interp: do not rely on fixed type names

After merging multiple LLVM modules into one, types may have been renamed. Therefore, the interp package should not rely on types to have any particular name.
compiler: include type information about the runtime in the compiler
2026-07-27 07:08:42 +00:00 · 2020-05-03 15:43:45 +02:00 · 2020-05-03 15:43:45 +02:00 · 2020-05-03 15:43:45 +02:00 · 2020-05-03 15:43:45 +02:00 · 2020-05-03 15:43:44 +02:00
469 changed files with 4574 additions and 23410 deletions
@@ -28,7 +28,6 @@ commands:
                qemu-user \
                gcc-avr \
                avr-libc
-            sudo apt-get install --no-install-recommends libc6-dev-i386 lib32gcc-8-dev
  install-node:
    steps:
      - run:
@@ -38,54 +37,28 @@ commands:
            sudo tar -C /usr/local -xf node-v10.15.1-linux-x64.tar.xz
            sudo ln -s /usr/local/node-v10.15.1-linux-x64/bin/node /usr/bin/node
            rm node-v10.15.1-linux-x64.tar.xz
-  install-chrome:
-    steps:
-      - run:
-          name: "Install Chrome"
-          command: |
-            wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
-            sudo apt install ./google-chrome-stable_current_amd64.deb
-  install-wasmtime:
-    steps:
-      - run:
-          name: "Install wasmtime"
-          command: |
-            curl https://wasmtime.dev/install.sh -sSf | bash
-            sudo ln -s ~/.wasmtime/bin/wasmtime /usr/local/bin/wasmtime
-  install-xtensa-toolchain:
-    parameters:
-      variant:
-        type: string
-    steps:
-      - run:
-          name: "Install Xtensa toolchain"
-          command: |
-            curl -L https://github.com/espressif/crosstool-NG/releases/download/esp-2020r2/xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz -o xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz
-            sudo tar -C /usr/local -xf xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz
-            sudo ln -s /usr/local/xtensa-esp32-elf/bin/xtensa-esp32-elf-ld /usr/local/bin/xtensa-esp32-elf-ld
-            rm xtensa-esp32-elf-gcc8_2_0-esp-2020r2-<<parameters.variant>>.tar.gz
  llvm-source-linux:
    steps:
      - restore_cache:
          keys:
-            - llvm-source-10-v1
+            - llvm-source-10-v0
      - run:
          name: "Fetch LLVM source"
          command: make llvm-source
      - save_cache:
-          key: llvm-source-10-v1
+          key: llvm-source-10-v0
          paths:
            - llvm-project
  build-wasi-libc:
    steps:
      - restore_cache:
          keys:
-            - wasi-libc-sysroot-v3
+            - wasi-libc-sysroot-v2
      - run:
          name: "Build wasi-libc"
          command: make wasi-libc
      - save_cache:
-          key: wasi-libc-sysroot-v3
+          key: wasi-libc-sysroot-v2
          paths:
            - lib/wasi-libc/sysroot
  test-linux:
@@ -98,8 +71,6 @@ commands:
      - apt-dependencies:
          llvm: "<<parameters.llvm>>"
      - install-node
-      - install-chrome
-      - install-wasmtime
      - restore_cache:
          keys:
            - go-cache-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
@@ -108,21 +79,20 @@ commands:
      - run: go install -tags=llvm<<parameters.llvm>> .
      - restore_cache:
          keys:
-            - wasi-libc-sysroot-systemclang-v2
+            - wasi-libc-sysroot-systemclang-v1
      - run: make wasi-libc
      - save_cache:
-          key: wasi-libc-sysroot-systemclang-v2
+          key: wasi-libc-sysroot-systemclang-v1
          paths:
            - lib/wasi-libc/sysroot
-      - run: go test -v -tags=llvm<<parameters.llvm>> ./cgo ./compileopts ./interp ./transform .
+      - run: go test -v -tags=llvm<<parameters.llvm>> ./cgo ./compileopts ./compiler ./interp ./transform .
      - run: make gen-device -j4
-      - run: make smoketest XTENSA=0
-      - run: make tinygo-test
-      - run: make wasmtest
+      - run: make smoketest
      - save_cache:
          key: go-cache-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
          paths:
            - ~/.cache/go-build
+            - ~/.cache/tinygo
            - /go/pkg/mod
      - run: make fmt-check
  assert-test-linux:
@@ -134,6 +104,7 @@ commands:
          command: |
            sudo apt-get install \
                gcc-arm-linux-gnueabihf \
+                binutils-arm-none-eabi \
                libc6-dev-armel-cross \
                gcc-aarch64-linux-gnu \
                libc6-dev-arm64-cross \
@@ -141,11 +112,7 @@ commands:
                qemu-user \
                gcc-avr \
                avr-libc
-            sudo apt-get install --no-install-recommends libc6-dev-i386 lib32gcc-6-dev
      - install-node
-      - install-wasmtime
-      - install-xtensa-toolchain:
-          variant: "linux-amd64"
      - restore_cache:
          keys:
            - go-cache-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
@@ -153,7 +120,7 @@ commands:
      - llvm-source-linux
      - restore_cache:
          keys:
-            - llvm-build-10-linux-v1-assert
+            - llvm-build-10-linux-v0-assert
      - run:
          name: "Build LLVM"
          command: |
@@ -171,7 +138,7 @@ commands:
              make ASSERT=1 llvm-build
            fi
      - save_cache:
-          key: llvm-build-10-linux-v1-assert
+          key: llvm-build-10-linux-v0-assert
          paths:
            llvm-build
      - run: make ASSERT=1
@@ -183,6 +150,7 @@ commands:
          key: go-cache-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
          paths:
            - ~/.cache/go-build
+            - ~/.cache/tinygo
            - /go/pkg/mod
      - run: make gen-device -j4
      - run: make smoketest TINYGO=build/tinygo
@@ -195,6 +163,7 @@ commands:
          command: |
            sudo apt-get install \
                gcc-arm-linux-gnueabihf \
+                binutils-arm-none-eabi \
                libc6-dev-armel-cross \
                gcc-aarch64-linux-gnu \
                libc6-dev-arm64-cross \
@@ -202,11 +171,7 @@ commands:
                qemu-user \
                gcc-avr \
                avr-libc
-            sudo apt-get install --no-install-recommends libc6-dev-i386 lib32gcc-6-dev
      - install-node
-      - install-wasmtime
-      - install-xtensa-toolchain:
-          variant: "linux-amd64"
      - restore_cache:
          keys:
            - go-cache-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
@@ -214,7 +179,7 @@ commands:
      - llvm-source-linux
      - restore_cache:
          keys:
-            - llvm-build-10-linux-v1
+            - llvm-build-10-linux-v0
      - run:
          name: "Build LLVM"
          command: |
@@ -232,32 +197,25 @@ commands:
              make llvm-build
            fi
      - save_cache:
-          key: llvm-build-10-linux-v1
+          key: llvm-build-10-linux-v0
          paths:
            llvm-build
      - build-wasi-libc
      - run:
          name: "Test TinyGo"
          command: make test
-      - run:
-          name: "Install fpm"
-          command: |
-            sudo apt-get install ruby ruby-dev
-            sudo gem install --no-document fpm
      - run:
          name: "Build TinyGo release"
          command: |
-            make release deb -j3
+            make release -j3
            cp -p build/release.tar.gz /tmp/tinygo.linux-amd64.tar.gz
-            cp -p build/release.deb    /tmp/tinygo_amd64.deb
      - store_artifacts:
          path: /tmp/tinygo.linux-amd64.tar.gz
-      - store_artifacts:
-          path: /tmp/tinygo_amd64.deb
      - save_cache:
          key: go-cache-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
          paths:
            - ~/.cache/go-build
+            - ~/.cache/tinygo
            - /go/pkg/mod
      - run:
          name: "Extract release tarball"
@@ -278,25 +236,23 @@ commands:
            sudo tar -C /usr/local -xzf go1.14.darwin-amd64.tar.gz
            ln -s /usr/local/go/bin/go /usr/local/bin/go
            HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu
-      - install-xtensa-toolchain:
-          variant: "macos"
      - restore_cache:
          keys:
            - go-cache-macos-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_PREVIOUS_BUILD_NUM }}
            - go-cache-macos-v2-{{ checksum "go.mod" }}
      - restore_cache:
          keys:
-            - llvm-source-10-macos-v1
+            - llvm-source-10-macos-v0
      - run:
          name: "Fetch LLVM source"
          command: make llvm-source
      - save_cache:
-          key: llvm-source-10-macos-v1
+          key: llvm-source-10-macos-v0
          paths:
            - llvm-project
      - restore_cache:
          keys:
-            - llvm-build-10-macos-v1
+            - llvm-build-10-macos-v0
      - run:
          name: "Build LLVM"
          command: |
@@ -308,17 +264,17 @@ commands:
              make llvm-build
            fi
      - save_cache:
-          key: llvm-build-10-macos-v1
+          key: llvm-build-10-macos-v0
          paths:
            llvm-build
      - restore_cache:
          keys:
-            - wasi-libc-sysroot-macos-v2
+            - wasi-libc-sysroot-macos-v1
      - run:
          name: "Build wasi-libc"
          command: make wasi-libc
      - save_cache:
-          key: wasi-libc-sysroot-macos-v2
+          key: wasi-libc-sysroot-macos-v1
          paths:
            - lib/wasi-libc/sysroot
      - run:
@@ -338,66 +294,19 @@ commands:
            tar -C /usr/local/opt -xf /tmp/tinygo.darwin-amd64.tar.gz
            ln -s /usr/local/opt/tinygo/bin/tinygo /usr/local/bin/tinygo
            tinygo version
+      - run:
+          name: "Download SiFive GNU toolchain"
+          command: |
+            curl -O https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.2.0-2019.05.3-x86_64-apple-darwin.tar.gz
+            sudo tar -C /usr/local --strip-components=1 -xf riscv64-unknown-elf-gcc-8.2.0-2019.05.3-x86_64-apple-darwin.tar.gz
      - run: make smoketest AVR=0
      - save_cache:
          key: go-cache-macos-v2-{{ checksum "go.mod" }}-{{ .Environment.CIRCLE_BUILD_NUM }}
          paths:
            - ~/.cache/go-build
+            - ~/.cache/tinygo
            - /go/pkg/mod
-  arch-release:
-    steps:
-      - run:
-          name: Install dependencies
-          command: pacman -Sy --noconfirm openssh git pacman-contrib binutils
-      - run:
-          name: Create TinyGo user
-          command: useradd -m tinygo
-      - run:
-          name: Start SSH Agent
-          user: tinygo
-          command: eval $(ssh-agent -s)
-      - run:
-          name: Add ARCH_RELEASE_SSH_PRIVATE_KEY identity
-          user: tinygo
-          command: echo "${ARCH_RELEASE_SSH_PRIVATE_KEY}" | tr -d '\r' | ssh-add -
-      - run:
-          name: Create SSH directory
-          user: tinygo
-          command: mkdir -p ~/.ssh && chmod 700 ~/.ssh
-      - run:
-          name: Add aur.archlinux.org to known hosts
-          user: tinygo
-          command: ssh-keyscan aur.archlinux.org >> ~/.ssh/known_hosts
-      - run:
-          name: Clone tinygo-bin repo
-          user: tinygo
-          command: git clone ssh://aur@aur.archlinux.org/tinygo-bin.git ~/tinygo-bin
-      - run:
-          name: Update package version
-          user: tinygo
-          command: sed -i -E "s/(pkgver=)(.*)$/\1${CIRCLE_TAG}/" ~/tinygo-bin/PKGBUILD
-      - run:
-          name: Update file checksums
-          user: tinygo
-          command: cd ~/tinygo-bin && updpkgsums
-      - run:
-          name: Update .SRCINFO
-          user: tinygo
-          command: cd ~/tinygo-bin && makepkg --printsrcinfo > .SRCINFO
-      # Commit the update
-      - run:
-          name: Set git commit config
-          user: tinygo
-          command: |
-            git config --global user.email "tinygo-bot@tinygo.org" &&
-            git config --global user.name "TinyGo Release Bot"
-      - run:
-          name: Commit and push changes
-          user: tinygo
-          command: |
-            cd ~/tinygo-bin &&
-            git commit -a -m "Update tinygo-bin to v${CIRCLE_TAG}" &&
-            git push origin master
+

 jobs:
  test-llvm9-go111:
@@ -424,12 +333,6 @@ jobs:
    steps:
      - test-linux:
          llvm: "10"
-  test-llvm11-go115:
-    docker:
-      - image: circleci/golang:1.15-buster
-    steps:
-      - test-linux:
-          llvm: "11"
  assert-test-linux:
    docker:
      - image: circleci/golang:1.14-stretch
@@ -445,11 +348,6 @@ jobs:
      xcode: "10.1.0"
    steps:
      - build-macos
-  arch-release:
-    docker:
-      - image: archlinux:latest
-    steps:
-      - arch-release



@@ -461,16 +359,6 @@ workflows:
      - test-llvm10-go112
      - test-llvm10-go113
      - test-llvm10-go114
-      - test-llvm11-go115
      - build-linux
      - build-macos
      - assert-test-linux
-  release:
-    jobs:
-      - arch-release:
-          filters:
-            branches:
-              ignore: /.*/
-            tags:
-              # Runs on every semver release
-              only: /v[0-9]+(\.[0-9]+)*(-.*)*/
@@ -3,19 +3,14 @@ docs/_build
 src/device/avr/*.go
 src/device/avr/*.ld
 src/device/avr/*.s
-src/device/esp/*.go
 src/device/nrf/*.go
 src/device/nrf/*.s
-src/device/nxp/*.go
-src/device/nxp/*.s
 src/device/sam/*.go
 src/device/sam/*.s
 src/device/sifive/*.go
 src/device/sifive/*.s
 src/device/stm32/*.go
 src/device/stm32/*.s
-src/device/kendryte/*.go
-src/device/kendryte/*.s
 vendor
 llvm-build
 llvm-project
@@ -9,7 +9,7 @@
 	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/posborne/cmsis-svd
 [submodule "lib/compiler-rt"]
 	path = lib/compiler-rt
 	url = https://github.com/llvm-mirror/compiler-rt.git
@@ -10,14 +10,6 @@ This guide describes how to statically link TinyGo against LLVM, libclang and
 lld so that the binary can be easily moved between systems. It also shows how to
 build a release tarball that includes this binary and all necessary extra files.

-**Note**: this documentation describes how to build a statically linked release
-tarball. If you want to develop TinyGo, you will probably want to follow a
-different guide:
-
-  * [Linux](https://tinygo.org/getting-started/linux/#source-install)
-  * [macOS](https://tinygo.org/getting-started/macos/#source-install)
-  * [Windows](https://tinygo.org/getting-started/windows/#source-install)
-
 ## Dependencies

 LLVM, Clang and LLD are quite light on dependencies, requiring only standard
@@ -92,10 +84,6 @@ Now that we have a working static build, it's time to make a release tarball:

    make release

-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
-
 The release tarball is stored in build/release.tar.gz, and can be extracted with
 the following command (for example in ~/lib):

