avr: use precise GC by default

AVR is especially sensitive to false positives in the GC for a few reasons: * Pointer values are only two bytes, instead of four on most other microcontrollers. * Pointers are not aligned, so any two-byte value in an object coud be a pointer. * Memory typically starts at a low address, which makes it much more likely to clash with a regular integer value (which tend to be small values). Therefore, use the precise GC (instead of the conservative GC) by default. This increases binary size by around 350 bytes, but I think it's a good tradeoff in most cases: it avoids some runtime errors and generally RAM tends to be a lot more scarce than flash on AVR chips. If this is too much, `-gc=conservative` or `-gc=leaking` can be used instead.
ci: switch to Go 1.22
2026-08-03 02:27:48 +00:00 · 2024-02-25 15:18:05 +01:00 · 2024-02-20 21:58:09 +01:00 · 2024-02-20 21:00:22 +01:00 · 2024-02-19 23:29:44 +01:00 · 2024-02-19 22:17:19 +01:00
527 changed files with 17155 additions and 8353 deletions
@@ -5,17 +5,17 @@ commands:
    steps:
      - run:
          name: "Pull submodules"
-          command: git submodule update --init
+          command: git submodule update --init --recursive
  llvm-source-linux:
    steps:
      - restore_cache:
          keys:
-            - llvm-source-14-v3
+            - llvm-source-17-v1
      - run:
          name: "Fetch LLVM source"
          command: make llvm-source
      - save_cache:
-          key: llvm-source-14-v3
+          key: llvm-source-17-v1
          paths:
            - llvm-project/clang/lib/Headers
            - llvm-project/clang/include
@@ -55,7 +55,7 @@ commands:
      - 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
+            echo 'deb https://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-<<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 \
@@ -69,16 +69,16 @@ commands:
      - build-binaryen-linux
      - restore_cache:
          keys:
-            - go-cache-v3-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
-            - go-cache-v3-{{ checksum "go.mod" }}
+            - go-cache-v4-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
+            - go-cache-v4-{{ checksum "go.mod" }}
      - llvm-source-linux
      - run: go install -tags=llvm<<parameters.llvm>> .
      - restore_cache:
          keys:
-            - wasi-libc-sysroot-systemclang-v6
+            - wasi-libc-sysroot-systemclang-v7
      - run: make wasi-libc
      - save_cache:
-          key: wasi-libc-sysroot-systemclang-v6
+          key: wasi-libc-sysroot-systemclang-v7
          paths:
            - lib/wasi-libc/sysroot
      - when:
@@ -92,18 +92,25 @@ commands:
      - run: make gen-device -j4
      - run: make smoketest XTENSA=0
      - save_cache:
-          key: go-cache-v3-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
+          key: go-cache-v4-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
          paths:
            - ~/.cache/go-build
            - /go/pkg/mod

 jobs:
-  test-llvm14-go118:
+  test-llvm15-go118:
    docker:
-      - image: golang:1.18-buster
+      - image: golang:1.18-bullseye
    steps:
      - test-linux:
-          llvm: "14"
+          llvm: "15"
+    resource_class: large
+  test-llvm17-go122:
+    docker:
+      - image: golang:1.22-bullseye
+    steps:
+      - test-linux:
+          llvm: "17"
    resource_class: large

 workflows:
@@ -111,4 +118,6 @@ workflows:
    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-go118
+      # This tests LLVM 17 support when linking against system libraries.
+      - test-llvm17-go122
@@ -14,26 +14,36 @@ concurrency:
 jobs:
  build-macos:
    name: build-macos
-    runs-on: macos-11
+    strategy:
+      matrix:
+        # macos-12: amd64 (oldest supported version as of 05-02-2024)
+        # macos-14: arm64 (oldest arm64 version)
+        os: [macos-12, macos-14]
+        include:
+          - os: macos-12
+            goarch: amd64
+          - os: macos-14
+            goarch: arm64
+    runs-on: ${{ matrix.os }}
    steps:
      - name: Install Dependencies
        shell: bash
        run: |
          HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
        with:
          submodules: true
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-source
        with:
-          key: llvm-source-15-macos-v3
+          key: llvm-source-17-${{ matrix.os }}-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -44,7 +54,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -55,10 +65,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-build
        with:
-          key: llvm-build-15-macos-v4
+          key: llvm-build-17-${{ matrix.os }}-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -73,16 +83,16 @@ jobs:
          make llvm-build
          find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
      - name: Save LLVM build cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
      - name: Cache wasi-libc sysroot
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: cache-wasi-libc
        with:
-          key: wasi-libc-sysroot-v4
+          key: wasi-libc-sysroot-${{ matrix.os }}-v1
          path: lib/wasi-libc/sysroot
      - name: Build wasi-libc
        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
@@ -98,7 +108,7 @@ jobs:
        run: make tinygo-test
      - name: Make release artifact
        shell: bash
-        run: cp -p build/release.tar.gz build/tinygo.darwin-amd64.tar.gz 
+        run: cp -p build/release.tar.gz build/tinygo.darwin-${{ matrix.goarch }}.tar.gz
      - name: Publish release artifact
        # Note: this release artifact is double-zipped, see:
        # https://github.com/actions/upload-artifact/issues/39
@@ -106,29 +116,44 @@ jobs:
        # - have a double-zipped artifact when downloaded from the UI
        # - have a very slow artifact upload
        # We're doing the former here, to keep artifact uploads fast.
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
        with:
-          name: release-double-zipped
-          path: build/tinygo.darwin-amd64.tar.gz
+          name: darwin-${{ matrix.goarch }}-double-zipped
+          path: build/tinygo.darwin-${{ matrix.goarch }}.tar.gz
      - name: Smoke tests
        shell: bash
        run: make smoketest TINYGO=$(PWD)/build/tinygo
  test-macos-homebrew:
    name: homebrew-install
    runs-on: macos-latest
+    strategy:
+      matrix:
+        version: [16, 17]
    steps:
-      - name: Install LLVM
-        shell: bash
+      - name: Set up Homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+      - name: Fix Python symlinks
        run: |
-          HOMEBREW_NO_AUTO_UPDATE=1 brew install llvm@15
+          # 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 $formula; done
+      - name: Install LLVM
+        run: |
+          brew install llvm@${{ matrix.version }}
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
-      - name: Build TinyGo
-        run: go install
+      - 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 == 17
+        run: go install
+      - name: Check binary
+        if: matrix.version == 17
+        run: tinygo version
@@ -19,15 +19,26 @@ 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@v3
+        uses: actions/checkout@v4
        with:
          submodules: recursive
      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
      - name: Docker meta
        id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
        with:
          images: |
            tinygo/tinygo-dev
@@ -36,24 +47,24 @@ jobs:
            type=sha,format=long
            type=raw,value=latest
      - name: Log in to Docker Hub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
      - name: Log in to Github Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
-          build-contexts: tinygo-llvm-build=docker-image://tinygo/llvm-15
+          build-contexts: tinygo-llvm-build=docker-image://tinygo/llvm-17
          cache-from: type=gha
          cache-to: type=gha,mode=max
      - name: Trigger Drivers repo build on Github Actions
@@ -18,10 +18,10 @@ jobs:
    # statically linked binary.
    runs-on: ubuntu-latest
    container:
-      image: golang:1.20-alpine
+      image: golang:1.22-alpine
    steps:
      - name: Install apk dependencies
-        # tar: needed for actions/cache@v3
+        # tar: needed for actions/cache@v4
        # git+openssh: needed for checkout (I think?)
        # ruby: needed to install fpm
        run: apk add tar git openssh make g++ ruby
@@ -29,21 +29,21 @@ jobs:
        # We're not on a multi-user machine, so this is safe.
        run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
        with:
          submodules: true
      - name: Cache Go
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        with:
          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@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-source
        with:
-          key: llvm-source-15-linux-alpine-v3
+          key: llvm-source-17-linux-alpine-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -54,7 +54,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -65,10 +65,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-build
        with:
-          key: llvm-build-15-linux-alpine-v4
+          key: llvm-build-17-linux-alpine-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -83,13 +83,13 @@ jobs:
          # 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@v3
+        uses: actions/cache/save@v4
        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@v3
+        uses: actions/cache@v4
        id: cache-binaryen
        with:
          key: binaryen-linux-alpine-v1
@@ -100,10 +100,10 @@ jobs:
          apk add cmake samurai python3
          make binaryen STATIC=1
      - name: Cache wasi-libc
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: cache-wasi-libc
        with:
-          key: wasi-libc-sysroot-linux-alpine-v1
+          key: wasi-libc-sysroot-linux-alpine-v2
          path: lib/wasi-libc/sysroot
      - name: Build wasi-libc
        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
@@ -119,7 +119,7 @@ jobs:
          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
+        uses: actions/upload-artifact@v4
        with:
          name: linux-amd64-double-zipped
          path: |
@@ -131,20 +131,20 @@ jobs:
    needs: build-linux
    steps:
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Install wasmtime
        run: |
          mkdir -p $HOME/.wasmtime $HOME/.wasmtime/bin
-          curl https://github.com/bytecodealliance/wasmtime/releases/download/v5.0.0/wasmtime-v5.0.0-x86_64-linux.tar.xz -o wasmtime-v5.0.0-x86_64-linux.tar.xz -SfL
-          tar -C $HOME/.wasmtime/bin --wildcards -xf wasmtime-v5.0.0-x86_64-linux.tar.xz --strip-components=1 wasmtime-v5.0.0-x86_64-linux/*
+          curl https://github.com/bytecodealliance/wasmtime/releases/download/v14.0.4/wasmtime-v14.0.4-x86_64-linux.tar.xz -o wasmtime-v14.0.4-x86_64-linux.tar.xz -SfL
+          tar -C $HOME/.wasmtime/bin --wildcards -xf wasmtime-v14.0.4-x86_64-linux.tar.xz --strip-components=1 wasmtime-v14.0.4-x86_64-linux/*
          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
      - name: Download release artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
        with:
          name: linux-amd64-double-zipped
      - name: Extract release tarball
@@ -153,6 +153,7 @@ jobs:
          tar -C ~/lib -xf tinygo.linux-amd64.tar.gz
          ln -s ~/lib/tinygo/bin/tinygo ~/go/bin/tinygo
      - run: make tinygo-test-wasi-fast
+      - run: make tinygo-test-wasip1-fast
      - run: make smoketest
  assert-test-linux:
    # Run all tests that can run on Linux, with LLVM assertions enabled to catch
@@ -160,7 +161,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
        with:
          submodules: true
      - name: Install apt dependencies
@@ -175,25 +176,25 @@ jobs:
              simavr \
              ninja-build
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Install Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
        with:
-          node-version: '14'
+          node-version: '18'
      - name: Install wasmtime
        run: |
          mkdir -p $HOME/.wasmtime $HOME/.wasmtime/bin
-          curl -L https://github.com/bytecodealliance/wasmtime/releases/download/v5.0.0/wasmtime-v5.0.0-x86_64-linux.tar.xz -o wasmtime-v5.0.0-x86_64-linux.tar.xz -SfL
-          tar -C $HOME/.wasmtime/bin --wildcards -xf wasmtime-v5.0.0-x86_64-linux.tar.xz --strip-components=1 wasmtime-v5.0.0-x86_64-linux/*
+          curl -L https://github.com/bytecodealliance/wasmtime/releases/download/v14.0.4/wasmtime-v14.0.4-x86_64-linux.tar.xz -o wasmtime-v14.0.4-x86_64-linux.tar.xz -SfL
+          tar -C $HOME/.wasmtime/bin --wildcards -xf wasmtime-v14.0.4-x86_64-linux.tar.xz --strip-components=1 wasmtime-v14.0.4-x86_64-linux/*
          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-source
        with:
-          key: llvm-source-15-linux-asserts-v3
+          key: llvm-source-17-linux-asserts-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -204,7 +205,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -215,10 +216,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-build
        with:
-          key: llvm-build-15-linux-asserts-v4
+          key: llvm-build-17-linux-asserts-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -231,13 +232,13 @@ jobs:
          # 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@v3
+        uses: actions/cache/save@v4
        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@v3
+        uses: actions/cache@v4
        id: cache-binaryen
        with:
          key: binaryen-linux-asserts-v1
@@ -246,10 +247,10 @@ jobs:
        if: steps.cache-binaryen.outputs.cache-hit != 'true'
        run: make binaryen
      - name: Cache wasi-libc
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: cache-wasi-libc
        with:
-          key: wasi-libc-sysroot-linux-asserts-v5
+          key: wasi-libc-sysroot-linux-asserts-v6
          path: lib/wasi-libc/sysroot
      - name: Build wasi-libc
        if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
@@ -266,7 +267,7 @@ jobs:
      - run: make smoketest
      - run: make wasmtest
      - run: make tinygo-baremetal
-  build-linux-arm:
+  build-linux-cross:
    # 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
@@ -275,28 +276,38 @@ 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-20.04
    needs: build-linux
    steps:
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
      - name: Install apt dependencies
        run: |
          sudo apt-get update
          sudo apt-get install --no-install-recommends \
              qemu-user \
-              g++-arm-linux-gnueabihf \
-              libc6-dev-armhf-cross
+              g++-${{ matrix.toolchain }} \
+              libc6-dev-${{ matrix.libc }}-cross
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-source
        with:
-          key: llvm-source-15-linux-v3
+          key: llvm-source-17-linux-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -307,7 +318,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save LLVM source cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -318,10 +329,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore LLVM build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-build
        with:
-          key: llvm-build-15-linux-arm-v4
+          key: llvm-build-17-linux-${{ matrix.goarch }}-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -332,27 +343,27 @@ jobs:
          # Install build dependencies.
          sudo apt-get install --no-install-recommends ninja-build
          # build!
-          make llvm-build CROSS=arm-linux-gnueabihf
+          make llvm-build CROSS=${{ matrix.toolchain }}
          # 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@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
      - name: Cache Binaryen
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: cache-binaryen
        with:
-          key: binaryen-linux-arm-v1
+          key: binaryen-linux-${{ matrix.goarch }}-v3
          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=arm-linux-gnueabihf binaryen
+          git submodule update --init --recursive lib/binaryen
+          make CROSS=${{ matrix.toolchain }} binaryen
      - name: Install fpm
        run: |
          sudo gem install --version 4.0.7 public_suffix
@@ -360,9 +371,9 @@ jobs:
          sudo gem install --no-document fpm
      - name: Build TinyGo binary
        run: |
-          make CROSS=arm-linux-gnueabihf
+          make CROSS=${{ matrix.toolchain }}
      - name: Download amd64 release
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
        with:
          name: linux-amd64-double-zipped
      - name: Extract amd64 release
@@ -373,129 +384,15 @@ jobs:
        run: |
          cp -p build/tinygo   build/release/tinygo/bin
          cp -p build/wasm-opt build/release/tinygo/bin
-      - name: Create arm release
+      - name: Create ${{ matrix.goarch }} release
        run: |
-          make release deb RELEASEONLY=1 DEB_ARCH=armhf
-          cp -p build/release.tar.gz /tmp/tinygo.linux-arm.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_armhf.deb
+          make release deb RELEASEONLY=1 DEB_ARCH=${{ matrix.libc }}
+          cp -p build/release.tar.gz /tmp/tinygo.linux-${{ matrix.goarch }}.tar.gz
+          cp -p build/release.deb    /tmp/tinygo_${{ matrix.libc }}.deb
      - name: Publish release artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
        with:
-          name: linux-arm-double-zipped
+          name: linux-${{ matrix.goarch }}-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-20.04
-    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:
-          go-version: '1.20'
-          cache: true
-      - name: Restore LLVM source cache
-        uses: actions/cache/restore@v3
-        id: cache-llvm-source
-        with:
-          key: llvm-source-15-linux-v3
-          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: Save LLVM source cache
-        uses: actions/cache/save@v3
-        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@v3
-        id: cache-llvm-build
-        with:
-          key: llvm-build-15-linux-arm64-v4
-          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: Save LLVM build cache
-        uses: actions/cache/save@v3
-        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
-        with:
-          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
-          path: llvm-build
-      - name: Cache Binaryen
-        uses: actions/cache@v3
-        id: cache-binaryen
-        with:
-          key: binaryen-linux-arm64-v1
-          path: build/wasm-opt
-      - name: Build Binaryen
-        if: steps.cache-binaryen.outputs.cache-hit != 'true'
-        run: |
-          git submodule update --init lib/binaryen
-          make CROSS=aarch64-linux-gnu binaryen
-      - name: Install fpm
-        run: |
-          sudo gem install --version 4.0.7 public_suffix
-          sudo gem install --version 2.7.6 dotenv
-          sudo gem install --no-document fpm
-      - name: Build TinyGo binary
-        run: |
-          make CROSS=aarch64-linux-gnu
-      - name: Download amd64 release
-        uses: actions/download-artifact@v3
-        with:
-          name: linux-amd64-double-zipped
-      - name: Extract amd64 release
-        run: |
-          mkdir -p build/release
-          tar -xf tinygo.linux-amd64.tar.gz -C build/release tinygo
-      - name: Modify release
-        run: |
-          cp -p build/tinygo   build/release/tinygo/bin
-          cp -p build/wasm-opt build/release/tinygo/bin
-      - name: Create arm64 release
-        run: |
-          make release deb RELEASEONLY=1 DEB_ARCH=arm64
-          cp -p build/release.tar.gz /tmp/tinygo.linux-arm64.tar.gz
-          cp -p build/release.deb    /tmp/tinygo_arm64.deb
-      - name: Publish release artifact
-        uses: actions/upload-artifact@v3
-        with:
-          name: linux-arm64-double-zipped
-          path: |
-            /tmp/tinygo.linux-arm64.tar.gz
-            /tmp/tinygo_arm64.deb
+            /tmp/tinygo.linux-${{ matrix.goarch }}.tar.gz
+            /tmp/tinygo_${{ matrix.libc }}.deb
@@ -25,18 +25,18 @@ jobs:
      contents: read
    steps:
      - name: Check out the repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
        with:
          submodules: recursive
      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
      - name: Docker meta
        id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
        with:
          images: |
-            tinygo/llvm-15
-            ghcr.io/${{ github.repository_owner }}/llvm-15
+            tinygo/llvm-17
+            ghcr.io/${{ github.repository_owner }}/llvm-17
          tags: |
            type=sha,format=long
            type=raw,value=latest
@@ -46,13 +46,13 @@ jobs:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
      - name: Log in to Github Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
        with:
          target: tinygo-llvm-build
          context: .
@@ -0,0 +1,43 @@
+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: Checkout
+        uses: actions/checkout@v4
+      - name: Pull musl
+        run: |
+            git submodule update --init lib/musl
+      - name: Restore LLVM source cache
+        uses: actions/cache/restore@v4
+        id: cache-llvm-source
+        with:
+          key: llvm-source-17-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@v4
+        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@v22
+      - 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"
@@ -0,0 +1,12 @@
+# 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/jammy/ llvm-toolchain-jammy-17 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-17-dev \
+    clang-17 \
+    libclang-17-dev \
+    lld-17
@@ -0,0 +1,91 @@
+name: Binary size difference
+
+on:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  sizediff:
+    runs-on: ubuntu-22.04
+    permissions:
+      pull-requests: write
+    steps:
+      # Prepare, install tools
+      - name: Add GOBIN to $PATH
+        run: |
+          echo "$HOME/go/bin" >> $GITHUB_PATH
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # fetch all history (no sparse checkout)
+          submodules: true
+      - name: Install apt dependencies
+        run: ./.github/workflows/sizediff-install-pkgs.sh
+      - name: Restore LLVM source cache
+        uses: actions/cache@v4
+        id: cache-llvm-source
+        with:
+          key: llvm-source-17-sizediff-v1
+          path: |
+            llvm-project/compiler-rt
+      - name: Download LLVM source
+        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
+        run: make llvm-source
+      - name: Cache Go
+        uses: actions/cache@v4
+        with:
+          key: go-cache-linux-sizediff-v1-${{ 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
@@ -16,7 +16,7 @@ jobs:
    runs-on: windows-2022
    steps:
      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.3
+        uses: al-cheb/configure-pagefile-action@v1.4
        with:
          minimum-size: 8GB
          maximum-size: 24GB
@@ -29,19 +29,19 @@ jobs:
        run: |
          scoop install ninja binaryen
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
        with:
          submodules: true
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Restore cached LLVM source
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-source
        with:
-          key: llvm-source-15-windows-v4
+          key: llvm-source-17-windows-v1
          path: |
            llvm-project/clang/lib/Headers
            llvm-project/clang/include
@@ -52,7 +52,7 @@ jobs:
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        run: make llvm-source
      - name: Save cached LLVM source
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-source.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-source.outputs.cache-primary-key }}
@@ -63,10 +63,10 @@ jobs:
            llvm-project/lld/include
            llvm-project/llvm/include
      - name: Restore cached LLVM build
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
        id: cache-llvm-build
        with:
-          key: llvm-build-15-windows-v6
+          key: llvm-build-17-windows-v1
          path: llvm-build
      - name: Build LLVM
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -80,23 +80,23 @@ jobs:
          # 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@v3
+        uses: actions/cache/save@v4
        if: steps.cache-llvm-build.outputs.cache-hit != 'true'
        with:
          key: ${{ steps.cache-llvm-build.outputs.cache-primary-key }}
          path: llvm-build
      - name: Cache wasi-libc sysroot
-        uses: actions/cache@v3
+        uses: actions/cache@v4
        id: cache-wasi-libc
        with:
-          key: wasi-libc-sysroot-v4
+          key: wasi-libc-sysroot-v5
          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 install wasmtime
+          scoop install wasmtime@14.0.4
      - name: make gen-device
        run: make -j3 gen-device
      - name: Test TinyGo
@@ -116,9 +116,9 @@ jobs:
        # - 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
+        uses: actions/upload-artifact@v4
        with:
-          name: release-double-zipped
+          name: windows-amd64-double-zipped
          path: build/release/release.zip

  smoke-test-windows:
@@ -126,7 +126,7 @@ jobs:
    needs: build-windows
    steps:
      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.3
+        uses: al-cheb/configure-pagefile-action@v1.4
        with:
          minimum-size: 8GB
          maximum-size: 24GB
@@ -139,16 +139,16 @@ jobs:
        run: |
          scoop install binaryen
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Download TinyGo build
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
        with:
-          name: release-double-zipped
+          name: windows-amd64-double-zipped
          path: build/
      - name: Unzip TinyGo build
        shell: bash
@@ -163,22 +163,22 @@ jobs:
    needs: build-windows
    steps:
      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.3
+        uses: al-cheb/configure-pagefile-action@v1.4
        with:
          minimum-size: 8GB
          maximum-size: 24GB
          disk-root: "C:"
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Download TinyGo build
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
        with:
-          name: release-double-zipped
+          name: windows-amd64-double-zipped
          path: build/
      - name: Unzip TinyGo build
        shell: bash
@@ -192,7 +192,7 @@ jobs:
    needs: build-windows
    steps:
      - name: Configure pagefile
-        uses: al-cheb/configure-pagefile-action@v1.3
+        uses: al-cheb/configure-pagefile-action@v1.4
        with:
          minimum-size: 8GB
          maximum-size: 24GB
@@ -203,18 +203,18 @@ jobs:
      - name: Install Dependencies
        shell: bash
        run: |
-          scoop install binaryen wasmtime
+          scoop install binaryen && scoop install wasmtime@14.0.4
      - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
      - name: Install Go
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
        with:
-          go-version: '1.20'
+          go-version: '1.22'
          cache: true
      - name: Download TinyGo build
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
        with:
-          name: release-double-zipped
+          name: windows-amd64-double-zipped
          path: build/
      - name: Unzip TinyGo build
        shell: bash
@@ -9,10 +9,11 @@
 	url = https://github.com/avr-rust/avr-mcu.git
 [submodule "lib/cmsis-svd"]
 	path = lib/cmsis-svd
-	url = https://github.com/tinygo-org/cmsis-svd
+	url = https://github.com/cmsis-svd/cmsis-svd-data.git
+	branch = main
 [submodule "lib/wasi-libc"]
 	path = lib/wasi-libc
-	url = https://github.com/CraneStation/wasi-libc
+	url = https://github.com/WebAssembly/wasi-libc
 [submodule "lib/picolibc"]
 	path = lib/picolibc
 	url = https://github.com/keith-packard/picolibc.git
@@ -31,3 +32,10 @@
 [submodule "lib/macos-minimal-sdk"]
 	path = lib/macos-minimal-sdk
 	url = https://github.com/aykevl/macos-minimal-sdk.git
+[submodule "lib/renesas-svd"]
+	path = lib/renesas-svd
+	url = https://github.com/tinygo-org/renesas-svd.git
+[submodule "src/net"]
+	path = src/net
+	url = https://github.com/tinygo-org/net.git
+	branch = dev
@@ -19,6 +19,7 @@ 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 (1.18+)
+  * GNU Make
  * Standard build tools (gcc/clang)
  * git
  * CMake
@@ -84,7 +85,7 @@ Now that we have a working static build, it's time to make a release tarball:

 If you did not clone the repository with the `--recursive` option, you will get errors until you initialize the project submodules:

-    git submodule update --init
+    git submodule update --init --recursive

 The release tarball is stored in build/release.tar.gz, and can be extracted with
 the following command (for example in ~/lib):
@@ -1,3 +1,233 @@
+0.30.0
+---
+
+* **general**
+  - add LLVM 16 support, use it by default
+* **compiler**
+  - `build`: work around a race condition by building Go SSA serially
+  - `compiler`: fix a crash by not using the LLVM global context types
+  - `interp`: don't copy unknown values in `runtime.sliceCopy` to fix miscompile
+  - `interp`: fix crash in error report by not returning raw LLVM values
+* **standard library**
+  - `machine/usb/adc/midi`: various improvements and API changes
+  - `reflect`: add support for `[...]T` → `[]T` in reflect
+* **targets**
+  - `atsamd21`, `atsamd51`: add support for USB INTERRUPT OUT
+  - `rp2040`: always use the USB device enumeration fix, even in chips that supposedly have the HW fix
+  - `wasm`: increase default stack size to 32k for wasi/wasm
+* **boards**
+  - `gobadge`: add GoBadge target as alias for PyBadge :)
+  - `gemma-m0`: add support for the Adafruit Gemma M0
+
+
+0.29.0
+---
+
+* **general**
+  - Go 1.21 support
+  - use https for renesas submodule #3856
+  - ci: rename release-double-zipped to something more useful
+  - ci: update Node.js from version 14 to version 16
+  - ci: switch GH actions builds to use Go 1.21 final release
+  - docker: update clang to version 15
+  - docker: use Go 1.21 for Docker dev container build
+  - `main`: add target JSON file in `tinygo info` output
+  - `main`: improve detection of filesystems
+  - `main`: use `go env` instead of doing all detection manually
+  - make: add make task to generate Renesas device wrappers
+  - make: add task to check NodeJS version before running tests
+  - add submodule for Renesas SVD file mirror repo
+  - update to go-serial package v1.6.0
+  - `testing`: add Testing function
+  - `tools/gen-device-svd`: small changes needed for Renesas MCUs
+* **compiler**
+  - `builder`: update message for max supported Go version
+  - `compiler,reflect`: NumMethods reports exported methods only
+  - `compiler`: add compiler-rt and wasm symbols to table
+  - `compiler`: add compiler-rt to wasm.json
+  - `compiler`: add min and max builtin support
+  - `compiler`: implement clear builtin for maps
+  - `compiler`: implement clear builtin for slices
+  - `compiler`: improve panic message when a runtime call is unavailable
+  - `compiler`: update .ll test output
+  - `loader`: merge go.env file which is now required starting in Go 1.21 to correctly get required packages
+* **standard library**
+  - `os`: define ErrNoDeadline
+  - `reflect`: Add FieldByNameFunc
+  - `reflect`: add SetZero
+  - `reflect`: fix iterating over maps with interface{} keys
+  - `reflect`: implement Value.Grow
+  - `reflect`: remove unecessary heap allocations
+  - `reflect`: use .key() instead of a type assert
+  - `sync`: add implementation from upstream Go for OnceFunc, OnceValue, and OnceValues
+* **targets**
+  - `machine`: UART refactor (#3832)
+  - `machine/avr`: pin change interrupt
+  - `machine/macropad_rp2040`: add machine.BUTTON
+  - `machine/nrf`: add I2C timeout
+  - `machine/nrf`: wait for stop condition after reading from the I2C bus
+  - `machine/nRF52`: set SPI TX/RX lengths even data is empty. Fixes #3868 (#3877)
+  - `machine/rp2040`: add missing suffix to CMD_READ_STATUS
+  - `machine/rp2040`: add NoPin support
+  - `machine/rp2040`: move flash related functions into separate file from C imports for correct  - LSP. Fixes #3852
+  - `machine/rp2040`: wait for 1000 us after flash reset to avoid issues with busy USB bus
+  - `machine/samd51,rp2040,nrf528xx,stm32`: implement watchdog
+  - `machine/samd51`: fix i2cTimeout was decreasing due to cache activation
+  - `machine/usb`: Add support for HID Keyboard LEDs
+  - `machine/usb`: allow USB Endpoint settings to be changed externally
+  - `machine/usb`: refactor endpoint configuration
+  - `machine/usb`: remove usbDescriptorConfig
+  - `machine/usb/hid,joystick`: fix hidreport (3) (#3802)
+  - `machine/usb/hid`: add RxHandler interface
+  - `machine/usb/hid`: rename Handler() to TxHandler()
+  - `wasi`: allow zero inodes when reading directories
+  - `wasm`: add support for GOOS=wasip1
+  - `wasm`: fix functions exported through //export
+  - `wasm`: remove i64 workaround, use BigInt instead
+  - `example`: adjust time offset
+  - `example`: simplify pininterrupt
+* **boards**
+  - `targets`: add AKIZUKI DENSHI AE-RP2040
+  - `targets`: adding new uf2 target for PCA10056 (#3765)
+
+
+0.28.0
+---
+
+* **general**
+  - fix parallelism in the compiler on Windows by building LLVM with thread support
+  - support qemu-user debugging
+  - make target JSON msd-volume-name an array
+  - print source location when a panic happens in -monitor
+  - `test`: don't print `ok` for a successful compile-only
+* **compiler**
+  - `builder`: remove non-ThinLTO build mode
+  - `builder`: fail earlier if Go is not available
+  - `builder`: improve `-size=full` in a number of ways
+  - `builder`: implement Nordic DFU file writer in Go
+  - `cgo`: allow `LDFLAGS: --export=...`
+  - `compiler`: support recursive slice types
+  - `compiler`: zero struct padding during map operations
+  - `compiler`: add llvm.ident metadata
+  - `compiler`: remove `unsafe.Pointer(uintptr(v) + idx)` optimization (use `unsafe.Add` instead)
+  - `compiler`: add debug info to `//go:embed` data structures for better `-size` output
+  - `compiler`: add debug info to string constants
+  - `compiler`: fix a minor race condition
+  - `compiler`: emit correct alignment in debug info for global variables
+  - `compiler`: correctly generate reflect data for local named types
+  - `compiler`: add alloc attributes to `runtime.alloc`, reducing flash usage slightly
+  - `compiler`: for interface maps, use the original named type if available
+  - `compiler`: implement most math/bits functions as LLVM intrinsics
+  - `compiler`: ensure all defers have been seen before creating rundefers
+* **standard library**
+  - `internal/task`: disallow blocking inside an interrupt
+  - `machine`: add `CPUReset`
+  - `machine/usb/hid`: add MediaKey support
+  - `machine/usb/hid/joystick`: move joystick under HID
+  - `machine/usb/hid/joystick`: allow joystick settings override
+  - `machine/usb/hid/joystick`: handle case where we cannot find the correct HID descriptor
+  - `machine/usb/hid/mouse`: add support for mouse back and forward
+  - `machine/usb`: add ability to override default VID, PID, manufacturer name, and product name
+  - `net`: added missing `TCPAddr` and `UDPAddr` implementations
+  - `os`: add IsTimeout function
+  - `os`: fix resource leak in `(*File).Close`
+  - `os`: add `(*File).Sync`
+  - `os`: implement `(*File).ReadDir` for wasi
+  - `os`: implement `(*File).WriteAt`
+  - `reflect`: make sure null bytes are supported in tags
+  - `reflect`: refactor this package to enable many new features
+  - `reflect`: add map type methods: `Elem` and `Key`
+  - `reflect`: add map methods: `MapIndex`, `MapRange`/`MapIter`, `SetMapIndex`, `MakeMap`, `MapKeys`
+  - `reflect`: add slice methods: `Append`, `MakeSlice`, `Slice`, `Slice3`, `Copy`, `Bytes`, `SetLen`
+  - `reflect`: add misc methods: `Zero`, `Addr`, `UnsafeAddr`, `OverflowFloat`, `OverflowInt`, `OverflowUint`, `SetBytes`, `Convert`, `CanInt`, `CanFloat`, `CanComplex`, `Comparable`
+  - `reflect`: add type methods: `String`, `PkgPath`, `FieldByName`, `FieldByIndex`, `NumMethod`
+  - `reflect`: add stubs for `Type.Method`, `CanConvert`, `ArrayOf`, `StructOf`, `MapOf`
+  - `reflect`: add stubs for channel select routines/types
+  - `reflect`: allow nil rawType to call Kind()
+  - `reflect`: ensure all ValueError panics have Kind fields
+  - `reflect`: add support for named types
+  - `reflect`: improve `Value.String()`
+  - `reflect`: set `Index` and `PkgPath` field in `Type.Field`
+  - `reflect`: `Type.AssignableTo`: you can assign anything to `interface{}`
+  - `reflect`: add type check to `Value.Field`
+  - `reflect`: let `TypeOf(nil)` return nil
+  - `reflect`: move `StructField.Anonymous` field to match upstream location
+  - `reflect`: add `UnsafePointer` for Func types
+  - `reflect`: `MapIter.Next` needs to allocate new keys/values every time
+  - `reflect`: fix `IsNil` for interfaces
+  - `reflect`: fix `Type.Name` to return an empty string for non-named types
+  - `reflect`: add `VisibleFields`
+  - `reflect`: properly handle embedded structs
+  - `reflect`: make sure `PointerTo` works for named types
+  - `reflect`: `Set`: convert non-interface to interface
+  - `reflect`: `Set`: fix direction of assignment check
+  - `reflect`: support channel directions
+  - `reflect`: print struct tags in Type.String()
+  - `reflect`: properly handle read-only values
+  - `runtime`: allow custom-gc SetFinalizer and clarify KeepAlive
+  - `runtime`: implement KeepAlive using inline assembly
+  - `runtime`: check for heap allocations inside interrupts
+  - `runtime`: properly turn pointer into empty interface when hashing
+  - `runtime`: improve map size hint usage
+  - `runtime`: zero map key/value on deletion to so GC doesn't see them
+  - `runtime`: print the address where a panic happened
+  - `runtime/debug`: stub `SetGCPercent`, `BuildInfo.Settings`
+  - `runtime/metrics`: add this package as a stub
+  - `syscall`: `Stat_t` timespec fields are Atimespec on darwin
+  - `syscall`: add `Timespec.Unix()` for wasi
+  - `syscall`: add fsync using libc
+  - `testing`: support -test.count
+  - `testing`: make test output unbuffered when verbose
+  - `testing`: add -test.skip
+  - `testing`: move runtime.GC() call to runN to match upstream
+  - `testing`: add -test.shuffle to order randomize test and benchmark order
+* **targets**
+  - `arm64`: fix register save/restore to include vector registers
+  - `attiny1616`: add support for this chip
+  - `cortexm`: refactor EnableInterrupts and DisableInterrupts to avoid `arm.AsmFull`
+  - `cortexm`: enable functions in RAM for go & cgo
+  - `cortexm`: convert SystemStack from `AsmFull` to C inline assembly
+  - `cortexm`: fix crash due to wrong stack size offset
+  - `nrf`: samd21, stm32: add flash API
+  - `nrf`: fix memory issue in ADC read
+  - `nrf`: new peripheral type for nrf528xx chips
+  - `nrf`: implement target mode
+  - `nrf`: improve ADC and add oversampling, longer sample time, and reference voltage
+  - `rp2040`: change calling order for device enumeration fix to do first
+  - `rp2040`: rtc delayed interrupt
+  - `rp2040`: provide better errors for invalid pins on I2C and SPI
+  - `rp2040`: change uart to allow for a single pin
+  - `rp2040`: implement Flash interface
+  - `rp2040`: remove SPI `DataBits` property
+  - `rp2040`: unify all linker scripts using LDFLAGS
+  - `rp2040`: remove SPI deadline for improved performance
+  - `rp2040`: use 4MHz as default frequency for SPI
+  - `rp2040`: implement target mode
+  - `rp2040`: use DMA for send-only SPI transfers
+  - `samd21`: rearrange switch case for get pin cfg
+  - `samd21`: fix issue with WS2812 driver by making pin accesses faster
+  - `samd51`: enable CMCC cache for greatly improved performance
+  - `samd51`: remove extra BK0RDY clear
+  - `samd51`: implement Flash interface
+  - `samd51`: use correct SPI frequency
+  - `samd51`: remove extra BK0RDY clear
+  - `samd51`: fix ADC multisampling
+  - `wasi`: allow users to set the `runtime_memhash_tsip` or `runtime_memhash_fnv` build tags
+  - `wasi`: set `WASMTIME_BACKTRACE_DETAILS` when running in wasmtime.
+  - `wasm`: implement the `//go:wasmimport` directive
+* **boards**
+  - `gameboy-advance`: switch to use register definitions in device/gba
+  - `gameboy-advance`: rename display and make pointer receivers
+  - `gopher-badge`: Added Gopher Badge support
+  - `lorae5`: add needed definition for UART2
+  - `lorae5`: correct mapping for I2C bus, add pin mapping to enable power
+  - `pinetime`: update the target file (rename from pinetime-devkit0)
+  - `qtpy`: fix bad pin assignment
+  - `wioterminal`: fix pin definition of BCM13
+  - `xiao`: Pins D4 & D5 are I2C1. Use pins D2 & D3 for I2C0.
+  - `xiao`: add DefaultUART
+
+
 0.27.0
 ---

