ -100,41 +47,27 @@ var libMinGW = Library{
 func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
 	var jobs []*compileJob
 	root := goenv.Get("TINYGOROOT")
-	var libs []string
-	if goarch == "386" {
-		libs = []string{
-			// x86 uses msvcrt.dll instead of UCRT for compatibility with old
-			// Windows versions.
-			"advapi32.def.in",
-			"kernel32.def.in",
-			"msvcrt.def.in",
-		}
-	} else {
-		// Use the modernized UCRT on new systems.
-		// Normally all the api-ms-win-crt-*.def files are all compiled to a
-		// single .lib file. But to simplify things, we're going to leave them
-		// as separate files.
-		libs = []string{
-			"advapi32.def.in",
-			"kernel32.def.in",
-			"api-ms-win-crt-conio-l1-1-0.def",
-			"api-ms-win-crt-convert-l1-1-0.def.in",
-			"api-ms-win-crt-environment-l1-1-0.def",
-			"api-ms-win-crt-filesystem-l1-1-0.def",
-			"api-ms-win-crt-heap-l1-1-0.def",
-			"api-ms-win-crt-locale-l1-1-0.def",
-			"api-ms-win-crt-math-l1-1-0.def.in",
-			"api-ms-win-crt-multibyte-l1-1-0.def",
-			"api-ms-win-crt-private-l1-1-0.def.in",
-			"api-ms-win-crt-process-l1-1-0.def",
-			"api-ms-win-crt-runtime-l1-1-0.def.in",
-			"api-ms-win-crt-stdio-l1-1-0.def",
-			"api-ms-win-crt-string-l1-1-0.def",
-			"api-ms-win-crt-time-l1-1-0.def",
-			"api-ms-win-crt-utility-l1-1-0.def",
-		}
-	}
-	for _, name := range libs {
+	// Normally all the api-ms-win-crt-*.def files are all compiled to a single
+	// .lib file. But to simplify things, we're going to leave them as separate
+	// files.
+	for _, name := range []string{
+		"kernel32.def.in",
+		"api-ms-win-crt-conio-l1-1-0.def",
+		"api-ms-win-crt-convert-l1-1-0.def.in",
+		"api-ms-win-crt-environment-l1-1-0.def",
+		"api-ms-win-crt-filesystem-l1-1-0.def",
+		"api-ms-win-crt-heap-l1-1-0.def",
+		"api-ms-win-crt-locale-l1-1-0.def",
+		"api-ms-win-crt-math-l1-1-0.def.in",
+		"api-ms-win-crt-multibyte-l1-1-0.def",
+		"api-ms-win-crt-private-l1-1-0.def.in",
+		"api-ms-win-crt-process-l1-1-0.def",
+		"api-ms-win-crt-runtime-l1-1-0.def.in",
+		"api-ms-win-crt-stdio-l1-1-0.def",
+		"api-ms-win-crt-string-l1-1-0.def",
+		"api-ms-win-crt-time-l1-1-0.def",
+		"api-ms-win-crt-utility-l1-1-0.def",
+	} {
 		outpath := filepath.Join(tmpdir, filepath.Base(name)+".lib")
 		inpath := filepath.Join(root, "lib/mingw-w64/mingw-w64-crt/lib-common/"+name)
 		job := &compileJob{
@@ -144,9 +77,6 @@ func makeMinGWExtraLibs(tmpdir, goarch string) []*compileJob {
 				defpath := inpath
 				var archDef, emulation string
 				switch goarch {
-				case "386":
-					archDef = "-DDEF_I386"
-					emulation = "i386pe"
 				case "amd64":
 					archDef = "-DDEF_X64"
 					emulation = "i386pep"

builder/musl.go

@@ -6,52 +6,15 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
+	"tinygo.org/x/go-llvm"
 )
 
-// Create the alltypes.h file from the appropriate alltypes.h.in files.
-func buildMuslAllTypes(arch, muslDir, outputBitsDir string) error {
-	// Create the file alltypes.h.
-	f, err := os.Create(filepath.Join(outputBitsDir, "alltypes.h"))
-	if err != nil {
-		return err
-	}
-	infiles := []string{
-		filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
-		filepath.Join(muslDir, "include", "alltypes.h.in"),
-	}
-	for _, infile := range infiles {
-		data, err := os.ReadFile(infile)
-		if err != nil {
-			return err
-		}
-		lines := strings.SplitSeq(string(data), "\n")
-		for line := range lines {
-			if strings.HasPrefix(line, "TYPEDEF ") {
-				matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
-				value := matches[1]
-				name := matches[2]
-				line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
-			}
-			if strings.HasPrefix(line, "STRUCT ") {
-				matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
-				name := matches[1]
-				value := matches[2]
-				line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
-			}
-			_, err := f.WriteString(line + "\n")
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return f.Close()
-}
-
-var libMusl = Library{
+var Musl = Library{
 	name: "musl",
 	makeHeaders: func(target, includeDir string) error {
 		bits := filepath.Join(includeDir, "bits")
@@ -63,13 +26,41 @@ var libMusl = Library{
 		arch := compileopts.MuslArchitecture(target)
 		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "musl")
 
-		err = buildMuslAllTypes(arch, muslDir, bits)
+		// Create the file alltypes.h.
+		f, err := os.Create(filepath.Join(bits, "alltypes.h"))
 		if err != nil {
 			return err
 		}
+		infiles := []string{
+			filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
+			filepath.Join(muslDir, "include", "alltypes.h.in"),
+		}
+		for _, infile := range infiles {
+			data, err := os.ReadFile(infile)
+			if err != nil {
+				return err
+			}
+			lines := strings.Split(string(data), "\n")
+			for _, line := range lines {
+				if strings.HasPrefix(line, "TYPEDEF ") {
+					matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
+					value := matches[1]
+					name := matches[2]
+					line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
+				}
+				if strings.HasPrefix(line, "STRUCT ") {
+					matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
+					name := matches[1]
+					value := matches[2]
+					line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
+				}
+				f.WriteString(line + "\n")
+			}
+		}
+		f.Close()
 
 		// Create the file syscall.h.
-		f, err := os.Create(filepath.Join(bits, "syscall.h"))
+		f, err = os.Create(filepath.Join(bits, "syscall.h"))
 		if err != nil {
 			return err
 		}
@@ -102,9 +93,6 @@ var libMusl = Library{
 			"-Wno-string-plus-int",
 			"-Wno-ignored-pragmas",
 			"-Wno-tautological-constant-out-of-range-compare",
-			"-Wno-deprecated-non-prototype",
-			"-Wno-format",
-			"-Wno-parentheses",
 			"-Qunused-arguments",
 			// Select include dirs. Don't include standard library includes
 			// (that would introduce host dependencies and other complications),
@@ -118,58 +106,42 @@ var libMusl = Library{
 			"-I" + muslDir + "/include",
 			"-fno-stack-protector",
 		}
+		llvmMajor, _ := strconv.Atoi(strings.SplitN(llvm.Version, ".", 2)[0])
+		if llvmMajor >= 15 {
+			// This flag was added in Clang 15. It is not present in LLVM 14.
+			cflags = append(cflags, "-Wno-deprecated-non-prototype")
+		}
 		return cflags
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/musl/src") },
-	librarySources: func(target string, _ bool) ([]string, error) {
+	librarySources: func(target string) ([]string, error) {
 		arch := compileopts.MuslArchitecture(target)
 		globs := []string{
-			"conf/*.c",
-			"ctype/*.c",
 			"env/*.c",
 			"errno/*.c",
 			"exit/*.c",
-			"fcntl/*.c",
 			"internal/defsysinfo.c",
-			"internal/intscan.c",
 			"internal/libc.c",
-			"internal/shgetc.c",
 			"internal/syscall_ret.c",
 			"internal/vdso.c",
 			"legacy/*.c",
-			"locale/*.c",
-			"linux/*.c",
-			"locale/*.c",
 			"malloc/*.c",
 			"malloc/mallocng/*.c",
 			"mman/*.c",
 			"math/*.c",
-			"misc/*.c",
-			"multibyte/*.c",
-			"sched/*.c",
-			"signal/" + arch + "/*.s",
 			"signal/*.c",
 			"stdio/*.c",
-			"stdlib/*.c",
 			"string/*.c",
 			"thread/" + arch + "/*.s",
 			"thread/*.c",
 			"time/*.c",
 			"unistd/*.c",
-			"process/*.c",
 		}
-
 		if arch == "arm" {
 			// These files need to be added to the start for some reason.
 			globs = append([]string{"thread/arm/*.c"}, globs...)
 		}
 
-		if arch != "aarch64" && arch != "mips" {
-			//aarch64 and mips have no architecture specific code, either they
-			// are not supported or don't need any?
-			globs = append([]string{"process/" + arch + "/*.s"}, globs...)
-		}
-
 		var sources []string
 		seenSources := map[string]struct{}{}
 		basepath := goenv.Get("TINYGOROOT") + "/lib/musl/src/"

builder/nrfutil.go

@@ -1,117 +1,27 @@
 package builder
 
 import (
-	"archive/zip"
-	"bytes"
-	"encoding/binary"
-	"encoding/json"
-	"os"
+	"fmt"
+	"io"
+	"os/exec"
 
-	"github.com/sigurn/crc16"
 	"github.com/tinygo-org/tinygo/compileopts"
 )
 
-// Structure of the manifest.json file.
-type jsonManifest struct {
-	Manifest struct {
-		Application struct {
-			BinaryFile     string        `json:"bin_file"`
-			DataFile       string        `json:"dat_file"`
-			InitPacketData nrfInitPacket `json:"init_packet_data"`
-		} `json:"application"`
-		DFUVersion float64 `json:"dfu_version"` // yes, this is a JSON number, not a string
-	} `json:"manifest"`
-}
+// https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrfutil%2FUG%2Fnrfutil%2Fnrfutil_intro.html
 
-// Structure of the init packet.
-// Source:
-// https://github.com/adafruit/Adafruit_nRF52_Bootloader/blob/master/lib/sdk11/components/libraries/bootloader_dfu/dfu_init.h#L47-L57
-type nrfInitPacket struct {
-	ApplicationVersion uint32   `json:"application_version"`
-	DeviceRevision     uint16   `json:"device_revision"`
-	DeviceType         uint16   `json:"device_type"`
-	FirmwareCRC16      uint16   `json:"firmware_crc16"`
-	SoftDeviceRequired []uint16 `json:"softdevice_req"` // this is actually a variable length array
-}
-
-// Create the init packet (the contents of application.dat).
-func (p nrfInitPacket) createInitPacket() []byte {
-	buf := &bytes.Buffer{}
-	binary.Write(buf, binary.LittleEndian, p.DeviceType)                      // uint16_t device_type;
-	binary.Write(buf, binary.LittleEndian, p.DeviceRevision)                  // uint16_t device_rev;
-	binary.Write(buf, binary.LittleEndian, p.ApplicationVersion)              // uint32_t app_version;
-	binary.Write(buf, binary.LittleEndian, uint16(len(p.SoftDeviceRequired))) // uint16_t softdevice_len;
-	binary.Write(buf, binary.LittleEndian, p.SoftDeviceRequired)              // uint16_t softdevice[1];
-	binary.Write(buf, binary.LittleEndian, p.FirmwareCRC16)
-	return buf.Bytes()
-}
-
-// Make a Nordic DFU firmware image from an ELF file.
 func makeDFUFirmwareImage(options *compileopts.Options, infile, outfile string) error {
-	// Read ELF file as input and convert it to a binary image file.
-	_, data, err := extractROM(infile)
-	if err != nil {
-		return err
+	cmdLine := []string{"nrfutil", "pkg", "generate", "--hw-version", "52", "--sd-req", "0x0", "--debug-mode", "--application", infile, outfile}
+
+	if options.PrintCommands != nil {
+		options.PrintCommands(cmdLine[0], cmdLine[1:]...)
 	}
 
-	// Create the zip file in memory.
-	// It won't be very large anyway.
-	buf := &bytes.Buffer{}
-	w := zip.NewWriter(buf)
-
-	// Write the application binary to the zip file.
-	binw, err := w.Create("application.bin")
+	cmd := exec.Command(cmdLine[0], cmdLine[1:]...)
+	cmd.Stdout = io.Discard
+	err := cmd.Run()
 	if err != nil {
-		return err
+		return fmt.Errorf("could not run nrfutil pkg generate: %w", err)
 	}
-	_, err = binw.Write(data)
-	if err != nil {
-		return err
-	}
-
-	// Create the init packet.
-	initPacket := nrfInitPacket{
-		ApplicationVersion: 0xffff_ffff, // appears to be unused by the Adafruit bootloader
-		DeviceRevision:     0xffff,      // DFU_DEVICE_REVISION_EMPTY
-		DeviceType:         0x0052,      // ADAFRUIT_DEVICE_TYPE
-		FirmwareCRC16:      crc16.Checksum(data, crc16.MakeTable(crc16.CRC16_CCITT_FALSE)),
-		SoftDeviceRequired: []uint16{0xfffe}, // DFU_SOFTDEVICE_ANY
-	}
-
-	// Write the init packet to the zip file.
-	datw, err := w.Create("application.dat")
-	if err != nil {
-		return err
-	}
-	_, err = datw.Write(initPacket.createInitPacket())
-	if err != nil {
-		return err
-	}
-
-	// Create the JSON manifest.
-	manifest := &jsonManifest{}
-	manifest.Manifest.Application.BinaryFile = "application.bin"
-	manifest.Manifest.Application.DataFile = "application.dat"
-	manifest.Manifest.Application.InitPacketData = initPacket
-	manifest.Manifest.DFUVersion = 0.5
-
-	// Write the JSON manifest to the file.
-	jsonw, err := w.Create("manifest.json")
-	if err != nil {
-		return err
-	}
-	enc := json.NewEncoder(jsonw)
-	enc.SetIndent("", "    ")
-	err = enc.Encode(manifest)
-	if err != nil {
-		return err
-	}
-
-	// Finish the zip file.
-	err = w.Close()
-	if err != nil {
-		return err
-	}
-
-	return os.WriteFile(outfile, buf.Bytes(), 0o666)
+	return nil
 }

builder/picolibc.go

@@ -3,14 +3,13 @@ package builder
 import (
 	"os"
 	"path/filepath"
-	"strings"
 
 	"github.com/tinygo-org/tinygo/goenv"
 )
 
-// libPicolibc is a C library for bare metal embedded devices. It was originally
+// Picolibc is a C library for bare metal embedded devices. It was originally
 // based on newlib.
-var libPicolibc = Library{
+var Picolibc = Library{
 	name: "picolibc",
 	makeHeaders: func(target, includeDir string) error {
 		f, err := os.Create(filepath.Join(includeDir, "picolibc.h"))
@@ -29,12 +28,10 @@ var libPicolibc = Library{
 			"-D_HAVE_ALIAS_ATTRIBUTE",
 			"-DTINY_STDIO",
 			"-DPOSIX_IO",
-			"-DFORMAT_DEFAULT_INTEGER", // use __i_vfprintf and __i_vfscanf by default
 			"-D_IEEE_LIBM",
 			"-D__OBSOLETE_MATH_FLOAT=1", // use old math code that doesn't expect a FPU
 			"-D__OBSOLETE_MATH_DOUBLE=0",
 			"-D_WANT_IO_C99_FORMATS",
-			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
 			"-nostdlibinc",
 			"-isystem", newlibDir + "/libc/include",
 			"-I" + newlibDir + "/libc/tinystdio",
@@ -43,24 +40,92 @@ var libPicolibc = Library{
 		}
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib") },
-	librarySources: func(target string, _ bool) ([]string, error) {
-		sources := append([]string(nil), picolibcSources...)
-		if !strings.HasPrefix(target, "avr") {
-			// Small chips without long jumps can't compile many files (printf,
-			// pow, etc). Therefore exclude those source files for those chips.
-			// Unfortunately it's difficult to exclude only some chips, so this
-			// excludes those files on all AVR chips for now.
-			// More information:
-			// https://github.com/llvm/llvm-project/issues/67042
-			sources = append(sources, picolibcSourcesLarge...)
-		}
-		return sources, nil
+	librarySources: func(target string) ([]string, error) {
+		return picolibcSources, nil
 	},
 }
 
 var picolibcSources = []string{
 	"../../picolibc-stdio.c",
 
+	// srcs_tinystdio
+	"libc/tinystdio/asprintf.c",
+	"libc/tinystdio/bufio.c",
+	"libc/tinystdio/clearerr.c",
+	"libc/tinystdio/ecvt_r.c",
+	"libc/tinystdio/ecvt.c",
+	"libc/tinystdio/ecvtf_r.c",
+	"libc/tinystdio/ecvtf.c",
+	"libc/tinystdio/fcvt.c",
+	"libc/tinystdio/fcvt_r.c",
+	"libc/tinystdio/fcvtf.c",
+	"libc/tinystdio/fcvtf_r.c",
+	"libc/tinystdio/gcvt.c",
+	"libc/tinystdio/gcvtf.c",
+	"libc/tinystdio/fclose.c",
+	"libc/tinystdio/fdevopen.c",
+	"libc/tinystdio/feof.c",
+	"libc/tinystdio/ferror.c",
+	"libc/tinystdio/fflush.c",
+	"libc/tinystdio/fgetc.c",
+	"libc/tinystdio/fgets.c",
+	"libc/tinystdio/fileno.c",
+	"libc/tinystdio/filestrget.c",
+	"libc/tinystdio/filestrput.c",
+	"libc/tinystdio/filestrputalloc.c",
+	"libc/tinystdio/fmemopen.c",
+	"libc/tinystdio/fprintf.c",
+	"libc/tinystdio/fputc.c",
+	"libc/tinystdio/fputs.c",
+	"libc/tinystdio/fread.c",
+	//"libc/tinystdio/freopen.c", // crashes with AVR, see: https://github.com/picolibc/picolibc/pull/369
+	"libc/tinystdio/fscanf.c",
+	"libc/tinystdio/fseek.c",
+	"libc/tinystdio/fseeko.c",
+	"libc/tinystdio/ftell.c",
+	"libc/tinystdio/ftello.c",
+	"libc/tinystdio/fwrite.c",
+	"libc/tinystdio/getchar.c",
+	"libc/tinystdio/gets.c",
+	"libc/tinystdio/matchcaseprefix.c",
+	"libc/tinystdio/mktemp.c",
+	"libc/tinystdio/perror.c",
+	"libc/tinystdio/printf.c",
+	"libc/tinystdio/putchar.c",
+	"libc/tinystdio/puts.c",
+	"libc/tinystdio/rewind.c",
+	"libc/tinystdio/scanf.c",
+	"libc/tinystdio/setbuf.c",
+	"libc/tinystdio/setbuffer.c",
+	"libc/tinystdio/setlinebuf.c",
+	"libc/tinystdio/setvbuf.c",
+	"libc/tinystdio/snprintf.c",
+	"libc/tinystdio/sprintf.c",
+	"libc/tinystdio/snprintfd.c",
+	"libc/tinystdio/snprintff.c",
+	"libc/tinystdio/sprintff.c",
+	"libc/tinystdio/sprintfd.c",
+	"libc/tinystdio/sscanf.c",
+	"libc/tinystdio/strfromf.c",
+	"libc/tinystdio/strfromd.c",
+	"libc/tinystdio/strtof.c",
+	"libc/tinystdio/strtof_l.c",
+	"libc/tinystdio/strtod.c",
+	"libc/tinystdio/strtod_l.c",
+	"libc/tinystdio/ungetc.c",
+	"libc/tinystdio/vasprintf.c",
+	"libc/tinystdio/vfiprintf.c",
+	"libc/tinystdio/vfprintf.c",
+	"libc/tinystdio/vfprintff.c",
+	"libc/tinystdio/vfscanf.c",
+	"libc/tinystdio/vfiscanf.c",
+	"libc/tinystdio/vfscanff.c",
+	"libc/tinystdio/vprintf.c",
+	"libc/tinystdio/vscanf.c",
+	"libc/tinystdio/vsscanf.c",
+	"libc/tinystdio/vsnprintf.c",
+	"libc/tinystdio/vsprintf.c",
+
 	"libc/string/bcmp.c",
 	"libc/string/bcopy.c",
 	"libc/string/bzero.c",
@@ -164,87 +229,6 @@ var picolibcSources = []string{
 	"libc/string/wmempcpy.c",
 	"libc/string/wmemset.c",
 	"libc/string/xpg_strerror_r.c",
-}
-
-// Parts of picolibc that are too large for small AVRs.
-var picolibcSourcesLarge = []string{
-	// srcs_tinystdio
-	"libc/tinystdio/asprintf.c",
-	"libc/tinystdio/bufio.c",
-	"libc/tinystdio/clearerr.c",
-	"libc/tinystdio/ecvt_r.c",
-	"libc/tinystdio/ecvt.c",
-	"libc/tinystdio/ecvtf_r.c",
-	"libc/tinystdio/ecvtf.c",
-	"libc/tinystdio/fcvt.c",
-	"libc/tinystdio/fcvt_r.c",
-	"libc/tinystdio/fcvtf.c",
-	"libc/tinystdio/fcvtf_r.c",
-	"libc/tinystdio/gcvt.c",
-	"libc/tinystdio/gcvtf.c",
-	"libc/tinystdio/fclose.c",
-	"libc/tinystdio/fdevopen.c",
-	"libc/tinystdio/feof.c",
-	"libc/tinystdio/ferror.c",
-	"libc/tinystdio/fflush.c",
-	"libc/tinystdio/fgetc.c",
-	"libc/tinystdio/fgets.c",
-	"libc/tinystdio/fileno.c",
-	"libc/tinystdio/filestrget.c",
-	"libc/tinystdio/filestrput.c",
-	"libc/tinystdio/filestrputalloc.c",
-	"libc/tinystdio/fmemopen.c",
-	"libc/tinystdio/fprintf.c",
-	"libc/tinystdio/fputc.c",
-	"libc/tinystdio/fputs.c",
-	"libc/tinystdio/fread.c",
-	//"libc/tinystdio/freopen.c", // crashes with AVR, see: https://github.com/picolibc/picolibc/pull/369
-	"libc/tinystdio/fscanf.c",
-	"libc/tinystdio/fseek.c",
-	"libc/tinystdio/fseeko.c",
-	"libc/tinystdio/ftell.c",
-	"libc/tinystdio/ftello.c",
-	"libc/tinystdio/fwrite.c",
-	"libc/tinystdio/getchar.c",
-	"libc/tinystdio/gets.c",
-	"libc/tinystdio/matchcaseprefix.c",
-	"libc/tinystdio/mktemp.c",
-	"libc/tinystdio/perror.c",
-	"libc/tinystdio/printf.c",
-	"libc/tinystdio/putchar.c",
-	"libc/tinystdio/puts.c",
-	"libc/tinystdio/rewind.c",
-	"libc/tinystdio/scanf.c",
-	"libc/tinystdio/setbuf.c",
-	"libc/tinystdio/setbuffer.c",
-	"libc/tinystdio/setlinebuf.c",
-	"libc/tinystdio/setvbuf.c",
-	"libc/tinystdio/snprintf.c",
-	"libc/tinystdio/sprintf.c",
-	"libc/tinystdio/snprintfd.c",
-	"libc/tinystdio/snprintff.c",
-	"libc/tinystdio/sprintff.c",
-	"libc/tinystdio/sprintfd.c",
-	"libc/tinystdio/sscanf.c",
-	"libc/tinystdio/strfromf.c",
-	"libc/tinystdio/strfromd.c",
-	"libc/tinystdio/strtof.c",
-	"libc/tinystdio/strtof_l.c",
-	"libc/tinystdio/strtod.c",
-	"libc/tinystdio/strtod_l.c",
-	"libc/tinystdio/ungetc.c",
-	"libc/tinystdio/vasprintf.c",
-	"libc/tinystdio/vfiprintf.c",
-	"libc/tinystdio/vfprintf.c",
-	"libc/tinystdio/vfprintff.c",
-	"libc/tinystdio/vfscanf.c",
-	"libc/tinystdio/vfiscanf.c",
-	"libc/tinystdio/vfscanff.c",
-	"libc/tinystdio/vprintf.c",
-	"libc/tinystdio/vscanf.c",
-	"libc/tinystdio/vsscanf.c",
-	"libc/tinystdio/vsnprintf.c",
-	"libc/tinystdio/vsprintf.c",
 
 	"libm/common/sf_finite.c",
 	"libm/common/sf_copysign.c",
@@ -339,12 +323,6 @@ var picolibcSourcesLarge = []string{
 	"libm/common/math_err_may_uflow.c",
 	"libm/common/math_err_check_uflow.c",
 	"libm/common/math_err_check_oflow.c",
-	"libm/common/math_errf_divzerof.c",
-	"libm/common/math_errf_invalidf.c",
-	"libm/common/math_errf_may_uflowf.c",
-	"libm/common/math_errf_oflowf.c",
-	"libm/common/math_errf_uflowf.c",
-	"libm/common/math_errf_with_errnof.c",
 	"libm/common/math_inexact.c",
 	"libm/common/math_inexactf.c",
 	"libm/common/log.c",

builder/robustio_other.go

@@ -1,9 +0,0 @@
-//go:build !windows
-
-package builder
-
-import "os"
-
-func robustRename(oldpath, newpath string) error {
-	return os.Rename(oldpath, newpath)
-}

builder/robustio_windows.go

@@ -1,44 +0,0 @@
-package builder
-
-import (
-	"errors"
-	"math/rand"
-	"os"
-	"syscall"
-	"time"
-)
-
-const robustRenameTimeout = 2 * time.Second
-
-func robustRename(oldpath, newpath string) error {
-	var bestErr error
-	start := time.Now()
-	nextSleep := time.Millisecond
-	for {
-		err := os.Rename(oldpath, newpath)
-		if err == nil || !isEphemeralRenameError(err) {
-			return err
-		}
-		if bestErr == nil {
-			bestErr = err
-		}
-		if d := time.Since(start) + nextSleep; d >= robustRenameTimeout {
-			return bestErr
-		}
-		time.Sleep(nextSleep)
-		nextSleep += time.Duration(rand.Int63n(int64(nextSleep)))
-	}
-}
-
-func isEphemeralRenameError(err error) bool {
-	var errno syscall.Errno
-	if errors.As(err, &errno) {
-		switch errno {
-		case syscall.Errno(2), // ERROR_FILE_NOT_FOUND
-			syscall.Errno(5),  // ERROR_ACCESS_DENIED
-			syscall.Errno(32): // ERROR_SHARING_VIOLATION
-			return true
-		}
-	}
-	return false
-}

builder/size-report.go

@@ -1,56 +0,0 @@
-package builder
-
-import (
-	_ "embed"
-	"fmt"
-	"html/template"
-	"os"
-)
-
-//go:embed size-report.html
-var sizeReportBase string
-
-func writeSizeReport(sizes *programSize, filename, pkgName string) error {
-	tmpl, err := template.New("report").Parse(sizeReportBase)
-	if err != nil {
-		return err
-	}
-
-	f, err := os.Create(filename)
-	if err != nil {
-		return fmt.Errorf("could not open report file: %w", err)
-	}
-	defer f.Close()
-
-	// Prepare data for the report.
-	type sizeLine struct {
-		Name string
-		Size *packageSize
-	}
-	programData := []sizeLine{}
-	for _, name := range sizes.sortedPackageNames() {
-		pkgSize := sizes.Packages[name]
-		programData = append(programData, sizeLine{
-			Name: name,
-			Size: pkgSize,
-		})
-	}
-	sizeTotal := map[string]uint64{
-		"code":   sizes.Code,
-		"rodata": sizes.ROData,
-		"data":   sizes.Data,
-		"bss":    sizes.BSS,
-		"flash":  sizes.Flash(),
-	}
-
-	// Write the report.
-	err = tmpl.Execute(f, map[string]any{
-		"pkgName":   pkgName,
-		"sizes":     programData,
-		"sizeTotal": sizeTotal,
-	})
-	if err != nil {
-		return fmt.Errorf("could not create report file: %w", err)
-	}
-	return nil
-}

builder/size-report.html

@@ -1,109 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <title>Size Report for {{.pkgName}}</title>
-    <meta charset="utf-8"/>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
-    <style>
-
-.table-vertical-border {
-  border-left: calc(var(--bs-border-width) * 2) solid currentcolor;
-}
-
-/* Hover on only the rows that are clickable. */
-.row-package:hover > * {
-  --bs-table-color-state: var(--bs-table-hover-color);
-  --bs-table-bg-state: var(--bs-table-hover-bg);
-}
-
-    </style>
-  </head>
-  <body>
-    <div class="container-xxl">
-      <h1>Size Report for {{.pkgName}}</h1>
-
-      <p>How much space is used by Go packages, C libraries, and other bits to set up the program environment.</p>
-
-      <ul>
-        <li><strong>Code</strong> is the actual program code (machine code instructions).</li>
-        <li><strong>Read-only data</strong> are read-only global variables. On most microcontrollers, these are stored in flash and do not take up any RAM.</li>
-        <li><strong>Data</strong> are writable global variables with a non-zero initializer. On microcontrollers, they are copied from flash to RAM on reset.</li>
-        <li><strong>BSS</strong> are writable global variables that are zero initialized. They do not take up any space in the binary, but do take up RAM. On microcontrollers, this area is zeroed on reset.</li>
-      </ul>
-
-      <p>The binary size consists of code, read-only data, and data. On microcontrollers, this is exactly the size of the firmware image. On other systems, there is some extra overhead: binary metadata (headers of the ELF/MachO/COFF file), debug information, exception tables, symbol names, etc. Using <code>-no-debug</code> strips most of those.</p>
-
-      <h2>Program breakdown</h2>
-
-      <p>You can click on the rows below to see which files contribute to the binary size.</p>
-
-      <div class="table-responsive">
-        <table class="table w-auto">
-          <thead>
-            <tr>
-              <th>Package</th>
-              <th class="table-vertical-border">Code</th>
-              <th>Read-only data</th>
-              <th>Data</th>
-              <th title="zero-initialized data">BSS</th>
-              <th class="table-vertical-border" style="min-width: 16em">Binary size</th>
-            </tr>
-          </thead>
-          <tbody class="table-group-divider">
-            {{range $i, $pkg := .sizes}}
-            <tr class="row-package" data-collapse=".collapse-row-{{$i}}">
-              <td>{{.Name}}</td>
-              <td class="table-vertical-border">{{.Size.Code}}</td>
-              <td>{{.Size.ROData}}</td>
-              <td>{{.Size.Data}}</td>
-              <td>{{.Size.BSS}}</td>
-              <td class="table-vertical-border" style="background: linear-gradient(to right, var(--bs-info-bg-subtle) {{.Size.FlashPercent}}%, var(--bs-table-bg) {{.Size.FlashPercent}}%)">
-                {{.Size.Flash}}
-              </td>
-            </tr>
-            {{range $filename, $sizes := .Size.Sub}}
-            <tr class="table-secondary collapse collapse-row-{{$i}}">
-              <td class="ps-4">
-                {{if eq $filename ""}}
-                  (unknown file)
-                {{else}}
-                  {{$filename}}
-                {{end}}
-              </td>
-              <td class="table-vertical-border">{{$sizes.Code}}</td>
-              <td>{{$sizes.ROData}}</td>
-              <td>{{$sizes.Data}}</td>
-              <td>{{$sizes.BSS}}</td>
-              <td class="table-vertical-border" style="background: linear-gradient(to right, var(--bs-info-bg-subtle) {{$sizes.FlashPercent}}%, var(--bs-table-bg) {{$sizes.FlashPercent}}%)">
-                {{$sizes.Flash}}
-              </td>
-            </tr>
-            {{end}}
-            {{end}}
-          </tbody>
-          <tfoot class="table-group-divider">
-            <tr>
-              <th>Total</th>
-              <td class="table-vertical-border">{{.sizeTotal.code}}</td>
-              <td>{{.sizeTotal.rodata}}</td>
-              <td>{{.sizeTotal.data}}</td>
-              <td>{{.sizeTotal.bss}}</td>
-              <td class="table-vertical-border">{{.sizeTotal.flash}}</td>
-            </tr>
-          </tfoot>
-        </table>
-      </div>
-    </div>
-    <script>
-// Make table rows toggleable to show filenames.
-for (let clickable of document.querySelectorAll('.row-package')) {
-  clickable.addEventListener('click', e => {
-    for (let row of document.querySelectorAll(clickable.dataset.collapse)) {
-      row.classList.toggle('show');
-    }
-  });
-}
-    </script>
-  </body>
-</html>

builder/sizes.go

@@ -12,7 +12,6 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"runtime"
 	"sort"
 	"strings"
 
@@ -25,7 +24,7 @@ const sizesDebug = false
 
 // programSize contains size statistics per package of a compiled program.
 type programSize struct {
-	Packages map[string]*packageSize
+	Packages map[string]packageSize
 	Code     uint64
 	ROData   uint64
 	Data     uint64
@@ -53,29 +52,13 @@ func (ps *programSize) RAM() uint64 {
 	return ps.Data + ps.BSS
 }
 
-// Return the package size information for a given package path, creating it if
-// it doesn't exist yet.
-func (ps *programSize) getPackage(path string) *packageSize {
-	if field, ok := ps.Packages[path]; ok {
-		return field
-	}
-	field := &packageSize{
-		Program: ps,
-		Sub:     map[string]*packageSize{},
-	}
-	ps.Packages[path] = field
-	return field
-}
-
 // packageSize contains the size of a package, calculated from the linked object
 // file.
 type packageSize struct {
-	Program *programSize
-	Code    uint64
-	ROData  uint64
-	Data    uint64
-	BSS     uint64
-	Sub     map[string]*packageSize
+	Code   uint64
+	ROData uint64
+	Data   uint64
+	BSS    uint64
 }
 
 // Flash usage in regular microcontrollers.
@@ -88,36 +71,10 @@ func (ps *packageSize) RAM() uint64 {
 	return ps.Data + ps.BSS
 }
 