@@ -1,226 +1,3 @@
-0.16.0
---
-
-* **command-line**
-  - add initial support for LLVM 11
-  - make lib64 clang include path check more robust
-  - `build`: improve support for GOARCH=386 and add tests
-  - `gdb`: add support for qemu-user targets
-  - `test`: support non-host tests
-  - `test`: add support for -c and -o flags
-  - `test`: implement some benchmark stubs
-* **compiler**
-  - `builder`: improve detection of clang on Fedora
-  - `compiler`: fix floating point comparison bugs
-  - `compiler`: implement negate for complex numbers
-  - `loader`: fix linkname in test binaries
-  - `transform`: add missing return pointer restore for regular coroutine tail
-    calls
-* **standard library**
-  - `machine`: switch default frequency to 4MHz
-  - `machine`: clarify caller's responsibility in `SetInterrupt`
-  - `os`: add `LookupEnv()` stub
-  - `reflect`: implement `Swapper`
-  - `runtime`: fix UTF-8 decoding
-  - `runtime`: gc: use raw stack access whenever possible
-  - `runtime`: use dedicated printfloat32
-  - `runtime`: allow ranging over a nil map
-  - `runtime`: avoid device/nxp dependency in HardFault handler
-  - `testing`: implement dummy Helper method
-  - `testing`: add Run method
-* **targets**
-  - `arm64`: add support for SVCall intrinsic
-  - `atsamd51`: avoid panic when configuring SPI with SDI=NoPin
-  - `avr`: properly support the `.rodata` section
-  - `esp8266`: implement `Pin.Get` function
-  - `nintendoswitch`: fix crash when printing long lines (> 120)
-  - `nintendoswitch`: add env parser and removed unused stuff
-  - `nrf`: add I2C error checking
-  - `nrf`: give more flexibility in picking SPI speeds
-  - `nrf`: fix nrf52832 flash size
-  - `stm32f103`: support wakeups from interrupts
-  - `stm32f405`: add SPI support
-  - `stm32f405`: add I2C support
-  - `wasi`: add support for this target
-  - `wasi`: use 'generic' ABI by default
-  - `wasi`: remove --no-threads flag from wasm-ld
-  - `wasm`: add instanceof support for WebAssembly
-  - `wasm`: use fixed length buffer for putchar
-* **boards**
-  - `d1mini`: add this ESP8266 based board
-  - `esp32`: use board definitions instead of chip names
-  - `qtpy`: add board definition for Adafruit QTPy
-  - `teensy40`: add this board
-
-0.15.0
---
-
-* **command-line**
-  - add cached GOROOT to info subcommand
-  - embed git-hash in tinygo-dev executable
-  - implement tinygo targets to list usable targets
-  - use simpler file copy instead of file renaming to avoid issues on nrf52840 UF2 bootloaders
-  - use ToSlash() to specify program path
-  - support flashing esp32/esp8266 directly from tinygo
-  - when flashing call PortReset only on other than openocd
-* **compiler**
-  - `compileopts`: add support for custom binary formats
-  - `compiler`: improve display of goroutine wrappers
-  - `interp`: don't panic in the Store method
-  - `interp`: replace some panics with error messages
-  - `interp`: show error line in first line of the traceback
-  - `loader`: be more robust when creating the cached GOROOT
-  - `loader`: rewrite/refactor much of the code to use go list directly
-  - `loader`: use ioutil.TempDir to create a temporary directory
-  - `stacksize`: deal with DW_CFA_advance_loc1
-* **standard library**
-  - `runtime`: use waitForEvents when appropriate
-* **wasm**
-  - `wasm`: Remove --no-threads from wasm-ld calls.
-  - `wasm`: update wasi-libc dependency
-* **targets**
-  - `arduino-mega2560`: fix flashing on Windows
-  - `arm`: automatically determine stack sizes
-  - `arm64`: make dynamic loader structs and constants private
-  - `avr`: configure emulator in board files
-  - `cortexm`: fix stack size calculation with interrupts
-  - `flash`: add openocd settings to atsamd21 / atsamd51
-  - `flash`: add openocd settings to nrf5
-  - `microbit`: reelboard: flash using OpenOCD when needed
-  - `nintendoswitch`: Add dynamic loader for runtime loading PIE sections
-  - `nintendoswitch`: fix import cycle on dynamic_arm64.go
-  - `nintendoswitch`: Fix invalid memory read / write in print calls
-  - `nintendoswitch`: simplified assembly code
-  - `nintendoswitch`: support outputting .nro files directly
-* **boards**
-  - `arduino-zero`: Adding support for the Arduino Zero (#1365)
-  - `atsamd2x`: fix BAUD value
-  - `atsamd5x`: fix BAUD value
-  - `bluepill`: Enable stm32's USART2 for the board and map it to UART1 tinygo's device
-  - `device/atsamd51x`: add all remaining bitfield values for PCHCTRLm Mapping
-  - `esp32`: add libgcc ROM functions to linker script
-  - `esp32`: add SPI support
-  - `esp32`: add support for basic GPIO
-  - `esp32`: add support for the Espressif ESP32 chip
-  - `esp32`: configure the I/O matrix for GPIO pins
-  - `esp32`: export machine.PortMask* for bitbanging implementations
-  - `esp8266`: add support for this chip
-  - `machine/atsamd51x,runtime/atsamd51x`: fixes needed for full support for all PWM pins. Also adds some useful constants to clarify peripheral clock usage
-  - `machine/itsybitsy-nrf52840`: add support for Adafruit Itsybitsy nrf52840 (#1243)
-  - `machine/stm32f4`: refactor common code and add new build tag stm32f4 (#1332)
-  - `nrf`: add SoftDevice support for the Circuit Playground Bluefruit
-  - `nrf`: call sd_app_evt_wait when the SoftDevice is enabled
-  - `nrf52840`: add build tags for SoftDevice support
-  - `nrf52840`: use higher priority for USB-CDC code
-  - `runtime/atsamd51x`: use PCHCTRL_GCLK_SERCOMX_SLOW for setting clocks on all SERCOM ports
-  - `stm32f405`: add basic UART handler
-  - `stm32f405`: add STM32F405 machine/runtime, and new board/target feather-stm32f405
-* **build**
-  - `all`: run test binaries in the correct directory
-  - `build`: Fix arch release job
-  - `ci`: run `tinygo test` for known-working packages
-  - `ci`: set git-fetch-depth to 1
-  - `docker`: fix the problem with the wasm build (#1357)
-  - `Makefile`: check whether submodules have been downloaded in some common cases
-* **docs**
-  - add ESP32, ESP8266, and Adafruit Feather STM32F405 to list of supported boards
-
-0.14.1
---
-* **command-line**
-  - support for Go 1.15
-* **compiler**
-  - loader:  work around Windows symlink limitation
-
-0.14.0
---
-* **command-line**
-  - fix `getDefaultPort()` on non-English Windows locales
-  - compileopts: improve error reporting of unsupported flags
-  - fix test subcommand
-  - use auto-retry to locate MSD for UF2 and HEX flashing
-  - fix touchSerialPortAt1200bps on Windows
-  - support package names with backslashes on Windows
-* **compiler**
-  - fix a few crashes due to named types
-  - add support for atomic operations
-  - move the channel blocked list onto the stack
-  - fix -gc=none
-  - fix named string to `[]byte` slice conversion
-  - implement func value and builtin defers
-  - add proper parameter names to runtime.initAll, to fix a panic
-  - builder: fix picolibc include path
-  - builder: use newer version of gohex
-  - builder: try to determine stack size information at compile time
-  - builder: remove -opt=0
-  - interp: fix sync/atomic.Value load/store methods
-  - loader: add Go module support
-  - transform: fix debug information in func lowering pass
-  - transform: do not special-case zero or one implementations of a method call
-  - transform: introduce check for method calls on nil interfaces
-  - transform: gc: track 0-index GEPs to fix miscompilation
-* **cgo**
-  - Add LDFlags support
-* **standard library**
-  - extend stdlib to allow import of more packages
-  - replace master/slave terminology with appropriate alternatives (MOSI->SDO
-    etc)
-  - `internal/bytealg`: reimplement bytealg in pure Go
-  - `internal/task`: fix nil panic in (*internal/task.Stack).Pop
-  - `os`: add Args and stub it with mock data
-  - `os`: implement virtual filesystem support
-  - `reflect`: add Cap and Len support for map and chan
-  - `runtime`: fix return address in scheduler on RISC-V
-  - `runtime`: avoid recursion in printuint64 function
-  - `runtime`: replace ReadRegister with AsmFull inline assembly
-  - `runtime`: fix compilation errors when using gc.extalloc
-  - `runtime`: add cap and len support for chans
-  - `runtime`: refactor time handling (improving accuracy)
-  - `runtime`: make channels work in interrupts
-  - `runtime/interrupt`: add cross-chip disable/restore interrupt support
-  - `sync`: implement `sync.Cond`
-  - `sync`: add WaitGroup
-* **targets**
-  - `arm`: allow nesting in DisableInterrupts and EnableInterrupts
-  - `arm`: make FPU configuraton consistent
-  - `arm`: do not mask fault handlers in critical sections
-  - `atmega2560`: fix pin mapping for pins D2, D5 and the L port
-  - `atsamd`: return an error when an incorrect PWM pin is used
-  - `atsamd`: add support for pin change interrupts
-  - `atsamd`: add DAC support
-  - `atsamd21`: add more ADC pins
-  - `atsamd51`: fix ROM / RAM size on atsamd51j20
-  - `atsamd51`: add more pins
-  - `atsamd51`: add more ADC pins
-  - `atsamd51`: add pin change interrupt settings
-  - `atsamd51`: extend pinPadMapping
-  - `arduino-nano33`: use (U)SB flag to ensure that device can be found when
-     not on default port
-  - `arduino-nano33`: remove (d)ebug flag to reduce console noise when flashing
-  - `avr`: use standard pin numbering
-  - `avr`: unify GPIO pin/port code
-  - `avr`: add support for PinInputPullup
-  - `avr`: work around codegen bug in LLVM 10
-  - `avr`: fix target triple
-  - `fe310`: remove extra println left in by mistake
-  - `feather-nrf52840`: add support for the Feather nRF52840
-  - `maixbit`: add board definition and dummy runtime
-  - `nintendoswitch`: Add experimental Nintendo Switch support without CRT
-  - `nrf`: expose the RAM base address
-  - `nrf`: add support for pin change interrupts
-  - `nrf`: add microbit-s110v8 target
-  - `nrf`: fix bug in SPI.Tx
-  - `nrf`: support debugging the PCA10056
-  - `pygamer`: add Adafruit PyGamer suport
-  - `riscv`: fix interrupt configuration bug
-  - `riscv`: disable linker relaxations during gp init
-  - `stm32f4disco`: add new target with ST-Link v2.1 debugger
-  - `teensy36`: add Teensy 3.6 support
-  - `wasm`: fix event handling
-  - `wasm`: add --no-demangle linker option
-  - `wioterminal`: add support for the Seeed Wio Terminal
-  - `xiao`: add support for the Seeed XIAO
-
 0.13.1
 ---
 * **standard library**
@@ -32,7 +32,7 @@ Microcontrollers have lots of peripherals (I2C, SPI, ADC, etc.) and many don't h

 ## How to use our Github repository

-The `release` branch of this repo will always have the latest released version of TinyGo. All of the active development work for the next release will take place in the `dev` branch. TinyGo will use semantic versioning and will create a tag/release for each release.
+The `master` branch of this repo will always have the latest released version of TinyGo. All of the active development work for the next release will take place in the `dev` branch. TinyGo will use semantic versioning and will create a tag/release for each release.

 Here is how to contribute back some code or documentation:

@@ -15,4 +15,4 @@ Ayke van Laethem <aykevanlaethem@gmail.com>
 Daniel Esteban <conejo@conejo.me>
 Loon, LLC.
 Ron Evans <ron@hybridgroup.com>
-Nia Weiss <niaow1234@gmail.com>
+Jaden Weiss <jaden@jadendw.dev>
@@ -1,10 +1,10 @@
-# TinyGo base stage installs the most recent Go 1.15.x, LLVM 10 and the TinyGo compiler itself.
-FROM golang:1.15 AS tinygo-base
+# TinyGo base stage installs Go 1.14, LLVM 10 and the TinyGo compiler itself.
+FROM golang:1.14 AS tinygo-base

 RUN wget -O- https://apt.llvm.org/llvm-snapshot.gpg.key| apt-key add - && \
    echo "deb http://apt.llvm.org/buster/ llvm-toolchain-buster-10 main" >> /etc/apt/sources.list && \
    apt-get update && \
-    apt-get install -y llvm-10-dev libclang-10-dev lld-10 git
+    apt-get install -y llvm-10-dev libclang-10-dev git

 COPY . /tinygo

@@ -27,10 +27,10 @@ COPY --from=tinygo-base /go/bin/tinygo /go/bin/tinygo
 COPY --from=tinygo-base /tinygo/src /tinygo/src
 COPY --from=tinygo-base /tinygo/targets /tinygo/targets

-RUN cd /tinygo/ && \
+RUN wget -O- https://apt.llvm.org/llvm-snapshot.gpg.key| apt-key add - && \
+    echo "deb http://apt.llvm.org/buster/ llvm-toolchain-buster-10 main" >> /etc/apt/sources.list && \
    apt-get update && \
-    apt-get install -y make clang-10 libllvm10 lld-10 && \
-    make wasi-libc
+    apt-get install -y libllvm10 lld-10

 # tinygo-avr stage installs the needed dependencies to compile TinyGo programs for AVR microcontrollers.
 FROM tinygo-base AS tinygo-avr
@@ -9,10 +9,25 @@ CLANG_SRC ?= $(LLVM_PROJECTDIR)/clang
 LLD_SRC ?= $(LLVM_PROJECTDIR)/lld

 # Try to autodetect LLVM build tools.
-detect = $(shell command -v $(1) 2> /dev/null && echo $(1))
-CLANG ?= $(word 1,$(abspath $(call detect,llvm-build/bin/clang))$(call detect,clang-11)$(call detect,clang-10)$(call detect,clang))
-LLVM_AR ?= $(word 1,$(abspath $(call detect,llvm-build/bin/llvm-ar))$(call detect,llvm-ar-11)$(call detect,llvm-ar-10)$(call detect,llvm-ar))
-LLVM_NM ?= $(word 1,$(abspath $(call detect,llvm-build/bin/llvm-nm))$(call detect,llvm-nm-11)$(call detect,llvm-nm-10)$(call detect,llvm-nm))
+ifneq (, $(shell command -v llvm-build/bin/clang 2> /dev/null))
+    CLANG ?= $(abspath llvm-build/bin/clang)
+else
+    CLANG ?= clang-10
+endif
+ifneq (, $(shell command -v llvm-build/bin/llvm-ar 2> /dev/null))
+    LLVM_AR ?= $(abspath llvm-build/bin/llvm-ar)
+else ifneq (, $(shell command -v llvm-ar-10 2> /dev/null))
+    LLVM_AR ?= llvm-ar-10
+else
+    LLVM_AR ?= llvm-ar
+endif
+ifneq (, $(shell command -v llvm-build/bin/llvm-nm 2> /dev/null))
+    LLVM_NM ?= $(abspath llvm-build/bin/llvm-nm)
+else ifneq (, $(shell command -v llvm-nm-10 2> /dev/null))
+    LLVM_NM ?= llvm-nm-10
+else
+    LLVM_NM ?= llvm-nm
+endif

 # Go binary and GOROOT to select
 GO ?= go
@@ -22,7 +37,7 @@ export GOROOT = $(shell $(GO) env GOROOT)
 MD5SUM = md5sum

 # tinygo binary for tests
-TINYGO ?= $(word 1,$(call detect,tinygo)$(call detect,build/tinygo))
+TINYGO ?= tinygo

 # Use CCACHE for LLVM if possible
 ifneq (, $(shell command -v ccache 2> /dev/null))
@@ -36,7 +51,7 @@ else
    LLVM_OPTION += '-DLLVM_ENABLE_ASSERTIONS=OFF'
 endif

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

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

@@ -89,24 +104,23 @@ LLD_LIBS = $(START_GROUP) -llldCOFF -llldCommon -llldCore -llldDriver -llldELF -
 ifneq ("$(wildcard $(LLVM_BUILDDIR)/bin/llvm-config*)","")
    CGO_CPPFLAGS=$(shell $(LLVM_BUILDDIR)/bin/llvm-config --cppflags) -I$(abspath $(LLVM_BUILDDIR))/tools/clang/include -I$(abspath $(CLANG_SRC))/include -I$(abspath $(LLD_SRC))/include
    CGO_CXXFLAGS=-std=c++14
-    CGO_LDFLAGS+=$(LIBCLANG_PATH) -L$(abspath $(LLVM_BUILDDIR)/lib) $(CLANG_LIBS) $(LLD_LIBS) $(shell $(LLVM_BUILDDIR)/bin/llvm-config --ldflags --libs --system-libs $(LLVM_COMPONENTS)) -lstdc++ $(CGO_LDFLAGS_EXTRA)
+    CGO_LDFLAGS+=$(LIBCLANG_PATH) -std=c++14 -L$(abspath $(LLVM_BUILDDIR)/lib) $(CLANG_LIBS) $(LLD_LIBS) $(shell $(LLVM_BUILDDIR)/bin/llvm-config --ldflags --libs --system-libs $(LLVM_COMPONENTS)) -lstdc++ $(CGO_LDFLAGS_EXTRA)
 endif


 clean:
 	@rm -rf build

-FMT_PATHS = ./*.go builder cgo compiler interp ir loader src/device/arm src/examples src/machine src/os src/reflect src/runtime src/sync src/syscall src/internal/reflectlite transform
+FMT_PATHS = ./*.go builder cgo compiler compiler/testdata interp loader src/device/arm src/examples src/machine src/os src/reflect src/runtime src/sync src/syscall src/internal/reflectlite transform
 fmt:
 	@gofmt -l -w $(FMT_PATHS)
 fmt-check:
 	@unformatted=$$(gofmt -l $(FMT_PATHS)); [ -z "$$unformatted" ] && exit 0; echo "Unformatted:"; for fn in $$unformatted; do echo "  $$fn"; done; exit 1


-gen-device: gen-device-avr gen-device-esp gen-device-nrf gen-device-sam gen-device-sifive gen-device-stm32 gen-device-kendryte gen-device-nxp
+gen-device: gen-device-avr gen-device-nrf gen-device-sam gen-device-sifive gen-device-stm32

 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
 	$(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/
@@ -115,18 +129,10 @@ gen-device-avr:
 build/gen-device-svd: ./tools/gen-device-svd/*.go
 	$(GO) build -o $@ ./tools/gen-device-svd/

-gen-device-esp: build/gen-device-svd
-	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/Espressif-Community -interrupts=software lib/cmsis-svd/data/Espressif-Community/ src/device/esp/
-	GO111MODULE=off $(GO) fmt ./src/device/esp
-
 gen-device-nrf: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/NordicSemiconductor/nrfx/tree/master/mdk lib/nrfx/mdk/ src/device/nrf/
 	GO111MODULE=off $(GO) fmt ./src/device/nrf

-gen-device-nxp: build/gen-device-svd
-	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/NXP lib/cmsis-svd/data/NXP/ src/device/nxp/
-	GO111MODULE=off $(GO) fmt ./src/device/nxp
-
 gen-device-sam: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/Atmel lib/cmsis-svd/data/Atmel/ src/device/sam/
 	GO111MODULE=off $(GO) fmt ./src/device/sam
@@ -135,10 +141,6 @@ gen-device-sifive: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/SiFive-Community -interrupts=software lib/cmsis-svd/data/SiFive-Community/ src/device/sifive/
 	GO111MODULE=off $(GO) fmt ./src/device/sifive

-gen-device-kendryte: build/gen-device-svd
-	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/Kendryte-Community -interrupts=software lib/cmsis-svd/data/Kendryte-Community/ src/device/kendryte/
-	GO111MODULE=off $(GO) fmt ./src/device/kendryte
-
 gen-device-stm32: build/gen-device-svd
 	./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/STMicro lib/cmsis-svd/data/STMicro/ src/device/stm32/
 	GO111MODULE=off $(GO) fmt ./src/device/stm32
@@ -146,13 +148,13 @@ gen-device-stm32: build/gen-device-svd

 # Get LLVM sources.
 $(LLVM_PROJECTDIR)/README.md:
-	git clone -b xtensa_release_10.0.1 --depth=1 https://github.com/tinygo-org/llvm-project $(LLVM_PROJECTDIR)
+	git clone -b release/10.x https://github.com/llvm/llvm-project $(LLVM_PROJECTDIR)
 llvm-source: $(LLVM_PROJECTDIR)/README.md

 # Configure LLVM.
 TINYGO_SOURCE_DIR=$(shell pwd)
 $(LLVM_BUILDDIR)/build.ninja: llvm-source
-	mkdir -p $(LLVM_BUILDDIR); cd $(LLVM_BUILDDIR); cmake -G Ninja $(TINYGO_SOURCE_DIR)/$(LLVM_PROJECTDIR)/llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;RISCV;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR;Xtensa" -DCMAKE_BUILD_TYPE=Release -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_LIBEDIT=OFF -DLLVM_ENABLE_Z3_SOLVER=OFF -DLLVM_ENABLE_OCAMLDOC=OFF -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF $(LLVM_OPTION)
+	mkdir -p $(LLVM_BUILDDIR); cd $(LLVM_BUILDDIR); cmake -G Ninja $(TINYGO_SOURCE_DIR)/$(LLVM_PROJECTDIR)/llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;RISCV;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR" -DCMAKE_BUILD_TYPE=Release -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF $(LLVM_OPTION)

 # Build LLVM.
 $(LLVM_BUILDDIR): $(LLVM_BUILDDIR)/build.ninja
@@ -163,40 +165,24 @@ $(LLVM_BUILDDIR): $(LLVM_BUILDDIR)/build.ninja
 .PHONY: wasi-libc
 wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
 lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
-	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
 	cd lib/wasi-libc && make -j4 WASM_CC=$(CLANG) WASM_AR=$(LLVM_AR) WASM_NM=$(LLVM_NM)


 # 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 $(LLVM_BUILDDIR)"; exit 1; fi
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) build -buildmode exe -o build/tinygo$(EXE) -tags byollvm -ldflags="-X main.gitSha1=`git rev-parse --short HEAD`" .
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) build -o build/tinygo$(EXE) -tags byollvm .

 test: wasi-libc
-	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test -v -buildmode exe -tags byollvm ./cgo ./compileopts ./interp ./transform .
+	CGO_CPPFLAGS="$(CGO_CPPFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) test -v -tags byollvm ./cgo ./compileopts ./compiler ./interp ./transform .