@@ -1,10 +1,15 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.20 AS tinygo-llvm
+FROM golang:1.22 AS tinygo-llvm

 RUN apt-get update && \
-    apt-get install -y apt-utils make cmake clang-11 ninja-build
+    apt-get install -y apt-utils make cmake clang-15 ninja-build && \
+    rm -rf \
+        /var/lib/apt/lists/* \
+        /var/log/* \
+        /var/tmp/* \
+        /tmp/*

-COPY ./Makefile /tinygo/Makefile
+COPY ./GNUmakefile /tinygo/GNUmakefile

 RUN cd /tinygo/ && \
    make llvm-source
@@ -15,26 +20,24 @@ FROM tinygo-llvm AS tinygo-llvm-build
 RUN cd /tinygo/ && \
    make llvm-build

-# tinygo-compiler stage builds the compiler itself
-FROM tinygo-llvm-build AS tinygo-compiler
+# tinygo-compiler-build stage builds the compiler itself
+FROM tinygo-llvm-build AS tinygo-compiler-build

 COPY . /tinygo

-# update submodules
+# build the compiler and tools
 RUN cd /tinygo/ && \
-    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 && \
+    git submodule update --init --recursive && \
    make gen-device -j4 && \
-    cp build/* $GOPATH/bin/
+    make build/release

+# tinygo-compiler copies the compiler build over to a base Go container (without
+# all the build tools etc).
+FROM golang:1.21 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"]
@@ -10,7 +10,7 @@ LLD_SRC ?= $(LLVM_PROJECTDIR)/lld

 # Try to autodetect LLVM build tools.
 # Versions are listed here in descending priority order.
-LLVM_VERSIONS = 15 14 13 12 11
+LLVM_VERSIONS = 17 16 15
 errifempty = $(if $(1),$(1),$(error $(2)))
 detect = $(shell which $(call errifempty,$(firstword $(foreach p,$(2),$(shell command -v $(p) 2> /dev/null && echo $(p)))),failed to locate $(1) at any of: $(2)))
 toolSearchPathsVersion = $(1)-$(2)
@@ -32,9 +32,6 @@ export GOROOT = $(shell $(GO) env GOROOT)
 # Flags to pass to go test.
 GOTESTFLAGS ?=

-# md5sum binary
-MD5SUM = md5sum
-
 # tinygo binary for tests
 TINYGO ?= $(call detect,tinygo,tinygo $(CURDIR)/build/tinygo)

@@ -113,7 +110,7 @@ endif

 .PHONY: all tinygo test $(LLVM_BUILDDIR) llvm-source clean fmt gen-device gen-device-nrf gen-device-nxp gen-device-avr gen-device-rp

-LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf debuginfopdb executionengine frontendopenmp instrumentation interpreter ipo irreader libdriver linker lto mc mcjit objcarcopts option profiledata scalaropts support target windowsdriver windowsmanifest
+LLVM_COMPONENTS = all-targets analysis asmparser asmprinter bitreader bitwriter codegen core coroutines coverage debuginfodwarf debuginfopdb executionengine frontendhlsl frontendopenmp instrumentation interpreter ipo irreader libdriver linker lto mc mcjit objcarcopts option profiledata scalaropts support target windowsdriver windowsmanifest

 ifeq ($(OS),Windows_NT)
    EXE = .exe
@@ -130,14 +127,14 @@ ifeq ($(OS),Windows_NT)
    USE_SYSTEM_BINARYEN ?= 1

 else ifeq ($(shell uname -s),Darwin)
-    MD5SUM = md5
+    MD5SUM ?= md5

    CGO_LDFLAGS += -lxar

    USE_SYSTEM_BINARYEN ?= 1

 else ifeq ($(shell uname -s),FreeBSD)
-    MD5SUM = md5
+    MD5SUM ?= md5
    START_GROUP = -Wl,--start-group
    END_GROUP = -Wl,--end-group
 else
@@ -145,6 +142,9 @@ else
    END_GROUP = -Wl,--end-group
 endif

+# md5sum binary default, can be overridden by an environment variable
+MD5SUM ?= md5sum
+
 # Libraries that should be linked in for the statically linked Clang.
 CLANG_LIB_NAMES = clangAnalysis clangAST clangASTMatchers clangBasic clangCodeGen clangCrossTU clangDriver clangDynamicASTMatchers clangEdit clangExtractAPI clangFormat clangFrontend clangFrontendTool clangHandleCXX clangHandleLLVM clangIndex clangLex clangParse clangRewrite clangRewriteFrontend clangSema clangSerialization clangSupport clangTooling clangToolingASTDiff clangToolingCore clangToolingInclusions
 CLANG_LIBS = $(START_GROUP) $(addprefix -l,$(CLANG_LIB_NAMES)) $(END_GROUP) -lstdc++
@@ -154,7 +154,7 @@ LLD_LIB_NAMES = lldCOFF lldCommon lldELF lldMachO lldMinGW lldWasm
 LLD_LIBS = $(START_GROUP) $(addprefix -l,$(LLD_LIB_NAMES)) $(END_GROUP)

 # Other libraries that are needed to link TinyGo.
-EXTRA_LIB_NAMES = LLVMInterpreter LLVMMCA LLVMX86TargetMCA
+EXTRA_LIB_NAMES = LLVMInterpreter LLVMMCA LLVMRISCVTargetMCA LLVMX86TargetMCA

 # All libraries to be built and linked with the tinygo binary (lib/lib*.a).
 LIB_NAMES = clang $(CLANG_LIB_NAMES) $(LLD_LIB_NAMES) $(EXTRA_LIB_NAMES)
@@ -170,7 +170,7 @@ NINJA_BUILD_TARGETS = clang llvm-config llvm-ar llvm-nm $(addprefix lib/lib,$(ad
 # For static linking.
 ifneq ("$(wildcard $(LLVM_BUILDDIR)/bin/llvm-config*)","")
    CGO_CPPFLAGS+=$(shell $(LLVM_CONFIG_PREFIX) $(LLVM_BUILDDIR)/bin/llvm-config --cppflags) -I$(abspath $(LLVM_BUILDDIR))/tools/clang/include -I$(abspath $(CLANG_SRC))/include -I$(abspath $(LLD_SRC))/include
-    CGO_CXXFLAGS=-std=c++14
+    CGO_CXXFLAGS=-std=c++17
    CGO_LDFLAGS+=-L$(abspath $(LLVM_BUILDDIR)/lib) -lclang $(CLANG_LIBS) $(LLD_LIBS) $(shell $(LLVM_CONFIG_PREFIX) $(LLVM_BUILDDIR)/bin/llvm-config --ldflags --libs --system-libs $(LLVM_COMPONENTS)) -lstdc++ $(CGO_LDFLAGS_EXTRA)
 endif

@@ -190,7 +190,7 @@ gen-device: gen-device-stm32
 endif

 gen-device-avr:
-	@if [ ! -e lib/avr/README.md ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
+	@if [ ! -e lib/avr/README.md ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init --recursive"; exit 1; fi
 	$(GO) build -o ./build/gen-device-avr ./tools/gen-device-avr/
 	./build/gen-device-avr lib/avr/packs/atmega src/device/avr/
 	./build/gen-device-avr lib/avr/packs/tiny src/device/avr/
@@ -232,9 +232,13 @@ gen-device-rp: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/RaspberryPi lib/cmsis-svd/data/RaspberryPi/ src/device/rp/
 	GO111MODULE=off $(GO) fmt ./src/device/rp

+gen-device-renesas: build/gen-device-svd
+	./build/gen-device-svd -source=https://github.com/tinygo-org/renesas-svd lib/renesas-svd/ src/device/renesas/
+	GO111MODULE=off $(GO) fmt ./src/device/renesas
+
 # Get LLVM sources.
 $(LLVM_PROJECTDIR)/llvm:
-	git clone -b xtensa_release_15.x --depth=1 https://github.com/espressif/llvm-project $(LLVM_PROJECTDIR)
+	git clone -b xtensa_release_17.0.1 --depth=1 https://github.com/espressif/llvm-project $(LLVM_PROJECTDIR)
 llvm-source: $(LLVM_PROJECTDIR)/llvm

 # Configure LLVM.
@@ -260,15 +264,25 @@ endif
 .PHONY: wasi-libc
 wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
 lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
-	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
-	cd lib/wasi-libc && make -j4 EXTRA_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC=$(CLANG) AR=$(LLVM_AR) NM=$(LLVM_NM)
+	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init --recursive"; exit 1; fi
+	cd lib/wasi-libc && $(MAKE) -j4 EXTRA_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC="$(CLANG)" AR=$(LLVM_AR) NM=$(LLVM_NM)

+# Check for Node.js used during WASM tests.
+NODEJS_VERSION := $(word 1,$(subst ., ,$(shell node -v | cut -c 2-)))
+MIN_NODEJS_VERSION=18
+
+.PHONY: check-nodejs-version
+check-nodejs-version:
+ifeq (, $(shell which node))
+	@echo "Install NodeJS version 18+ to run tests."; exit 1;
+endif
+	@if [ $(NODEJS_VERSION) -lt $(MIN_NODEJS_VERSION) ]; then echo "Install NodeJS version 18+ to run tests."; exit 1; fi

 # Build the Go compiler.
 tinygo:
-	@if [ ! -f "$(LLVM_BUILDDIR)/bin/llvm-config" ]; then echo "Fetch and build LLVM first by running:"; echo "  make llvm-source"; echo "  make $(LLVM_BUILDDIR)"; exit 1; fi
+	@if [ ! -f "$(LLVM_BUILDDIR)/bin/llvm-config" ]; then echo "Fetch and build LLVM first by running:"; echo "  $(MAKE) llvm-source"; echo "  $(MAKE) $(LLVM_BUILDDIR)"; exit 1; fi
 	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GOENVFLAGS) $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags "byollvm osusergo" -ldflags="-X github.com/tinygo-org/tinygo/goenv.GitSha1=`git rev-parse --short HEAD`" .
-test: wasi-libc
+test: wasi-libc check-nodejs-version
 	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test $(GOTESTFLAGS) -timeout=20m -buildmode exe -tags "byollvm osusergo" ./builder ./cgo ./compileopts ./compiler ./interp ./transform .

 # Standard library packages that pass tests on darwin, linux, wasi, and windows, but take over a minute in wasi
@@ -413,8 +427,12 @@ tinygo-bench-fast:
 # Same thing, except for wasi rather than the current platform.
 tinygo-test-wasi:
 	$(TINYGO) test -target wasi $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
+tinygo-test-wasip1:
+	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
 tinygo-test-wasi-fast:
 	$(TINYGO) test -target wasi $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
+tinygo-test-wasip1-fast:
+	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
 tinygo-bench-wasi:
 	$(TINYGO) test -target wasi -bench . $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW)
 tinygo-bench-wasi-fast:
@@ -478,10 +496,18 @@ smoketest:
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/test
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/time-offset
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/hid-mouse
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/hid-keyboard
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/i2c-target
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/watchdog
+	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=feather-rp2040      examples/device-id
+	@$(MD5SUM) test.hex
 	# test simulated boards on play.tinygo.org
 ifneq ($(WASM), 0)
 	$(TINYGO) build -size short -o test.wasm -tags=arduino              examples/blinky1
@@ -526,12 +552,16 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10059            examples/blinky2
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=bluemicro840        examples/blinky2
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=feather-m0          examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=trinket-m0          examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=gemma-m0            examples/blinky1
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-express examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-bluefruit examples/blinky1
@@ -562,7 +592,7 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=particle-xenon      examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pinetime-devkit0    examples/blinky1
+	$(TINYGO) build -size short -o test.hex -target=pinetime            examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=x9pro               examples/blinky1
 	@$(MD5SUM) test.hex
@@ -638,6 +668,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=gopher-badge      examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=ae-rp2040           examples/echo
+	@$(MD5SUM) test.hex
 	# test pwm
 	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
 	@$(MD5SUM) test.hex
@@ -652,6 +684,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=feather-nrf52840    examples/usb-midi
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=nrf52840-s140v6-uf2-generic	examples/serial
+	@$(MD5SUM) test.hex
 ifneq ($(STM32), 0)
 	$(TINYGO) build -size short -o test.hex -target=bluepill            examples/blinky1
 	@$(MD5SUM) test.hex
@@ -685,7 +719,11 @@ ifneq ($(STM32), 0)
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=swan                examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=mksnanov3           examples/blinky1
+	@$(MD5SUM) test.hex
 endif
+	$(TINYGO) build -size short -o test.hex -target=atmega328pb         examples/blinkm
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=atmega1284p         examples/serial
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino             examples/blinky1
@@ -702,6 +740,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino-nano        examples/blinky1
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=attiny1616          examples/empty
+	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark           examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark -gc=leaking examples/blinky1
@@ -715,12 +755,12 @@ ifneq ($(XTENSA), 0)
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target m5stack             examples/serial
 	@$(MD5SUM) test.bin
+	$(TINYGO) build -size short -o test.bin -target m5stick-c           examples/serial
+	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target mch2022             examples/serial
 	@$(MD5SUM) test.bin
 endif
-	$(TINYGO) build -size short -o test.bin -target=esp32c3             examples/serial
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=esp32c3-12f         examples/serial
+	$(TINYGO) build -size short -o test.bin -target=qtpy-esp32c3        examples/serial
 	@$(MD5SUM) test.bin
 	$(TINYGO) build -size short -o test.bin -target=m5stamp-c3          examples/serial
 	@$(MD5SUM) test.bin
@@ -733,6 +773,7 @@ endif
 ifneq ($(WASM), 0)
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/export
 	$(TINYGO) build -size short -o wasm.wasm -target=wasm               examples/wasm/main
+	$(TINYGO) build -size short -o wasm.wasm -target=wasm-unknown       examples/hello-wasm-unknown
 endif
 	# test various compiler flags
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -gc=none -scheduler=none examples/blinky1
@@ -741,6 +782,8 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -serial=none examples/echo
 	@$(MD5SUM) test.hex
+	$(TINYGO) build -size short -o test.hex -target=pca10040 -serial=rtt examples/echo
+	@$(MD5SUM) test.hex
 	$(TINYGO) build             -o test.nro -target=nintendoswitch      examples/serial
 	@$(MD5SUM) test.nro
 	$(TINYGO) build -size short -o test.hex -target=pca10040 -opt=0     ./testdata/stdlib.go
@@ -800,6 +843,7 @@ endif
 	@cp -rp lib/musl/src/include         build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/internal        build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/legacy          build/release/tinygo/lib/musl/src
+	@cp -rp lib/musl/src/linux           build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/malloc          build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/mman            build/release/tinygo/lib/musl/src
 	@cp -rp lib/musl/src/math            build/release/tinygo/lib/musl/src
@@ -844,7 +888,7 @@ deb:
 	@mkdir -p build/release-deb/usr/local/lib
 	cp -ar build/release/tinygo build/release-deb/usr/local/lib/tinygo
 	ln -sf ../lib/tinygo/bin/tinygo build/release-deb/usr/local/bin/tinygo
-	fpm -f -s dir -t deb -n tinygo -a $(DEB_ARCH) -v $(shell grep "const Version = " goenv/version.go | awk '{print $$NF}') -m '@tinygo-org' --description='TinyGo is a Go compiler for small places.' --license='BSD 3-Clause' --url=https://tinygo.org/ --deb-changelog CHANGELOG.md -p build/release.deb -C ./build/release-deb
+	fpm -f -s dir -t deb -n tinygo -a $(DEB_ARCH) -v $(shell grep "const version = " goenv/version.go | awk '{print $$NF}') -m '@tinygo-org' --description='TinyGo is a Go compiler for small places.' --license='BSD 3-Clause' --url=https://tinygo.org/ --deb-changelog CHANGELOG.md -p build/release.deb -C ./build/release-deb

 ifneq ($(RELEASEONLY), 1)
 release: build/release
@@ -1,7 +1,7 @@
-Copyright (c) 2018-2022 The TinyGo Authors. All rights reserved.
+Copyright (c) 2018-2023 The TinyGo Authors. All rights reserved.

 TinyGo includes portions of the Go standard library.
-Copyright (c) 2009-2022 The Go Authors. All rights reserved.
+Copyright (c) 2009-2023 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.
@@ -1,11 +1,13 @@
 # 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) [![CircleCI](https://circleci.com/gh/tinygo-org/tinygo/tree/dev.svg?style=svg)](https://circleci.com/gh/tinygo-org/tinygo/tree/dev)
+[![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) [![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), and command-line tools.
+TinyGo is a Go compiler intended for use in small places such as microcontrollers, WebAssembly (wasm/wasi), 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.