-// Flash usage in regular microcontrollers, as a percentage of the total flash
-// usage of the program.
-func (ps *packageSize) FlashPercent() float64 {
-	return float64(ps.Flash()) / float64(ps.Program.Flash()) * 100
-}
-
-// Add a single size data point to this package.
-// This must only be called while calculating package size, not afterwards.
-func (ps *packageSize) addSize(getField func(*packageSize, bool) *uint64, filename string, size uint64, isVariable bool) {
-	if size == 0 {
-		return
-	}
-
-	// Add size for the package.
-	*getField(ps, isVariable) += size
-
-	// Add size for file inside package.
-	sub, ok := ps.Sub[filename]
-	if !ok {
-		sub = &packageSize{Program: ps.Program}
-		ps.Sub[filename] = sub
-	}
-	*getField(sub, isVariable) += size
-}
-
 // A mapping of a single chunk of code or data to a file path.
 type addressLine struct {
 	Address    uint64
 	Length     uint64 // length of this chunk
-	Align      uint64 // (maximum) alignment of this line
 	File       string // file path as stored in DWARF
 	IsVariable bool   // true if this is a variable (or constant), false if it is code
 }
@@ -129,7 +86,6 @@ type memorySection struct {
 	Type    memoryType
 	Address uint64
 	Size    uint64
-	Align   uint64
 }
 
 type memoryType int
@@ -161,13 +117,17 @@ var (
 	//   alloc:  heap allocations during init interpretation
 	//   pack:   data created when storing a constant in an interface for example
 	//   string: buffer behind strings
-	packageSymbolRegexp = regexp.MustCompile(`\$(alloc|pack|string)(\.[0-9]+)?$`)
+	packageSymbolRegexp = regexp.MustCompile(`\$(alloc|embedfsfiles|embedfsslice|embedslice|pack|string)(\.[0-9]+)?$`)
+
+	// Reflect sidetables. Created by the reflect lowering pass.
+	// See src/reflect/sidetables.go.
+	reflectDataRegexp = regexp.MustCompile(`^reflect\.[a-zA-Z]+Sidetable$`)
 )
 
 // readProgramSizeFromDWARF reads the source location for each line of code and
 // each variable in the program, as far as this is stored in the DWARF debug
 // information.
-func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64, skipTombstone bool) ([]addressLine, error) {
+func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset uint64, skipTombstone bool) ([]addressLine, error) {
 	r := data.Reader()
 	var lines []*dwarf.LineFile
 	var addresses []addressLine
@@ -236,22 +196,10 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 				if !prevLineEntry.EndSequence {
 					// The chunk describes the code from prevLineEntry to
 					// lineEntry.
-					path := prevLineEntry.File.Name
-					if runtime.GOOS == "windows" {
-						// Work around a Clang bug on Windows:
-						// https://github.com/llvm/llvm-project/issues/117317
-						path = strings.ReplaceAll(path, "\\\\", "\\")
-
-						// wasi-libc likes to use forward slashes, but we
-						// canonicalize everything to use backwards slashes as
-						// is common on Windows.
-						path = strings.ReplaceAll(path, "/", "\\")
-					}
 					line := addressLine{
 						Address: prevLineEntry.Address + codeOffset,
 						Length:  lineEntry.Address - prevLineEntry.Address,
-						Align:   codeAlignment,
-						File:    path,
+						File:    prevLineEntry.File.Name,
 					}
 					if line.Length != 0 {
 						addresses = append(addresses, line)
@@ -275,9 +223,20 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 			// Try to parse the location. While this could in theory be a very
 			// complex expression, usually it's just a DW_OP_addr opcode
 			// followed by an address.
-			addr, err := readDWARFConstant(r.AddressSize(), location.Val.([]uint8))
-			if err != nil {
-				continue // ignore the error, we don't know what to do with it
+			locationCode := location.Val.([]uint8)
+			if locationCode[0] != 3 { // DW_OP_addr
+				continue
+			}
+			var addr uint64
+			switch len(locationCode) {
+			case 1 + 2:
+				addr = uint64(binary.LittleEndian.Uint16(locationCode[1:]))
+			case 1 + 4:
+				addr = uint64(binary.LittleEndian.Uint32(locationCode[1:]))
+			case 1 + 8:
+				addr = binary.LittleEndian.Uint64(locationCode[1:])
+			default:
+				continue // unknown address
 			}
 
 			// Parse the type of the global variable, which (importantly)
@@ -288,16 +247,9 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 				return nil, err
 			}
 
-			// Read alignment, if it's stored as part of the debug information.
-			var alignment uint64
-			if attr := e.AttrField(dwarf.AttrAlignment); attr != nil {
-				alignment = uint64(attr.Val.(int64))
-			}
-
 			addresses = append(addresses, addressLine{
 				Address:    addr,
 				Length:     uint64(typ.Size()),
-				Align:      alignment,
 				File:       lines[file.Val.(int64)].Name,
 				IsVariable: true,
 			})
@@ -308,52 +260,6 @@ func readProgramSizeFromDWARF(data *dwarf.Data, codeOffset, codeAlignment uint64
 	return addresses, nil
 }
 
-// Parse a DWARF constant. For addresses, this is usually a very simple
-// expression.
-func readDWARFConstant(addressSize int, bytecode []byte) (uint64, error) {
-	var addr uint64
-	for len(bytecode) != 0 {
-		op := bytecode[0]
-		bytecode = bytecode[1:]
-		switch op {
-		case 0x03: // DW_OP_addr
-			switch addressSize {
-			case 2:
-				addr = uint64(binary.LittleEndian.Uint16(bytecode))
-			case 4:
-				addr = uint64(binary.LittleEndian.Uint32(bytecode))
-			case 8:
-				addr = binary.LittleEndian.Uint64(bytecode)
-			default:
-				panic("unexpected address size")
-			}
-			bytecode = bytecode[addressSize:]
-		case 0x23: // DW_OP_plus_uconst
-			offset, n := readULEB128(bytecode)
-			addr += offset
-			bytecode = bytecode[n:]
-		default:
-			return 0, fmt.Errorf("unknown DWARF opcode: 0x%x", op)
-		}
-	}
-	return addr, nil
-}
-
-// Source: https://en.wikipedia.org/wiki/LEB128#Decode_unsigned_integer
-func readULEB128(buf []byte) (result uint64, n int) {
-	var shift uint8
-	for {
-		b := buf[n]
-		n++
-		result |= uint64(b&0x7f) << shift
-		if b&0x80 == 0 {
-			break
-		}
-		shift += 7
-	}
-	return
-}
-
 // Read a MachO object file and return a line table.
 // Also return an index from symbol name to start address in the line table.
 func readMachOSymbolAddresses(path string) (map[string]int, []addressLine, error) {
@@ -375,7 +281,7 @@ func readMachOSymbolAddresses(path string) (map[string]int, []addressLine, error
 	if err != nil {
 		return nil, nil, err
 	}
-	lines, err := readProgramSizeFromDWARF(dwarf, 0, 0, false)
+	lines, err := readProgramSizeFromDWARF(dwarf, 0, false)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -432,15 +338,10 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 	// Load the binary file, which could be in a number of file formats.
 	var sections []memorySection
 	if file, err := elf.NewFile(f); err == nil {
-		var codeAlignment uint64
-		switch file.Machine {
-		case elf.EM_ARM:
-			codeAlignment = 4 // usually 2, but can be 4
-		}
 		// Read DWARF information. The error is intentionally ignored.
 		data, _ := file.DWARF()
 		if data != nil {
-			addresses, err = readProgramSizeFromDWARF(data, 0, codeAlignment, true)
+			addresses, err = readProgramSizeFromDWARF(data, 0, true)
 			if err != nil {
 				// However, _do_ report an error here. Something must have gone
 				// wrong while trying to parse DWARF data.
@@ -474,7 +375,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 			if section.Flags&elf.SHF_ALLOC == 0 {
 				continue
 			}
-			if packageSymbolRegexp.MatchString(symbol.Name) || symbol.Name == "__isr_vector" {
+			if packageSymbolRegexp.MatchString(symbol.Name) || reflectDataRegexp.MatchString(symbol.Name) {
 				addresses = append(addresses, addressLine{
 					Address:    symbol.Value,
 					Length:     symbol.Size,
@@ -490,7 +391,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				continue
 			}
 			if section.Type == elf.SHT_NOBITS {
-				if strings.HasPrefix(section.Name, ".stack") {
+				if section.Name == ".stack" {
 					// TinyGo emits stack sections on microcontroller using the
 					// ".stack" name.
 					// This is a bit ugly, but I don't think there is a way to
@@ -498,30 +399,21 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 					sections = append(sections, memorySection{
 						Address: section.Addr,
 						Size:    section.Size,
-						Align:   section.Addralign,
 						Type:    memoryStack,
 					})
-				} else if section.Flags&elf.SHF_WRITE != 0 {
-					// Regular .bss section. Zero-initialized RAM is always
-					// writable, so require SHF_WRITE here.
+				} else {
+					// Regular .bss section.
 					sections = append(sections, memorySection{
 						Address: section.Addr,
 						Size:    section.Size,
-						Align:   section.Addralign,
 						Type:    memoryBSS,
 					})
 				}
-				// Other (non-writable) SHT_NOBITS sections are address-space
-				// placeholders that occupy no RAM, such as the ESP linker
-				// script's .irom_dummy / .rodata_dummy sections which reserve
-				// the flash-mapped XIP virtual address ranges. They must not be
-				// counted as bss/RAM usage.
 			} else if section.Type == elf.SHT_PROGBITS && section.Flags&elf.SHF_EXECINSTR != 0 {
 				// .text
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    section.Size,
-					Align:   section.Addralign,
 					Type:    memoryCode,
 				})
 			} else if section.Type == elf.SHT_PROGBITS && section.Flags&elf.SHF_WRITE != 0 {
@@ -529,7 +421,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    section.Size,
-					Align:   section.Addralign,
 					Type:    memoryData,
 				})
 			} else if section.Type == elf.SHT_PROGBITS {
@@ -537,7 +428,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    section.Size,
-					Align:   section.Addralign,
 					Type:    memoryROData,
 				})
 			}
@@ -564,7 +454,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryCode,
 				})
 			} else if sectionType == 1 { // S_ZEROFILL
@@ -572,7 +461,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryBSS,
 				})
 			} else if segment.Maxprot&0b011 == 0b001 { // --r (read-only data)
@@ -580,7 +468,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryROData,
 				})
 			} else {
@@ -588,7 +475,6 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 				sections = append(sections, memorySection{
 					Address: section.Addr,
 					Size:    uint64(section.Size),
-					Align:   uint64(section.Align),
 					Type:    memoryData,
 				})
 			}
@@ -672,7 +558,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 		// Read DWARF information. The error is intentionally ignored.
 		data, _ := file.DWARF()
 		if data != nil {
-			addresses, err = readProgramSizeFromDWARF(data, 0, 0, true)
+			addresses, err = readProgramSizeFromDWARF(data, 0, true)
 			if err != nil {
 				// However, _do_ report an error here. Something must have gone
 				// wrong while trying to parse DWARF data.
@@ -744,7 +630,7 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 		// Read DWARF information. The error is intentionally ignored.
 		data, _ := file.DWARF()
 		if data != nil {
-			addresses, err = readProgramSizeFromDWARF(data, codeOffset, 0, true)
+			addresses, err = readProgramSizeFromDWARF(data, codeOffset, true)
 			if err != nil {
 				// However, _do_ report an error here. Something must have gone
 				// wrong while trying to parse DWARF data.
@@ -832,40 +718,49 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 
 	// Now finally determine the binary/RAM size usage per package by going
 	// through each allocated section.
-	sizes := make(map[string]*packageSize)
-	program := &programSize{
-		Packages: sizes,
-	}
+	sizes := make(map[string]packageSize)
 	for _, section := range sections {
 		switch section.Type {
 		case memoryCode:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
 				if isVariable {
-					return &ps.ROData
+					field.ROData += size
+				} else {
+					field.Code += size
 				}
-				return &ps.Code
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryROData:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.ROData
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
+				field.ROData += size
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryData:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.Data
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
+				field.Data += size
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryBSS:
-			readSection(section, addresses, program, func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.BSS
+			readSection(section, addresses, func(path string, size uint64, isVariable bool) {
+				field := sizes[path]
+				field.BSS += size
+				sizes[path] = field
 			}, packagePathMap)
 		case memoryStack:
 			// We store the C stack as a pseudo-package.
-			program.getPackage("C stack").addSize(func(ps *packageSize, isVariable bool) *uint64 {
-				return &ps.BSS
-			}, "", section.Size, false)
+			sizes["C stack"] = packageSize{
+				BSS: section.Size,
+			}
 		}
 	}
 
 	// ...and summarize the results.
+	program := &programSize{
+		Packages: sizes,
+	}
 	for _, pkg := range sizes {
 		program.Code += pkg.Code
 		program.ROData += pkg.ROData
@@ -876,8 +771,8 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
 }
 
 // readSection determines for each byte in this section to which package it
-// belongs.
-func readSection(section memorySection, addresses []addressLine, program *programSize, getField func(*packageSize, bool) *uint64, packagePathMap map[string]string) {
+// belongs. It reports this usage through the addSize callback.
+func readSection(section memorySection, addresses []addressLine, addSize func(string, uint64, bool), packagePathMap map[string]string) {
 	// The addr variable tracks at which address we are while going through this
 	// section. We start at the beginning.
 	addr := section.Address
@@ -895,18 +790,10 @@ func readSection(section memorySection, addresses []addressLine, program *progra
 		if addr < line.Address {
 			// There is a gap: there is a space between the current and the
 			// previous line entry.
-			// Check whether this is caused by alignment requirements.
-			addrAligned := (addr + line.Align - 1) &^ (line.Align - 1)
-			if line.Align > 1 && addrAligned >= line.Address {
-				// It is, assume that's what causes the gap.
-				program.getPackage("(padding)").addSize(getField, "", line.Address-addr, true)
-			} else {
-				program.getPackage("(unknown)").addSize(getField, "", line.Address-addr, false)
-				if sizesDebug {
-					fmt.Printf("%08x..%08x %5d:  unknown (gap), alignment=%d\n", addr, line.Address, line.Address-addr, line.Align)
-				}
+			addSize("(unknown)", line.Address-addr, false)
+			if sizesDebug {
+				fmt.Printf("%08x..%08x %5d:  unknown (gap)\n", addr, line.Address, line.Address-addr)
 			}
-			addr = line.Address
 		}
 		if addr > line.Address+line.Length {
 			// The current line is already covered by a previous line entry.
@@ -923,58 +810,35 @@ func readSection(section memorySection, addresses []addressLine, program *progra
 			length = line.Length - (addr - line.Address)
 		}
 		// Finally, mark this chunk of memory as used by the given package.
-		packagePath, filename := findPackagePath(line.File, packagePathMap)
-		program.getPackage(packagePath).addSize(getField, filename, length, line.IsVariable)
+		addSize(findPackagePath(line.File, packagePathMap), length, line.IsVariable)
 		addr = line.Address + line.Length
 	}
 	if addr < sectionEnd {
 		// There is a gap at the end of the section.
-		addrAligned := (addr + section.Align - 1) &^ (section.Align - 1)
-		if section.Align > 1 && addrAligned >= sectionEnd {
-			// The gap is caused by the section alignment.
-			// For example, if a .rodata section ends with a non-aligned string.
-			program.getPackage("(padding)").addSize(getField, "", sectionEnd-addr, true)
-		} else {
-			program.getPackage("(unknown)").addSize(getField, "", sectionEnd-addr, false)
-			if sizesDebug {
-				fmt.Printf("%08x..%08x %5d:  unknown (end), alignment=%d\n", addr, sectionEnd, sectionEnd-addr, section.Align)
-			}
+		addSize("(unknown)", sectionEnd-addr, false)
+		if sizesDebug {
+			fmt.Printf("%08x..%08x %5d:  unknown (end)\n", addr, sectionEnd, sectionEnd-addr)
 		}
 	}
 }
 
 // findPackagePath returns the Go package (or a pseudo package) for the given
 // path. It uses some heuristics, for example for some C libraries.
-func findPackagePath(path string, packagePathMap map[string]string) (packagePath, filename string) {
+func findPackagePath(path string, packagePathMap map[string]string) string {
 	// Check whether this path is part of one of the compiled packages.
 	packagePath, ok := packagePathMap[filepath.Dir(path)]
-	if ok {
-		// Directory is known as a Go package.
-		// Add the file itself as well.
-		filename = filepath.Base(path)
-	} else {
+	if !ok {
 		if strings.HasPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")) {
 			// Emit C libraries (in the lib subdirectory of TinyGo) as a single
-			// package, with a "C" prefix. For example: "C picolibc" for the
-			// baremetal libc.
-			libPath := strings.TrimPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")+string(os.PathSeparator))
-			parts := strings.SplitN(libPath, string(os.PathSeparator), 2)
-			packagePath = "C " + parts[0]
-			if len(parts) > 1 {
-				filename = parts[1]
-			} else {
-				filename = parts[0]
-			}
-		} else if prefix := filepath.Join(goenv.Get("TINYGOROOT"), "llvm-project", "compiler-rt"); strings.HasPrefix(path, prefix) {
-			packagePath = "C compiler-rt"
-			filename = strings.TrimPrefix(path, prefix+string(os.PathSeparator))
+			// package, with a "C" prefix. For example: "C compiler-rt" for the
+			// compiler runtime library from LLVM.
+			packagePath = "C " + strings.Split(strings.TrimPrefix(path, filepath.Join(goenv.Get("TINYGOROOT"), "lib")), string(os.PathSeparator))[1]
 		} else if packageSymbolRegexp.MatchString(path) {
 			// Parse symbol names like main$alloc or runtime$string.
 			packagePath = path[:strings.LastIndex(path, "$")]
-		} else if path == "__isr_vector" {
-			packagePath = "C interrupt vector"
-		} else if path == "<Go type>" {
-			packagePath = "Go types"
+		} else if reflectDataRegexp.MatchString(path) {
+			// Parse symbol names like reflect.structTypesSidetable.
+			packagePath = "Go reflect data"
 		} else if path == "<Go interface assert>" {
 			// Interface type assert, generated by the interface lowering pass.
 			packagePath = "Go interface assert"
@@ -990,11 +854,9 @@ func findPackagePath(path string, packagePathMap map[string]string) (packagePath
 			// fixed in the compiler.
 			packagePath = "-"
 		} else {
-			// This is some other path. Not sure what it is, so just emit its
-			// directory as a fallback.
-			packagePath = filepath.Dir(path)
-			filename = filepath.Base(path)
+			// This is some other path. Not sure what it is, so just emit its directory.
+			packagePath = filepath.Dir(path) // fallback
 		}
 	}
-	return
+	return packagePath
 }

builder/sizes_test.go

@@ -1,138 +0,0 @@
-package builder
-
-import (
-	"regexp"
-	"runtime"
-	"testing"
-	"time"
-
-	"github.com/tinygo-org/tinygo/compileopts"
-)
-
-var sema = make(chan struct{}, runtime.NumCPU())
-
-type sizeTest struct {
-	target     string
-	path       string
-	codeSize   uint64
-	rodataSize uint64
-	dataSize   uint64
-	bssSize    uint64
-}
-
-// Test whether code and data size is as expected for the given targets.
-// This tests both the logic of loadProgramSize and checks that code size
-// doesn't change unintentionally.
-//
-// If you find that code or data size is reduced, then great! You can reduce the
-// number in this test.
-// If you find that the code or data size is increased, take a look as to why
-// this is. It could be due to an update (LLVM version, Go version, etc) which
-// is fine, but it could also mean that a recent change introduced this size
-// increase. If so, please consider whether this new feature is indeed worth the
-// size increase for all users.
-func TestBinarySize(t *testing.T) {
-	if runtime.GOOS == "linux" && !hasBuiltinTools {
-		// Debian LLVM packages are modified a bit and tend to produce
-		// different machine code. Ideally we'd fix this (with some attributes
-		// or something?), but for now skip it.
-		t.Skip("Skip: using external LLVM version so binary size might differ")
-	}
-
-	// This is a small number of very diverse targets that we want to test.
-	tests := []sizeTest{
-		// microcontrollers
-		{"hifive1b", "examples/echo", 4313, 323, 0, 2260},
-		{"microbit", "examples/serial", 2838, 382, 8, 2256},
-		{"wioterminal", "examples/pininterrupt", 8027, 1665, 132, 7488},
-
-		// TODO: also check wasm. Right now this is difficult, because
-		// wasm binaries are run through wasm-opt and therefore the
-		// output varies by binaryen version.
-	}
-	for _, tc := range tests {
-		t.Run(tc.target+"/"+tc.path, func(t *testing.T) {
-			t.Parallel()
-
-			// Build the binary.
-			result := buildBinary(t, tc.target, tc.path)
-
-			// Check whether the size of the binary matches the expected size.
-			sizes, err := loadProgramSize(result.Executable, nil)
-			if err != nil {
-				t.Fatal("could not read program size:", err)
-			}
-			if sizes.Code != tc.codeSize || sizes.ROData != tc.rodataSize || sizes.Data != tc.dataSize || sizes.BSS != tc.bssSize {
-				t.Errorf("Unexpected code size when compiling: -target=%s %s", tc.target, tc.path)
-				t.Errorf("            code rodata   data    bss")
-				t.Errorf("expected: %6d %6d %6d %6d", tc.codeSize, tc.rodataSize, tc.dataSize, tc.bssSize)
-				t.Errorf("actual:   %6d %6d %6d %6d", sizes.Code, sizes.ROData, sizes.Data, sizes.BSS)
-			}
-		})
-	}
-}
-
-// Check that the -size=full flag attributes binary size to the correct package
-// without filesystem paths and things like that.
-func TestSizeFull(t *testing.T) {
-	tests := []string{
-		"microbit",
-		"wasip1",
-	}
-
-	libMatch := regexp.MustCompile(`^C [a-z -]+$`) // example: "C interrupt vector"
-	pkgMatch := regexp.MustCompile(`^[a-z/]+$`)    // example: "internal/task"
-
-	for _, target := range tests {
-		t.Run(target, func(t *testing.T) {
-			t.Parallel()
-
-			// Build the binary.
-			result := buildBinary(t, target, "examples/serial")
-
-			// Check whether the binary doesn't contain any unexpected package
-			// names.
-			sizes, err := loadProgramSize(result.Executable, result.PackagePathMap)
-			if err != nil {
-				t.Fatal("could not read program size:", err)
-			}
-			for _, pkg := range sizes.sortedPackageNames() {
-				if pkg == "(padding)" || pkg == "(unknown)" || pkg == "Go types" {
-					// TODO: correctly attribute all unknown binary size.
-					continue
-				}
-				if libMatch.MatchString(pkg) {
-					continue
-				}
-				if pkgMatch.MatchString(pkg) {
-					continue
-				}
-				t.Error("unexpected package name in size output:", pkg)
-			}
-		})
-	}
-}
-
-func buildBinary(t *testing.T, targetString, pkgName string) BuildResult {
-	options := compileopts.Options{
-		Target:        targetString,
-		Opt:           "z",
-		Semaphore:     sema,
-		InterpTimeout: 60 * time.Second,
-		Debug:         true,
-		VerifyIR:      true,
-	}
-	target, err := compileopts.LoadTarget(&options)
-	if err != nil {
-		t.Fatal("could not load target:", err)
-	}
-	config := &compileopts.Config{
-		Options: &options,
-		Target:  target,
-	}
-	result, err := Build(pkgName, "", t.TempDir(), config)
-	if err != nil {
-		t.Fatal("could not build:", err)
-	}
-	return result
-}

builder/tools-builtin.go

@@ -12,7 +12,10 @@ import (
 #include <stdbool.h>
 #include <stdlib.h>
 bool tinygo_clang_driver(int argc, char **argv);
-bool tinygo_link(int argc, char **argv);
+bool tinygo_link_elf(int argc, char **argv);
+bool tinygo_link_macho(int argc, char **argv);
+bool tinygo_link_mingw(int argc, char **argv);
+bool tinygo_link_wasm(int argc, char **argv);
 */
 import "C"
 
@@ -23,12 +26,21 @@ const hasBuiltinTools = true
 // This version actually runs the tools because TinyGo was compiled while
 // linking statically with LLVM (with the byollvm build tag).
 func RunTool(tool string, args ...string) error {
-	args = append([]string{tool}, args...)
+	linker := "elf"
+	if tool == "ld.lld" && len(args) >= 2 {
+		if args[0] == "-m" && (args[1] == "i386pep" || args[1] == "arm64pe") {
+			linker = "mingw"
+		} else if args[0] == "-flavor" {
+			linker = args[1]
+			args = args[2:]
+		}
+	}
+	args = append([]string{"tinygo:" + tool}, args...)
 
 	var cflag *C.char
 	buf := C.calloc(C.size_t(len(args)), C.size_t(unsafe.Sizeof(cflag)))
 	defer C.free(buf)
-	cflags := unsafe.Slice((**C.char)(buf), len(args))
+	cflags := (*[1 << 10]*C.char)(unsafe.Pointer(buf))[:len(args):len(args)]
 	for i, flag := range args {
 		cflag := C.CString(flag)
 		cflags[i] = cflag
@@ -39,8 +51,19 @@ func RunTool(tool string, args ...string) error {
 	switch tool {
 	case "clang":
 		ok = C.tinygo_clang_driver(C.int(len(args)), (**C.char)(buf))
-	case "ld.lld", "wasm-ld":
-		ok = C.tinygo_link(C.int(len(args)), (**C.char)(buf))
+	case "ld.lld":
+		switch linker {
+		case "darwin":
+			ok = C.tinygo_link_macho(C.int(len(args)), (**C.char)(buf))
+		case "elf":
+			ok = C.tinygo_link_elf(C.int(len(args)), (**C.char)(buf))
+		case "mingw":
+			ok = C.tinygo_link_mingw(C.int(len(args)), (**C.char)(buf))
+		default:
+			return errors.New("unknown linker: " + linker)
+		}
+	case "wasm-ld":
+		ok = C.tinygo_link_wasm(C.int(len(args)), (**C.char)(buf))
 	default:
 		return errors.New("unknown tool: " + tool)
 	}

builder/tools.go

@@ -1,197 +1,50 @@
 package builder
 
 import (
-	"bytes"
-	"fmt"
-	"go/scanner"
-	"go/token"
+	"errors"
 	"os"
 	"os/exec"
-	"regexp"
-	"strconv"
-	"strings"
+
+	"github.com/tinygo-org/tinygo/goenv"
 )
 
 // runCCompiler invokes a C compiler with the given arguments.
 func runCCompiler(flags ...string) error {
-	// Find the right command to run Clang.
-	var cmd *exec.Cmd
 	if hasBuiltinTools {
 		// Compile this with the internal Clang compiler.
-		cmd = exec.Command(os.Args[0], append([]string{"clang"}, flags...)...)
-	} else {
-		// Compile this with an external invocation of the Clang compiler.
-		name, err := LookupCommand("clang")
-		if err != nil {
-			return err
+		headerPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
+		if headerPath == "" {
+			return errors.New("could not locate Clang headers")
 		}
-		cmd = exec.Command(name, flags...)
+		flags = append(flags, "-I"+headerPath)
+		cmd := exec.Command(os.Args[0], append([]string{"clang"}, flags...)...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		return cmd.Run()
 	}
 
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-
-	// Make sure the command doesn't use any environmental variables.
-	// Most importantly, it should not use C_INCLUDE_PATH and the like.
-	cmd.Env = []string{}
-
-	// Let some environment variables through. One important one is the
-	// temporary directory, especially on Windows it looks like Clang breaks if
-	// the temporary directory has not been set.
-	// See: https://github.com/tinygo-org/tinygo/issues/4557
-	// Also see: https://github.com/llvm/llvm-project/blob/release/18.x/llvm/lib/Support/Unix/Path.inc#L1435
-	for _, env := range os.Environ() {
-		// We could parse the key and look it up in a map, but since there are
-		// only a few keys iterating through them is easier and maybe even
-		// faster.
-		for _, prefix := range []string{"TMPDIR=", "TMP=", "TEMP=", "TEMPDIR="} {
-			if strings.HasPrefix(env, prefix) {
-				cmd.Env = append(cmd.Env, env)
-				break
-			}
-		}
-	}
-
-	return cmd.Run()
+	// Compile this with an external invocation of the Clang compiler.
+	return execCommand("clang", flags...)
 }
 
 // link invokes a linker with the given name and flags.
 func link(linker string, flags ...string) error {
-	// We only support LLD.
-	if linker != "ld.lld" && linker != "wasm-ld" {
-		return fmt.Errorf("unexpected: linker %s should be ld.lld or wasm-ld", linker)
+	if hasBuiltinTools && (linker == "ld.lld" || linker == "wasm-ld") {
+		// Run command with internal linker.
+		cmd := exec.Command(os.Args[0], append([]string{linker}, flags...)...)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		return cmd.Run()
 	}
 
-	var cmd *exec.Cmd
-	if hasBuiltinTools {
-		cmd = exec.Command(os.Args[0], append([]string{linker}, flags...)...)
-	} else {
-		name, err := LookupCommand(linker)
-		if err != nil {
-			return err
-		}
-		cmd = exec.Command(name, flags...)
+	// Fall back to external command.
+	if _, ok := commands[linker]; ok {
+		return execCommand(linker, flags...)
 	}
-	var buf bytes.Buffer
+
+	cmd := exec.Command(linker, flags...)
 	cmd.Stdout = os.Stdout
-	cmd.Stderr = &buf
-	err := cmd.Run()
-	if err != nil {
-		if buf.Len() == 0 {
-			// The linker failed but there was no output.
-			// Therefore, show some output anyway.
-			return fmt.Errorf("failed to run linker: %w", err)
-		}
-		return parseLLDErrors(buf.String())
-	}
-	return nil
-}
-
-// Split LLD errors into individual erros (including errors that continue on the
-// next line, using a ">>>" prefix). If possible, replace the raw errors with a
-// more user-friendly version (and one that's more in a Go style).
-func parseLLDErrors(text string) error {
-	// Split linker output in separate error messages.
-	lines := strings.Split(text, "\n")
-	var errorLines []string // one or more line (belonging to a single error) per line
-	for _, line := range lines {
-		line = strings.TrimRight(line, "\r") // needed for Windows
-		if len(errorLines) != 0 && strings.HasPrefix(line, ">>> ") {
-			errorLines[len(errorLines)-1] += "\n" + line
-			continue
-		}
-		if line == "" {
-			continue
-		}
-		errorLines = append(errorLines, line)
-	}
-
-	// Parse error messages.
-	var linkErrors []error
-	var flashOverflow, ramOverflow uint64
-	for _, message := range errorLines {
-		parsedError := false
-
-		// Check for undefined symbols.
-		// This can happen in some cases like with CGo and //go:linkname tricker.
-		if matches := regexp.MustCompile(`^ld.lld(-[0-9]+)?: error: undefined symbol: (.*)\n`).FindStringSubmatch(message); matches != nil {
-			symbolName := matches[2]
-			for line := range strings.SplitSeq(message, "\n") {
-				matches := regexp.MustCompile(`referenced by .* \(((.*):([0-9]+))\)`).FindStringSubmatch(line)
-				if matches != nil {
-					parsedError = true
-					line, _ := strconv.Atoi(matches[3])
-					msg := "linker could not find symbol " + symbolName
-					switch symbolName {
-					case "runtime.alloc":
-						msg = "object allocated on the heap with -gc=none"
-					case "runtime.alloc_noheap":
-						msg = "object allocated on the heap in //go:noheap function"
-					}
-					linkErrors = append(linkErrors, scanner.Error{
-						Pos: token.Position{
-							Filename: matches[2],
-							Line:     line,
-						},
-						Msg: msg,
-					})
-				}
-			}
-		}
-
-		// Check for flash/RAM overflow.
-		if matches := regexp.MustCompile(`^ld.lld(-[0-9]+)?: error: section '(.*?)' will not fit in region '(.*?)': overflowed by ([0-9]+) bytes$`).FindStringSubmatch(message); matches != nil {
-			region := matches[3]
-			n, err := strconv.ParseUint(matches[4], 10, 64)
-			if err != nil {
-				// Should not happen at all (unless it overflows an uint64 for some reason).
-				continue
-			}
-
-			// Check which area overflowed.
-			// Some chips use differently named memory areas, but these are by
-			// far the most common.
-			switch region {
-			case "FLASH_TEXT":
-				if n > flashOverflow {
-					flashOverflow = n
-				}
-				parsedError = true
-			case "RAM":
-				if n > ramOverflow {
-					ramOverflow = n
-				}
-				parsedError = true
-			}
-		}
-
-		// If we couldn't parse the linker error: show the error as-is to
-		// the user.
-		if !parsedError {
-			linkErrors = append(linkErrors, LinkerError{message})
-		}
-	}
-
-	if flashOverflow > 0 {
-		linkErrors = append(linkErrors, LinkerError{
-			Msg: fmt.Sprintf("program too large for this chip (flash overflowed by %d bytes)\n\toptimization guide: https://tinygo.org/docs/guides/optimizing-binaries/", flashOverflow),
-		})
-	}
-	if ramOverflow > 0 {
-		linkErrors = append(linkErrors, LinkerError{
-			Msg: fmt.Sprintf("program uses too much static RAM on this chip (RAM overflowed by %d bytes)", ramOverflow),
-		})
-	}
-
-	return newMultiError(linkErrors, "")
-}
-
-// LLD linker error that could not be parsed or doesn't refer to a source
-// location.
-type LinkerError struct {
-	Msg string
-}
-
-func (e LinkerError) Error() string {
-	return e.Msg
+	cmd.Stderr = os.Stderr
+	cmd.Dir = goenv.Get("TINYGOROOT")
+	return cmd.Run()
 }

builder/uf2.go

@@ -40,7 +40,7 @@ func convertBinToUF2(input []byte, targetAddr uint32, uf2FamilyID string) ([]byt
 	}
 	bl.SetNumBlocks(len(blocks))
 