-# Test known-working standard library packages.
-# TODO: do this in one command, parallelize, and only show failing tests (no
-# implied -v flag).
-.PHONY: tinygo-test
 tinygo-test:
-	$(TINYGO) test container/heap
-	$(TINYGO) test container/list
-	$(TINYGO) test container/ring
-	$(TINYGO) test crypto/des
-	$(TINYGO) test encoding/ascii85
-	$(TINYGO) test encoding/base32
-	$(TINYGO) test encoding/hex
-	$(TINYGO) test hash/fnv
-	$(TINYGO) test hash/crc64
-	$(TINYGO) test math
-	$(TINYGO) test text/scanner
-	$(TINYGO) test unicode/utf8
+	cd tests/tinygotest && tinygo test

 .PHONY: smoketest
 smoketest:
 	$(TINYGO) version
-	# test all examples (except pwm)
+	# test all examples
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/adc
@@ -217,7 +203,7 @@ smoketest:
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=microbit            examples/microbit-blink
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/pininterrupt
+	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/pwm
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10040            examples/serial
 	@$(MD5SUM) test.hex
@@ -228,6 +214,8 @@ smoketest:
 	# test simulated boards on play.tinygo.org
 	$(TINYGO) build             -o test.wasm -tags=arduino              examples/blinky1
 	@$(MD5SUM) test.wasm
+	$(TINYGO) build             -o test.wasm -tags=hifive1-qemu         examples/serial
+	@$(MD5SUM) test.wasm
 	$(TINYGO) build             -o test.wasm -tags=hifive1b             examples/blinky1
 	@$(MD5SUM) test.wasm
 	$(TINYGO) build             -o test.wasm -tags=reelboard            examples/blinky1
@@ -243,8 +231,6 @@ smoketest:
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=microbit            examples/echo
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=microbit-s110v8     examples/echo
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=nrf52840-mdk        examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pca10031            examples/blinky1
@@ -271,15 +257,11 @@ smoketest:
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=stm32f4disco        examples/blinky2
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=stm32f4disco-1      examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=feather-stm32f405   examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-bluefruit examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=circuitplay-express examples/i2s
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=clue-alpha          examples/blinky1
+	$(TINYGO) build -size short -o test.hex -target=clue_alpha          examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.gba -target=gameboy-advance     examples/gba-display
 	@$(MD5SUM) test.gba
@@ -309,42 +291,11 @@ smoketest:
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=reelboard-s140v7    examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pygamer             examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=xiao                examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=circuitplay-express examples/dac
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pyportal            examples/dac
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=feather-nrf52840  	examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=itsybitsy-nrf52840  examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=qtpy  				examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=teensy40            examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=teensy36            examples/blinky1
-	@$(MD5SUM) test.hex
-	# test pwm
-	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m0        examples/pwm
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=itsybitsy-m4        examples/pwm
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=feather-m4          examples/pwm
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pyportal            examples/pwm
-	@$(MD5SUM) test.hex
 ifneq ($(AVR), 0)
 	$(TINYGO) build -size short -o test.hex -target=atmega1284p         examples/serial
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino             examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=arduino             examples/pwm
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino -scheduler=tasks  examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=arduino-nano        examples/blinky1
@@ -353,33 +304,13 @@ ifneq ($(AVR), 0)
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=digispark -gc=leaking examples/blinky1
 	@$(MD5SUM) test.hex
-endif
-ifneq ($(XTENSA), 0)
-	$(TINYGO) build -size short -o test.bin -target=esp32-mini32      	examples/blinky1
-	@$(MD5SUM) test.bin
-	$(TINYGO) build -size short -o test.bin -target=nodemcu             examples/blinky1
-	@$(MD5SUM) test.bin
 endif
 	$(TINYGO) build -size short -o test.hex -target=hifive1b            examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=hifive1-qemu        examples/serial
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=maixbit             examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build             -o wasm.wasm -target=wasm               examples/wasm/export
 	$(TINYGO) build             -o wasm.wasm -target=wasm               examples/wasm/main
-	# test various compiler flags
-	$(TINYGO) build -size short -o test.hex -target=pca10040 -gc=none -scheduler=none examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=pca10040 -opt=1     examples/blinky1
-	@$(MD5SUM) test.hex
-	$(TINYGO) build             -o test.nro -target=nintendoswitch      examples/serial
-	@$(MD5SUM) test.nro

-wasmtest:
-	$(GO) test ./tests/wasm
-
-build/release: tinygo gen-device wasi-libc
+release: tinygo gen-device wasi-libc
 	@mkdir -p build/release/tinygo/bin
 	@mkdir -p build/release/tinygo/lib/clang/include
 	@mkdir -p build/release/tinygo/lib/CMSIS/CMSIS
@@ -414,13 +345,4 @@ build/release: tinygo gen-device wasi-libc
 	./build/tinygo build-library -target=armv6m-none-eabi  -o build/release/tinygo/pkg/armv6m-none-eabi/picolibc.a picolibc
 	./build/tinygo build-library -target=armv7m-none-eabi  -o build/release/tinygo/pkg/armv7m-none-eabi/picolibc.a picolibc
 	./build/tinygo build-library -target=armv7em-none-eabi -o build/release/tinygo/pkg/armv7em-none-eabi/picolibc.a picolibc
-
-release: build/release
 	tar -czf build/release.tar.gz -C build/release tinygo
-
-deb: build/release
-	@mkdir -p build/release-deb/usr/local/bin
-	@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 -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
@@ -43,35 +43,27 @@ See the [getting started instructions](https://tinygo.org/getting-started/) for

 You can compile TinyGo programs for microcontrollers, WebAssembly and Linux.

-The following 44 microcontroller boards are currently supported:
+The following 32 microcontroller boards are currently supported:

 * [Adafruit Circuit Playground Bluefruit](https://www.adafruit.com/product/4333)
 * [Adafruit Circuit Playground Express](https://www.adafruit.com/product/3333)
 * [Adafruit CLUE Alpha](https://www.adafruit.com/product/4500)
 * [Adafruit Feather M0](https://www.adafruit.com/product/2772)
 * [Adafruit Feather M4](https://www.adafruit.com/product/3857)
-* [Adafruit Feather nRF52840 Express](https://www.adafruit.com/product/4062)
-* [Adafruit Feather STM32F405 Express](https://www.adafruit.com/product/4382)
 * [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 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 Trinket M0](https://www.adafruit.com/product/3500)
 * [Arduino Mega 2560](https://store.arduino.cc/arduino-mega-2560-rev3)
 * [Arduino Nano](https://store.arduino.cc/arduino-nano)
 * [Arduino Nano33 IoT](https://store.arduino.cc/nano-33-iot)
 * [Arduino Uno](https://store.arduino.cc/arduino-uno-rev3)
-* [Arduino Zero](https://store.arduino.cc/usa/arduino-zero)
 * [BBC micro:bit](https://microbit.org/)
 * [Digispark](http://digistump.com/products/1)
-* [ESP32](https://www.espressif.com/en/products/socs/esp32)
-* [ESP8266](https://www.espressif.com/en/products/socs/esp8266)
 * [Game Boy Advance](https://en.wikipedia.org/wiki/Game_Boy_Advance)
 * [Makerdiary nRF52840-MDK](https://wiki.makerdiary.com/nrf52840-mdk/)
-* [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)
@@ -80,10 +72,6 @@ The following 44 microcontroller boards are currently supported:
 * [Particle Xenon](https://docs.particle.io/datasheets/discontinued/xenon-datasheet/)
 * [Phytec reel board](https://www.phytec.eu/product-eu/internet-of-things/reelboard/)
 * [PineTime DevKit](https://www.pine64.org/pinetime/)
-* [PJRC Teensy 3.6](https://www.pjrc.com/store/teensy36.html)
-* [Seeed Wio Terminal](https://www.seeedstudio.com/Wio-Terminal-p-4509.html)
-* [Seeed Seeeduino XIAO](https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html)
-* [Seeed Sipeed MAix BiT](https://www.seeedstudio.com/Sipeed-MAix-BiT-for-RISC-V-AI-IoT-p-2872.html)
 * [SiFIve HiFive1](https://www.sifive.com/boards/hifive1)
 * [ST Micro "Nucleo F103RB"](https://www.st.com/en/evaluation-tools/nucleo-f103rb.html)
 * [ST Micro STM32F103XX "Bluepill"](http://wiki.stm32duino.com/index.php?title=Blue_Pill)
@@ -149,5 +137,3 @@ The original reasoning was: if [Python](https://micropython.org/) can run on mic
 This project is licensed under the BSD 3-clause license, just like the [Go project](https://golang.org/LICENSE) itself.

 Some code has been copied from the LLVM project and is therefore licensed under [a variant of the Apache 2.0 license](http://releases.llvm.org/10.0.0/LICENSE.TXT). This has been clearly indicated in the header of these files.
-
-Some code has been copied and/or ported from Paul Stoffregen's Teensy libraries and is therefore licensed under PJRC's license. This has been clearly indicated in the header of these files.
@@ -1,7 +1,7 @@
 # Avoid lengthy LLVM rebuilds on each newly pushed branch. Pull requests will
 # be built anyway.
 trigger:
- release
+- master
 - dev

 jobs:
@@ -12,27 +12,22 @@ jobs:
  steps:
    - task: GoTool@0
      inputs:
-        version: '1.15'
+        version: '1.14.1'
    - checkout: self
-      fetchDepth: 1
-    - task: Cache@2
+    - task: CacheBeta@0
      displayName: Cache LLVM source
      inputs:
-        key: llvm-source-10-windows-v1
+        key: llvm-source-10-windows-v0
        path: llvm-project
    - task: Bash@3
      displayName: Download LLVM source
      inputs:
        targetType: inline
-        script: |
-          make llvm-source
-          # Workaround for bad symlinks:
-          # https://github.com/microsoft/azure-pipelines-tasks/issues/13418
-          rm -f llvm-project/libcxx/test/std/input.output/filesystems/Inputs/static_test_env/bad_symlink
+        script: make llvm-source
    - task: CacheBeta@0
      displayName: Cache LLVM build
      inputs:
-        key: llvm-build-10-windows-v1
+        key: llvm-build-10-windows-v0
        path: llvm-build
    - task: Bash@3
      displayName: Build LLVM
@@ -48,11 +43,11 @@ jobs:
      displayName: Install QEMU
      inputs:
        targetType: inline
-        script: choco install qemu --version=2020.06.12
+        script: choco install qemu
    - task: CacheBeta@0
      displayName: Cache wasi-libc sysroot
      inputs:
-        key: wasi-libc-sysroot-v3
+        key: wasi-libc-sysroot-v2
        path: lib/wasi-libc/sysroot
    - task: Bash@3
      displayName: Build wasi-libc
@@ -74,7 +69,7 @@ jobs:
        script: |
          export PATH="$PATH:./llvm-build/bin:/c/Program Files/qemu"
          unset GOROOT
-          make build/release -j4
+          make release -j4
    - publish: $(System.DefaultWorkingDirectory)/build/release/tinygo
      displayName: Publish zip as artifact
      artifact: tinygo
@@ -85,4 +80,4 @@ jobs:
        script: |
          export PATH="$PATH:./llvm-build/bin:/c/Program Files/qemu"
          unset GOROOT
-          make smoketest TINYGO=build/tinygo AVR=0 XTENSA=0
+          make smoketest TINYGO=build/tinygo AVR=0
@@ -4,14 +4,11 @@
 package builder

 import (
-	"debug/elf"
-	"encoding/binary"
 	"errors"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"sort"
 	"strconv"
 	"strings"

@@ -19,40 +16,26 @@ import (
 	"github.com/tinygo-org/tinygo/compiler"
 	"github.com/tinygo-org/tinygo/goenv"
 	"github.com/tinygo-org/tinygo/interp"
-	"github.com/tinygo-org/tinygo/stacksize"
 	"github.com/tinygo-org/tinygo/transform"
 	"tinygo.org/x/go-llvm"
 )

-// BuildResult is the output of a build. This includes the binary itself and
-// some other metadata that is obtained while building the binary.
-type BuildResult struct {
-	// A path to the output binary. It will be removed after Build returns, so
-	// if it should be kept it must be copied or moved away.
-	Binary string
-
-	// The directory of the main package. This is useful for testing as the test
-	// binary must be run in the directory of the tested package.
-	MainDir string
-}
-
 // Build performs a single package to executable Go build. It takes in a package
 // name, an output path, and set of compile options and from that it manages the
 // whole compilation process.
 //
 // The error value may be of type *MultiError. Callers will likely want to check
 // for this case and print such errors individually.
-func Build(pkgName, outpath string, config *compileopts.Config, action func(BuildResult) error) error {
+func Build(pkgName, outpath string, config *compileopts.Config, action func(string) error) error {
 	// Compile Go code to IR.
 	machine, err := compiler.NewTargetMachine(config)
 	if err != nil {
 		return err
 	}
-	buildOutput, errs := compiler.Compile(pkgName, machine, config)
+	mod, extraFiles, errs := compiler.Compile(pkgName, machine, config)
 	if errs != nil {
 		return newMultiError(errs)
 	}
-	mod := buildOutput.Mod

 	if config.Options.PrintIR {
 		fmt.Println("; Generated LLVM IR:")
@@ -79,7 +62,7 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 	// keep functions interoperable, pass int64 types as pointers to
 	// stack-allocated values.
 	// Use -wasm-abi=generic to disable this behaviour.
-	if config.WasmAbi() == "js" {
+	if config.Options.WasmAbi == "js" && strings.HasPrefix(config.Triple(), "wasm") {
 		err := transform.ExternalInt64AsPtr(mod)
 		if err != nil {
 			return err
@@ -90,15 +73,8 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 	// exactly.
 	errs = nil
 	switch config.Options.Opt {
-	/*
-		Currently, turning optimizations off causes compile failures.
-		We rely on the optimizer removing some dead symbols.
-		Avoid providing an option that does not work right now.
-		In the future once everything has been fixed we can re-enable this.
-
-		case "none", "0":
-			errs = transform.Optimize(mod, config, 0, 0, 0) // -O0
-	*/
+	case "none", "0":
+		errs = transform.Optimize(mod, config, 0, 0, 0) // -O0
 	case "1":
 		errs = transform.Optimize(mod, config, 1, 0, 0) // -O1
 	case "2":
@@ -117,22 +93,16 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 		return errors.New("verification failure after LLVM optimization passes")
 	}

-	// LLVM 11 by default tries to emit tail calls (even with the target feature
-	// disabled) unless it is explicitly disabled with a function attribute.
-	// This is a problem, as it tries to emit them and prints an error when it
-	// can't with this feature disabled.
-	// Because as of september 2020 tail calls are not yet widely supported,
-	// they need to be disabled until they are widely supported (at which point
-	// the +tail-call target feautre can be set).
-	if strings.HasPrefix(config.Triple(), "wasm") {
-		transform.DisableTailCalls(mod)
-	}
-
-	// Make sure stack sizes are loaded from a separate section so they can be
-	// modified after linking.
-	var stackSizeLoads []string
-	if config.AutomaticStackSize() {
-		stackSizeLoads = transform.CreateStackSizeLoads(mod, config)
+	// On the AVR, pointers can point either to flash or to RAM, but we don't
+	// know. As a temporary fix, load all global variables in RAM.
+	// In the future, there should be a compiler pass that determines which
+	// pointers are flash and which are in RAM so that pointers can have a
+	// correct address space parameter (address space 1 is for flash).
+	if strings.HasPrefix(config.Triple(), "avr") {
+		transform.NonConstGlobals(mod)
+		if err := llvm.VerifyModule(mod, llvm.PrintMessageAction); err != nil {
+			return errors.New("verification error after making all globals non-constant on AVR")
+		}
 	}

 	// Generate output.
@@ -208,7 +178,7 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 		}

 		// Compile C files in packages.
-		for i, file := range buildOutput.ExtraFiles {
+		for i, file := range extraFiles {
 			outpath := filepath.Join(dir, "pkg"+strconv.Itoa(i)+"-"+filepath.Base(file)+".o")
 			err := runCCompiler(config.Target.Compiler, append(config.CFlags(), "-c", "-o", outpath, file)...)
 			if err != nil {
@@ -217,36 +187,12 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 			ldflags = append(ldflags, outpath)
 		}

-		if len(buildOutput.ExtraLDFlags) > 0 {
-			ldflags = append(ldflags, buildOutput.ExtraLDFlags...)
-		}
-
 		// Link the object files together.
 		err = link(config.Target.Linker, ldflags...)
 		if err != nil {
 			return &commandError{"failed to link", executable, err}
 		}