+## Embedded
+
 Here is an example program that blinks the built-in LED when run directly on any supported board with onboard LED:

 ```go
@@ -35,115 +37,62 @@ The above program can be compiled and run without modification on an Arduino Uno
 tinygo flash -target arduino 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@Edge (https://developer.fastly.com/learning/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:wasm-module yourmodulename
+//export add
+func add(x, y uint32) uint32 {
+	return x + y
+}
+
+// main is required for the `wasi` target, even if it isn't used.
+func main() {}
+```
+
+This compiles the above TinyGo program for use on any WASI runtime:
+
+```shell
+tinygo build -o main.wasm -target=wasi main.go
+```
+
 ## 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 boards/targets
+## Supported targets

-You can compile TinyGo programs for microcontrollers, WebAssembly and Linux.
+### Embedded

-The following 94 microcontroller boards are currently supported:
+You can compile TinyGo programs for over 94 different microcontroller boards.

-* [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/)
+For more information, please see https://tinygo.org/docs/reference/microcontrollers/

+### WebAssembly

-For more information, see [this list of boards](https://tinygo.org/microcontrollers/). Pull requests for additional support are welcome!
+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/

 ## Currently supported features:

@@ -12,6 +12,7 @@ import (
 	"path/filepath"
 	"time"

+	wasm "github.com/aykevl/go-wasm"
 	"github.com/blakesmith/ar"
 )

@@ -74,8 +75,25 @@ 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.SectionImport:
+					for _, ln := range section.Entries {
+
+						if ln.Kind != wasm.ExtKindFunction {
+							// Not a function
+							continue
+						}
+						symbolTable = append(symbolTable, struct {
+							name      string
+							fileIndex int
+						}{ln.Field, i})
+					}
+				}
+			}
 		} else {
-			return fmt.Errorf("failed to open file %s as ELF or PE/COFF: %w", objpath, err)
+			return fmt.Errorf("failed to open file %s as WASM, ELF or PE/COFF: %w", objpath, err)
 		}

 		// Close file, to avoid issues with too many open files (especially on
@@ -83,8 +83,7 @@ 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         int               // LLVM optimization level (0-3)
-	SizeLevel        int               // LLVM optimization for size level (0-2)
+	OptLevel         string            // LLVM optimization level (O0, O1, O2, Os, Oz)
 	UndefinedGlobals []string          // globals that are left as external globals (no initializer)
 }

@@ -115,6 +114,30 @@ 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{}
+		}
+		for k, v := range vals {
+			globalValues[pkgPath][k] = v
+		}
+	}
+
 	// Check for a libc dependency.
 	// As a side effect, this also creates the headers for the given libc, if
 	// the libc needs them.
@@ -158,7 +181,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		return BuildResult{}, fmt.Errorf("unknown libc: %s", config.Target.Libc)
 	}

-	optLevel, sizeLevel, _ := config.OptLevels()
+	optLevel, speedLevel, sizeLevel := config.OptLevel()
 	compilerConfig := &compiler.Config{
 		Triple:          config.Triple(),
 		CPU:             config.CPU(),
@@ -169,13 +192,14 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		CodeModel:       config.CodeModel(),
 		RelocationModel: config.RelocationModel(),
 		SizeLevel:       sizeLevel,
-		TinyGoVersion:   goenv.Version,
+		TinyGoVersion:   goenv.Version(),

 		Scheduler:          config.Scheduler(),
 		AutomaticStackSize: config.AutomaticStackSize(),
 		DefaultStackSize:   config.StackSize(),
+		MaxStackAlloc:      config.MaxStackAlloc(),
 		NeedsStackObjects:  config.NeedsStackObjects(),
-		Debug:              true,
+		Debug:              !config.Options.SkipDWARF, // emit DWARF except when -internal-nodwarf is passed
 	}

 	// Load the target machine, which is the LLVM object that contains all
@@ -188,7 +212,7 @@ 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, config.ClangHeaders, types.Config{
+	lprogram, err := loader.Load(config, pkgName, types.Config{
 		Sizes: compiler.Sizes(machine),
 	})
 	if err != nil {
@@ -217,26 +241,12 @@ 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 config.Options.GlobalValues[pkg.Pkg.Path()] {
+		for name := range globalValues[pkg.Pkg.Path()] {
 			undefinedGlobals = append(undefinedGlobals, name)
 		}
 		sort.Strings(undefinedGlobals)
@@ -313,7 +323,6 @@ 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 {
@@ -336,6 +345,10 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		}
 		packageActionIDJobs[pkg.ImportPath] = packageActionIDJob

+		// Build the SSA for the given package.
+		ssaPkg := program.Package(pkg.Pkg)
+		ssaPkg.Build()
+
 		// Now create the job to actually build the package. It will exit early
 		// if the package is already compiled.
 		job := &compileJob{
@@ -520,13 +533,13 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			irbuilder := mod.Context().NewBuilder()
 			defer irbuilder.Dispose()
 			irbuilder.SetInsertPointAtEnd(block)
-			i8ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
+			ptrType := 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(i8ptrType)}, "")
+				irbuilder.CreateCall(pkgInit.GlobalValueType(), pkgInit, []llvm.Value{llvm.Undef(ptrType)}, "")
 			}
 			irbuilder.CreateRetVoid()

@@ -561,7 +574,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe

 			// Run all optimization passes, which are much more effective now
 			// that the optimizer can see the whole program at once.
-			err := optimizeProgram(mod, config)
+			err := optimizeProgram(mod, config, globalValues)
 			if err != nil {
 				return err
 			}
@@ -650,7 +663,7 @@ 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(), config.Options.PrintCommands)
+				result, err := compileAndCacheCFile(abspath, tmpdir, config.CFlags(false), config.Options.PrintCommands)
 				job.result = result
 				return err
 			},
@@ -731,17 +744,17 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			if config.GOOS() == "windows" {
 				// Options for the MinGW wrapper for the lld COFF linker.
 				ldflags = append(ldflags,
-					"-Xlink=/opt:lldlto="+strconv.Itoa(optLevel),
+					"-Xlink=/opt:lldlto="+strconv.Itoa(speedLevel),
 					"--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),
+					"--lto-O"+strconv.Itoa(speedLevel),
 					"-cache_path_lto", filepath.Join(cacheDir, "thinlto"))
 			} else {
 				// Options for the ELF linker.
 				ldflags = append(ldflags,
-					"--lto-O"+strconv.Itoa(optLevel),
+					"--lto-O"+strconv.Itoa(speedLevel),
 					"--thinlto-cache-dir="+filepath.Join(cacheDir, "thinlto"),
 				)
 			}
@@ -752,7 +765,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			if sizeLevel >= 2 {
 				// Workaround with roughly the same effect as
 				// https://reviews.llvm.org/D119342.
-				// Can hopefully be removed in LLVM 15.
+				// Can hopefully be removed in LLVM 18.
 				ldflags = append(ldflags,
 					"-mllvm", "--rotation-max-header-size=0")
 			}
@@ -795,21 +808,8 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe

 			// Run wasm-opt for wasm binaries
 			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)
-				}
+				optLevel, _, _ := config.OptLevel()
+				opt := "-" + optLevel

 				var args []string

@@ -909,13 +909,8 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		}
 	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, tmphexpath, result.Binary)
+		err = makeDFUFirmwareImage(config.Options, result.Executable, result.Binary)
 		if err != nil {
 			return result, err
 		}
@@ -1035,7 +1030,7 @@ func createEmbedObjectFile(data, hexSum, sourceFile, sourceDir, tmpdir string, c
 // optimizeProgram runs a series of optimizations and transformations that are
 // 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 {
+func optimizeProgram(mod llvm.Module, config *compileopts.Config, globalValues map[string]map[string]string) error {
 	err := interp.Run(mod, config.Options.InterpTimeout, config.DumpSSA())
 	if err != nil {
 		return err
@@ -1054,26 +1049,14 @@ func optimizeProgram(mod llvm.Module, config *compileopts.Config) error {
 	}

 	// Insert values from -ldflags="-X ..." into the IR.
-	err = setGlobalValues(mod, config.Options.GlobalValues)
+	err = setGlobalValues(mod, 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)
+	// Run most of the whole-program optimizations (including the whole
+	// O0/O1/O2/Os/Oz optimization pipeline).
+	errs := transform.Optimize(mod, config)
 	if len(errs) > 0 {
 		return newMultiError(errs)
 	}
@@ -8,7 +8,6 @@ import (
 	"testing"

 	"github.com/tinygo-org/tinygo/compileopts"
-	"github.com/tinygo-org/tinygo/goenv"
 	"tinygo.org/x/go-llvm"
 )

@@ -36,6 +35,7 @@ func TestClangAttributes(t *testing.T) {
 		"riscv-qemu",
 		"wasi",
 		"wasm",
+		"wasm-unknown",
 	}
 	if hasBuiltinTools {
 		// hasBuiltinTools is set when TinyGo is statically linked with LLVM,
@@ -60,6 +60,7 @@ func TestClangAttributes(t *testing.T) {
 		{GOOS: "darwin", GOARCH: "arm64"},
 		{GOOS: "windows", GOARCH: "amd64"},
 		{GOOS: "windows", GOARCH: "arm64"},
+		{GOOS: "wasip1", GOARCH: "wasm"},
 	} {
 		name := "GOOS=" + options.GOOS + ",GOARCH=" + options.GOARCH
 		if options.GOARCH == "arm" {
@@ -73,7 +74,6 @@ 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()
@@ -83,9 +83,8 @@ func testClangAttributes(t *testing.T, options *compileopts.Options) {
 		t.Fatalf("could not load target: %s", err)
 	}
 	config := compileopts.Config{
-		Options:      options,
-		Target:       target,
-		ClangHeaders: clangHeaderPath,
+		Options: options,
+		Target:  target,
 	}

 	// Create a very simple C input file.
@@ -97,7 +96,7 @@ 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()...)
+	flags := append([]string{"-c", "-emit-llvm", "-o", outpath, srcpath}, config.CFlags(false)...)
 	if config.GOOS() == "darwin" {
 		// Silence some warnings that happen when testing GOOS=darwin on
 		// something other than MacOS.
@@ -77,6 +77,15 @@ 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
@@ -88,16 +97,31 @@ 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
-		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
+		id, err := readRawGoBuildID(f, 4096)
+		if len(id) != 0 || err != nil {
+			return id, err
 		}
 	}
-	return nil, fmt.Errorf("could not find build ID in %s", executable)
+	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
 }
@@ -1,5 +1,12 @@
 //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.
@@ -21,8 +28,8 @@
 #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"
@@ -46,7 +53,6 @@
 #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"
@@ -55,7 +61,10 @@
 #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::driver;
@@ -103,6 +112,14 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
  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);
@@ -122,11 +139,12 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
    Opts.CompressDebugSections =
        llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
            .Case("none", llvm::DebugCompressionType::None)
-            .Case("zlib", llvm::DebugCompressionType::Z)
+            .Case("zlib", llvm::DebugCompressionType::Zlib)
+            .Case("zstd", llvm::DebugCompressionType::Zstd)
            .Default(llvm::DebugCompressionType::None);
  }

-  Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
+  Opts.RelaxELFRelocations = !Args.hasArg(OPT_mrelax_relocations_no);
  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);
@@ -141,8 +159,7 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,

  for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ)) {
    auto Split = StringRef(Arg).split('=');
-    Opts.DebugPrefixMap.insert(
-        {std::string(Split.first), std::string(Split.second)});
+    Opts.DebugPrefixMap.emplace_back(Split.first, Split.second);
  }

  // Frontend Options
@@ -189,6 +206,7 @@ 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));
@@ -214,6 +232,11 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
            .Case("default", EmitDwarfUnwindType::Default);
  }

+  Opts.EmitCompactUnwindNonCanonical =
+      Args.hasArg(OPT_femit_compact_unwind_non_canonical);
+
+  Opts.AsSecureLogFile = Args.getLastArgValue(OPT_as_secure_log_file);
+
  return Success;
 }

@@ -247,8 +270,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
      MemoryBuffer::getFileOrSTDIN(Opts.InputFile, /*IsText=*/true);

  if (std::error_code EC = Buffer.getError()) {
-    Error = EC.message();
-    return Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
+    return Diags.Report(diag::err_fe_error_reading)
+           << Opts.InputFile << EC.message();
  }

  SourceMgr SrcMgr;
@@ -265,6 +288,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,

  MCTargetOptions MCOptions;
  MCOptions.EmitDwarfUnwind = Opts.EmitDwarfUnwind;
+  MCOptions.EmitCompactUnwindNonCanonical = Opts.EmitCompactUnwindNonCanonical;
+  MCOptions.AsSecureLogFile = Opts.AsSecureLogFile;

  std::unique_ptr<MCAsmInfo> MAI(
      TheTarget->createMCAsmInfo(*MRI, Opts.Triple, MCOptions));
@@ -314,6 +339,8 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,
      TheTarget->createMCObjectFileInfo(Ctx, PIC));
  if (Opts.DarwinTargetVariantTriple)
    MOFI->setDarwinTargetVariantTriple(*Opts.DarwinTargetVariantTriple);
+  if (!Opts.DarwinTargetVariantSDKVersion.empty())
+    MOFI->setDarwinTargetVariantSDKVersion(Opts.DarwinTargetVariantSDKVersion);
  Ctx.setObjectFileInfo(MOFI.get());

  if (Opts.SaveTemporaryLabels)
@@ -353,6 +380,7 @@ static bool ExecuteAssemblerImpl(AssemblerInvocation &Opts,

  MCOptions.MCNoWarn = Opts.NoWarn;
  MCOptions.MCFatalWarnings = Opts.FatalWarnings;
+  MCOptions.MCNoTypeCheck = Opts.NoTypeCheck;
  MCOptions.ABIName = Opts.TargetABI;

  // FIXME: There is a bit of code duplication with addPassesToEmitFile.
@@ -1,3 +1,6 @@
+// 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.
@@ -44,7 +47,7 @@ struct AssemblerInvocation {
  std::string DwarfDebugFlags;
  std::string DwarfDebugProducer;
  std::string DebugCompilationDir;
-  std::map<const std::string, const std::string> DebugPrefixMap;
+  llvm::SmallVector<std::pair<std::string, std::string>, 0> DebugPrefixMap;
  llvm::DebugCompressionType CompressDebugSections =
      llvm::DebugCompressionType::None;
  std::string MainFileName;
@@ -82,12 +85,17 @@ struct AssemblerInvocation {
  unsigned NoExecStack : 1;
  unsigned FatalWarnings : 1;
  unsigned NoWarn : 1;
+  unsigned NoTypeCheck : 1;
  unsigned IncrementalLinkerCompatible : 1;
  unsigned EmbedBitcode : 1;

  /// Whether to emit DWARF unwind info.
  EmitDwarfUnwindType EmitDwarfUnwind;

+  // Whether to emit compact-unwind for non-canonical entries.
+  // Note: maybe overriden by other constraints.
+  unsigned EmitCompactUnwindNonCanonical : 1;
+
  /// The name of the relocation model to use.
  std::string RelocationModel;

@@ -97,7 +105,14 @@ struct AssemblerInvocation {

  /// Darwin target variant triple, the variant of the deployment target
  /// for which the code is being compiled.
-  llvm::Optional<llvm::Triple> DarwinTargetVariantTriple;
+  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;
  /// @}

 public:
@@ -114,11 +129,13 @@ public:
    NoExecStack = 0;
    FatalWarnings = 0;
    NoWarn = 0;
+    NoTypeCheck = 0;
    IncrementalLinkerCompatible = 0;
    Dwarf64 = 0;
    DwarfVersion = 0;
    EmbedBitcode = 0;
    EmitDwarfUnwind = EmitDwarfUnwindType::Default;
+    EmitCompactUnwindNonCanonical = false;
  }

  static bool CreateFromArgs(AssemblerInvocation &Res,
@@ -11,7 +11,7 @@
 #include <clang/FrontendTool/Utils.h>
 #include <llvm/ADT/IntrusiveRefCntPtr.h>
 #include <llvm/Option/Option.h>
-#include <llvm/Support/Host.h>
+#include <llvm/TargetParser/Host.h>

 using namespace llvm;
 using namespace clang;
@@ -1,7 +1,6 @@
 package builder

 import (
-	"errors"
 	"fmt"

 	"github.com/tinygo-org/tinygo/compileopts"
@@ -24,26 +23,20 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 		spec.OpenOCDCommands = options.OpenOCDCommands
 	}

-	goroot := goenv.Get("GOROOT")
-	if goroot == "" {
-		return nil, errors.New("cannot locate $GOROOT, please set it manually")
-	}
-
-	major, minor, err := goenv.GetGorootVersion(goroot)
+	major, minor, err := goenv.GetGorootVersion()
 	if err != nil {
-		return nil, fmt.Errorf("could not read version from GOROOT (%v): %v", goroot, err)
+		return nil, 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 major != 1 || minor < 18 || minor > 22 {
+		// 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 1.18 through 1.22, got go%d.%d", major, minor)
 	}

-	clangHeaderPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
-
 	return &compileopts.Config{
 		Options:        options,
 		Target:         spec,
 		GoMinorVersion: minor,
-		ClangHeaders:   clangHeaderPath,
 		TestConfig:     options.TestConfig,
 	}, nil
 }
@@ -1,105 +0,0 @@
-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 ""
-}
@@ -23,7 +23,7 @@ type espImageSegment struct {
 	data []byte
 }

-// makeESPFirmare converts an input ELF file to an image file for an ESP32 or
+// makeESPFirmareImage 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.
 //
@@ -134,7 +134,7 @@ func runJobs(job *compileJob, sema chan struct{}) error {
 		numRunningJobs--
 		<-sema
 		if jobRunnerDebug {
-			fmt.Println("## finished:", job.description, "(time "+job.duration.String()+")")
+			fmt.Println("## finished:", completed.description, "(time "+completed.duration.String()+")")
 		}
 		if completed.err != nil {
 			// Wait for any current jobs to finish.
@@ -143,6 +143,10 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	// 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="+target, "-fdebug-prefix-map="+dir+"="+remapDir)
+	resourceDir := goenv.ClangResourceDir(false)
+	if resourceDir != "" {
+		args = append(args, "-resource-dir="+resourceDir)
+	}
 	cpu := config.CPU()
 	if cpu != "" {
 		// X86 has deprecated the -mcpu flag, so we need to use -march instead.
@@ -178,12 +182,6 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	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

@@ -5,7 +5,11 @@
 #include <lld/Common/Driver.h>
 #include <llvm/Support/Parallel.h>

-extern "C" {
+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
@@ -16,28 +20,13 @@ static void configure() {
 #endif
 }

-bool tinygo_link_elf(int argc, char **argv) {
-	configure();
-	std::vector<const char*> args(argv, argv + argc);
-	return lld::elf::link(args, llvm::outs(), llvm::errs(), false, false);
-}
+extern "C" {

-bool tinygo_link_macho(int argc, char **argv) {
+bool tinygo_link(int argc, char **argv) {
 	configure();
 	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) {
-	configure();
-	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) {
-	configure();
-	std::vector<const char*> args(argv, argv + argc);
-	return lld::wasm::link(args, llvm::outs(), llvm::errs(), false, false);
+	lld::Result r = lld::lldMain(args, llvm::outs(), llvm::errs(), LLD_ALL_DRIVERS);
+	return !r.retCode;
 }

 } // external "C"
@@ -6,12 +6,10 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"strconv"
 	"strings"

 	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
-	"tinygo.org/x/go-llvm"
 )

 var Musl = Library{
@@ -93,6 +91,7 @@ var Musl = Library{
 			"-Wno-string-plus-int",
 			"-Wno-ignored-pragmas",
 			"-Wno-tautological-constant-out-of-range-compare",
+			"-Wno-deprecated-non-prototype",
 			"-Qunused-arguments",
 			// Select include dirs. Don't include standard library includes
 			// (that would introduce host dependencies and other complications),
@@ -106,11 +105,6 @@ var Musl = 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") },
@@ -125,6 +119,7 @@ var Musl = Library{
 			"internal/syscall_ret.c",
 			"internal/vdso.c",
 			"legacy/*.c",
+			"linux/*.c",
 			"malloc/*.c",
 			"malloc/mallocng/*.c",
 			"mman/*.c",
@@ -1,27 +1,117 @@
 package builder

 import (
-	"fmt"
-	"io"
-	"os/exec"
+	"archive/zip"
+	"bytes"
+	"encoding/binary"
+	"encoding/json"
+	"os"

+	"github.com/sigurn/crc16"
 	"github.com/tinygo-org/tinygo/compileopts"
 )

-// https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrfutil%2FUG%2Fnrfutil%2Fnrfutil_intro.html
-
-func makeDFUFirmwareImage(options *compileopts.Options, infile, outfile string) error {
-	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:]...)
-	}
-
-	cmd := exec.Command(cmdLine[0], cmdLine[1:]...)
-	cmd.Stdout = io.Discard
-	err := cmd.Run()
-	if err != nil {
-		return fmt.Errorf("could not run nrfutil pkg generate: %w", err)
-	}
-	return nil
+// 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"`
+}
+
+// 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
+	}
+
+	// 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")
+	if err != nil {
+		return 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)
 }
@@ -3,6 +3,7 @@ package builder
 import (
 	"os"
 	"path/filepath"
+	"strings"

 	"github.com/tinygo-org/tinygo/goenv"
 )
@@ -41,91 +42,23 @@ var Picolibc = Library{
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib") },
 	librarySources: func(target string) ([]string, error) {
-		return picolibcSources, nil
+		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
 	},
 }

 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",
@@ -229,6 +162,87 @@ 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",
@@ -323,6 +337,12 @@ var picolibcSources = []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",
@@ -41,9 +41,9 @@ func TestBinarySize(t *testing.T) {
 	// This is a small number of very diverse targets that we want to test.
 	tests := []sizeTest{
 		// microcontrollers
-		{"hifive1b", "examples/echo", 4556, 272, 0, 2252},
-		{"microbit", "examples/serial", 2680, 380, 8, 2256},
-		{"wioterminal", "examples/pininterrupt", 6109, 1471, 116, 6816},
+		{"hifive1b", "examples/echo", 4476, 280, 0, 2252},
+		{"microbit", "examples/serial", 2724, 388, 8, 2256},
+		{"wioterminal", "examples/pininterrupt", 5996, 1484, 116, 6816},

 		// TODO: also check wasm. Right now this is difficult, because
 		// wasm binaries are run through wasm-opt and therefore the
@@ -12,10 +12,7 @@ import (
 #include <stdbool.h>
 #include <stdlib.h>
 bool tinygo_clang_driver(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);
+bool tinygo_link(int argc, char **argv);
 */
 import "C"

@@ -26,16 +23,7 @@ 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 {
-	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...)
+	args = append([]string{tool}, args...)

 	var cflag *C.char
 	buf := C.calloc(C.size_t(len(args)), C.size_t(unsafe.Sizeof(cflag)))
@@ -51,19 +39,8 @@ 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":
-		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))
+	case "ld.lld", "wasm-ld":
+		ok = C.tinygo_link(C.int(len(args)), (**C.char)(buf))
 	default:
 		return errors.New("unknown tool: " + tool)
 	}
@@ -1,7 +1,6 @@
 package builder

 import (
-	"errors"
 	"os"
 	"os/exec"

@@ -12,11 +11,6 @@ import (
 func runCCompiler(flags ...string) error {
 	if hasBuiltinTools {
 		// Compile this with the internal Clang compiler.
-		headerPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
-		if headerPath == "" {
-			return errors.New("could not locate Clang headers")
-		}
-		flags = append(flags, "-I"+headerPath)
 		cmd := exec.Command(os.Args[0], append([]string{"clang"}, flags...)...)
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
@@ -25,9 +25,15 @@ import (
 	"golang.org/x/tools/go/ast/astutil"
 )

+// Function that's only defined in Go 1.22.
+var setASTFileFields = func(f *ast.File, start, end token.Pos) {
+}
+
 // 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
@@ -88,6 +94,7 @@ var cgoAliases = map[string]string{
 	"C.uintptr_t": "uintptr",
 	"C.float":     "float32",
 	"C.double":    "float64",
+	"C._Bool":     "bool",
 }

 // builtinAliases are handled specially because they only exist on the Go side
@@ -164,8 +171,9 @@ func GoBytes(ptr unsafe.Pointer, length C.int) []byte {
 // 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, clangHeaders string) (*ast.File, []string, []string, []string, map[string][]byte, []error) {
+func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cflags []string) ([]*ast.File, []string, []string, []string, map[string][]byte, []error) {
 	p := &cgoPackage{
+		packageName:     files[0].Name.Name,
 		currentDir:      dir,
 		importPath:      importPath,
 		fset:            fset,
@@ -201,6 +209,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 		// 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
@@ -291,9 +300,6 @@ 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) {
@@ -311,10 +317,11 @@ 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)
-		// Float and double are aliased, meaning that C.float is the same thing
-		// as float32 in Go.
+		// These types are aliased with the corresponding types in C. For
+		// example, float in C is always 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) {
@@ -333,7 +340,7 @@ func Process(files []*ast.File, dir, importPath string, fset *token.FileSet, cfl
 	// Print the newly generated in-memory AST, for debugging.
 	//ast.Print(fset, p.generated)

-	return p.generated, p.cgoHeaders, p.cflags, p.ldflags, p.visitedFiles, p.errors
+	return p.cgoFiles, p.cgoHeaders, p.cflags, p.ldflags, p.visitedFiles, p.errors
 }

 func (p *cgoPackage) newCGoFile(file *ast.File, index int) *cgoFile {
@@ -0,0 +1,17 @@
+//go:build go1.22
+
+package cgo
+
+// Code specifically for Go 1.22.
+
+import (
+	"go/ast"
+	"go/token"
+)
+
+func init() {
+	setASTFileFields = func(f *ast.File, start, end token.Pos) {
+		f.FileStart = start
+		f.FileEnd = end
+	}
+}
@@ -55,7 +55,7 @@ func TestCGo(t *testing.T) {
 			}

 			// Process the AST with CGo.
-			cgoAST, _, _, _, _, cgoErrors := Process([]*ast.File{f}, "testdata", "main", fset, cflags, "")
+			cgoFiles, _, _, _, _, cgoErrors := Process([]*ast.File{f}, "testdata", "main", fset, cflags)

 			// Check the AST for type errors.
 			var typecheckErrors []error
@@ -66,7 +66,7 @@ func TestCGo(t *testing.T) {
 				Importer: simpleImporter{},
 				Sizes:    types.SizesFor("gccgo", "arm"),
 			}
-			_, err = config.Check("", fset, []*ast.File{f, cgoAST}, nil)
+			_, err = config.Check("", fset, append([]*ast.File{f}, cgoFiles...), 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, cgoAST)
+			err = format.Node(buf, fset, cgoFiles[0])
 			if err != nil {
 				t.Errorf("could not write out CGo AST: %v", err)
 			}
@@ -60,6 +60,7 @@ 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);

 int tinygo_clang_globals_visitor(GoCXCursor c, GoCXCursor parent, CXClientData client_data);
@@ -588,6 +589,13 @@ 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),
+		}
+		setASTFileFields(astFile, f.Pos(0), f.Pos(int(size)))
+		p.cgoFiles = append(p.cgoFiles, astFile)
 	}
 	positionFile := p.tokenFiles[filename]

@@ -653,8 +661,19 @@ 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(typ)
+		c := C.tinygo_clang_getTypeDeclaration(underlyingType)
 		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
@@ -788,6 +807,8 @@ 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))
@@ -806,7 +827,7 @@ func (f *cgoFile) makeASTType(typ C.CXType, pos token.Pos) ast.Expr {
 			// makeASTRecordType will create an appropriate error.
 			cgoRecordPrefix = "record_"
 		}
-		if name == "" {
+		if name == "" || C.tinygo_clang_Cursor_isAnonymous(cursor) != 0 {
 			// Anonymous record, probably inside a typedef.
 			location := f.getUniqueLocationID(pos, cursor)
 			name = f.getUnnamedDeclName("_Ctype_"+cgoRecordPrefix+"__", location)
@@ -1,15 +0,0 @@
-//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"
@@ -1,4 +1,4 @@
-//go:build !byollvm && !llvm14
+//go:build !byollvm && llvm15

 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 -lffi
-#cgo darwin,arm64 LDFLAGS: -L/opt/homebrew/opt/llvm@15/lib -lclang -lffi
+#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 freebsd      LDFLAGS: -L/usr/local/llvm15/lib -lclang
 */
 import "C"
@@ -0,0 +1,21 @@
+//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"
@@ -0,0 +1,15 @@
+//go:build !byollvm && !llvm15 && !llvm16
+
+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"
@@ -77,6 +77,10 @@ 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);
-}
+}
@@ -142,6 +142,7 @@ 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=([^@\-].*)`),
@@ -108,6 +108,7 @@ var goodLinkerFlags = [][]string{
 	{"-Fbar"},
 	{"-lbar"},
 	{"-Lbar"},
+	{"--export=my_symbol"},
 	{"-fpic"},
 	{"-fno-pic"},
 	{"-fPIC"},
@@ -51,10 +51,10 @@ type (
 	C.longlong  int64
 	C.ulonglong uint64
 )
-type C._Ctype_struct___0 struct {
+type C.struct_point_t struct {
 	x C.int
 	y C.int
 }
-type C.point_t = C._Ctype_struct___0
+type C.point_t = C.struct_point_t

 const C.SOME_CONST_3 = 1234
@@ -38,11 +38,11 @@ type (
 	C.ulonglong uint64
 )
 type C.myint = C.int
-type C._Ctype_struct___0 struct {
+type C.struct_point2d_t struct {
 	x C.int
 	y C.int
 }
-type C.point2d_t = C._Ctype_struct___0
+type C.point2d_t = C.struct_point2d_t
 type C.struct_point3d struct {
 	x C.int
 	y C.int
@@ -55,21 +55,19 @@ type C.struct_type1 struct {
 	___type C.int
 }
 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 }
+type C.union_union1_t struct{ i C.int }
+type C.union1_t = C.union_union1_t
+type C.union_union3_t struct{ $union uint64 }

-func (union *C._Ctype_union___2) unionfield_i() *C.int {
-	return (*C.int)(unsafe.Pointer(&union.$union))
-}
-func (union *C._Ctype_union___2) unionfield_d() *float64 {
+func (union *C.union_union3_t) unionfield_i() *C.int { return (*C.int)(unsafe.Pointer(&union.$union)) }
+func (union *C.union_union3_t) unionfield_d() *float64 {
 	return (*float64)(unsafe.Pointer(&union.$union))
 }
-func (union *C._Ctype_union___2) unionfield_s() *C.short {
+func (union *C.union_union3_t) unionfield_s() *C.short {
 	return (*C.short)(unsafe.Pointer(&union.$union))
 }

-type C.union3_t = C._Ctype_union___2
+type C.union3_t = C.union_union3_t
 type C.union_union2d struct{ $union [2]uint64 }

 func (union *C.union_union2d) unionfield_i() *C.int { return (*C.int)(unsafe.Pointer(&union.$union)) }
@@ -78,50 +76,50 @@ func (union *C.union_union2d) unionfield_d() *[2]float64 {
 }

 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 }
+type C.union_unionarray_t struct{ arr [10]C.uchar }
+type C.unionarray_t = C.union_unionarray_t
+type C._Ctype_union___0 struct{ $union [3]uint32 }

-func (union *C._Ctype_union___5) unionfield_area() *C.point2d_t {
+func (union *C._Ctype_union___0) unionfield_area() *C.point2d_t {
 	return (*C.point2d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *C._Ctype_union___5) unionfield_solid() *C.point3d_t {
+func (union *C._Ctype_union___0) unionfield_solid() *C.point3d_t {
 	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
 }

-type C._Ctype_struct___4 struct {
+type C.struct_struct_nested_t struct {
 	begin C.point2d_t
 	end   C.point2d_t
 	tag   C.int

-	coord C._Ctype_union___5
+	coord C._Ctype_union___0
 }
-type C.struct_nested_t = C._Ctype_struct___4
-type C._Ctype_union___6 struct{ $union [2]uint64 }
+type C.struct_nested_t = C.struct_struct_nested_t
+type C.union_union_nested_t struct{ $union [2]uint64 }

-func (union *C._Ctype_union___6) unionfield_point() *C.point3d_t {
+func (union *C.union_union_nested_t) unionfield_point() *C.point3d_t {
 	return (*C.point3d_t)(unsafe.Pointer(&union.$union))
 }
-func (union *C._Ctype_union___6) unionfield_array() *C.unionarray_t {
+func (union *C.union_union_nested_t) unionfield_array() *C.unionarray_t {
 	return (*C.unionarray_t)(unsafe.Pointer(&union.$union))
 }
-func (union *C._Ctype_union___6) unionfield_thing() *C.union3_t {
+func (union *C.union_union_nested_t) unionfield_thing() *C.union3_t {
 	return (*C.union3_t)(unsafe.Pointer(&union.$union))
 }

-type C.union_nested_t = C._Ctype_union___6
+type C.union_nested_t = C.union_union_nested_t
 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 {
+type C.enum_option2_t = C.uint
+type C.option2_t = C.enum_option2_t
+type C.struct_types_t struct {
 	f   float32
 	d   float64
 	ptr *C.int
 }
-type C.types_t = C._Ctype_struct___8
+type C.types_t = C.struct_types_t
 type C.myIntArray = [10]C.int
-type C._Ctype_struct___9 struct {
+type C.struct_bitfield_t struct {
 	start        C.uchar
 	__bitfield_1 C.uchar

@@ -129,21 +127,21 @@ type C._Ctype_struct___9 struct {
 	e C.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) {
+func (s *C.struct_bitfield_t) bitfield_a() C.uchar { return s.__bitfield_1 & 0x1f }
+func (s *C.struct_bitfield_t) set_bitfield_a(value C.uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x1f | value&0x1f<<0
 }
-func (s *C._Ctype_struct___9) bitfield_b() C.uchar {
+func (s *C.struct_bitfield_t) bitfield_b() C.uchar {
 	return s.__bitfield_1 >> 5 & 0x1
 }
-func (s *C._Ctype_struct___9) set_bitfield_b(value C.uchar) {
+func (s *C.struct_bitfield_t) set_bitfield_b(value C.uchar) {
 	s.__bitfield_1 = s.__bitfield_1&^0x20 | value&0x1<<5
 }
-func (s *C._Ctype_struct___9) bitfield_c() C.uchar {
+func (s *C.struct_bitfield_t) bitfield_c() C.uchar {
 	return s.__bitfield_1 >> 6
 }
-func (s *C._Ctype_struct___9) set_bitfield_c(value C.uchar,
+func (s *C.struct_bitfield_t) set_bitfield_c(value C.uchar,

 ) { s.__bitfield_1 = s.__bitfield_1&0x3f | value<<6 }

-type C.bitfield_t = C._Ctype_struct___9
+type C.bitfield_t = C.struct_bitfield_t
@@ -19,7 +19,6 @@ type Config struct {
 	Options        *Options
 	Target         *TargetSpec
 	GoMinorVersion int