-	for i := range blocks {
+	for i := 0; i < len(blocks); i++ {
 		bl.SetBlockNo(i)
 		bl.SetData(blocks[i])
 

builder/wasilibc.go

@@ -1,284 +0,0 @@
-package builder
-
-import (
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var libWasiLibc = Library{
-	name: "wasi-libc",
-	makeHeaders: func(target, includeDir string) error {
-		bits := filepath.Join(includeDir, "bits")
-		err := os.Mkdir(bits, 0777)
-		if err != nil {
-			return err
-		}
-
-		muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "wasi-libc/libc-top-half/musl")
-		err = buildMuslAllTypes("wasm32", muslDir, bits)
-		if err != nil {
-			return err
-		}
-
-		// See MUSL_OMIT_HEADERS in the Makefile.
-		omitHeaders := map[string]struct{}{
-			"syslog.h":   {},
-			"wait.h":     {},
-			"ucontext.h": {},
-			"paths.h":    {},
-			"utmp.h":     {},
-			"utmpx.h":    {},
-			"lastlog.h":  {},
-			"elf.h":      {},
-			"link.h":     {},
-			"pwd.h":      {},
-			"shadow.h":   {},
-			"grp.h":      {},
-			"mntent.h":   {},
-			"netdb.h":    {},
-			"resolv.h":   {},
-			"pty.h":      {},
-			"dlfcn.h":    {},
-			"setjmp.h":   {},
-			"ulimit.h":   {},
-			"wordexp.h":  {},
-			"spawn.h":    {},
-			"termios.h":  {},
-			"libintl.h":  {},
-			"aio.h":      {},
-
-			"stdarg.h": {},
-			"stddef.h": {},
-
-			"pthread.h": {},
-		}
-
-		for _, glob := range [][2]string{
-			{"libc-bottom-half/headers/public/*.h", ""},
-			{"libc-bottom-half/headers/public/wasi/*.h", "wasi"},
-			{"libc-top-half/musl/arch/wasm32/bits/*.h", "bits"},
-			{"libc-top-half/musl/include/*.h", ""},
-			{"libc-top-half/musl/include/netinet/*.h", "netinet"},
-			{"libc-top-half/musl/include/sys/*.h", "sys"},
-		} {
-			matches, _ := filepath.Glob(filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc", glob[0]))
-			outDir := filepath.Join(includeDir, glob[1])
-			os.MkdirAll(outDir, 0o777)
-			for _, match := range matches {
-				name := filepath.Base(match)
-				if _, ok := omitHeaders[name]; ok {
-					continue
-				}
-				data, err := os.ReadFile(match)
-				if err != nil {
-					return err
-				}
-				err = os.WriteFile(filepath.Join(outDir, name), data, 0o666)
-				if err != nil {
-					return err
-				}
-			}
-		}
-
-		return nil
-	},
-	cflags: func(target, headerPath string) []string {
-		libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
-		return []string{
-			"-Werror",
-			"-Wall",
-			"-std=gnu11",
-			"-nostdlibinc",
-			"-mnontrapping-fptoint", "-msign-ext", "-mbulk-memory",
-			"-Wno-null-pointer-arithmetic", "-Wno-unused-parameter", "-Wno-sign-compare", "-Wno-unused-variable", "-Wno-unused-function", "-Wno-ignored-attributes", "-Wno-missing-braces", "-Wno-ignored-pragmas", "-Wno-unused-but-set-variable", "-Wno-unknown-warning-option",
-			"-Wno-parentheses", "-Wno-shift-op-parentheses", "-Wno-bitwise-op-parentheses", "-Wno-logical-op-parentheses", "-Wno-string-plus-int", "-Wno-dangling-else", "-Wno-unknown-pragmas",
-			"-DNDEBUG",
-			"-D__wasilibc_printscan_no_long_double",
-			"-D__wasilibc_printscan_full_support_option=\"long double support is disabled\"",
-			"-DBULK_MEMORY_THRESHOLD=32", // default threshold in wasi-libc
-			"-isystem", headerPath,
-			"-I" + libcDir + "/libc-top-half/musl/src/include",
-			"-I" + libcDir + "/libc-top-half/musl/src/internal",
-			"-I" + libcDir + "/libc-top-half/musl/arch/wasm32",
-			"-I" + libcDir + "/libc-top-half/musl/arch/generic",
-			"-I" + libcDir + "/libc-top-half/headers/private",
-		}
-	},
-	cflagsForFile: func(path string) []string {
-		if strings.HasPrefix(path, "libc-bottom-half"+string(os.PathSeparator)) {
-			libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
-			return []string{
-				"-I" + libcDir + "/libc-bottom-half/headers/private",
-				"-I" + libcDir + "/libc-bottom-half/cloudlibc/src/include",
-				"-I" + libcDir + "/libc-bottom-half/cloudlibc/src",
-			}
-		}
-		return nil
-	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc") },
-	librarySources: func(target string, libcNeedsMalloc bool) ([]string, error) {
-		type filePattern struct {
-			glob    string
-			exclude []string
-		}
-
-		// See: LIBC_TOP_HALF_MUSL_SOURCES in the Makefile
-		globs := []filePattern{
-			// Top half: mostly musl sources.
-			{glob: "libc-top-half/sources/*.c"},
-			{glob: "libc-top-half/musl/src/conf/*.c"},
-			{glob: "libc-top-half/musl/src/internal/*.c", exclude: []string{
-				"procfdname.c", "syscall.c", "syscall_ret.c", "vdso.c", "version.c",
-			}},
-			{glob: "libc-top-half/musl/src/locale/*.c", exclude: []string{
-				"dcngettext.c", "textdomain.c", "bind_textdomain_codeset.c"}},
-			{glob: "libc-top-half/musl/src/math/*.c", exclude: []string{
-				"__signbit.c", "__signbitf.c", "__signbitl.c",
-				"__fpclassify.c", "__fpclassifyf.c", "__fpclassifyl.c",
-				"ceilf.c", "ceil.c",
-				"floorf.c", "floor.c",
-				"truncf.c", "trunc.c",
-				"rintf.c", "rint.c",
-				"nearbyintf.c", "nearbyint.c",
-				"sqrtf.c", "sqrt.c",
-				"fabsf.c", "fabs.c",
-				"copysignf.c", "copysign.c",
-				"fminf.c", "fmaxf.c",
-				"fmin.c", "fmax.c,",
-			}},
-			{glob: "libc-top-half/musl/src/multibyte/*.c"},
-			{glob: "libc-top-half/musl/src/stdio/*.c", exclude: []string{
-				"vfwscanf.c", "vfwprintf.c", // long double is unsupported
-				"__lockfile.c", "flockfile.c", "funlockfile.c", "ftrylockfile.c",
-				"rename.c",
-				"tmpnam.c", "tmpfile.c", "tempnam.c",
-				"popen.c", "pclose.c",
-				"remove.c",
-				"gets.c"}},
-			{glob: "libc-top-half/musl/src/stdlib/*.c"},
-			{glob: "libc-top-half/musl/src/string/*.c", exclude: []string{
-				"strsignal.c"}},
-
-			// Bottom half: connect top half to WASI equivalents.
-			{glob: "libc-bottom-half/cloudlibc/src/libc/*/*.c"},
-			{glob: "libc-bottom-half/cloudlibc/src/libc/sys/*/*.c"},
-			{glob: "libc-bottom-half/sources/*.c"},
-		}
-
-		// We're using the Boehm GC, so we need a heap implementation in the libc.
-		if libcNeedsMalloc {
-			globs = append(globs, filePattern{glob: "dlmalloc/src/dlmalloc.c"})
-		}
-
-		// See: LIBC_TOP_HALF_MUSL_SOURCES in the Makefile
-		sources := []string{
-			"libc-top-half/musl/src/misc/a64l.c",
-			"libc-top-half/musl/src/misc/basename.c",
-			"libc-top-half/musl/src/misc/dirname.c",
-			"libc-top-half/musl/src/misc/ffs.c",
-			"libc-top-half/musl/src/misc/ffsl.c",
-			"libc-top-half/musl/src/misc/ffsll.c",
-			"libc-top-half/musl/src/misc/fmtmsg.c",
-			"libc-top-half/musl/src/misc/getdomainname.c",
-			"libc-top-half/musl/src/misc/gethostid.c",
-			"libc-top-half/musl/src/misc/getopt.c",
-			"libc-top-half/musl/src/misc/getopt_long.c",
-			"libc-top-half/musl/src/misc/getsubopt.c",
-			"libc-top-half/musl/src/misc/uname.c",
-			"libc-top-half/musl/src/misc/nftw.c",
-			"libc-top-half/musl/src/errno/strerror.c",
-			"libc-top-half/musl/src/network/htonl.c",
-			"libc-top-half/musl/src/network/htons.c",
-			"libc-top-half/musl/src/network/ntohl.c",
-			"libc-top-half/musl/src/network/ntohs.c",
-			"libc-top-half/musl/src/network/inet_ntop.c",
-			"libc-top-half/musl/src/network/inet_pton.c",
-			"libc-top-half/musl/src/network/inet_aton.c",
-			"libc-top-half/musl/src/network/in6addr_any.c",
-			"libc-top-half/musl/src/network/in6addr_loopback.c",
-			"libc-top-half/musl/src/fenv/fenv.c",
-			"libc-top-half/musl/src/fenv/fesetround.c",
-			"libc-top-half/musl/src/fenv/feupdateenv.c",
-			"libc-top-half/musl/src/fenv/fesetexceptflag.c",
-			"libc-top-half/musl/src/fenv/fegetexceptflag.c",
-			"libc-top-half/musl/src/fenv/feholdexcept.c",
-			"libc-top-half/musl/src/exit/exit.c",
-			"libc-top-half/musl/src/exit/atexit.c",
-			"libc-top-half/musl/src/exit/assert.c",
-			"libc-top-half/musl/src/exit/quick_exit.c",
-			"libc-top-half/musl/src/exit/at_quick_exit.c",
-			"libc-top-half/musl/src/time/strftime.c",
-			"libc-top-half/musl/src/time/asctime.c",
-			"libc-top-half/musl/src/time/asctime_r.c",
-			"libc-top-half/musl/src/time/ctime.c",
-			"libc-top-half/musl/src/time/ctime_r.c",
-			"libc-top-half/musl/src/time/wcsftime.c",
-			"libc-top-half/musl/src/time/strptime.c",
-			"libc-top-half/musl/src/time/difftime.c",
-			"libc-top-half/musl/src/time/timegm.c",
-			"libc-top-half/musl/src/time/ftime.c",
-			"libc-top-half/musl/src/time/gmtime.c",
-			"libc-top-half/musl/src/time/gmtime_r.c",
-			"libc-top-half/musl/src/time/timespec_get.c",
-			"libc-top-half/musl/src/time/getdate.c",
-			"libc-top-half/musl/src/time/localtime.c",
-			"libc-top-half/musl/src/time/localtime_r.c",
-			"libc-top-half/musl/src/time/mktime.c",
-			"libc-top-half/musl/src/time/__tm_to_secs.c",
-			"libc-top-half/musl/src/time/__month_to_secs.c",
-			"libc-top-half/musl/src/time/__secs_to_tm.c",
-			"libc-top-half/musl/src/time/__year_to_secs.c",
-			"libc-top-half/musl/src/time/__tz.c",
-			"libc-top-half/musl/src/fcntl/creat.c",
-			"libc-top-half/musl/src/dirent/alphasort.c",
-			"libc-top-half/musl/src/dirent/versionsort.c",
-			"libc-top-half/musl/src/env/__stack_chk_fail.c",
-			"libc-top-half/musl/src/env/clearenv.c",
-			"libc-top-half/musl/src/env/getenv.c",
-			"libc-top-half/musl/src/env/putenv.c",
-			"libc-top-half/musl/src/env/setenv.c",
-			"libc-top-half/musl/src/env/unsetenv.c",
-			"libc-top-half/musl/src/unistd/posix_close.c",
-			"libc-top-half/musl/src/stat/futimesat.c",
-			"libc-top-half/musl/src/legacy/getpagesize.c",
-			"libc-top-half/musl/src/thread/thrd_sleep.c",
-		}
-
-		basepath := goenv.Get("TINYGOROOT") + "/lib/wasi-libc/"
-		for _, pattern := range globs {
-			matches, err := filepath.Glob(basepath + pattern.glob)
-			if err != nil {
-				// From the documentation:
-				// > Glob ignores file system errors such as I/O errors reading
-				// > directories. The only possible returned error is
-				// > ErrBadPattern, when pattern is malformed.
-				// So the only possible error is when the (statically defined)
-				// pattern is wrong. In other words, a programming bug.
-				return nil, fmt.Errorf("wasi-libc: could not glob source dirs: %w", err)
-			}
-			if len(matches) == 0 {
-				return nil, fmt.Errorf("wasi-libc: did not find any files for pattern %#v", pattern)
-			}
-			excludeSet := map[string]struct{}{}
-			for _, exclude := range pattern.exclude {
-				excludeSet[exclude] = struct{}{}
-			}
-			for _, match := range matches {
-				if _, ok := excludeSet[filepath.Base(match)]; ok {
-					continue
-				}
-				relpath, err := filepath.Rel(basepath, match)
-				if err != nil {
-					// Not sure if this is even possible.
-					return nil, err
-				}
-				sources = append(sources, relpath)
-			}
-		}
-		return sources, nil
-	},
-}

builder/wasmbuiltins.go

@@ -1,83 +0,0 @@
-package builder
-
-import (
-	"os"
-	"path/filepath"
-
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var libWasmBuiltins = Library{
-	name: "wasmbuiltins",
-	makeHeaders: func(target, includeDir string) error {
-		if err := os.Mkdir(includeDir+"/bits", 0o777); err != nil {
-			return err
-		}
-		f, err := os.Create(includeDir + "/bits/alltypes.h")
-		if err != nil {
-			return err
-		}
-		if _, err := f.Write([]byte(wasmAllTypes)); err != nil {
-			return err
-		}
-		return f.Close()
-	},
-	cflags: func(target, headerPath string) []string {
-		libcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc")
-		return []string{
-			"-Werror",
-			"-Wall",
-			"-std=gnu11",
-			"-nostdlibinc",
-			"-mnontrapping-fptoint", // match wasm-unknown (default on in LLVM 20)
-			"-mno-bulk-memory",      // same here
-			"-isystem", libcDir + "/libc-top-half/musl/arch/wasm32",
-			"-isystem", libcDir + "/libc-top-half/musl/arch/generic",
-			"-isystem", libcDir + "/libc-top-half/musl/src/internal",
-			"-isystem", libcDir + "/libc-top-half/musl/src/include",
-			"-isystem", libcDir + "/libc-top-half/musl/include",
-			"-isystem", libcDir + "/libc-bottom-half/headers/public",
-			"-I" + headerPath,
-		}
-	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/wasi-libc") },
-	librarySources: func(target string, _ bool) ([]string, error) {
-		return []string{
-			// memory builtins needed for llvm.memcpy.*, llvm.memmove.*, and
-			// llvm.memset.* LLVM intrinsics.
-			"libc-top-half/musl/src/string/memcpy.c",
-			"libc-top-half/musl/src/string/memmove.c",
-			"libc-top-half/musl/src/string/memset.c",
-
-			// exp, exp2, and log are needed for LLVM math builtin functions
-			// like llvm.exp.*.
-			"libc-top-half/musl/src/math/__math_divzero.c",
-			"libc-top-half/musl/src/math/__math_invalid.c",
-			"libc-top-half/musl/src/math/__math_oflow.c",
-			"libc-top-half/musl/src/math/__math_uflow.c",
-			"libc-top-half/musl/src/math/__math_xflow.c",
-			"libc-top-half/musl/src/math/exp.c",
-			"libc-top-half/musl/src/math/exp_data.c",
-			"libc-top-half/musl/src/math/exp2.c",
-			"libc-top-half/musl/src/math/log.c",
-			"libc-top-half/musl/src/math/log_data.c",
-		}, nil
-	},
-}
-
-// alltypes.h for wasm-libc, using the types as defined inside Clang.
-const wasmAllTypes = `
-typedef __SIZE_TYPE__    size_t;
-typedef __INT8_TYPE__    int8_t;
-typedef __INT16_TYPE__   int16_t;
-typedef __INT32_TYPE__   int32_t;
-typedef __INT64_TYPE__   int64_t;
-typedef __UINT8_TYPE__   uint8_t;
-typedef __UINT16_TYPE__  uint16_t;
-typedef __UINT32_TYPE__  uint32_t;
-typedef __UINT64_TYPE__  uint64_t;
-typedef __UINTPTR_TYPE__ uintptr_t;
-
-// This type is used internally in wasi-libc.
-typedef double double_t;
-`

cgo/cgo.go

@@ -18,7 +18,6 @@ import (
 	"go/scanner"
 	"go/token"
 	"path/filepath"
-	"sort"
 	"strconv"
 	"strings"
 
@@ -29,8 +28,6 @@ import (
 // cgoPackage holds all CGo-related information of a package.
 type cgoPackage struct {
 	generated       *ast.File
-	packageName     string
-	cgoFiles        []*ast.File
 	generatedPos    token.Pos
 	errors          []error
 	currentDir      string // current working directory
@@ -39,8 +36,7 @@ type cgoPackage struct {
 	fset            *token.FileSet
 	tokenFiles      map[string]*token.File
 	definedGlobally map[string]ast.Node
-	noescapingFuncs map[string]*noescapingFunc // #cgo noescape lines
-	anonDecls       map[any]string
+	anonDecls       map[interface{}]string
 	cflags          []string // CFlags from #cgo lines
 	ldflags         []string // LDFlags from #cgo lines
 	visitedFiles    map[string][]byte
@@ -78,28 +74,20 @@ type bitfieldInfo struct {
 	endBit   int64 // may be 0 meaning "until the end of the field"
 }
 
-// Information about a #cgo noescape line in the source code.
-type noescapingFunc struct {
-	name string
-	pos  token.Pos
-	used bool // true if used somewhere in the source (for proper error reporting)
-}
-
 // cgoAliases list type aliases between Go and C, for types that are equivalent
 // in both languages. See addTypeAliases.
 var cgoAliases = map[string]string{
-	"_Cgo_int8_t":    "int8",
-	"_Cgo_int16_t":   "int16",
-	"_Cgo_int32_t":   "int32",
-	"_Cgo_int64_t":   "int64",
-	"_Cgo_uint8_t":   "uint8",
-	"_Cgo_uint16_t":  "uint16",
-	"_Cgo_uint32_t":  "uint32",
-	"_Cgo_uint64_t":  "uint64",
-	"_Cgo_uintptr_t": "uintptr",
-	"_Cgo_float":     "float32",
-	"_Cgo_double":    "float64",
-	"_Cgo__Bool":     "bool",
+	"C.int8_t":    "int8",
+	"C.int16_t":   "int16",
+	"C.int32_t":   "int32",
+	"C.int64_t":   "int64",
+	"C.uint8_t":   "uint8",
+	"C.uint16_t":  "uint16",
+	"C.uint32_t":  "uint32",
+	"C.uint64_t":  "uint64",
+	"C.uintptr_t": "uintptr",
+	"C.float":     "float32",
+	"C.double":    "float64",
 }
 
 // builtinAliases are handled specially because they only exist on the Go side
@@ -141,105 +129,31 @@ typedef unsigned long long  _Cgo_ulonglong;
 // The string/bytes functions below implement C.CString etc. To make sure the
 // runtime doesn't need to know the C int type, lengths are converted to uintptr
 // first.
-const generatedGoFilePrefixBase = `
-import "syscall"
+// These functions will be modified to get a "C." prefix, so the source below
+// doesn't reflect the final AST.
+const generatedGoFilePrefix = `
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func __GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func __GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-`
-
-const generatedGoFilePrefixOther = generatedGoFilePrefixBase + `
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
-}
-`
-
-// Windows uses fake errno values in the syscall package.
-// See for example: https://github.com/golang/go/issues/23468
-// TinyGo uses mingw-w64 though, which does have defined errno values. Since the
-// syscall package is the standard library one we can't change it, but we can
-// map the errno values to match the values in the syscall package.
-// Source of the errno values: lib/mingw-w64/mingw-w64-headers/crt/errno.h
-const generatedGoFilePrefixWindows = generatedGoFilePrefixBase + `
-var _Cgo___errno_mapping = [...]syscall.Errno{
-	1:  syscall.EPERM,
-	2:  syscall.ENOENT,
-	3:  syscall.ESRCH,
-	4:  syscall.EINTR,
-	5:  syscall.EIO,
-	6:  syscall.ENXIO,
-	7:  syscall.E2BIG,
-	8:  syscall.ENOEXEC,
-	9:  syscall.EBADF,
-	10: syscall.ECHILD,
-	11: syscall.EAGAIN,
-	12: syscall.ENOMEM,
-	13: syscall.EACCES,
-	14: syscall.EFAULT,
-	16: syscall.EBUSY,
-	17: syscall.EEXIST,
-	18: syscall.EXDEV,
-	19: syscall.ENODEV,
-	20: syscall.ENOTDIR,
-	21: syscall.EISDIR,
-	22: syscall.EINVAL,
-	23: syscall.ENFILE,
-	24: syscall.EMFILE,
-	25: syscall.ENOTTY,
-	27: syscall.EFBIG,
-	28: syscall.ENOSPC,
-	29: syscall.ESPIPE,
-	30: syscall.EROFS,
-	31: syscall.EMLINK,
-	32: syscall.EPIPE,
-	33: syscall.EDOM,
-	34: syscall.ERANGE,
-	36: syscall.EDEADLK,
-	38: syscall.ENAMETOOLONG,
-	39: syscall.ENOLCK,
-	40: syscall.ENOSYS,
-	41: syscall.ENOTEMPTY,
-	42: syscall.EILSEQ,
-}
-
-func _Cgo___get_errno() error {
-	num := _Cgo___get_errno_num()
-	if num < uintptr(len(_Cgo___errno_mapping)) {
-		if mapped := _Cgo___errno_mapping[num]; mapped != 0 {
-			return mapped
-		}
-	}
-	return syscall.Errno(num)
+func GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 `
 
@@ -250,16 +164,14 @@ func _Cgo___get_errno() error {
 // functions), the CFLAGS and LDFLAGS found in #cgo lines, and a map of file
 // hashes of the accessed C header files. If there is one or more error, it
 // returns these in the []error slice but still modifies the AST.
-func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cflags []string, goos string) ([]*ast.File, []string, []string, []string, map[string][]byte, []error) {
+func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cflags []string, clangHeaders string) (*ast.File, []string, []string, []string, map[string][]byte, []error) {
 	p := &cgoPackage{
-		packageName:     files[0].Name.Name,
 		currentDir:      dir,
 		importPath:      importPath,
 		fset:            fset,
 		tokenFiles:      map[string]*token.File{},
 		definedGlobally: map[string]ast.Node{},
-		noescapingFuncs: map[string]*noescapingFunc{},
-		anonDecls:       map[any]string{},
+		anonDecls:       map[interface{}]string{},
 		visitedFiles:    map[string][]byte{},
 	}
 
@@ -283,26 +195,37 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// Construct a new in-memory AST for CGo declarations of this package.
 	// The first part is written as Go code that is then parsed, but more code
 	// is added later to the AST to declare functions, globals, etc.
-	goCode := "package " + files[0].Name.Name + "\n\n"
-	if goos == "windows" {
-		goCode += generatedGoFilePrefixWindows
-	} else {
-		goCode += generatedGoFilePrefixOther
-	}
+	goCode := "package " + files[0].Name.Name + "\n\n" + generatedGoFilePrefix
 	p.generated, err = parser.ParseFile(fset, dir+"/!cgo.go", goCode, parser.ParseComments)
 	if err != nil {
 		// This is always a bug in the cgo package.
 		panic("unexpected error: " + err.Error())
 	}
-	p.cgoFiles = append(p.cgoFiles, p.generated)
 	// If the Comments field is not set to nil, the go/format package will get
 	// confused about where comments should go.
 	p.generated.Comments = nil
+	// Adjust some of the functions in there.
+	for _, decl := range p.generated.Decls {
+		switch decl := decl.(type) {
+		case *ast.FuncDecl:
+			switch decl.Name.Name {
+			case "CString", "GoString", "GoStringN", "__GoStringN", "GoBytes", "__GoBytes":
+				// Adjust the name to have a "C." prefix so it is correctly
+				// resolved.
+				decl.Name.Name = "C." + decl.Name.Name
+			}
+		}
+	}
+	// Patch some types, for example *C.char in C.CString.
+	cf := p.newCGoFile(nil, -1) // dummy *cgoFile for the walker
+	astutil.Apply(p.generated, func(cursor *astutil.Cursor) bool {
+		return cf.walker(cursor, nil)
+	}, nil)
 
 	// Find `import "C"` C fragments in the file.
 	p.cgoHeaders = make([]string, len(files)) // combined CGo header fragment for each file
 	for i, f := range files {
-		var cgoHeader strings.Builder
+		var cgoHeader string
 		for i := 0; i < len(f.Decls); i++ {
 			decl := f.Decls[i]
 			genDecl, ok := decl.(*ast.GenDecl)
@@ -337,8 +260,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 			// Iterate through all parts of the CGo header. Note that every //
 			// line is a new comment.
 			position := fset.Position(genDecl.Doc.Pos())
-			var fragment strings.Builder
-			fragment.WriteString(fmt.Sprintf("# %d %#v\n", position.Line, position.Filename))
+			fragment := fmt.Sprintf("# %d %#v\n", position.Line, position.Filename)
 			for _, comment := range genDecl.Doc.List {
 				// Find all #cgo lines, extract and use their contents, and
 				// replace the lines with spaces (to preserve locations).
@@ -355,13 +277,12 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 				} else { // comment
 					c = "  " + c[2:len(c)-2]
 				}
-				fragment.WriteString(c)
-				fragment.WriteByte('\n')
+				fragment += c + "\n"
 			}
-			cgoHeader.WriteString(fragment.String())
+			cgoHeader += fragment
 		}
 
-		p.cgoHeaders[i] = cgoHeader.String()
+		p.cgoHeaders[i] = cgoHeader
 	}
 
 	// Define CFlags that will be used while parsing the package.
@@ -370,6 +291,9 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// have better alternatives anyway.
 	cflagsForCGo := append([]string{"-D_FORTIFY_SOURCE=0"}, cflags...)
 	cflagsForCGo = append(cflagsForCGo, p.cflags...)
+	if clangHeaders != "" {
+		cflagsForCGo = append(cflagsForCGo, "-isystem", clangHeaders)
+	}
 
 	// Retrieve types such as C.int, C.longlong, etc from C.
 	p.newCGoFile(nil, -1).readNames(builtinAliasTypedefs, cflagsForCGo, "", func(names map[string]clangCursor) {
@@ -378,7 +302,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 			Tok:    token.TYPE,
 		}
 		for _, name := range builtinAliases {
-			typeSpec := p.getIntegerType("_Cgo_"+name, names["_Cgo_"+name])
+			typeSpec := p.getIntegerType("C."+name, names["_Cgo_"+name])
 			gen.Specs = append(gen.Specs, typeSpec)
 		}
 		p.generated.Decls = append(p.generated.Decls, gen)
@@ -387,11 +311,10 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// Process CGo imports for each file.
 	for i, f := range files {
 		cf := p.newCGoFile(f, i)
-		// These types are aliased with the corresponding types in C. For
-		// example, float in C is always float32 in Go.
+		// Float and double are aliased, meaning that C.float is the same thing
+		// as float32 in Go.
 		cf.names["float"] = clangCursor{}
 		cf.names["double"] = clangCursor{}
-		cf.names["_Bool"] = clangCursor{}
 		// Now read all the names (identifies) that C defines in the header
 		// snippet.
 		cf.readNames(p.cgoHeaders[i], cflagsForCGo, filepath.Base(fset.File(f.Pos()).Name()), func(names map[string]clangCursor) {
@@ -407,26 +330,10 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 		})
 	}
 
-	// Show an error when a #cgo noescape line isn't used in practice.
-	// This matches upstream Go. I think the goal is to avoid issues with
-	// misspelled function names, which seems very useful.
-	var unusedNoescapeLines []*noescapingFunc
-	for _, value := range p.noescapingFuncs {
-		if !value.used {
-			unusedNoescapeLines = append(unusedNoescapeLines, value)
-		}
-	}
-	sort.SliceStable(unusedNoescapeLines, func(i, j int) bool {
-		return unusedNoescapeLines[i].pos < unusedNoescapeLines[j].pos
-	})
-	for _, value := range unusedNoescapeLines {
-		p.addError(value.pos, fmt.Sprintf("function %#v in #cgo noescape line is not used", value.name))
-	}
-
 	// Print the newly generated in-memory AST, for debugging.
 	//ast.Print(fset, p.generated)
 
-	return p.cgoFiles, p.cgoHeaders, p.cflags, p.ldflags, p.visitedFiles, p.errors
+	return p.generated, p.cgoHeaders, p.cflags, p.ldflags, p.visitedFiles, p.errors
 }
 
 func (p *cgoPackage) newCGoFile(file *ast.File, index int) *cgoFile {
@@ -488,33 +395,6 @@ func (p *cgoPackage) parseCGoPreprocessorLines(text string, pos token.Pos) strin
 		}
 		text = text[:lineStart] + string(spaces) + text[lineEnd:]
 
-		allFields := strings.Fields(line[4:])
-		switch allFields[0] {
-		case "noescape":
-			// The code indicates that pointer parameters will not be captured
-			// by the called C function.
-			if len(allFields) < 2 {
-				p.addErrorAfter(pos, text[:lineStart], "missing function name in #cgo noescape line")
-				continue
-			}
-			if len(allFields) > 2 {
-				p.addErrorAfter(pos, text[:lineStart], "multiple function names in #cgo noescape line")
-				continue
-			}
-			name := allFields[1]
-			p.noescapingFuncs[name] = &noescapingFunc{
-				name: name,
-				pos:  pos,
-				used: false,
-			}
-			continue
-		case "nocallback":
-			// We don't do anything special when calling a C function, so there
-			// appears to be no optimization that we can do here.
-			// Accept, but ignore the parameter for compatibility.
-			continue
-		}
-
 		// Get the text before the colon in the #cgo directive.
 		colon := strings.IndexByte(line, ':')
 		if colon < 0 {
@@ -652,6 +532,7 @@ func (p *cgoPackage) createUnionAccessor(field *ast.Field, typeName string) {
 		X: &ast.Ident{
 			NamePos: pos,
 			Name:    "union",
+			Obj:     nil,
 		},
 		Sel: &ast.Ident{
 			NamePos: pos,
@@ -705,6 +586,7 @@ func (p *cgoPackage) createUnionAccessor(field *ast.Field, typeName string) {
 						X: &ast.Ident{
 							NamePos: pos,
 							Name:    typeName,
+							Obj:     nil,
 						},
 					},
 				},
@@ -760,6 +642,7 @@ func (p *cgoPackage) createBitfieldGetter(bitfield bitfieldInfo, typeName string
 		X: &ast.Ident{
 			NamePos: bitfield.pos,
 			Name:    "s",
+			Obj:     nil,
 		},
 		Sel: &ast.Ident{
 			NamePos: bitfield.pos,
@@ -806,6 +689,11 @@ func (p *cgoPackage) createBitfieldGetter(bitfield bitfieldInfo, typeName string
 						{
 							NamePos: bitfield.pos,
 							Name:    "s",
+							Obj: &ast.Object{
+								Kind: ast.Var,
+								Name: "s",
+								Decl: nil,
+							},
 						},
 					},
 					Type: &ast.StarExpr{
@@ -813,6 +701,7 @@ func (p *cgoPackage) createBitfieldGetter(bitfield bitfieldInfo, typeName string
 						X: &ast.Ident{
 							NamePos: bitfield.pos,
 							Name:    typeName,
+							Obj:     nil,
 						},
 					},
 				},
@@ -870,6 +759,7 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 		X: &ast.Ident{
 			NamePos: bitfield.pos,
 			Name:    "s",
+			Obj:     nil,
 		},
 		Sel: &ast.Ident{
 			NamePos: bitfield.pos,
@@ -952,6 +842,11 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 						{
 							NamePos: bitfield.pos,
 							Name:    "s",
+							Obj: &ast.Object{
+								Kind: ast.Var,
+								Name: "s",
+								Decl: nil,
+							},
 						},
 					},
 					Type: &ast.StarExpr{
@@ -959,6 +854,7 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 						X: &ast.Ident{
 							NamePos: bitfield.pos,
 							Name:    typeName,
+							Obj:     nil,
 						},
 					},
 				},
@@ -979,6 +875,7 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 							{
 								NamePos: bitfield.pos,
 								Name:    "value",
+								Obj:     nil,
 							},
 						},
 						Type: bitfield.field.Type,
@@ -996,6 +893,7 @@ func (p *cgoPackage) createBitfieldSetter(bitfield bitfieldInfo, typeName string
 							X: &ast.Ident{
 								NamePos: bitfield.pos,
 								Name:    "s",
+								Obj:     nil,
 							},
 							Sel: &ast.Ident{
 								NamePos: bitfield.pos,
@@ -1219,7 +1117,7 @@ func getPos(node ast.Node) token.Pos {
 // getUnnamedDeclName creates a name (with the given prefix) for the given C
 // declaration. This is used for structs, unions, and enums that are often
 // defined without a name and used in a typedef.
-func (p *cgoPackage) getUnnamedDeclName(prefix string, itf any) string {
+func (p *cgoPackage) getUnnamedDeclName(prefix string, itf interface{}) string {
 	if name, ok := p.anonDecls[itf]; ok {
 		return name
 	}
@@ -1233,22 +1131,22 @@ func (p *cgoPackage) getUnnamedDeclName(prefix string, itf any) string {
 func (f *cgoFile) getASTDeclName(name string, found clangCursor, iscall bool) string {
 	// Some types are defined in stdint.h and map directly to a particular Go
 	// type.
-	if alias := cgoAliases["_Cgo_"+name]; alias != "" {
+	if alias := cgoAliases["C."+name]; alias != "" {
 		return alias
 	}
-	node := f.getASTDeclNode(name, found)
+	node := f.getASTDeclNode(name, found, iscall)
 	if node, ok := node.(*ast.FuncDecl); ok {
 		if !iscall {
 			return node.Name.Name + "$funcaddr"
 		}
 		return node.Name.Name
 	}
-	return "_Cgo_" + name
+	return "C." + name
 }
 