-		var calculatedStacks []string
-		var stackSizes map[string]functionStackSize
-		if config.Options.PrintStacks || config.AutomaticStackSize() {
-			// Try to determine stack sizes at compile time.
-			// Don't do this by default as it usually doesn't work on
-			// unsupported architectures.
-			calculatedStacks, stackSizes, err = determineStackSizes(mod, executable)
-			if err != nil {
-				return err
-			}
-		}
-		if config.AutomaticStackSize() {
-			// Modify the .tinygo_stacksizes section that contains a stack size
-			// for each goroutine.
-			err = modifyStackSizes(executable, stackSizeLoads, stackSizes)
-			if err != nil {
-				return fmt.Errorf("could not modify stack sizes: %w", err)
-			}
-		}
-
 		if config.Options.PrintSizes == "short" || config.Options.PrintSizes == "full" {
 			sizes, err := loadProgramSize(executable)
 			if err != nil {
@@ -266,278 +212,21 @@ func Build(pkgName, outpath string, config *compileopts.Config, action func(Buil
 			}
 		}

-		// Print goroutine stack sizes, as far as possible.
-		if config.Options.PrintStacks {
-			printStacks(calculatedStacks, stackSizes)
-		}
-
 		// Get an Intel .hex file or .bin file from the .elf file.
-		outputBinaryFormat := config.BinaryFormat(outext)
-		switch outputBinaryFormat {
-		case "elf":
-			// do nothing, file is already in ELF format
-		case "hex", "bin":
-			// Extract raw binary, either encoding it as a hex file or as a raw
-			// firmware file.
+		if outext == ".hex" || outext == ".bin" || outext == ".gba" {
 			tmppath = filepath.Join(dir, "main"+outext)
-			err := objcopy(executable, tmppath, outputBinaryFormat)
+			err := objcopy(executable, tmppath)
 			if err != nil {
 				return err
 			}
-		case "uf2":
+		} else if outext == ".uf2" {
 			// Get UF2 from the .elf file.
 			tmppath = filepath.Join(dir, "main"+outext)
 			err := convertELFFileToUF2File(executable, tmppath, config.Target.UF2FamilyID)
 			if err != nil {
 				return err
 			}
-		case "esp32", "esp8266":
-			// Special format for the ESP family of chips (parsed by the ROM
-			// bootloader).
-			tmppath = filepath.Join(dir, "main"+outext)
-			err := makeESPFirmareImage(executable, tmppath, outputBinaryFormat)
-			if err != nil {
-				return err
-			}
-		default:
-			return fmt.Errorf("unknown output binary format: %s", outputBinaryFormat)
-		}
-		return action(BuildResult{
-			Binary:  tmppath,
-			MainDir: buildOutput.MainDir,
-		})
-	}
-}
-
-// functionStackSizes keeps stack size information about a single function
-// (usually a goroutine).
-type functionStackSize struct {
-	humanName        string
-	stackSize        uint64
-	stackSizeType    stacksize.SizeType
-	missingStackSize *stacksize.CallNode
-}
-
-// determineStackSizes tries to determine the stack sizes of all started
-// goroutines and of the reset vector. The LLVM module is necessary to find
-// functions that call a function pointer.
-func determineStackSizes(mod llvm.Module, executable string) ([]string, map[string]functionStackSize, error) {
-	var callsIndirectFunction []string
-	gowrappers := []string{}
-	gowrapperNames := make(map[string]string)
-	for fn := mod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
-		// Determine which functions call a function pointer.
-		for bb := fn.FirstBasicBlock(); !bb.IsNil(); bb = llvm.NextBasicBlock(bb) {
-			for inst := bb.FirstInstruction(); !inst.IsNil(); inst = llvm.NextInstruction(inst) {
-				if inst.IsACallInst().IsNil() {
-					continue
-				}
-				if callee := inst.CalledValue(); callee.IsAFunction().IsNil() && callee.IsAInlineAsm().IsNil() {
-					callsIndirectFunction = append(callsIndirectFunction, fn.Name())
-				}
-			}
-		}
-
-		// Get a list of "go wrappers", small wrapper functions that decode
-		// parameters when starting a new goroutine.
-		attr := fn.GetStringAttributeAtIndex(-1, "tinygo-gowrapper")
-		if !attr.IsNil() {
-			gowrappers = append(gowrappers, fn.Name())
-			gowrapperNames[fn.Name()] = attr.GetStringValue()
-		}
-	}
-	sort.Strings(gowrappers)
-
-	// Load the ELF binary.
-	f, err := elf.Open(executable)
-	if err != nil {
-		return nil, nil, fmt.Errorf("could not load executable for stack size analysis: %w", err)
-	}
-	defer f.Close()
-
-	// Determine the frame size of each function (if available) and the callgraph.
-	functions, err := stacksize.CallGraph(f, callsIndirectFunction)
-	if err != nil {
-		return nil, nil, fmt.Errorf("could not parse executable for stack size analysis: %w", err)
-	}
-
-	// Goroutines need to be started and finished and take up some stack space
-	// that way. This can be measured by measuing the stack size of
-	// tinygo_startTask.
-	if numFuncs := len(functions["tinygo_startTask"]); numFuncs != 1 {
-		return nil, nil, fmt.Errorf("expected exactly one definition of tinygo_startTask, got %d", numFuncs)
-	}
-	baseStackSize, baseStackSizeType, baseStackSizeFailedAt := functions["tinygo_startTask"][0].StackSize()
-
-	sizes := make(map[string]functionStackSize)
-
-	// Add the reset handler function, for convenience. The reset handler runs
-	// startup code and the scheduler. The listed stack size is not the full
-	// stack size: interrupts are not counted.
-	var resetFunction string
-	switch f.Machine {
-	case elf.EM_ARM:
-		// Note: all interrupts happen on this stack so the real size is bigger.
-		resetFunction = "Reset_Handler"
-	}
-	if resetFunction != "" {
-		funcs := functions[resetFunction]
-		if len(funcs) != 1 {
-			return nil, nil, fmt.Errorf("expected exactly one definition of %s in the callgraph, found %d", resetFunction, len(funcs))
-		}
-		stackSize, stackSizeType, missingStackSize := funcs[0].StackSize()
-		sizes[resetFunction] = functionStackSize{
-			stackSize:        stackSize,
-			stackSizeType:    stackSizeType,
-			missingStackSize: missingStackSize,
-			humanName:        resetFunction,
-		}
-	}
-
-	// Add all goroutine wrapper functions.
-	for _, name := range gowrappers {
-		funcs := functions[name]
-		if len(funcs) != 1 {
-			return nil, nil, fmt.Errorf("expected exactly one definition of %s in the callgraph, found %d", name, len(funcs))
-		}
-		humanName := gowrapperNames[name]
-		if humanName == "" {
-			humanName = name // fallback
-		}
-		stackSize, stackSizeType, missingStackSize := funcs[0].StackSize()
-		if baseStackSizeType != stacksize.Bounded {
-			// It was not possible to determine the stack size at compile time
-			// because tinygo_startTask does not have a fixed stack size. This
-			// can happen when using -opt=1.
-			stackSizeType = baseStackSizeType
-			missingStackSize = baseStackSizeFailedAt
-		} else if stackSize < baseStackSize {
-			// This goroutine has a very small stack, but still needs to fit all
-			// registers to start and suspend the goroutine. Otherwise a stack
-			// overflow will occur even before the goroutine is started.
-			stackSize = baseStackSize
-		}
-		sizes[name] = functionStackSize{
-			stackSize:        stackSize,
-			stackSizeType:    stackSizeType,
-			missingStackSize: missingStackSize,
-			humanName:        humanName,
-		}
-	}
-
-	if resetFunction != "" {
-		return append([]string{resetFunction}, gowrappers...), sizes, nil
-	}
-	return gowrappers, sizes, nil
-}
-
-// modifyStackSizes modifies the .tinygo_stacksizes section with the updated
-// stack size information. Before this modification, all stack sizes in the
-// section assume the default stack size (which is relatively big).
-func modifyStackSizes(executable string, stackSizeLoads []string, stackSizes map[string]functionStackSize) error {
-	fp, err := os.OpenFile(executable, os.O_RDWR, 0)
-	if err != nil {
-		return err
-	}
-	defer fp.Close()
-
-	elfFile, err := elf.NewFile(fp)
-	if err != nil {
-		return err
-	}
-
-	section := elfFile.Section(".tinygo_stacksizes")
-	if section == nil {
-		return errors.New("could not find .tinygo_stacksizes section")
-	}
-
-	if section.Size != section.FileSize {
-		// Sanity check.
-		return fmt.Errorf("expected .tinygo_stacksizes to have identical size and file size, got %d and %d", section.Size, section.FileSize)
-	}
-
-	// Read all goroutine stack sizes.
-	data := make([]byte, section.Size)
-	_, err = fp.ReadAt(data, int64(section.Offset))
-	if err != nil {
-		return err
-	}
-
-	if len(stackSizeLoads)*4 != len(data) {
-		// Note: while AVR should use 2 byte stack sizes, even 64-bit platforms
-		// should probably stick to 4 byte stack sizes as a larger than 4GB
-		// stack doesn't make much sense.
-		return errors.New("expected 4 byte stack sizes")
-	}
-
-	// Modify goroutine stack sizes with a compile-time known worst case stack
-	// size.
-	for i, name := range stackSizeLoads {
-		fn, ok := stackSizes[name]
-		if !ok {
-			return fmt.Errorf("could not find symbol %s in ELF file", name)
-		}
-		if fn.stackSizeType == stacksize.Bounded {
-			stackSize := uint32(fn.stackSize)
-
-			// Adding 4 for the stack canary. Even though the size may be
-			// automatically determined, stack overflow checking is still
-			// important as the stack size cannot be determined for all
-			// goroutines.
-			stackSize += 4
-
-			// Add stack size used by interrupts.
-			switch elfFile.Machine {
-			case elf.EM_ARM:
-				// On Cortex-M (assumed here), this stack size is 8 words or 32
-				// bytes. This is only to store the registers that the interrupt
-				// may modify, the interrupt will switch to the interrupt stack
-				// (MSP).
-				// Some background:
-				// https://interrupt.memfault.com/blog/cortex-m-rtos-context-switching
-				stackSize += 32
-			}
-
-			// Finally write the stack size to the binary.
-			binary.LittleEndian.PutUint32(data[i*4:], stackSize)
-		}
-	}
-
-	// Write back the modified stack sizes.
-	_, err = fp.WriteAt(data, int64(section.Offset))
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// printStacks prints the maximum stack depth for functions that are started as
-// goroutines. Stack sizes cannot always be determined statically, in particular
-// recursive functions and functions that call interface methods or function
-// pointers may have an unknown stack depth (depending on what the optimizer
-// manages to optimize away).
-//
-// It might print something like the following:
-//
-//     function                         stack usage (in bytes)
-//     Reset_Handler                    316
-//     examples/blinky2.led1            92
-//     runtime.run$1                    300
-func printStacks(calculatedStacks []string, stackSizes map[string]functionStackSize) {
-	// Print the sizes of all stacks.
-	fmt.Printf("%-32s %s\n", "function", "stack usage (in bytes)")
-	for _, name := range calculatedStacks {
-		fn := stackSizes[name]
-		switch fn.stackSizeType {
-		case stacksize.Bounded:
-			fmt.Printf("%-32s %d\n", fn.humanName, fn.stackSize)
-		case stacksize.Unknown:
-			fmt.Printf("%-32s unknown, %s does not have stack frame information\n", fn.humanName, fn.missingStackSize)
-		case stacksize.Recursive:
-			fmt.Printf("%-32s recursive, %s may call itself\n", fn.humanName, fn.missingStackSize)
-		case stacksize.IndirectCall:
-			fmt.Printf("%-32s unknown, %s calls a function pointer\n", fn.humanName, fn.missingStackSize)
 		}
+		return action(tmppath)
 	}
 }
@@ -21,12 +21,12 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 	if goroot == "" {
 		return nil, errors.New("cannot locate $GOROOT, please set it manually")
 	}
-	major, minor, err := goenv.GetGorootVersion(goroot)
+	major, minor, err := getGorootVersion(goroot)
 	if err != nil {
 		return nil, fmt.Errorf("could not read version from GOROOT (%v): %v", goroot, err)
 	}
-	if major != 1 || minor < 11 || minor > 15 {
-		return nil, fmt.Errorf("requires go version 1.11 through 1.15, got go%d.%d", major, minor)
+	if major != 1 || minor < 11 || minor > 14 {
+		return nil, fmt.Errorf("requires go version 1.11, 1.12, 1.13, or 1.14, got go%d.%d", major, minor)
 	}
 	clangHeaderPath := getClangHeaderPath(goenv.Get("TINYGOROOT"))
 	return &compileopts.Config{
@@ -1,16 +1,71 @@
 package builder

 import (
+	"errors"
+	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strings"
-
-	"tinygo.org/x/go-llvm"
 )

+// 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)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	if s == "" || s[:2] != "go" {
+		return 0, 0, errors.New("could not parse Go version: version does not start with 'go' prefix")
+	}
+
+	parts := strings.Split(s[2:], ".")
+	if len(parts) < 2 {
+		return 0, 0, errors.New("could not parse Go version: version has less than two parts")
+	}
+
+	// Ignore the errors, we don't really handle errors here anyway.
+	var trailing string
+	n, err := fmt.Sscanf(s, "go%d.%d%s", &major, &minor, &trailing)
+	if n == 2 && err == io.EOF {
+		// Means there were no trailing characters (i.e., not an alpha/beta)
+		err = nil
+	}
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to parse version: %s", err)
+	}
+	return
+}
+
+// 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 := ioutil.ReadFile(filepath.Join(
+		goroot, "src", "runtime", "internal", "sys", "zversion.go")); err == nil {
+
+		r := regexp.MustCompile("const TheVersion = `(.*)`")
+		matches := r.FindSubmatch(data)
+		if len(matches) != 2 {
+			return "", errors.New("Invalid go version output:\n" + string(data))
+		}
+
+		return string(matches[1]), nil
+
+	} else if data, err := ioutil.ReadFile(filepath.Join(goroot, "VERSION")); err == nil {
+		return string(data), nil
+
+	} else {
+		return "", err
+	}
+}
+
 // 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.
@@ -29,7 +84,6 @@ func getClangHeaderPath(TINYGOROOT string) string {

 	// 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 {
@@ -44,38 +98,22 @@ func getClangHeaderPath(TINYGOROOT string) string {
 			// 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 {
+			llvmRoot := filepath.Dir(filepath.Dir(binpath))
+			clangVersionRoot := filepath.Join(llvmRoot, "lib", "clang")
+			dirs, err := ioutil.ReadDir(clangVersionRoot)
+			if err != 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++
-				}
+			dirnames := make([]string, len(dirs))
+			for i, d := range dirs {
+				dirnames[i] = d.Name()
 			}
 			sort.Strings(dirnames)
 			// Check for the highest version first.
-			for i := dirCount - 1; i >= 0; i-- {
-				path := filepath.Join(dirnames[i], "include")
+			for i := len(dirnames) - 1; i >= 0; i-- {
+				path := filepath.Join(clangVersionRoot, dirnames[i], "include")
 				_, err := os.Stat(filepath.Join(path, "stdint.h"))
 				if err == nil {
 					return path
@@ -1,153 +0,0 @@
-package builder
-
-// This file implements support for writing ESP image files. These image files
-// are read by the ROM bootloader so have to be in a particular format.
-//
-// In the future, it may be necessary to implement support for other image
-// formats, such as the ESP8266 image formats (again, used by the ROM bootloader
-// to load the firmware).
-
-import (
-	"bytes"
-	"crypto/sha256"
-	"debug/elf"
-	"encoding/binary"
-	"fmt"
-	"io/ioutil"
-	"sort"
-)
-
-type espImageSegment struct {
-	addr uint32
-	data []byte
-}
-
-// makeESPFirmare converts an input ELF file to an image file for an ESP32 or
-// ESP8266 chip. This is a special purpose image format just for the ESP chip
-// family, and is parsed by the on-chip mask ROM bootloader.
-//
-// The following documentation has been used:
-// https://github.com/espressif/esptool/wiki/Firmware-Image-Format
-// https://github.com/espressif/esp-idf/blob/8fbb63c2a701c22ccf4ce249f43aded73e134a34/components/bootloader_support/include/esp_image_format.h#L58
-// https://github.com/espressif/esptool/blob/master/esptool.py
-func makeESPFirmareImage(infile, outfile, format string) error {
-	inf, err := elf.Open(infile)
-	if err != nil {
-		return err
-	}
-	defer inf.Close()
-
-	// Load all segments to be written to the image. These are actually ELF
-	// sections, not true ELF segments (similar to how esptool does it).
-	var segments []*espImageSegment
-	for _, section := range inf.Sections {
-		if section.Type != elf.SHT_PROGBITS || section.Size == 0 || section.Flags&elf.SHF_ALLOC == 0 {
-			continue
-		}
-		data, err := section.Data()
-		if err != nil {
-			return fmt.Errorf("failed to read section data: %w", err)
-		}
-		for len(data)%4 != 0 {
-			// Align segment to 4 bytes.
-			data = append(data, 0)
-		}
-		if uint64(uint32(section.Addr)) != section.Addr {
-			return fmt.Errorf("section address too big: 0x%x", section.Addr)
-		}
-		segments = append(segments, &espImageSegment{
-			addr: uint32(section.Addr),
-			data: data,
-		})
-	}
-
-	// Sort the segments by address. This is what esptool does too.
-	sort.SliceStable(segments, func(i, j int) bool { return segments[i].addr < segments[j].addr })
-
-	// Calculate checksum over the segment data. This is used in the image
-	// footer.
-	checksum := uint8(0xef)
-	for _, segment := range segments {
-		for _, b := range segment.data {
-			checksum ^= b
-		}
-	}
-
-	// Write first to an in-memory buffer, primarily so that we can easily
-	// calculate a hash over the entire image.
-	// An added benefit is that we don't need to check for errors all the time.
-	outf := &bytes.Buffer{}
-
-	// Image header.
-	switch format {
-	case "esp32":
-		// Header format:
-		// https://github.com/espressif/esp-idf/blob/8fbb63c2/components/bootloader_support/include/esp_image_format.h#L58
-		binary.Write(outf, binary.LittleEndian, struct {
-			magic          uint8
-			segment_count  uint8
-			spi_mode       uint8
-			spi_speed_size uint8
-			entry_addr     uint32
-			wp_pin         uint8
-			spi_pin_drv    [3]uint8
-			reserved       [11]uint8
-			hash_appended  bool
-		}{
-			magic:          0xE9,
-			segment_count:  byte(len(segments)),
-			spi_mode:       0, // irrelevant, replaced by esptool when flashing
-			spi_speed_size: 0, // spi_speed, spi_size: replaced by esptool when flashing
-			entry_addr:     uint32(inf.Entry),
-			wp_pin:         0xEE, // disable WP pin
-			hash_appended:  true, // add a SHA256 hash
-		})
-	case "esp8266":
-		// Header format:
-		// https://github.com/espressif/esptool/wiki/Firmware-Image-Format
-		// Basically a truncated version of the ESP32 header.
-		binary.Write(outf, binary.LittleEndian, struct {
-			magic          uint8
-			segment_count  uint8
-			spi_mode       uint8
-			spi_speed_size uint8
-			entry_addr     uint32
-		}{
-			magic:          0xE9,
-			segment_count:  byte(len(segments)),
-			spi_mode:       0,    // irrelevant, replaced by esptool when flashing
-			spi_speed_size: 0x20, // spi_speed, spi_size: replaced by esptool when flashing
-			entry_addr:     uint32(inf.Entry),
-		})
-	default:
-		return fmt.Errorf("builder: unknown binary format %#v, expected esp32 or esp8266", format)
-	}
-
-	// Write all segments to the image.
-	// https://github.com/espressif/esptool/wiki/Firmware-Image-Format#segment
-	for _, segment := range segments {
-		binary.Write(outf, binary.LittleEndian, struct {
-			addr   uint32
-			length uint32
-		}{
-			addr:   segment.addr,
-			length: uint32(len(segment.data)),
-		})
-		outf.Write(segment.data)
-	}
-
-	// Footer, including checksum.
-	// The entire image size must be a multiple of 16, so pad the image to one
-	// byte less than that before writing the checksum.
-	outf.Write(make([]byte, 15-outf.Len()%16))
-	outf.WriteByte(checksum)
-
-	if format == "esp32" {
-		// SHA256 hash (to protect against image corruption, not for security).
-		hash := sha256.Sum256(outf.Bytes())
-		outf.Write(hash[:])
-	}
-
-	// Write the image to the output file.
-	return ioutil.WriteFile(outfile, outf.Bytes(), 0666)
-}
@@ -69,14 +69,11 @@ func (l *Library) Load(target string) (path string, err error) {
 	// Precalculate the flags to the compiler invocation.
 	args := append(l.cflags(), "-c", "-Oz", "-g", "-ffunction-sections", "-fdata-sections", "-Wno-macro-redefined", "--target="+target, "-fdebug-prefix-map="+dir+"="+remapDir)
 	if strings.HasPrefix(target, "arm") || strings.HasPrefix(target, "thumb") {
-		args = append(args, "-fshort-enums", "-fomit-frame-pointer", "-mfloat-abi=soft")
+		args = append(args, "-fshort-enums", "-fomit-frame-pointer")
 	}
 	if strings.HasPrefix(target, "riscv32-") {
 		args = append(args, "-march=rv32imac", "-mabi=ilp32", "-fforce-enable-int128")
 	}
-	if strings.HasPrefix(target, "riscv64-") {
-		args = append(args, "-march=rv64gc", "-mabi=lp64")
-	}