-	ClangHeaders   string // Clang built-in header include path
 	TestConfig     TestConfig
 }

@@ -75,8 +74,12 @@ func (c *Config) GOARM() string {

 // BuildTags returns the complete list of build tags used during this build.
 func (c *Config) BuildTags() []string {
-	targetTags := filterTags(c.Target.BuildTags, c.Options.Tags)
-	tags := append(targetTags, []string{"tinygo", "math_big_pure_go", "gc." + c.GC(), "scheduler." + c.Scheduler(), "serial." + c.Serial()}...)
+	tags := append(c.Target.BuildTags, []string{
+		"tinygo",                                     // that's the compiler
+		"purego",                                     // to get various crypto packages 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
 	for i := 1; i <= c.GoMinorVersion; i++ {
 		tags = append(tags, fmt.Sprintf("go1.%d", i))
 	}
@@ -84,12 +87,6 @@ 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 {
@@ -146,18 +143,18 @@ 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) OptLevels() (optLevel, sizeLevel int, inlinerThreshold uint) {
+func (c *Config) OptLevel() (level string, speedLevel, sizeLevel int) {
 	switch c.Options.Opt {
 	case "none", "0":
-		return 0, 0, 0 // -O0
+		return "O0", 0, 0
 	case "1":
-		return 1, 0, 0 // -O1
+		return "O1", 1, 0
 	case "2":
-		return 2, 0, 225 // -O2
+		return "O2", 2, 0
 	case "s":
-		return 2, 1, 225 // -Os
+		return "Os", 2, 1
 	case "z":
-		return 2, 2, 5 // -Oz, default
+		return "Oz", 2, 2 // 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.
@@ -191,6 +188,15 @@ 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() > 32*1024 {
+		return 1024
+	}
+
+	return 256
+}
+
 // RP2040BootPatch returns whether the RP2040 boot patch should be applied that
 // calculates and patches in the checksum for the 2nd stage bootloader.
 func (c *Config) RP2040BootPatch() bool {
@@ -260,24 +266,35 @@ 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() []string {
+func (c *Config) CFlags(libclang bool) []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).
+		cflags = append(cflags,
+			"-resource-dir="+resourceDir,
+		)
+	}
 	switch c.Target.Libc {
 	case "darwin-libSystem":
 		root := goenv.Get("TINYGOROOT")
 		cflags = append(cflags,
-			"--sysroot="+filepath.Join(root, "lib/macos-minimal-sdk/src"),
+			"-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.LibcPath("picolibc")
 		cflags = append(cflags,
-			"--sysroot="+path,
-			"-isystem", filepath.Join(path, "include"), // necessary for Xtensa
+			"-nostdlibinc",
+			"-isystem", filepath.Join(path, "include"),
 			"-isystem", filepath.Join(picolibcDir, "include"),
 			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
 		)
@@ -298,7 +315,8 @@ func (c *Config) CFlags() []string {
 		root := goenv.Get("TINYGOROOT")
 		path, _ := c.LibcPath("mingw-w64")
 		cflags = append(cflags,
-			"--sysroot="+path,
+			"-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", "defaults", "include"),
 			"-D_UCRT",
@@ -493,11 +511,6 @@ 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 {
@@ -545,32 +558,10 @@ type TestConfig struct {
 	Verbose           bool
 	Short             bool
 	RunRegexp         string
+	SkipRegexp        string
 	Count             *int
 	BenchRegexp       string
 	BenchTime         string
 	BenchMem          bool
-}
-
-// filterTags removes predefined build tags for a target if a conflicting option
-// is provided by the user.
-func filterTags(targetTags []string, userTags []string) []string {
-	var filtered []string
-	for _, t := range targetTags {
-		switch {
-		case strings.HasPrefix(t, "runtime_memhash_"):
-			overridden := false
-			for _, ut := range userTags {
-				if strings.HasPrefix(ut, "runtime_memhash_") {
-					overridden = true
-					break
-				}
-			}
-			if !overridden {
-				filtered = append(filtered, t)
-			}
-		default:
-			filtered = append(filtered, t)
-		}
-	}
-	return filtered
+	Shuffle           string
 }
@@ -1,132 +0,0 @@
-package compileopts
-
-import (
-	"fmt"
-	"strings"
-	"testing"
-)
-
-func TestBuildTags(t *testing.T) {
-	tests := []struct {
-		targetTags []string
-		userTags   []string
-		result     []string
-	}{
-		{
-			targetTags: []string{},
-			userTags:   []string{},
-			result: []string{
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-			},
-		},
-		{
-			targetTags: []string{"bear"},
-			userTags:   []string{},
-			result: []string{
-				"bear",
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-			},
-		},
-		{
-			targetTags: []string{},
-			userTags:   []string{"cat"},
-			result: []string{
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-				"cat",
-			},
-		},
-		{
-			targetTags: []string{"bear"},
-			userTags:   []string{"cat"},
-			result: []string{
-				"bear",
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-				"cat",
-			},
-		},
-		{
-			targetTags: []string{"bear", "runtime_memhash_leveldb"},
-			userTags:   []string{"cat"},
-			result: []string{
-				"bear",
-				"runtime_memhash_leveldb",
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-				"cat",
-			},
-		},
-		{
-			targetTags: []string{"bear", "runtime_memhash_leveldb"},
-			userTags:   []string{"cat", "runtime_memhash_leveldb"},
-			result: []string{
-				"bear",
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-				"cat",
-				"runtime_memhash_leveldb",
-			},
-		},
-		{
-			targetTags: []string{"bear", "runtime_memhash_leveldb"},
-			userTags:   []string{"cat", "runtime_memhash_sip"},
-			result: []string{
-				"bear",
-				"tinygo",
-				"math_big_pure_go",
-				"gc.conservative",
-				"scheduler.none",
-				"serial.none",
-				"cat",
-				"runtime_memhash_sip",
-			},
-		},
-	}
-
-	for _, tc := range tests {
-		tt := tc
-		t.Run(fmt.Sprintf("%s+%s", strings.Join(tt.targetTags, ","), strings.Join(tt.userTags, ",")), func(t *testing.T) {
-			c := &Config{
-				Target: &TargetSpec{
-					BuildTags: tt.targetTags,
-				},
-				Options: &Options{
-					Tags: tt.userTags,
-				},
-			}
-
-			res := c.BuildTags()
-
-			if len(res) != len(tt.result) {
-				t.Errorf("expected %d tags, got %d", len(tt.result), len(res))
-			}
-
-			for i, tag := range tt.result {
-				if tag != res[i] {
-					t.Errorf("tag %d: expected %s, got %s", i, tt.result[i], tag)
-				}
-			}
-		})
-	}
-}
@@ -10,7 +10,7 @@ import (
 var (
 	validGCOptions            = []string{"none", "leaking", "conservative", "custom", "precise"}
 	validSchedulerOptions     = []string{"none", "tasks", "asyncify"}
-	validSerialOptions        = []string{"none", "uart", "usb"}
+	validSerialOptions        = []string{"none", "uart", "usb", "rtt"}
 	validPrintSizeOptions     = []string{"none", "short", "full"}
 	validPanicStrategyOptions = []string{"print", "trap"}
 	validOptOptions           = []string{"none", "0", "1", "2", "s", "z"}
@@ -23,6 +23,7 @@ type Options struct {
 	GOOS            string // environment variable
 	GOARCH          string // environment variable
 	GOARM           string // environment variable (only used with GOARCH=arm)
+	Directory       string // working dir, leave it unset to use the current working dir
 	Target          string
 	Opt             string
 	GC              string
@@ -35,6 +36,7 @@ type Options struct {
 	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
@@ -47,7 +49,6 @@ type Options struct {
 	Programmer      string
 	OpenOCDCommands []string
 	LLVMFeatures    string
-	Directory       string
 	PrintJSON       bool
 	Monitor         bool
 	BaudRate        int
@@ -23,46 +23,45 @@ 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"`
-	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"`
+	Inherits         []string `json:"inherits,omitempty"`
+	Triple           string   `json:"llvm-target,omitempty"`
+	CPU              string   `json:"cpu,omitempty"`
+	ABI              string   `json:"target-abi,omitempty"` // rougly equivalent to -mabi= flag
+	Features         string   `json:"features,omitempty"`
+	GOOS             string   `json:"goos,omitempty"`
+	GOARCH           string   `json:"goarch,omitempty"`
+	BuildTags        []string `json:"build-tags,omitempty"`
+	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"`
+	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
+	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"`
+	CodeModel        string   `json:"code-model,omitempty"`
+	RelocationModel  string   `json:"relocation-model,omitempty"`
 }

 // overrideProperties overrides all properties that are set in child into itself using reflection.
@@ -192,12 +191,15 @@ func LoadTarget(options *Options) (*TargetSpec, error) {
 			default:
 				return nil, fmt.Errorf("invalid GOARM=%s, must be 5, 6, or 7", options.GOARM)
 			}
+		case "wasm":
+			llvmarch = "wasm32"
 		default:
 			llvmarch = options.GOARCH
 		}
 		llvmvendor := "unknown"
 		llvmos := options.GOOS
-		if llvmos == "darwin" {
+		switch llvmos {
+		case "darwin":
 			// Use macosx* instead of darwin, otherwise darwin/arm64 will refer
 			// to iOS!
 			llvmos = "macosx10.12.0"
@@ -208,6 +210,8 @@ func LoadTarget(options *Options) (*TargetSpec, error) {
 				llvmos = "macosx11.0.0"
 			}
 			llvmvendor = "apple"
+		case "wasip1":
+			llvmos = "wasi"
 		}
 		// Target triples (which actually have four components, but are called
 		// triples for historical reasons) have the form:
@@ -242,6 +246,43 @@ 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.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
+}
+
 func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
 	// No target spec available. Use the default one, useful on most systems
 	// with a regular OS.
@@ -260,10 +301,10 @@ func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
 	switch goarch {
 	case "386":
 		spec.CPU = "pentium4"
-		spec.Features = "+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
+		spec.Features = "+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
 	case "amd64":
 		spec.CPU = "x86-64"
-		spec.Features = "+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
+		spec.Features = "+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"
 	case "arm":
 		spec.CPU = "generic"
 		spec.CFlags = append(spec.CFlags, "-fno-unwind-tables", "-fno-asynchronous-unwind-tables")
@@ -277,7 +318,22 @@ func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
 		}
 	case "arm64":
 		spec.CPU = "generic"
-		spec.Features = "+neon"
+		if goos == "darwin" {
+			spec.Features = "+neon"
+		} else if goos == "windows" {
+			spec.Features = "+neon,-fmv"
+		} else { // linux
+			spec.Features = "+neon,-fmv,-outline-atomics"
+		}
+	case "wasm":
+		spec.CPU = "generic"
+		spec.Features = "+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext"
+		spec.BuildTags = append(spec.BuildTags, "tinygo.wasm")
+		spec.CFlags = append(spec.CFlags,
+			"-mbulk-memory",
+			"-mnontrapping-fptoint",
+			"-msign-ext",
+		)
 	}
 	if goos == "darwin" {
 		spec.Linker = "ld.lld"
@@ -295,6 +351,20 @@ func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
 		spec.RTLib = "compiler-rt"
 		spec.Libc = "musl"
 		spec.LDFlags = append(spec.LDFlags, "--gc-sections")
+		if 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")
+		}
 	} else if goos == "windows" {
 		spec.Linker = "ld.lld"
 		spec.Libc = "mingw-w64"
@@ -321,6 +391,22 @@ func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
 			"--no-insert-timestamp",
 			"--no-dynamicbase",
 		)
+	} else if goos == "wasip1" {
+		spec.GC = "" // use default GC
+		spec.Scheduler = "asyncify"
+		spec.Linker = "wasm-ld"
+		spec.RTLib = "compiler-rt"
+		spec.Libc = "wasi-libc"
+		spec.DefaultStackSize = 1024 * 64 // 64kB
+		spec.LDFlags = append(spec.LDFlags,
+			"--stack-first",
+			"--no-demangle",
+		)
+		spec.Emulator = "wasmtime --dir={tmpDir}::/tmp {}"
+		spec.ExtraFiles = append(spec.ExtraFiles,
+			"src/runtime/asm_tinygowasm.S",
+			"src/internal/task/task_asyncify_wasm.S",
+		)
 	} else {
 		spec.LDFlags = append(spec.LDFlags, "-no-pie", "-Wl,--gc-sections") // WARNING: clang < 5.0 requires -nopie
 	}
@@ -35,17 +35,7 @@ func (b *builder) createAtomicOp(name string) llvm.Value {
 	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))
-		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))
@@ -63,24 +53,6 @@ func (b *builder) createAtomicOp(name string) llvm.Value {
 	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))
-		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
@@ -36,12 +36,16 @@ const (
 // 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 {
-	fn := b.program.ImportedPackage("runtime").Members[fnName].(*ssa.Function)
+	member := b.program.ImportedPackage("runtime").Members[fnName]
+	if member == nil {
+		panic("unknown runtime call: " + fnName)
+	}
+	fn := member.(*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.i8ptrType)) // unused context parameter
+	args = append(args, llvm.Undef(b.dataPtrType)) // unused context parameter
 	if isInvoke {
 		return b.createInvoke(fnType, llvmFn, args, name)
 	}
@@ -229,7 +233,7 @@ func extractSubfield(t types.Type, field int) types.Type {
 	}
 }

-// flattenAggregateTypeOffset returns the offsets from the start of an object of
+// flattenAggregateTypeOffsets 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.
@@ -33,28 +33,27 @@ func (b *builder) createChanSend(instr *ssa.Send) {
 	// store value-to-send
 	valueType := b.getLLVMType(instr.X.Type())
 	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var valueAlloca, valueAllocaCast, valueAllocaSize llvm.Value
+	var valueAlloca, valueAllocaSize llvm.Value
 	if isZeroSize {
-		valueAlloca = llvm.ConstNull(llvm.PointerType(valueType, 0))
-		valueAllocaCast = llvm.ConstNull(b.i8ptrType)
+		valueAlloca = llvm.ConstNull(b.dataPtrType)
 	} else {
-		valueAlloca, valueAllocaCast, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
+		valueAlloca, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
 		b.CreateStore(chanValue, valueAlloca)
 	}

 	// Allocate blockedlist buffer.
 	channelBlockedList := b.getLLVMRuntimeType("channelBlockedList")
-	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")
+	channelBlockedListAlloca, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")

 	// Do the send.
-	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")
+	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAlloca, 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(channelBlockedListAllocaCast, channelBlockedListAllocaSize)
+	b.emitLifetimeEnd(channelBlockedListAlloca, channelBlockedListAllocaSize)
 	if !isZeroSize {
-		b.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)
+		b.emitLifetimeEnd(valueAlloca, valueAllocaSize)
 	}
 }

@@ -66,28 +65,27 @@ func (b *builder) createChanRecv(unop *ssa.UnOp) llvm.Value {

 	// Allocate memory to receive into.
 	isZeroSize := b.targetData.TypeAllocSize(valueType) == 0
-	var valueAlloca, valueAllocaCast, valueAllocaSize llvm.Value
+	var valueAlloca, valueAllocaSize llvm.Value
 	if isZeroSize {
-		valueAlloca = llvm.ConstNull(llvm.PointerType(valueType, 0))
-		valueAllocaCast = llvm.ConstNull(b.i8ptrType)
+		valueAlloca = llvm.ConstNull(b.dataPtrType)
 	} else {
-		valueAlloca, valueAllocaCast, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
+		valueAlloca, valueAllocaSize = b.createTemporaryAlloca(valueType, "chan.value")
 	}

 	// Allocate blockedlist buffer.
 	channelBlockedList := b.getLLVMRuntimeType("channelBlockedList")
-	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")
+	channelBlockedListAlloca, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")

 	// Do the receive.
-	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")
+	commaOk := b.createRuntimeCall("chanRecv", []llvm.Value{ch, valueAlloca, 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(valueAlloca, valueAllocaSize)
 	}
-	b.emitLifetimeEnd(channelBlockedListAllocaCast, channelBlockedListAllocaSize)
+	b.emitLifetimeEnd(channelBlockedListAlloca, channelBlockedListAllocaSize)

 	if unop.CommaOk {
 		tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{valueType, b.ctx.Int1Type()}, false))
@@ -159,8 +157,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 			sendValue := b.getValue(state.Send, state.Pos)
 			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, "")
+			selectState = b.CreateInsertValue(selectState, alloca, 1, "")
 		default:
 			panic("unreachable")
 		}
@@ -168,10 +165,10 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	}

 	// Create a receive buffer, where the received value will be stored.
-	recvbuf := llvm.Undef(b.i8ptrType)
+	recvbuf := llvm.Undef(b.dataPtrType)
 	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),
@@ -181,7 +178,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {

 	// Create the states slice (allocated on the stack).
 	statesAllocaType := llvm.ArrayType(chanSelectStateType, len(selectStates))
-	statesAlloca, statesI8, statesSize := b.createTemporaryAlloca(statesAllocaType, "select.states.alloca")
+	statesAlloca, 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{
@@ -202,7 +199,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		// Stack-allocate operation structures.
 		// If these were simply created as a slice, they would heap-allocate.
 		chBlockAllocaType := llvm.ArrayType(b.getLLVMRuntimeType("channelBlockedList"), len(selectStates))
-		chBlockAlloca, chBlockAllocaPtr, chBlockSize := b.createTemporaryAlloca(chBlockAllocaType, "select.block.alloca")
+		chBlockAlloca, 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),
@@ -216,7 +213,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		}, "select.result")

 		// Terminate the lifetime of the operation structures.
-		b.emitLifetimeEnd(chBlockAllocaPtr, chBlockSize)
+		b.emitLifetimeEnd(chBlockAlloca, chBlockSize)
 	} else {
 		results = b.createRuntimeCall("tryChanSelect", []llvm.Value{
 			recvbuf,
@@ -225,7 +222,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 	}

 	// Terminate the lifetime of the states alloca.
-	b.emitLifetimeEnd(statesI8, statesSize)
+	b.emitLifetimeEnd(statesAlloca, statesSize)

 	// The result value does not include all the possible received values,
 	// because we can't load them in advance. Instead, the *ssa.Extract
@@ -265,7 +262,6 @@ func (b *builder) getChanSelectResult(expr *ssa.Extract) llvm.Value {
 		// it to the correct type, and dereference it.
 		recvbuf := b.selectRecvBuf[expr.Tuple.(*ssa.Select)]
 		typ := b.getLLVMType(expr.Type())
-		ptr := b.CreateBitCast(recvbuf, llvm.PointerType(typ, 0), "")
-		return b.CreateLoad(typ, ptr, "")
+		return b.CreateLoad(typ, recvbuf, "")
 	}
 }
@@ -53,6 +53,7 @@ type Config struct {
 	Scheduler          string
 	AutomaticStackSize bool
 	DefaultStackSize   uint64
+	MaxStackAlloc      uint64
 	NeedsStackObjects  bool
 	Debug              bool // Whether to emit debug information in the LLVM module.
 }
@@ -75,13 +76,13 @@ type compilerContext struct {
 	machine          llvm.TargetMachine
 	targetData       llvm.TargetData
 	intType          llvm.Type
-	i8ptrType        llvm.Type // for convenience
-	rawVoidFuncType  llvm.Type // for convenience
+	dataPtrType      llvm.Type // pointer in address space 0
+	funcPtrType      llvm.Type // pointer in function address space (1 for AVR, 0 elsewhere)
 	funcPtrAddrSpace int
-	hasTypedPointers bool // for LLVM 14 backwards compatibility
 	uintptrType      llvm.Type
 	program          *ssa.Program
 	diagnostics      []error
+	functionInfos    map[*ssa.Function]functionInfo
 	astComments      map[string]*ast.CommentGroup
 	embedGlobals     map[string][]*loader.EmbedFile
 	pkg              *types.Package
@@ -93,13 +94,14 @@ type compilerContext struct {
 // importantly with a newly created LLVM context and module.
 func newCompilerContext(moduleName string, machine llvm.TargetMachine, config *Config, dumpSSA bool) *compilerContext {
 	c := &compilerContext{
-		Config:      config,
-		DumpSSA:     dumpSSA,
-		difiles:     make(map[string]llvm.Metadata),
-		ditypes:     make(map[types.Type]llvm.Metadata),
-		machine:     machine,
-		targetData:  machine.CreateTargetData(),
-		astComments: map[string]*ast.CommentGroup{},
+		Config:        config,
+		DumpSSA:       dumpSSA,
+		difiles:       make(map[string]llvm.Metadata),
+		ditypes:       make(map[types.Type]llvm.Metadata),
+		machine:       machine,
+		targetData:    machine.CreateTargetData(),
+		functionInfos: map[*ssa.Function]functionInfo{},
+		astComments:   map[string]*ast.CommentGroup{},
 	}

 	c.ctx = llvm.NewContext()
@@ -121,13 +123,12 @@ func newCompilerContext(moduleName string, machine llvm.TargetMachine, config *C
 	} else {
 		panic("unknown pointer size")
 	}
-	c.i8ptrType = llvm.PointerType(c.ctx.Int8Type(), 0)
+	c.dataPtrType = llvm.PointerType(c.ctx.Int8Type(), 0)

 	dummyFuncType := llvm.FunctionType(c.ctx.VoidType(), nil, false)
 	dummyFunc := llvm.AddFunction(c.mod, "tinygo.dummy", dummyFuncType)
 	c.funcPtrAddrSpace = dummyFunc.Type().PointerAddressSpace()
-	c.hasTypedPointers = c.i8ptrType != llvm.PointerType(c.ctx.Int16Type(), 0) // with opaque pointers, all pointers are the same type (LLVM 15+)
-	c.rawVoidFuncType = dummyFunc.Type()
+	c.funcPtrType = dummyFunc.Type()
 	dummyFunc.EraseFromParentAsFunction()

 	return c
@@ -167,6 +168,8 @@ type builder struct {
 	deferExprFuncs    map[ssa.Value]int
 	selectRecvBuf     map[*ssa.Select]llvm.Value
 	deferBuiltinFuncs map[ssa.Value]deferBuiltin
+	runDefersBlock    []llvm.BasicBlock
+	afterDefersBlock  []llvm.BasicBlock
 }

 func newBuilder(c *compilerContext, irbuilder llvm.Builder, f *ssa.Function) *builder {
@@ -413,16 +416,14 @@ func (c *compilerContext) makeLLVMType(goType types.Type) llvm.Type {
 		case types.Uintptr:
 			return c.uintptrType
 		case types.UnsafePointer:
-			return c.i8ptrType
+			return c.dataPtrType
 		default:
 			panic("unknown basic type: " + typ.String())
 		}
-	case *types.Chan:
-		return llvm.PointerType(c.getLLVMRuntimeType("channel"), 0)
+	case *types.Chan, *types.Map, *types.Pointer:
+		return c.dataPtrType // all pointers are the same
 	case *types.Interface:
 		return c.getLLVMRuntimeType("_interface")
-	case *types.Map:
-		return llvm.PointerType(c.getLLVMRuntimeType("hashmap"), 0)
 	case *types.Named:
 		if st, ok := typ.Underlying().(*types.Struct); ok {
 			// Structs are a special case. While other named types are ignored
@@ -437,21 +438,11 @@ func (c *compilerContext) makeLLVMType(goType types.Type) llvm.Type {
 			return llvmType
 		}
 		return c.getLLVMType(typ.Underlying())
-	case *types.Pointer:
-		if c.hasTypedPointers {
-			ptrTo := c.getLLVMType(typ.Elem())
-			return llvm.PointerType(ptrTo, 0)
-		}
-		return c.i8ptrType // all pointers are the same
 	case *types.Signature: // function value
 		return c.getFuncType(typ)
 	case *types.Slice:
-		ptrType := c.i8ptrType
-		if c.hasTypedPointers {
-			ptrType = llvm.PointerType(c.getLLVMType(typ.Elem()), 0)
-		}
 		members := []llvm.Type{
-			ptrType,
+			c.dataPtrType,
 			c.uintptrType, // len
 			c.uintptrType, // cap
 		}
@@ -541,8 +532,8 @@ func (c *compilerContext) createDIType(typ types.Type) llvm.Metadata {
 				Elements: []llvm.Metadata{
 					c.dibuilder.CreateMemberType(llvm.Metadata{}, llvm.DIMemberType{
 						Name:         "ptr",
-						SizeInBits:   c.targetData.TypeAllocSize(c.i8ptrType) * 8,
-						AlignInBits:  uint32(c.targetData.ABITypeAlignment(c.i8ptrType)) * 8,
+						SizeInBits:   c.targetData.TypeAllocSize(c.dataPtrType) * 8,
+						AlignInBits:  uint32(c.targetData.ABITypeAlignment(c.dataPtrType)) * 8,
 						OffsetInBits: 0,
 						Type:         c.getDIType(types.NewPointer(types.Typ[types.Byte])),
 					}),
@@ -1349,6 +1340,15 @@ func (b *builder) createFunction() {
 		}
 	}

+	// The rundefers instruction needs to be created after all defer
+	// instructions have been created. Otherwise it won't handle all defer
+	// cases.
+	for i, bb := range b.runDefersBlock {
+		b.SetInsertPointAtEnd(bb)
+		b.createRunDefers()
+		b.CreateBr(b.afterDefersBlock[i])
+	}
+
 	if b.hasDeferFrame() {
 		// Create the landing pad block, where execution continues after a
 		// panic.
@@ -1503,7 +1503,14 @@ func (b *builder) createInstruction(instr ssa.Instruction) {
 			b.CreateRet(retVal)
 		}
 	case *ssa.RunDefers:
-		b.createRunDefers()
+		// Note where we're going to put the rundefers block
+		run := b.insertBasicBlock("rundefers.block")
+		b.CreateBr(run)
+		b.runDefersBlock = append(b.runDefersBlock, run)
+
+		after := b.insertBasicBlock("rundefers.after")
+		b.SetInsertPointAtEnd(after)
+		b.afterDefersBlock = append(b.afterDefersBlock, after)
 	case *ssa.Send:
 		b.createChanSend(instr)
 	case *ssa.Store:
@@ -1528,21 +1535,18 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 		src := argValues[0]
 		elems := argValues[1]
 		srcBuf := b.CreateExtractValue(src, 0, "append.srcBuf")
-		srcPtr := b.CreateBitCast(srcBuf, b.i8ptrType, "append.srcPtr")
 		srcLen := b.CreateExtractValue(src, 1, "append.srcLen")
 		srcCap := b.CreateExtractValue(src, 2, "append.srcCap")
 		elemsBuf := b.CreateExtractValue(elems, 0, "append.elemsBuf")
-		elemsPtr := b.CreateBitCast(elemsBuf, b.i8ptrType, "append.srcPtr")
 		elemsLen := b.CreateExtractValue(elems, 1, "append.elemsLen")
 		elemType := b.getLLVMType(argTypes[0].Underlying().(*types.Slice).Elem())
 		elemSize := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(elemType), false)
-		result := b.createRuntimeCall("sliceAppend", []llvm.Value{srcPtr, elemsPtr, srcLen, srcCap, elemsLen, elemSize}, "append.new")
+		result := b.createRuntimeCall("sliceAppend", []llvm.Value{srcBuf, elemsBuf, srcLen, srcCap, elemsLen, elemSize}, "append.new")
 		newPtr := b.CreateExtractValue(result, 0, "append.newPtr")
-		newBuf := b.CreateBitCast(newPtr, srcBuf.Type(), "append.newBuf")
 		newLen := b.CreateExtractValue(result, 1, "append.newLen")
 		newCap := b.CreateExtractValue(result, 2, "append.newCap")
 		newSlice := llvm.Undef(src.Type())
-		newSlice = b.CreateInsertValue(newSlice, newBuf, 0, "")
+		newSlice = b.CreateInsertValue(newSlice, newPtr, 0, "")
 		newSlice = b.CreateInsertValue(newSlice, newLen, 1, "")
 		newSlice = b.CreateInsertValue(newSlice, newCap, 2, "")
 		return newSlice, nil
@@ -1580,6 +1584,42 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 		cplx = b.CreateInsertValue(cplx, r, 0, "")
 		cplx = b.CreateInsertValue(cplx, i, 1, "")
 		return cplx, nil
+	case "clear":
+		value := argValues[0]
+		switch typ := argTypes[0].Underlying().(type) {
+		case *types.Slice:
+			elementType := b.getLLVMType(typ.Elem())
+			elementSize := b.targetData.TypeAllocSize(elementType)
+			elementAlign := b.targetData.ABITypeAlignment(elementType)
+
+			// The pointer to the data to be cleared.
+			llvmBuf := b.CreateExtractValue(value, 0, "buf")
+
+			// The length (in bytes) to be cleared.
+			llvmLen := b.CreateExtractValue(value, 1, "len")
+			llvmLen = b.CreateMul(llvmLen, llvm.ConstInt(llvmLen.Type(), elementSize, false), "")
+
+			// Do the clear operation using the LLVM memset builtin.
+			// This is also correct for nil slices: in those cases, len will be
+			// 0 which means the memset call is a no-op (according to the LLVM
+			// LangRef).
+			memset := b.getMemsetFunc()
+			call := b.createCall(memset.GlobalValueType(), memset, []llvm.Value{
+				llvmBuf, // dest
+				llvm.ConstInt(b.ctx.Int8Type(), 0, false), // val
+				llvmLen, // len
+				llvm.ConstInt(b.ctx.Int1Type(), 0, false), // isVolatile
+			}, "")
+			call.AddCallSiteAttribute(1, b.ctx.CreateEnumAttribute(llvm.AttributeKindID("align"), uint64(elementAlign)))
+
+			return llvm.Value{}, nil
+		case *types.Map:
+			m := argValues[0]
+			b.createMapClear(m)
+			return llvm.Value{}, nil
+		default:
+			return llvm.Value{}, b.makeError(pos, "unsupported type in clear builtin: "+typ.String())
+		}
 	case "copy":
 		dst := argValues[0]
 		src := argValues[1]
@@ -1588,8 +1628,6 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 		dstBuf := b.CreateExtractValue(dst, 0, "copy.dstArray")
 		srcBuf := b.CreateExtractValue(src, 0, "copy.srcArray")
 		elemType := b.getLLVMType(argTypes[0].Underlying().(*types.Slice).Elem())
-		dstBuf = b.CreateBitCast(dstBuf, b.i8ptrType, "copy.dstPtr")
-		srcBuf = b.CreateBitCast(srcBuf, b.i8ptrType, "copy.srcPtr")
 		elemSize := llvm.ConstInt(b.uintptrType, b.targetData.TypeAllocSize(elemType), false)
 		return b.createRuntimeCall("sliceCopy", []llvm.Value{dstBuf, srcBuf, dstLen, srcLen, elemSize}, "copy.n"), nil
 	case "delete":
@@ -1617,6 +1655,24 @@ func (b *builder) createBuiltin(argTypes []types.Type, argValues []llvm.Value, c
 			llvmLen = b.CreateZExt(llvmLen, b.intType, "len.int")
 		}
 		return llvmLen, nil
+	case "min", "max":
+		// min and max builtins, added in Go 1.21.
+		// We can simply reuse the existing binop comparison code, which has all
+		// the edge cases figured out already.
+		tok := token.LSS
+		if callName == "max" {
+			tok = token.GTR
+		}
+		result := argValues[0]
+		typ := argTypes[0]
+		for _, arg := range argValues[1:] {
+			cmp, err := b.createBinOp(tok, typ, typ, result, arg, pos)
+			if err != nil {
+				return result, err
+			}
+			result = b.CreateSelect(cmp, result, arg, "")
+		}
+		return result, nil
 	case "print", "println":
 		for i, value := range argValues {
 			if i >= 1 && callName == "println" {
@@ -1811,14 +1867,13 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
 		switch value := instr.Value.(type) {
 		case *ssa.Function:
 			// Regular function call. No context is necessary.
-			context = llvm.Undef(b.i8ptrType)
+			context = llvm.Undef(b.dataPtrType)
 			if info.variadic && len(fn.Params) == 0 {
 				// This matches Clang, see: https://godbolt.org/z/Gqv49xKMq
 				// Eventually we might be able to eliminate this special case
 				// entirely. For details, see:
 				// https://discourse.llvm.org/t/rfc-enabling-wstrict-prototypes-by-default-in-c/60521
 				calleeType = llvm.FunctionType(callee.GlobalValueType().ReturnType(), nil, false)
-				callee = llvm.ConstBitCast(callee, llvm.PointerType(calleeType, b.funcPtrAddrSpace))
 			}
 		case *ssa.MakeClosure:
 			// A call on a func value, but the callee is trivial to find. For
@@ -1846,13 +1901,14 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
 		params = append(params, typecode)
 		callee = b.getInvokeFunction(instr)
 		calleeType = callee.GlobalValueType()
-		context = llvm.Undef(b.i8ptrType)
+		context = llvm.Undef(b.dataPtrType)
 	} else {
 		// Function pointer.
 		value := b.getValue(instr.Value, getPos(instr))
 		// This is a func value, which cannot be called directly. We have to
 		// extract the function pointer and context first from the func value.
-		calleeType, callee, context = b.decodeFuncValue(value, instr.Value.Type().Underlying().(*types.Signature))
+		callee, context = b.decodeFuncValue(value)
+		calleeType = b.getLLVMFunctionType(instr.Value.Type().Underlying().(*types.Signature))
 		b.createNilCheck(instr.Value, callee, "fpcall")
 	}

@@ -1885,7 +1941,7 @@ func (b *builder) getValue(expr ssa.Value, pos token.Pos) llvm.Value {
 			return llvm.Undef(b.getLLVMType(expr.Type()))
 		}
 		_, fn := b.getFunction(expr)
-		return b.createFuncValue(fn, llvm.Undef(b.i8ptrType), expr.Signature)
+		return b.createFuncValue(fn, llvm.Undef(b.dataPtrType), expr.Signature)
 	case *ssa.Global:
 		value := b.getGlobal(expr)
 		if value.IsNil() {
@@ -1942,8 +1998,8 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 	case *ssa.Alloc:
 		typ := b.getLLVMType(expr.Type().Underlying().(*types.Pointer).Elem())
 		size := b.targetData.TypeAllocSize(typ)
-		// Move all "large" allocations to the heap.  This value is also transform.maxStackAlloc.
-		if expr.Heap || size > 256 {
+		// Move all "large" allocations to the heap.
+		if expr.Heap || size > b.MaxStackAlloc {
 			// Calculate ^uintptr(0)
 			maxSize := llvm.ConstNot(llvm.ConstInt(b.uintptrType, 0, false)).ZExtValue()
 			if size > maxSize {
@@ -1953,7 +2009,6 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 			sizeValue := llvm.ConstInt(b.uintptrType, size, false)
 			layoutValue := b.createObjectLayout(typ, expr.Pos())
 			buf := b.createRuntimeCall("alloc", []llvm.Value{sizeValue, layoutValue}, expr.Comment)
-			buf = b.CreateBitCast(buf, llvm.PointerType(typ, 0), "")
 			return buf, nil
 		} else {
 			buf := llvmutil.CreateEntryBlockAlloca(b.Builder, typ, expr.Comment)
@@ -1999,10 +2054,6 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 				value = b.CreateInsertValue(value, field, i, "changetype.struct")
 			}
 			return value, nil
-		case llvm.PointerTypeKind:
-			// This can happen with pointers to structs. This case is easy:
-			// simply bitcast the pointer to the destination type.
-			return b.CreateBitCast(x, llvmType, "changetype.pointer"), nil
 		default:
 			return llvm.Value{}, errors.New("todo: unknown ChangeType type: " + expr.X.Type().String())
 		}
@@ -2079,12 +2130,12 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 			// Can't load directly from array (as index is non-constant), so
 			// have to do it using an alloca+gep+load.
 			arrayType := collection.Type()
-			alloca, allocaPtr, allocaSize := b.createTemporaryAlloca(arrayType, "index.alloca")
+			alloca, allocaSize := b.createTemporaryAlloca(arrayType, "index.alloca")
 			b.CreateStore(collection, alloca)
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			ptr := b.CreateInBoundsGEP(arrayType, alloca, []llvm.Value{zero, index}, "index.gep")
 			result := b.CreateLoad(arrayType.ElementType(), ptr, "index.load")
-			b.emitLifetimeEnd(allocaPtr, allocaSize)
+			b.emitLifetimeEnd(alloca, allocaSize)
 			return result, nil
 		default:
 			panic("unknown *ssa.Index type")