 // getASTDeclNode will declare the given C AST node (if not already defined) and
 // returns it.
-func (f *cgoFile) getASTDeclNode(name string, found clangCursor) ast.Node {
+func (f *cgoFile) getASTDeclNode(name string, found clangCursor, iscall bool) ast.Node {
 	if node, ok := f.defined[name]; ok {
 		// Declaration was found in the current file, so return it immediately.
 		return node
@@ -1343,8 +1241,8 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 	case *elaboratedTypeInfo:
 		// Add struct bitfields.
 		for _, bitfield := range elaboratedType.bitfields {
-			f.createBitfieldGetter(bitfield, "_Cgo_"+name)
-			f.createBitfieldSetter(bitfield, "_Cgo_"+name)
+			f.createBitfieldGetter(bitfield, "C."+name)
+			f.createBitfieldSetter(bitfield, "C."+name)
 		}
 		if elaboratedType.unionSize != 0 {
 			// Create union getters/setters.
@@ -1353,7 +1251,7 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 					f.addError(elaboratedType.pos, fmt.Sprintf("union must have field with a single name, it has %d names", len(field.Names)))
 					continue
 				}
-				f.createUnionAccessor(field, "_Cgo_"+name)
+				f.createUnionAccessor(field, "C."+name)
 			}
 		}
 	}
@@ -1367,45 +1265,6 @@ extern __typeof(%s) %s __attribute__((alias(%#v)));
 // separate namespace (no _Cgo_ hacks like in gc).
 func (f *cgoFile) walker(cursor *astutil.Cursor, names map[string]clangCursor) bool {
 	switch node := cursor.Node().(type) {
-	case *ast.AssignStmt:
-		// An assign statement could be something like this:
-		//
-		//   val, errno := C.some_func()
-		//
-		// Check whether it looks like that, and if so, read the errno value and
-		// return it as the second return value. The call will be transformed
-		// into something like this:
-		//
-		//   val, errno := C.some_func(), C.__get_errno()
-		if len(node.Lhs) != 2 || len(node.Rhs) != 1 {
-			return true
-		}
-		rhs, ok := node.Rhs[0].(*ast.CallExpr)
-		if !ok {
-			return true
-		}
-		fun, ok := rhs.Fun.(*ast.SelectorExpr)
-		if !ok {
-			return true
-		}
-		x, ok := fun.X.(*ast.Ident)
-		if !ok {
-			return true
-		}
-		if found, ok := names[fun.Sel.Name]; ok && x.Name == "C" {
-			// Replace "C"."some_func" into "C.somefunc".
-			rhs.Fun = &ast.Ident{
-				NamePos: x.NamePos,
-				Name:    f.getASTDeclName(fun.Sel.Name, found, true),
-			}
-			// Add the errno value as the second value in the statement.
-			node.Rhs = append(node.Rhs, &ast.CallExpr{
-				Fun: &ast.Ident{
-					NamePos: node.Lhs[1].End(),
-					Name:    "_Cgo___get_errno",
-				},
-			})
-		}
 	case *ast.CallExpr:
 		fun, ok := node.Fun.(*ast.SelectorExpr)
 		if !ok {
@@ -1427,7 +1286,7 @@ func (f *cgoFile) walker(cursor *astutil.Cursor, names map[string]clangCursor) b
 			return true
 		}
 		if x.Name == "C" {
-			name := "_Cgo_" + node.Sel.Name
+			name := "C." + node.Sel.Name
 			if found, ok := names[node.Sel.Name]; ok {
 				name = f.getASTDeclName(node.Sel.Name, found, false)
 			}

cgo/cgo_test.go

@@ -7,7 +7,6 @@ import (
 	"go/ast"
 	"go/format"
 	"go/parser"
-	"go/scanner"
 	"go/token"
 	"go/types"
 	"os"
@@ -45,6 +44,7 @@ func TestCGo(t *testing.T) {
 		"flags",
 		"const",
 	} {
+		name := name // avoid a race condition
 		t.Run(name, func(t *testing.T) {
 			// Read the AST in memory.
 			path := filepath.Join("testdata", name+".go")
@@ -55,7 +55,7 @@ func TestCGo(t *testing.T) {
 			}
 
 			// Process the AST with CGo.
-			cgoFiles, _, _, _, _, cgoErrors := Process([]*ast.File{f}, "testdata", "main", fset, cflags, "linux")
+			cgoAST, _, _, _, _, cgoErrors := Process([]*ast.File{f}, "testdata", "main", fset, cflags, "")
 
 			// Check the AST for type errors.
 			var typecheckErrors []error
@@ -63,10 +63,10 @@ func TestCGo(t *testing.T) {
 				Error: func(err error) {
 					typecheckErrors = append(typecheckErrors, err)
 				},
-				Importer: newSimpleImporter(),
+				Importer: simpleImporter{},
 				Sizes:    types.SizesFor("gccgo", "arm"),
 			}
-			_, err = config.Check("", fset, append([]*ast.File{f}, cgoFiles...), nil)
+			_, err = config.Check("", fset, []*ast.File{f, cgoAST}, nil)
 			if err != nil && len(typecheckErrors) == 0 {
 				// Only report errors when no type errors are found (an
 				// unexpected condition).
@@ -91,7 +91,7 @@ func TestCGo(t *testing.T) {
 				}
 				buf.WriteString("\n")
 			}
-			err = format.Node(buf, fset, cgoFiles[0])
+			err = format.Node(buf, fset, cgoAST)
 			if err != nil {
 				t.Errorf("could not write out CGo AST: %v", err)
 			}
@@ -201,33 +201,14 @@ func Test_cgoPackage_isEquivalentAST(t *testing.T) {
 }
 
 // simpleImporter implements the types.Importer interface, but only allows
-// importing the syscall and unsafe packages.
+// importing the unsafe package.
 type simpleImporter struct {
-	syscallPkg *types.Package
-}
-
-func newSimpleImporter() *simpleImporter {
-	i := &simpleImporter{}
-
-	// Implement a dummy syscall package with the Errno type.
-	i.syscallPkg = types.NewPackage("syscall", "syscall")
-	obj := types.NewTypeName(token.NoPos, i.syscallPkg, "Errno", nil)
-	named := types.NewNamed(obj, nil, nil)
-	i.syscallPkg.Scope().Insert(obj)
-	named.SetUnderlying(types.Typ[types.Uintptr])
-	sig := types.NewSignatureType(nil, nil, nil, types.NewTuple(), types.NewTuple(types.NewParam(token.NoPos, i.syscallPkg, "", types.Typ[types.String])), false)
-	named.AddMethod(types.NewFunc(token.NoPos, i.syscallPkg, "Error", sig))
-	i.syscallPkg.MarkComplete()
-
-	return i
 }
 
 // Import implements the Importer interface. For testing usage only: it only
 // supports importing the unsafe package.
-func (i *simpleImporter) Import(path string) (*types.Package, error) {
+func (i simpleImporter) Import(path string) (*types.Package, error) {
 	switch path {
-	case "syscall":
-		return i.syscallPkg, nil
 	case "unsafe":
 		return types.Unsafe, nil
 	default:
@@ -235,16 +216,10 @@ func (i *simpleImporter) Import(path string) (*types.Package, error) {
 	}
 }
 
-// formatDiagnostic formats the error message to be an indented comment. It
+// formatDiagnostics formats the error message to be an indented comment. It
 // also fixes Windows path name issues (backward slashes).
 func formatDiagnostic(err error) string {
-	var msg string
-	switch err := err.(type) {
-	case scanner.Error:
-		msg = err.Pos.String() + ": " + err.Msg
-	default:
-		msg = err.Error()
-	}
+	msg := err.Error()
 	if runtime.GOOS == "windows" {
 		// Fix Windows path slashes.
 		msg = strings.ReplaceAll(msg, "testdata\\", "testdata/")

cgo/const.go

@@ -17,8 +17,6 @@ var (
 		token.OR:  precedenceOr,
 		token.XOR: precedenceXor,
 		token.AND: precedenceAnd,
-		token.SHL: precedenceShift,
-		token.SHR: precedenceShift,
 		token.ADD: precedenceAdd,
 		token.SUB: precedenceAdd,
 		token.MUL: precedenceMul,
@@ -27,13 +25,11 @@ var (
 	}
 )
 
-// See: https://en.cppreference.com/w/c/language/operator_precedence
 const (
 	precedenceLowest = iota + 1
 	precedenceOr
 	precedenceXor
 	precedenceAnd
-	precedenceShift
 	precedenceAdd
 	precedenceMul
 	precedencePrefix
@@ -54,72 +50,8 @@ func init() {
 }
 
 // parseConst parses the given string as a C constant.
-func parseConst(pos token.Pos, fset *token.FileSet, value string, params []ast.Expr, callerPos token.Pos, f *cgoFile) (ast.Expr, *scanner.Error) {
-	t := newTokenizer(pos, fset, value, f)
-
-	// If params is non-nil (could be a zero length slice), this const is
-	// actually a function-call like expression from another macro.
-	// This means we have to parse a string like "(a, b) (a+b)".
-	// We do this by parsing the parameters at the start and then treating the
-	// following like a normal constant expression.
-	if params != nil {
-		// Parse opening paren.
-		if t.curToken != token.LPAREN {
-			return nil, unexpectedToken(t, token.LPAREN)
-		}
-		t.Next()
-
-		// Parse parameters (identifiers) and closing paren.
-		var paramIdents []string
-		for i := 0; ; i++ {
-			if i == 0 && t.curToken == token.RPAREN {
-				// No parameters, break early.
-				t.Next()
-				break
-			}
-
-			// Read the parameter name.
-			if t.curToken != token.IDENT {
-				return nil, unexpectedToken(t, token.IDENT)
-			}
-			paramIdents = append(paramIdents, t.curValue)
-			t.Next()
-
-			// Read the next token: either a continuation (comma) or end of list
-			// (rparen).
-			if t.curToken == token.RPAREN {
-				// End of parameter list.
-				t.Next()
-				break
-			} else if t.curToken == token.COMMA {
-				// Comma, so there will be another parameter name.
-				t.Next()
-			} else {
-				return nil, &scanner.Error{
-					Pos: t.fset.Position(t.curPos),
-					Msg: "unexpected token " + t.curToken.String() + " inside macro parameters, expected ',' or ')'",
-				}
-			}
-		}
-
-		// Report an error if there is a mismatch in parameter length.
-		// The error is reported at the location of the closing paren from the
-		// caller location.
-		if len(params) != len(paramIdents) {
-			return nil, &scanner.Error{
-				Pos: t.fset.Position(callerPos),
-				Msg: fmt.Sprintf("unexpected number of parameters: expected %d, got %d", len(paramIdents), len(params)),
-			}
-		}
-
-		// Assign values to the parameters.
-		// These parameter names are closer in 'scope' than other identifiers so
-		// will be used first when parsing an identifier.
-		for i, name := range paramIdents {
-			t.params[name] = params[i]
-		}
-	}
-
+func parseConst(pos token.Pos, fset *token.FileSet, value string) (ast.Expr, *scanner.Error) {
+	t := newTokenizer(pos, fset, value)
 	expr, err := parseConstExpr(t, precedenceLowest)
 	t.Next()
 	if t.curToken != token.EOF {
@@ -150,7 +82,7 @@ func parseConstExpr(t *tokenizer, precedence int) (ast.Expr, *scanner.Error) {
 
 	for t.peekToken != token.EOF && precedence < precedences[t.peekToken] {
 		switch t.peekToken {
-		case token.OR, token.XOR, token.AND, token.SHL, token.SHR, token.ADD, token.SUB, token.MUL, token.QUO, token.REM:
+		case token.OR, token.XOR, token.AND, token.ADD, token.SUB, token.MUL, token.QUO, token.REM:
 			t.Next()
 			leftExpr, err = parseBinaryExpr(t, leftExpr)
 		}
@@ -160,68 +92,6 @@ func parseConstExpr(t *tokenizer, precedence int) (ast.Expr, *scanner.Error) {
 }
 
 func parseIdent(t *tokenizer) (ast.Expr, *scanner.Error) {
-	// If the identifier is one of the parameters of this function-like macro,
-	// use the parameter value.
-	if val, ok := t.params[t.curValue]; ok {
-		return val, nil
-	}
-
-	if t.f != nil {
-		// Check whether this identifier is actually a macro "call" with
-		// parameters. In that case, we should parse the parameters and pass it
-		// on to a new invocation of parseConst.
-		if t.peekToken == token.LPAREN {
-			if cursor, ok := t.f.names[t.curValue]; ok && t.f.isFunctionLikeMacro(cursor) {
-				// We know the current and peek tokens (the peek one is the '('
-				// token). So skip ahead until the current token is the first
-				// unknown token.
-				t.Next()
-				t.Next()
-
-				// Parse the list of parameters until ')' (rparen) is found.
-				params := []ast.Expr{}
-				for i := 0; ; i++ {
-					if i == 0 && t.curToken == token.RPAREN {
-						break
-					}
-					x, err := parseConstExpr(t, precedenceLowest)
-					if err != nil {
-						return nil, err
-					}
-					params = append(params, x)
-					t.Next()
-					if t.curToken == token.COMMA {
-						t.Next()
-					} else if t.curToken == token.RPAREN {
-						break
-					} else {
-						return nil, &scanner.Error{
-							Pos: t.fset.Position(t.curPos),
-							Msg: "unexpected token " + t.curToken.String() + ", ',' or ')'",
-						}
-					}
-				}
-
-				// Evaluate the macro value and use it as the identifier value.
-				rparen := t.curPos
-				pos, text := t.f.getMacro(cursor)
-				return parseConst(pos, t.fset, text, params, rparen, t.f)
-			}
-		}
-
-		// Normally the name is something defined in the file (like another
-		// macro) which we get the declaration from using getASTDeclName.
-		// This ensures that names that are only referenced inside a macro are
-		// still getting defined.
-		if cursor, ok := t.f.names[t.curValue]; ok {
-			return &ast.Ident{
-				NamePos: t.curPos,
-				Name:    t.f.getASTDeclName(t.curValue, cursor, false),
-			}, nil
-		}
-	}
-
-	// t.f is nil during testing. This is a fallback.
 	return &ast.Ident{
 		NamePos: t.curPos,
 		Name:    "C." + t.curValue,
@@ -290,25 +160,21 @@ func unexpectedToken(t *tokenizer, expected token.Token) *scanner.Error {
 
 // tokenizer reads C source code and converts it to Go tokens.
 type tokenizer struct {
-	f                   *cgoFile
 	curPos, peekPos     token.Pos
 	fset                *token.FileSet
 	curToken, peekToken token.Token
 	curValue, peekValue string
 	buf                 string
-	params              map[string]ast.Expr
 }
 
 // newTokenizer initializes a new tokenizer, positioned at the first token in
 // the string.
-func newTokenizer(start token.Pos, fset *token.FileSet, buf string, f *cgoFile) *tokenizer {
+func newTokenizer(start token.Pos, fset *token.FileSet, buf string) *tokenizer {
 	t := &tokenizer{
-		f:         f,
 		peekPos:   start,
 		fset:      fset,
 		buf:       buf,
 		peekToken: token.ILLEGAL,
-		params:    make(map[string]ast.Expr),
 	}
 	// Parse the first two tokens (cur and peek).
 	t.Next()
@@ -325,9 +191,7 @@ func (t *tokenizer) Next() {
 	t.curValue = t.peekValue
 
 	// Parse the next peek token.
-	if t.peekPos != token.NoPos {
-		t.peekPos += token.Pos(len(t.curValue))
-	}
+	t.peekPos += token.Pos(len(t.curValue))
 	for {
 		if len(t.buf) == 0 {
 			t.peekToken = token.EOF
@@ -339,28 +203,20 @@ func (t *tokenizer) Next() {
 			// Skip whitespace.
 			// Based on this source, not sure whether it represents C whitespace:
 			// https://en.cppreference.com/w/cpp/string/byte/isspace
-			if t.peekPos != token.NoPos {
-				t.peekPos++
-			}
+			t.peekPos++
 			t.buf = t.buf[1:]
-		case len(t.buf) >= 2 && (string(t.buf[:2]) == "||" || string(t.buf[:2]) == "&&" || string(t.buf[:2]) == "<<" || string(t.buf[:2]) == ">>"):
+		case len(t.buf) >= 2 && (string(t.buf[:2]) == "||" || string(t.buf[:2]) == "&&"):
 			// Two-character tokens.
 			switch c {
 			case '&':
 				t.peekToken = token.LAND
 			case '|':
 				t.peekToken = token.LOR
-			case '<':
-				t.peekToken = token.SHL
-			case '>':
-				t.peekToken = token.SHR
-			default:
-				panic("unreachable")
 			}
 			t.peekValue = t.buf[:2]
 			t.buf = t.buf[2:]
 			return
-		case c == '(' || c == ')' || c == ',' || c == '+' || c == '-' || c == '*' || c == '/' || c == '%' || c == '&' || c == '|' || c == '^':
+		case c == '(' || c == ')' || c == '+' || c == '-' || c == '*' || c == '/' || c == '%' || c == '&' || c == '|' || c == '^':
 			// Single-character tokens.
 			// TODO: ++ (increment) and -- (decrement) operators.
 			switch c {
@@ -368,8 +224,6 @@ func (t *tokenizer) Next() {
 				t.peekToken = token.LPAREN
 			case ')':
 				t.peekToken = token.RPAREN
-			case ',':
-				t.peekToken = token.COMMA
 			case '+':
 				t.peekToken = token.ADD
 			case '-':

cgo/const_test.go

@@ -40,10 +40,6 @@ func TestParseConst(t *testing.T) {
 		{`5&5`, `5 & 5`},
 		{`5|5`, `5 | 5`},
 		{`5^5`, `5 ^ 5`},
-		{`5<<5`, `5 << 5`},
-		{`5>>5`, `5 >> 5`},
-		{`5>>5 + 3`, `5 >> (5 + 3)`},
-		{`5>>5 ^ 3`, `5>>5 ^ 3`},
 		{`5||5`, `error: 1:2: unexpected token ||, expected end of expression`}, // logical binops aren't supported yet
 		{`(5/5)`, `(5 / 5)`},
 		{`1 - 2`, `1 - 2`},
@@ -59,7 +55,7 @@ func TestParseConst(t *testing.T) {
 	} {
 		fset := token.NewFileSet()
 		startPos := fset.AddFile("", -1, 1000).Pos(0)
-		expr, err := parseConst(startPos, fset, tc.C, nil, token.NoPos, nil)
+		expr, err := parseConst(startPos, fset, tc.C)
 		s := "<invalid>"
 		if err != nil {
 			if !strings.HasPrefix(tc.Go, "error: ") {

cgo/libclang.go

@@ -4,7 +4,6 @@ package cgo
 // modification. It does not touch the AST itself.
 
 import (
-	"bytes"
 	"crypto/sha256"
 	"crypto/sha512"
 	"encoding/hex"
@@ -61,26 +60,11 @@ CXSourceRange tinygo_clang_getCursorExtent(GoCXCursor c);
 CXTranslationUnit tinygo_clang_Cursor_getTranslationUnit(GoCXCursor c);
 long long tinygo_clang_getEnumConstantDeclValue(GoCXCursor c);
 CXType tinygo_clang_getEnumDeclIntegerType(GoCXCursor c);
-unsigned tinygo_clang_Cursor_isAnonymous(GoCXCursor c);
 unsigned tinygo_clang_Cursor_isBitField(GoCXCursor c);
-unsigned tinygo_clang_Cursor_isMacroFunctionLike(GoCXCursor c);
 
-// Fix some warnings on Windows ARM. Without the __declspec(dllexport), it gives warnings like this:
-//     In file included from _cgo_export.c:4:
-//     cgo-gcc-export-header-prolog:49:34: warning: redeclaration of 'tinygo_clang_globals_visitor' should not add 'dllexport' attribute [-Wdll-attribute-on-redeclaration]
-//     libclang.go:68:5: note: previous declaration is here
-// See: https://github.com/golang/go/issues/49721
-#if defined(_WIN32)
-#define CGO_DECL __declspec(dllexport)
-#else
-#define CGO_DECL
-#endif
-
-CGO_DECL
 int tinygo_clang_globals_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
-CGO_DECL
 int tinygo_clang_struct_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
-CGO_DECL
+int tinygo_clang_enum_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
 void tinygo_clang_inclusion_visitor(CXFile included_file, CXSourceLocation *inclusion_stack, unsigned include_len, CXClientData client_data);
 */
 import "C"
@@ -130,7 +114,7 @@ func (f *cgoFile) readNames(fragment string, cflags []string, filename string, c
 	// convert Go slice of strings to C array of strings.
 	cmdargsC := C.malloc(C.size_t(len(cflags)) * C.size_t(unsafe.Sizeof(uintptr(0))))
 	defer C.free(cmdargsC)
-	cmdargs := unsafe.Slice((**C.char)(cmdargsC), len(cflags))
+	cmdargs := (*[1 << 16]*C.char)(cmdargsC)
 	for i, cflag := range cflags {
 		s := C.CString(cflag)
 		cmdargs[i] = s
@@ -160,7 +144,7 @@ func (f *cgoFile) readNames(fragment string, cflags []string, filename string, c
 			pos := f.getClangLocationPosition(location, unit)
 			f.addError(pos, severity+": "+spelling)
 		}
-		for i := range numDiagnostics {
+		for i := 0; i < numDiagnostics; i++ {
 			diagnostic := C.clang_getDiagnostic(unit, C.uint(i))
 			addDiagnostic(diagnostic)
 
@@ -190,7 +174,7 @@ func (f *cgoFile) readNames(fragment string, cflags []string, filename string, c
 			// Sanity check. This should (hopefully) never trigger.
 			panic("libclang: file contents was not loaded")
 		}
-		data := unsafe.Slice((*byte)(unsafe.Pointer(rawData)), size)
+		data := (*[1 << 24]byte)(unsafe.Pointer(rawData))[:size]
 
 		// Hash the contents if it isn't hashed yet.
 		if _, ok := f.visitedFiles[path]; !ok {
@@ -217,6 +201,10 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 	case C.CXCursor_FunctionDecl:
 		cursorType := C.tinygo_clang_getCursorType(c)
 		numArgs := int(C.tinygo_clang_Cursor_getNumArguments(c))
+		obj := &ast.Object{
+			Kind: ast.Fun,
+			Name: "C." + name,
+		}
 		exportName := name
 		localName := name
 		var stringSignature string
@@ -253,7 +241,8 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			},
 			Name: &ast.Ident{
 				NamePos: pos,
-				Name:    "_Cgo_" + localName,
+				Name:    "C." + localName,
+				Obj:     obj,
 			},
 			Type: &ast.FuncType{
 				Func: pos,
@@ -264,21 +253,13 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				},
 			},
 		}
-		var doc []string
 		if C.clang_isFunctionTypeVariadic(cursorType) != 0 {
-			doc = append(doc, "//go:variadic")
-		}
-		if _, ok := f.noescapingFuncs[name]; ok {
-			doc = append(doc, "//go:noescape")
-			f.noescapingFuncs[name].used = true
-		}
-		if len(doc) != 0 {
 			decl.Doc.List = append(decl.Doc.List, &ast.Comment{
 				Slash: pos - 1,
-				Text:  strings.Join(doc, "\n"),
+				Text:  "//go:variadic",
 			})
 		}
-		for i := range numArgs {
+		for i := 0; i < numArgs; i++ {
 			arg := C.tinygo_clang_Cursor_getArgument(c, C.uint(i))
 			argName := getString(C.tinygo_clang_getCursorSpelling(arg))
 			argType := C.clang_getArgType(cursorType, C.uint(i))
@@ -290,6 +271,11 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 					{
 						NamePos: pos,
 						Name:    argName,
+						Obj: &ast.Object{
+							Kind: ast.Var,
+							Name: argName,
+							Decl: decl,
+						},
 					},
 				},
 				Type: f.makeDecayingASTType(argType, pos),
@@ -305,34 +291,49 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				},
 			}
 		}
+		obj.Decl = decl
 		return decl, stringSignature
 	case C.CXCursor_StructDecl, C.CXCursor_UnionDecl:
 		typ := f.makeASTRecordType(c, pos)
-		typeName := "_Cgo_" + name
+		typeName := "C." + name
 		typeExpr := typ.typeExpr
 		if typ.unionSize != 0 {
 			// Convert to a single-field struct type.
 			typeExpr = f.makeUnionField(typ)
 		}
+		obj := &ast.Object{
+			Kind: ast.Typ,
+			Name: typeName,
+		}
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: typ.pos,
 				Name:    typeName,
+				Obj:     obj,
 			},
 			Type: typeExpr,
 		}
+		obj.Decl = typeSpec
 		return typeSpec, typ
 	case C.CXCursor_TypedefDecl:
-		typeName := "_Cgo_" + name
+		typeName := "C." + name
 		underlyingType := C.tinygo_clang_getTypedefDeclUnderlyingType(c)
+		obj := &ast.Object{
+			Kind: ast.Typ,
+			Name: typeName,
+		}
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: pos,
 				Name:    typeName,
+				Obj:     obj,
 			},
-			Assign: pos,
-			Type:   f.makeASTType(underlyingType, pos),
+			Type: f.makeASTType(underlyingType, pos),
 		}
+		if underlyingType.kind != C.CXType_Enum {
+			typeSpec.Assign = pos
+		}
+		obj.Decl = typeSpec
 		return typeSpec, nil
 	case C.CXCursor_VarDecl:
 		cursorType := C.tinygo_clang_getCursorType(c)
@@ -351,18 +352,58 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 				},
 			},
 		}
+		obj := &ast.Object{
+			Kind: ast.Var,
+			Name: "C." + name,
+		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
+				Obj:     obj,
 			}},
 			Type: typeExpr,
 		}
+		obj.Decl = valueSpec
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	case C.CXCursor_MacroDefinition:
-		tokenPos, value := f.getMacro(c)
-		expr, scannerError := parseConst(tokenPos, f.fset, value, nil, token.NoPos, f)
+		sourceRange := C.tinygo_clang_getCursorExtent(c)
+		start := C.clang_getRangeStart(sourceRange)
+		end := C.clang_getRangeEnd(sourceRange)
+		var file, endFile C.CXFile
+		var startOffset, endOffset C.unsigned
+		C.clang_getExpansionLocation(start, &file, nil, nil, &startOffset)
+		if file == nil {
+			f.addError(pos, "internal error: could not find file where macro is defined")
+			return nil, nil
+		}
+		C.clang_getExpansionLocation(end, &endFile, nil, nil, &endOffset)
+		if file != endFile {
+			f.addError(pos, "internal error: expected start and end location of a macro to be in the same file")
+			return nil, nil
+		}
+		if startOffset > endOffset {
+			f.addError(pos, "internal error: start offset of macro is after end offset")
+			return nil, nil
+		}
+
+		// read file contents and extract the relevant byte range
+		tu := C.tinygo_clang_Cursor_getTranslationUnit(c)
+		var size C.size_t
+		sourcePtr := C.clang_getFileContents(tu, file, &size)
+		if endOffset >= C.uint(size) {
+			f.addError(pos, "internal error: end offset of macro lies after end of file")
+			return nil, nil
+		}
+		source := string(((*[1 << 28]byte)(unsafe.Pointer(sourcePtr)))[startOffset:endOffset:endOffset])
+		if !strings.HasPrefix(source, name) {
+			f.addError(pos, fmt.Sprintf("internal error: expected macro value to start with %#v, got %#v", name, source))
+			return nil, nil
+		}
+		value := source[len(name):]
+		// Try to convert this #define into a Go constant expression.
+		expr, scannerError := parseConst(pos+token.Pos(len(name)), f.fset, value)
 		if scannerError != nil {
 			f.errors = append(f.errors, *scannerError)
 			return nil, nil
@@ -374,27 +415,39 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			Lparen: token.NoPos,
 			Rparen: token.NoPos,
 		}
+		obj := &ast.Object{
+			Kind: ast.Con,
+			Name: "C." + name,
+		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
+				Obj:     obj,
 			}},
 			Values: []ast.Expr{expr},
 		}
+		obj.Decl = valueSpec
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	case C.CXCursor_EnumDecl:
+		obj := &ast.Object{
+			Kind: ast.Typ,
+			Name: "C." + name,
+		}
 		underlying := C.tinygo_clang_getEnumDeclIntegerType(c)
 		// TODO: gc's CGo implementation uses types such as `uint32` for enums
 		// instead of types such as C.int, which are used here.
 		typeSpec := &ast.TypeSpec{
 			Name: &ast.Ident{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
+				Obj:     obj,
 			},
 			Assign: pos,
 			Type:   f.makeASTType(underlying, pos),
 		}
+		obj.Decl = typeSpec
 		return typeSpec, nil
 	case C.CXCursor_EnumConstantDecl:
 		value := C.tinygo_clang_getEnumConstantDeclValue(c)
@@ -409,13 +462,19 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 			Lparen: token.NoPos,
 			Rparen: token.NoPos,
 		}
+		obj := &ast.Object{
+			Kind: ast.Con,
+			Name: "C." + name,
+		}
 		valueSpec := &ast.ValueSpec{
 			Names: []*ast.Ident{{
 				NamePos: pos,
-				Name:    "_Cgo_" + name,
+				Name:    "C." + name,
+				Obj:     obj,
 			}},
 			Values: []ast.Expr{expr},
 		}
+		obj.Decl = valueSpec
 		gen.Specs = append(gen.Specs, valueSpec)
 		return gen, nil
 	default:
@@ -424,62 +483,6 @@ func (f *cgoFile) createASTNode(name string, c clangCursor) (ast.Node, any) {
 	}
 }
 
-// Return whether this is a macro that's also function-like, like this:
-//
-//	#define add(a, b) (a+b)
-func (f *cgoFile) isFunctionLikeMacro(c clangCursor) bool {
-	if C.tinygo_clang_getCursorKind(c) != C.CXCursor_MacroDefinition {
-		return false
-	}
-	return C.tinygo_clang_Cursor_isMacroFunctionLike(c) != 0
-}
-
-// Get the macro value: the position in the source file and the string value of
-// the macro.
-func (f *cgoFile) getMacro(c clangCursor) (pos token.Pos, value string) {
-	// Extract tokens from the Clang tokenizer.
-	// See: https://stackoverflow.com/a/19074846/559350
-	sourceRange := C.tinygo_clang_getCursorExtent(c)
-	tu := C.tinygo_clang_Cursor_getTranslationUnit(c)
-	var rawTokens *C.CXToken
-	var numTokens C.unsigned
-	C.clang_tokenize(tu, sourceRange, &rawTokens, &numTokens)
-	tokens := unsafe.Slice(rawTokens, numTokens)
-	defer C.clang_disposeTokens(tu, rawTokens, numTokens)
-
-	// Convert this range of tokens back to source text.
-	// Ugly, but it works well enough.
-	sourceBuf := &bytes.Buffer{}
-	var startOffset int
-	for i, token := range tokens {
-		spelling := getString(C.clang_getTokenSpelling(tu, token))
-		location := C.clang_getTokenLocation(tu, token)
-		var tokenOffset C.unsigned
-		C.clang_getExpansionLocation(location, nil, nil, nil, &tokenOffset)
-		if i == 0 {
-			// The first token is the macro name itself.
-			// Skip it (after using its location).
-			startOffset = int(tokenOffset)
-		} else {
-			// Later tokens are the macro contents.
-			for int(tokenOffset) > (startOffset + sourceBuf.Len()) {
-				// Pad the source text with whitespace (that must have been
-				// present in the original source as well).
-				sourceBuf.WriteByte(' ')
-			}
-			sourceBuf.WriteString(spelling)
-		}
-	}
-	value = sourceBuf.String()
-
-	// Obtain the position of this token. This is the position of the first
-	// character in the 'value' string and is used to report errors at the
-	// correct location in the source file.
-	pos = f.getCursorPosition(c)
-
-	return
-}
-
 func getString(clangString C.CXString) (s string) {
 	rawString := C.clang_getCString(clangString)
 	s = C.GoString(rawString)
@@ -532,7 +535,7 @@ func tinygo_clang_globals_visitor(c, parent C.GoCXCursor, client_data C.CXClient
 
 // Get the precise location in the source code. Used for uniquely identifying
 // source locations.
-func (f *cgoFile) getUniqueLocationID(pos token.Pos, cursor C.GoCXCursor) any {
+func (f *cgoFile) getUniqueLocationID(pos token.Pos, cursor C.GoCXCursor) interface{} {
 	clangLocation := C.tinygo_clang_getCursorLocation(cursor)
 	var file C.CXFile
 	var line C.unsigned
@@ -575,7 +578,7 @@ func (p *cgoPackage) getClangLocationPosition(location C.CXSourceLocation, tu C.
 		// now by reading the file from libclang.
 		var size C.size_t
 		sourcePtr := C.clang_getFileContents(tu, file, &size)
-		source := unsafe.Slice((*byte)(unsafe.Pointer(sourcePtr)), size)
+		source := ((*[1 << 28]byte)(unsafe.Pointer(sourcePtr)))[:size:size]
 		lines := []int{0}
 		for i := 0; i < len(source)-1; i++ {
 			if source[i] == '\n' {
@@ -585,14 +588,6 @@ func (p *cgoPackage) getClangLocationPosition(location C.CXSourceLocation, tu C.
 		f := p.fset.AddFile(filename, -1, int(size))
 		f.SetLines(lines)
 		p.tokenFiles[filename] = f
-		// Add dummy file AST, to satisfy the type checker.
-		astFile := &ast.File{
-			Package: f.Pos(0),
-			Name:    ast.NewIdent(p.packageName),
-		}
-		astFile.FileStart = f.Pos(0)
-		astFile.FileEnd = f.Pos(int(size))
-		p.cgoFiles = append(p.cgoFiles, astFile)
 	}
 	positionFile := p.tokenFiles[filename]
 
@@ -639,6 +634,13 @@ func (p *cgoPackage) addErrorAfter(pos token.Pos, after, msg string) {
 