 	// Compile all sources.
 	var objs []string
@@ -4,15 +4,12 @@ import (
 	"debug/elf"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"sort"

 	"github.com/marcinbor85/gohex"
 )

-// maxPadBytes is the maximum allowed bytes to be padded in a rom extraction
-// this value is currently defined by Nintendo Switch Page Alignment (4096 bytes)
-const maxPadBytes = 4095
-
 // objcopyError is an error returned by functions that act like objcopy.
 type objcopyError struct {
 	Op  string
@@ -61,7 +58,7 @@ func extractROM(path string) (uint64, []byte, error) {

 	progs := make(progSlice, 0, 2)
 	for _, prog := range f.Progs {
-		if prog.Type != elf.PT_LOAD || prog.Filesz == 0 || prog.Off == 0 {
+		if prog.Type != elf.PT_LOAD || prog.Filesz == 0 {
 			continue
 		}
 		progs = append(progs, prog)
@@ -73,19 +70,8 @@ func extractROM(path string) (uint64, []byte, error) {

 	var rom []byte
 	for _, prog := range progs {
-		romEnd := progs[0].Paddr + uint64(len(rom))
-		if prog.Paddr > romEnd && prog.Paddr < romEnd+16 {
-			// Sometimes, the linker seems to insert a bit of padding between
-			// segments. Simply zero-fill these parts.
-			rom = append(rom, make([]byte, prog.Paddr-romEnd)...)
-		}
 		if prog.Paddr != progs[0].Paddr+uint64(len(rom)) {
-			diff := prog.Paddr - (progs[0].Paddr + uint64(len(rom)))
-			if diff > maxPadBytes {
-				return 0, nil, objcopyError{"ROM segments are non-contiguous: " + path, nil}
-			}
-			// Pad the difference
-			rom = append(rom, make([]byte, diff)...)
+			return 0, nil, objcopyError{"ROM segments are non-contiguous: " + path, nil}
 		}
 		data, err := ioutil.ReadAll(prog.Open())
 		if err != nil {
@@ -107,7 +93,7 @@ func extractROM(path string) (uint64, []byte, error) {

 // objcopy converts an ELF file to a different (simpler) output file format:
 // .bin or .hex. It extracts only the .text section.
-func objcopy(infile, outfile, binaryFormat string) error {
+func objcopy(infile, outfile string) error {
 	f, err := os.OpenFile(outfile, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
 	if err != nil {
 		return err
@@ -121,20 +107,24 @@ func objcopy(infile, outfile, binaryFormat string) error {
 	}

 	// Write to the file, in the correct format.
-	switch binaryFormat {
-	case "hex":
-		// Intel hex file, includes the firmware start address.
+	switch filepath.Ext(outfile) {
+	case ".gba":
+		// The address is not stored in a .gba file.
+		_, err := f.Write(data)
+		return err
+	case ".bin":
+		// The address is not stored in a .bin file (therefore you
+		// should use .hex files in most cases).
+		_, err := f.Write(data)
+		return err
+	case ".hex":
 		mem := gohex.NewMemory()
 		err := mem.AddBinary(uint32(addr), data)
 		if err != nil {
 			return objcopyError{"failed to create .hex file", err}
 		}
-		return mem.DumpIntelHex(f, 16)
-	case "bin":
-		// The start address is not stored in raw firmware files (therefore you
-		// should use .hex files in most cases).
-		_, err := f.Write(data)
-		return err
+		mem.DumpIntelHex(f, 16) // TODO: handle error
+		return nil
 	default:
 		panic("unreachable")
 	}
@@ -41,7 +41,6 @@ type cgoPackage struct {
 	elaboratedTypes map[string]*elaboratedTypeInfo
 	enums           map[string]enumInfo
 	anonStructNum   int
-	ldflags         []string
 }

 // constantInfo stores some information about a CGo constant found by libclang
@@ -157,7 +156,7 @@ typedef unsigned long long  _Cgo_ulonglong;
 // newly created *ast.File that should be added to the list of to-be-parsed
 // 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 string, fset *token.FileSet, cflags []string) (*ast.File, []string, []error) {
+func Process(files []*ast.File, dir string, fset *token.FileSet, cflags []string) (*ast.File, []error) {
 	p := &cgoPackage{
 		dir:             dir,
 		fset:            fset,
@@ -184,7 +183,7 @@ func Process(files []*ast.File, dir string, fset *token.FileSet, cflags []string
 	// Find the absolute path for this package.
 	packagePath, err := filepath.Abs(fset.File(files[0].Pos()).Name())
 	if err != nil {
-		return nil, nil, []error{
+		return nil, []error{
 			scanner.Error{
 				Pos: fset.Position(files[0].Pos()),
 				Msg: "cgo: cannot find absolute path: " + err.Error(), // TODO: wrap this error
@@ -360,19 +359,6 @@ func Process(files []*ast.File, dir string, fset *token.FileSet, cflags []string
 					}
 					makePathsAbsolute(flags, packagePath)
 					cflags = append(cflags, flags...)
-				case "LDFLAGS":
-					flags, err := shlex.Split(value)
-					if err != nil {
-						// TODO: find the exact location where the error happened.
-						p.addErrorAfter(comment.Slash, comment.Text[:lineStart+colon+1], "failed to parse flags in #cgo line: "+err.Error())
-						continue
-					}
-					if err := checkLinkerFlags(name, flags); err != nil {
-						p.addErrorAfter(comment.Slash, comment.Text[:lineStart+colon+1], err.Error())
-						continue
-					}
-					makePathsAbsolute(flags, packagePath)
-					p.ldflags = append(p.ldflags, flags...)
 				default:
 					startPos := strings.LastIndex(line[4:colon], name) + 4
 					p.addErrorAfter(comment.Slash, comment.Text[:lineStart+startPos], "invalid #cgo line: "+name)
@@ -426,7 +412,7 @@ func Process(files []*ast.File, dir string, fset *token.FileSet, cflags []string
 	// Print the newly generated in-memory AST, for debugging.
 	//ast.Print(fset, p.generated)

-	return p.generated, p.ldflags, p.errors
+	return p.generated, p.errors
 }

 // makePathsAbsolute converts some common path compiler flags (-I, -L) from
@@ -50,7 +50,7 @@ func TestCGo(t *testing.T) {
 			}

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

 			// Check the AST for type errors.
 			var typecheckErrors []error
@@ -246,9 +246,9 @@ func tinygo_clang_globals_visitor(c, parent C.GoCXCursor, client_data C.CXClient
 		}
 		value := source[len(name):]
 		// Try to convert this #define into a Go constant expression.
-		expr, scannerError := parseConst(pos+token.Pos(len(name)), p.fset, value)
-		if scannerError != nil {
-			p.errors = append(p.errors, *scannerError)
+		expr, err := parseConst(pos+token.Pos(len(name)), p.fset, value)
+		if err != nil {
+			p.errors = append(p.errors, err)
 		}
 		if expr != nil {
 			// Parsing was successful.
@@ -1,5 +1,5 @@
 // +build !byollvm
-// +build !llvm9,!llvm11
+// +build !llvm9

 package cgo

@@ -1,14 +0,0 @@
-// +build !byollvm
-// +build llvm11
-
-package cgo
-
-/*
-#cgo linux   CFLAGS:  -I/usr/lib/llvm-11/include
-#cgo darwin  CFLAGS:  -I/usr/local/opt/llvm@11/include
-#cgo freebsd CFLAGS:  -I/usr/local/llvm11/include
-#cgo linux   LDFLAGS: -L/usr/lib/llvm-11/lib -lclang
-#cgo darwin  LDFLAGS: -L/usr/local/opt/llvm@11/lib -lclang -lffi
-#cgo freebsd LDFLAGS: -L/usr/local/llvm11/lib -lclang
-*/
-import "C"
@@ -21,13 +21,6 @@ package main
 #if defined(NOTDEFINED)
 #warning flag must not be defined
 #endif
-
-// Check Compiler flags
-#cgo LDFLAGS: -lc
-
-// This flag is not valid ldflags
-#cgo LDFLAGS: -does-not-exists
-
 */
 import "C"

@@ -1,7 +1,6 @@
 // CGo errors:
 //     testdata/flags.go:5:7: invalid #cgo line: NOFLAGS
 //     testdata/flags.go:8:13: invalid flag: -fdoes-not-exist
-//     testdata/flags.go:29:14: invalid flag: -does-not-exists

 package main

@@ -118,19 +118,19 @@ func (c *Config) NeedsStackObjects() bool {
 	switch c.GC() {
 	case "conservative", "extalloc":
 		for _, tag := range c.BuildTags() {
-			if tag == "wasm" {
-				return true
+			if tag == "baremetal" {
+				return false
 			}
 		}

-		return false
+		return true
 	default:
 		return false
 	}
 }

-// Scheduler returns the scheduler implementation. Valid values are "none",
-//"coroutines" and "tasks".
+// Scheduler returns the scheduler implementation. Valid values are "coroutines"
+// and "tasks".
 func (c *Config) Scheduler() string {
 	if c.Options.Scheduler != "" {
 		return c.Options.Scheduler
@@ -164,16 +164,6 @@ func (c *Config) PanicStrategy() string {
 	return c.Options.PanicStrategy
 }

-// AutomaticStackSize returns whether goroutine stack sizes should be determined
-// automatically at compile time, if possible. If it is false, no attempt is
-// made.
-func (c *Config) AutomaticStackSize() bool {
-	if c.Target.AutoStackSize != nil && c.Scheduler() == "tasks" {
-		return *c.Target.AutoStackSize
-	}
-	return false
-}
-
 // CFlags returns the flags to pass to the C compiler. This is necessary for CGo
 // preprocessing.
 func (c *Config) CFlags() []string {
@@ -186,9 +176,6 @@ func (c *Config) CFlags() []string {
 		cflags = append(cflags, "-nostdlibinc", "-Xclang", "-internal-isystem", "-Xclang", filepath.Join(root, "lib", "picolibc", "newlib", "libc", "include"))
 		cflags = append(cflags, "-I"+filepath.Join(root, "lib/picolibc-include"))
 	}
-	if c.Debug() {
-		cflags = append(cflags, "-g")
-	}
 	return cflags
 }

@@ -239,31 +226,6 @@ func (c *Config) Debug() bool {
 	return c.Options.Debug
 }

-// BinaryFormat returns an appropriate binary format, based on the file
-// extension and the configured binary format in the target JSON file.
-func (c *Config) BinaryFormat(ext string) string {
-	switch ext {
-	case ".bin", ".gba", ".nro":
-		// The simplest format possible: dump everything in a raw binary file.
-		if c.Target.BinaryFormat != "" {
-			return c.Target.BinaryFormat
-		}
-		return "bin"
-	case ".hex":
-		// Similar to bin, but includes the start address and is thus usually a
-		// better format.
-		return "hex"
-	case ".uf2":
-		// Special purpose firmware format, mainly used on Adafruit boards.
-		// More information:
-		// https://github.com/Microsoft/uf2
-		return "uf2"
-	default:
-		// Use the ELF format for unrecognized file formats.
-		return "elf"
-	}
-}
-
 // Programmer returns the flash method and OpenOCD interface name given a
 // particular configuration. It may either be all configured in the target JSON
 // file or be modified using the -programmmer command-line option.
@@ -310,34 +272,6 @@ func (c *Config) OpenOCDConfiguration() (args []string, err error) {
 	return args, nil
 }

-// CodeModel returns the code model used on this platform.
-func (c *Config) CodeModel() string {
-	if c.Target.CodeModel != "" {
-		return c.Target.CodeModel
-	}
-
-	return "default"
-}
-
-// RelocationModel returns the relocation model in use on this platform. Valid
-// values are "static", "pic", "dynamicnopic".
-func (c *Config) RelocationModel() string {
-	if c.Target.RelocationModel != "" {
-		return c.Target.RelocationModel
-	}
-
-	return "static"
-}
-
-// WasmAbi returns the WASM ABI which is specified in the target JSON file, and
-// the value is overridden by `-wasm-abi` flag if it is provided
-func (c *Config) WasmAbi() string {
-	if c.Options.WasmAbi != "" {
-		return c.Options.WasmAbi
-	}
-	return c.Target.WasmAbi
-}
-
 type TestConfig struct {
 	CompileTestBinary bool
 	// TODO: Filter the test functions to run, include verbose flag, etc
@@ -1,17 +1,5 @@
 package compileopts