@@ -2187,7 +2238,6 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		sliceSize := b.CreateBinOp(llvm.Mul, elemSizeValue, sliceCapCast, "makeslice.cap")
 		layoutValue := b.createObjectLayout(llvmElemType, expr.Pos())
 		slicePtr := b.createRuntimeCall("alloc", []llvm.Value{sliceSize, layoutValue}, "makeslice.buf")
-		slicePtr = b.CreateBitCast(slicePtr, llvm.PointerType(llvmElemType, 0), "makeslice.array")

 		// Extend or truncate if necessary. This is safe as we've already done
 		// the bounds check.
@@ -2233,7 +2283,7 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		default:
 			panic("unknown type in range: " + typ.String())
 		}
-		it, _, _ := b.createTemporaryAlloca(iteratorType, "range.it")
+		it, _ := b.createTemporaryAlloca(iteratorType, "range.it")
 		b.CreateStore(llvm.ConstNull(iteratorType), it)
 		return it, nil
 	case *ssa.Select:
@@ -2401,7 +2451,6 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
 		arrayLen := expr.Type().Underlying().(*types.Pointer).Elem().Underlying().(*types.Array).Len()
 		b.createSliceToArrayPointerCheck(sliceLen, arrayLen)
 		ptr := b.CreateExtractValue(slice, 0, "")
-		ptr = b.CreateBitCast(ptr, b.getLLVMType(expr.Type()), "")
 		return ptr, nil
 	case *ssa.TypeAssert:
 		return b.createTypeAssert(expr), nil
@@ -2867,16 +2916,16 @@ func (c *compilerContext) createConst(expr *ssa.Const, pos token.Pos) llvm.Value
 				zero := llvm.ConstInt(c.ctx.Int32Type(), 0, false)
 				strPtr = llvm.ConstInBoundsGEP(globalType, global, []llvm.Value{zero, zero})
 			} else {
-				strPtr = llvm.ConstNull(c.i8ptrType)
+				strPtr = llvm.ConstNull(c.dataPtrType)
 			}
 			strObj := llvm.ConstNamedStruct(c.getLLVMRuntimeType("_string"), []llvm.Value{strPtr, strLen})
 			return strObj
 		} else if typ.Kind() == types.UnsafePointer {
 			if !expr.IsNil() {
 				value, _ := constant.Uint64Val(constant.ToInt(expr.Value))
-				return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, value, false), c.i8ptrType)
+				return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, value, false), c.dataPtrType)
 			}
-			return llvm.ConstNull(c.i8ptrType)
+			return llvm.ConstNull(c.dataPtrType)
 		} else if typ.Info()&types.IsUnsigned != 0 {
 			n, _ := constant.Uint64Val(constant.ToInt(expr.Value))
 			return llvm.ConstInt(llvmType, n, false)
@@ -2920,7 +2969,7 @@ func (c *compilerContext) createConst(expr *ssa.Const, pos token.Pos) llvm.Value
 		// Create a generic nil interface with no dynamic type (typecode=0).
 		fields := []llvm.Value{
 			llvm.ConstInt(c.uintptrType, 0, false),
-			llvm.ConstPointerNull(c.i8ptrType),
+			llvm.ConstPointerNull(c.dataPtrType),
 		}
 		return llvm.ConstNamedStruct(c.getLLVMRuntimeType("_interface"), fields)
 	case *types.Pointer:
@@ -2928,12 +2977,16 @@ func (c *compilerContext) createConst(expr *ssa.Const, pos token.Pos) llvm.Value
 			panic("expected nil pointer constant")
 		}
 		return llvm.ConstPointerNull(c.getLLVMType(typ))
+	case *types.Array:
+		if expr.Value != nil {
+			panic("expected nil array constant")
+		}
+		return llvm.ConstNull(c.getLLVMType(expr.Type()))
 	case *types.Slice:
 		if expr.Value != nil {
 			panic("expected nil slice constant")
 		}
-		elemType := c.getLLVMType(typ.Elem())
-		llvmPtr := llvm.ConstPointerNull(llvm.PointerType(elemType, 0))
+		llvmPtr := llvm.ConstPointerNull(c.dataPtrType)
 		llvmLen := llvm.ConstInt(c.uintptrType, 0, false)
 		slice := c.ctx.ConstStruct([]llvm.Value{
 			llvmPtr, // backing array
@@ -2941,6 +2994,11 @@ func (c *compilerContext) createConst(expr *ssa.Const, pos token.Pos) llvm.Value
 			llvmLen, // cap
 		}, false)
 		return slice
+	case *types.Struct:
+		if expr.Value != nil {
+			panic("expected nil struct constant")
+		}
+		return llvm.ConstNull(c.getLLVMType(expr.Type()))
 	case *types.Map:
 		if !expr.IsNil() {
 			// I believe this is not allowed by the Go spec.
@@ -2969,7 +3027,7 @@ func (b *builder) createConvert(typeFrom, typeTo types.Type, value llvm.Value, p

 	// Conversion between pointers and unsafe.Pointer.
 	if isPtrFrom && isPtrTo {
-		return b.CreateBitCast(value, llvmTypeTo, ""), nil
+		return value, nil
 	}

 	switch typeTo := typeTo.Underlying().(type) {
@@ -3204,11 +3262,15 @@ func (b *builder) createUnOp(unop *ssa.UnOp) (llvm.Value, error) {
 			// Instead of a load from the global, create a bitcast of the
 			// function pointer itself.
 			name := strings.TrimSuffix(unop.X.(*ssa.Global).Name(), "$funcaddr")
-			_, fn := b.getFunction(b.fn.Pkg.Members[name].(*ssa.Function))
+			pkg := b.fn.Pkg
+			if pkg == nil {
+				pkg = b.fn.Origin().Pkg
+			}
+			_, fn := b.getFunction(pkg.Members[name].(*ssa.Function))
 			if fn.IsNil() {
 				return llvm.Value{}, b.makeError(unop.Pos(), "cgo function not found: "+name)
 			}
-			return b.CreateBitCast(fn, b.i8ptrType, ""), nil
+			return fn, nil
 		} else {
 			b.createNilCheck(unop.X, x, "deref")
 			load := b.CreateLoad(valueType, x, "")
@@ -29,7 +29,7 @@ func TestCompiler(t *testing.T) {
 	t.Parallel()

 	// Determine Go minor version (e.g. 16 in go1.16.3).
-	_, goMinor, err := goenv.GetGorootVersion(goenv.Get("GOROOT"))
+	_, goMinor, err := goenv.GetGorootVersion()
 	if err != nil {
 		t.Fatal("could not read Go version:", err)
 	}
@@ -54,6 +54,9 @@ func TestCompiler(t *testing.T) {
 	if goMinor >= 20 {
 		tests = append(tests, testCase{"go1.20.go", "", ""})
 	}
+	if goMinor >= 21 {
+		tests = append(tests, testCase{"go1.21.go", "", ""})
+	}

 	for _, tc := range tests {
 		name := tc.file
@@ -70,52 +73,11 @@ 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()

-			// 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)
+			mod, errs := testCompilePackage(t, options, tc.file)
 			if errs != nil {
 				for _, err := range errs {
 					t.Error(err)
@@ -123,20 +85,18 @@ 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.
-			funcPasses := llvm.NewFunctionPassManagerForModule(mod)
-			defer funcPasses.Dispose()
-			funcPasses.AddInstructionCombiningPass()
-			funcPasses.InitializeFunc()
-			for fn := mod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
-				funcPasses.RunFunc(fn)
+			passOptions := llvm.NewPassBuilderOptions()
+			defer passOptions.Dispose()
+			err = mod.RunPasses("instcombine", llvm.TargetMachine{}, passOptions)
+			if err != nil {
+				t.Error(err)
 			}
-			funcPasses.FinalizeFunc()

 			outFilePrefix := tc.file[:len(tc.file)-3]
 			if tc.target != "" {
@@ -207,12 +167,95 @@ func filterIrrelevantIRLines(lines []string) []string {
 		if strings.HasPrefix(line, "source_filename = ") {
 			continue
 		}
-		if llvmVersion < 14 && strings.HasPrefix(line, "target datalayout = ") {
+		if llvmVersion < 15 && strings.HasPrefix(line, "target datalayout = ") {
 			// The datalayout string may vary betewen LLVM versions.
-			// Right now test outputs are for LLVM 14 and higher.
+			// Right now test outputs are for LLVM 15 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.Split(errorsFileString, "\n") {
+		if strings.HasPrefix(line, "// ERROR: ") {
+			expectedErrors = append(expectedErrors, strings.TrimPrefix(line, "// ERROR: "))
+		}
+	}
+
+	// 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++
+	}
+}
+
+// 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)
+}
@@ -60,9 +60,8 @@ func (b *builder) deferInitFunc() {
 	b.deferBuiltinFuncs = make(map[ssa.Value]deferBuiltin)

 	// Create defer list pointer.
-	deferType := llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)
-	b.deferPtr = b.CreateAlloca(deferType, "deferPtr")
-	b.CreateStore(llvm.ConstPointerNull(deferType), b.deferPtr)
+	b.deferPtr = b.CreateAlloca(b.dataPtrType, "deferPtr")
+	b.CreateStore(llvm.ConstPointerNull(b.dataPtrType), b.deferPtr)

 	if b.hasDeferFrame() {
 		// Set up the defer frame with the current stack pointer.
@@ -249,8 +248,7 @@ func isInLoop(start *ssa.BasicBlock) bool {
 func (b *builder) createDefer(instr *ssa.Defer) {
 	// The pointer to the previous defer struct, which we will replace to
 	// make a linked list.
-	deferType := llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)
-	next := b.CreateLoad(deferType, b.deferPtr, "defer.next")
+	next := b.CreateLoad(b.dataPtrType, b.deferPtr, "defer.next")

 	var values []llvm.Value
 	valueTypes := []llvm.Type{b.uintptrType, next.Type()}
@@ -271,7 +269,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		typecode := b.CreateExtractValue(itf, 0, "invoke.func.typecode")
 		receiverValue := b.CreateExtractValue(itf, 1, "invoke.func.receiver")
 		values = []llvm.Value{callback, next, typecode, receiverValue}
-		valueTypes = append(valueTypes, b.i8ptrType, b.i8ptrType)
+		valueTypes = append(valueTypes, b.dataPtrType, b.dataPtrType)
 		for _, arg := range instr.Call.Args {
 			val := b.getValue(arg, getPos(instr))
 			values = append(values, val)
@@ -391,9 +389,8 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		// This may be hit a variable number of times, so use a heap allocation.
 		size := b.targetData.TypeAllocSize(deferredCallType)
 		sizeValue := llvm.ConstInt(b.uintptrType, size, false)
-		nilPtr := llvm.ConstNull(b.i8ptrType)
-		allocCall := b.createRuntimeCall("alloc", []llvm.Value{sizeValue, nilPtr}, "defer.alloc.call")
-		alloca = b.CreateBitCast(allocCall, llvm.PointerType(deferredCallType, 0), "defer.alloc")
+		nilPtr := llvm.ConstNull(b.dataPtrType)
+		alloca = b.createRuntimeCall("alloc", []llvm.Value{sizeValue, nilPtr}, "defer.alloc.call")
 	}
 	if b.NeedsStackObjects {
 		b.trackPointer(alloca)
@@ -401,14 +398,12 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 	b.CreateStore(deferredCall, alloca)

 	// Push it on top of the linked list by replacing deferPtr.
-	allocaCast := b.CreateBitCast(alloca, next.Type(), "defer.alloca.cast")
-	b.CreateStore(allocaCast, b.deferPtr)
+	b.CreateStore(alloca, b.deferPtr)
 }

 // createRunDefers emits code to run all deferred functions.
 func (b *builder) createRunDefers() {
 	deferType := b.getLLVMRuntimeType("_defer")
-	deferPtrType := llvm.PointerType(deferType, 0)

 	// Add a loop like the following:
 	//     for stack != nil {
@@ -435,7 +430,7 @@ func (b *builder) createRunDefers() {
 	// Create loop head:
 	//     for stack != nil {
 	b.SetInsertPointAtEnd(loophead)
-	deferData := b.CreateLoad(deferPtrType, b.deferPtr, "")
+	deferData := b.CreateLoad(b.dataPtrType, b.deferPtr, "")
 	stackIsNil := b.CreateICmp(llvm.IntEQ, deferData, llvm.ConstPointerNull(deferData.Type()), "stackIsNil")
 	b.CreateCondBr(stackIsNil, end, loop)

@@ -448,7 +443,7 @@ func (b *builder) createRunDefers() {
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 		llvm.ConstInt(b.ctx.Int32Type(), 1, false), // .next field
 	}, "stack.next.gep")
-	nextStack := b.CreateLoad(deferPtrType, nextStackGEP, "stack.next")
+	nextStack := b.CreateLoad(b.dataPtrType, nextStackGEP, "stack.next")
 	b.CreateStore(nextStack, b.deferPtr)
 	gep := b.CreateInBoundsGEP(deferType, deferData, []llvm.Value{
 		llvm.ConstInt(b.ctx.Int32Type(), 0, false),
@@ -469,28 +464,26 @@ func (b *builder) createRunDefers() {
 			// Call on an value or interface value.

 			// Get the real defer struct type and cast to it.
-			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
+			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}

 			if !callback.IsInvoke() {
 				//Expect funcValue to be passed through the deferred call.
 				valueTypes = append(valueTypes, b.getFuncType(callback.Signature()))
 			} else {
 				//Expect typecode
-				valueTypes = append(valueTypes, b.i8ptrType, b.i8ptrType)
+				valueTypes = append(valueTypes, b.dataPtrType, b.dataPtrType)
 			}

 			for _, arg := range callback.Args {
 				valueTypes = append(valueTypes, b.getLLVMType(arg.Type()))
 			}

-			deferredCallType := b.ctx.StructType(valueTypes, false)
-			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")
-
 			// Extract the params from the struct (including receiver).
 			forwardParams := []llvm.Value{}
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
+			deferredCallType := b.ctx.StructType(valueTypes, false)
 			for i := 2; i < len(valueTypes); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "gep")
+				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "gep")
 				forwardParam := b.CreateLoad(valueTypes[i], gep, "param")
 				forwardParams = append(forwardParams, forwardParam)
 			}
@@ -505,7 +498,8 @@ func (b *builder) createRunDefers() {

 				//Get function pointer and context
 				var context llvm.Value
-				fnType, fnPtr, context = b.decodeFuncValue(funcValue, callback.Signature())
+				fnPtr, context = b.decodeFuncValue(funcValue)
+				fnType = b.getLLVMFunctionType(callback.Signature())

 				//Pass context
 				forwardParams = append(forwardParams, context)
@@ -519,7 +513,7 @@ func (b *builder) createRunDefers() {
 				// Add the context parameter. An interface call cannot also be a
 				// closure but we have to supply the parameter anyway for platforms
 				// with a strict calling convention.
-				forwardParams = append(forwardParams, llvm.Undef(b.i8ptrType))
+				forwardParams = append(forwardParams, llvm.Undef(b.dataPtrType))
 			}

 			b.createCall(fnType, fnPtr, forwardParams, "")
@@ -528,18 +522,17 @@ func (b *builder) createRunDefers() {
 			// Direct call.

 			// Get the real defer struct type and cast to it.
-			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
+			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
 			for _, param := range getParams(callback.Signature) {
 				valueTypes = append(valueTypes, b.getLLVMType(param.Type()))
 			}
 			deferredCallType := b.ctx.StructType(valueTypes, false)
-			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")

 			// Extract the params from the struct.
 			forwardParams := []llvm.Value{}
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			for i := range getParams(callback.Signature) {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
+				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
 				forwardParam := b.CreateLoad(valueTypes[i+2], gep, "param")
 				forwardParams = append(forwardParams, forwardParam)
 			}
@@ -549,7 +542,7 @@ func (b *builder) createRunDefers() {
 			if !b.getFunctionInfo(callback).exported {
 				// Add the context parameter. We know it is ignored by the receiving
 				// function, but we have to pass one anyway.
-				forwardParams = append(forwardParams, llvm.Undef(b.i8ptrType))
+				forwardParams = append(forwardParams, llvm.Undef(b.dataPtrType))
 			}

 			// Call real function.
@@ -559,20 +552,19 @@ func (b *builder) createRunDefers() {
 		case *ssa.MakeClosure:
 			// Get the real defer struct type and cast to it.
 			fn := callback.Fn.(*ssa.Function)
-			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
+			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}
 			params := fn.Signature.Params()
 			for i := 0; i < params.Len(); i++ {
 				valueTypes = append(valueTypes, b.getLLVMType(params.At(i).Type()))
 			}
-			valueTypes = append(valueTypes, b.i8ptrType) // closure
+			valueTypes = append(valueTypes, b.dataPtrType) // closure
 			deferredCallType := b.ctx.StructType(valueTypes, false)
-			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")

 			// Extract the params from the struct.
 			forwardParams := []llvm.Value{}
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			for i := 2; i < len(valueTypes); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "")
+				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false)}, "")
 				forwardParam := b.CreateLoad(valueTypes[i], gep, "param")
 				forwardParams = append(forwardParams, forwardParam)
 			}
@@ -584,7 +576,7 @@ func (b *builder) createRunDefers() {
 			db := b.deferBuiltinFuncs[callback]

 			//Get parameter types
-			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
+			valueTypes := []llvm.Type{b.uintptrType, b.dataPtrType}

 			//Get signature from call results
 			params := callback.Type().Underlying().(*types.Signature).Params()
@@ -593,13 +585,12 @@ func (b *builder) createRunDefers() {
 			}

 			deferredCallType := b.ctx.StructType(valueTypes, false)
-			deferredCallPtr := b.CreateBitCast(deferData, llvm.PointerType(deferredCallType, 0), "defercall")

 			// Extract the params from the struct.
 			var argValues []llvm.Value
 			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
 			for i := 0; i < params.Len(); i++ {
-				gep := b.CreateInBoundsGEP(deferredCallType, deferredCallPtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
+				gep := b.CreateInBoundsGEP(deferredCallType, deferData, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
 				forwardParam := b.CreateLoad(valueTypes[i+2], gep, "param")
 				argValues = append(argValues, forwardParam)
 			}
@@ -13,35 +13,14 @@ import (
 // createFuncValue creates a function value from a raw function pointer with no
 // context.
 func (b *builder) createFuncValue(funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
-	return b.compilerContext.createFuncValue(b.Builder, funcPtr, context, sig)
-}
-
-// createFuncValue creates a function value from a raw function pointer with no
-// context.
-func (c *compilerContext) createFuncValue(builder llvm.Builder, funcPtr, context llvm.Value, sig *types.Signature) llvm.Value {
 	// Closure is: {context, function pointer}
-	funcValueScalar := llvm.ConstBitCast(funcPtr, c.rawVoidFuncType)
-	funcValueType := c.getFuncType(sig)
+	funcValueType := b.getFuncType(sig)
 	funcValue := llvm.Undef(funcValueType)
-	funcValue = builder.CreateInsertValue(funcValue, context, 0, "")
-	funcValue = builder.CreateInsertValue(funcValue, funcValueScalar, 1, "")
+	funcValue = b.CreateInsertValue(funcValue, context, 0, "")
+	funcValue = b.CreateInsertValue(funcValue, funcPtr, 1, "")
 	return funcValue
 }

-// getFuncSignatureID returns a new external global for a given signature. This
-// global reference is not real, it is only used during func lowering to assign
-// signature types to functions and will then be removed.
-func (c *compilerContext) getFuncSignatureID(sig *types.Signature) llvm.Value {
-	s, _ := getTypeCodeName(sig)
-	sigGlobalName := "reflect/types.funcid:" + s
-	sigGlobal := c.mod.NamedGlobal(sigGlobalName)
-	if sigGlobal.IsNil() {
-		sigGlobal = llvm.AddGlobal(c.mod, c.ctx.Int8Type(), sigGlobalName)
-		sigGlobal.SetGlobalConstant(true)
-	}
-	return sigGlobal
-}
-
 // extractFuncScalar returns some scalar that can be used in comparisons. It is
 // a cheap operation.
 func (b *builder) extractFuncScalar(funcValue llvm.Value) llvm.Value {
@@ -55,28 +34,20 @@ func (b *builder) extractFuncContext(funcValue llvm.Value) llvm.Value {
 }

 // decodeFuncValue extracts the context and the function pointer from this func
-// value. This may be an expensive operation.
-func (b *builder) decodeFuncValue(funcValue llvm.Value, sig *types.Signature) (funcType llvm.Type, funcPtr, context llvm.Value) {
+// value.
+func (b *builder) decodeFuncValue(funcValue llvm.Value) (funcPtr, context llvm.Value) {
 	context = b.CreateExtractValue(funcValue, 0, "")
 	funcPtr = b.CreateExtractValue(funcValue, 1, "")
-	if !funcPtr.IsAConstantExpr().IsNil() && funcPtr.Opcode() == llvm.BitCast {
-		funcPtr = funcPtr.Operand(0) // needed for LLVM 14 (no opaque pointers)
-	}
-	if sig != nil {
-		funcType = b.getRawFuncType(sig)
-		llvmSig := llvm.PointerType(funcType, b.funcPtrAddrSpace)
-		funcPtr = b.CreateBitCast(funcPtr, llvmSig, "")
-	}
 	return
 }

 // getFuncType returns the type of a func value given a signature.
 func (c *compilerContext) getFuncType(typ *types.Signature) llvm.Type {
-	return c.ctx.StructType([]llvm.Type{c.i8ptrType, c.rawVoidFuncType}, false)
+	return c.ctx.StructType([]llvm.Type{c.dataPtrType, c.funcPtrType}, false)
 }

-// getRawFuncType returns a LLVM function type for a given signature.
-func (c *compilerContext) getRawFuncType(typ *types.Signature) llvm.Type {
+// getLLVMFunctionType returns a LLVM function type for a given signature.
+func (c *compilerContext) getLLVMFunctionType(typ *types.Signature) llvm.Type {
 	// Get the return type.
 	var returnType llvm.Type
 	switch typ.Results().Len() {
@@ -104,7 +75,7 @@ func (c *compilerContext) getRawFuncType(typ *types.Signature) llvm.Type {
 		if recv.StructName() == "runtime._interface" {
 			// This is a call on an interface, not a concrete type.
 			// The receiver is not an interface, but a i8* type.
-			recv = c.i8ptrType
+			recv = c.dataPtrType
 		}
 		for _, info := range c.expandFormalParamType(recv, "", nil) {
 			paramTypes = append(paramTypes, info.llvmType)
@@ -117,7 +88,7 @@ func (c *compilerContext) getRawFuncType(typ *types.Signature) llvm.Type {
 		}
 	}
 	// All functions take these parameters at the end.
-	paramTypes = append(paramTypes, c.i8ptrType) // context
+	paramTypes = append(paramTypes, c.dataPtrType) // context

 	// Make a func type out of the signature.
 	return llvm.FunctionType(returnType, paramTypes, false)
@@ -81,9 +81,6 @@ func (b *builder) trackValue(value llvm.Value) {
 // trackPointer creates a call to runtime.trackPointer, bitcasting the poitner
 // first if needed. The input value must be of LLVM pointer type.
 func (b *builder) trackPointer(value llvm.Value) {
-	if value.Type() != b.i8ptrType {
-		value = b.CreateBitCast(value, b.i8ptrType, "")
-	}
 	b.createRuntimeCall("trackPointer", []llvm.Value{value, b.stackChainAlloca}, "")
 }

@@ -21,7 +21,7 @@ func (b *builder) createGo(instr *ssa.Go) {

 	var prefix string
 	var funcPtr llvm.Value
-	var funcPtrType llvm.Type
+	var funcType llvm.Type
 	hasContext := false
 	if callee := instr.Call.StaticCallee(); callee != nil {
 		// Static callee is known. This makes it easier to start a new
@@ -42,7 +42,7 @@ func (b *builder) createGo(instr *ssa.Go) {
 			params = append(params, context) // context parameter
 			hasContext = true
 		}
-		funcPtrType, funcPtr = b.getFunction(callee)
+		funcType, funcPtr = b.getFunction(callee)
 	} else if builtin, ok := instr.Call.Value.(*ssa.Builtin); ok {
 		// We cheat. None of the builtins do any long or blocking operation, so
 		// we might as well run these builtins right away without the program
@@ -80,7 +80,7 @@ func (b *builder) createGo(instr *ssa.Go) {
 		itfTypeCode := b.CreateExtractValue(itf, 0, "")
 		itfValue := b.CreateExtractValue(itf, 1, "")
 		funcPtr = b.getInvokeFunction(&instr.Call)
-		funcPtrType = funcPtr.GlobalValueType()
+		funcType = funcPtr.GlobalValueType()
 		params = append([]llvm.Value{itfValue}, params...) // start with receiver
 		params = append(params, itfTypeCode)               // end with typecode
 	} else {
@@ -90,7 +90,8 @@ func (b *builder) createGo(instr *ssa.Go) {
 		//   * The function context, for closures.
 		//   * The function pointer (for tasks).
 		var context llvm.Value
-		funcPtrType, funcPtr, context = b.decodeFuncValue(b.getValue(instr.Call.Value, getPos(instr)), instr.Call.Value.Type().Underlying().(*types.Signature))
+		funcPtr, context = b.decodeFuncValue(b.getValue(instr.Call.Value, getPos(instr)))
+		funcType = b.getLLVMFunctionType(instr.Call.Value.Type().Underlying().(*types.Signature))
 		params = append(params, context, funcPtr)
 		hasContext = true
 		prefix = b.fn.RelString(nil)
@@ -98,14 +99,14 @@ func (b *builder) createGo(instr *ssa.Go) {

 	paramBundle := b.emitPointerPack(params)
 	var stackSize llvm.Value
-	callee := b.createGoroutineStartWrapper(funcPtrType, funcPtr, prefix, hasContext, instr.Pos())
+	callee := b.createGoroutineStartWrapper(funcType, funcPtr, prefix, hasContext, instr.Pos())
 	if b.AutomaticStackSize {
 		// The stack size is not known until after linking. Call a dummy
 		// function that will be replaced with a load from a special ELF
 		// section that contains the stack size (and is modified after
 		// linking).
 		stackSizeFnType, stackSizeFn := b.getFunction(b.program.ImportedPackage("internal/task").Members["getGoroutineStackSize"].(*ssa.Function))
-		stackSize = b.createCall(stackSizeFnType, stackSizeFn, []llvm.Value{callee, llvm.Undef(b.i8ptrType)}, "stacksize")
+		stackSize = b.createCall(stackSizeFnType, stackSizeFn, []llvm.Value{callee, llvm.Undef(b.dataPtrType)}, "stacksize")
 	} else {
 		// The stack size is fixed at compile time. By emitting it here as a
 		// constant, it can be optimized.
@@ -115,7 +116,7 @@ func (b *builder) createGo(instr *ssa.Go) {
 		stackSize = llvm.ConstInt(b.uintptrType, b.DefaultStackSize, false)
 	}
 	fnType, start := b.getFunction(b.program.ImportedPackage("internal/task").Members["start"].(*ssa.Function))
-	b.createCall(fnType, start, []llvm.Value{callee, paramBundle, stackSize, llvm.Undef(b.i8ptrType)}, "")
+	b.createCall(fnType, start, []llvm.Value{callee, paramBundle, stackSize, llvm.Undef(b.dataPtrType)}, "")
 }

 // createGoroutineStartWrapper creates a wrapper for the task-based
@@ -165,7 +166,7 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 		}

 		// Create the wrapper.
-		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.i8ptrType}, false)
+		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.dataPtrType}, false)
 		wrapper = llvm.AddFunction(c.mod, name+"$gowrapper", wrapperType)
 		c.addStandardAttributes(wrapper)
 		wrapper.SetLinkage(llvm.LinkOnceODRLinkage)
@@ -203,7 +204,7 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 		}
 		params := b.emitPointerUnpack(wrapper.Param(0), paramTypes)
 		if !hasContext {
-			params = append(params, llvm.Undef(c.i8ptrType)) // add dummy context parameter
+			params = append(params, llvm.Undef(c.dataPtrType)) // add dummy context parameter
 		}

 		// Create the call.
@@ -211,7 +212,7 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.

 		if c.Scheduler == "asyncify" {
 			b.CreateCall(deadlockType, deadlock, []llvm.Value{
-				llvm.Undef(c.i8ptrType),
+				llvm.Undef(c.dataPtrType),
 			}, "")
 		}

@@ -234,7 +235,7 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.
 		// merged into one.

 		// Create the wrapper.
-		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.i8ptrType}, false)
+		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.dataPtrType}, false)
 		wrapper = llvm.AddFunction(c.mod, prefix+".gowrapper", wrapperType)
 		c.addStandardAttributes(wrapper)
 		wrapper.SetLinkage(llvm.LinkOnceODRLinkage)
@@ -279,7 +280,7 @@ func (c *compilerContext) createGoroutineStartWrapper(fnType llvm.Type, fn llvm.

 		if c.Scheduler == "asyncify" {
 			b.CreateCall(deadlockType, deadlock, []llvm.Value{
-				llvm.Undef(c.i8ptrType),
+				llvm.Undef(c.dataPtrType),
 			}, "")
 		}
 	}
@@ -99,8 +99,8 @@ func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error)
 			case llvm.IntegerTypeKind:
 				constraints = append(constraints, "r")
 			case llvm.PointerTypeKind:
-				// Memory references require a type in LLVM 14, probably as a
-				// preparation for opaque pointers.
+				// Memory references require a type starting with LLVM 14,
+				// probably as a preparation for opaque pointers.
 				err = b.makeError(instr.Pos(), "support for pointer operands was dropped in TinyGo 0.23")
 				return s
 			default:
@@ -6,6 +6,7 @@ package compiler
 // interface-lowering.go for more details.

 import (
+	"encoding/binary"
 	"fmt"
 	"go/token"
 	"go/types"
@@ -126,6 +127,31 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 	if _, ok := typ.Underlying().(*types.Interface); ok {
 		hasMethodSet = false
 	}
+
+	var numMethods int
+	if hasMethodSet {
+		for i := 0; i < ms.Len(); i++ {
+			if ms.At(i).Obj().Exported() {
+				numMethods++
+			}
+		}
+	}
+
+	// Short-circuit all the global pointer logic here for pointers to pointers.
+	if typ, ok := typ.(*types.Pointer); ok {
+		if _, ok := typ.Elem().(*types.Pointer); ok {
+			// For a pointer to a pointer, we just increase the pointer by 1
+			ptr := c.getTypeCode(typ.Elem())
+			// if the type is already *****T or higher, we can't make it.
+			if typstr := typ.String(); strings.HasPrefix(typstr, "*****") {
+				c.addError(token.NoPos, fmt.Sprintf("too many levels of pointers for typecode: %s", typstr))
+			}
+			return llvm.ConstGEP(c.ctx.Int8Type(), ptr, []llvm.Value{
+				llvm.ConstInt(c.ctx.Int32Type(), 1, false),
+			})
+		}
+	}
+
 	typeCodeName, isLocal := getTypeCodeName(typ)
 	globalName := "reflect/types.type:" + typeCodeName
 	var global llvm.Value
@@ -192,6 +218,7 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
 				types.NewVar(token.NoPos, nil, "elementType", types.Typ[types.UnsafePointer]),
 				types.NewVar(token.NoPos, nil, "length", types.Typ[types.Uintptr]),
+				types.NewVar(token.NoPos, nil, "sliceOf", types.Typ[types.UnsafePointer]),
 			)
 		case *types.Map:
 			typeFieldTypes = append(typeFieldTypes,
@@ -205,6 +232,7 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 				types.NewVar(token.NoPos, nil, "numMethods", types.Typ[types.Uint16]),
 				types.NewVar(token.NoPos, nil, "ptrTo", types.Typ[types.UnsafePointer]),
 				types.NewVar(token.NoPos, nil, "pkgpath", types.Typ[types.UnsafePointer]),
+				types.NewVar(token.NoPos, nil, "size", types.Typ[types.Uint32]),
 				types.NewVar(token.NoPos, nil, "numFields", types.Typ[types.Uint16]),
 				types.NewVar(token.NoPos, nil, "fields", types.NewArray(c.getRuntimeType("structField"), int64(typ.NumFields()))),
 			)
@@ -236,6 +264,16 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 			c.interfaceTypes.Set(typ, global)
 		}
 		metabyte := getTypeKind(typ)
+
+		// Precompute these so we don't have to calculate them at runtime.
+		if types.Comparable(typ) {
+			metabyte |= 1 << 6
+		}
+
+		if hashmapIsBinaryKey(typ) {
+			metabyte |= 1 << 7
+		}
+
 		switch typ := typ.(type) {
 		case *types.Basic:
 			typeFields = []llvm.Value{c.getTypeCode(types.NewPointer(typ))}
@@ -249,11 +287,11 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 			}
 			pkgPathPtr := c.pkgPathPtr(pkgpath)
 			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(ms.Len()), false), // numMethods
-				c.getTypeCode(types.NewPointer(typ)),                      // ptrTo
-				c.getTypeCode(typ.Underlying()),                           // underlying
-				pkgPathPtr,                                                // pkgpath pointer
-				c.ctx.ConstString(pkgname+"."+name+"\x00", false),         // name
+				llvm.ConstInt(c.ctx.Int16Type(), uint64(numMethods), false), // numMethods
+				c.getTypeCode(types.NewPointer(typ)),                        // ptrTo
+				c.getTypeCode(typ.Underlying()),                             // underlying
+				pkgPathPtr,                                                  // pkgpath pointer
+				c.ctx.ConstString(pkgname+"."+name+"\x00", false),           // name
 			}
 			metabyte |= 1 << 5 // "named" flag
 		case *types.Chan:
@@ -280,7 +318,7 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 			}
 		case *types.Pointer:
 			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(ms.Len()), false), // numMethods
+				llvm.ConstInt(c.ctx.Int16Type(), uint64(numMethods), false), // numMethods
 				c.getTypeCode(typ.Elem()),
 			}
 		case *types.Array:
@@ -289,6 +327,7 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 				c.getTypeCode(types.NewPointer(typ)),                   // ptrTo
 				c.getTypeCode(typ.Elem()),                              // elementType
 				llvm.ConstInt(c.uintptrType, uint64(typ.Len()), false), // length
+				c.getTypeCode(types.NewSlice(typ.Elem())),              // slicePtr
 			}
 		case *types.Map:
 			typeFields = []llvm.Value{
@@ -306,16 +345,21 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 			}
 			pkgPathPtr := c.pkgPathPtr(pkgpath)

+			llvmStructType := c.getLLVMType(typ)
+			size := c.targetData.TypeStoreSize(llvmStructType)
 			typeFields = []llvm.Value{
-				llvm.ConstInt(c.ctx.Int16Type(), uint64(ms.Len()), false), // numMethods
-				c.getTypeCode(types.NewPointer(typ)),                      // ptrTo
+				llvm.ConstInt(c.ctx.Int16Type(), uint64(numMethods), false), // numMethods
+				c.getTypeCode(types.NewPointer(typ)),                        // ptrTo
 				pkgPathPtr,
+				llvm.ConstInt(c.ctx.Int32Type(), uint64(size), false),            // size
 				llvm.ConstInt(c.ctx.Int16Type(), uint64(typ.NumFields()), false), // numFields
 			}
 			structFieldType := c.getLLVMRuntimeType("structField")
+
 			var fields []llvm.Value
 			for i := 0; i < typ.NumFields(); i++ {
 				field := typ.Field(i)
+				offset := c.targetData.ElementOffset(llvmStructType, i)
 				var flags uint8
 				if field.Anonymous() {
 					flags |= structFieldFlagAnonymous
@@ -329,7 +373,11 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 				if field.Embedded() {
 					flags |= structFieldFlagIsEmbedded
 				}
-				data := string(flags) + field.Name() + "\x00"
+
+				var offsBytes [binary.MaxVarintLen32]byte
+				offLen := binary.PutUvarint(offsBytes[:], offset)
+
+				data := string(flags) + string(offsBytes[:offLen]) + field.Name() + "\x00"
 				if typ.Tag(i) != "" {
 					if len(typ.Tag(i)) > 0xff {
 						c.addError(field.Pos(), fmt.Sprintf("struct tag is %d bytes which is too long, max is 255", len(typ.Tag(i))))
@@ -366,10 +414,13 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 		}, typeFields...)
 		if hasMethodSet {
 			typeFields = append([]llvm.Value{
-				llvm.ConstBitCast(c.getTypeMethodSet(typ), c.i8ptrType),
+				c.getTypeMethodSet(typ),
 			}, typeFields...)
 		}
-		alignment := c.targetData.TypeAllocSize(c.i8ptrType)
+		alignment := c.targetData.TypeAllocSize(c.dataPtrType)
+		if alignment < 4 {
+			alignment = 4
+		}
 		globalValue := c.ctx.ConstStruct(typeFields, false)
 		global.SetInitializer(globalValue)
 		if isLocal {
@@ -401,8 +452,8 @@ func (c *compilerContext) getTypeCode(typ types.Type) llvm.Value {
 		offset = 1
 	}