 // addErrorAt is a utility function to add an error to the list of errors.
 func (p *cgoPackage) addErrorAt(position token.Position, msg string) {
+	if filepath.IsAbs(position.Filename) {
+		// Relative paths for readability, like other Go parser errors.
+		relpath, err := filepath.Rel(p.currentDir, position.Filename)
+		if err == nil {
+			position.Filename = relpath
+		}
+	}
 	p.errors = append(p.errors, scanner.Error{
 		Pos: position,
 		Msg: msg,
@@ -651,19 +653,8 @@ func (p *cgoPackage) addErrorAt(position token.Position, msg string) {
 func (f *cgoFile) makeDecayingASTType(typ C.CXType, pos token.Pos) ast.Expr {
 	// Strip typedefs, if any.
 	underlyingType := typ
-	if underlyingType.kind == C.CXType_Elaborated {
-		// Starting with LLVM 16, the elaborated type is used for more types.
-		// According to the Clang documentation, the elaborated type has no
-		// semantic meaning so can be stripped (it is used to better convey type
-		// name information).
-		// Source:
-		// https://clang.llvm.org/doxygen/classclang_1_1ElaboratedType.html#details
-		// > The type itself is always "sugar", used to express what was written
-		// > in the source code but containing no additional semantic information.
-		underlyingType = C.clang_Type_getNamedType(underlyingType)
-	}
 	if underlyingType.kind == C.CXType_Typedef {
-		c := C.tinygo_clang_getTypeDeclaration(underlyingType)
+		c := C.tinygo_clang_getTypeDeclaration(typ)
 		underlyingType = C.tinygo_clang_getTypedefDeclUnderlyingType(c)
 		// TODO: support a chain of typedefs. At the moment, it seems to get
 		// stuck in an endless loop when trying to get to the most underlying
@@ -697,27 +688,27 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 	var typeName string
 	switch typ.kind {
 	case C.CXType_Char_S, C.CXType_Char_U:
-		typeName = "_Cgo_char"
+		typeName = "C.char"
 	case C.CXType_SChar:
-		typeName = "_Cgo_schar"
+		typeName = "C.schar"
 	case C.CXType_UChar:
-		typeName = "_Cgo_uchar"
+		typeName = "C.uchar"
 	case C.CXType_Short:
-		typeName = "_Cgo_short"
+		typeName = "C.short"
 	case C.CXType_UShort:
-		typeName = "_Cgo_ushort"
+		typeName = "C.ushort"
 	case C.CXType_Int:
-		typeName = "_Cgo_int"
+		typeName = "C.int"
 	case C.CXType_UInt:
-		typeName = "_Cgo_uint"
+		typeName = "C.uint"
 	case C.CXType_Long:
-		typeName = "_Cgo_long"
+		typeName = "C.long"
 	case C.CXType_ULong:
-		typeName = "_Cgo_ulong"
+		typeName = "C.ulong"
 	case C.CXType_LongLong:
-		typeName = "_Cgo_longlong"
+		typeName = "C.longlong"
 	case C.CXType_ULongLong:
-		typeName = "_Cgo_ulonglong"
+		typeName = "C.ulonglong"
 	case C.CXType_Bool:
 		typeName = "bool"
 	case C.CXType_Float, C.CXType_Double, C.CXType_LongDouble:
@@ -797,21 +788,11 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 			return f.makeASTType(underlying, pos)
 		case C.CXType_Enum:
 			return f.makeASTType(underlying, pos)
-		case C.CXType_Typedef:
-			return f.makeASTType(underlying, pos)
 		default:
 			typeKindSpelling := getString(C.clang_getTypeKindSpelling(underlying.kind))
 			f.addError(pos, fmt.Sprintf("unknown elaborated type (libclang type kind %s)", typeKindSpelling))
 			typeName = "<unknown>"
 		}
-	case C.CXType_Unexposed:
-		// LLVM 22+ may report certain builtin type aliases (e.g. __size_t)
-		// as Unexposed. Resolve via the canonical type.
-		canonical := C.clang_getCanonicalType(typ)
-		if canonical.kind != C.CXType_Unexposed && canonical.kind != C.CXType_Invalid {
-			return f.makeASTType(canonical, pos)
-		}
-		// If still unexposed, fall through to the error below.
 	case C.CXType_Record:
 		cursor := C.tinygo_clang_getTypeDeclaration(typ)
 		name := getString(C.tinygo_clang_getCursorSpelling(cursor))
@@ -825,7 +806,7 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 			// makeASTRecordType will create an appropriate error.
 			cgoRecordPrefix = "record_"
 		}
-		if name == "" || C.tinygo_clang_Cursor_isAnonymous(cursor) != 0 {
+		if name == "" {
 			// Anonymous record, probably inside a typedef.
 			location := f.getUniqueLocationID(pos, cursor)
 			name = f.getUnnamedDeclName("_Ctype_"+cgoRecordPrefix+"__", location)
@@ -856,7 +837,7 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 		typeSpelling := getString(C.clang_getTypeSpelling(typ))
 		typeKindSpelling := getString(C.clang_getTypeKindSpelling(typ.kind))
 		f.addError(pos, fmt.Sprintf("unknown C type: %v (libclang type kind %s)", typeSpelling, typeKindSpelling))
-		typeName = "_Cgo_<unknown>"
+		typeName = "C.<unknown>"
 	}
 	return &ast.Ident{
 		NamePos: pos,
@@ -873,7 +854,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 	var goName string
 	typeSize := C.clang_Type_getSizeOf(underlyingType)
 	switch name {
-	case "_Cgo_char":
+	case "C.char":
 		if typeSize != 1 {
 			// This happens for some very special purpose architectures
 			// (DSPs etc.) that are not currently targeted.
@@ -886,7 +867,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 		case C.CXType_Char_U:
 			goName = "uint8"
 		}
-	case "_Cgo_schar", "_Cgo_short", "_Cgo_int", "_Cgo_long", "_Cgo_longlong":
+	case "C.schar", "C.short", "C.int", "C.long", "C.longlong":
 		switch typeSize {
 		case 1:
 			goName = "int8"
@@ -897,7 +878,7 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 		case 8:
 			goName = "int64"
 		}
-	case "_Cgo_uchar", "_Cgo_ushort", "_Cgo_uint", "_Cgo_ulong", "_Cgo_ulonglong":
+	case "C.uchar", "C.ushort", "C.uint", "C.ulong", "C.ulonglong":
 		switch typeSize {
 		case 1:
 			goName = "uint8"
@@ -916,16 +897,22 @@ func (p *cgoPackage) getIntegerType(name string, cursor clangCursor) *ast.TypeSp
 	}
 
 	// Construct an *ast.TypeSpec for this type.
+	obj := &ast.Object{
+		Kind: ast.Typ,
+		Name: name,
+	}
 	spec := &ast.TypeSpec{
 		Name: &ast.Ident{
 			NamePos: pos,
 			Name:    name,
+			Obj:     obj,
 		},
 		Type: &ast.Ident{
 			NamePos: pos,
 			Name:    goName,
 		},
 	}
+	obj.Decl = spec
 	return spec
 }
 
@@ -1058,6 +1045,7 @@ func tinygo_clang_struct_visitor(c, parent C.GoCXCursor, client_data C.CXClientD
 				pos:      prevField.Names[0].NamePos,
 			})
 			prevField.Names[0].Name = bitfieldName
+			prevField.Names[0].Obj.Name = bitfieldName
 		}
 		prevBitfield := &(*bitfieldList)[len(*bitfieldList)-1]
 		prevBitfield.endBit = bitfieldOffset
@@ -1074,6 +1062,11 @@ func tinygo_clang_struct_visitor(c, parent C.GoCXCursor, client_data C.CXClientD
 		{
 			NamePos: pos,
 			Name:    name,
+			Obj: &ast.Object{
+				Kind: ast.Var,
+				Name: name,
+				Decl: field,
+			},
 		},
 	}
 	fieldList.List = append(fieldList.List, field)

cgo/libclang_config_llvm14.go

@@ -0,0 +1,15 @@
+//go:build !byollvm && llvm14
+
+package cgo
+
+/*
+#cgo linux        CFLAGS:  -I/usr/lib/llvm-14/include
+#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@14/include
+#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@14/include
+#cgo freebsd      CFLAGS:  -I/usr/local/llvm14/include
+#cgo linux        LDFLAGS: -L/usr/lib/llvm-14/lib -lclang
+#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@14/lib -lclang -lffi
+#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@14/lib -lclang -lffi
+#cgo freebsd      LDFLAGS: -L/usr/local/llvm14/lib -lclang
+*/
+import "C"

cgo/libclang_config_llvm15.go

@@ -1,4 +1,4 @@
-//go:build !byollvm && llvm15
+//go:build !byollvm && !llvm14
 
 package cgo
 
@@ -8,8 +8,8 @@ package cgo
 #cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@15/include
 #cgo freebsd      CFLAGS:  -I/usr/local/llvm15/include
 #cgo linux        LDFLAGS: -L/usr/lib/llvm-15/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@15/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@15/lib -lclang
+#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@15/lib -lclang -lffi
+#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@15/lib -lclang -lffi
 #cgo freebsd      LDFLAGS: -L/usr/local/llvm15/lib -lclang
 */
 import "C"

cgo/libclang_config_llvm16.go

@@ -1,21 +0,0 @@
-//go:build !byollvm && llvm16
-
-package cgo
-
-// As of 2023-05-05, there is a packaging issue with LLVM 16 on Debian:
-// https://github.com/llvm/llvm-project/issues/62199
-// A workaround is to fix this locally, using something like this:
-//
-//   ln -sf ../../x86_64-linux-gnu/libclang-16.so.1 /usr/lib/llvm-16/lib/libclang.so
-
-/*
-#cgo linux        CFLAGS:  -I/usr/lib/llvm-16/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@16/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@16/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm16/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-16/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@16/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@16/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm16/lib -lclang
-*/
-import "C"

cgo/libclang_config_llvm17.go

@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm17
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-17 -I/usr/include/llvm-c-17 -I/usr/lib/llvm-17/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@17/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@17/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm17/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-17/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@17/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@17/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm17/lib -lclang
-*/
-import "C"

cgo/libclang_config_llvm18.go

@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm18
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-18 -I/usr/include/llvm-c-18 -I/usr/lib/llvm-18/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@18/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@18/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm18/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-18/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@18/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@18/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm18/lib -lclang
-*/
-import "C"

cgo/libclang_config_llvm19.go

@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm19
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-19 -I/usr/include/llvm-c-19 -I/usr/lib/llvm-19/include -I/usr/lib64/llvm19/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@19/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@19/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm19/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-19/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@19/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@19/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm19/lib -lclang
-*/
-import "C"

cgo/libclang_config_llvm20.go

@@ -1,15 +0,0 @@
-//go:build !byollvm && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19 && !llvm21 && !llvm22
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-20 -I/usr/include/llvm-c-20 -I/usr/lib/llvm-20/include -I/usr/lib64/llvm20/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@20/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@20/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm20/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-20/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@20/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@20/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm20/lib -lclang
-*/
-import "C"

cgo/libclang_config_llvm21.go

@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm21
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-21 -I/usr/include/llvm-c-21 -I/usr/lib/llvm-21/include -I/usr/lib64/llvm21/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@21/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@21/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm21/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-21/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@21/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@21/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm21/lib -lclang
-*/
-import "C"

cgo/libclang_config_llvm22.go

@@ -1,15 +0,0 @@
-//go:build !byollvm && llvm22
-
-package cgo
-
-/*
-#cgo linux        CFLAGS:  -I/usr/include/llvm-22 -I/usr/include/llvm-c-22 -I/usr/lib/llvm-22/include -I/usr/lib64/llvm22/include
-#cgo darwin,amd64 CFLAGS:  -I/usr/local/opt/llvm@22/include
-#cgo darwin,arm64 CFLAGS:  -I/opt/homebrew/opt/llvm@22/include
-#cgo freebsd      CFLAGS:  -I/usr/local/llvm22/include
-#cgo linux        LDFLAGS: -L/usr/lib/llvm-22/lib -lclang
-#cgo darwin,amd64 LDFLAGS: -L/usr/local/opt/llvm@22/lib -lclang
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@22/lib -lclang
-#cgo freebsd      LDFLAGS: -L/usr/local/llvm22/lib -lclang
-*/
-import "C"

cgo/libclang_stubs.c

@@ -77,14 +77,6 @@ CXType tinygo_clang_getEnumDeclIntegerType(CXCursor c) {
 	return clang_getEnumDeclIntegerType(c);
 }
 
-unsigned tinygo_clang_Cursor_isAnonymous(CXCursor c) {
-	return clang_Cursor_isAnonymous(c);
-}
-
 unsigned tinygo_clang_Cursor_isBitField(CXCursor c) {
 	return clang_Cursor_isBitField(c);
-}
-
-unsigned tinygo_clang_Cursor_isMacroFunctionLike(CXCursor c) {
-	return clang_Cursor_isMacroFunctionLike(c);
-}
+}

cgo/security.go

@@ -78,7 +78,6 @@ var validCompilerFlags = []*regexp.Regexp{
 	re(`-f(no-)?(pic|PIC|pie|PIE)`),
 	re(`-f(no-)?plt`),
 	re(`-f(no-)?rtti`),
-	re(`-f(no-)?short-enums`),
 	re(`-f(no-)?split-stack`),
 	re(`-f(no-)?stack-(.+)`),
 	re(`-f(no-)?strict-aliasing`),
@@ -143,7 +142,6 @@ var validLinkerFlags = []*regexp.Regexp{
 	re(`-L([^@\-].*)`),
 	re(`-O`),
 	re(`-O([^@\-].*)`),
-	re(`--export=([^@\-].*)`),
 	re(`-f(no-)?(pic|PIC|pie|PIE)`),
 	re(`-f(no-)?openmp(-simd)?`),
 	re(`-fsanitize=([^@\-].*)`),

cgo/security_test.go

@@ -108,7 +108,6 @@ var goodLinkerFlags = [][]string{
 	{"-Fbar"},
 	{"-lbar"},
 	{"-Lbar"},
-	{"--export=my_symbol"},
 	{"-fpic"},
 	{"-fno-pic"},
 	{"-fPIC"},

cgo/sync.go

@@ -12,17 +12,17 @@ import "C"
 // C. It is useful if an API uses function pointers and you cannot pass a Go
 // pointer but only a C pointer.
 type refMap struct {
-	refs map[unsafe.Pointer]any
+	refs map[unsafe.Pointer]interface{}
 	lock sync.Mutex
 }
 
 // Put stores a value in the map. It can later be retrieved using Get. It must
 // be removed using Remove to avoid memory leaks.
-func (m *refMap) Put(v any) unsafe.Pointer {
+func (m *refMap) Put(v interface{}) unsafe.Pointer {
 	m.lock.Lock()
 	defer m.lock.Unlock()
 	if m.refs == nil {
-		m.refs = make(map[unsafe.Pointer]any, 1)
+		m.refs = make(map[unsafe.Pointer]interface{}, 1)
 	}
 	ref := C.malloc(1)
 	m.refs[ref] = v
@@ -31,7 +31,7 @@ func (m *refMap) Put(v any) unsafe.Pointer {
 
 // Get returns a stored value previously inserted with Put. Use the same
 // reference as you got from Put.
-func (m *refMap) Get(ref unsafe.Pointer) any {
+func (m *refMap) Get(ref unsafe.Pointer) interface{} {
 	m.lock.Lock()
 	defer m.lock.Unlock()
 	return m.refs[ref]

cgo/testdata/basic.out.go

@@ -1,54 +1,39 @@
 package main
 
-import "syscall"
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 
 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )

cgo/testdata/const.go

@@ -3,26 +3,10 @@ package main
 /*
 #define foo 3
 #define bar foo
-
-#define unreferenced 4
-#define referenced unreferenced
-
-#define fnlike() 5
-#define fnlike_val fnlike()
-#define square(n) (n*n)
-#define square_val square(20)
-#define add(a, b) (a + b)
-#define add_val add(3, 5)
 */
 import "C"
 
 const (
 	Foo = C.foo
 	Bar = C.bar
-
-	Baz = C.referenced
-
-	fnlike = C.fnlike_val
-	square = C.square_val
-	add    = C.add_val
 )

cgo/testdata/const.out.go

@@ -1,62 +1,42 @@
 package main
 
-import "syscall"
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 
 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
 
-const _Cgo_foo = 3
-const _Cgo_bar = _Cgo_foo
-const _Cgo_unreferenced = 4
-const _Cgo_referenced = _Cgo_unreferenced
-const _Cgo_fnlike_val = 5
-const _Cgo_square_val = (20 * 20)
-const _Cgo_add_val = (3 + 5)
+const C.foo = 3
+const C.bar = C.foo

cgo/testdata/errors.go

@@ -10,35 +10,20 @@ typedef struct {
 
 typedef someType noType; // undefined type
 
-// Some invalid noescape lines
-#cgo noescape
-#cgo noescape foo bar
-#cgo noescape unusedFunction
-
 #define SOME_CONST_1 5) // invalid const syntax
 #define SOME_CONST_2 6) // const not used (so no error)
 #define SOME_CONST_3 1234 // const too large for byte
-#define   SOME_CONST_b      3   ) // const with lots of weird whitespace (to test error locations)
-#  define SOME_CONST_startspace 3)
 */
 //
 //
 // #define SOME_CONST_4 8) // after some empty lines
-// #cgo CFLAGS: -DSOME_PARAM_CONST_invalid=3/+3
-// #cgo CFLAGS: -DSOME_PARAM_CONST_valid=3+4
 import "C"
 
 // #warning another warning
 import "C"
 
-// #define add(a, b) (a+b)
-// #define add_toomuch add(1, 2, 3)
-// #define add_toolittle add(1)
-import "C"
-
 // Make sure that errors for the following lines won't change with future
 // additions to the CGo preamble.
-//
 //line errors.go:100
 var (
 	// constant too large
@@ -53,15 +38,4 @@ var (
 	_ byte = C.SOME_CONST_3
 
 	_ = C.SOME_CONST_4
-
-	_ = C.SOME_CONST_b
-
-	_ = C.SOME_CONST_startspace
-
-	// constants passed by a command line parameter
-	_ = C.SOME_PARAM_CONST_invalid
-	_ = C.SOME_PARAM_CONST_valid
-
-	_ = C.add_toomuch
-	_ = C.add_toolittle
 )

cgo/testdata/errors.out.go

@@ -1,89 +1,60 @@
 // CGo errors:
-//     testdata/errors.go:14:1: missing function name in #cgo noescape line
-//     testdata/errors.go:15:1: multiple function names in #cgo noescape line
 //     testdata/errors.go:4:2: warning: some warning
 //     testdata/errors.go:11:9: error: unknown type name 'someType'
-//     testdata/errors.go:31:5: warning: another warning
-//     testdata/errors.go:18:23: unexpected token ), expected end of expression
-//     testdata/errors.go:26:26: unexpected token ), expected end of expression
-//     testdata/errors.go:21:33: unexpected token ), expected end of expression
-//     testdata/errors.go:22:34: unexpected token ), expected end of expression
-//     -: unexpected token INT, expected end of expression
-//     testdata/errors.go:35:35: unexpected number of parameters: expected 2, got 3
-//     testdata/errors.go:36:31: unexpected number of parameters: expected 2, got 1
-//     testdata/errors.go:3:1: function "unusedFunction" in #cgo noescape line is not used
+//     testdata/errors.go:22:5: warning: another warning
+//     testdata/errors.go:13:23: unexpected token ), expected end of expression
+//     testdata/errors.go:19:26: unexpected token ), expected end of expression
 
 // Type checking errors after CGo processing:
-//     testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as _Cgo_char value in variable declaration (overflows)
+//     testdata/errors.go:102: cannot use 2 << 10 (untyped int constant 2048) as C.char value in variable declaration (overflows)
 //     testdata/errors.go:105: unknown field z in struct literal
-//     testdata/errors.go:108: undefined: _Cgo_SOME_CONST_1
-//     testdata/errors.go:110: cannot use _Cgo_SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
-//     testdata/errors.go:112: undefined: _Cgo_SOME_CONST_4
-//     testdata/errors.go:114: undefined: _Cgo_SOME_CONST_b
-//     testdata/errors.go:116: undefined: _Cgo_SOME_CONST_startspace
-//     testdata/errors.go:119: undefined: _Cgo_SOME_PARAM_CONST_invalid
-//     testdata/errors.go:122: undefined: _Cgo_add_toomuch
-//     testdata/errors.go:123: undefined: _Cgo_add_toolittle
+//     testdata/errors.go:108: undefined: C.SOME_CONST_1
+//     testdata/errors.go:110: cannot use C.SOME_CONST_3 (untyped int constant 1234) as byte value in variable declaration (overflows)
+//     testdata/errors.go:112: undefined: C.SOME_CONST_4
 
 package main
 
-import "syscall"
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 
 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
-type _Cgo_struct_point_t struct {
-	x _Cgo_int
-	y _Cgo_int
+type C._Ctype_struct___0 struct {
+	x C.int
+	y C.int
 }
-type _Cgo_point_t = _Cgo_struct_point_t
+type C.point_t = C._Ctype_struct___0
 
-const _Cgo_SOME_CONST_3 = 1234
-const _Cgo_SOME_PARAM_CONST_valid = 3 + 4
+const C.SOME_CONST_3 = 1234

cgo/testdata/flags.out.go

@@ -5,58 +5,43 @@
 
 package main
 
-import "syscall"
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 
 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
 
-const _Cgo_BAR = 3
-const _Cgo_FOO_H = 1
+const C.BAR = 3
+const C.FOO_H = 1

cgo/testdata/symbols.go

@@ -9,10 +9,6 @@ static void staticfunc(int x);
 
 // Global variable signatures.
 extern int someValue;
-
-void notEscapingFunction(int *a);
-
-#cgo noescape notEscapingFunction
 */
 import "C"
 
@@ -22,7 +18,6 @@ func accessFunctions() {
 	C.variadic0()
 	C.variadic2(3, 5)
 	C.staticfunc(3)
-	C.notEscapingFunction(nil)
 }
 
 func accessGlobals() {

cgo/testdata/symbols.out.go

@@ -1,84 +1,64 @@
 package main
 
-import "syscall"
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 
 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
 
 //export foo
-func _Cgo_foo(a _Cgo_int, b _Cgo_int) _Cgo_int
+func C.foo(a C.int, b C.int) C.int
 
-var _Cgo_foo$funcaddr unsafe.Pointer
+var C.foo$funcaddr unsafe.Pointer
 
 //export variadic0
 //go:variadic
-func _Cgo_variadic0()
+func C.variadic0()
 
-var _Cgo_variadic0$funcaddr unsafe.Pointer
+var C.variadic0$funcaddr unsafe.Pointer
 
 //export variadic2
 //go:variadic
-func _Cgo_variadic2(x _Cgo_int, y _Cgo_int)
+func C.variadic2(x C.int, y C.int)
 
-var _Cgo_variadic2$funcaddr unsafe.Pointer
+var C.variadic2$funcaddr unsafe.Pointer
 
 //export _Cgo_static_173c95a79b6df1980521_staticfunc
-func _Cgo_staticfunc!symbols.go(x _Cgo_int)
+func C.staticfunc!symbols.go(x C.int)
 
-var _Cgo_staticfunc!symbols.go$funcaddr unsafe.Pointer
+var C.staticfunc!symbols.go$funcaddr unsafe.Pointer
 
-//export notEscapingFunction
-//go:noescape
-func _Cgo_notEscapingFunction(a *_Cgo_int)
-
-var _Cgo_notEscapingFunction$funcaddr unsafe.Pointer
 //go:extern someValue
-var _Cgo_someValue _Cgo_int
+var C.someValue C.int

cgo/testdata/types.out.go

@@ -1,166 +1,149 @@
 package main
 
-import "syscall"
 import "unsafe"
 
 var _ unsafe.Pointer
 
-//go:linkname _Cgo_CString runtime.cgo_CString
-func _Cgo_CString(string) *_Cgo_char
+//go:linkname C.CString runtime.cgo_CString
+func C.CString(string) *C.char
 
-//go:linkname _Cgo_GoString runtime.cgo_GoString
-func _Cgo_GoString(*_Cgo_char) string
+//go:linkname C.GoString runtime.cgo_GoString
+func C.GoString(*C.char) string
 
-//go:linkname _Cgo___GoStringN runtime.cgo_GoStringN
-func _Cgo___GoStringN(*_Cgo_char, uintptr) string
+//go:linkname C.__GoStringN runtime.cgo_GoStringN
+func C.__GoStringN(*C.char, uintptr) string
 
-func _Cgo_GoStringN(cstr *_Cgo_char, length _Cgo_int) string {
-	return _Cgo___GoStringN(cstr, uintptr(length))
+func C.GoStringN(cstr *C.char, length C.int) string {
+	return C.__GoStringN(cstr, uintptr(length))
 }
 
-//go:linkname _Cgo___GoBytes runtime.cgo_GoBytes
-func _Cgo___GoBytes(unsafe.Pointer, uintptr) []byte
+//go:linkname C.__GoBytes runtime.cgo_GoBytes
+func C.__GoBytes(unsafe.Pointer, uintptr) []byte
 
-func _Cgo_GoBytes(ptr unsafe.Pointer, length _Cgo_int) []byte {
-	return _Cgo___GoBytes(ptr, uintptr(length))
-}
-
-//go:linkname _Cgo___CBytes runtime.cgo_CBytes
-func _Cgo___CBytes([]byte) unsafe.Pointer
-
-func _Cgo_CBytes(b []byte) unsafe.Pointer {
-	return _Cgo___CBytes(b)
-}
-
-//go:linkname _Cgo___get_errno_num runtime.cgo_errno
-func _Cgo___get_errno_num() uintptr
-
-func _Cgo___get_errno() error {
-	return syscall.Errno(_Cgo___get_errno_num())
+func C.GoBytes(ptr unsafe.Pointer, length C.int) []byte {
+	return C.__GoBytes(ptr, uintptr(length))
 }
 
 type (
-	_Cgo_char      uint8
-	_Cgo_schar     int8
-	_Cgo_uchar     uint8
-	_Cgo_short     int16
-	_Cgo_ushort    uint16
-	_Cgo_int       int32
-	_Cgo_uint      uint32
-	_Cgo_long      int32
-	_Cgo_ulong     uint32
-	_Cgo_longlong  int64
-	_Cgo_ulonglong uint64
+	C.char      uint8
+	C.schar     int8
+	C.uchar     uint8
+	C.short     int16
+	C.ushort    uint16
+	C.int       int32
+	C.uint      uint32
+	C.long      int32
+	C.ulong     uint32
+	C.longlong  int64
+	C.ulonglong uint64
 )
-type _Cgo_myint = _Cgo_int
-type _Cgo_struct_point2d_t struct {
-	x _Cgo_int
-	y _Cgo_int
+type C.myint = C.int
+type C._Ctype_struct___0 struct {
+	x C.int
+	y C.int
 }
-type _Cgo_point2d_t = _Cgo_struct_point2d_t
-type _Cgo_struct_point3d struct {
-	x _Cgo_int
-	y _Cgo_int
-	z _Cgo_int
+type C.point2d_t = C._Ctype_struct___0
+type C.struct_point3d struct {
+	x C.int
+	y C.int
+	z C.int
 }
-type _Cgo_point3d_t = _Cgo_struct_point3d
-type _Cgo_struct_type1 struct {
-	_type   _Cgo_int
-	__type  _Cgo_int
-	___type _Cgo_int
+type C.point3d_t = C.struct_point3d
+type C.struct_type1 struct {
+	_type   C.int
+	__type  C.int
+	___type C.int
 }
-type _Cgo_struct_type2 struct{ _type _Cgo_int }
-type _Cgo_union_union1_t struct{ i _Cgo_int }
-type _Cgo_union1_t = _Cgo_union_union1_t
-type _Cgo_union_union3_t struct{ $union uint64 }
+type C.struct_type2 struct{ _type C.int }
+type C._Ctype_union___1 struct{ i C.int }
+type C.union1_t = C._Ctype_union___1
+type C._Ctype_union___2 struct{ $union uint64 }
 
-func (union *_Cgo_union_union3_t) unionfield_i() *_Cgo_int {
-	return (*_Cgo_int)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___2) unionfield_i() *C.int {
+	return (*C.int)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union3_t) unionfield_d() *float64 {
+func (union *C._Ctype_union___2) unionfield_d() *float64 {
 	return (*float64)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union3_t) unionfield_s() *_Cgo_short {
-	return (*_Cgo_short)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___2) unionfield_s() *C.short {
+	return (*C.short)(unsafe.Pointer(&union.$union))
 }
 
-type _Cgo_union3_t = _Cgo_union_union3_t
-type _Cgo_union_union2d struct{ $union [2]uint64 }
+type C.union3_t = C._Ctype_union___2
+type C.union_union2d struct{ $union [2]uint64 }
 
-func (union *_Cgo_union_union2d) unionfield_i() *_Cgo_int {
-	return (*_Cgo_int)(unsafe.Pointer(&union.$union))
-}
-func (union *_Cgo_union_union2d) unionfield_d() *[2]float64 {
+func (union *C.union_union2d) unionfield_i() *C.int { return (*C.int)(unsafe.Pointer(&union.$union)) }
+func (union *C.union_union2d) unionfield_d() *[2]float64 {
 	return (*[2]float64)(unsafe.Pointer(&union.$union))
 }
 
-type _Cgo_union2d_t = _Cgo_union_union2d
-type _Cgo_union_unionarray_t struct{ arr [10]_Cgo_uchar }
-type _Cgo_unionarray_t = _Cgo_union_unionarray_t
-type _Cgo__Ctype_union___0 struct{ $union [3]uint32 }
+type C.union2d_t = C.union_union2d
+type C._Ctype_union___3 struct{ arr [10]C.uchar }
+type C.unionarray_t = C._Ctype_union___3
+type C._Ctype_union___5 struct{ $union [3]uint32 }
 
-func (union *_Cgo__Ctype_union___0) unionfield_area() *_Cgo_point2d_t {
-	return (*_Cgo_point2d_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___5) unionfield_area() *C.point2d_t {
+	return (*C.point2d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo__Ctype_union___0) unionfield_solid() *_Cgo_point3d_t {
-	return (*_Cgo_point3d_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___5) unionfield_solid() *C.point3d_t {
+	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
 }
 
-type _Cgo_struct_struct_nested_t struct {
-	begin _Cgo_point2d_t
-	end   _Cgo_point2d_t
-	tag   _Cgo_int
+type C._Ctype_struct___4 struct {
+	begin C.point2d_t
+	end   C.point2d_t
+	tag   C.int
 
-	coord _Cgo__Ctype_union___0
+	coord C._Ctype_union___5
 }
-type _Cgo_struct_nested_t = _Cgo_struct_struct_nested_t
-type _Cgo_union_union_nested_t struct{ $union [2]uint64 }
+type C.struct_nested_t = C._Ctype_struct___4
+type C._Ctype_union___6 struct{ $union [2]uint64 }
 
-func (union *_Cgo_union_union_nested_t) unionfield_point() *_Cgo_point3d_t {
-	return (*_Cgo_point3d_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___6) unionfield_point() *C.point3d_t {
+	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union_nested_t) unionfield_array() *_Cgo_unionarray_t {
-	return (*_Cgo_unionarray_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___6) unionfield_array() *C.unionarray_t {
+	return (*C.unionarray_t)(unsafe.Pointer(&union.$union))
 }
-func (union *_Cgo_union_union_nested_t) unionfield_thing() *_Cgo_union3_t {
-	return (*_Cgo_union3_t)(unsafe.Pointer(&union.$union))
+func (union *C._Ctype_union___6) unionfield_thing() *C.union3_t {
+	return (*C.union3_t)(unsafe.Pointer(&union.$union))
 }
 
-type _Cgo_union_nested_t = _Cgo_union_union_nested_t
-type _Cgo_enum_option = _Cgo_int
-type _Cgo_option_t = _Cgo_enum_option
-type _Cgo_enum_option2_t = _Cgo_uint
-type _Cgo_option2_t = _Cgo_enum_option2_t
-type _Cgo_struct_types_t struct {
+type C.union_nested_t = C._Ctype_union___6
+type C.enum_option = C.int
+type C.option_t = C.enum_option
+type C._Ctype_enum___7 = C.uint
+type C.option2_t = C._Ctype_enum___7
+type C._Ctype_struct___8 struct {
 	f   float32
 	d   float64
-	ptr *_Cgo_int
+	ptr *C.int
 }
-type _Cgo_types_t = _Cgo_struct_types_t
-type _Cgo_myIntArray = [10]_Cgo_int
-type _Cgo_struct_bitfield_t struct {
-	start        _Cgo_uchar
-	__bitfield_1 _Cgo_uchar
+type C.types_t = C._Ctype_struct___8
+type C.myIntArray = [10]C.int
+type C._Ctype_struct___9 struct {
+	start        C.uchar
+	__bitfield_1 C.uchar
 
-	d _Cgo_uchar
-	e _Cgo_uchar
+	d C.uchar
+	e C.uchar
 }
 
-func (s *_Cgo_struct_bitfield_t) bitfield_a() _Cgo_uchar { return s.__bitfield_1 & 0x1f }
-func (s *_Cgo_struct_bitfield_t) set_bitfield_a(value _Cgo_uchar) {
+func (s *C._Ctype_struct___9) bitfield_a() C.uchar { return s.__bitfield_1 & 0x1f }
+func (s *C._Ctype_struct___9) set_bitfield_a(value C.uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x1f | value&0x1f<<0
 }
-func (s *_Cgo_struct_bitfield_t) bitfield_b() _Cgo_uchar {
+func (s *C._Ctype_struct___9) bitfield_b() C.uchar {
 	return s.__bitfield_1 >> 5 & 0x1
 }
-func (s *_Cgo_struct_bitfield_t) set_bitfield_b(value _Cgo_uchar) {
+func (s *C._Ctype_struct___9) set_bitfield_b(value C.uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x20 | value&0x1<<5
 }
-func (s *_Cgo_struct_bitfield_t) bitfield_c() _Cgo_uchar {
+func (s *C._Ctype_struct___9) bitfield_c() C.uchar {
 	return s.__bitfield_1 >> 6
 }
-func (s *_Cgo_struct_bitfield_t) set_bitfield_c(value _Cgo_uchar,
+func (s *C._Ctype_struct___9) set_bitfield_c(value C.uchar,
 
 ) { s.__bitfield_1 = s.__bitfield_1&0x3f | value<<6 }
 
-type _Cgo_bitfield_t = _Cgo_struct_bitfield_t
+type C.bitfield_t = C._Ctype_struct___9

compileopts/config.go

@@ -8,30 +8,18 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"slices"
-	"strconv"
 	"strings"
 
 	"github.com/google/shlex"
 	"github.com/tinygo-org/tinygo/goenv"
 )
 
-// Library versions. Whenever an existing library is changed, this number should
-// be added/increased so that existing caches are invalidated.
-//
-// (This is a bit of a layering violation, this should really be part of the
-// builder.Library struct but that's hard to do since we want to know the
-// library path in advance in several places).
-var libVersions = map[string]int{
-	"musl":  3,
-	"bdwgc": 2,
-}
-
 // Config keeps all configuration affecting the build in a single struct.
 type Config struct {
 	Options        *Options
 	Target         *TargetSpec
 	GoMinorVersion int
+	ClangHeaders   string // Clang built-in header include path
 	TestConfig     TestConfig
 }
 
@@ -46,30 +34,17 @@ func (c *Config) CPU() string {
 	return c.Target.CPU
 }
 
-// The current build mode (like the `-buildmode` command line flag).
-func (c *Config) BuildMode() string {
-	if c.Options.BuildMode != "" {
-		return c.Options.BuildMode
-	}
-	if c.Target.BuildMode != "" {
-		return c.Target.BuildMode
-	}
-	return "default"
-}
-
 // Features returns a list of features this CPU supports. For example, for a
 // RISC-V processor, that could be "+a,+c,+m". For many targets, an empty list
 // will be returned.
 func (c *Config) Features() string {
-	var features string
 	if c.Target.Features == "" {
-		features = c.Options.LLVMFeatures
-	} else if c.Options.LLVMFeatures == "" {
-		features = c.Target.Features
-	} else {
-		features = c.Target.Features + "," + c.Options.LLVMFeatures
+		return c.Options.LLVMFeatures
 	}
-	return patchFeatures(features)
+	if c.Options.LLVMFeatures == "" {
+		return c.Target.Features
+	}
+	return c.Target.Features + "," + c.Options.LLVMFeatures
 }
 
 // ABI returns the -mabi= flag for this target (like -mabi=lp64). A zero-length
@@ -86,7 +61,7 @@ func (c *Config) GOOS() string {
 }
 
 // GOARCH returns the GOARCH of the target. This might not always be the actual
-// architecture: for example, the AVR target is not supported by the Go standard
+// archtecture: for example, the AVR target is not supported by the Go standard
 // library so such targets will usually pretend to be linux/arm.
 func (c *Config) GOARCH() string {
 	return c.Target.GOARCH
@@ -98,27 +73,9 @@ func (c *Config) GOARM() string {
 	return c.Options.GOARM
 }
 