-import (
-	"fmt"
-	"strings"
-)
-
-var (
-	validGCOptions            = []string{"none", "leaking", "extalloc", "conservative"}
-	validSchedulerOptions     = []string{"none", "tasks", "coroutines"}
-	validPrintSizeOptions     = []string{"none", "short", "full"}
-	validPanicStrategyOptions = []string{"print", "trap"}
-)
-
 // Options contains extra options to give to the compiler. These options are
 // usually passed from the command line.
 type Options struct {
@@ -25,7 +13,6 @@ type Options struct {
 	VerifyIR      bool
 	Debug         bool
 	PrintSizes    string
-	PrintStacks   bool
 	CFlags        []string
 	LDFlags       []string
 	Tags          string
@@ -34,53 +21,3 @@ type Options struct {
 	TestConfig    TestConfig
 	Programmer    string
 }
-
-// Verify performs a validation on the given options, raising an error if options are not valid.
-func (o *Options) Verify() error {
-	if o.GC != "" {
-		valid := isInArray(validGCOptions, o.GC)
-		if !valid {
-			return fmt.Errorf(`invalid gc option '%s': valid values are %s`,
-				o.GC,
-				strings.Join(validGCOptions, ", "))
-		}
-	}
-
-	if o.Scheduler != "" {
-		valid := isInArray(validSchedulerOptions, o.Scheduler)
-		if !valid {
-			return fmt.Errorf(`invalid scheduler option '%s': valid values are %s`,
-				o.Scheduler,
-				strings.Join(validSchedulerOptions, ", "))
-		}
-	}
-
-	if o.PrintSizes != "" {
-		valid := isInArray(validPrintSizeOptions, o.PrintSizes)
-		if !valid {
-			return fmt.Errorf(`invalid size option '%s': valid values are %s`,
-				o.PrintSizes,
-				strings.Join(validPrintSizeOptions, ", "))
-		}
-	}
-
-	if o.PanicStrategy != "" {
-		valid := isInArray(validPanicStrategyOptions, o.PanicStrategy)
-		if !valid {
-			return fmt.Errorf(`invalid panic option '%s': valid values are %s`,
-				o.PanicStrategy,
-				strings.Join(validPanicStrategyOptions, ", "))
-		}
-	}
-
-	return nil
-}
-
-func isInArray(arr []string, item string) bool {
-	for _, i := range arr {
-		if i == item {
-			return true
-		}
-	}
-	return false
-}
@@ -1,138 +0,0 @@
-package compileopts_test
-
-import (
-	"errors"
-	"testing"
-
-	"github.com/tinygo-org/tinygo/compileopts"
-)
-
-func TestVerifyOptions(t *testing.T) {
-
-	expectedGCError := errors.New(`invalid gc option 'incorrect': valid values are none, leaking, extalloc, conservative`)
-	expectedSchedulerError := errors.New(`invalid scheduler option 'incorrect': valid values are none, tasks, coroutines`)
-	expectedPrintSizeError := errors.New(`invalid size option 'incorrect': valid values are none, short, full`)
-	expectedPanicStrategyError := errors.New(`invalid panic option 'incorrect': valid values are print, trap`)
-
-	testCases := []struct {
-		name          string
-		opts          compileopts.Options
-		expectedError error
-	}{
-		{
-			name: "OptionsEmpty",
-			opts: compileopts.Options{},
-		},
-		{
-			name: "InvalidGCOption",
-			opts: compileopts.Options{
-				GC: "incorrect",
-			},
-			expectedError: expectedGCError,
-		},
-		{
-			name: "GCOptionNone",
-			opts: compileopts.Options{
-				GC: "none",
-			},
-		},
-		{
-			name: "GCOptionLeaking",
-			opts: compileopts.Options{
-				GC: "leaking",
-			},
-		},
-		{
-			name: "GCOptionExtalloc",
-			opts: compileopts.Options{
-				GC: "extalloc",
-			},
-		},
-		{
-			name: "GCOptionConservative",
-			opts: compileopts.Options{
-				GC: "conservative",
-			},
-		},
-		{
-			name: "InvalidSchedulerOption",
-			opts: compileopts.Options{
-				Scheduler: "incorrect",
-			},
-			expectedError: expectedSchedulerError,
-		},
-		{
-			name: "SchedulerOptionNone",
-			opts: compileopts.Options{
-				Scheduler: "none",
-			},
-		},
-		{
-			name: "SchedulerOptionTasks",
-			opts: compileopts.Options{
-				Scheduler: "tasks",
-			},
-		},
-		{
-			name: "SchedulerOptionCoroutines",
-			opts: compileopts.Options{
-				Scheduler: "coroutines",
-			},
-		},
-		{
-			name: "InvalidPrintSizeOption",
-			opts: compileopts.Options{
-				PrintSizes: "incorrect",
-			},
-			expectedError: expectedPrintSizeError,
-		},
-		{
-			name: "PrintSizeOptionNone",
-			opts: compileopts.Options{
-				PrintSizes: "none",
-			},
-		},
-		{
-			name: "PrintSizeOptionShort",
-			opts: compileopts.Options{
-				PrintSizes: "short",
-			},
-		},
-		{
-			name: "PrintSizeOptionFull",
-			opts: compileopts.Options{
-				PrintSizes: "full",
-			},
-		},
-		{
-			name: "InvalidPanicOption",
-			opts: compileopts.Options{
-				PanicStrategy: "incorrect",
-			},
-			expectedError: expectedPanicStrategyError,
-		},
-		{
-			name: "PanicOptionPrint",
-			opts: compileopts.Options{
-				PanicStrategy: "print",
-			},
-		},
-		{
-			name: "PanicOptionTrap",
-			opts: compileopts.Options{
-				PanicStrategy: "trap",
-			},
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			err := tc.opts.Verify()
-			if tc.expectedError != err {
-				if tc.expectedError.Error() != err.Error() {
-					t.Errorf("expected %v, got %v", tc.expectedError, err)
-				}
-			}
-		})
-	}
-}
@@ -8,7 +8,6 @@ import (
 	"io"
 	"os"
 	"path/filepath"
-	"reflect"
 	"runtime"
 	"strings"

@@ -34,13 +33,11 @@ type TargetSpec struct {
 	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"`
-	Emulator         []string `json:"emulator" override:"copy"` // inherited Emulator must not be append
+	Emulator         []string `json:"emulator"`
 	FlashCommand     string   `json:"flash-command"`
 	GDB              string   `json:"gdb"`
 	PortReset        string   `json:"flash-1200-bps-reset"`
@@ -48,56 +45,90 @@ type TargetSpec struct {
 	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"`
 	JLinkDevice      string   `json:"jlink-device"`
-	CodeModel        string   `json:"code-model"`
-	RelocationModel  string   `json:"relocation-model"`
-	WasmAbi          string   `json:"wasm-abi"`
 }

-// overrideProperties overrides all properties that are set in child into itself using reflection.
-func (spec *TargetSpec) overrideProperties(child *TargetSpec) {
-	specType := reflect.TypeOf(spec).Elem()
-	specValue := reflect.ValueOf(spec).Elem()
-	childValue := reflect.ValueOf(child).Elem()
-
-	for i := 0; i < specType.NumField(); i++ {
-		field := specType.Field(i)
-		src := childValue.Field(i)
-		dst := specValue.Field(i)
-
-		switch kind := field.Type.Kind(); kind {
-		case reflect.String: // for strings, just copy the field of child to spec if not empty
-			if src.Len() > 0 {
-				dst.Set(src)
-			}
-		case reflect.Uint, reflect.Uint32, reflect.Uint64: // for Uint, copy if not zero
-			if src.Uint() != 0 {
-				dst.Set(src)
-			}
-		case reflect.Ptr: // for pointers, copy if not nil
-			if !src.IsNil() {
-				dst.Set(src)
-			}
-		case reflect.Slice: // for slices...
-			if src.Len() > 0 { // ... if not empty ...
-				switch tag := field.Tag.Get("override"); tag {
-				case "copy":
-					// copy the field of child to spec
-					dst.Set(src)
-				case "append", "":
-					// or append the field of child to spec
-					dst.Set(reflect.AppendSlice(src, dst))
-				default:
-					panic("override mode must be 'copy' or 'append' (default). I don't know how to '" + tag + "'.")
-				}
-			}
-		default:
-			panic("unknown field type : " + kind.String())
-		}
+// copyProperties copies all properties that are set in spec2 into itself.
+func (spec *TargetSpec) copyProperties(spec2 *TargetSpec) {
+	// TODO: simplify this using reflection? Inherits and BuildTags are special
+	// cases, but the rest can simply be copied if set.
+	spec.Inherits = append(spec.Inherits, spec2.Inherits...)
+	if spec2.Triple != "" {
+		spec.Triple = spec2.Triple
+	}
+	if spec2.CPU != "" {
+		spec.CPU = spec2.CPU
+	}
+	spec.Features = append(spec.Features, spec2.Features...)
+	if spec2.GOOS != "" {
+		spec.GOOS = spec2.GOOS
+	}
+	if spec2.GOARCH != "" {
+		spec.GOARCH = spec2.GOARCH
+	}
+	spec.BuildTags = append(spec.BuildTags, spec2.BuildTags...)
+	if spec2.GC != "" {
+		spec.GC = spec2.GC
+	}
+	if spec2.Scheduler != "" {
+		spec.Scheduler = spec2.Scheduler
+	}
+	if spec2.Compiler != "" {
+		spec.Compiler = spec2.Compiler
+	}
+	if spec2.Linker != "" {
+		spec.Linker = spec2.Linker
+	}
+	if spec2.RTLib != "" {
+		spec.RTLib = spec2.RTLib
+	}
+	if spec2.Libc != "" {
+		spec.Libc = spec2.Libc
+	}
+	spec.CFlags = append(spec.CFlags, spec2.CFlags...)
+	spec.LDFlags = append(spec.LDFlags, spec2.LDFlags...)
+	if spec2.LinkerScript != "" {
+		spec.LinkerScript = spec2.LinkerScript
+	}
+	spec.ExtraFiles = append(spec.ExtraFiles, spec2.ExtraFiles...)
+	if len(spec2.Emulator) != 0 {
+		spec.Emulator = spec2.Emulator
+	}
+	if spec2.FlashCommand != "" {
+		spec.FlashCommand = spec2.FlashCommand
+	}
+	if spec2.GDB != "" {
+		spec.GDB = spec2.GDB
+	}
+	if spec2.PortReset != "" {
+		spec.PortReset = spec2.PortReset
+	}
+	if spec2.FlashMethod != "" {
+		spec.FlashMethod = spec2.FlashMethod
+	}
+	if spec2.FlashVolume != "" {
+		spec.FlashVolume = spec2.FlashVolume
+	}
+	if spec2.FlashFilename != "" {
+		spec.FlashFilename = spec2.FlashFilename
+	}
+	if spec2.UF2FamilyID != "" {
+		spec.UF2FamilyID = spec2.UF2FamilyID
+	}
+	if spec2.OpenOCDInterface != "" {
+		spec.OpenOCDInterface = spec2.OpenOCDInterface
+	}
+	if spec2.OpenOCDTarget != "" {
+		spec.OpenOCDTarget = spec2.OpenOCDTarget
+	}
+	if spec2.OpenOCDTransport != "" {
+		spec.OpenOCDTransport = spec2.OpenOCDTransport
+	}
+	if spec2.JLinkDevice != "" {
+		spec.JLinkDevice = spec2.JLinkDevice
 	}
 }

@@ -146,11 +177,11 @@ func (spec *TargetSpec) resolveInherits() error {
 		if err != nil {
 			return err
 		}
-		newSpec.overrideProperties(subtarget)
+		newSpec.copyProperties(subtarget)
 	}

 	// When all properties are loaded, make sure they are properly inherited.
-	newSpec.overrideProperties(spec)
+	newSpec.copyProperties(spec)
 	*spec = *newSpec

 	return nil
@@ -216,7 +247,6 @@ func LoadTarget(target string) (*TargetSpec, error) {
 		}
 		goarch := map[string]string{ // map from LLVM arch to Go arch
 			"i386":    "386",
-			"i686":    "386",
 			"x86_64":  "amd64",
 			"aarch64": "arm64",
 			"armv7":   "arm",
@@ -232,40 +262,39 @@ func defaultTarget(goos, goarch, triple string) (*TargetSpec, error) {
 	// No target spec available. Use the default one, useful on most systems
 	// with a regular OS.
 	spec := TargetSpec{
-		Triple:    triple,
-		GOOS:      goos,
-		GOARCH:    goarch,
-		BuildTags: []string{goos, goarch},
-		Compiler:  "clang",
-		Linker:    "cc",
-		CFlags:    []string{"--target=" + triple},
-		GDB:       "gdb",
-		PortReset: "false",
+		Triple:      triple,
+		GOOS:        goos,
+		GOARCH:      goarch,
+		BuildTags:   []string{goos, goarch},
+		Compiler:    "clang",
+		Linker:      "cc",
+		CFlags:      []string{"--target=" + triple},
+		GDB:         "gdb",
+		PortReset:   "false",
+		FlashMethod: "native",
 	}
 	if goos == "darwin" {
 		spec.LDFlags = append(spec.LDFlags, "-Wl,-dead_strip")
 	} else {
 		spec.LDFlags = append(spec.LDFlags, "-no-pie", "-Wl,--gc-sections") // WARNING: clang < 5.0 requires -nopie
 	}
-	if goarch != "wasm" {
-		spec.ExtraFiles = append(spec.ExtraFiles, "src/runtime/gc_"+goarch+".S")
-	}
 	if goarch != runtime.GOARCH {
 		// Some educated guesses as to how to invoke helper programs.
-		spec.GDB = "gdb-multiarch"
 		if goarch == "arm" && goos == "linux" {
 			spec.CFlags = append(spec.CFlags, "--sysroot=/usr/arm-linux-gnueabihf")
 			spec.Linker = "arm-linux-gnueabihf-gcc"
+			spec.GDB = "arm-linux-gnueabihf-gdb"
 			spec.Emulator = []string{"qemu-arm", "-L", "/usr/arm-linux-gnueabihf"}
 		}
 		if goarch == "arm64" && goos == "linux" {
 			spec.CFlags = append(spec.CFlags, "--sysroot=/usr/aarch64-linux-gnu")
 			spec.Linker = "aarch64-linux-gnu-gcc"
+			spec.GDB = "aarch64-linux-gnu-gdb"
 			spec.Emulator = []string{"qemu-aarch64", "-L", "/usr/aarch64-linux-gnu"}
 		}
-		if goarch == "386" && runtime.GOARCH == "amd64" {
-			spec.CFlags = append(spec.CFlags, "-m32")
-			spec.LDFlags = append(spec.LDFlags, "-m32")
+		if goarch == "386" {
+			spec.CFlags = []string{"-m32"}
+			spec.LDFlags = []string{"-m32"}
 		}
 	}
 	return &spec, nil
@@ -1,9 +1,6 @@
 package compileopts

-import (
-	"reflect"
-	"testing"
-)
+import "testing"

 func TestLoadTarget(t *testing.T) {
 	_, err := LoadTarget("arduino")
@@ -20,67 +17,3 @@ func TestLoadTarget(t *testing.T) {
 		t.Error("LoadTarget failed for wrong reason:", err)
 	}
 }
-
-func TestOverrideProperties(t *testing.T) {
-	baseAutoStackSize := true
-	base := &TargetSpec{
-		GOOS:             "baseGoos",
-		CPU:              "baseCpu",
-		Features:         []string{"bf1", "bf2"},
-		BuildTags:        []string{"bt1", "bt2"},
-		Emulator:         []string{"be1", "be2"},
-		DefaultStackSize: 42,
-		AutoStackSize:    &baseAutoStackSize,
-	}
-	childAutoStackSize := false
-	child := &TargetSpec{
-		GOOS:             "",
-		CPU:              "chlidCpu",
-		Features:         []string{"cf1", "cf2"},
-		Emulator:         []string{"ce1", "ce2"},
-		AutoStackSize:    &childAutoStackSize,
-		DefaultStackSize: 64,
-	}
-
-	base.overrideProperties(child)
-
-	if base.GOOS != "baseGoos" {
-		t.Errorf("Overriding failed : got %v", base.GOOS)
-	}
-	if base.CPU != "chlidCpu" {
-		t.Errorf("Overriding failed : got %v", base.CPU)
-	}
-	if !reflect.DeepEqual(base.Features, []string{"cf1", "cf2", "bf1", "bf2"}) {
-		t.Errorf("Overriding failed : got %v", base.Features)
-	}
-	if !reflect.DeepEqual(base.BuildTags, []string{"bt1", "bt2"}) {
-		t.Errorf("Overriding failed : got %v", base.BuildTags)
-	}
-	if !reflect.DeepEqual(base.Emulator, []string{"ce1", "ce2"}) {
-		t.Errorf("Overriding failed : got %v", base.Emulator)
-	}
-	if *base.AutoStackSize != false {
-		t.Errorf("Overriding failed : got %v", base.AutoStackSize)
-	}
-	if base.DefaultStackSize != 64 {
-		t.Errorf("Overriding failed : got %v", base.DefaultStackSize)
-	}
-
-	baseAutoStackSize = true
-	base = &TargetSpec{
-		AutoStackSize:    &baseAutoStackSize,
-		DefaultStackSize: 42,
-	}
-	child = &TargetSpec{
-		AutoStackSize:    nil,
-		DefaultStackSize: 0,
-	}
-	base.overrideProperties(child)
-	if *base.AutoStackSize != true {
-		t.Errorf("Overriding failed : got %v", base.AutoStackSize)
-	}
-	if base.DefaultStackSize != 42 {
-		t.Errorf("Overriding failed : got %v", base.DefaultStackSize)
-	}
-
-}
@@ -16,7 +16,7 @@ import (
 // slice. This is required by the Go language spec: an index out of bounds must
 // cause a panic.
 func (b *builder) createLookupBoundsCheck(arrayLen, index llvm.Value, indexType types.Type) {
-	if b.fn.IsNoBounds() {
+	if b.info.nobounds {
 		// The //go:nobounds pragma was added to the function to avoid bounds
 		// checking.
 		return
@@ -48,7 +48,7 @@ func (b *builder) createLookupBoundsCheck(arrayLen, index llvm.Value, indexType
 // biggest possible slice capacity, 'low' means len and 'high' means cap. The
 // logic is the same in both cases.
 func (b *builder) createSliceBoundsCheck(capacity, low, high, max llvm.Value, lowType, highType, maxType *types.Basic) {
-	if b.fn.IsNoBounds() {
+	if b.info.nobounds {
 		// The //go:nobounds pragma was added to the function to avoid bounds
 		// checking.
 		return
@@ -104,7 +104,7 @@ func (b *builder) createSliceBoundsCheck(capacity, low, high, max llvm.Value, lo
 // createChanBoundsCheck creates a bounds check before creating a new channel to
 // check that the value is not too big for runtime.chanMake.
 func (b *builder) createChanBoundsCheck(elementSize uint64, bufSize llvm.Value, bufSizeType *types.Basic, pos token.Pos) {
-	if b.fn.IsNoBounds() {
+	if b.info.nobounds {
 		// The //go:nobounds pragma was added to the function to avoid bounds
 		// checking.
 		return
@@ -189,7 +189,7 @@ func (b *builder) createNilCheck(inst ssa.Value, ptr llvm.Value, blockPrefix str
 // createNegativeShiftCheck creates an assertion that panics if the given shift value is negative.
 // This function assumes that the shift value is signed.
 func (b *builder) createNegativeShiftCheck(shift llvm.Value) {
-	if b.fn.IsNoBounds() {
+	if b.info.nobounds {
 		// Function disabled bounds checking - skip shift check.
 		return
 	}
@@ -212,8 +212,8 @@ func (b *builder) createRuntimeAssert(assert llvm.Value, blockPrefix, assertFunc
 		}
 	}

-	faultBlock := b.ctx.AddBasicBlock(b.fn.LLVMFn, blockPrefix+".throw")
-	nextBlock := b.ctx.AddBasicBlock(b.fn.LLVMFn, blockPrefix+".next")
+	faultBlock := b.ctx.AddBasicBlock(b.llvmFn, blockPrefix+".throw")
+	nextBlock := b.ctx.AddBasicBlock(b.llvmFn, blockPrefix+".next")
 	b.blockExits[b.currentBlock] = nextBlock // adjust outgoing block for phi nodes