 	return llvm.ConstGEP(global.GlobalValueType(), global, []llvm.Value{
-		llvm.ConstInt(llvm.Int32Type(), 0, false),
-		llvm.ConstInt(llvm.Int32Type(), offset, false),
+		llvm.ConstInt(c.ctx.Int32Type(), 0, false),
+		llvm.ConstInt(c.ctx.Int32Type(), offset, false),
 	})
 }

@@ -577,7 +628,7 @@ func (c *compilerContext) getTypeMethodSet(typ types.Type) llvm.Value {
 		// Construct global value.
 		globalValue := c.ctx.ConstStruct([]llvm.Value{
 			llvm.ConstInt(c.uintptrType, uint64(ms.Len()), false),
-			llvm.ConstArray(c.i8ptrType, signatures),
+			llvm.ConstArray(c.dataPtrType, signatures),
 			c.ctx.ConstStruct(wrappers, false),
 		}, false)
 		global = llvm.AddGlobal(c.mod, globalValue.Type(), globalName)
@@ -633,25 +684,28 @@ func (b *builder) createTypeAssert(expr *ssa.TypeAssert) llvm.Value {

 	actualTypeNum := b.CreateExtractValue(itf, 0, "interface.type")
 	commaOk := llvm.Value{}
-	if _, ok := expr.AssertedType.Underlying().(*types.Interface); ok {
-		// Type assert on interface type.
-		// This is a call to an interface type assert function.
-		// The interface lowering pass will define this function by filling it
-		// with a type switch over all concrete types that implement this
-		// interface, and returning whether it's one of the matched types.
-		// This is very different from how interface asserts are implemented in
-		// the main Go compiler, where the runtime checks whether the type
-		// implements each method of the interface. See:
-		// https://research.swtch.com/interfaces
-		fn := b.getInterfaceImplementsFunc(expr.AssertedType)
-		commaOk = b.CreateCall(fn.GlobalValueType(), fn, []llvm.Value{actualTypeNum}, "")

-	} else {
-		assertedTypeGlobal := b.getTypeCode(expr.AssertedType)
-		if !assertedTypeGlobal.IsAConstantExpr().IsNil() {
-			assertedTypeGlobal = assertedTypeGlobal.Operand(0) // resolve the GEP operation
+	if intf, ok := expr.AssertedType.Underlying().(*types.Interface); ok {
+		if intf.Empty() {
+			// intf is the empty interface => no methods
+			// This type assertion always succeeds, so we can just set commaOk to true.
+			commaOk = llvm.ConstInt(b.ctx.Int1Type(), 1, true)
+		} else {
+			// Type assert on interface type with methods.
+			// This is a call to an interface type assert function.
+			// The interface lowering pass will define this function by filling it
+			// with a type switch over all concrete types that implement this
+			// interface, and returning whether it's one of the matched types.
+			// This is very different from how interface asserts are implemented in
+			// the main Go compiler, where the runtime checks whether the type
+			// implements each method of the interface. See:
+			// https://research.swtch.com/interfaces
+			fn := b.getInterfaceImplementsFunc(expr.AssertedType)
+			commaOk = b.CreateCall(fn.GlobalValueType(), fn, []llvm.Value{actualTypeNum}, "")
 		}
-		globalName := "reflect/types.typeid:" + strings.TrimPrefix(assertedTypeGlobal.Name(), "reflect/types.type:")
+	} else {
+		name, _ := getTypeCodeName(expr.AssertedType)
+		globalName := "reflect/types.typeid:" + name
 		assertedTypeCodeGlobal := b.mod.NamedGlobal(globalName)
 		if assertedTypeCodeGlobal.IsNil() {
 			// Create a new typecode global.
@@ -724,14 +778,14 @@ func (c *compilerContext) getMethodsString(itf *types.Interface) string {
 	return strings.Join(methods, "; ")
 }

-// getInterfaceImplementsfunc returns a declared function that works as a type
+// getInterfaceImplementsFunc returns a declared function that works as a type
 // switch. The interface lowering pass will define this function.
 func (c *compilerContext) getInterfaceImplementsFunc(assertedType types.Type) llvm.Value {
 	s, _ := getTypeCodeName(assertedType.Underlying())
 	fnName := s + ".$typeassert"
 	llvmFn := c.mod.NamedFunction(fnName)
 	if llvmFn.IsNil() {
-		llvmFnType := llvm.FunctionType(c.ctx.Int1Type(), []llvm.Type{c.i8ptrType}, false)
+		llvmFnType := llvm.FunctionType(c.ctx.Int1Type(), []llvm.Type{c.dataPtrType}, false)
 		llvmFn = llvm.AddFunction(c.mod, fnName, llvmFnType)
 		c.addStandardDeclaredAttributes(llvmFn)
 		methods := c.getMethodsString(assertedType.Underlying().(*types.Interface))
@@ -754,7 +808,7 @@ func (c *compilerContext) getInvokeFunction(instr *ssa.CallCommon) llvm.Value {
 			paramTuple = append(paramTuple, sig.Params().At(i))
 		}
 		paramTuple = append(paramTuple, types.NewVar(token.NoPos, nil, "$typecode", types.Typ[types.UnsafePointer]))
-		llvmFnType := c.getRawFuncType(types.NewSignature(sig.Recv(), types.NewTuple(paramTuple...), sig.Results(), false))
+		llvmFnType := c.getLLVMFunctionType(types.NewSignature(sig.Recv(), types.NewTuple(paramTuple...), sig.Results(), false))
 		llvmFn = llvm.AddFunction(c.mod, fnName, llvmFnType)
 		c.addStandardDeclaredAttributes(llvmFn)
 		llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("tinygo-invoke", c.getMethodSignatureName(instr.Method)))
@@ -794,7 +848,7 @@ func (c *compilerContext) getInterfaceInvokeWrapper(fn *ssa.Function, llvmFnType
 	}

 	// create wrapper function
-	paramTypes := append([]llvm.Type{c.i8ptrType}, llvmFnType.ParamTypes()[len(expandedReceiverType):]...)
+	paramTypes := append([]llvm.Type{c.dataPtrType}, llvmFnType.ParamTypes()[len(expandedReceiverType):]...)
 	wrapFnType := llvm.FunctionType(llvmFnType.ReturnType(), paramTypes, false)
 	wrapper = llvm.AddFunction(c.mod, wrapperName, wrapFnType)
 	c.addStandardAttributes(wrapper)
@@ -36,7 +36,7 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro
 		// Fall back to a generic error.
 		return llvm.Value{}, b.makeError(instr.Pos(), "interrupt function must be constant")
 	}
-	_, funcRawPtr, funcContext := b.decodeFuncValue(funcValue, nil)
+	funcRawPtr, funcContext := b.decodeFuncValue(funcValue)
 	funcPtr := llvm.ConstPtrToInt(funcRawPtr, b.uintptrType)

 	// Create a new global of type runtime/interrupt.handle. Globals of this
@@ -7,7 +7,6 @@ import (
 	"strconv"
 	"strings"

-	"github.com/tinygo-org/tinygo/compiler/llvmutil"
 	"tinygo.org/x/go-llvm"
 )

@@ -48,12 +47,9 @@ func (b *builder) defineIntrinsicFunction() {
 func (b *builder) createMemoryCopyImpl() {
 	b.createFunctionStart(true)
 	fnName := "llvm." + b.fn.Name() + ".p0.p0.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
-	if llvmutil.Major() < 15 { // compatibility with LLVM 14
-		fnName = "llvm." + b.fn.Name() + ".p0i8.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
-	}
 	llvmFn := b.mod.NamedFunction(fnName)
 	if llvmFn.IsNil() {
-		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.i8ptrType, b.uintptrType, b.ctx.Int1Type()}, false)
+		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType, b.dataPtrType, b.uintptrType, b.ctx.Int1Type()}, false)
 		llvmFn = llvm.AddFunction(b.mod, fnName, fnType)
 	}
 	var params []llvm.Value
@@ -70,15 +66,7 @@ func (b *builder) createMemoryCopyImpl() {
 // regular libc memset calls if they aren't optimized out in a different way.
 func (b *builder) createMemoryZeroImpl() {
 	b.createFunctionStart(true)
-	fnName := "llvm.memset.p0.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
-	if llvmutil.Major() < 15 { // compatibility with LLVM 14
-		fnName = "llvm.memset.p0i8.i" + strconv.Itoa(b.uintptrType.IntTypeWidth())
-	}
-	llvmFn := b.mod.NamedFunction(fnName)
-	if llvmFn.IsNil() {
-		fnType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType, b.ctx.Int8Type(), b.uintptrType, b.ctx.Int1Type()}, false)
-		llvmFn = llvm.AddFunction(b.mod, fnName, fnType)
-	}
+	llvmFn := b.getMemsetFunc()
 	params := []llvm.Value{
 		b.getValue(b.fn.Params[0], getPos(b.fn)),
 		llvm.ConstInt(b.ctx.Int8Type(), 0, false),
@@ -89,6 +77,17 @@ func (b *builder) createMemoryZeroImpl() {
 	b.CreateRetVoid()
 }

+// Return the llvm.memset.p0.i8 function declaration.
+func (c *compilerContext) getMemsetFunc() llvm.Value {
+	fnName := "llvm.memset.p0.i" + strconv.Itoa(c.uintptrType.IntTypeWidth())
+	llvmFn := c.mod.NamedFunction(fnName)
+	if llvmFn.IsNil() {
+		fnType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.dataPtrType, c.ctx.Int8Type(), c.uintptrType, c.ctx.Int1Type()}, false)
+		llvmFn = llvm.AddFunction(c.mod, fnName, fnType)
+	}
+	return llvmFn
+}
+
 // createKeepAlive creates the runtime.KeepAlive function. It is implemented
 // using inline assembly.
 func (b *builder) createKeepAliveImpl() {
@@ -105,7 +104,7 @@ func (b *builder) createKeepAliveImpl() {
 	//
 	// It should be portable to basically everything as the "r" register type
 	// exists basically everywhere.
-	asmType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.i8ptrType}, false)
+	asmType := llvm.FunctionType(b.ctx.VoidType(), []llvm.Type{b.dataPtrType}, false)
 	asmFn := llvm.InlineAsm(asmType, "", "r", true, false, 0, false)
 	b.createCall(asmType, asmFn, []llvm.Value{pointerValue}, "")

@@ -20,7 +20,7 @@ import (
 //
 // This is useful for creating temporary allocas for intrinsics. Don't forget to
 // end the lifetime using emitLifetimeEnd after you're done with it.
-func (b *builder) createTemporaryAlloca(t llvm.Type, name string) (alloca, bitcast, size llvm.Value) {
+func (b *builder) createTemporaryAlloca(t llvm.Type, name string) (alloca, size llvm.Value) {
 	return llvmutil.CreateTemporaryAlloca(b.Builder, b.mod, t, name)
 }

@@ -63,47 +63,45 @@ func (b *builder) emitPointerPack(values []llvm.Value) llvm.Value {
 	// Allocate memory for the packed data.
 	size := b.targetData.TypeAllocSize(packedType)
 	if size == 0 {
-		return llvm.ConstPointerNull(b.i8ptrType)
+		return llvm.ConstPointerNull(b.dataPtrType)
 	} else if len(values) == 1 && values[0].Type().TypeKind() == llvm.PointerTypeKind {
-		return b.CreateBitCast(values[0], b.i8ptrType, "pack.ptr")
-	} else if size <= b.targetData.TypeAllocSize(b.i8ptrType) {
+		return values[0]
+	} else if size <= b.targetData.TypeAllocSize(b.dataPtrType) {
 		// Packed data fits in a pointer, so store it directly inside the
 		// pointer.
 		if len(values) == 1 && values[0].Type().TypeKind() == llvm.IntegerTypeKind {
 			// Try to keep this cast in SSA form.
-			return b.CreateIntToPtr(values[0], b.i8ptrType, "pack.int")
+			return b.CreateIntToPtr(values[0], b.dataPtrType, "pack.int")
 		}

 		// Because packedType is a struct and we have to cast it to a *i8, store
 		// it in a *i8 alloca first and load the *i8 value from there. This is
 		// effectively a bitcast.
-		packedAlloc, _, _ := b.createTemporaryAlloca(b.i8ptrType, "")
+		packedAlloc, _ := b.createTemporaryAlloca(b.dataPtrType, "")

-		if size < b.targetData.TypeAllocSize(b.i8ptrType) {
+		if size < b.targetData.TypeAllocSize(b.dataPtrType) {
 			// The alloca is bigger than the value that will be stored in it.
 			// To avoid having some bits undefined, zero the alloca first.
 			// Hopefully this will get optimized away.
-			b.CreateStore(llvm.ConstNull(b.i8ptrType), packedAlloc)
+			b.CreateStore(llvm.ConstNull(b.dataPtrType), packedAlloc)
 		}

 		// Store all values in the alloca.
-		packedAllocCast := b.CreateBitCast(packedAlloc, llvm.PointerType(packedType, 0), "")
 		for i, value := range values {
 			indices := []llvm.Value{
 				llvm.ConstInt(b.ctx.Int32Type(), 0, false),
 				llvm.ConstInt(b.ctx.Int32Type(), uint64(i), false),
 			}
-			gep := b.CreateInBoundsGEP(packedType, packedAllocCast, indices, "")
+			gep := b.CreateInBoundsGEP(packedType, packedAlloc, indices, "")
 			b.CreateStore(value, gep)
 		}

 		// Load value (the *i8) from the alloca.
-		result := b.CreateLoad(b.i8ptrType, packedAlloc, "")
+		result := b.CreateLoad(b.dataPtrType, packedAlloc, "")

 		// End the lifetime of the alloca, to help the optimizer.
-		packedPtr := b.CreateBitCast(packedAlloc, b.i8ptrType, "")
 		packedSize := llvm.ConstInt(b.ctx.Int64Type(), b.targetData.TypeAllocSize(packedAlloc.Type()), false)
-		b.emitLifetimeEnd(packedPtr, packedSize)
+		b.emitLifetimeEnd(packedAlloc, packedSize)

 		return result
 	} else {
@@ -124,21 +122,20 @@ func (b *builder) emitPointerPack(values []llvm.Value) llvm.Value {
 			global.SetGlobalConstant(true)
 			global.SetUnnamedAddr(true)
 			global.SetLinkage(llvm.InternalLinkage)
-			return llvm.ConstBitCast(global, b.i8ptrType)
+			return global
 		}

 		// Packed data is bigger than a pointer, so allocate it on the heap.
 		sizeValue := llvm.ConstInt(b.uintptrType, size, false)
 		alloc := b.mod.NamedFunction("runtime.alloc")
-		packedHeapAlloc := b.CreateCall(alloc.GlobalValueType(), alloc, []llvm.Value{
+		packedAlloc := b.CreateCall(alloc.GlobalValueType(), alloc, []llvm.Value{
 			sizeValue,
-			llvm.ConstNull(b.i8ptrType),
-			llvm.Undef(b.i8ptrType), // unused context parameter
+			llvm.ConstNull(b.dataPtrType),
+			llvm.Undef(b.dataPtrType), // unused context parameter
 		}, "")
 		if b.NeedsStackObjects {
-			b.trackPointer(packedHeapAlloc)
+			b.trackPointer(packedAlloc)
 		}
-		packedAlloc := b.CreateBitCast(packedHeapAlloc, llvm.PointerType(packedType, 0), "")

 		// Store all values in the heap pointer.
 		for i, value := range values {
@@ -151,7 +148,7 @@ func (b *builder) emitPointerPack(values []llvm.Value) llvm.Value {
 		}

 		// Return the original heap allocation pointer, which already is an *i8.
-		return packedHeapAlloc
+		return packedAlloc
 	}
 }

@@ -160,28 +157,27 @@ func (b *builder) emitPointerUnpack(ptr llvm.Value, valueTypes []llvm.Type) []ll
 	packedType := b.ctx.StructType(valueTypes, false)

 	// Get a correctly-typed pointer to the packed data.
-	var packedAlloc, packedRawAlloc llvm.Value
+	var packedAlloc llvm.Value
+	needsLifetimeEnd := false
 	size := b.targetData.TypeAllocSize(packedType)
 	if size == 0 {
 		// No data to unpack.
 	} else if len(valueTypes) == 1 && valueTypes[0].TypeKind() == llvm.PointerTypeKind {
 		// A single pointer is always stored directly.
-		return []llvm.Value{b.CreateBitCast(ptr, valueTypes[0], "unpack.ptr")}
-	} else if size <= b.targetData.TypeAllocSize(b.i8ptrType) {
+		return []llvm.Value{ptr}
+	} else if size <= b.targetData.TypeAllocSize(b.dataPtrType) {
 		// Packed data stored directly in pointer.
 		if len(valueTypes) == 1 && valueTypes[0].TypeKind() == llvm.IntegerTypeKind {
 			// Keep this cast in SSA form.
 			return []llvm.Value{b.CreatePtrToInt(ptr, valueTypes[0], "unpack.int")}
 		}
 		// Fallback: load it using an alloca.
-		packedRawAlloc, _, _ = b.createTemporaryAlloca(llvm.PointerType(b.i8ptrType, 0), "unpack.raw.alloc")
-		packedRawValue := b.CreateBitCast(ptr, llvm.PointerType(b.i8ptrType, 0), "unpack.raw.value")
-		b.CreateStore(packedRawValue, packedRawAlloc)
-		packedAlloc = b.CreateBitCast(packedRawAlloc, llvm.PointerType(packedType, 0), "unpack.alloc")
+		packedAlloc, _ = b.createTemporaryAlloca(b.dataPtrType, "unpack.raw.alloc")
+		b.CreateStore(ptr, packedAlloc)
+		needsLifetimeEnd = true
 	} else {
-		// Packed data stored on the heap. Bitcast the passed-in pointer to the
-		// correct pointer type.
-		packedAlloc = b.CreateBitCast(ptr, llvm.PointerType(packedType, 0), "unpack.raw.ptr")
+		// Packed data stored on the heap.
+		packedAlloc = ptr
 	}
 	// Load each value from the packed data.
 	values := make([]llvm.Value, len(valueTypes))
@@ -198,10 +194,9 @@ func (b *builder) emitPointerUnpack(ptr llvm.Value, valueTypes []llvm.Type) []ll
 		gep := b.CreateInBoundsGEP(packedType, packedAlloc, indices, "")
 		values[i] = b.CreateLoad(valueType, gep, "")
 	}
-	if !packedRawAlloc.IsNil() {
-		allocPtr := b.CreateBitCast(packedRawAlloc, b.i8ptrType, "")
+	if needsLifetimeEnd {
 		allocSize := llvm.ConstInt(b.ctx.Int64Type(), b.targetData.TypeAllocSize(b.uintptrType), false)
-		b.emitLifetimeEnd(allocPtr, allocSize)
+		b.emitLifetimeEnd(packedAlloc, allocSize)
 	}
 	return values
 }
@@ -253,12 +248,12 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	// Do a few checks to see whether we need to generate any object layout
 	// information at all.
 	objectSizeBytes := c.targetData.TypeAllocSize(t)
-	pointerSize := c.targetData.TypeAllocSize(c.i8ptrType)
-	pointerAlignment := c.targetData.PrefTypeAlignment(c.i8ptrType)
+	pointerSize := c.targetData.TypeAllocSize(c.dataPtrType)
+	pointerAlignment := c.targetData.PrefTypeAlignment(c.dataPtrType)
 	if objectSizeBytes < pointerSize {
 		// Too small to contain a pointer.
 		layout := (uint64(1) << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.i8ptrType)
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
 	}
 	bitmap := c.getPointerBitmap(t, pos)
 	if bitmap.BitLen() == 0 {
@@ -266,13 +261,13 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		// TODO: this can be done in many other cases, e.g. when allocating an
 		// array (like [4][]byte, which repeats a slice 4 times).
 		layout := (uint64(1) << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.i8ptrType)
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
 	}
 	if objectSizeBytes%uint64(pointerAlignment) != 0 {
 		// This shouldn't happen except for packed structs, which aren't
 		// currently used.
 		c.addError(pos, "internal error: unexpected object size for object with pointer field")
-		return llvm.ConstNull(c.i8ptrType)
+		return llvm.ConstNull(c.dataPtrType)
 	}
 	objectSizeWords := objectSizeBytes / uint64(pointerAlignment)

@@ -297,7 +292,7 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		// The runtime knows that if the least significant bit of the pointer is
 		// set, the pointer contains the value itself.
 		layout := bitmap.Uint64()<<(sizeFieldBits+1) | (objectSizeWords << 1) | 1
-		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.i8ptrType)
+		return llvm.ConstIntToPtr(llvm.ConstInt(c.uintptrType, layout, false), c.dataPtrType)
 	}

 	// Unfortunately, the object layout is too big to fit in a pointer-sized
@@ -308,7 +303,7 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 	globalName := "runtime/gc.layout:" + fmt.Sprintf("%d-%0*x", objectSizeWords, (objectSizeWords+15)/16, bitmap)
 	global := c.mod.NamedGlobal(globalName)
 	if !global.IsNil() {
-		return llvm.ConstBitCast(global, c.i8ptrType)
+		return global
 	}

 	// Create the global initializer.
@@ -359,13 +354,13 @@ func (c *compilerContext) createObjectLayout(t llvm.Type, pos token.Pos) llvm.Va
 		global.AddMetadata(0, diglobal)
 	}

-	return llvm.ConstBitCast(global, c.i8ptrType)
+	return global
 }

 // getPointerBitmap scans the given LLVM type for pointers and sets bits in a
 // bigint at the word offset that contains a pointer. This scan is recursive.
 func (c *compilerContext) getPointerBitmap(typ llvm.Type, pos token.Pos) *big.Int {
-	alignment := c.targetData.PrefTypeAlignment(c.i8ptrType)
+	alignment := c.targetData.PrefTypeAlignment(c.dataPtrType)
 	switch typ.TypeKind() {
 	case llvm.IntegerTypeKind, llvm.FloatTypeKind, llvm.DoubleTypeKind:
 		return big.NewInt(0)
@@ -378,7 +373,7 @@ func (c *compilerContext) getPointerBitmap(typ llvm.Type, pos token.Pos) *big.In
 			// of type uintptr, but before the LowerFuncValues pass it actually
 			// contains a pointer (ptrtoint) to a global. This trips up the
 			// interp package. Therefore, make the id field a pointer for now.
-			typ = c.ctx.StructType([]llvm.Type{c.i8ptrType, c.i8ptrType}, false)
+			typ = c.ctx.StructType([]llvm.Type{c.dataPtrType, c.dataPtrType}, false)
 		}
 		for i, subtyp := range typ.StructElementTypes() {
 			subptrs := c.getPointerBitmap(subtyp, pos)
@@ -458,7 +453,7 @@ func (c *compilerContext) isThumb() bool {
 func (b *builder) readStackPointer() llvm.Value {
 	stacksave := b.mod.NamedFunction("llvm.stacksave")
 	if stacksave.IsNil() {
-		fnType := llvm.FunctionType(b.i8ptrType, nil, false)
+		fnType := llvm.FunctionType(b.dataPtrType, nil, false)
 		stacksave = llvm.AddFunction(b.mod, "llvm.stacksave", fnType)
 	}
 	return b.CreateCall(stacksave.GlobalValueType(), stacksave, nil, "")
@@ -8,22 +8,9 @@
 package llvmutil

 import (
-	"strconv"
-	"strings"
-
 	"tinygo.org/x/go-llvm"
 )

-// Major returns the LLVM major version.
-func Major() int {
-	llvmMajor, err := strconv.Atoi(strings.SplitN(llvm.Version, ".", 2)[0])
-	if err != nil {
-		// sanity check, should be unreachable
-		panic("could not parse LLVM version: " + err.Error())
-	}
-	return llvmMajor
-}
-
 // CreateEntryBlockAlloca creates a new alloca in the entry block, even though
 // the IR builder is located elsewhere. It assumes that the insert point is
 // at the end of the current block.
@@ -46,16 +33,14 @@ func CreateEntryBlockAlloca(builder llvm.Builder, t llvm.Type, name string) llvm
 //
 // This is useful for creating temporary allocas for intrinsics. Don't forget to
 // end the lifetime using emitLifetimeEnd after you're done with it.
-func CreateTemporaryAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type, name string) (alloca, bitcast, size llvm.Value) {
+func CreateTemporaryAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type, name string) (alloca, size llvm.Value) {
 	ctx := t.Context()
 	targetData := llvm.NewTargetData(mod.DataLayout())
 	defer targetData.Dispose()
-	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
 	alloca = CreateEntryBlockAlloca(builder, t, name)
-	bitcast = builder.CreateBitCast(alloca, i8ptrType, name+".bitcast")
 	size = llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(t), false)
 	fnType, fn := getLifetimeStartFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, bitcast}, "")
+	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
 	return
 }

@@ -64,21 +49,19 @@ func CreateInstructionAlloca(builder llvm.Builder, mod llvm.Module, t llvm.Type,
 	ctx := mod.Context()
 	targetData := llvm.NewTargetData(mod.DataLayout())
 	defer targetData.Dispose()
-	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)

 	alloca := CreateEntryBlockAlloca(builder, t, name)
 	builder.SetInsertPointBefore(inst)
-	bitcast := builder.CreateBitCast(alloca, i8ptrType, name+".bitcast")
 	size := llvm.ConstInt(ctx.Int64Type(), targetData.TypeAllocSize(t), false)
 	fnType, fn := getLifetimeStartFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, bitcast}, "")
+	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
 	if next := llvm.NextInstruction(inst); !next.IsNil() {
 		builder.SetInsertPointBefore(next)
 	} else {
 		builder.SetInsertPointAtEnd(inst.InstructionParent())
 	}
 	fnType, fn = getLifetimeEndFunc(mod)
-	builder.CreateCall(fnType, fn, []llvm.Value{size, bitcast}, "")
+	builder.CreateCall(fnType, fn, []llvm.Value{size, alloca}, "")
 	return alloca
 }

@@ -94,13 +77,10 @@ func EmitLifetimeEnd(builder llvm.Builder, mod llvm.Module, ptr, size llvm.Value
 // first if it doesn't exist yet.
 func getLifetimeStartFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
 	fnName := "llvm.lifetime.start.p0"
-	if Major() < 15 { // compatibility with LLVM 14
-		fnName = "llvm.lifetime.start.p0i8"
-	}
 	fn := mod.NamedFunction(fnName)
 	ctx := mod.Context()
-	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
-	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), i8ptrType}, false)
+	ptrType := llvm.PointerType(ctx.Int8Type(), 0)
+	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
 	if fn.IsNil() {
 		fn = llvm.AddFunction(mod, fnName, fnType)
 	}
@@ -111,13 +91,10 @@ func getLifetimeStartFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
 // first if it doesn't exist yet.
 func getLifetimeEndFunc(mod llvm.Module) (llvm.Type, llvm.Value) {
 	fnName := "llvm.lifetime.end.p0"
-	if Major() < 15 {
-		fnName = "llvm.lifetime.end.p0i8"
-	}
 	fn := mod.NamedFunction(fnName)
 	ctx := mod.Context()
-	i8ptrType := llvm.PointerType(ctx.Int8Type(), 0)
-	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), i8ptrType}, false)
+	ptrType := llvm.PointerType(ctx.Int8Type(), 0)
+	fnType := llvm.FunctionType(ctx.VoidType(), []llvm.Type{ctx.Int64Type(), ptrType}, false)
 	if fn.IsNil() {
 		fn = llvm.AddFunction(mod, fnName, fnType)
 	}
@@ -213,13 +190,15 @@ func AppendToGlobal(mod llvm.Module, globalName string, values ...llvm.Value) {
 	}

 	// Add the new values.
-	i8ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
+	ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
 	for _, value := range values {
-		usedValues = append(usedValues, llvm.ConstPointerCast(value, i8ptrType))
+		// Note: the bitcast is necessary to cast AVR function pointers to
+		// address space 0 pointer types.
+		usedValues = append(usedValues, llvm.ConstPointerCast(value, ptrType))
 	}

 	// Create a new array (with the old and new values).
-	usedInitializer := llvm.ConstArray(i8ptrType, usedValues)
+	usedInitializer := llvm.ConstArray(ptrType, usedValues)
 	used := llvm.AddGlobal(mod, usedInitializer.Type(), globalName)
 	used.SetInitializer(usedInitializer)
 	used.SetLinkage(llvm.AppendingLinkage)
@@ -65,7 +65,7 @@ func (b *builder) createMapLookup(keyType, valueType types.Type, m, key llvm.Val
 	// Allocate the memory for the resulting type. Do not zero this memory: it
 	// will be zeroed by the hashmap get implementation if the key is not
 	// present in the map.
-	mapValueAlloca, mapValuePtr, mapValueAllocaSize := b.createTemporaryAlloca(llvmValueType, "hashmap.value")
+	mapValueAlloca, mapValueAllocaSize := b.createTemporaryAlloca(llvmValueType, "hashmap.value")

 	// We need the map size (with type uintptr) to pass to the hashmap*Get
 	// functions. This is necessary because those *Get functions are valid on
@@ -82,19 +82,19 @@ func (b *builder) createMapLookup(keyType, valueType types.Type, m, key llvm.Val
 	keyType = keyType.Underlying()
 	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
 		// key is a string
-		params := []llvm.Value{m, key, mapValuePtr, mapValueSize}
+		params := []llvm.Value{m, key, mapValueAlloca, mapValueSize}
 		commaOkValue = b.createRuntimeCall("hashmapStringGet", params, "")
 	} else if hashmapIsBinaryKey(keyType) {
 		// key can be compared with runtime.memequal
 		// Store the key in an alloca, in the entry block to avoid dynamic stack
 		// growth.
-		mapKeyAlloca, mapKeyPtr, mapKeySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
+		mapKeyAlloca, mapKeySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
 		b.CreateStore(key, mapKeyAlloca)
 		b.zeroUndefBytes(b.getLLVMType(keyType), mapKeyAlloca)
 		// Fetch the value from the hashmap.
-		params := []llvm.Value{m, mapKeyPtr, mapValuePtr, mapValueSize}
+		params := []llvm.Value{m, mapKeyAlloca, mapValueAlloca, mapValueSize}
 		commaOkValue = b.createRuntimeCall("hashmapBinaryGet", params, "")
-		b.emitLifetimeEnd(mapKeyPtr, mapKeySize)
+		b.emitLifetimeEnd(mapKeyAlloca, mapKeySize)
 	} else {
 		// Not trivially comparable using memcmp. Make it an interface instead.
 		itfKey := key
@@ -102,14 +102,14 @@ func (b *builder) createMapLookup(keyType, valueType types.Type, m, key llvm.Val
 			// Not already an interface, so convert it to an interface now.
 			itfKey = b.createMakeInterface(key, origKeyType, pos)
 		}
-		params := []llvm.Value{m, itfKey, mapValuePtr, mapValueSize}
+		params := []llvm.Value{m, itfKey, mapValueAlloca, mapValueSize}
 		commaOkValue = b.createRuntimeCall("hashmapInterfaceGet", params, "")
 	}

 	// Load the resulting value from the hashmap. The value is set to the zero
 	// value if the key doesn't exist in the hashmap.
 	mapValue := b.CreateLoad(llvmValueType, mapValueAlloca, "")
-	b.emitLifetimeEnd(mapValuePtr, mapValueAllocaSize)
+	b.emitLifetimeEnd(mapValueAlloca, mapValueAllocaSize)

 	if commaOk {
 		tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{llvmValueType, b.ctx.Int1Type()}, false))
@@ -124,22 +124,22 @@ func (b *builder) createMapLookup(keyType, valueType types.Type, m, key llvm.Val
 // createMapUpdate updates a map key to a given value, by creating an
 // appropriate runtime call.
 func (b *builder) createMapUpdate(keyType types.Type, m, key, value llvm.Value, pos token.Pos) {
-	valueAlloca, valuePtr, valueSize := b.createTemporaryAlloca(value.Type(), "hashmap.value")
+	valueAlloca, valueSize := b.createTemporaryAlloca(value.Type(), "hashmap.value")
 	b.CreateStore(value, valueAlloca)
 	origKeyType := keyType
 	keyType = keyType.Underlying()
 	if t, ok := keyType.(*types.Basic); ok && t.Info()&types.IsString != 0 {
 		// key is a string
-		params := []llvm.Value{m, key, valuePtr}
+		params := []llvm.Value{m, key, valueAlloca}
 		b.createRuntimeCall("hashmapStringSet", params, "")
 	} else if hashmapIsBinaryKey(keyType) {
 		// key can be compared with runtime.memequal
-		keyAlloca, keyPtr, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
+		keyAlloca, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
 		b.CreateStore(key, keyAlloca)
 		b.zeroUndefBytes(b.getLLVMType(keyType), keyAlloca)
-		params := []llvm.Value{m, keyPtr, valuePtr}
+		params := []llvm.Value{m, keyAlloca, valueAlloca}
 		b.createRuntimeCall("hashmapBinarySet", params, "")
-		b.emitLifetimeEnd(keyPtr, keySize)
+		b.emitLifetimeEnd(keyAlloca, keySize)
 	} else {
 		// Key is not trivially comparable, so compare it as an interface instead.
 		itfKey := key
@@ -147,10 +147,10 @@ func (b *builder) createMapUpdate(keyType types.Type, m, key, value llvm.Value,
 			// Not already an interface, so convert it to an interface first.
 			itfKey = b.createMakeInterface(key, origKeyType, pos)
 		}
-		params := []llvm.Value{m, itfKey, valuePtr}
+		params := []llvm.Value{m, itfKey, valueAlloca}
 		b.createRuntimeCall("hashmapInterfaceSet", params, "")
 	}
-	b.emitLifetimeEnd(valuePtr, valueSize)
+	b.emitLifetimeEnd(valueAlloca, valueSize)
 }

 // createMapDelete deletes a key from a map by calling the appropriate runtime
@@ -164,12 +164,12 @@ func (b *builder) createMapDelete(keyType types.Type, m, key llvm.Value, pos tok
 		b.createRuntimeCall("hashmapStringDelete", params, "")
 		return nil
 	} else if hashmapIsBinaryKey(keyType) {
-		keyAlloca, keyPtr, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
+		keyAlloca, keySize := b.createTemporaryAlloca(key.Type(), "hashmap.key")
 		b.CreateStore(key, keyAlloca)
 		b.zeroUndefBytes(b.getLLVMType(keyType), keyAlloca)
-		params := []llvm.Value{m, keyPtr}
+		params := []llvm.Value{m, keyAlloca}
 		b.createRuntimeCall("hashmapBinaryDelete", params, "")
-		b.emitLifetimeEnd(keyPtr, keySize)
+		b.emitLifetimeEnd(keyAlloca, keySize)
 		return nil
 	} else {
 		// Key is not trivially comparable, so compare it as an interface
@@ -185,6 +185,11 @@ func (b *builder) createMapDelete(keyType types.Type, m, key llvm.Value, pos tok
 	}
 }

+// Clear the given map.
+func (b *builder) createMapClear(m llvm.Value) {
+	b.createRuntimeCall("hashmapClear", []llvm.Value{m}, "")
+}
+
 // createMapIteratorNext lowers the *ssa.Next instruction for iterating over a
 // map. It returns a tuple of {bool, key, value} with the result of the
 // iteration.
@@ -220,9 +225,9 @@ func (b *builder) createMapIteratorNext(rangeVal ssa.Value, llvmRangeVal, it llv
 	}

 	// Extract the key and value from the map.
-	mapKeyAlloca, mapKeyPtr, mapKeySize := b.createTemporaryAlloca(llvmStoredKeyType, "range.key")
-	mapValueAlloca, mapValuePtr, mapValueSize := b.createTemporaryAlloca(llvmValueType, "range.value")
-	ok := b.createRuntimeCall("hashmapNext", []llvm.Value{llvmRangeVal, it, mapKeyPtr, mapValuePtr}, "range.next")
+	mapKeyAlloca, mapKeySize := b.createTemporaryAlloca(llvmStoredKeyType, "range.key")
+	mapValueAlloca, mapValueSize := b.createTemporaryAlloca(llvmValueType, "range.value")
+	ok := b.createRuntimeCall("hashmapNext", []llvm.Value{llvmRangeVal, it, mapKeyAlloca, mapValueAlloca}, "range.next")
 	mapKey := b.CreateLoad(llvmStoredKeyType, mapKeyAlloca, "")
 	mapValue := b.CreateLoad(llvmValueType, mapValueAlloca, "")

@@ -233,8 +238,8 @@ func (b *builder) createMapIteratorNext(rangeVal ssa.Value, llvmRangeVal, it llv
 	}

 	// End the lifetimes of the allocas, because we're done with them.
-	b.emitLifetimeEnd(mapKeyPtr, mapKeySize)
-	b.emitLifetimeEnd(mapValuePtr, mapValueSize)
+	b.emitLifetimeEnd(mapKeyAlloca, mapKeySize)
+	b.emitLifetimeEnd(mapValueAlloca, mapValueSize)

 	// Construct the *ssa.Next return value: {ok, mapKey, mapValue}
 	tuple := llvm.Undef(b.ctx.StructType([]llvm.Type{b.ctx.Int1Type(), llvmKeyType, llvmValueType}, false))
@@ -328,14 +333,7 @@ func (b *builder) zeroUndefBytes(llvmType llvm.Type, ptr llvm.Value) error {
 			if fieldEndOffset != nextOffset {
 				n := llvm.ConstInt(b.uintptrType, nextOffset-fieldEndOffset, false)
 				llvmStoreSize := llvm.ConstInt(b.uintptrType, storeSize, false)
-				gepPtr := elemPtr
-				if gepPtr.Type() != b.i8ptrType {
-					gepPtr = b.CreateBitCast(gepPtr, b.i8ptrType, "") // LLVM 14
-				}
-				paddingStart := b.CreateInBoundsGEP(b.ctx.Int8Type(), gepPtr, []llvm.Value{llvmStoreSize}, "")
-				if paddingStart.Type() != b.i8ptrType {
-					paddingStart = b.CreateBitCast(paddingStart, b.i8ptrType, "") // LLVM 14
-				}
+				paddingStart := b.CreateInBoundsGEP(b.ctx.Int8Type(), elemPtr, []llvm.Value{llvmStoreSize}, "")
 				b.createRuntimeCall("memzero", []llvm.Value{paddingStart, n}, "")
 			}
 		}
@@ -4,6 +4,7 @@ package compiler
 // pragmas, determines the link name, etc.

 import (
+	"fmt"
 	"go/ast"
 	"go/token"
 	"go/types"
@@ -22,9 +23,9 @@ import (
 // The linkName value contains a valid link name, even if //go:linkname is not
 // present.
 type functionInfo struct {
-	module     string     // go:wasm-module
-	importName string     // go:linkname, go:export - The name the developer assigns
-	linkName   string     // go:linkname, go:export - The name that we map for the particular module -> importName
+	wasmModule string     // go:wasm-module
+	wasmName   string     // wasm-export-name or wasm-import-name in the IR
+	linkName   string     // go:linkname, go:export - the IR function name