-// GOMIPS will return the GOMIPS environment variable given to the compiler when
-// building a program.
-func (c *Config) GOMIPS() string {
-	return c.Options.GOMIPS
-}
-
 // BuildTags returns the complete list of build tags used during this build.
 func (c *Config) BuildTags() []string {
-	tags := append([]string(nil), c.Target.BuildTags...) // copy slice (avoid a race)
-	tags = append(tags, []string{
-		"tinygo",                                     // that's the compiler
-		"purego",                                     // to get various crypto packages to work
-		"osusergo",                                   // to get os/user to work
-		"math_big_pure_go",                           // to get math/big to work
-		"gc." + c.GC(), "scheduler." + c.Scheduler(), // used inside the runtime package
-		"serial." + c.Serial()}...) // used inside the machine package
-	switch c.Scheduler() {
-	case "threads", "cores":
-	default:
-		tags = append(tags, "tinygo.unicore")
-	}
+	tags := append(c.Target.BuildTags, []string{"tinygo", "math_big_pure_go", "gc." + c.GC(), "scheduler." + c.Scheduler(), "serial." + c.Serial()}...)
 	for i := 1; i <= c.GoMinorVersion; i++ {
 		tags = append(tags, fmt.Sprintf("go1.%d", i))
 	}
@@ -126,6 +83,12 @@ func (c *Config) BuildTags() []string {
 	return tags
 }
 
+// CgoEnabled returns true if (and only if) CGo is enabled. It is true by
+// default and false if CGO_ENABLED is set to "0".
+func (c *Config) CgoEnabled() bool {
+	return goenv.Get("CGO_ENABLED") == "1"
+}
+
 // GC returns the garbage collection strategy in use on this platform. Valid
 // values are "none", "leaking", "conservative" and "precise".
 func (c *Config) GC() string {
@@ -142,8 +105,14 @@ func (c *Config) GC() string {
 // that can be traced by the garbage collector.
 func (c *Config) NeedsStackObjects() bool {
 	switch c.GC() {
-	case "conservative", "custom", "precise", "boehm":
-		return slices.Contains(c.BuildTags(), "tinygo.wasm")
+	case "conservative", "custom", "precise":
+		for _, tag := range c.BuildTags() {
+			if tag == "tinygo.wasm" {
+				return true
+			}
+		}
+
+		return false
 	default:
 		return false
 	}
@@ -176,18 +145,18 @@ func (c *Config) Serial() string {
 
 // OptLevels returns the optimization level (0-2), size level (0-2), and inliner
 // threshold as used in the LLVM optimization pipeline.
-func (c *Config) OptLevel() (level string, speedLevel, sizeLevel int) {
+func (c *Config) OptLevels() (optLevel, sizeLevel int, inlinerThreshold uint) {
 	switch c.Options.Opt {
 	case "none", "0":
-		return "O0", 0, 0
+		return 0, 0, 0 // -O0
 	case "1":
-		return "O1", 1, 0
+		return 1, 0, 0 // -O1
 	case "2":
-		return "O2", 2, 0
+		return 2, 0, 225 // -O2
 	case "s":
-		return "Os", 2, 1
+		return 2, 1, 225 // -Os
 	case "z":
-		return "Oz", 2, 2 // default
+		return 2, 2, 5 // -Oz, default
 	default:
 		// This is not shown to the user: valid choices are already checked as
 		// part of Options.Verify(). It is here as a sanity check.
@@ -221,13 +190,12 @@ func (c *Config) StackSize() uint64 {
 	return c.Target.DefaultStackSize
 }
 
-// MaxStackAlloc returns the size of the maximum allocation to put on the stack vs heap.
-func (c *Config) MaxStackAlloc() uint64 {
-	if c.StackSize() >= 16*1024 {
-		return 1024
-	}
-
-	return 256
+// UseThinLTO returns whether ThinLTO should be used for the given target.
+func (c *Config) UseThinLTO() bool {
+	// All architectures support ThinLTO now. However, this code is kept for the
+	// time being in case there are regressions. The non-ThinLTO code support
+	// should be removed when it is proven to work reliably.
+	return true
 }
 
 // RP2040BootPatch returns whether the RP2040 boot patch should be applied that
@@ -239,40 +207,20 @@ func (c *Config) RP2040BootPatch() bool {
 	return false
 }
 
-// Return a canonicalized architecture name, so we don't have to deal with arm*
-// vs thumb* vs arm64.
-func CanonicalArchName(triple string) string {
-	arch, _, _ := strings.Cut(triple, "-")
-	if arch == "arm64" {
-		return "aarch64"
-	}
+// MuslArchitecture returns the architecture name as used in musl libc. It is
+// usually the same as the first part of the LLVM triple, but not always.
+func MuslArchitecture(triple string) string {
+	arch := strings.Split(triple, "-")[0]
 	if strings.HasPrefix(arch, "arm") || strings.HasPrefix(arch, "thumb") {
-		return "arm"
-	}
-	if arch == "mipsel" {
-		return "mips"
+		arch = "arm"
 	}
 	return arch
 }
 
-// MuslArchitecture returns the architecture name as used in musl libc. It is
-// usually the same as the first part of the LLVM triple, but not always.
-func MuslArchitecture(triple string) string {
-	return CanonicalArchName(triple)
-}
-
-// Returns true if the libc needs to include malloc, for the libcs where this
-// matters.
-func (c *Config) LibcNeedsMalloc() bool {
-	if c.GC() == "boehm" && c.Target.Libc == "wasi-libc" {
-		return true
-	}
-	return false
-}
-
-// LibraryPath returns the path to the library build directory. The path will be
-// a library path in the cache directory (which might not yet be built).
-func (c *Config) LibraryPath(name string) string {
+// LibcPath returns the path to the libc directory. The libc path will be either
+// a precompiled libc shipped with a TinyGo build, or a libc path in the cache
+// directory (which might not yet be built).
+func (c *Config) LibcPath(name string) (path string, precompiled bool) {
 	archname := c.Triple()
 	if c.CPU() != "" {
 		archname += "-" + c.CPU()
@@ -280,27 +228,18 @@ func (c *Config) LibraryPath(name string) string {
 	if c.ABI() != "" {
 		archname += "-" + c.ABI()
 	}
-	if c.Target.SoftFloat {
-		archname += "-softfloat"
-	}
-	if name == "bdwgc" {
-		// Boehm GC is compiled against a particular libc.
-		archname += "-" + c.Target.Libc
-	}
 
-	// Append a version string, if this library has a version.
-	if v, ok := libVersions[name]; ok {
-		archname += "-v" + strconv.Itoa(v)
-	}
-
-	options := ""
-	if c.LibcNeedsMalloc() {
-		options += "+malloc"
+	// Try to load a precompiled library.
+	precompiledDir := filepath.Join(goenv.Get("TINYGOROOT"), "pkg", archname, name)
+	if _, err := os.Stat(precompiledDir); err == nil {
+		// Found a precompiled library for this OS/architecture. Return the path
+		// directly.
+		return precompiledDir, true
 	}
 
 	// No precompiled library found. Determine the path name that will be used
 	// in the build cache.
-	return filepath.Join(goenv.Get("GOCACHE"), name+options+"-"+archname)
+	return filepath.Join(goenv.Get("GOCACHE"), name+"-"+archname), false
 }
 
 // DefaultBinaryExtension returns the default extension for binaries, such as
@@ -328,28 +267,62 @@ func (c *Config) DefaultBinaryExtension() string {
 
 // CFlags returns the flags to pass to the C compiler. This is necessary for CGo
 // preprocessing.
-func (c *Config) CFlags(libclang bool) []string {
+func (c *Config) CFlags() []string {
 	var cflags []string
 	for _, flag := range c.Target.CFlags {
 		cflags = append(cflags, strings.ReplaceAll(flag, "{root}", goenv.Get("TINYGOROOT")))
 	}
-	resourceDir := goenv.ClangResourceDir(libclang)
-	if resourceDir != "" {
-		// The resource directory contains the built-in clang headers like
-		// stdbool.h, stdint.h, float.h, etc.
-		// It is left empty if we're using an external compiler (that already
-		// knows these headers).
+	switch c.Target.Libc {
+	case "darwin-libSystem":
+		root := goenv.Get("TINYGOROOT")
 		cflags = append(cflags,
-			"-resource-dir="+resourceDir,
+			"--sysroot="+filepath.Join(root, "lib/macos-minimal-sdk/src"),
 		)
+	case "picolibc":
+		root := goenv.Get("TINYGOROOT")
+		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
+		path, _ := c.LibcPath("picolibc")
+		cflags = append(cflags,
+			"--sysroot="+path,
+			"-isystem", filepath.Join(path, "include"), // necessary for Xtensa
+			"-isystem", filepath.Join(picolibcDir, "include"),
+			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
+		)
+	case "musl":
+		root := goenv.Get("TINYGOROOT")
+		path, _ := c.LibcPath("musl")
+		arch := MuslArchitecture(c.Triple())
+		cflags = append(cflags,
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
+			"-isystem", filepath.Join(root, "lib", "musl", "arch", arch),
+			"-isystem", filepath.Join(root, "lib", "musl", "include"),
+		)
+	case "wasi-libc":
+		root := goenv.Get("TINYGOROOT")
+		cflags = append(cflags, "--sysroot="+root+"/lib/wasi-libc/sysroot")
+	case "mingw-w64":
+		root := goenv.Get("TINYGOROOT")
+		path, _ := c.LibcPath("mingw-w64")
+		cflags = append(cflags,
+			"--sysroot="+path,
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "crt"),
+			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "defaults", "include"),
+			"-D_UCRT",
+		)
+	case "":
+		// No libc specified, nothing to add.
+	default:
+		// Incorrect configuration. This could be handled in a better way, but
+		// usually this will be found by developers (not by TinyGo users).
+		panic("unknown libc: " + c.Target.Libc)
 	}
-	cflags = append(cflags, c.LibcCFlags()...)
 	// Always emit debug information. It is optionally stripped at link time.
 	cflags = append(cflags, "-gdwarf-4")
 	// Use the same optimization level as TinyGo.
 	cflags = append(cflags, "-O"+c.Options.Opt)
 	// Set the LLVM target triple.
-	cflags = append(cflags, "--target="+ClangTriple(c.Triple()))
+	cflags = append(cflags, "--target="+c.Triple())
 	// Set the -mcpu (or similar) flag.
 	if c.Target.CPU != "" {
 		if c.GOARCH() == "amd64" || c.GOARCH() == "386" {
@@ -370,80 +343,6 @@ func (c *Config) CFlags(libclang bool) []string {
 	return cflags
 }
 
-// LibcCFlags returns the C compiler flags for the configured libc.
-// It only uses flags that are part of the libc path (triple, cpu, abi, libc
-// name) so it can safely be used to compile another C library.
-func (c *Config) LibcCFlags() []string {
-	switch c.Target.Libc {
-	case "darwin-libSystem":
-		root := goenv.Get("TINYGOROOT")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(root, "lib/macos-minimal-sdk/src/usr/include"),
-		}
-	case "picolibc":
-		root := goenv.Get("TINYGOROOT")
-		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
-		path := c.LibraryPath("picolibc")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(picolibcDir, "include"),
-			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
-			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
-		}
-	case "musl":
-		root := goenv.Get("TINYGOROOT")
-		path := c.LibraryPath("musl")
-		arch := MuslArchitecture(c.Triple())
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(root, "lib", "musl", "arch", arch),
-			"-isystem", filepath.Join(root, "lib", "musl", "arch", "generic"),
-			"-isystem", filepath.Join(root, "lib", "musl", "include"),
-		}
-	case "wasi-libc":
-		path := c.LibraryPath("wasi-libc")
-		return []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-		}
-	case "wasmbuiltins":
-		// nothing to add (library is purely for builtins)
-		return nil
-	case "mingw-w64":
-		root := goenv.Get("TINYGOROOT")
-		path := c.LibraryPath("mingw-w64")
-		cflags := []string{
-			"-nostdlibinc",
-			"-isystem", filepath.Join(path, "include"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "crt"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "include"),
-			"-isystem", filepath.Join(root, "lib", "mingw-w64", "mingw-w64-headers", "defaults", "include"),
-		}
-		if c.GOARCH() == "386" {
-			cflags = append(cflags,
-				"-D__MSVCRT_VERSION__=0x700", // Microsoft Visual C++ .NET 2002
-				"-D_WIN32_WINNT=0x0501",      // target Windows XP
-			)
-		} else {
-			cflags = append(cflags,
-				"-D_UCRT",
-				"-D_WIN32_WINNT=0x0a00", // target Windows 10
-			)
-		}
-		return cflags
-	case "":
-		// No libc specified, nothing to add.
-		return nil
-	default:
-		// Incorrect configuration. This could be handled in a better way, but
-		// usually this will be found by developers (not by TinyGo users).
-		panic("unknown libc: " + c.Target.Libc)
-	}
-}
-
 // LDFlags returns the flags to pass to the linker. A few more flags are needed
 // (like the one for the compiler runtime), but this represents the majority of
 // the flags.
@@ -458,27 +357,9 @@ func (c *Config) LDFlags() []string {
 	if c.Target.LinkerScript != "" {
 		ldflags = append(ldflags, "-T", c.Target.LinkerScript)
 	}
-	ldflags = append(ldflags, c.Options.ExtLDFlags...)
-
 	return ldflags
 }
 
-// LinkerFlavor returns how the configured linker should be driven.
-// Usually this is derived from GOOS, but targets may override it explicitly.
-func (c *Config) LinkerFlavor() string {
-	if c.Target.LinkerFlavor != "" {
-		return c.Target.LinkerFlavor
-	}
-	switch c.GOOS() {
-	case "windows":
-		return "coff"
-	case "darwin":
-		return "darwin"
-	default:
-		return "gnu"
-	}
-}
-
 // ExtraFiles returns the list of extra files to be built and linked with the
 // executable. This can include extra C and assembly files.
 func (c *Config) ExtraFiles() []string {
@@ -543,16 +424,16 @@ func (c *Config) BinaryFormat(ext string) string {
 
 // Programmer returns the flash method and OpenOCD interface name given a
 // particular configuration. It may either be all configured in the target JSON
-// file or be modified using the -programmer command-line option.
+// file or be modified using the -programmmer command-line option.
 func (c *Config) Programmer() (method, openocdInterface string) {
 	switch c.Options.Programmer {
 	case "":
 		// No configuration supplied.
 		return c.Target.FlashMethod, c.Target.OpenOCDInterface
-	case "openocd", "msd", "command", "adb":
+	case "openocd", "msd", "command":
 		// The -programmer flag only specifies the flash method.
 		return c.Options.Programmer, c.Target.OpenOCDInterface
-	case "bmp", "probe-rs":
+	case "bmp":
 		// The -programmer flag only specifies the flash method.
 		return c.Options.Programmer, ""
 	default:
@@ -583,6 +464,9 @@ func (c *Config) OpenOCDConfiguration() (args []string, err error) {
 		return nil, fmt.Errorf("unknown OpenOCD transport: %#v", c.Target.OpenOCDTransport)
 	}
 	args = []string{"-f", "interface/" + openocdInterface + ".cfg"}
+	for _, cmd := range c.Target.OpenOCDCommands {
+		args = append(args, "-c", cmd)
+	}
 	if c.Target.OpenOCDTransport != "" {
 		transport := c.Target.OpenOCDTransport
 		if transport == "swd" {
@@ -594,9 +478,6 @@ func (c *Config) OpenOCDConfiguration() (args []string, err error) {
 		args = append(args, "-c", "transport select "+transport)
 	}
 	args = append(args, "-f", "target/"+c.Target.OpenOCDTarget+".cfg")
-	for _, cmd := range c.Target.OpenOCDCommands {
-		args = append(args, "-c", cmd)
-	}
 	return args, nil
 }
 
@@ -619,6 +500,11 @@ func (c *Config) RelocationModel() string {
 	return "static"
 }
 
+// WasmAbi returns the WASM ABI which is specified in the target JSON file.
+func (c *Config) WasmAbi() string {
+	return c.Target.WasmAbi
+}
+
 // EmulatorName is a shorthand to get the command for this emulator, something
 // like qemu-system-arm or simavr.
 func (c *Config) EmulatorName() string {
@@ -662,14 +548,5 @@ func (c *Config) Emulator(format, binary string) ([]string, error) {
 
 type TestConfig struct {
 	CompileTestBinary bool
-	CompileOnly       bool
-	Verbose           bool
-	Short             bool
-	RunRegexp         string
-	SkipRegexp        string
-	Count             *int
-	BenchRegexp       string
-	BenchTime         string
-	BenchMem          bool
-	Shuffle           string
+	// TODO: Filter the test functions to run, include verbose flag, etc
 }

compileopts/features_default.go

@@ -1,9 +0,0 @@
-//go:build !llvm22 && !llvm14 && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19
-
-package compileopts
-
-// patchFeatures applies LLVM-version-specific feature name mappings.
-// For LLVM 20/21, features in the target JSON files are already correct.
-func patchFeatures(features string) string {
-	return features
-}

compileopts/features_llvm22.go

@@ -1,26 +0,0 @@
-//go:build llvm22
-
-package compileopts
-
-import "strings"
-
-// patchFeatures applies LLVM-version-specific feature name mappings.
-// LLVM 22 renamed several Xtensa target features.
-func patchFeatures(features string) string {
-	// Xtensa feature renames in LLVM 22:
-	//   atomctl → (removed, no direct replacement)
-	//   memctl  → (removed, no direct replacement)
-	//   esp32s3 → esp32s3ops
-	//   timerint → timers3 (for esp32/esp32s3) or timers1 (for esp8266)
-	// Since we can't distinguish which timer variant at this level,
-	// just remove the obsolete features. The CPU definition already
-	// implies the correct features in LLVM 22.
-	replacer := strings.NewReplacer(
-		"+atomctl,", "",
-		"+memctl,", "",
-		"+esp32s3,", "+esp32s3ops,",
-		"+timerint,", "",
-		",+timerint", "",
-	)
-	return replacer.Replace(features)
-}

compileopts/features_pre20.go

@@ -1,16 +0,0 @@
-//go:build llvm14 || llvm15 || llvm16 || llvm17 || llvm18 || llvm19
-
-package compileopts
-
-import "strings"
-
-// patchFeatures applies LLVM-version-specific feature name mappings.
-// LLVM 19 and earlier do not have +bulk-memory-opt or
-// +call-indirect-overlong for WebAssembly (added in LLVM 20).
-func patchFeatures(features string) string {
-	features = strings.ReplaceAll(features, ",+bulk-memory-opt", "")
-	features = strings.ReplaceAll(features, "+bulk-memory-opt,", "")
-	features = strings.ReplaceAll(features, ",+call-indirect-overlong", "")
-	features = strings.ReplaceAll(features, "+call-indirect-overlong,", "")
-	return features
-}

compileopts/options.go

@@ -3,17 +3,15 @@ package compileopts
 import (
 	"fmt"
 	"regexp"
-	"slices"
 	"strings"
 	"time"
 )
 
 var (
-	validBuildModeOptions     = []string{"default", "c-shared", "wasi-legacy"}
-	validGCOptions            = []string{"none", "leaking", "conservative", "custom", "precise", "boehm"}
-	validSchedulerOptions     = []string{"none", "tasks", "asyncify", "threads", "cores"}
-	validSerialOptions        = []string{"none", "uart", "usb", "rtt"}
-	validPrintSizeOptions     = []string{"none", "short", "full", "html"}
+	validGCOptions            = []string{"none", "leaking", "conservative", "custom", "precise"}
+	validSchedulerOptions     = []string{"none", "tasks", "asyncify"}
+	validSerialOptions        = []string{"none", "uart", "usb"}
+	validPrintSizeOptions     = []string{"none", "short", "full"}
 	validPanicStrategyOptions = []string{"print", "trap"}
 	validOptOptions           = []string{"none", "0", "1", "2", "s", "z"}
 )
@@ -22,61 +20,44 @@ var (
 // usually passed from the command line, but can also be passed in environment
 // variables for example.
 type Options struct {
-	GOOS                    string // environment variable
-	GOARCH                  string // environment variable
-	GOARM                   string // environment variable (only used with GOARCH=arm)
-	GOMIPS                  string // environment variable (only used with GOARCH=mips and GOARCH=mipsle)
-	Directory               string // working dir, leave it unset to use the current working dir
-	Target                  string
-	BuildMode               string // -buildmode flag
-	Opt                     string
-	GC                      string
-	PanicStrategy           string
-	Scheduler               string
-	StackSize               uint64 // goroutine stack size (if none could be automatically determined)
-	Serial                  string
-	Work                    bool // -work flag to print temporary build directory
-	InterpTimeout           time.Duration
-	InterpMaxLoopIterations int
-	PrintIR                 bool
-	DumpSSA                 bool
-	VerifyIR                bool
-	SkipDWARF               bool
-	PrintCommands           func(cmd string, args ...string) `json:"-"`
-	Semaphore               chan struct{}                    `json:"-"` // -p flag controls cap
-	Debug                   bool
-	Nobounds                bool
-	PrintSizes              string
-	PrintAllocs             *regexp.Regexp // regexp string
-	PrintAllocsCover        bool           // emit allocs in go coverage tool format
-	PrintStacks             bool
-	Tags                    []string
-	GlobalValues            map[string]map[string]string // map[pkgpath]map[varname]value
-	TestConfig              TestConfig
-	Programmer              string
-	OpenOCDCommands         []string
-	LLVMFeatures            string
-	Monitor                 bool
-	BaudRate                int
-	Timeout                 time.Duration
-	WITPackage              string // pass through to wasm-tools component embed invocation
-	WITWorld                string // pass through to wasm-tools component embed -w option
-	ExtLDFlags              []string
-	GoCompatibility         bool // enable to check for Go version compatibility
+	GOOS            string // environment variable
+	GOARCH          string // environment variable
+	GOARM           string // environment variable (only used with GOARCH=arm)
+	Target          string
+	Opt             string
+	GC              string
+	PanicStrategy   string
+	Scheduler       string
+	StackSize       uint64 // goroutine stack size (if none could be automatically determined)
+	Serial          string
+	Work            bool // -work flag to print temporary build directory
+	InterpTimeout   time.Duration
+	PrintIR         bool
+	DumpSSA         bool
+	VerifyIR        bool
+	PrintCommands   func(cmd string, args ...string) `json:"-"`
+	Semaphore       chan struct{}                    `json:"-"` // -p flag controls cap
+	Debug           bool
+	PrintSizes      string
+	PrintAllocs     *regexp.Regexp // regexp string
+	PrintStacks     bool
+	Tags            []string
+	GlobalValues    map[string]map[string]string // map[pkgpath]map[varname]value
+	TestConfig      TestConfig
+	Programmer      string
+	OpenOCDCommands []string
+	LLVMFeatures    string
+	Directory       string
+	PrintJSON       bool
+	Monitor         bool
+	BaudRate        int
+	Timeout         time.Duration
 }
 
 // Verify performs a validation on the given options, raising an error if options are not valid.
 func (o *Options) Verify() error {
-	if o.BuildMode != "" {
-		valid := slices.Contains(validBuildModeOptions, o.BuildMode)
-		if !valid {
-			return fmt.Errorf(`invalid buildmode option '%s': valid values are %s`,
-				o.BuildMode,
-				strings.Join(validBuildModeOptions, ", "))
-		}
-	}
 	if o.GC != "" {
-		valid := slices.Contains(validGCOptions, o.GC)
+		valid := isInArray(validGCOptions, o.GC)
 		if !valid {
 			return fmt.Errorf(`invalid gc option '%s': valid values are %s`,
 				o.GC,
@@ -85,7 +66,7 @@ func (o *Options) Verify() error {
 	}
 
 	if o.Scheduler != "" {
-		valid := slices.Contains(validSchedulerOptions, o.Scheduler)
+		valid := isInArray(validSchedulerOptions, o.Scheduler)
 		if !valid {
 			return fmt.Errorf(`invalid scheduler option '%s': valid values are %s`,
 				o.Scheduler,
@@ -94,7 +75,7 @@ func (o *Options) Verify() error {
 	}
 
 	if o.Serial != "" {
-		valid := slices.Contains(validSerialOptions, o.Serial)
+		valid := isInArray(validSerialOptions, o.Serial)
 		if !valid {
 			return fmt.Errorf(`invalid serial option '%s': valid values are %s`,
 				o.Serial,
@@ -103,7 +84,7 @@ func (o *Options) Verify() error {
 	}
 
 	if o.PrintSizes != "" {
-		valid := slices.Contains(validPrintSizeOptions, o.PrintSizes)
+		valid := isInArray(validPrintSizeOptions, o.PrintSizes)
 		if !valid {
 			return fmt.Errorf(`invalid size option '%s': valid values are %s`,
 				o.PrintSizes,
@@ -112,7 +93,7 @@ func (o *Options) Verify() error {
 	}
 
 	if o.PanicStrategy != "" {
-		valid := slices.Contains(validPanicStrategyOptions, o.PanicStrategy)
+		valid := isInArray(validPanicStrategyOptions, o.PanicStrategy)
 		if !valid {
 			return fmt.Errorf(`invalid panic option '%s': valid values are %s`,
 				o.PanicStrategy,
@@ -121,10 +102,19 @@ func (o *Options) Verify() error {
 	}
 
 	if o.Opt != "" {
-		if !slices.Contains(validOptOptions, o.Opt) {
+		if !isInArray(validOptOptions, o.Opt) {
 			return fmt.Errorf("invalid -opt=%s: valid values are %s", o.Opt, strings.Join(validOptOptions, ", "))
 		}
 	}
 
 	return nil
 }
+
+func isInArray(arr []string, item string) bool {
+	for _, i := range arr {
+		if i == item {
+			return true
+		}
+	}
+	return false
+}

compileopts/options_test.go

@@ -9,9 +9,9 @@ import (
 
 func TestVerifyOptions(t *testing.T) {
 
-	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, conservative, custom, precise, boehm`)
-	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, asyncify, threads, cores`)
-	expectedPrintSizeError := errors.New(`invalid size option 'incorrect': valid values are none, short, full, html`)
+	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, conservative, custom, precise`)
+	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, asyncify`)
+	expectedPrintSizeError := errors.New(`invalid size option 'incorrect': valid values are none, short, full`)
 	expectedPanicStrategyError := errors.New(`invalid panic option 'incorrect': valid values are print, trap`)
 
 	testCases := []struct {

compileopts/target.go

@@ -23,56 +23,46 @@ import (
 // https://doc.rust-lang.org/nightly/nightly-rustc/rustc_target/spec/struct.TargetOptions.html
 // https://github.com/shepmaster/rust-arduino-blink-led-no-core-with-cargo/blob/master/blink/arduino.json
 type TargetSpec struct {
-	Inherits         []string `json:"inherits,omitempty"`
-	InheritableOnly  bool     `json:"inheritable-only"` // this target is only meant to be inherited from, not used directly
-	Triple           string   `json:"llvm-target,omitempty"`
-	CPU              string   `json:"cpu,omitempty"`
-	ABI              string   `json:"target-abi,omitempty"` // roughly equivalent to -mabi= flag
-	Features         string   `json:"features,omitempty"`
-	GOOS             string   `json:"goos,omitempty"`
-	GOARCH           string   `json:"goarch,omitempty"`
-	SoftFloat        bool     // used for non-baremetal systems (GOMIPS=softfloat etc)
-	BuildTags        []string `json:"build-tags,omitempty"`
-	BuildMode        string   `json:"buildmode,omitempty"` // default build mode (if nothing specified)
-	GC               string   `json:"gc,omitempty"`
-	Scheduler        string   `json:"scheduler,omitempty"`
-	Serial           string   `json:"serial,omitempty"` // which serial output to use (uart, usb, none)
-	Linker           string   `json:"linker,omitempty"`
-	LinkerFlavor     string   `json:"linker-flavor,omitempty"` // how to drive the configured linker (for example: gnu, coff, darwin)
-	RTLib            string   `json:"rtlib,omitempty"`         // compiler runtime library (libgcc, compiler-rt)
-	Libc             string   `json:"libc,omitempty"`
-	AutoStackSize    *bool    `json:"automatic-stack-size,omitempty"` // Determine stack size automatically at compile time.
-	DefaultStackSize uint64   `json:"default-stack-size,omitempty"`   // Default stack size if the size couldn't be determined at compile time.
-	CFlags           []string `json:"cflags,omitempty"`
-	LDFlags          []string `json:"ldflags,omitempty"`
-	LinkerScript     string   `json:"linkerscript,omitempty"`
-	ExtraFiles       []string `json:"extra-files,omitempty"`
-	RP2040BootPatch  *bool    `json:"rp2040-boot-patch,omitempty"` // Patch RP2040 2nd stage bootloader checksum
-	BootPatches      []string `json:"boot-patches,omitempty"`      // Bootloader patches to be applied in the order they appear.
-	Emulator         string   `json:"emulator,omitempty"`
-	FlashCommand     string   `json:"flash-command,omitempty"`
-	GDB              []string `json:"gdb,omitempty"`
-	PortReset        string   `json:"flash-1200-bps-reset,omitempty"`
-	SerialPort       []string `json:"serial-port,omitempty"` // serial port IDs in the form "vid:pid"
-	FlashMethod      string   `json:"flash-method,omitempty"`
-	FlashVolume      []string `json:"msd-volume-name,omitempty"`
-	FlashFilename    string   `json:"msd-firmware-name,omitempty"`
-	UF2FamilyID      string   `json:"uf2-family-id,omitempty"`
-	BinaryFormat     string   `json:"binary-format,omitempty"`
-	OpenOCDInterface string   `json:"openocd-interface,omitempty"`
-	OpenOCDTarget    string   `json:"openocd-target,omitempty"`
-	OpenOCDTransport string   `json:"openocd-transport,omitempty"`
-	OpenOCDCommands  []string `json:"openocd-commands,omitempty"`
-	OpenOCDVerify    *bool    `json:"openocd-verify,omitempty"` // enable verify when flashing with openocd
-	JLinkDevice      string   `json:"jlink-device,omitempty"`
-	ADBPreCommands   []string `json:"adb-pre-commands,omitempty"`
-	ADBPushRemote    string   `json:"adb-push-remote,omitempty"`
-	ADBPostCommands  []string `json:"adb-post-commands,omitempty"`
-	ProbeRSChip      string   `json:"probe-rs-chip,omitempty"`
-	CodeModel        string   `json:"code-model,omitempty"`
-	RelocationModel  string   `json:"relocation-model,omitempty"`
-	WITPackage       string   `json:"wit-package,omitempty"`
-	WITWorld         string   `json:"wit-world,omitempty"`
+	Inherits         []string `json:"inherits"`
+	Triple           string   `json:"llvm-target"`
+	CPU              string   `json:"cpu"`
+	ABI              string   `json:"target-abi"` // rougly equivalent to -mabi= flag
+	Features         string   `json:"features"`
+	GOOS             string   `json:"goos"`
+	GOARCH           string   `json:"goarch"`
+	BuildTags        []string `json:"build-tags"`
+	GC               string   `json:"gc"`
+	Scheduler        string   `json:"scheduler"`
+	Serial           string   `json:"serial"` // which serial output to use (uart, usb, none)
+	Linker           string   `json:"linker"`
+	RTLib            string   `json:"rtlib"` // compiler runtime library (libgcc, compiler-rt)
+	Libc             string   `json:"libc"`
+	AutoStackSize    *bool    `json:"automatic-stack-size"` // Determine stack size automatically at compile time.
+	DefaultStackSize uint64   `json:"default-stack-size"`   // Default stack size if the size couldn't be determined at compile time.
+	CFlags           []string `json:"cflags"`
+	LDFlags          []string `json:"ldflags"`
+	LinkerScript     string   `json:"linkerscript"`
+	ExtraFiles       []string `json:"extra-files"`
+	RP2040BootPatch  *bool    `json:"rp2040-boot-patch"` // Patch RP2040 2nd stage bootloader checksum
+	Emulator         string   `json:"emulator"`
+	FlashCommand     string   `json:"flash-command"`
+	GDB              []string `json:"gdb"`
+	PortReset        string   `json:"flash-1200-bps-reset"`
+	SerialPort       []string `json:"serial-port"` // serial port IDs in the form "vid:pid"
+	FlashMethod      string   `json:"flash-method"`
+	FlashVolume      string   `json:"msd-volume-name"`
+	FlashFilename    string   `json:"msd-firmware-name"`
+	UF2FamilyID      string   `json:"uf2-family-id"`
+	BinaryFormat     string   `json:"binary-format"`
+	OpenOCDInterface string   `json:"openocd-interface"`
+	OpenOCDTarget    string   `json:"openocd-target"`
+	OpenOCDTransport string   `json:"openocd-transport"`
+	OpenOCDCommands  []string `json:"openocd-commands"`
+	OpenOCDVerify    *bool    `json:"openocd-verify"` // enable verify when flashing with openocd
+	JLinkDevice      string   `json:"jlink-device"`
+	CodeModel        string   `json:"code-model"`
+	RelocationModel  string   `json:"relocation-model"`
+	WasmAbi          string   `json:"wasm-abi"`
 }
 
 // overrideProperties overrides all properties that are set in child into itself using reflection.
@@ -95,10 +85,6 @@ func (spec *TargetSpec) overrideProperties(child *TargetSpec) error {
 			if src.Uint() != 0 {
 				dst.Set(src)
 			}
-		case reflect.Bool:
-			if src.Bool() {
-				dst.Set(src)
-			}
 		case reflect.Ptr: // for pointers, copy if not nil
 			if !src.IsNil() {
 				dst.Set(src)
@@ -154,11 +140,6 @@ func (spec *TargetSpec) loadFromGivenStr(str string) error {
 
 // resolveInherits loads inherited targets, recursively.
 func (spec *TargetSpec) resolveInherits() error {
-	// Save InheritableOnly before resolving, since it must not propagate
-	// from parent to child (a board target should not become inheritable-only
-	// just because its parent processor target is).
-	inheritableOnly := spec.InheritableOnly
-
 	// First create a new spec with all the inherited properties.
 	newSpec := &TargetSpec{}
 	for _, name := range spec.Inherits {
@@ -184,31 +165,60 @@ func (spec *TargetSpec) resolveInherits() error {
 	}
 	*spec = *newSpec
 
-	// Restore InheritableOnly from the original spec, not from parents.
-	spec.InheritableOnly = inheritableOnly
-
 	return nil
 }
 