 	// Now branch to the out-of-bounds or the regular block.
@@ -1,57 +0,0 @@
-package compiler
-
-import (
-	"golang.org/x/tools/go/ssa"
-	"tinygo.org/x/go-llvm"
-)
-
-// createAtomicOp lowers an atomic library call by lowering it as an LLVM atomic
-// operation. It returns the result of the operation and true if the call could
-// be lowered inline, and false otherwise.
-func (b *builder) createAtomicOp(call *ssa.CallCommon) (llvm.Value, bool) {
-	name := call.Value.(*ssa.Function).Name()
-	switch name {
-	case "AddInt32", "AddInt64", "AddUint32", "AddUint64", "AddUintptr":
-		ptr := b.getValue(call.Args[0])
-		val := b.getValue(call.Args[1])
-		oldVal := b.CreateAtomicRMW(llvm.AtomicRMWBinOpAdd, ptr, val, llvm.AtomicOrderingSequentiallyConsistent, true)
-		// Return the new value, not the original value returned by atomicrmw.
-		return b.CreateAdd(oldVal, val, ""), true
-	case "SwapInt32", "SwapInt64", "SwapUint32", "SwapUint64", "SwapUintptr", "SwapPointer":
-		ptr := b.getValue(call.Args[0])
-		val := b.getValue(call.Args[1])
-		isPointer := val.Type().TypeKind() == llvm.PointerTypeKind
-		if isPointer {
-			// atomicrmw only supports integers, so cast to an integer.
-			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, true
-	case "CompareAndSwapInt32", "CompareAndSwapInt64", "CompareAndSwapUint32", "CompareAndSwapUint64", "CompareAndSwapUintptr", "CompareAndSwapPointer":
-		ptr := b.getValue(call.Args[0])
-		old := b.getValue(call.Args[1])
-		newVal := b.getValue(call.Args[2])
-		tuple := b.CreateAtomicCmpXchg(ptr, old, newVal, llvm.AtomicOrderingSequentiallyConsistent, llvm.AtomicOrderingSequentiallyConsistent, true)
-		swapped := b.CreateExtractValue(tuple, 1, "")
-		return swapped, true
-	case "LoadInt32", "LoadInt64", "LoadUint32", "LoadUint64", "LoadUintptr", "LoadPointer":
-		ptr := b.getValue(call.Args[0])
-		val := b.CreateLoad(ptr, "")
-		val.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
-		val.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
-		return val, true
-	case "StoreInt32", "StoreInt64", "StoreUint32", "StoreUint64", "StoreUintptr", "StorePointer":
-		ptr := b.getValue(call.Args[0])
-		val := b.getValue(call.Args[1])
-		store := b.CreateStore(val, ptr)
-		store.SetOrdering(llvm.AtomicOrderingSequentiallyConsistent)
-		store.SetAlignment(b.targetData.PrefTypeAlignment(val.Type())) // required
-		return store, true
-	default:
-		return llvm.Value{}, false
-	}
-}
@@ -34,14 +34,12 @@ const (

 // createCall creates a new call to runtime.<fnName> with the given arguments.
 func (b *builder) createRuntimeCall(fnName string, args []llvm.Value, name string) llvm.Value {
-	fullName := "runtime." + fnName
-	fn := b.mod.NamedFunction(fullName)
-	if fn.IsNil() {
-		panic("trying to call non-existent function: " + fullName)
-	}
+	llvmFn := b.getFunctionRaw(b.getRuntimeFuncType(fnName), functionInfo{
+		linkName: "runtime." + fnName,
+	})
 	args = append(args, llvm.Undef(b.i8ptrType))            // unused context parameter
 	args = append(args, llvm.ConstPointerNull(b.i8ptrType)) // coroutine handle
-	return b.createCall(fn, args, name)
+	return b.createCall(llvmFn, args, name)
 }

 // createCall creates a call to the given function with the arguments possibly
@@ -12,7 +12,7 @@ import (
 )

 func (b *builder) createMakeChan(expr *ssa.MakeChan) llvm.Value {
-	elementSize := b.targetData.TypeAllocSize(b.getLLVMType(expr.Type().Underlying().(*types.Chan).Elem()))
+	elementSize := b.targetData.TypeAllocSize(b.getLLVMType(expr.Type().(*types.Chan).Elem()))
 	elementSizeValue := llvm.ConstInt(b.uintptrType, elementSize, false)
 	bufSize := b.getValue(expr.Size)
 	b.createChanBoundsCheck(elementSize, bufSize, expr.Size.Type().Underlying().(*types.Basic), expr.Pos())
@@ -35,37 +35,27 @@ func (b *builder) createChanSend(instr *ssa.Send) {
 	valueAlloca, valueAllocaCast, valueAllocaSize := b.createTemporaryAlloca(valueType, "chan.value")
 	b.CreateStore(chanValue, valueAlloca)

-	// Allocate blockedlist buffer.
-	channelBlockedList := b.mod.GetTypeByName("runtime.channelBlockedList")
-	channelBlockedListAlloca, channelBlockedListAllocaCast, channelBlockedListAllocaSize := b.createTemporaryAlloca(channelBlockedList, "chan.blockedList")
-
 	// Do the send.
-	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAllocaCast, channelBlockedListAlloca}, "")
+	b.createRuntimeCall("chanSend", []llvm.Value{ch, valueAllocaCast}, "")

-	// End the lifetime of the allocas.
+	// End the lifetime of the alloca.
 	// 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(valueAllocaCast, valueAllocaSize)
 }

 // createChanRecv emits a pseudo chan receive operation. It is lowered to the
 // actual channel receive operation during goroutine lowering.
 func (b *builder) createChanRecv(unop *ssa.UnOp) llvm.Value {
-	valueType := b.getLLVMType(unop.X.Type().Underlying().(*types.Chan).Elem())
+	valueType := b.getLLVMType(unop.X.Type().(*types.Chan).Elem())
 	ch := b.getValue(unop.X)

 	// Allocate memory to receive into.
 	valueAlloca, valueAllocaCast, valueAllocaSize := b.createTemporaryAlloca(valueType, "chan.value")

-	// Allocate blockedlist buffer.
-	channelBlockedList := b.mod.GetTypeByName("runtime.channelBlockedList")
-	channelBlockedListAlloca, channelBlockedListAllocaCast, 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, valueAllocaCast}, "")
 	received := b.CreateLoad(valueAlloca, "chan.received")
-	b.emitLifetimeEnd(channelBlockedListAllocaCast, channelBlockedListAllocaSize)
 	b.emitLifetimeEnd(valueAllocaCast, valueAllocaSize)

 	if unop.CommaOk {
@@ -127,7 +117,7 @@ func (b *builder) createSelect(expr *ssa.Select) llvm.Value {
 		switch state.Dir {
 		case types.RecvOnly:
 			// Make sure the receive buffer is big enough and has the correct alignment.
-			llvmType := b.getLLVMType(state.Chan.Type().Underlying().(*types.Chan).Elem())
+			llvmType := b.getLLVMType(state.Chan.Type().(*types.Chan).Elem())
 			if size := b.targetData.TypeAllocSize(llvmType); size > recvbufSize {
 				recvbufSize = size
 			}
@@ -0,0 +1,138 @@
+package compiler
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"go/types"
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/tinygo-org/tinygo/compileopts"
+	"github.com/tinygo-org/tinygo/compiler/ircheck"
+	"golang.org/x/tools/go/ssa"
+	"golang.org/x/tools/go/ssa/ssautil"
+	"tinygo.org/x/go-llvm"
+)
+
+var flagUpdate = flag.Bool("update", false, "update all tests")
+
+func TestCompiler(t *testing.T) {
+	t.Parallel()
+	for _, name := range []string{"basic"} {
+		t.Run(name, func(t *testing.T) {
+			runCompilerTest(t, name)
+		})
+	}
+}
+
+func runCompilerTest(t *testing.T, name string) {
+	// Read the AST in memory.
+	path := filepath.Join("testdata", name+".go")
+	fset := token.NewFileSet()
+	f, err := parser.ParseFile(fset, path, nil, parser.ParseComments)
+	if err != nil {
+		t.Fatal("could not parse Go source file:", err)
+	}
+	files := []*ast.File{f}
+
+	// Create Go SSA from the AST.
+	var typecheckErrors []error
+	var typecheckErrorsLock sync.Mutex
+	typesConfig := types.Config{
+		Error: func(err error) {
+			typecheckErrorsLock.Lock()
+			defer typecheckErrorsLock.Unlock()
+			typecheckErrors = append(typecheckErrors, err)
+		},
+		Importer: simpleImporter{},
+		Sizes:    types.SizesFor("gccgo", "arm"),
+	}
+	pkg, _, err := ssautil.BuildPackage(&typesConfig, fset, types.NewPackage("main", ""), files, ssa.SanityCheckFunctions|ssa.BareInits|ssa.GlobalDebug)
+	for _, err := range typecheckErrors {
+		t.Error(err)
+	}
+	if err != nil && len(typecheckErrors) == 0 {
+		// Only report errors when no type errors are found (an
+		// unexpected condition).
+		t.Error(err)
+	}
+	if t.Failed() {
+		return
+	}
+
+	// Configure the compiler.
+	config := compileopts.Config{
+		Options: &compileopts.Options{},
+		Target: &compileopts.TargetSpec{
+			Triple:    "armv7m-none-eabi",
+			BuildTags: []string{"cortexm", "baremetal", "linux", "arm"},
+			Scheduler: "tasks",
+		},
+	}
+	machine, err := NewTargetMachine(&config)
+	if err != nil {
+		t.Fatal(err)
+	}
+	c := newCompilerContext("main", machine, &config)
+	c.runtimePkg = types.NewPackage("runtime", "runtime")
+	c.taskPkg = types.NewPackage("internal/task", "task")
+	irbuilder := c.ctx.NewBuilder()
+	defer irbuilder.Dispose()
+
+	// Create LLVM IR from the Go SSA.
+	c.createPackage(pkg, irbuilder)
+
+	// Check the IR with the LLVM verifier.
+	if err := llvm.VerifyModule(c.mod, llvm.PrintMessageAction); err != nil {
+		t.Error("verification error after IR construction")
+	}
+
+	// Check the IR with our own verifier (which checks for different things).
+	errs := ircheck.Module(c.mod)
+	for _, err := range errs {
+		t.Error(err)
+	}
+
+	// Check whether the IR matches the expected IR.
+	ir := c.mod.String()
+	ir = ir[strings.Index(ir, "\ntarget datalayout = ")+1:]
+	outfile := filepath.Join("testdata", name+".ll")
+	if *flagUpdate {
+		err := ioutil.WriteFile(outfile, []byte(ir), 0666)
+		if err != nil {
+			t.Error("could not read output file:", err)
+		}
+	} else {
+		ir2, err := ioutil.ReadFile(outfile)
+		if err != nil {
+			t.Fatal("could not read input file:", err)
+		}
+		ir2 = bytes.Replace(ir2, []byte("\r\n"), []byte("\n"), -1)
+		if ir != string(ir2) {
+			t.Error("output did not match")
+		}
+	}
+}
+
+// simpleImporter implements the types.Importer interface, but only allows
+// importing the unsafe package.
+type simpleImporter struct {
+}
+
+// Import implements the Importer interface. For testing usage only: it only
+// supports importing the unsafe package.
+func (i simpleImporter) Import(path string) (*types.Package, error) {
+	switch path {
+	case "unsafe":
+		return types.Unsafe, nil
+	default:
+		return nil, fmt.Errorf("importer not implemented for package %s", path)
+	}
+}
@@ -15,8 +15,6 @@ package compiler

 import (
 	"github.com/tinygo-org/tinygo/compiler/llvmutil"
-	"github.com/tinygo-org/tinygo/ir"
-	"go/types"
 	"golang.org/x/tools/go/ssa"
 	"tinygo.org/x/go-llvm"
 )
@@ -26,11 +24,9 @@ import (
 // calls.
 func (b *builder) deferInitFunc() {
 	// Some setup.
-	b.deferFuncs = make(map[*ir.Function]int)
+	b.deferFuncs = make(map[*ssa.Function]int)
 	b.deferInvokeFuncs = make(map[string]int)
-	b.deferClosureFuncs = make(map[*ir.Function]int)
-	b.deferExprFuncs = make(map[ssa.Value]int)
-	b.deferBuiltinFuncs = make(map[ssa.Value]deferBuiltin)
+	b.deferClosureFuncs = make(map[*ssa.Function]int)

 	// Create defer list pointer.
 	deferType := llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)
@@ -107,13 +103,12 @@ func (b *builder) createDefer(instr *ssa.Defer) {

 	} else if callee, ok := instr.Call.Value.(*ssa.Function); ok {
 		// Regular function call.
-		fn := b.ir.GetFunction(callee)

-		if _, ok := b.deferFuncs[fn]; !ok {
-			b.deferFuncs[fn] = len(b.allDeferFuncs)
-			b.allDeferFuncs = append(b.allDeferFuncs, fn)
+		if _, ok := b.deferFuncs[callee]; !ok {
+			b.deferFuncs[callee] = len(b.allDeferFuncs)
+			b.allDeferFuncs = append(b.allDeferFuncs, callee)
 		}
-		callback := llvm.ConstInt(b.uintptrType, uint64(b.deferFuncs[fn]), false)
+		callback := llvm.ConstInt(b.uintptrType, uint64(b.deferFuncs[callee]), false)

 		// Collect all values to be put in the struct (starting with
 		// runtime._defer fields).
@@ -135,7 +130,7 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		context := b.CreateExtractValue(closure, 0, "")

 		// Get the callback number.
-		fn := b.ir.GetFunction(makeClosure.Fn.(*ssa.Function))
+		fn := makeClosure.Fn.(*ssa.Function)
 		if _, ok := b.deferClosureFuncs[fn]; !ok {
 			b.deferClosureFuncs[fn] = len(b.allDeferFuncs)
 			b.allDeferFuncs = append(b.allDeferFuncs, makeClosure)
@@ -154,54 +149,9 @@ func (b *builder) createDefer(instr *ssa.Defer) {
 		values = append(values, context)
 		valueTypes = append(valueTypes, context.Type())

-	} else if builtin, ok := instr.Call.Value.(*ssa.Builtin); ok {
-		var funcName string
-		switch builtin.Name() {
-		case "close":
-			funcName = "chanClose"
-		default:
-			b.addError(instr.Pos(), "todo: Implement defer for "+builtin.Name())
-			return
-		}
-
-		if _, ok := b.deferBuiltinFuncs[instr.Call.Value]; !ok {
-			b.deferBuiltinFuncs[instr.Call.Value] = deferBuiltin{
-				funcName,
-				len(b.allDeferFuncs),
-			}
-			b.allDeferFuncs = append(b.allDeferFuncs, instr.Call.Value)
-		}
-		callback := llvm.ConstInt(b.uintptrType, uint64(b.deferBuiltinFuncs[instr.Call.Value].callback), false)
-
-		// Collect all values to be put in the struct (starting with
-		// runtime._defer fields).
-		values = []llvm.Value{callback, next}
-		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param)
-			values = append(values, llvmParam)
-			valueTypes = append(valueTypes, llvmParam.Type())
-		}
-
 	} else {
-		funcValue := b.getValue(instr.Call.Value)
-
-		if _, ok := b.deferExprFuncs[instr.Call.Value]; !ok {
-			b.deferExprFuncs[instr.Call.Value] = len(b.allDeferFuncs)
-			b.allDeferFuncs = append(b.allDeferFuncs, &instr.Call)
-		}
-
-		callback := llvm.ConstInt(b.uintptrType, uint64(b.deferExprFuncs[instr.Call.Value]), false)
-
-		// Collect all values to be put in the struct (starting with
-		// runtime._defer fields, followed by all parameters including the
-		// context pointer).
-		values = []llvm.Value{callback, next, funcValue}
-		valueTypes = append(valueTypes, funcValue.Type())
-		for _, param := range instr.Call.Args {
-			llvmParam := b.getValue(param)
-			values = append(values, llvmParam)
-			valueTypes = append(valueTypes, llvmParam.Type())
-		}
+		b.addError(instr.Pos(), "todo: defer on uncommon function call type")
+		return
 	}

 	// Make a struct out of the collected values to put in the defer frame.
@@ -251,10 +201,10 @@ func (b *builder) createRunDefers() {
 	//     }

 	// Create loop.
-	loophead := b.ctx.AddBasicBlock(b.fn.LLVMFn, "rundefers.loophead")
-	loop := b.ctx.AddBasicBlock(b.fn.LLVMFn, "rundefers.loop")
-	unreachable := b.ctx.AddBasicBlock(b.fn.LLVMFn, "rundefers.default")
-	end := b.ctx.AddBasicBlock(b.fn.LLVMFn, "rundefers.end")
+	loophead := b.ctx.AddBasicBlock(b.llvmFn, "rundefers.loophead")
+	loop := b.ctx.AddBasicBlock(b.llvmFn, "rundefers.loop")
+	unreachable := b.ctx.AddBasicBlock(b.llvmFn, "rundefers.default")
+	end := b.ctx.AddBasicBlock(b.llvmFn, "rundefers.end")
 	b.CreateBr(loophead)

 	// Create loop head:
@@ -286,28 +236,21 @@ func (b *builder) createRunDefers() {
 		// Create switch case, for example:
 		//     case 0:
 		//         // run first deferred call
-		block := b.ctx.AddBasicBlock(b.fn.LLVMFn, "rundefers.callback")
+		block := b.ctx.AddBasicBlock(b.llvmFn, "rundefers.callback")
 		sw.AddCase(llvm.ConstInt(b.uintptrType, uint64(i), false), block)
 		b.SetInsertPointAtEnd(block)
 		switch callback := callback.(type) {
 		case *ssa.CallCommon:
-			// 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)}
-
+			// Call on an interface value.
 			if !callback.IsInvoke() {
-				//Expect funcValue to be passed through the defer frame.
-				valueTypes = append(valueTypes, b.getFuncType(callback.Signature()))
-			} else {
-				//Expect typecode
-				valueTypes = append(valueTypes, b.uintptrType, b.i8ptrType)
+				panic("expected an invoke call, not a direct call")
 			}

+			// Get the real defer struct type and cast to it.
+			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0), b.uintptrType, b.i8ptrType}
 			for _, arg := range callback.Args {
 				valueTypes = append(valueTypes, b.getLLVMType(arg.Type()))
 			}
-
 			deferFrameType := b.ctx.StructType(valueTypes, false)
 			deferFramePtr := b.CreateBitCast(deferData, llvm.PointerType(deferFrameType, 0), "deferFrame")

@@ -320,37 +263,21 @@ func (b *builder) createRunDefers() {
 				forwardParams = append(forwardParams, forwardParam)
 			}

-			var fnPtr llvm.Value
+			// Isolate the typecode.
+			typecode, forwardParams := forwardParams[0], forwardParams[1:]

-			if !callback.IsInvoke() {
-				// Isolate the func value.
-				funcValue := forwardParams[0]
-				forwardParams = forwardParams[1:]
-
-				//Get function pointer and context
-				fp, context := b.decodeFuncValue(funcValue, callback.Signature())
-				fnPtr = fp
-
-				//Pass context
-				forwardParams = append(forwardParams, context)
-			} else {
-				// Isolate the typecode.
-				typecode := forwardParams[0]
-				forwardParams = forwardParams[1:]
-				fnPtr = b.getInvokePtr(callback, typecode)
-
-				// 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))
-			}
+			// 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))

 			// Parent coroutine handle.
 			forwardParams = append(forwardParams, llvm.Undef(b.i8ptrType))

+			fnPtr := b.getInvokePtr(callback, typecode)
 			b.createCall(fnPtr, forwardParams, "")

-		case *ir.Function:
+		case *ssa.Function:
 			// Direct call.