 	section    string     // go:section - object file section name
 	exported   bool       // go:export, CGo
 	interrupt  bool       // go:interrupt
@@ -95,7 +96,7 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 	// Add an extra parameter as the function context. This context is used in
 	// closures and bound methods, but should be optimized away when not used.
 	if !info.exported {
-		paramInfos = append(paramInfos, paramInfo{llvmType: c.i8ptrType, name: "context", elemSize: 0})
+		paramInfos = append(paramInfos, paramInfo{llvmType: c.dataPtrType, name: "context", elemSize: 0})
 	}

 	var paramTypes []llvm.Type
@@ -144,20 +145,18 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 		for _, attrName := range []string{"noalias", "nonnull"} {
 			llvmFn.AddAttributeAtIndex(0, c.ctx.CreateEnumAttribute(llvm.AttributeKindID(attrName), 0))
 		}
-		if llvmutil.Major() >= 15 { // allockind etc are not available in LLVM 14
-			// Add attributes to signal to LLVM that this is an allocator
-			// function. This enables a number of optimizations.
-			llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("allockind"), allocKindAlloc|allocKindZeroed))
-			llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("alloc-family", "runtime.alloc"))
-			// Use a special value to indicate the first parameter:
-			// > allocsize has two integer arguments, but because they're both 32 bits, we can
-			// > pack them into one 64-bit value, at the cost of making said value
-			// > nonsensical.
-			// >
-			// > In order to do this, we need to reserve one value of the second (optional)
-			// > allocsize argument to signify "not present."
-			llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("allocsize"), 0x0000_0000_ffff_ffff))
-		}
+		// Add attributes to signal to LLVM that this is an allocator function.
+		// This enables a number of optimizations.
+		llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("allockind"), allocKindAlloc|allocKindZeroed))
+		llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("alloc-family", "runtime.alloc"))
+		// Use a special value to indicate the first parameter:
+		// > allocsize has two integer arguments, but because they're both 32 bits, we can
+		// > pack them into one 64-bit value, at the cost of making said value
+		// > nonsensical.
+		// >
+		// > In order to do this, we need to reserve one value of the second (optional)
+		// > allocsize argument to signify "not present."
+		llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("allocsize"), 0x0000_0000_ffff_ffff))
 	case "runtime.sliceAppend":
 		// Appending a slice will only read the to-be-appended slice, it won't
 		// be modified.
@@ -179,7 +178,7 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 		if strings.Split(c.Triple, "-")[0] == "avr" {
 			// These functions are compiler-rt/libgcc functions that are
 			// currently implemented in Go. Assembly versions should appear in
-			// LLVM 16 hopefully. Until then, they need to be made available to
+			// LLVM 17 hopefully. Until then, they need to be made available to
 			// the linker and the best way to do that is llvm.compiler.used.
 			// I considered adding a pragma for this, but the LLVM language
 			// reference explicitly says that this feature should not be exposed
@@ -193,20 +192,14 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 	// External/exported functions may not retain pointer values.
 	// https://golang.org/cmd/cgo/#hdr-Passing_pointers
 	if info.exported {
-		if c.archFamily() == "wasm32" {
+		if c.archFamily() == "wasm32" && len(fn.Blocks) == 0 {
 			// We need to add the wasm-import-module and the wasm-import-name
 			// attributes.
-			module := info.module
-			if module == "" {
-				module = "env"
+			if info.wasmModule != "" {
+				llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("wasm-import-module", info.wasmModule))
 			}
-			llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("wasm-import-module", module))

-			name := info.importName
-			if name == "" {
-				name = info.linkName
-			}
-			llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("wasm-import-name", name))
+			llvmFn.AddFunctionAttr(c.ctx.CreateStringAttribute("wasm-import-name", info.wasmName))
 		}
 		nocaptureKind := llvm.AttributeKindID("nocapture")
 		nocapture := c.ctx.CreateEnumAttribute(nocaptureKind, 0)
@@ -239,26 +232,26 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 // present in *ssa.Function, such as the link name and whether it should be
 // exported.
 func (c *compilerContext) getFunctionInfo(f *ssa.Function) functionInfo {
+	if info, ok := c.functionInfos[f]; ok {
+		return info
+	}
 	info := functionInfo{
 		// Pick the default linkName.
 		linkName: f.RelString(nil),
 	}
 	// Check for //go: pragmas, which may change the link name (among others).
-	info.parsePragmas(f)
+	c.parsePragmas(&info, f)
+	c.functionInfos[f] = info
 	return info
 }

 // parsePragmas is used by getFunctionInfo to parse function pragmas such as
 // //export or //go:noinline.
-func (info *functionInfo) parsePragmas(f *ssa.Function) {
+func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 	if f.Syntax() == nil {
 		return
 	}
 	if decl, ok := f.Syntax().(*ast.FuncDecl); ok && decl.Doc != nil {
-
-		// Our importName for a wasm module (if we are compiling to wasm), or llvm link name
-		var importName string
-
 		for _, comment := range decl.Doc.List {
 			text := comment.Text
 			if strings.HasPrefix(text, "//export ") {
@@ -276,7 +269,8 @@ func (info *functionInfo) parsePragmas(f *ssa.Function) {
 					continue
 				}

-				importName = parts[1]
+				info.linkName = parts[1]
+				info.wasmName = info.linkName
 				info.exported = true
 			case "//go:interrupt":
 				if hasUnsafeImport(f.Pkg.Pkg) {
@@ -284,19 +278,22 @@ func (info *functionInfo) parsePragmas(f *ssa.Function) {
 				}
 			case "//go:wasm-module":
 				// Alternative comment for setting the import module.
+				// This is deprecated, use //go:wasmimport instead.
 				if len(parts) != 2 {
 					continue
 				}
-				info.module = parts[1]
+				info.wasmModule = parts[1]
 			case "//go:wasmimport":
 				// Import a WebAssembly function, for example a WASI function.
-				// For details, see: https://github.com/golang/go/issues/38248
-				if len(parts) != 3 || len(f.Blocks) != 0 {
+				// Original proposal: https://github.com/golang/go/issues/38248
+				// Allow globally: https://github.com/golang/go/issues/59149
+				if len(parts) != 3 {
 					continue
 				}
+				c.checkWasmImport(f, comment.Text)
 				info.exported = true
-				info.module = parts[1]
-				info.importName = parts[2]
+				info.wasmModule = parts[1]
+				info.wasmName = parts[2]
 			case "//go:inline":
 				info.inline = inlineHint
 			case "//go:noinline":
@@ -340,18 +337,59 @@ func (info *functionInfo) parsePragmas(f *ssa.Function) {
 				}
 			}
 		}
+	}
+}

-		// Set the importName for our exported function if we have one
-		if importName != "" {
-			if info.module == "" {
-				info.linkName = importName
-			} else {
-				// WebAssembly import
-				info.importName = importName
+// Check whether this function cannot be used in //go:wasmimport. It will add an
+// error if this is the case.
+//
+// The list of allowed types is based on this proposal:
+// https://github.com/golang/go/issues/59149
+func (c *compilerContext) checkWasmImport(f *ssa.Function, pragma string) {
+	if c.pkg.Path() == "runtime" || c.pkg.Path() == "syscall/js" {
+		// The runtime is a special case. Allow all kinds of parameters
+		// (importantly, including pointers).
+		return
+	}
+	if f.Blocks != nil {
+		// Defined functions cannot be exported.
+		c.addError(f.Pos(), fmt.Sprintf("can only use //go:wasmimport on declarations"))
+		return
+	}
+	if f.Signature.Results().Len() > 1 {
+		c.addError(f.Signature.Results().At(1).Pos(), fmt.Sprintf("%s: too many return values", pragma))
+	} else if f.Signature.Results().Len() == 1 {
+		result := f.Signature.Results().At(0)
+		if !isValidWasmType(result.Type(), true) {
+			c.addError(result.Pos(), fmt.Sprintf("%s: unsupported result type %s", pragma, result.Type().String()))
+		}
+	}
+	for _, param := range f.Params {
+		// Check whether the type is allowed.
+		// Only a very limited number of types can be mapped to WebAssembly.
+		if !isValidWasmType(param.Type(), false) {
+			c.addError(param.Pos(), fmt.Sprintf("%s: unsupported parameter type %s", pragma, param.Type().String()))
+		}
+	}
+}
+
+// Check whether the type maps directly to a WebAssembly type, according to:
+// https://github.com/golang/go/issues/59149
+func isValidWasmType(typ types.Type, isReturn bool) bool {
+	switch typ := typ.Underlying().(type) {
+	case *types.Basic:
+		switch typ.Kind() {
+		case types.Int32, types.Uint32, types.Int64, types.Uint64:
+			return true
+		case types.Float32, types.Float64:
+			return true
+		case types.UnsafePointer:
+			if !isReturn {
+				return true
 			}
 		}
-
 	}
+	return false
 }

 // getParams returns the function parameters, including the receiver at the
@@ -405,19 +443,14 @@ func (c *compilerContext) addStandardDefinedAttributes(llvmFn llvm.Value) {
 	llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("nounwind"), 0))
 	if strings.Split(c.Triple, "-")[0] == "x86_64" {
 		// Required by the ABI.
-		if llvmutil.Major() < 15 {
-			// Needed for LLVM 14 support.
-			llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("uwtable"), 0))
-		} else {
-			// The uwtable has two possible values: sync (1) or async (2). We
-			// use sync because we currently don't use async unwind tables.
-			// For details, see: https://llvm.org/docs/LangRef.html#function-attributes
-			llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("uwtable"), 1))
-		}
+		// The uwtable has two possible values: sync (1) or async (2). We use
+		// sync because we currently don't use async unwind tables.
+		// For details, see: https://llvm.org/docs/LangRef.html#function-attributes
+		llvmFn.AddFunctionAttr(c.ctx.CreateEnumAttribute(llvm.AttributeKindID("uwtable"), 1))
 	}
 }

-// addStandardAttribute adds all attributes added to defined functions.
+// addStandardAttributes adds all attributes added to defined functions.
 func (c *compilerContext) addStandardAttributes(llvmFn llvm.Value) {
 	c.addStandardDeclaredAttributes(llvmFn)
 	c.addStandardDefinedAttributes(llvmFn)
@@ -183,7 +183,7 @@ func (b *builder) createSyscall(call *ssa.CallCommon) (llvm.Value, error) {
 		}
 		llvmType := llvm.FunctionType(b.uintptrType, paramTypes, false)
 		fn := b.getValue(call.Args[0], getPos(call))
-		fnPtr := b.CreateIntToPtr(fn, llvm.PointerType(llvmType, 0), "")
+		fnPtr := b.CreateIntToPtr(fn, b.dataPtrType, "")

 		// Prepare some functions that will be called later.
 		setLastError := b.mod.NamedFunction("SetLastError")
@@ -196,10 +196,6 @@ entry:
 ; Function Attrs: nounwind
 define hidden void @main.foo(ptr %context) unnamed_addr #2 {
 entry:
-  %complit = alloca %main.kv.0, align 8
-  %stackalloc = alloca i8, align 1
-  store %main.kv.0 zeroinitializer, ptr %complit, align 8
-  call void @runtime.trackPointer(ptr nonnull %complit, ptr nonnull %stackalloc, ptr undef) #3
  call void @"main.foo$1"(%main.kv.0 zeroinitializer, ptr undef)
  ret void
 }
@@ -207,15 +203,10 @@ entry:
 ; Function Attrs: nounwind
 define internal void @"main.foo$1"(%main.kv.0 %b, ptr %context) unnamed_addr #2 {
 entry:
-  %b1 = alloca %main.kv.0, align 8
-  %stackalloc = alloca i8, align 1
-  store %main.kv.0 zeroinitializer, ptr %b1, align 8
-  call void @runtime.trackPointer(ptr nonnull %b1, ptr nonnull %stackalloc, ptr undef) #3
-  store %main.kv.0 %b, ptr %b1, align 8
  ret void
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -31,12 +31,12 @@ entry:
  ret void
 }

-; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
+; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

 declare void @runtime.chanSend(ptr dereferenceable_or_null(32), ptr, ptr dereferenceable_or_null(24), ptr) #1

-; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
+; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

 ; Function Attrs: nounwind
@@ -57,10 +57,7 @@ declare i1 @runtime.chanRecv(ptr dereferenceable_or_null(32), ptr, ptr dereferen
 ; Function Attrs: nounwind
 define hidden void @main.chanZeroSend(ptr dereferenceable_or_null(32) %ch, ptr %context) unnamed_addr #2 {
 entry:
-  %complit = alloca {}, align 8
  %chan.blockedList = alloca %runtime.channelBlockedList, align 8
-  %stackalloc = alloca i8, align 1
-  call void @runtime.trackPointer(ptr nonnull %complit, ptr nonnull %stackalloc, ptr undef) #4
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %chan.blockedList)
  call void @runtime.chanSend(ptr %ch, ptr null, ptr nonnull %chan.blockedList, ptr undef) #4
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %chan.blockedList)
@@ -110,8 +107,8 @@ select.body:                                      ; preds = %select.next

 declare { i32, i1 } @runtime.tryChanSelect(ptr, ptr, i32, i32, ptr) #1

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #3 = { argmemonly nocallback nofree nosync nounwind willreturn }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 attributes #4 = { nounwind }
@@ -37,9 +37,16 @@ entry:

 1:                                                ; preds = %entry
  call void @main.external(ptr undef) #4
+  br label %rundefers.block
+
+rundefers.after:                                  ; preds = %rundefers.end
+  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
+  ret void
+
+rundefers.block:                                  ; preds = %1
  br label %rundefers.loophead

-rundefers.loophead:                               ; preds = %3, %1
+rundefers.loophead:                               ; preds = %3, %rundefers.block
  %2 = load ptr, ptr %deferPtr, align 4
  %stackIsNil = icmp eq ptr %2, null
  br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop
@@ -66,8 +73,7 @@ rundefers.default:                                ; preds = %rundefers.loop
  unreachable

 rundefers.end:                                    ; preds = %rundefers.loophead
-  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
-  ret void
+  br label %rundefers.after

 recover:                                          ; preds = %rundefers.end3
  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
@@ -111,6 +117,8 @@ declare ptr @llvm.stacksave() #3

 declare void @runtime.setupDeferFrame(ptr dereferenceable_or_null(24), ptr, ptr) #2

+declare void @runtime.destroyDeferFrame(ptr dereferenceable_or_null(24), ptr) #2
+
 ; Function Attrs: nounwind
 define internal void @"main.deferSimple$1"(ptr %context) unnamed_addr #1 {
 entry:
@@ -118,8 +126,6 @@ entry:
  ret void
 }

-declare void @runtime.destroyDeferFrame(ptr dereferenceable_or_null(24), ptr) #2
-
 declare void @runtime.printint32(i32, ptr) #2

 ; Function Attrs: nounwind
@@ -146,9 +152,16 @@ entry:

 1:                                                ; preds = %entry
  call void @main.external(ptr undef) #4
+  br label %rundefers.block
+
+rundefers.after:                                  ; preds = %rundefers.end
+  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
+  ret void
+
+rundefers.block:                                  ; preds = %1
  br label %rundefers.loophead

-rundefers.loophead:                               ; preds = %4, %3, %1
+rundefers.loophead:                               ; preds = %4, %3, %rundefers.block
  %2 = load ptr, ptr %deferPtr, align 4
  %stackIsNil = icmp eq ptr %2, null
  br i1 %stackIsNil, label %rundefers.end, label %rundefers.loop
@@ -185,8 +198,7 @@ rundefers.default:                                ; preds = %rundefers.loop
  unreachable

 rundefers.end:                                    ; preds = %rundefers.loophead
-  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
-  ret void
+  br label %rundefers.after

 recover:                                          ; preds = %rundefers.end7
  call void @runtime.destroyDeferFrame(ptr nonnull %deferframe.buf, ptr undef) #4
@@ -0,0 +1,43 @@
+package main
+
+import "unsafe"
+
+//go:wasmimport modulename empty
+func empty()
+
+// ERROR: can only use //go:wasmimport on declarations
+//
+//go:wasmimport modulename implementation
+func implementation() {
+}
+
+type Uint uint32
+
+//go:wasmimport modulename validparam
+func validparam(a int32, b uint64, c float64, d unsafe.Pointer, e Uint)
+
+// ERROR: //go:wasmimport modulename invalidparam: unsupported parameter type int
+// ERROR: //go:wasmimport modulename invalidparam: unsupported parameter type string
+// ERROR: //go:wasmimport modulename invalidparam: unsupported parameter type []byte
+// ERROR: //go:wasmimport modulename invalidparam: unsupported parameter type *int32
+//
+//go:wasmimport modulename invalidparam
+func invalidparam(a int, b string, c []byte, d *int32)
+
+//go:wasmimport modulename validreturn
+func validreturn() int32
+
+// ERROR: //go:wasmimport modulename manyreturns: too many return values
+//
+//go:wasmimport modulename manyreturns
+func manyreturns() (int32, int32)
+
+// ERROR: //go:wasmimport modulename invalidreturn: unsupported result type int
+//
+//go:wasmimport modulename invalidreturn
+func invalidreturn() int
+
+// ERROR: //go:wasmimport modulename invalidUnsafePointerReturn: unsupported result type unsafe.Pointer
+//
+//go:wasmimport modulename invalidUnsafePointerReturn
+func invalidUnsafePointerReturn() unsafe.Pointer
@@ -93,6 +93,6 @@ entry:
  ret i8 %0
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
@@ -44,7 +44,7 @@ entry:
  ret void
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -21,8 +21,8 @@ target triple = "wasm32-unknown-wasi"
@main.slice3 = hidden global { ptr, i32, i32 } zeroinitializer, align 8
@"runtime/gc.layout:62-2000000000000001" = linkonce_odr unnamed_addr constant { i32, [8 x i8] } { i32 62, [8 x i8] c"\01\00\00\00\00\00\00 " }
@"runtime/gc.layout:62-0001" = linkonce_odr unnamed_addr constant { i32, [8 x i8] } { i32 62, [8 x i8] c"\01\00\00\00\00\00\00\00" }
-@"reflect/types.type:basic:complex128" = linkonce_odr constant { i8, ptr } { i8 16, ptr @"reflect/types.type:pointer:basic:complex128" }, align 4
-@"reflect/types.type:pointer:basic:complex128" = linkonce_odr constant { i8, i16, ptr } { i8 21, i16 0, ptr @"reflect/types.type:basic:complex128" }, align 4
+@"reflect/types.type:basic:complex128" = linkonce_odr constant { i8, ptr } { i8 80, ptr @"reflect/types.type:pointer:basic:complex128" }, align 4
+@"reflect/types.type:pointer:basic:complex128" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:basic:complex128" }, align 4

 ; Function Attrs: allockind("alloc,zeroed") allocsize(0)
 declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
@@ -135,7 +135,7 @@ entry:
  ret %runtime._interface %1
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -57,7 +57,7 @@ entry:
  ret ptr %s.data
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -0,0 +1,65 @@
+package main
+
+func min1(a int) int {
+	return min(a)
+}
+
+func min2(a, b int) int {
+	return min(a, b)
+}
+
+func min3(a, b, c int) int {
+	return min(a, b, c)
+}
+
+func min4(a, b, c, d int) int {
+	return min(a, b, c, d)
+}
+
+func minUint8(a, b uint8) uint8 {
+	return min(a, b)
+}
+
+func minUnsigned(a, b uint) uint {
+	return min(a, b)
+}
+
+func minFloat32(a, b float32) float32 {
+	return min(a, b)
+}
+
+func minFloat64(a, b float64) float64 {
+	return min(a, b)
+}
+
+func minString(a, b string) string {
+	return min(a, b)
+}
+
+func maxInt(a, b int) int {
+	return max(a, b)
+}
+
+func maxUint(a, b uint) uint {
+	return max(a, b)
+}
+
+func maxFloat32(a, b float32) float32 {
+	return max(a, b)
+}
+
+func maxString(a, b string) string {
+	return max(a, b)
+}
+
+func clearSlice(s []int) {
+	clear(s)
+}
+
+func clearZeroSizedSlice(s []struct{}) {
+	clear(s)
+}
+
+func clearMap(m map[string]int) {
+	clear(m)
+}
@@ -0,0 +1,179 @@
+; ModuleID = 'go1.21.go'
+source_filename = "go1.21.go"
+target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20"
+target triple = "wasm32-unknown-wasi"
+
+%runtime._string = type { ptr, i32 }
+
+; Function Attrs: allockind("alloc,zeroed") allocsize(0)
+declare noalias nonnull ptr @runtime.alloc(i32, ptr, ptr) #0
+
+declare void @runtime.trackPointer(ptr nocapture readonly, ptr, ptr) #1
+
+; Function Attrs: nounwind
+define hidden void @main.init(ptr %context) unnamed_addr #2 {
+entry:
+  ret void
+}
+
+; Function Attrs: nounwind
+define hidden i32 @main.min1(i32 %a, ptr %context) unnamed_addr #2 {
+entry:
+  ret i32 %a
+}
+
+; Function Attrs: nounwind
+define hidden i32 @main.min2(i32 %a, i32 %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i32 @llvm.smin.i32(i32 %a, i32 %b)
+  ret i32 %0
+}
+
+; Function Attrs: nounwind
+define hidden i32 @main.min3(i32 %a, i32 %b, i32 %c, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i32 @llvm.smin.i32(i32 %a, i32 %b)
+  %1 = call i32 @llvm.smin.i32(i32 %0, i32 %c)
+  ret i32 %1
+}
+
+; Function Attrs: nounwind
+define hidden i32 @main.min4(i32 %a, i32 %b, i32 %c, i32 %d, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i32 @llvm.smin.i32(i32 %a, i32 %b)
+  %1 = call i32 @llvm.smin.i32(i32 %0, i32 %c)
+  %2 = call i32 @llvm.smin.i32(i32 %1, i32 %d)
+  ret i32 %2
+}
+
+; Function Attrs: nounwind
+define hidden i8 @main.minUint8(i8 %a, i8 %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i8 @llvm.umin.i8(i8 %a, i8 %b)
+  ret i8 %0
+}
+
+; Function Attrs: nounwind
+define hidden i32 @main.minUnsigned(i32 %a, i32 %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i32 @llvm.umin.i32(i32 %a, i32 %b)
+  ret i32 %0
+}
+
+; Function Attrs: nounwind
+define hidden float @main.minFloat32(float %a, float %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = fcmp olt float %a, %b
+  %1 = select i1 %0, float %a, float %b
+  ret float %1
+}
+
+; Function Attrs: nounwind
+define hidden double @main.minFloat64(double %a, double %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = fcmp olt double %a, %b
+  %1 = select i1 %0, double %a, double %b
+  ret double %1
+}
+
+; Function Attrs: nounwind
+define hidden %runtime._string @main.minString(ptr %a.data, i32 %a.len, ptr %b.data, i32 %b.len, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = insertvalue %runtime._string zeroinitializer, ptr %a.data, 0
+  %1 = insertvalue %runtime._string %0, i32 %a.len, 1
+  %2 = insertvalue %runtime._string zeroinitializer, ptr %b.data, 0
+  %3 = insertvalue %runtime._string %2, i32 %b.len, 1
+  %stackalloc = alloca i8, align 1
+  %4 = call i1 @runtime.stringLess(ptr %a.data, i32 %a.len, ptr %b.data, i32 %b.len, ptr undef) #5
+  %5 = select i1 %4, %runtime._string %1, %runtime._string %3
+  %6 = extractvalue %runtime._string %5, 0
+  call void @runtime.trackPointer(ptr %6, ptr nonnull %stackalloc, ptr undef) #5
+  ret %runtime._string %5
+}
+
+declare i1 @runtime.stringLess(ptr, i32, ptr, i32, ptr) #1
+
+; Function Attrs: nounwind
+define hidden i32 @main.maxInt(i32 %a, i32 %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i32 @llvm.smax.i32(i32 %a, i32 %b)
+  ret i32 %0
+}
+
+; Function Attrs: nounwind
+define hidden i32 @main.maxUint(i32 %a, i32 %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = call i32 @llvm.umax.i32(i32 %a, i32 %b)
+  ret i32 %0
+}
+
+; Function Attrs: nounwind
+define hidden float @main.maxFloat32(float %a, float %b, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = fcmp ogt float %a, %b
+  %1 = select i1 %0, float %a, float %b
+  ret float %1
+}
+
+; Function Attrs: nounwind
+define hidden %runtime._string @main.maxString(ptr %a.data, i32 %a.len, ptr %b.data, i32 %b.len, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = insertvalue %runtime._string zeroinitializer, ptr %a.data, 0
+  %1 = insertvalue %runtime._string %0, i32 %a.len, 1
+  %2 = insertvalue %runtime._string zeroinitializer, ptr %b.data, 0
+  %3 = insertvalue %runtime._string %2, i32 %b.len, 1
+  %stackalloc = alloca i8, align 1
+  %4 = call i1 @runtime.stringLess(ptr %b.data, i32 %b.len, ptr %a.data, i32 %a.len, ptr undef) #5
+  %5 = select i1 %4, %runtime._string %1, %runtime._string %3
+  %6 = extractvalue %runtime._string %5, 0
+  call void @runtime.trackPointer(ptr %6, ptr nonnull %stackalloc, ptr undef) #5
+  ret %runtime._string %5
+}
+
+; Function Attrs: nounwind
+define hidden void @main.clearSlice(ptr %s.data, i32 %s.len, i32 %s.cap, ptr %context) unnamed_addr #2 {
+entry:
+  %0 = shl i32 %s.len, 2
+  call void @llvm.memset.p0.i32(ptr align 4 %s.data, i8 0, i32 %0, i1 false)
+  ret void
+}
+
+; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
+declare void @llvm.memset.p0.i32(ptr nocapture writeonly, i8, i32, i1 immarg) #3
+
+; Function Attrs: nounwind
+define hidden void @main.clearZeroSizedSlice(ptr %s.data, i32 %s.len, i32 %s.cap, ptr %context) unnamed_addr #2 {
+entry:
+  ret void
+}
+
+; Function Attrs: nounwind
+define hidden void @main.clearMap(ptr dereferenceable_or_null(40) %m, ptr %context) unnamed_addr #2 {
+entry:
+  call void @runtime.hashmapClear(ptr %m, ptr undef) #5
+  ret void
+}
+
+declare void @runtime.hashmapClear(ptr dereferenceable_or_null(40), ptr) #1
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare i32 @llvm.smin.i32(i32, i32) #4
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare i8 @llvm.umin.i8(i8, i8) #4
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare i32 @llvm.umin.i32(i32, i32) #4
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare i32 @llvm.smax.i32(i32, i32) #4
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+declare i32 @llvm.umax.i32(i32, i32) #4
+
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #3 = { nocallback nofree nounwind willreturn memory(argmem: write) }
+attributes #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
+attributes #5 = { nounwind }
@@ -21,7 +21,7 @@ entry:
 ; Function Attrs: nounwind
 define hidden void @main.regularFunctionGoroutine(ptr %context) unnamed_addr #2 {
 entry:
-  call void @"internal/task.start"(i32 ptrtoint (ptr @"main.regularFunction$gowrapper" to i32), ptr nonnull inttoptr (i32 5 to ptr), i32 16384, ptr undef) #9
+  call void @"internal/task.start"(i32 ptrtoint (ptr @"main.regularFunction$gowrapper" to i32), ptr nonnull inttoptr (i32 5 to ptr), i32 65536, ptr undef) #9
  ret void
 }

@@ -43,7 +43,7 @@ declare void @"internal/task.start"(i32, ptr, i32, ptr) #1
 ; Function Attrs: nounwind
 define hidden void @main.inlineFunctionGoroutine(ptr %context) unnamed_addr #2 {
 entry:
-  call void @"internal/task.start"(i32 ptrtoint (ptr @"main.inlineFunctionGoroutine$1$gowrapper" to i32), ptr nonnull inttoptr (i32 5 to ptr), i32 16384, ptr undef) #9
+  call void @"internal/task.start"(i32 ptrtoint (ptr @"main.inlineFunctionGoroutine$1$gowrapper" to i32), ptr nonnull inttoptr (i32 5 to ptr), i32 65536, ptr undef) #9
  ret void
 }

@@ -76,7 +76,7 @@ entry:
  store i32 5, ptr %0, align 4
  %1 = getelementptr inbounds { i32, ptr }, ptr %0, i32 0, i32 1
  store ptr %n, ptr %1, align 4
-  call void @"internal/task.start"(i32 ptrtoint (ptr @"main.closureFunctionGoroutine$1$gowrapper" to i32), ptr nonnull %0, i32 16384, ptr undef) #9
+  call void @"internal/task.start"(i32 ptrtoint (ptr @"main.closureFunctionGoroutine$1$gowrapper" to i32), ptr nonnull %0, i32 65536, ptr undef) #9
  %2 = load i32, ptr %n, align 4
  call void @runtime.printint32(i32 %2, ptr undef) #9
  ret void
@@ -113,7 +113,7 @@ entry:
  store ptr %fn.context, ptr %1, align 4
  %2 = getelementptr inbounds { i32, ptr, ptr }, ptr %0, i32 0, i32 2
  store ptr %fn.funcptr, ptr %2, align 4
-  call void @"internal/task.start"(i32 ptrtoint (ptr @main.funcGoroutine.gowrapper to i32), ptr nonnull %0, i32 16384, ptr undef) #9
+  call void @"internal/task.start"(i32 ptrtoint (ptr @main.funcGoroutine.gowrapper to i32), ptr nonnull %0, i32 65536, ptr undef) #9
  ret void
 }

@@ -167,7 +167,7 @@ entry:
  store i32 4, ptr %.repack1, align 4
  %2 = getelementptr inbounds { ptr, %runtime._string, ptr }, ptr %0, i32 0, i32 2
  store ptr %itf.typecode, ptr %2, align 4
-  call void @"internal/task.start"(i32 ptrtoint (ptr @"interface:{Print:func:{basic:string}{}}.Print$invoke$gowrapper" to i32), ptr nonnull %0, i32 16384, ptr undef) #9
+  call void @"internal/task.start"(i32 ptrtoint (ptr @"interface:{Print:func:{basic:string}{}}.Print$invoke$gowrapper" to i32), ptr nonnull %0, i32 65536, ptr undef) #9
  ret void
 }

@@ -188,13 +188,13 @@ entry:
  unreachable
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #3 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="main.regularFunction" }
-attributes #4 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="main.inlineFunctionGoroutine$1" }
-attributes #5 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="main.closureFunctionGoroutine$1" }
-attributes #6 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper" }
-attributes #7 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="reflect/methods.Print(string)" "tinygo-methods"="reflect/methods.Print(string)" }
-attributes #8 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="interface:{Print:func:{basic:string}{}}.Print$invoke" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #3 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="main.regularFunction" }
+attributes #4 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="main.inlineFunctionGoroutine$1" }
+attributes #5 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="main.closureFunctionGoroutine$1" }
+attributes #6 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper" }
+attributes #7 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="reflect/methods.Print(string)" "tinygo-methods"="reflect/methods.Print(string)" }
+attributes #8 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-gowrapper"="interface:{Print:func:{basic:string}{}}.Print$invoke" }
 attributes #9 = { nounwind }
@@ -6,15 +6,15 @@ target triple = "wasm32-unknown-wasi"
 %runtime._interface = type { ptr, ptr }
 %runtime._string = type { ptr, i32 }

-@"reflect/types.type:basic:int" = linkonce_odr constant { i8, ptr } { i8 2, ptr @"reflect/types.type:pointer:basic:int" }, align 4
-@"reflect/types.type:pointer:basic:int" = linkonce_odr constant { i8, i16, ptr } { i8 21, i16 0, ptr @"reflect/types.type:basic:int" }, align 4
-@"reflect/types.type:pointer:named:error" = linkonce_odr constant { i8, i16, ptr } { i8 21, i16 0, ptr @"reflect/types.type:named:error" }, align 4
-@"reflect/types.type:named:error" = linkonce_odr constant { i8, i16, ptr, ptr, ptr, [7 x i8] } { i8 52, i16 1, ptr @"reflect/types.type:pointer:named:error", ptr @"reflect/types.type:interface:{Error:func:{}{basic:string}}", ptr @"reflect/types.type.pkgpath.empty", [7 x i8] c".error\00" }, align 4
+@"reflect/types.type:basic:int" = linkonce_odr constant { i8, ptr } { i8 -62, ptr @"reflect/types.type:pointer:basic:int" }, align 4
+@"reflect/types.type:pointer:basic:int" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:basic:int" }, align 4
+@"reflect/types.type:pointer:named:error" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:named:error" }, align 4
+@"reflect/types.type:named:error" = linkonce_odr constant { i8, i16, ptr, ptr, ptr, [7 x i8] } { i8 116, i16 0, ptr @"reflect/types.type:pointer:named:error", ptr @"reflect/types.type:interface:{Error:func:{}{basic:string}}", ptr @"reflect/types.type.pkgpath.empty", [7 x i8] c".error\00" }, align 4
@"reflect/types.type.pkgpath.empty" = linkonce_odr unnamed_addr constant [1 x i8] zeroinitializer, align 1
-@"reflect/types.type:interface:{Error:func:{}{basic:string}}" = linkonce_odr constant { i8, ptr } { i8 20, ptr @"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" }, align 4
-@"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" = linkonce_odr constant { i8, i16, ptr } { i8 21, i16 0, ptr @"reflect/types.type:interface:{Error:func:{}{basic:string}}" }, align 4
-@"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}" = linkonce_odr constant { i8, i16, ptr } { i8 21, i16 0, ptr @"reflect/types.type:interface:{String:func:{}{basic:string}}" }, align 4
-@"reflect/types.type:interface:{String:func:{}{basic:string}}" = linkonce_odr constant { i8, ptr } { i8 20, ptr @"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}" }, align 4
+@"reflect/types.type:interface:{Error:func:{}{basic:string}}" = linkonce_odr constant { i8, ptr } { i8 84, ptr @"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" }, align 4
+@"reflect/types.type:pointer:interface:{Error:func:{}{basic:string}}" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:interface:{Error:func:{}{basic:string}}" }, align 4
+@"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}" = linkonce_odr constant { i8, i16, ptr } { i8 -43, i16 0, ptr @"reflect/types.type:interface:{String:func:{}{basic:string}}" }, align 4
+@"reflect/types.type:interface:{String:func:{}{basic:string}}" = linkonce_odr constant { i8, ptr } { i8 84, ptr @"reflect/types.type:pointer:interface:{String:func:{}{basic:string}}" }, align 4
@"reflect/types.typeid:basic:int" = external constant i8

 ; Function Attrs: allockind("alloc,zeroed") allocsize(0)
@@ -130,11 +130,11 @@ entry:

 declare %runtime._string @"interface:{Error:func:{}{basic:string}}.Error$invoke"(ptr, ptr, ptr) #6

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #3 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-methods"="reflect/methods.Error() string" }
-attributes #4 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-methods"="reflect/methods.String() string" }
-attributes #5 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="main.$methods.foo(int) uint8" "tinygo-methods"="reflect/methods.String() string; main.$methods.foo(int) uint8" }