 // Load a target specification.
 func LoadTarget(options *Options) (*TargetSpec, error) {
-	if options.Target == "" && options.GOARCH == "wasm" {
-		// Set a specific target if we're building from a known GOOS/GOARCH
-		// combination that is defined in a target JSON file.
-		switch options.GOOS {
-		case "js":
-			options.Target = "wasm"
-		case "wasip1":
-			options.Target = "wasip1"
-		case "wasip2":
-			options.Target = "wasip2"
-		default:
-			return nil, errors.New("GOARCH=wasm but GOOS is not set correctly. Please set GOOS to js, wasip1, or wasip2.")
-		}
-	}
-
 	if options.Target == "" {
-		return defaultTarget(options)
+		// Configure based on GOOS/GOARCH environment variables (falling back to
+		// runtime.GOOS/runtime.GOARCH), and generate a LLVM target based on it.
+		var llvmarch string
+		switch options.GOARCH {
+		case "386":
+			llvmarch = "i386"
+		case "amd64":
+			llvmarch = "x86_64"
+		case "arm64":
+			llvmarch = "aarch64"
+		case "arm":
+			switch options.GOARM {
+			case "5":
+				llvmarch = "armv5"
+			case "6":
+				llvmarch = "armv6"
+			case "7":
+				llvmarch = "armv7"
+			default:
+				return nil, fmt.Errorf("invalid GOARM=%s, must be 5, 6, or 7", options.GOARM)
+			}
+		default:
+			llvmarch = options.GOARCH
+		}
+		llvmvendor := "unknown"
+		llvmos := options.GOOS
+		if llvmos == "darwin" {
+			// Use macosx* instead of darwin, otherwise darwin/arm64 will refer
+			// to iOS!
+			llvmos = "macosx10.12.0"
+			if llvmarch == "aarch64" {
+				// Looks like Apple prefers to call this architecture ARM64
+				// instead of AArch64.
+				llvmarch = "arm64"
+				llvmos = "macosx11.0.0"
+			}
+			llvmvendor = "apple"
+		}
+		// Target triples (which actually have four components, but are called
+		// triples for historical reasons) have the form:
+		//   arch-vendor-os-environment
+		target := llvmarch + "-" + llvmvendor + "-" + llvmos
+		if options.GOOS == "windows" {
+			target += "-gnu"
+		} else if options.GOARCH == "arm" {
+			target += "-gnueabihf"
+		}
+		return defaultTarget(options.GOOS, options.GOARCH, target)
 	}
 
 	// See whether there is a target specification for this target (e.g.
@@ -232,255 +242,78 @@ func LoadTarget(options *Options) (*TargetSpec, error) {
 	return spec, nil
 }
 
-// GetTargetSpecs retrieves target specifications from the TINYGOROOT targets
-// directory.  Only valid target JSON files are considered, and the function
-// returns a map of target names to their respective TargetSpec.
-func GetTargetSpecs() (map[string]*TargetSpec, error) {
-	dir := filepath.Join(goenv.Get("TINYGOROOT"), "targets")
-	entries, err := os.ReadDir(dir)
-	if err != nil {
-		return nil, fmt.Errorf("could not list targets: %w", err)
-	}
-
-	maps := map[string]*TargetSpec{}
-	for _, entry := range entries {
-		entryInfo, err := entry.Info()
-		if err != nil {
-			return nil, fmt.Errorf("could not get entry info: %w", err)
-		}
-		if !entryInfo.Mode().IsRegular() || !strings.HasSuffix(entry.Name(), ".json") {
-			// Only inspect JSON files.
-			continue
-		}
-		path := filepath.Join(dir, entry.Name())
-
-		spec, err := LoadTarget(&Options{Target: path})
-		if err != nil {
-			return nil, fmt.Errorf("could not list target: %w", err)
-		}
-
-		if spec.InheritableOnly {
-			// Skip targets that are only meant to be inherited from, not used directly.
-			continue
-		}
-
-		if spec.FlashMethod == "" && spec.FlashCommand == "" && spec.Emulator == "" {
-			// This doesn't look like a regular target file, but rather like
-			// a parent target (such as targets/cortex-m.json).
-			continue
-		}
-		name := entry.Name()
-		name = name[:len(name)-5]
-		maps[name] = spec
-	}
-	return maps, nil
-}
-
-// Load a target from environment variables (which default to
-// runtime.GOOS/runtime.GOARCH).
-func defaultTarget(options *Options) (*TargetSpec, error) {
+func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
+	// No target spec available. Use the default one, useful on most systems
+	// with a regular OS.
 	spec := TargetSpec{
-		GOOS:             options.GOOS,
-		GOARCH:           options.GOARCH,
-		BuildTags:        []string{options.GOOS, options.GOARCH},
+		Triple:           triple,
+		GOOS:             goos,
+		GOARCH:           goarch,
+		BuildTags:        []string{goos, goarch},
+		GC:               "precise",
+		Scheduler:        "tasks",
 		Linker:           "cc",
 		DefaultStackSize: 1024 * 64, // 64kB
 		GDB:              []string{"gdb"},
 		PortReset:        "false",
 	}
-
-	// Configure target based on GOARCH.
-	var llvmarch string
-	switch options.GOARCH {
+	switch goarch {
 	case "386":
-		llvmarch = "i386"
 		spec.CPU = "pentium4"
-		spec.Features = "+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
+		spec.Features = "+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
 	case "amd64":
-		llvmarch = "x86_64"
 		spec.CPU = "x86-64"
-		spec.Features = "+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
+		spec.Features = "+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
 	case "arm":
 		spec.CPU = "generic"
 		spec.CFlags = append(spec.CFlags, "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
-		subarch := strings.Split(options.GOARM, ",")
-		if len(subarch) > 2 {
-			return nil, fmt.Errorf("invalid GOARM=%s, must be of form <num>,[hardfloat|softfloat]", options.GOARM)
-		}
-		archLevel := subarch[0]
-		var fpu string
-		if len(subarch) >= 2 {
-			fpu = subarch[1]
-		} else {
-			// Pick the default fpu value: softfloat for armv5 and hardfloat
-			// above that.
-			if archLevel == "5" {
-				fpu = "softfloat"
-			} else {
-				fpu = "hardfloat"
-			}
-		}
-		switch fpu {
-		case "softfloat":
-			spec.CFlags = append(spec.CFlags, "-msoft-float")
-			spec.SoftFloat = true
-		case "hardfloat":
-			// Hardware floating point support is the default everywhere except
-			// on ARMv5 where it needs to be enabled explicitly.
-			if archLevel == "5" {
-				spec.CFlags = append(spec.CFlags, "-mfpu=vfpv2")
-			}
-		default:
-			return nil, fmt.Errorf("invalid extension GOARM=%s, must be softfloat or hardfloat", options.GOARM)
-		}
-		switch archLevel {
-		case "5":
-			llvmarch = "armv5"
-			if spec.SoftFloat {
-				spec.Features = "+armv5t,+soft-float,+strict-align,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			} else {
-				spec.Features = "+armv5t,+fp64,+strict-align,+vfp2,+vfp2sp,-aes,-d32,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-neon,-sha2,-thumb-mode,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			}
-		case "6":
-			llvmarch = "armv6"
-			if spec.SoftFloat {
-				spec.Features = "+armv6,+dsp,+soft-float,+strict-align,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			} else {
-				spec.Features = "+armv6,+dsp,+fp64,+strict-align,+vfp2,+vfp2sp,-aes,-d32,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-neon,-sha2,-thumb-mode,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			}
-		case "7":
-			llvmarch = "armv7"
-			if spec.SoftFloat {
-				spec.Features = "+armv7-a,+dsp,+soft-float,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			} else {
-				spec.Features = "+armv7-a,+d32,+dsp,+fp64,+neon,+vfp2,+vfp2sp,+vfp3,+vfp3d16,+vfp3d16sp,+vfp3sp,-aes,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-sha2,-thumb-mode,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
-			}
-		default:
-			return nil, fmt.Errorf("invalid GOARM=%s, must be of form <num>,[hardfloat|softfloat] where num is 5, 6, or 7", options.GOARM)
+		switch strings.Split(triple, "-")[0] {
+		case "armv5":
+			spec.Features = "+armv5t,+strict-align,-aes,-bf16,-d32,-dotprod,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fp64,-fpregs,-fullfp16,-mve.fp,-neon,-sha2,-thumb-mode,-vfp2,-vfp2sp,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
+		case "armv6":
+			spec.Features = "+armv6,+dsp,+fp64,+strict-align,+vfp2,+vfp2sp,-aes,-d32,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-neon,-sha2,-thumb-mode,-vfp3,-vfp3d16,-vfp3d16sp,-vfp3sp,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
+		case "armv7":
+			spec.Features = "+armv7-a,+d32,+dsp,+fp64,+neon,+vfp2,+vfp2sp,+vfp3,+vfp3d16,+vfp3d16sp,+vfp3sp,-aes,-fp-armv8,-fp-armv8d16,-fp-armv8d16sp,-fp-armv8sp,-fp16,-fp16fml,-fullfp16,-sha2,-thumb-mode,-vfp4,-vfp4d16,-vfp4d16sp,-vfp4sp"
 		}
 	case "arm64":
 		spec.CPU = "generic"
-		llvmarch = "aarch64"
-		if options.GOOS == "darwin" {
-			spec.Features = "+ete,+fp-armv8,+neon,+trbe,+v8a"
-			// Looks like Apple prefers to call this architecture ARM64
-			// instead of AArch64.
-			llvmarch = "arm64"
-		} else if options.GOOS == "windows" {
-			spec.Features = "+ete,+fp-armv8,+neon,+trbe,+v8a,-fmv"
-		} else { // linux
-			spec.Features = "+ete,+fp-armv8,+neon,+trbe,+v8a,-fmv,-outline-atomics"
-		}
-	case "mips", "mipsle":
-		spec.CPU = "mips32"
-		spec.CFlags = append(spec.CFlags, "-fno-pic")
-		if options.GOARCH == "mips" {
-			llvmarch = "mips" // big endian
-		} else {
-			llvmarch = "mipsel" // little endian
-		}
-		switch options.GOMIPS {
-		case "hardfloat":
-			spec.Features = "+fpxx,+mips32,+nooddspreg,-noabicalls"
-		case "softfloat":
-			spec.SoftFloat = true
-			spec.Features = "+mips32,+soft-float,-noabicalls"
-			spec.CFlags = append(spec.CFlags, "-msoft-float")
-		default:
-			return nil, fmt.Errorf("invalid GOMIPS=%s: must be hardfloat or softfloat", options.GOMIPS)
-		}
-	case "wasm":
-		return nil, fmt.Errorf("GOARCH=wasm but GOOS is unset. Please set GOOS to js, wasip1, or wasip2.")
-	default:
-		return nil, fmt.Errorf("unknown GOARCH=%s", options.GOARCH)
+		spec.Features = "+neon"
 	}
-
-	// Configure target based on GOOS.
-	llvmos := options.GOOS
-	llvmvendor := "unknown"
-	switch options.GOOS {
-	case "darwin":
-		spec.GC = "boehm"
-		platformVersion := "10.12.0"
-		if options.GOARCH == "arm64" {
-			platformVersion = "11.0.0" // first macosx platform with arm64 support
-		}
-		llvmvendor = "apple"
-		spec.Scheduler = "threads"
+	if goos == "darwin" {
 		spec.Linker = "ld.lld"
 		spec.Libc = "darwin-libSystem"
-		// Use macosx* instead of darwin, otherwise darwin/arm64 will refer to
-		// iOS!
-		llvmos = "macosx" + platformVersion
+		arch := strings.Split(triple, "-")[0]
+		platformVersion := strings.TrimPrefix(strings.Split(triple, "-")[2], "macosx")
 		spec.LDFlags = append(spec.LDFlags,
 			"-flavor", "darwin",
 			"-dead_strip",
-			"-arch", llvmarch,
+			"-arch", arch,
 			"-platform_version", "macos", platformVersion, platformVersion,
 		)
-		spec.ExtraFiles = append(spec.ExtraFiles,
-			"src/internal/futex/futex_darwin.c",
-			"src/internal/task/task_threads.c",
-			"src/runtime/os_darwin.c",
-			"src/runtime/runtime_unix.c",
-			"src/runtime/signal.c")
-	case "linux":
-		spec.GC = "boehm"
-		spec.Scheduler = "threads"
+	} else if goos == "linux" {
 		spec.Linker = "ld.lld"
 		spec.RTLib = "compiler-rt"
 		spec.Libc = "musl"
 		spec.LDFlags = append(spec.LDFlags, "--gc-sections")
-		if options.GOARCH == "arm64" {
-			// Disable outline atomics. For details, see:
-			// https://cpufun.substack.com/p/atomics-in-aarch64
-			// A better way would be to fully support outline atomics, which
-			// makes atomics slightly more efficient on systems with many cores.
-			// But the instructions are only supported on newer aarch64 CPUs, so
-			// this feature is normally put in a system library which does
-			// feature detection for you.
-			// We take the lazy way out and simply disable this feature, instead
-			// of enabling it in compiler-rt (which is a bit more complicated).
-			// We don't really need this feature anyway as we don't even support
-			// proper threading.
-			spec.CFlags = append(spec.CFlags, "-mno-outline-atomics")
-		}
-		spec.ExtraFiles = append(spec.ExtraFiles,
-			"src/internal/futex/futex_linux.c",
-			"src/internal/task/task_threads.c",
-			"src/runtime/runtime_unix.c",
-			"src/runtime/signal.c")
-	case "windows":
-		spec.GC = "boehm"
-		spec.Scheduler = "tasks"
+	} else if goos == "windows" {
 		spec.Linker = "ld.lld"
 		spec.Libc = "mingw-w64"
-		switch options.GOARCH {
-		case "386":
-			spec.LDFlags = append(spec.LDFlags,
-				"-m", "i386pe",
-				"--major-os-version", "4",
-				"--major-subsystem-version", "4",
-			)
-			// __udivdi3 is not present in ucrt it seems.
-			spec.RTLib = "compiler-rt"
+		// Note: using a medium code model, low image base and no ASLR
+		// because Go doesn't really need those features. ASLR patches
+		// around issues for unsafe languages like C/C++ that are not
+		// normally present in Go (without explicitly opting in).
+		// For more discussion:
+		// https://groups.google.com/g/Golang-nuts/c/Jd9tlNc6jUE/m/Zo-7zIP_m3MJ?pli=1
+		switch goarch {
 		case "amd64":
-			// Note: using a medium code model, low image base and no ASLR
-			// because Go doesn't really need those features. ASLR patches
-			// around issues for unsafe languages like C/C++ that are not
-			// normally present in Go (without explicitly opting in).
-			// For more discussion:
-			// https://groups.google.com/g/Golang-nuts/c/Jd9tlNc6jUE/m/Zo-7zIP_m3MJ?pli=1
 			spec.LDFlags = append(spec.LDFlags,
 				"-m", "i386pep",
 				"--image-base", "0x400000",
 			)
-			spec.RTLib = "compiler-rt"
 		case "arm64":
 			spec.LDFlags = append(spec.LDFlags,
 				"-m", "arm64pe",
 			)
-			spec.RTLib = "compiler-rt"
 		}
 		spec.LDFlags = append(spec.LDFlags,
 			"-Bdynamic",
@@ -488,59 +321,24 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 			"--no-insert-timestamp",
 			"--no-dynamicbase",
 		)
-		spec.ExtraFiles = append(spec.ExtraFiles,
-			"src/runtime/runtime_windows.c")
-	case "wasm", "wasip1", "wasip2":
-		return nil, fmt.Errorf("GOOS=%s but GOARCH is unset. Please set GOARCH to wasm", options.GOOS)
-	default:
-		return nil, fmt.Errorf("unknown GOOS=%s", options.GOOS)
+	} else {
+		spec.LDFlags = append(spec.LDFlags, "-no-pie", "-Wl,--gc-sections") // WARNING: clang < 5.0 requires -nopie
 	}
-
-	if spec.GC == "boehm" {
-		// Add this file only when needed. This fixes a build failure on
-		// Windows.
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/gc_boehm.c")
-	}
-
-	// Target triples (which actually have four components, but are called
-	// triples for historical reasons) have the form:
-	//   arch-vendor-os-environment
-	spec.Triple = llvmarch + "-" + llvmvendor + "-" + llvmos
-	if options.GOOS == "windows" {
-		spec.Triple += "-gnu"
-	} else if options.GOOS == "linux" {
-		// We use musl on Linux (not glibc) so we should use -musleabi* instead
-		// of -gnueabi*.
-		// The *hf suffix selects between soft/hard floating point ABI.
-		if spec.SoftFloat {
-			spec.Triple += "-musleabi"
-		} else {
-			spec.Triple += "-musleabihf"
-		}
-	}
-
-	// Add extra assembly files (needed for the scheduler etc).
-	if options.GOARCH != "wasm" {
+	if goarch != "wasm" {
 		suffix := ""
-		if options.GOOS == "windows" && options.GOARCH == "amd64" {
-			// Windows uses a different calling convention on amd64 from other
-			// operating systems so we need separate assembly files.
+		if goos == "windows" {
+			// Windows uses a different calling convention from other operating
+			// systems so we need separate assembly files.
 			suffix = "_windows"
 		}
-		asmGoarch := options.GOARCH
-		if options.GOARCH == "mips" || options.GOARCH == "mipsle" {
-			asmGoarch = "mipsx"
-		}
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/asm_"+asmGoarch+suffix+".S")
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/internal/task/task_stack_"+asmGoarch+suffix+".S")
+		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/asm_"+goarch+suffix+".S")
+		spec.ExtraFiles = append(spec.ExtraFiles, "src/internal/task/task_stack_"+goarch+suffix+".S")
 	}
-
-	// Configure the emulator.
-	if options.GOARCH != runtime.GOARCH {
+	if goarch != runtime.GOARCH {
 		// Some educated guesses as to how to invoke helper programs.
 		spec.GDB = []string{"gdb-multiarch"}
-		if options.GOOS == "linux" {
-			switch options.GOARCH {
+		if goos == "linux" {
+			switch goarch {
 			case "386":
 				// amd64 can _usually_ run 32-bit programs, so skip the emulator in that case.
 				if runtime.GOARCH != "amd64" {
@@ -552,19 +350,14 @@ func defaultTarget(options *Options) (*TargetSpec, error) {
 				spec.Emulator = "qemu-arm {}"
 			case "arm64":
 				spec.Emulator = "qemu-aarch64 {}"
-			case "mips":
-				spec.Emulator = "qemu-mips {}"
-			case "mipsle":
-				spec.Emulator = "qemu-mipsel {}"
 			}
 		}
 	}
-	if options.GOOS != runtime.GOOS {
-		if options.GOOS == "windows" {
+	if goos != runtime.GOOS {
+		if goos == "windows" {
 			spec.Emulator = "wine {}"
 		}
 	}
-
 	return &spec, nil
 }
 

compileopts/target_test.go

@@ -23,37 +23,6 @@ func TestLoadTarget(t *testing.T) {
 	}
 }
 
-func TestGetTargetSpecs_InheritableOnlyTargetsExcluded(t *testing.T) {
-	specs, err := GetTargetSpecs()
-	if err != nil {
-		t.Fatal("GetTargetSpecs failed:", err)
-	}
-
-	// Inheritable-only processor-level targets should not appear in the listing.
-	inheritableOnlyTargets := []string{"esp32", "esp32c3", "esp32s3", "esp8266", "rp2040", "rp2350", "rp2350b"}
-	for _, name := range inheritableOnlyTargets {
-		if _, ok := specs[name]; ok {
-			t.Errorf("inheritable-only target %q should not appear in GetTargetSpecs", name)
-		}
-	}
-
-	// Board targets that inherit from inheritable-only targets should still appear.
-	boardTargets := []string{"esp32-coreboard-v2", "pico"}
-	for _, name := range boardTargets {
-		if _, ok := specs[name]; !ok {
-			t.Errorf("board target %q should appear in GetTargetSpecs", name)
-		}
-	}
-}
-
-func TestLoadTarget_InheritableOnlyTargetStillLoadable(t *testing.T) {
-	// Inheritable-only targets should still be loadable directly (for building).
-	_, err := LoadTarget(&Options{Target: "esp32"})
-	if err != nil {
-		t.Errorf("LoadTarget should still load inheritable-only target esp32: %v", err)
-	}
-}
-
 func TestOverrideProperties(t *testing.T) {
 	baseAutoStackSize := true
 	base := &TargetSpec{
@@ -112,52 +81,3 @@ func TestOverrideProperties(t *testing.T) {
 	}
 
 }
-
-func TestConfigLinkerFlavor(t *testing.T) {
-	tests := []struct {
-		name   string
-		target *TargetSpec
-		goos   string
-		want   string
-	}{
-		{
-			name:   "default gnu",
-			target: &TargetSpec{},
-			goos:   "linux",
-			want:   "gnu",
-		},
-		{
-			name:   "default coff",
-			target: &TargetSpec{},
-			goos:   "windows",
-			want:   "coff",
-		},
-		{
-			name:   "default darwin",
-			target: &TargetSpec{},
-			goos:   "darwin",
-			want:   "darwin",
-		},
-		{
-			name: "target override",
-			target: &TargetSpec{
-				LinkerFlavor: "coff",
-			},
-			goos: "linux",
-			want: "coff",
-		},
-	}
-
-	for _, tc := range tests {
-		t.Run(tc.name, func(t *testing.T) {
-			tc.target.GOOS = tc.goos
-			config := &Config{
-				Options: &Options{},
-				Target:  tc.target,
-			}
-			if got := config.LinkerFlavor(); got != tc.want {
-				t.Fatalf("LinkerFlavor() = %q, want %q", got, tc.want)
-			}
-		})
-	}
-}

compileopts/triple_llvm22.go

@@ -1,12 +0,0 @@
-//go:build llvm22
-
-package compileopts
-
-import "strings"
-
-// ClangTriple returns the target triple to pass to Clang's --target flag.
-// LLVM 22 deprecated the "wasm32-unknown-wasi" triple in favor of
-// "wasm32-unknown-wasip1", so we substitute it here to avoid warnings.
-func ClangTriple(triple string) string {
-	return strings.Replace(triple, "wasm32-unknown-wasi", "wasm32-unknown-wasip1", 1)
-}

compileopts/triple_pre22.go

@@ -1,9 +0,0 @@
-//go:build !llvm22
-
-package compileopts
-
-// ClangTriple returns the target triple to pass to Clang's --target flag.
-// For pre-LLVM 22, the triple is used as-is.
-func ClangTriple(triple string) string {
-	return triple
-}

compiler/alias.go

@@ -16,18 +16,13 @@ import "tinygo.org/x/go-llvm"
 
 var stdlibAliases = map[string]string{
 	// crypto packages
-	"crypto/ed25519/internal/edwards25519/field.feMul": "crypto/ed25519/internal/edwards25519/field.feMulGeneric",
-	"crypto/internal/edwards25519/field.feSquare":      "crypto/ed25519/internal/edwards25519/field.feSquareGeneric",
-	"crypto/md5.block":           "crypto/md5.blockGeneric",
-	"crypto/sha1.block":          "crypto/sha1.blockGeneric",
-	"crypto/sha1.blockAMD64":     "crypto/sha1.blockGeneric",
-	"crypto/sha256.block":        "crypto/sha256.blockGeneric",
-	"crypto/sha512.blockAMD64":   "crypto/sha512.blockGeneric",
-	"internal/chacha8rand.block": "internal/chacha8rand.block_generic",
-
-	// AES
-	"crypto/aes.decryptBlockAsm": "crypto/aes.decryptBlock",
-	"crypto/aes.encryptBlockAsm": "crypto/aes.encryptBlock",
+	"crypto/ed25519/internal/edwards25519/field.feMul":    "crypto/ed25519/internal/edwards25519/field.feMulGeneric",
+	"crypto/ed25519/internal/edwards25519/field.feSquare": "crypto/ed25519/internal/edwards25519/field.feSquareGeneric",
+	"crypto/md5.block":         "crypto/md5.blockGeneric",
+	"crypto/sha1.block":        "crypto/sha1.blockGeneric",
+	"crypto/sha1.blockAMD64":   "crypto/sha1.blockGeneric",
+	"crypto/sha256.block":      "crypto/sha256.blockGeneric",
+	"crypto/sha512.blockAMD64": "crypto/sha512.blockGeneric",
 
 	// math package
 	"math.archHypot": "math.hypot",

compiler/asserts.go

@@ -99,7 +99,7 @@ func (b *builder) createUnsafeSliceStringCheck(name string, ptr, len llvm.Value,
 	// However, in practice, it is also necessary to check that the length is
 	// not too big that a GEP wouldn't be possible without wrapping the pointer.
 	// These two checks (non-negative and not too big) can be merged into one
-	// using an unsigned greater than.
+	// using an unsiged greater than.
 
 	// Make sure the len value is at least as big as a uintptr.
 	len = b.extendInteger(len, lenType, b.uintptrType)
@@ -135,7 +135,7 @@ func (b *builder) createChanBoundsCheck(elementSize uint64, bufSize llvm.Value,
 
 	// Calculate (^uintptr(0)) >> 1, which is the max value that fits in an
 	// uintptr if uintptrs were signed.
-	maxBufSize := b.CreateLShr(llvm.ConstNot(llvm.ConstInt(b.uintptrType, 0, false)), llvm.ConstInt(b.uintptrType, 1, false), "")
+	maxBufSize := llvm.ConstLShr(llvm.ConstNot(llvm.ConstInt(b.uintptrType, 0, false)), llvm.ConstInt(b.uintptrType, 1, false))
 	if elementSize > maxBufSize.ZExtValue() {
 		b.addError(pos, fmt.Sprintf("channel element type is too big (%v bytes)", elementSize))
 		return
@@ -150,7 +150,7 @@ func (b *builder) createChanBoundsCheck(elementSize uint64, bufSize llvm.Value,
 
 	// Make sure maxBufSize has the same type as bufSize.
 	if maxBufSize.Type() != bufSize.Type() {
-		maxBufSize = b.CreateZExt(maxBufSize, bufSize.Type(), "")
+		maxBufSize = llvm.ConstZExt(maxBufSize, bufSize.Type())
 	}
 
 	// Do the check for a too large (or negative) buffer size.
@@ -241,35 +241,22 @@ func (b *builder) createRuntimeAssert(assert llvm.Value, blockPrefix, assertFunc
 		}
 	}
 
-	faultBlock := b.getRuntimeAssertBlock(blockPrefix, assertFunc)
+	// Put the fault block at the end of the function and the next block at the
+	// current insert position.
+	faultBlock := b.ctx.AddBasicBlock(b.llvmFn, blockPrefix+".throw")
 	nextBlock := b.insertBasicBlock(blockPrefix + ".next")
-	b.currentBlockInfo.exit = nextBlock // adjust outgoing block for phi nodes
+	b.blockExits[b.currentBlock] = nextBlock // adjust outgoing block for phi nodes
 
 	// Now branch to the out-of-bounds or the regular block.
 	b.CreateCondBr(assert, faultBlock, nextBlock)
 
-	// Ok: assert didn't trigger so continue normally.
-	b.SetInsertPointAtEnd(nextBlock)
-}
-
-func (b *builder) getRuntimeAssertBlock(blockPrefix, assertFunc string) llvm.BasicBlock {
-	if b.runtimeAssertBlocks == nil {
-		b.runtimeAssertBlocks = make(map[string]llvm.BasicBlock)
-	}
-	if block := b.runtimeAssertBlocks[assertFunc]; !block.IsNil() {
-		return block
-	}
-	savedBlock := b.GetInsertBlock()
-	block := b.ctx.AddBasicBlock(b.llvmFn, blockPrefix+".throw")
-	b.runtimeAssertBlocks[assertFunc] = block
-	b.SetInsertPointAtEnd(block)
-	if b.hasDeferFrame() {
-		b.createFaultCheckpoint()
-	}
+	// Fail: the assert triggered so panic.
+	b.SetInsertPointAtEnd(faultBlock)
 	b.createRuntimeCall(assertFunc, nil, "")
 	b.CreateUnreachable()
-	b.SetInsertPointAtEnd(savedBlock)
-	return block
+
+	// Ok: assert didn't trigger so continue normally.
+	b.SetInsertPointAtEnd(nextBlock)
 }
 
 // extendInteger extends the value to at least targetType using a zero or sign

compiler/atomic.go

@@ -1,6 +1,9 @@
 package compiler
 
 import (
+	"fmt"
+	"strings"
+
 	"tinygo.org/x/go-llvm"
 )
 
@@ -10,42 +13,74 @@ import (
 func (b *builder) createAtomicOp(name string) llvm.Value {
 	switch name {
 	case "AddInt32", "AddInt64", "AddUint32", "AddUint64", "AddUintptr":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.getValue(b.fn.Params[1])
+		if strings.HasPrefix(b.Triple, "avr") {
+			// AtomicRMW does not work on AVR as intended:
+			// - There are some register allocation issues (fixed by https://reviews.llvm.org/D97127 which is not yet in a usable LLVM release)
+			// - The result is the new value instead of the old value
+			vType := val.Type()
+			name := fmt.Sprintf("__sync_fetch_and_add_%d", vType.IntTypeWidth()/8)
+			fn := b.mod.NamedFunction(name)
+			if fn.IsNil() {
+				fn = llvm.AddFunction(b.mod, name, llvm.FunctionType(vType, []llvm.Type{ptr.Type(), vType}, false))
+			}
+			oldVal := b.createCall(fn.GlobalValueType(), fn, []llvm.Value{ptr, val}, "")
+			// Return the new value, not the original value returned.
+			return b.CreateAdd(oldVal, val, "")
+		}
 		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAdd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
 		// Return the new value, not the original value returned by atomicrmw.
 		return b.CreateAdd(oldVal, val, "")
-	case "AndInt32", "AndInt64", "AndUint32", "AndUint64", "AndUintptr":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
-		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAnd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
-		return oldVal
-	case "OrInt32", "OrInt64", "OrUint32", "OrUint64", "OrUintptr":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
-		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpOr, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
-		return oldVal
 	case "SwapInt32", "SwapInt64", "SwapUint32", "SwapUint64", "SwapUintptr", "SwapPointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.getValue(b.fn.Params[1])
+		isPointer := val.Type().TypeKind() == llvm.PointerTypeKind
+		if isPointer {
+			// atomicrmw only supports integers, so cast to an integer.
+			// TODO: this is fixed in LLVM 15.
+			val = b.CreatePtrToInt(val, b.uintptrType, "")
+			ptr = b.CreateBitCast(ptr, llvm.PointerType(val.Type(), 0), "")
+		}
 		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpXchg, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
+		if isPointer {
+			oldVal = b.CreateIntToPtr(oldVal, b.i8ptrType, "")
+		}
 		return oldVal
 	case "CompareAndSwapInt32", "CompareAndSwapInt64", "CompareAndSwapUint32", "CompareAndSwapUint64", "CompareAndSwapUintptr", "CompareAndSwapPointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		old := b.getValue(b.fn.Params[1], getPos(b.fn))
-		newVal := b.getValue(b.fn.Params[2], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		old := b.getValue(b.fn.Params[1])
+		newVal := b.getValue(b.fn.Params[2])
 		tuple := b.CreateAtomicCmpXchg(ptr, old, newVal, llvm.AtomicOrderingSequentiallyConsistent, llvm.AtomicOrderingSequentiallyConsistent, true)
 		swapped := b.CreateExtractValue(tuple, 1, "")
 		return swapped
 	case "LoadInt32", "LoadInt64", "LoadUint32", "LoadUint64", "LoadUintptr", "LoadPointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
 		val := b.CreateLoad(b.getLLVMType(b.fn.Signature.Results().At(0).Type()), ptr, "")
 		val.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
 		val.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
 		return val
 	case "StoreInt32", "StoreInt64", "StoreUint32", "StoreUint64", "StoreUintptr", "StorePointer":
-		ptr := b.getValue(b.fn.Params[0], getPos(b.fn))
-		val := b.getValue(b.fn.Params[1], getPos(b.fn))
+		ptr := b.getValue(b.fn.Params[0])
+		val := b.getValue(b.fn.Params[1])
+		if strings.HasPrefix(b.Triple, "avr") {
+			// SelectionDAGBuilder is currently missing the "are unaligned atomics allowed" check for stores.
+			vType := val.Type()
+			isPointer := vType.TypeKind() == llvm.PointerTypeKind
+			if isPointer {
+				// libcalls only supports integers, so cast to an integer.
+				vType = b.uintptrType
+				val = b.CreatePtrToInt(val, vType, "")
+				ptr = b.CreateBitCast(ptr, llvm.PointerType(vType, 0), "")
+			}
+			name := fmt.Sprintf("__atomic_store_%d", vType.IntTypeWidth()/8)
+			fn := b.mod.NamedFunction(name)
+			if fn.IsNil() {
+				fn = llvm.AddFunction(b.mod, name, llvm.FunctionType(vType, []llvm.Type{ptr.Type(), vType, b.uintptrType}, false))
+			}
+			b.createCall(fn.GlobalValueType(), fn, []llvm.Value{ptr, val, llvm.ConstInt(b.uintptrType, 5, false)}, "")
+			return llvm.Value{}
+		}
 		store := b.CreateStore(val, ptr)
 		store.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
 		store.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required

compiler/calls.go

@@ -19,9 +19,8 @@ const maxFieldsPerParam = 3
 // useful while declaring or defining a function.
 type paramInfo struct {
 	llvmType llvm.Type
-	name     string     // name, possibly with suffixes for e.g. struct fields
-	elemSize uint64     // size of pointer element type, or 0 if this isn't a pointer
-	flags    paramFlags // extra flags for this parameter
+	name     string // name, possibly with suffixes for e.g. struct fields
+	elemSize uint64 // size of pointer element type, or 0 if this isn't a pointer
 }
 
 // paramFlags identifies parameter attributes for flags. Most importantly, it
@@ -29,30 +28,20 @@ type paramInfo struct {
 type paramFlags uint8
 
 const (
-	// Whether this is a full or partial Go parameter (int, slice, etc).
-	// The extra context parameter is not a Go parameter.
-	paramIsGoParam = 1 << iota
-
-	// Whether this is a readonly parameter (for example, a string pointer).
-	paramIsReadonly
-
-	// Whether this parameter is passed through backing storage.
-	paramIsIndirect
+	// Parameter may have the deferenceable_or_null attribute. This attribute
+	// cannot be applied to unsafe.Pointer and to the data pointer of slices.
+	paramIsDeferenceableOrNull = 1 << iota
 )
 