-attributes #6 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="reflect/methods.Error() string" "tinygo-methods"="reflect/methods.Error() string" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #3 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-methods"="reflect/methods.Error() string" }
+attributes #4 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-methods"="reflect/methods.String() string" }
+attributes #5 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="main.$methods.foo(int) uint8" "tinygo-methods"="reflect/methods.String() string; main.$methods.foo(int) uint8" }
+attributes #6 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "tinygo-invoke"="reflect/methods.Error() string" "tinygo-methods"="reflect/methods.Error() string" }
 attributes #7 = { nounwind }
@@ -44,7 +44,7 @@ entry:
  ret ptr %x
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -62,8 +62,17 @@ func exportedFunctionInSection() {
 //go:wasmimport modulename import1
 func declaredImport()

-//go:wasmimport modulename import2
-func definedImport() {
+// Legacy way of importing a function.
+//
+//go:wasm-module foobar
+//export imported
+func foobarImport()
+
+// The wasm-module pragma is not functional here, but it should be safe.
+//
+//go:wasm-module foobar
+//export exported
+func foobarExportModule() {
 }

 // This function should not: it's only a declaration and not a definition.
@@ -6,7 +6,7 @@ target triple = "wasm32-unknown-wasi"
@extern_global = external global [0 x i8], align 1
@main.alignedGlobal = hidden global [4 x i32] zeroinitializer, align 32
@main.alignedGlobal16 = hidden global [4 x i32] zeroinitializer, align 16
-@llvm.used = appending global [2 x ptr] [ptr @extern_func, ptr @exportedFunctionInSection]
+@llvm.used = appending global [3 x ptr] [ptr @extern_func, ptr @exportedFunctionInSection, ptr @exported]
@main.globalInSection = hidden global i32 0, section ".special_global_section", align 4
@undefinedGlobalNotInSection = external global i32, align 4
@main.multipleGlobalPragmas = hidden global i32 0, section ".global_section", align 1024
@@ -62,19 +62,23 @@ entry:

 declare void @main.declaredImport() #7

+declare void @imported() #8
+
 ; Function Attrs: nounwind
-define hidden void @main.definedImport(ptr %context) unnamed_addr #2 {
+define void @exported() #9 {
 entry:
  ret void
 }

 declare void @main.undefinedFunctionNotInSection(ptr) #1

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #3 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="extern_func" "wasm-import-module"="env" "wasm-import-name"="extern_func" }
-attributes #4 = { inlinehint nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #5 = { noinline nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #6 = { noinline nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="exportedFunctionInSection" "wasm-import-module"="env" "wasm-import-name"="exportedFunctionInSection" }
-attributes #7 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" "wasm-import-module"="modulename" "wasm-import-name"="import1" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #3 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="extern_func" }
+attributes #4 = { inlinehint nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #5 = { noinline nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #6 = { noinline nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="exportedFunctionInSection" }
+attributes #7 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "wasm-import-module"="modulename" "wasm-import-name"="import1" }
+attributes #8 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "wasm-import-module"="foobar" "wasm-import-name"="imported" }
+attributes #9 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" "wasm-export-name"="exported" }
@@ -322,7 +322,7 @@ unsafe.Slice.throw:                               ; preds = %entry
  unreachable
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -97,7 +97,7 @@ lookup.throw:                                     ; preds = %entry
  unreachable
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
 attributes #3 = { nounwind }
@@ -21,14 +21,9 @@ define hidden i32 @main.testZeroGet(ptr dereferenceable_or_null(40) %m, i1 %s.b1
 entry:
  %hashmap.key = alloca %main.hasPadding, align 8
  %hashmap.value = alloca i32, align 4
-  %s = alloca %main.hasPadding, align 8
  %0 = insertvalue %main.hasPadding zeroinitializer, i1 %s.b1, 0
  %1 = insertvalue %main.hasPadding %0, i32 %s.i, 1
  %2 = insertvalue %main.hasPadding %1, i1 %s.b2, 2
-  %stackalloc = alloca i8, align 1
-  store %main.hasPadding zeroinitializer, ptr %s, align 8
-  call void @runtime.trackPointer(ptr nonnull %s, ptr nonnull %stackalloc, ptr undef) #5
-  store %main.hasPadding %2, ptr %s, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
  call void @llvm.lifetime.start.p0(i64 12, ptr nonnull %hashmap.key)
  store %main.hasPadding %2, ptr %hashmap.key, align 8
@@ -43,14 +38,14 @@ entry:
  ret i32 %6
 }

-; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
+; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #4

 declare void @runtime.memzero(ptr, i32, ptr) #1

 declare i1 @runtime.hashmapBinaryGet(ptr dereferenceable_or_null(40), ptr, ptr, i32, ptr) #1

-; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
+; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #4

 ; Function Attrs: noinline nounwind
@@ -58,14 +53,9 @@ define hidden void @main.testZeroSet(ptr dereferenceable_or_null(40) %m, i1 %s.b
 entry:
  %hashmap.key = alloca %main.hasPadding, align 8
  %hashmap.value = alloca i32, align 4
-  %s = alloca %main.hasPadding, align 8
  %0 = insertvalue %main.hasPadding zeroinitializer, i1 %s.b1, 0
  %1 = insertvalue %main.hasPadding %0, i32 %s.i, 1
  %2 = insertvalue %main.hasPadding %1, i1 %s.b2, 2
-  %stackalloc = alloca i8, align 1
-  store %main.hasPadding zeroinitializer, ptr %s, align 8
-  call void @runtime.trackPointer(ptr nonnull %s, ptr nonnull %stackalloc, ptr undef) #5
-  store %main.hasPadding %2, ptr %s, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
  store i32 5, ptr %hashmap.value, align 4
  call void @llvm.lifetime.start.p0(i64 12, ptr nonnull %hashmap.key)
@@ -87,24 +77,13 @@ define hidden i32 @main.testZeroArrayGet(ptr dereferenceable_or_null(40) %m, [2
 entry:
  %hashmap.key = alloca [2 x %main.hasPadding], align 8
  %hashmap.value = alloca i32, align 4
-  %s1 = alloca [2 x %main.hasPadding], align 8
-  %stackalloc = alloca i8, align 1
-  store %main.hasPadding zeroinitializer, ptr %s1, align 8
-  %s1.repack2 = getelementptr inbounds [2 x %main.hasPadding], ptr %s1, i32 0, i32 1
-  store %main.hasPadding zeroinitializer, ptr %s1.repack2, align 4
-  call void @runtime.trackPointer(ptr nonnull %s1, ptr nonnull %stackalloc, ptr undef) #5
-  %s.elt = extractvalue [2 x %main.hasPadding] %s, 0
-  store %main.hasPadding %s.elt, ptr %s1, align 8
-  %s1.repack3 = getelementptr inbounds [2 x %main.hasPadding], ptr %s1, i32 0, i32 1
-  %s.elt4 = extractvalue [2 x %main.hasPadding] %s, 1
-  store %main.hasPadding %s.elt4, ptr %s1.repack3, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %hashmap.key)
-  %s.elt7 = extractvalue [2 x %main.hasPadding] %s, 0
-  store %main.hasPadding %s.elt7, ptr %hashmap.key, align 8
-  %hashmap.key.repack8 = getelementptr inbounds [2 x %main.hasPadding], ptr %hashmap.key, i32 0, i32 1
-  %s.elt9 = extractvalue [2 x %main.hasPadding] %s, 1
-  store %main.hasPadding %s.elt9, ptr %hashmap.key.repack8, align 4
+  %s.elt = extractvalue [2 x %main.hasPadding] %s, 0
+  store %main.hasPadding %s.elt, ptr %hashmap.key, align 8
+  %hashmap.key.repack1 = getelementptr inbounds [2 x %main.hasPadding], ptr %hashmap.key, i32 0, i32 1
+  %s.elt2 = extractvalue [2 x %main.hasPadding] %s, 1
+  store %main.hasPadding %s.elt2, ptr %hashmap.key.repack1, align 4
  %0 = getelementptr inbounds i8, ptr %hashmap.key, i32 1
  call void @runtime.memzero(ptr nonnull %0, i32 3, ptr undef) #5
  %1 = getelementptr inbounds i8, ptr %hashmap.key, i32 9
@@ -125,25 +104,14 @@ define hidden void @main.testZeroArraySet(ptr dereferenceable_or_null(40) %m, [2
 entry:
  %hashmap.key = alloca [2 x %main.hasPadding], align 8
  %hashmap.value = alloca i32, align 4
-  %s1 = alloca [2 x %main.hasPadding], align 8
-  %stackalloc = alloca i8, align 1
-  store %main.hasPadding zeroinitializer, ptr %s1, align 8
-  %s1.repack2 = getelementptr inbounds [2 x %main.hasPadding], ptr %s1, i32 0, i32 1
-  store %main.hasPadding zeroinitializer, ptr %s1.repack2, align 4
-  call void @runtime.trackPointer(ptr nonnull %s1, ptr nonnull %stackalloc, ptr undef) #5
-  %s.elt = extractvalue [2 x %main.hasPadding] %s, 0
-  store %main.hasPadding %s.elt, ptr %s1, align 8
-  %s1.repack3 = getelementptr inbounds [2 x %main.hasPadding], ptr %s1, i32 0, i32 1
-  %s.elt4 = extractvalue [2 x %main.hasPadding] %s, 1
-  store %main.hasPadding %s.elt4, ptr %s1.repack3, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %hashmap.value)
  store i32 5, ptr %hashmap.value, align 4
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %hashmap.key)
-  %s.elt7 = extractvalue [2 x %main.hasPadding] %s, 0
-  store %main.hasPadding %s.elt7, ptr %hashmap.key, align 8
-  %hashmap.key.repack8 = getelementptr inbounds [2 x %main.hasPadding], ptr %hashmap.key, i32 0, i32 1
-  %s.elt9 = extractvalue [2 x %main.hasPadding] %s, 1
-  store %main.hasPadding %s.elt9, ptr %hashmap.key.repack8, align 4
+  %s.elt = extractvalue [2 x %main.hasPadding] %s, 0
+  store %main.hasPadding %s.elt, ptr %hashmap.key, align 8
+  %hashmap.key.repack1 = getelementptr inbounds [2 x %main.hasPadding], ptr %hashmap.key, i32 0, i32 1
+  %s.elt2 = extractvalue [2 x %main.hasPadding] %s, 1
+  store %main.hasPadding %s.elt2, ptr %hashmap.key.repack1, align 4
  %0 = getelementptr inbounds i8, ptr %hashmap.key, i32 1
  call void @runtime.memzero(ptr nonnull %0, i32 3, ptr undef) #5
  %1 = getelementptr inbounds i8, ptr %hashmap.key, i32 9
@@ -164,9 +132,9 @@ entry:
  ret void
 }

-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #1 = { "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #3 = { noinline nounwind "target-features"="+bulk-memory,+nontrapping-fptoint,+sign-ext" }
-attributes #4 = { argmemonly nocallback nofree nosync nounwind willreturn }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #1 = { "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #3 = { noinline nounwind "target-features"="+bulk-memory,+mutable-globals,+nontrapping-fptoint,+sign-ext" }
+attributes #4 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 attributes #5 = { nounwind }
@@ -16,7 +16,7 @@ I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .

 .PHONY: help
 help:
-	@echo "Please use \`make <target>' where <target> is one of"
+	@echo "Please use \`$(MAKE) <target>' where <target> is one of"
 	@echo "  html       to make standalone HTML files"
 	@echo "  dirhtml    to make HTML files named index.html in directories"
 	@echo "  singlehtml to make a single large HTML file"
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1703068421,
+        "narHash": "sha256-WSw5Faqlw75McIflnl5v7qVD/B3S2sLh+968bpOGrWA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d65bceaee0fb1e64363f7871bc43dc1c6ecad99f",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-23.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
@@ -0,0 +1,86 @@
+# A Nix flake file, mainly intended for developing TinyGo.
+# You can download Nix here, for use on your Linux or macOS system:
+#   https://nixos.org/download.html
+# After you have installed Nix, you can enter the development environment as
+# follows:
+#
+#   nix develop
+#
+# This drops you into a bash shell, where you can install TinyGo simply using
+# the following command:
+#
+#   go install
+#
+# That's all! Assuming you've set up your $PATH correctly, you can now use the
+# tinygo command as usual:
+#
+#   tinygo version
+#
+# But you'll need a bit more to make TinyGo actually able to compile code:
+#
+#   make llvm-source                        # fetch compiler-rt
+#   git submodule update --init --recursive # fetch lots of other libraries and SVD files
+#   make gen-device -j4                     # build src/device/*/*.go files
+#   make wasi-libc                          # build support for wasi/wasm
+#
+# With this, you should have an environment that can compile anything - except
+# for the Xtensa architecture (ESP8266/ESP32) because support for that lives in
+# a separate LLVM fork.
+#
+# You can also do many other things from this environment. Building and flashing
+# should work as you're used to: it's not a VM or container so there are no
+# access restrictions and you're running in the same host environment - just
+# with a slightly different set of tools available.
+{
+  inputs = {
+    # Use a recent stable release, but fix the version to make it reproducible.
+    # This version should be updated from time to time.
+    nixpkgs.url = "nixpkgs/nixos-23.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      with pkgs;
+      {
+        devShells.default = mkShell {
+          buildInputs = [
+            # These dependencies are required for building tinygo (go install).
+            go
+            llvmPackages_17.llvm
+            llvmPackages_17.libclang
+            llvmPackages_17.libcxx
+            # Additional dependencies needed at runtime, for building and/or
+            # flashing.
+            llvmPackages_17.lld
+            avrdude
+            binaryen
+            # Additional dependencies needed for on-chip debugging.
+            # These tools are rather big (especially GDB) and not frequently
+            # used, so are commented out. On-chip debugging is still possible if
+            # these tools are available in the host environment.
+            #gdb
+            #openocd
+          ];
+          shellHook= ''
+            # Configure CLANG, LLVM_AR, and LLVM_NM for `make wasi-libc`.
+            # Without setting these explicitly, Homebrew versions might be used
+            # or the default `ar` and `nm` tools might be used (which don't
+            # support wasi).
+            export CLANG="clang-17 -resource-dir ${llvmPackages_17.clang.cc.lib}/lib/clang/17"
+            export LLVM_AR=llvm-ar
+            export LLVM_NM=llvm-nm
+
+            # Make `make smoketest` work (the default is `md5`, while Nix only
+            # has `md5sum`).
+            export MD5SUM=md5sum
+
+            # Ugly hack to make the Clang resources directory available.
+            export GOFLAGS="\"-ldflags=-X github.com/tinygo-org/tinygo/goenv.clangResourceDir=${llvmPackages_17.clang.cc.lib}/lib/clang/17"\"
+          '';
+        };
+      }
+    );
+}
@@ -13,11 +13,13 @@ require (
 	github.com/marcinbor85/gohex v0.0.0-20200531091804-343a4b548892
 	github.com/mattn/go-colorable v0.1.8
 	github.com/mattn/go-tty v0.0.4
-	go.bug.st/serial v1.3.5
-	golang.org/x/sys v0.4.0
-	golang.org/x/tools v0.5.1-0.20230114154351-e035d0c426c8
+	github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3
+	go.bug.st/serial v1.6.0
+	golang.org/x/net v0.20.0
+	golang.org/x/sys v0.16.0
+	golang.org/x/tools v0.17.0
 	gopkg.in/yaml.v2 v2.4.0
-	tinygo.org/x/go-llvm v0.0.0-20221028183034-8341240c0b32
+	tinygo.org/x/go-llvm v0.0.0-20240106122909-c2c543540318
 )

 require (
@@ -29,4 +31,5 @@ require (
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-isatty v0.0.12 // indirect
+	golang.org/x/text v0.14.0 // indirect
 )
@@ -43,10 +43,14 @@ github.com/mattn/go-tty v0.0.4/go.mod h1:u5GGXBtZU6RQoKV8gY5W6UhMudbR5vXnUe7j3px
 github.com/orisano/pixelmatch v0.0.0-20210112091706-4fa4c7ba91d5 h1:1SoBaSPudixRecmlHXb/GxmaD3fLMtHIDN13QujwQuc=
 github.com/orisano/pixelmatch v0.0.0-20210112091706-4fa4c7ba91d5/go.mod h1:nZgzbfBr3hhjoZnS66nKrHmduYNpc34ny7RK4z5/HM0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3 h1:aQKxg3+2p+IFXXg97McgDGT5zcMrQoi0EICZs8Pgchs=
+github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3/go.mod h1:9/etS5gpQq9BJsJMWg1wpLbfuSnkm8dPF6FdW2JXVhA=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-go.bug.st/serial v1.3.5 h1:k50SqGZCnHZ2MiBQgzccXWG+kd/XpOs1jUljpDDKzaE=
-go.bug.st/serial v1.3.5/go.mod h1:z8CesKorE90Qr/oRSJiEuvzYRKol9r/anJZEb5kt304=
-golang.org/x/mod v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
+go.bug.st/serial v1.6.0 h1:mAbRGN4cKE2J5gMwsMHC2KQisdLRQssO9WSM+rbZJ8A=
+go.bug.st/serial v1.6.0/go.mod h1:UABfsluHAiaNI+La2iESysd9Vetq7VRdpxvjx7CmmOE=
+golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0=
+golang.org/x/net v0.20.0 h1:aCL9BSgETF1k+blQaYUBx9hJ9LOGP3gAVemcZlf1Kpo=
+golang.org/x/net v0.20.0/go.mod h1:z8BVo6PvndSri0LbOE3hAn0apkU+1YvI6E70E9jsnvY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -54,14 +58,16 @@ golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201207223542-d4d67f95c62d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20211124211545-fe61309f8881/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
-golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/tools v0.5.1-0.20230114154351-e035d0c426c8 h1:LHoToPgySGSr2NcUHbjENAidHz38RkKaNmmntwn9TjI=
-golang.org/x/tools v0.5.1-0.20230114154351-e035d0c426c8/go.mod h1:N+Kgy78s5I24c24dU8OfWNEotWjutIs8SnJvn5IDq+k=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/tools v0.17.0 h1:FvmRgNOcs3kOa+T20R1uhfP9F6HgG2mfxDv1vrx1Htc=
+golang.org/x/tools v0.17.0/go.mod h1:xsh6VxdV005rRVaS6SSAf9oiAqljS7UZUacMZ8Bnsps=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-tinygo.org/x/go-llvm v0.0.0-20221028183034-8341240c0b32 h1:LvdmoXncO43m2cws1chRB2hkLBAxfN6CbSjDI7+gk4Y=
-tinygo.org/x/go-llvm v0.0.0-20221028183034-8341240c0b32/go.mod h1:GFbusT2VTA4I+l4j80b17KFK+6whv69Wtny5U+T8RR0=
+tinygo.org/x/go-llvm v0.0.0-20240106122909-c2c543540318 h1:4KjZvPtcN1UwobevcGbdzeinx0L1i8HDdJu84bu7NI8=
+tinygo.org/x/go-llvm v0.0.0-20240106122909-c2c543540318/go.mod h1:GFbusT2VTA4I+l4j80b17KFK+6whv69Wtny5U+T8RR0=
@@ -4,15 +4,18 @@ package goenv

 import (
 	"bytes"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io/fs"
 	"os"
 	"os/exec"
-	"os/user"
 	"path/filepath"
 	"runtime"
 	"strings"
+	"sync"
+
+	"tinygo.org/x/go-llvm"
 )

 // Keys is a slice of all available environment variable keys.
@@ -32,11 +35,67 @@ func init() {
 	}
 }

+// Set to true if we're linking statically against LLVM.
+var hasBuiltinTools = false
+
 // TINYGOROOT is the path to the final location for checking tinygo files. If
 // unset (by a -X ldflag), then sourceDir() will fallback to the original build
 // directory.
 var TINYGOROOT string

+// If a particular Clang resource dir must always be used and TinyGo can't
+// figure out the directory using heuristics, this global can be set using a
+// linker flag.
+// This is needed for Nix.
+var clangResourceDir string
+
+// Variables read from a `go env` command invocation.
+var goEnvVars struct {
+	GOPATH    string
+	GOROOT    string
+	GOVERSION string
+}
+
+var goEnvVarsOnce sync.Once
+var goEnvVarsErr error // error returned from cmd.Run
+
+// Make sure goEnvVars is fresh. This can be called multiple times, the first
+// time will update all environment variables in goEnvVars.
+func readGoEnvVars() error {
+	goEnvVarsOnce.Do(func() {
+		cmd := exec.Command("go", "env", "-json", "GOPATH", "GOROOT", "GOVERSION")
+		output, err := cmd.Output()
+		if err != nil {
+			// Check for "command not found" error.
+			if execErr, ok := err.(*exec.Error); ok {
+				goEnvVarsErr = fmt.Errorf("could not find '%s' command: %w", execErr.Name, execErr.Err)
+				return
+			}
+			// It's perhaps a bit ugly to handle this error here, but I couldn't
+			// think of a better place further up in the call chain.
+			if exitErr, ok := err.(*exec.ExitError); ok && exitErr.ExitCode() != 0 {
+				if len(exitErr.Stderr) != 0 {
+					// The 'go' command exited with an error message. Print that
+					// message and exit, so we behave in a similar way.
+					os.Stderr.Write(exitErr.Stderr)
+					os.Exit(exitErr.ExitCode())
+				}
+			}
+			// Other errors. Not sure whether there are any, but just in case.
+			goEnvVarsErr = err
+			return
+		}
+		err = json.Unmarshal(output, &goEnvVars)
+		if err != nil {
+			// This should never happen if we have a sane Go toolchain
+			// installed.
+			goEnvVarsErr = fmt.Errorf("unexpected error while unmarshalling `go env` output: %w", err)
+		}
+	})
+
+	return goEnvVarsErr
+}
+
 // Get returns a single environment variable, possibly calculating it on-demand.
 // The empty string is returned for unknown environment variables.
 func Get(name string) string {
@@ -70,15 +129,11 @@ func Get(name string) string {
 		// especially when floating point instructions are involved.
 		return "6"
 	case "GOROOT":
-		return getGoroot()
+		readGoEnvVars()
+		return goEnvVars.GOROOT
 	case "GOPATH":
-		if dir := os.Getenv("GOPATH"); dir != "" {
-			return dir
-		}
-
-		// fallback
-		home := getHomeDir()
-		return filepath.Join(home, "go")
+		readGoEnvVars()
+		return goEnvVars.GOPATH
 	case "GOCACHE":
 		// Get the cache directory, usually ~/.cache/tinygo
 		dir, err := os.UserCacheDir()
@@ -87,11 +142,8 @@ func Get(name string) string {
 		}
 		return filepath.Join(dir, "tinygo")
 	case "CGO_ENABLED":
-		val := os.Getenv("CGO_ENABLED")
-		if val == "1" || val == "0" {
-			return val
-		}
-		// Default to enabling CGo.
+		// Always enable CGo. It is required by a number of targets, including
+		// macOS and the rp2040.
 		return "1"
 	case "TINYGOROOT":
 		return sourceDir()
@@ -241,92 +293,94 @@ func isSourceDir(root string) bool {
 	return err == nil
 }

-func getHomeDir() string {
-	u, err := user.Current()
-	if err != nil {
-		panic("cannot get current user: " + err.Error())
-	}
-	if u.HomeDir == "" {
-		// This is very unlikely, so panic here.
-		// Not the nicest solution, however.
-		panic("could not find home directory")
-	}
-	return u.HomeDir
-}
-
-// getGoroot returns an appropriate GOROOT from various sources. If it can't be
-// found, it returns an empty string.
-func getGoroot() string {
-	// An explicitly set GOROOT always has preference.
-	goroot := os.Getenv("GOROOT")
-	if goroot != "" {
-		// Convert to the standard GOROOT being referenced, if it's a TinyGo cache.
-		return getStandardGoroot(goroot)
+// ClangResourceDir returns the clang resource dir if available. This is the
+// -resource-dir flag. If it isn't available, an empty string is returned and
+// -resource-dir should be left unset.
+// The libclang flag must be set if the resource dir is read for use by
+// libclang.
+// In that case, the resource dir is always returned (even when linking
+// dynamically against LLVM) because libclang always needs this directory.
+func ClangResourceDir(libclang bool) string {
+	if clangResourceDir != "" {
+		// The resource dir is forced to a particular value at build time.
+		// This is needed on Nix for example, where Clang and libclang don't
+		// know their own resource dir.
+		// Also see:
+		// https://discourse.nixos.org/t/why-is-the-clang-resource-dir-split-in-a-separate-package/34114
+		return clangResourceDir
 	}

-	// Check for the location of the 'go' binary and base GOROOT on that.
-	binpath, err := exec.LookPath("go")
-	if err == nil {
-		binpath, err = filepath.EvalSymlinks(binpath)
-		if err == nil {
-			goroot := filepath.Dir(filepath.Dir(binpath))
-			if isGoroot(goroot) {
-				return goroot
-			}
+	if !hasBuiltinTools && !libclang {
+		// Using external tools, so the resource dir doesn't need to be
+		// specified. Clang knows where to find it.
+		return ""
+	}
+
+	// Check whether we're running from a TinyGo release directory.
+	// This is the case for release binaries on GitHub.
+	root := Get("TINYGOROOT")
+	releaseHeaderDir := filepath.Join(root, "lib", "clang")
+	if _, err := os.Stat(releaseHeaderDir); !errors.Is(err, fs.ErrNotExist) {
+		return releaseHeaderDir
+	}
+
+	if hasBuiltinTools {
+		// We are statically linked to LLVM.
+		// Check whether we're running from the source directory.
+		// This typically happens when TinyGo was built using `make` as part of
+		// development.
+		llvmMajor := strings.Split(llvm.Version, ".")[0]
+		buildResourceDir := filepath.Join(root, "llvm-build", "lib", "clang", llvmMajor)
+		if _, err := os.Stat(buildResourceDir); !errors.Is(err, fs.ErrNotExist) {
+			return buildResourceDir
+		}
+	} else {
+		// We use external tools, either when installed using `go install` or
+		// when packaged in a Linux distribution (Linux distros typically prefer
+		// dynamic linking).
+		// Try to detect the system clang resources directory.
+		resourceDir := findSystemClangResources(root)
+		if resourceDir != "" {
+			return resourceDir
 		}
 	}

-	// Check what GOROOT was at compile time.
-	if isGoroot(runtime.GOROOT()) {
-		return runtime.GOROOT()
-	}
-
-	// Check for some standard locations, as a last resort.
-	var candidates []string
-	switch runtime.GOOS {
-	case "linux":
-		candidates = []string{
-			"/usr/local/go",     // manually installed
-			"/usr/lib/go",       // from the distribution
-			"/snap/go/current/", // installed using snap
-		}
-	case "darwin":
-		candidates = []string{
-			"/usr/local/go",             // manually installed
-			"/usr/local/opt/go/libexec", // from Homebrew
-		}
-	}
-
-	for _, candidate := range candidates {
-		if isGoroot(candidate) {
-			return candidate
-		}
-	}
-
-	// Can't find GOROOT...
+	// Resource directory not found.
 	return ""
 }

-// isGoroot checks whether the given path looks like a GOROOT.
-func isGoroot(goroot string) bool {
-	_, err := os.Stat(filepath.Join(goroot, "src", "runtime", "internal", "sys", "zversion.go"))
-	return err == nil
-}
+// Find the Clang resource dir on this particular system.
+// Return the empty string when they aren't found.
+func findSystemClangResources(TINYGOROOT string) string {
+	llvmMajor := strings.Split(llvm.Version, ".")[0]

-// getStandardGoroot returns the physical path to a real, standard Go GOROOT
-// implied by the given path.
-// If the given path appears to be a TinyGo cached GOROOT, it returns the path
-// referenced by symlinks contained in the cache. Otherwise, it returns the
-// given path as-is.
-func getStandardGoroot(path string) string {
-	// Check if the "bin" subdirectory of our given GOROOT is a symlink, and then
-	// return the _parent_ directory of its destination.
-	if dest, err := os.Readlink(filepath.Join(path, "bin")); nil == err {
-		// Clean the destination to remove any trailing slashes, so that
-		// filepath.Dir will always return the parent.
-		//   (because both "/foo" and "/foo/" are valid symlink destinations,
-		//   but filepath.Dir would return "/" and "/foo", respectively)
-		return filepath.Dir(filepath.Clean(dest))
+	switch runtime.GOOS {
+	case "linux", "android":
+		// Header files are typically stored in /usr/lib/clang/<version>/include.
+		// Tested on Fedora 39, Debian 12, and Arch Linux.
+		path := filepath.Join("/usr/lib/clang", llvmMajor)
+		_, err := os.Stat(filepath.Join(path, "include", "stdint.h"))
+		if err == nil {
+			return path
+		}
+	case "darwin":
+		// This assumes a Homebrew installation, like in builder/commands.go.
+		var prefix string
+		switch runtime.GOARCH {
+		case "amd64":
+			prefix = "/usr/local/opt/llvm@" + llvmMajor
+		case "arm64":
+			prefix = "/opt/homebrew/opt/llvm@" + llvmMajor
+		default:
+			return "" // very unlikely for now
+		}
+		path := fmt.Sprintf("%s/lib/clang/%s", prefix, llvmMajor)
+		_, err := os.Stat(path + "/include/stdint.h")
+		if err == nil {
+			return path
+		}
 	}
-	return path
+
+	// Could not find it.
+	return ""
 }
@@ -0,0 +1,7 @@
+//go:build byollvm
+
+package goenv
+
+func init() {
+	hasBuiltinTools = true
+}
@@ -4,15 +4,12 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
-	"path/filepath"
-	"regexp"
 	"strings"
 )

 // Version of TinyGo.
 // Update this value before release of new version of software.
-const Version = "0.28.0-dev"
+const version = "0.31.0-dev"

 var (
 	// This variable is set at build time using -ldflags parameters.
@@ -20,10 +17,20 @@ var (
 	GitSha1 string
 )

+// Return TinyGo version, either in the form 0.30.0 or as a development version
+// (like 0.30.0-dev-abcd012).
+func Version() string {
+	v := version
+	if strings.HasSuffix(version, "-dev") && GitSha1 != "" {
+		v += "-" + GitSha1
+	}
+	return v
+}
+
 // GetGorootVersion returns the major and minor version for a given GOROOT path.
 // If the goroot cannot be determined, (0, 0) is returned.
-func GetGorootVersion(goroot string) (major, minor int, err error) {
-	s, err := GorootVersionString(goroot)
+func GetGorootVersion() (major, minor int, err error) {
+	s, err := GorootVersionString()
 	if err != nil {
 		return 0, 0, err
 	}
@@ -51,24 +58,9 @@ func GetGorootVersion(goroot string) (major, minor int, err error) {
 }

 // GorootVersionString returns the version string as reported by the Go
-// toolchain for the given GOROOT path. It is usually of the form `go1.x.y` but
-// can have some variations (for beta releases, for example).
-func GorootVersionString(goroot string) (string, error) {
-	if data, err := os.ReadFile(filepath.Join(goroot, "VERSION")); err == nil {
-		return string(data), nil
-
-	} else if data, err := os.ReadFile(filepath.Join(
-		goroot, "src", "internal", "buildcfg", "zbootstrap.go")); err == nil {
-
-		r := regexp.MustCompile("const version = `(.*)`")
-		matches := r.FindSubmatch(data)
-		if len(matches) != 2 {
-			return "", errors.New("Invalid go version output:\n" + string(data))
-		}
-
-		return string(matches[1]), nil
-
-	} else {
-		return "", err
-	}
+// toolchain. It is usually of the form `go1.x.y` but can have some variations
+// (for beta releases, for example).
+func GorootVersionString() (string, error) {
+	err := readGoEnvVars()
+	return goEnvVars.GOVERSION, err
 }
@@ -1,4 +1,4 @@
 #!/bin/bash
 # Docker hub does a recursive clone, then checks the branch out,
 # so when a PR adds a submodule (or updates it), it fails.
-git submodule update --init
+git submodule update --init --recursive
@@ -49,7 +49,10 @@ func (inst *instruction) String() string {
 		operands[i] = op.String()
 	}

-	name := instructionNameMap[inst.opcode]
+	name := ""
+	if int(inst.opcode) < len(instructionNameMap) {
+		name = instructionNameMap[inst.opcode]
+	}
 	if name == "" {
 		name = "<unknown op>"
 	}
@@ -35,14 +35,14 @@ func isRecoverableError(err error) bool {
 // ErrorLine is one line in a traceback. The position may be missing.
 type ErrorLine struct {
 	Pos  token.Position
-	Inst llvm.Value
+	Inst string
 }

 // Error encapsulates compile-time interpretation errors with an associated
 // import path. The errors may not have a precise location attached.
 type Error struct {
 	ImportPath string
-	Inst       llvm.Value
+	Inst       string
 	Pos        token.Position
 	Err        error
 	Traceback  []ErrorLine
@@ -60,10 +60,10 @@ func (r *runner) errorAt(inst instruction, err error) *Error {
 	pos := getPosition(inst.llvmInst)
 	return &Error{
 		ImportPath: r.pkgName,
-		Inst:       inst.llvmInst,
+		Inst:       inst.llvmInst.String(),
 		Pos:        pos,
 		Err:        err,
-		Traceback:  []ErrorLine{{pos, inst.llvmInst}},
+		Traceback:  []ErrorLine{{pos, inst.llvmInst.String()}},
 	}
 }

@@ -21,7 +21,7 @@ type runner struct {
 	targetData    llvm.TargetData
 	builder       llvm.Builder
 	pointerSize   uint32                   // cached pointer size from the TargetData
-	i8ptrType     llvm.Type                // often used type so created in advance
+	dataPtrType   llvm.Type                // often used type so created in advance
 	uintptrType   llvm.Type                // equivalent to uintptr in Go
 	maxAlign      int                      // maximum alignment of an object, alignment of runtime.alloc() result
 	debug         bool                     // log debug messages
@@ -46,9 +46,9 @@ func newRunner(mod llvm.Module, timeout time.Duration, debug bool) *runner {
 		timeout:       timeout,
 	}
 	r.pointerSize = uint32(r.targetData.PointerSize())
-	r.i8ptrType = llvm.PointerType(mod.Context().Int8Type(), 0)
+	r.dataPtrType = llvm.PointerType(mod.Context().Int8Type(), 0)
 	r.uintptrType = mod.Context().IntType(r.targetData.PointerSize() * 8)
-	r.maxAlign = r.targetData.PrefTypeAlignment(r.i8ptrType) // assume pointers are maximally aligned (this is not always the case)
+	r.maxAlign = r.targetData.PrefTypeAlignment(r.dataPtrType) // assume pointers are maximally aligned (this is not always the case)
 	return &r
 }

@@ -126,7 +126,7 @@ func Run(mod llvm.Module, timeout time.Duration, debug bool) error {
 				mem.revert()
 				// Create a call to the package initializer (which was
 				// previously deleted).
-				i8undef := llvm.Undef(r.i8ptrType)
+				i8undef := llvm.Undef(r.dataPtrType)
 				r.builder.CreateCall(fn.GlobalValueType(), fn, []llvm.Value{i8undef}, "")
 				// Make sure that any globals touched by the package
 				// initializer, won't be accessed by later package initializers.
@@ -174,8 +174,7 @@ func Run(mod llvm.Module, timeout time.Duration, debug bool) error {
 			newGlobal.SetLinkage(obj.llvmGlobal.Linkage())
 			newGlobal.SetAlignment(obj.llvmGlobal.Alignment())
 			// TODO: copy debug info, unnamed_addr, ...
-			bitcast := llvm.ConstBitCast(newGlobal, obj.llvmGlobal.Type())
-			obj.llvmGlobal.ReplaceAllUsesWith(bitcast)
+			obj.llvmGlobal.ReplaceAllUsesWith(newGlobal)
 			name := obj.llvmGlobal.Name()
 			obj.llvmGlobal.EraseFromParentAsGlobal()
 			newGlobal.SetName(name)
--- a/Show More
+++ b/Show More