 // createRuntimeCallCommon creates a runtime call. Use createRuntimeCall or
 // createRuntimeInvoke instead.
 func (b *builder) createRuntimeCallCommon(fnName string, args []llvm.Value, name string, isInvoke bool) llvm.Value {
-	member := b.program.ImportedPackage("runtime").Members[fnName]
-	if member == nil {
-		panic("unknown runtime call: " + fnName)
-	}
-	fn := member.(*ssa.Function)
+	fn := b.program.ImportedPackage("runtime").Members[fnName].(*ssa.Function)
 	fnType, llvmFn := b.getFunction(fn)
 	if llvmFn.IsNil() {
 		panic("trying to call non-existent function: " + fn.RelString(nil))
 	}
-	args = append(args, llvm.Undef(b.dataPtrType)) // unused context parameter
+	args = append(args, llvm.Undef(b.i8ptrType)) // unused context parameter
 	if isInvoke {
 		return b.createInvoke(fnType, llvmFn, args, name)
 	}
@@ -82,15 +71,7 @@ func (b *builder) createCall(fnType llvm.Type, fn llvm.Value, args []llvm.Value,
 		fragments := b.expandFormalParam(arg)
 		expanded = append(expanded, fragments...)
 	}
-	call := b.CreateCall(fnType, fn, expanded, name)
-	if !fn.IsAFunction().IsNil() {
-		if cc := fn.FunctionCallConv(); cc != llvm.CCallConv {
-			// Set a different calling convention if needed.
-			// This is needed for GetModuleHandleExA on Windows, for example.
-			call.SetInstructionCallConv(cc)
-		}
-	}
-	return call
+	return b.CreateCall(fnType, fn, expanded, name)
 }
 
 // createInvoke is like createCall but continues execution at the landing pad if
@@ -105,18 +86,6 @@ func (b *builder) createInvoke(fnType llvm.Type, fn llvm.Value, args []llvm.Valu
 // Expand an argument type to a list that can be used in a function call
 // parameter list.
 func (c *compilerContext) expandFormalParamType(t llvm.Type, name string, goType types.Type) []paramInfo {
-	if c.isIndirectAggregate(t) {
-		return []paramInfo{{
-			llvmType: c.dataPtrType,
-			name:     name,
-			elemSize: c.targetData.TypeAllocSize(t),
-			flags:    paramIsGoParam | paramIsReadonly | paramIsIndirect,
-		}}
-	}
-	return c.expandDirectFormalParamType(t, name, goType)
-}
-
-func (c *compilerContext) expandDirectFormalParamType(t llvm.Type, name string, goType types.Type) []paramInfo {
 	switch t.TypeKind() {
 	case llvm.StructTypeKind:
 		fieldInfos := c.flattenAggregateType(t, name, goType)
@@ -130,38 +99,6 @@ func (c *compilerContext) expandDirectFormalParamType(t llvm.Type, name string,
 	return []paramInfo{c.getParamInfo(t, name, goType)}
 }
 
-func (c *compilerContext) storedParamType(t llvm.Type, exported bool) llvm.Type {
-	if c.isIndirectParam(t, exported) {
-		return c.dataPtrType
-	}
-	return t
-}
-
-func (c *compilerContext) isIndirectParam(t llvm.Type, exported bool) bool {
-	return !exported && c.isIndirectAggregate(t)
-}
-
-func (b *builder) appendStoredValueTypes(valueTypes []llvm.Type, values []ssa.Value, exported bool) []llvm.Type {
-	for _, value := range values {
-		valueTypes = append(valueTypes, b.storedParamType(b.getLLVMType(value.Type()), exported))
-	}
-	return valueTypes
-}
-
-func (b *builder) appendStoredParamTypes(valueTypes []llvm.Type, params []*types.Var, exported bool) []llvm.Type {
-	for _, param := range params {
-		valueTypes = append(valueTypes, b.storedParamType(b.getLLVMType(param.Type()), exported))
-	}
-	return valueTypes
-}
-
-func (b *builder) prependIndirectResult(sig *types.Signature, exported bool, params []llvm.Value, name string) []llvm.Value {
-	if resultType, indirect := b.hasIndirectResult(sig); !exported && indirect {
-		return append([]llvm.Value{b.createIndirectStorage(resultType, name)}, params...)
-	}
-	return params
-}
-
 // expandFormalParamOffsets returns a list of offsets from the start of an
 // object of type t after it would have been split up by expandFormalParam. This
 // is useful for debug information, where it is necessary to know the offset
@@ -217,7 +154,6 @@ func (c *compilerContext) flattenAggregateType(t llvm.Type, name string, goType
 				continue
 			}
 			suffix := strconv.Itoa(i)
-			isString := false
 			if goType != nil {
 				// Try to come up with a good suffix for this struct field,
 				// depending on which Go type it's based on.
@@ -234,16 +170,12 @@ func (c *compilerContext) flattenAggregateType(t llvm.Type, name string, goType
 						suffix = []string{"r", "i"}[i]
 					case types.String:
 						suffix = []string{"data", "len"}[i]
-						isString = true
 					}
 				case *types.Signature:
 					suffix = []string{"context", "funcptr"}[i]
 				}
 			}
 			subInfos := c.flattenAggregateType(subfield, name+"."+suffix, extractSubfield(goType, i))
-			if isString {
-				subInfos[0].flags |= paramIsReadonly
-			}
 			paramInfos = append(paramInfos, subInfos...)
 		}
 		return paramInfos
@@ -259,7 +191,6 @@ func (c *compilerContext) getParamInfo(t llvm.Type, name string, goType types.Ty
 	info := paramInfo{
 		llvmType: t,
 		name:     name,
-		flags:    paramIsGoParam,
 	}
 	if goType != nil {
 		switch underlying := goType.Underlying().(type) {
@@ -298,7 +229,7 @@ func extractSubfield(t types.Type, field int) types.Type {
 	}
 }
 
-// flattenAggregateTypeOffsets returns the offsets from the start of an object of
+// flattenAggregateTypeOffset returns the offsets from the start of an object of
 // type t if this object were flattened like in flattenAggregate. Used together
 // with flattenAggregate to know the start indices of each value in the
 // non-flattened object.

compiler/channel.go

@@ -4,9 +4,7 @@ package compiler
 // or pseudo-operations that are lowered during goroutine lowering.
 
 import (
-	"fmt"
 	"go/types"
-	"math"
 
 	"github.com/tinygo-org/tinygo/compiler/llvmutil"
 	"golang.org/x/tools/go/ssa"
@@ -16,7 +14,7 @@ import (
 func (b *builder) createMakeChan(expr *ssa.MakeChan) llvm.Value {
 	elementSize := b.targetData.TypeAllocSize(b.getLLVMType(expr.Type().Underlying().(*types.Chan).Elem()))
 	elementSizeValue := llvm.ConstInt(b.uintptrType, elementSize, false)
-	bufSize := b.getValue(expr.Size, getPos(expr))
+	bufSize := b.getValue(expr.Size)
 	b.createChanBoundsCheck(elementSize, bufSize, expr.Size.Type().Underlying().(*types.Basic), expr.Pos())
 	if bufSize.Type().IntTypeWidth() < b.uintptrType.IntTypeWidth() {
 		bufSize = b.CreateZExt(bufSize, b.uintptrType, "")
@@ -29,55 +27,81 @@ func (b *builder) createMakeChan(expr *ssa.MakeChan) llvm.Value {
 // createChanSend emits a pseudo chan send operation. It is lowered to the
 // actual channel send operation during goroutine lowering.
 func (b *builder) createChanSend(instr *ssa.Send) {
-	ch := b.getValue(instr.Chan, getPos(instr))
+	ch := b.getValue(instr.Chan)
+	chanValue := b.getValue(instr.X)
 
 	// store value-to-send
 	valueType := b.getLLVMType(instr.X.Type())
 	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var storage valueStorage
+	var valueAlloca, valueAllocaCast, valueAllocaSize llvm.Value
 	if isZeroSize {
-		storage.ptr = llvm.ConstNull(b.dataPtrType)
+		valueAlloca = llvm.ConstNull(llvm.PointerType(valueType, 0))
+		valueAllocaCast = llvm.ConstNull(b.i8ptrType)
 	} else {
-		storage = b.getValueStorage(instr.X, "chan.value")
+		valueAlloca, valueAllocaCast, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
+		b.CreateStore(chanValue, valueAlloca)
 	}
 
-	// Allocate buffer for the channel operation.
-	channelOp := b.getLLVMRuntimeType("channelOp")
-	channelOpAlloca, channelOpAllocaSize := b.createTemporaryAlloca(channelOp, "chan.op")
+	// Allocate blockedlist buffer.
+	channelBlockedList := b.getLLVMRuntimeType("channelBlockedList")
+	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")
 
 	// Do the send.
-	b.createRuntimeInvoke("chanSend", []llvm.Value{ch, storage.ptr, channelOpAlloca}, "")
+	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")
 
 	// End the lifetime of the allocas.
 	// This also works around a bug in CoroSplit, at least in LLVM 8:
 	// https://bugs.llvm.org/show_bug.cgi?id=41742
-	b.emitLifetimeEnd(channelOpAlloca, channelOpAllocaSize)
-	b.endValueStorage(storage)
+	b.emitLifetimeEnd(channelBlockedListAllocaCast, channelBlockedListAllocaSize)
+	if !isZeroSize {
+		b.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)
+	}
 }
 
 // createChanRecv emits a pseudo chan receive operation. It is lowered to the
 // actual channel receive operation during goroutine lowering.
 func (b *builder) createChanRecv(unop *ssa.UnOp) llvm.Value {
 	valueType := b.getLLVMType(unop.X.Type().Underlying().(*types.Chan).Elem())
-	ch := b.getValue(unop.X, getPos(unop))
+	ch := b.getValue(unop.X)
 
 	// Allocate memory to receive into.
-	result := b.createRuntimeValueResult(valueType, unop.CommaOk, true, "chan")
+	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
+	var valueAlloca, valueAllocaCast, valueAllocaSize llvm.Value
+	if isZeroSize {
+		valueAlloca = llvm.ConstNull(llvm.PointerType(valueType, 0))
+		valueAllocaCast = llvm.ConstNull(b.i8ptrType)
+	} else {
+		valueAlloca, valueAllocaCast, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
+	}
 
-	// Allocate buffer for the channel operation.
-	channelOp := b.getLLVMRuntimeType("channelOp")
-	channelOpAlloca, channelOpAllocaSize := b.createTemporaryAlloca(channelOp, "chan.op")
+	// Allocate blockedlist buffer.
+	channelBlockedList := b.getLLVMRuntimeType("channelBlockedList")
+	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")
 
 	// Do the receive.
-	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, result.valuePtr, channelOpAlloca}, "")
-	received := result.finish(b, commaOk, "chan.received")
-	b.emitLifetimeEnd(channelOpAlloca, channelOpAllocaSize)
-	return received
+	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")
+	var received llvm.Value
+	if isZeroSize {
+		received = llvm.ConstNull(valueType)
+	} else {
+		received = b.CreateLoad(valueType, valueAlloca, "chan.received")
+		b.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)
+	}
+	b.emitLifetimeEnd(channelBlockedListAllocaCast, channelBlockedListAllocaSize)
+
+	if unop.CommaOk {
+		tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{valueType, b.ctx.Int1Type()}, false))
+		tuple = b.CreateInsertValue(tuple, received, 0, "")
+		tuple = b.CreateInsertValue(tuple, commaOk, 1, "")
+		return tuple
+	} else {
+		return received
+	}
 }
 
 // createChanClose closes the given channel.
 func (b *builder) createChanClose(ch llvm.Value) {
-	b.createRuntimeInvoke("chanClose", []llvm.Value{ch}, "")
+	b.createRuntimeCall("chanClose", []llvm.Value{ch}, "")
 }
 
 // createSelect emits all IR necessary for a select statements. That's a
@@ -102,20 +126,6 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		}
 	}
 
-	const maxSelectStates = math.MaxUint32 >> 2
-	if len(expr.States) > maxSelectStates {
-		// The runtime code assumes that the number of state must fit in 30 bits
-		// (so the select index can be stored in a uint32 with two bits reserved
-		// for other purposes). It seems unlikely that a real program would have
-		// that many states, but we check for this case anyway to be sure.
-		// We use a uint32 (and not a uintptr or uint64) to avoid 64-bit atomic
-		// operations which aren't available everywhere.
-		b.addError(expr.Pos(), fmt.Sprintf("too many select states: got %d but the maximum supported number is %d", len(expr.States), maxSelectStates))
-
-		// Continue as usual (we'll generate broken code but the error will
-		// prevent the compilation to complete).
-	}
-
 	// This code create a (stack-allocated) slice containing all the select
 	// cases and then calls runtime.chanSelect to perform the actual select
 	// statement.
@@ -130,7 +140,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	var selectStates []llvm.Value
 	chanSelectStateType := b.getLLVMRuntimeType("chanSelectState")
 	for _, state := range expr.States {
-		ch := b.getValue(state.Chan, state.Pos)
+		ch := b.getValue(state.Chan)
 		selectState := llvm.ConstNull(chanSelectStateType)
 		selectState = b.CreateInsertValue(selectState, ch, 0, "")
 		switch state.Dir {
@@ -146,8 +156,11 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		case types.SendOnly:
 			// Store this value in an alloca and put a pointer to this alloca
 			// in the send state.
-			alloca := b.getSelectSendStorage(state.Send)
-			selectState = b.CreateInsertValue(selectState, alloca, 1, "")
+			sendValue := b.getValue(state.Send)
+			alloca := llvmutil.CreateEntryBlockAlloca(b.Builder, sendValue.Type(), "select.send.value")
+			b.CreateStore(sendValue, alloca)
+			ptr := b.CreateBitCast(alloca, b.i8ptrType, "")
+			selectState = b.CreateInsertValue(selectState, ptr, 1, "")
 		default:
 			panic("unreachable")
 		}
@@ -155,10 +168,10 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	}
 
 	// Create a receive buffer, where the received value will be stored.
-	recvbuf := llvm.Undef(b.dataPtrType)
+	recvbuf := llvm.Undef(b.i8ptrType)
 	if recvbufSize != 0 {
 		allocaType := llvm.ArrayType(b.ctx.Int8Type(), int(recvbufSize))
-		recvbufAlloca, _ := b.createTemporaryAlloca(allocaType, "select.recvbuf.alloca")
+		recvbufAlloca, _, _ := b.createTemporaryAlloca(allocaType, "select.recvbuf.alloca")
 		recvbufAlloca.SetAlignment(recvbufAlign)
 		recvbuf = b.CreateGEP(allocaType, recvbufAlloca, []llvm.Value{
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
@@ -168,7 +181,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 
 	// Create the states slice (allocated on the stack).
 	statesAllocaType := llvm.ArrayType(chanSelectStateType, len(selectStates))
-	statesAlloca, statesSize := b.createTemporaryAlloca(statesAllocaType, "select.states.alloca")
+	statesAlloca, statesI8, statesSize := b.createTemporaryAlloca(statesAllocaType, "select.states.alloca")
 	for i, state := range selectStates {
 		// Set each slice element to the appropriate channel.
 		gep := b.CreateGEP(statesAllocaType, statesAlloca, []llvm.Value{
@@ -188,10 +201,10 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	if expr.Blocking {
 		// Stack-allocate operation structures.
 		// If these were simply created as a slice, they would heap-allocate.
-		opsAllocaType := llvm.ArrayType(b.getLLVMRuntimeType("channelOp"), len(selectStates))
-		opsAlloca, opsSize := b.createTemporaryAlloca(opsAllocaType, "select.block.alloca")
-		opsLen := llvm.ConstInt(b.uintptrType, uint64(len(selectStates)), false)
-		opsPtr := b.CreateGEP(opsAllocaType, opsAlloca, []llvm.Value{
+		chBlockAllocaType := llvm.ArrayType(b.getLLVMRuntimeType("channelBlockedList"), len(selectStates))
+		chBlockAlloca, chBlockAllocaPtr, chBlockSize := b.createTemporaryAlloca(chBlockAllocaType, "select.block.alloca")
+		chBlockLen := llvm.ConstInt(b.uintptrType, uint64(len(selectStates)), false)
+		chBlockPtr := b.CreateGEP(chBlockAllocaType, chBlockAlloca, []llvm.Value{
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 			llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		}, "select.block")
@@ -199,23 +212,20 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		results = b.createRuntimeCall("chanSelect", []llvm.Value{
 			recvbuf,
 			statesPtr, statesLen, statesLen, // []chanSelectState
-			opsPtr, opsLen, opsLen, // []channelOp
+			chBlockPtr, chBlockLen, chBlockLen, // []channelBlockList
 		}, "select.result")
 
 		// Terminate the lifetime of the operation structures.
-		b.emitLifetimeEnd(opsAlloca, opsSize)
+		b.emitLifetimeEnd(chBlockAllocaPtr, chBlockSize)
 	} else {
-		opsPtr := llvm.ConstNull(b.dataPtrType)
-		opsLen := llvm.ConstInt(b.uintptrType, 0, false)
-		results = b.createRuntimeCall("chanSelect", []llvm.Value{
+		results = b.createRuntimeCall("tryChanSelect", []llvm.Value{
 			recvbuf,
 			statesPtr, statesLen, statesLen, // []chanSelectState
-			opsPtr, opsLen, opsLen, // []channelOp (nil slice)
 		}, "select.result")
 	}
 
 	// Terminate the lifetime of the states alloca.
-	b.emitLifetimeEnd(statesAlloca, statesSize)
+	b.emitLifetimeEnd(statesI8, statesSize)
 
 	// The result value does not include all the possible received values,
 	// because we can't load them in advance. Instead, the *ssa.Extract
@@ -237,7 +247,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 	if expr.Index == 0 {
 		// index
-		value := b.getValue(expr.Tuple, getPos(expr))
+		value := b.getValue(expr.Tuple)
 		index := b.CreateExtractValue(value, expr.Index, "")
 		if index.Type().IntTypeWidth() < b.intType.IntTypeWidth() {
 			index = b.CreateSExt(index, b.intType, "")
@@ -245,7 +255,7 @@ func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 		return index
 	} else if expr.Index == 1 {
 		// comma-ok
-		value := b.getValue(expr.Tuple, getPos(expr))
+		value := b.getValue(expr.Tuple)
 		return b.CreateExtractValue(value, expr.Index, "")
 	} else {
 		// Select statements are (index, ok, ...) where ... is a number of
@@ -254,17 +264,8 @@ func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 		// receive can proceed at a time) so we'll get that alloca, bitcast
 		// it to the correct type, and dereference it.
 		recvbuf := b.selectRecvBuf[expr.Tuple.(*ssa.Select)]
-		return b.loadFromStorage(recvbuf, expr.Type(), "select.received")
+		typ := b.getLLVMType(expr.Type())
+		ptr := b.CreateBitCast(recvbuf, llvm.PointerType(typ, 0), "")
+		return b.CreateLoad(typ, ptr, "")
 	}
 }
-
-func (b *builder) getSelectSendStorage(value ssa.Value) llvm.Value {
-	typ := b.getLLVMType(value.Type())
-	if b.isIndirectAggregate(typ) {
-		return b.getValuePointer(value)
-	}
-	llvmValue := b.getValue(value, getPos(value))
-	ptr := llvmutil.CreateEntryBlockAlloca(b.Builder, typ, "select.send.value")
-	b.CreateStore(llvmValue, ptr)
-	return ptr
-}

compiler/compiler_test.go

@@ -4,7 +4,6 @@ import (
 	"flag"
 	"go/types"
 	"os"
-	"regexp"
 	"strconv"
 	"strings"
 	"testing"
@@ -30,7 +29,7 @@ func TestCompiler(t *testing.T) {
 	t.Parallel()
 
 	// Determine Go minor version (e.g. 16 in go1.16.3).
-	_, goMinor, err := goenv.GetGorootVersion()
+	_, goMinor, err := goenv.GetGorootVersion(goenv.Get("GOROOT"))
 	if err != nil {
 		t.Fatal("could not read Go version:", err)
 	}
@@ -50,19 +49,10 @@ func TestCompiler(t *testing.T) {
 		{"goroutine.go", "cortex-m-qemu", "tasks"},
 		{"channel.go", "", ""},
 		{"gc.go", "", ""},
-		{"zeromap.go", "", ""},
-		{"generics.go", "", ""},
-		{"large.go", "", ""},
 	}
 	if goMinor >= 20 {
 		tests = append(tests, testCase{"go1.20.go", "", ""})
 	}
-	if goMinor >= 21 {
-		tests = append(tests, testCase{"go1.21.go", "", ""})
-	}
-	if goMinor >= 27 {
-		tests = append(tests, testCase{"go1.27.go", "", ""})
-	}
 
 	for _, tc := range tests {
 		name := tc.file
@@ -79,11 +69,52 @@ func TestCompiler(t *testing.T) {
 			options := &compileopts.Options{
 				Target: targetString,
 			}
+			target, err := compileopts.LoadTarget(options)
+			if err != nil {
+				t.Fatal("failed to load target:", err)
+			}
 			if tc.scheduler != "" {
 				options.Scheduler = tc.scheduler
 			}
+			config := &compileopts.Config{
+				Options: options,
+				Target:  target,
+			}
+			compilerConfig := &Config{
+				Triple:             config.Triple(),
+				Features:           config.Features(),
+				ABI:                config.ABI(),
+				GOOS:               config.GOOS(),
+				GOARCH:             config.GOARCH(),
+				CodeModel:          config.CodeModel(),
+				RelocationModel:    config.RelocationModel(),
+				Scheduler:          config.Scheduler(),
+				AutomaticStackSize: config.AutomaticStackSize(),
+				DefaultStackSize:   config.StackSize(),
+				NeedsStackObjects:  config.NeedsStackObjects(),
+			}
+			machine, err := NewTargetMachine(compilerConfig)
+			if err != nil {
+				t.Fatal("failed to create target machine:", err)
+			}
+			defer machine.Dispose()
 
-			mod, errs := testCompilePackage(t, options, tc.file)
+			// Load entire program AST into memory.
+			lprogram, err := loader.Load(config, "./testdata/"+tc.file, config.ClangHeaders, types.Config{
+				Sizes: Sizes(machine),
+			})
+			if err != nil {
+				t.Fatal("failed to create target machine:", err)
+			}
+			err = lprogram.Parse()
+			if err != nil {
+				t.Fatalf("could not parse test case %s: %s", tc.file, err)
+			}
+
+			// Compile AST to IR.
+			program := lprogram.LoadSSA()
+			pkg := lprogram.MainPkg()
+			mod, errs := CompilePackage(tc.file, pkg, program.Package(pkg.Pkg), machine, compilerConfig, false)
 			if errs != nil {
 				for _, err := range errs {
 					t.Error(err)
@@ -91,18 +122,20 @@ func TestCompiler(t *testing.T) {
 				return
 			}
 
-			err := llvm.VerifyModule(mod, llvm.PrintMessageAction)
+			err = llvm.VerifyModule(mod, llvm.PrintMessageAction)
 			if err != nil {
 				t.Error(err)
 			}
 
 			// Optimize IR a little.
-			passOptions := llvm.NewPassBuilderOptions()
-			defer passOptions.Dispose()
-			err = mod.RunPasses("instcombine", llvm.TargetMachine{}, passOptions)
-			if err != nil {
-				t.Error(err)
+			funcPasses := llvm.NewFunctionPassManagerForModule(mod)
+			defer funcPasses.Dispose()
+			funcPasses.AddInstructionCombiningPass()
+			funcPasses.InitializeFunc()
+			for fn := mod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
+				funcPasses.RunFunc(fn)
 			}
+			funcPasses.FinalizeFunc()
 
 			outFilePrefix := tc.file[:len(tc.file)-3]
 			if tc.target != "" {
@@ -127,138 +160,30 @@ func TestCompiler(t *testing.T) {
 				t.Fatal("failed to read golden file:", err)
 			}
 
-			if diff := diffIR(string(expected), mod.String()); diff != "" {
-				t.Errorf("output does not match expected output (re-run with -update to regenerate):\n%s", diff)
+			if !fuzzyEqualIR(mod.String(), string(expected)) {
+				t.Errorf("output does not match expected output:\n%s", mod.String())
 			}
 		})
 	}
 }
 
-func TestOptimizedLargeAggregateABI(t *testing.T) {
-	options := &compileopts.Options{Target: "wasm"}
-	mod, errs := testCompilePackage(t, options, "large-optimized.go")
-	if len(errs) != 0 {
-		for _, err := range errs {
-			t.Error(err)
-		}
-		return
+// fuzzyEqualIR returns true if the two LLVM IR strings passed in are roughly
+// equal. That means, only relevant lines are compared (excluding comments
+// etc.).
+func fuzzyEqualIR(s1, s2 string) bool {
+	lines1 := filterIrrelevantIRLines(strings.Split(s1, "\n"))
+	lines2 := filterIrrelevantIRLines(strings.Split(s2, "\n"))
+	if len(lines1) != len(lines2) {
+		return false
 	}
-	defer mod.Dispose()
-
-	passOptions := llvm.NewPassBuilderOptions()
-	defer passOptions.Dispose()
-	if err := mod.RunPasses("default<O2>", llvm.TargetMachine{}, passOptions); err != nil {
-		t.Fatal(err)
-	}
-
-	resultFn := mod.NamedFunction("main.makeLargeOptimizedValue")
-	if resultFn.IsNil() {
-		t.Fatal("missing function main.makeLargeOptimizedValue")
-	}
-	if resultType := resultFn.GlobalValueType().ReturnType(); resultType.TypeKind() != llvm.VoidTypeKind {
-		t.Errorf("large aggregate result was promoted to %s", resultType)
-	}
-
-	for _, name := range []string{
-		"main.makeLargeOptimizedValue",
-		"main.readLargeOptimizedValue",
-		"main.readMixedLargeOptimizedValue",
-	} {
-		fn := mod.NamedFunction(name)
-		if fn.IsNil() {
-			t.Fatalf("missing function %s", name)
-		}
-		if paramType := fn.GlobalValueType().ParamTypes()[0]; paramType.TypeKind() != llvm.PointerTypeKind {
-			t.Errorf("%s aggregate parameter was promoted to %s", name, paramType)
+	for i, line1 := range lines1 {
+		line2 := lines2[i]
+		if line1 != line2 {
+			return false
 		}
 	}
-}
 
-// normalizeIR canonicalizes LLVM IR so a single golden file keeps matching
-// across LLVM versions. Golden files are written against LLVM <21; newer LLVM
-// prints some attributes differently.
-func normalizeIR(s string) string {
-	// Golden files are written using the pre-LLVM21 'nocapture' spelling,
-	// which LLVM printed before any co-occurring attribute such as
-	// 'readonly' (e.g. "ptr nocapture readonly"). LLVM 21+ prints the
-	// equivalent 'captures(none)' instead, and after such attributes (e.g.
-	// "ptr readonly captures(none)"). Normalize both name and position back
-	// to the old spelling.
-	s = normalizeCapturesAttr(s)
-
-	// LLVM 21+ also added an explicit 'nocreateundeforpoison' attribute to
-	// certain intrinsic declarations (e.g. llvm.umin) that were implicitly
-	// assumed not to create undef/poison before. It's unrelated to the
-	// behavior under test, so ignore it for comparison.
-	s = strings.ReplaceAll(s, "nocreateundeforpoison ", "")
-
-	// LLVM 22 dropped the (redundant) i64 size argument from
-	// llvm.lifetime.start/end. Normalize away that argument so golden files
-	// written against the two-argument form still match.
-	s = lifetimeSizeArgRe.ReplaceAllString(s, "$1")
-
-	return s
-}
-
-// diffIR compares two LLVM IR strings, ignoring irrelevant lines (comments,
-// empty lines, etc.) and normalizing LLVM-version-specific spellings via
-// normalizeIR. It returns "" when they are equal. Otherwise it returns a
-// compact diff of only the region that differs: the common prefix and suffix
-// are trimmed, then the differing expected lines (prefixed "-") are shown
-// followed by the differing actual lines (prefixed "+").
-func diffIR(expected, actual string) string {
-	exp := filterIrrelevantIRLines(strings.Split(normalizeIR(expected), "\n"))
-	act := filterIrrelevantIRLines(strings.Split(normalizeIR(actual), "\n"))
-
-	// Trim the common prefix.
-	start := 0
-	for start < len(exp) && start < len(act) && exp[start] == act[start] {
-		start++
-	}
-	// Trim the common suffix.
-	e, a := len(exp), len(act)
-	for e > start && a > start && exp[e-1] == act[a-1] {
-		e--
-		a--
-	}
-	if start == e && start == a {
-		return "" // equal
-	}
-
-	var b strings.Builder
-	b.WriteString("first difference at relevant line ")
-	b.WriteString(strconv.Itoa(start + 1))
-	b.WriteString(":\n")
-	for _, line := range exp[start:e] {
-		b.WriteString("- ")
-		b.WriteString(line)
-		b.WriteByte('\n')
-	}
-	for _, line := range act[start:a] {
-		b.WriteString("+ ")
-		b.WriteString(line)
-		b.WriteByte('\n')
-	}
-	return b.String()
-}
-
-// capturesNoneAttrRe matches a co-occurring attribute directly followed by
-// 'captures(none)', which is how LLVM 21+ orders these two attributes when
-// printing IR (the pre-LLVM21 'nocapture' attribute printed the other way
-// around).
-var capturesNoneAttrRe = regexp.MustCompile(`\b(readonly|readnone|writeonly|nonnull)\s+captures\(none\)`)
-
-// lifetimeSizeArgRe matches the i64 size argument of an
-// llvm.lifetime.start/end call or declaration, which LLVM 22 removed.
-var lifetimeSizeArgRe = regexp.MustCompile(`(@llvm\.lifetime\.(?:start|end)\.p0\()i64(?: immarg| \d+), `)
-
-// normalizeCapturesAttr rewrites LLVM 21+'s 'captures(none)' attribute back
-// to the pre-LLVM21 'nocapture' spelling and position, so golden IR files
-// written against LLVM <21 keep matching.
-func normalizeCapturesAttr(s string) string {
-	s = capturesNoneAttrRe.ReplaceAllString(s, "nocapture $1")
-	s = strings.ReplaceAll(s, "captures(none)", "nocapture")
-	return s
+	return true
 }
 
 // filterIrrelevantIRLines removes lines from the input slice of strings that
@@ -281,138 +206,12 @@ func filterIrrelevantIRLines(lines []string) []string {
 		if strings.HasPrefix(line, "source_filename = ") {
 			continue
 		}
-		if llvmVersion < 15 && strings.HasPrefix(line, "target datalayout = ") {
+		if llvmVersion < 14 && strings.HasPrefix(line, "target datalayout = ") {
 			// The datalayout string may vary betewen LLVM versions.
-			// Right now test outputs are for LLVM 15 and higher.
+			// Right now test outputs are for LLVM 14 and higher.
 			continue
 		}
 		out = append(out, line)
 	}
 	return out
 }
-
-func TestCompilerErrors(t *testing.T) {
-	t.Parallel()
-
-	// Read expected errors from the test file.
-	var expectedErrors []string
-	errorsFile, err := os.ReadFile("testdata/errors.go")
-	if err != nil {
-		t.Error(err)
-	}
-	errorsFileString := strings.ReplaceAll(string(errorsFile), "\r\n", "\n")
-	for line := range strings.SplitSeq(errorsFileString, "\n") {
-		if after, ok := strings.CutPrefix(line, "// ERROR: "); ok {
-			expectedErrors = append(expectedErrors, after)
-		}
-	}
-
-	// Compile the Go file with errors.
-	options := &compileopts.Options{
-		Target: "wasm",
-	}
-	_, errs := testCompilePackage(t, options, "errors.go")
-
-	// Check whether the actual errors match the expected errors.
-	expectedErrorsIdx := 0
-	for _, err := range errs {
-		err := err.(types.Error)
-		position := err.Fset.Position(err.Pos)
-		position.Filename = "errors.go" // don't use a full path
-		if expectedErrorsIdx >= len(expectedErrors) || expectedErrors[expectedErrorsIdx] != err.Msg {
-			t.Errorf("unexpected compiler error: %s: %s", position.String(), err.Msg)
-			continue
-		}
-		expectedErrorsIdx++
-	}
-}
-
-func TestAggregateValueCount(t *testing.T) {
-	t.Parallel()
-
-	ctx := llvm.NewContext()
-	defer ctx.Dispose()
-
-	byteType := ctx.Int8Type()
-	tests := []struct {
-		name     string
-		typ      llvm.Type
-		count    uint64
-		exceeded bool
-	}{
-		{"empty", llvm.ArrayType(byteType, 0), 0, false},
-		{"limit", llvm.ArrayType(byteType, 1024), 1024, false},
-		{"over limit", llvm.ArrayType(byteType, 1025), 0, true},
-		{"combined limit", ctx.StructType([]llvm.Type{
-			llvm.ArrayType(byteType, 512),
-			llvm.ArrayType(byteType, 512),
-		}, false), 1024, false},
-		{"combined over limit", ctx.StructType([]llvm.Type{
-			llvm.ArrayType(byteType, 1000),
-			llvm.ArrayType(byteType, 1000),
-		}, false), 0, true},
-		{"comma-ok over limit", ctx.StructType([]llvm.Type{
-			llvm.ArrayType(byteType, 1024),
-			ctx.Int1Type(),
-		}, false), 0, true},
-	}
-
-	for _, test := range tests {
-		t.Run(test.name, func(t *testing.T) {
-			count, exceeded := aggregateValueCount(test.typ, 0)
-			if exceeded != test.exceeded {
-				t.Errorf("expected exceeded=%t, got %t", test.exceeded, exceeded)
-			}
-			if !exceeded && count != test.count {
-				t.Errorf("expected count=%d, got %d", test.count, count)
-			}
-		})
-	}
-}
-
-// Build a package given a number of compiler options and a file.
-func testCompilePackage(t *testing.T, options *compileopts.Options, file string) (llvm.Module, []error) {
-	target, err := compileopts.LoadTarget(options)
-	if err != nil {
-		t.Fatal("failed to load target:", err)
-	}
-	config := &compileopts.Config{
-		Options: options,
-		Target:  target,
-	}
-	compilerConfig := &Config{
-		Triple:             config.Triple(),
-		Features:           config.Features(),
-		ABI:                config.ABI(),
-		GOOS:               config.GOOS(),
-		GOARCH:             config.GOARCH(),
-		CodeModel:          config.CodeModel(),
-		RelocationModel:    config.RelocationModel(),
-		Scheduler:          config.Scheduler(),
-		AutomaticStackSize: config.AutomaticStackSize(),
-		DefaultStackSize:   config.StackSize(),
-		NeedsStackObjects:  config.NeedsStackObjects(),
-	}
-	machine, err := NewTargetMachine(compilerConfig)
-	if err != nil {
-		t.Fatal("failed to create target machine:", err)
-	}
-	defer machine.Dispose()
-
-	// Load entire program AST into memory.
-	lprogram, err := loader.Load(config, "./testdata/"+file, types.Config{
-		Sizes: Sizes(machine),
-	})
-	if err != nil {
-		t.Fatal("failed to create target machine:", err)
-	}
-	err = lprogram.Parse()
-	if err != nil {
-		t.Fatalf("could not parse test case %s: %s", file, err)
-	}
-
-	// Compile AST to IR.
-	program := lprogram.LoadSSA()
-	pkg := lprogram.MainPkg()
-	return CompilePackage(file, pkg, program.Package(pkg.Pkg), machine, compilerConfig, false)
-}