 			// Get the real defer struct type and cast to it.
@@ -372,7 +299,7 @@ func (b *builder) createRunDefers() {

 			// Plain TinyGo functions add some extra parameters to implement async functionality and function recievers.
 			// These parameters should not be supplied when calling into an external C/ASM function.
-			if !callback.IsExported() {
+			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))
@@ -382,11 +309,11 @@ func (b *builder) createRunDefers() {
 			}

 			// Call real function.
-			b.createCall(callback.LLVMFn, forwardParams, "")
+			b.createCall(b.getFunction(callback), forwardParams, "")

 		case *ssa.MakeClosure:
 			// Get the real defer struct type and cast to it.
-			fn := b.ir.GetFunction(callback.Fn.(*ssa.Function))
+			fn := callback.Fn.(*ssa.Function)
 			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
 			params := fn.Signature.Params()
 			for i := 0; i < params.Len(); i++ {
@@ -409,32 +336,8 @@ func (b *builder) createRunDefers() {
 			forwardParams = append(forwardParams, llvm.Undef(b.i8ptrType))

 			// Call deferred function.
-			b.createCall(fn.LLVMFn, forwardParams, "")
-		case *ssa.Builtin:
-			db := b.deferBuiltinFuncs[callback]
+			b.createCall(b.getFunction(fn), forwardParams, "")

-			//Get parameter types
-			valueTypes := []llvm.Type{b.uintptrType, llvm.PointerType(b.getLLVMRuntimeType("_defer"), 0)}
-
-			//Get signature from call results
-			params := callback.Type().Underlying().(*types.Signature).Params()
-			for i := 0; i < params.Len(); i++ {
-				valueTypes = append(valueTypes, b.getLLVMType(params.At(i).Type()))
-			}
-
-			deferFrameType := b.ctx.StructType(valueTypes, false)
-			deferFramePtr := b.CreateBitCast(deferData, llvm.PointerType(deferFrameType, 0), "deferFrame")
-
-			// Extract the params from the struct.
-			var forwardParams []llvm.Value
-			zero := llvm.ConstInt(b.ctx.Int32Type(), 0, false)
-			for i := 0; i < params.Len(); i++ {
-				gep := b.CreateInBoundsGEP(deferFramePtr, []llvm.Value{zero, llvm.ConstInt(b.ctx.Int32Type(), uint64(i+2), false)}, "gep")
-				forwardParam := b.CreateLoad(gep, "param")
-				forwardParams = append(forwardParams, forwardParam)
-			}
-
-			b.createRuntimeCall(db.funcName, forwardParams, "")
 		default:
 			panic("unknown deferred function type")
 		}
@@ -14,7 +14,7 @@ import (
 // makeError makes it easy to create an error from a token.Pos with a message.
 func (c *compilerContext) makeError(pos token.Pos, msg string) types.Error {
 	return types.Error{
-		Fset: c.ir.Program.Fset,
+		Fset: c.program.Fset,
 		Pos:  pos,
 		Msg:  msg,
 	}
@@ -5,6 +5,7 @@ package compiler

 import (
 	"go/types"
+	"strings"

 	"github.com/tinygo-org/tinygo/compileopts"
 	"golang.org/x/tools/go/ssa"
@@ -149,7 +150,16 @@ func (b *builder) parseMakeClosure(expr *ssa.MakeClosure) (llvm.Value, error) {
 	if len(expr.Bindings) == 0 {
 		panic("unexpected: MakeClosure without bound variables")
 	}
-	f := b.ir.GetFunction(expr.Fn.(*ssa.Function))
+	f := expr.Fn.(*ssa.Function)
+	llvmFn := b.getFunction(f)
+
+	if strings.HasSuffix(f.Name(), "$bound") && llvmFn.IsDeclaration() {
+		// Hack: the ssa package does not expose bound methods so make sure
+		// they're built here when necessary.
+		irbuilder := b.ctx.NewBuilder()
+		defer irbuilder.Dispose()
+		b.createFunction(irbuilder, f, llvmFn)
+	}

 	// Collect all bound variables.
 	boundVars := make([]llvm.Value, len(expr.Bindings))
@@ -164,5 +174,5 @@ func (b *builder) parseMakeClosure(expr *ssa.MakeClosure) (llvm.Value, error) {
 	context := b.emitPointerPack(boundVars)

 	// Create the closure.
-	return b.createFuncValue(f.LLVMFn, context, f.Signature), nil
+	return b.createFuncValue(llvmFn, context, f.Signature), nil
 }
@@ -7,6 +7,7 @@ import (
 	"go/token"

 	"github.com/tinygo-org/tinygo/compiler/llvmutil"
+	"golang.org/x/tools/go/ssa"
 	"tinygo.org/x/go-llvm"
 )

@@ -19,30 +20,17 @@ import (
 // Because a go statement doesn't return anything, return undef.
 func (b *builder) createGoInstruction(funcPtr llvm.Value, params []llvm.Value, prefix string, pos token.Pos) llvm.Value {
 	paramBundle := b.emitPointerPack(params)
-	var callee, stackSize llvm.Value
+	var callee llvm.Value
 	switch b.Scheduler() {
 	case "none", "tasks":
 		callee = b.createGoroutineStartWrapper(funcPtr, prefix, 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).
-			stackSize = b.createCall(b.mod.NamedFunction("internal/task.getGoroutineStackSize"), []llvm.Value{callee, llvm.Undef(b.i8ptrType), llvm.Undef(b.i8ptrType)}, "stacksize")
-		} else {
-			// The stack size is fixed at compile time. By emitting it here as a
-			// constant, it can be optimized.
-			stackSize = llvm.ConstInt(b.uintptrType, b.Target.DefaultStackSize, false)
-		}
 	case "coroutines":
 		callee = b.CreatePtrToInt(funcPtr, b.uintptrType, "")
-		// There is no goroutine stack size: coroutines are used instead of
-		// stacks.
-		stackSize = llvm.Undef(b.uintptrType)
 	default:
 		panic("unreachable")
 	}
-	b.createCall(b.mod.NamedFunction("internal/task.start"), []llvm.Value{callee, paramBundle, stackSize, llvm.Undef(b.i8ptrType), llvm.ConstPointerNull(b.i8ptrType)}, "")
+	start := b.getFunction(b.program.ImportedPackage("internal/task").Members["start"].(*ssa.Function))
+	b.createCall(start, []llvm.Value{callee, paramBundle, llvm.Undef(b.i8ptrType), llvm.ConstPointerNull(b.i8ptrType)}, "")
 	return llvm.Undef(funcPtr.Type().ElementType().ReturnType())
 }

@@ -81,14 +69,13 @@ func (c *compilerContext) createGoroutineStartWrapper(fn llvm.Value, prefix stri
 		// Create the wrapper.
 		wrapperType := llvm.FunctionType(c.ctx.VoidType(), []llvm.Type{c.i8ptrType}, false)
 		wrapper = llvm.AddFunction(c.mod, name+"$gowrapper", wrapperType)
-		wrapper.SetLinkage(llvm.InternalLinkage)
+		wrapper.SetLinkage(llvm.PrivateLinkage)
 		wrapper.SetUnnamedAddr(true)
-		wrapper.AddAttributeAtIndex(-1, c.ctx.CreateStringAttribute("tinygo-gowrapper", name))
 		entry := c.ctx.AddBasicBlock(wrapper, "entry")
 		builder.SetInsertPointAtEnd(entry)

 		if c.Debug() {
-			pos := c.ir.Program.Fset.Position(pos)
+			pos := c.program.Fset.Position(pos)
 			diFuncType := c.dibuilder.CreateSubroutineType(llvm.DISubroutineType{
 				File:       c.getDIFile(pos.Filename),
 				Parameters: nil, // do not show parameters in debugger
@@ -140,12 +127,11 @@ func (c *compilerContext) createGoroutineStartWrapper(fn llvm.Value, prefix stri
 		wrapper = llvm.AddFunction(c.mod, prefix+".gowrapper", wrapperType)
 		wrapper.SetLinkage(llvm.InternalLinkage)
 		wrapper.SetUnnamedAddr(true)
-		wrapper.AddAttributeAtIndex(-1, c.ctx.CreateStringAttribute("tinygo-gowrapper", ""))
 		entry := c.ctx.AddBasicBlock(wrapper, "entry")
 		builder.SetInsertPointAtEnd(entry)

 		if c.Debug() {
-			pos := c.ir.Program.Fset.Position(pos)
+			pos := c.program.Fset.Position(pos)
 			diFuncType := c.dibuilder.CreateSubroutineType(llvm.DISubroutineType{
 				File:       c.getDIFile(pos.Filename),
 				Parameters: nil, // do not show parameters in debugger
@@ -163,44 +163,6 @@ func (b *builder) emitSVCall(args []ssa.Value) (llvm.Value, error) {
 	return b.CreateCall(target, llvmArgs, ""), nil
 }

-// This is a compiler builtin which emits an inline SVCall instruction. It can
-// be one of:
-//
-//     func SVCall0(num uintptr) uintptr
-//     func SVCall1(num uintptr, a1 interface{}) uintptr
-//     func SVCall2(num uintptr, a1, a2 interface{}) uintptr
-//     func SVCall3(num uintptr, a1, a2, a3 interface{}) uintptr
-//     func SVCall4(num uintptr, a1, a2, a3, a4 interface{}) uintptr
-//
-// The num parameter must be a constant. All other parameters may be any scalar
-// value supported by LLVM inline assembly.
-// Same as emitSVCall but for AArch64
-func (b *builder) emitSV64Call(args []ssa.Value) (llvm.Value, error) {
-	num, _ := constant.Uint64Val(args[0].(*ssa.Const).Value)
-	llvmArgs := []llvm.Value{}
-	argTypes := []llvm.Type{}
-	asm := "svc #" + strconv.FormatUint(num, 10)
-	constraints := "={x0}"
-	for i, arg := range args[1:] {
-		arg = arg.(*ssa.MakeInterface).X
-		if i == 0 {
-			constraints += ",0"
-		} else {
-			constraints += ",{x" + strconv.Itoa(i) + "}"
-		}
-		llvmValue := b.getValue(arg)
-		llvmArgs = append(llvmArgs, llvmValue)
-		argTypes = append(argTypes, llvmValue.Type())
-	}
-	// Implement the ARM64 calling convention by marking x1-x7 as
-	// clobbered. x0 is used as an output register so doesn't have to be
-	// marked as clobbered.
-	constraints += ",~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7}"
-	fnType := llvm.FunctionType(b.uintptrType, argTypes, false)
-	target := llvm.InlineAsm(fnType, asm, constraints, true, false, 0)
-	return b.CreateCall(target, llvmArgs, ""), nil
-}
-
 // This is a compiler builtin which emits CSR instructions. It can be one of:
 //
 //     func (csr CSR) Get() uintptr
@@ -11,7 +11,6 @@ import (
 	"strconv"
 	"strings"

-	"github.com/tinygo-org/tinygo/ir"
 	"golang.org/x/tools/go/ssa"
 	"tinygo.org/x/go-llvm"
 )
@@ -236,7 +235,7 @@ func (c *compilerContext) getTypeMethodSet(typ types.Type) llvm.Value {
 		return llvm.ConstGEP(global, []llvm.Value{zero, zero})
 	}

-	ms := c.ir.Program.MethodSets.MethodSet(typ)
+	ms := c.program.MethodSets.MethodSet(typ)
 	if ms.Len() == 0 {
 		// no methods, so can leave that one out
 		return llvm.ConstPointerNull(llvm.PointerType(c.getLLVMRuntimeType("interfaceMethodInfo"), 0))
@@ -247,15 +246,23 @@ func (c *compilerContext) getTypeMethodSet(typ types.Type) llvm.Value {
 	for i := 0; i < ms.Len(); i++ {
 		method := ms.At(i)
 		signatureGlobal := c.getMethodSignature(method.Obj().(*types.Func))
-		f := c.ir.GetFunction(c.ir.Program.MethodValue(method))
-		if f.LLVMFn.IsNil() {
+		fn := c.program.MethodValue(method)
+		llvmFn := c.getFunction(fn)
+		if llvmFn.IsNil() {
 			// compiler error, so panic
-			panic("cannot find function: " + f.LinkName())
+			panic("cannot find function: " + c.getFunctionInfo(fn).linkName)
 		}
-		fn := c.getInterfaceInvokeWrapper(f)
+		if isAnonymous(typ) && llvmFn.IsDeclaration() {
+			// Inline types may also have methods when they embed interface
+			// types with methods. Example: struct{ error }
+			irbuilder := c.ctx.NewBuilder()
+			defer irbuilder.Dispose()
+			c.createFunction(irbuilder, fn, llvmFn)
+		}
+		wrapper := c.getInterfaceInvokeWrapper(fn, llvmFn)
 		methodInfo := llvm.ConstNamedStruct(interfaceMethodInfoType, []llvm.Value{
 			signatureGlobal,
-			llvm.ConstPtrToInt(fn, c.uintptrType),
+			llvm.ConstPtrToInt(wrapper, c.uintptrType),
 		})
 		methods[i] = methodInfo
 	}
@@ -303,7 +310,7 @@ func (c *compilerContext) getInterfaceMethodSet(typ types.Type) llvm.Value {
 // external *i8 indicating the indicating the signature of this method. It is
 // used during the interface lowering pass.
 func (c *compilerContext) getMethodSignature(method *types.Func) llvm.Value {
-	signature := ir.MethodSignature(method)
+	signature := methodSignature(method)
 	signatureGlobal := c.mod.NamedGlobal("func " + signature)
 	if signatureGlobal.IsNil() {
 		signatureGlobal = llvm.AddGlobal(c.mod, c.ctx.Int8Type(), "func "+signature)
@@ -357,8 +364,8 @@ func (b *builder) createTypeAssert(expr *ssa.TypeAssert) llvm.Value {
 	// value.

 	prevBlock := b.GetInsertBlock()
-	okBlock := b.ctx.AddBasicBlock(b.fn.LLVMFn, "typeassert.ok")
-	nextBlock := b.ctx.AddBasicBlock(b.fn.LLVMFn, "typeassert.next")
+	okBlock := b.ctx.AddBasicBlock(b.llvmFn, "typeassert.ok")
+	nextBlock := b.ctx.AddBasicBlock(b.llvmFn, "typeassert.next")
 	b.blockExits[b.currentBlock] = nextBlock // adjust outgoing block for phi nodes
 	b.CreateCondBr(commaOk, okBlock, nextBlock)

@@ -436,8 +443,8 @@ func (b *builder) getInvokeCall(instr *ssa.CallCommon) (llvm.Value, []llvm.Value
 // value, dereferences or unpacks it if necessary, and calls the real method.
 // If the method to wrap has a pointer receiver, no wrapping is necessary and
 // the function is returned directly.
-func (c *compilerContext) getInterfaceInvokeWrapper(f *ir.Function) llvm.Value {
-	wrapperName := f.LinkName() + "$invoke"
+func (c *compilerContext) getInterfaceInvokeWrapper(fn *ssa.Function, llvmFn llvm.Value) llvm.Value {
+	wrapperName := llvmFn.Name() + "$invoke"
 	wrapper := c.mod.NamedFunction(wrapperName)
 	if !wrapper.IsNil() {
 		// Wrapper already created. Return it directly.
@@ -445,7 +452,7 @@ func (c *compilerContext) getInterfaceInvokeWrapper(f *ir.Function) llvm.Value {
 	}

 	// Get the expanded receiver type.
-	receiverType := c.getLLVMType(f.Params[0].Type())
+	receiverType := c.getLLVMType(fn.Params[0].Type())
 	var expandedReceiverType []llvm.Type
 	for _, info := range expandFormalParamType(receiverType, "", nil) {
 		expandedReceiverType = append(expandedReceiverType, info.llvmType)
@@ -457,15 +464,15 @@ func (c *compilerContext) getInterfaceInvokeWrapper(f *ir.Function) llvm.Value {
 		// Casting a function signature to a different signature and calling it
 		// with a receiver pointer bitcasted to *i8 (as done in calls on an
 		// interface) is hopefully a safe (defined) operation.
-		return f.LLVMFn
+		return llvmFn
 	}

 	// create wrapper function
-	fnType := f.LLVMFn.Type().ElementType()
+	fnType := llvmFn.Type().ElementType()
 	paramTypes := append([]llvm.Type{c.i8ptrType}, fnType.ParamTypes()[len(expandedReceiverType):]...)
 	wrapFnType := llvm.FunctionType(fnType.ReturnType(), paramTypes, false)
 	wrapper = llvm.AddFunction(c.mod, wrapperName, wrapFnType)
-	if f.LLVMFn.LastParam().Name() == "parentHandle" {
+	if llvmFn.LastParam().Name() == "parentHandle" {
 		wrapper.LastParam().SetName("parentHandle")
 	}

@@ -481,8 +488,8 @@ func (c *compilerContext) getInterfaceInvokeWrapper(f *ir.Function) llvm.Value {

 	// add debug info if needed
 	if c.Debug() {
-		pos := c.ir.Program.Fset.Position(f.Pos())
-		difunc := c.attachDebugInfoRaw(f, wrapper, "$invoke", pos.Filename, pos.Line)
+		pos := c.program.Fset.Position(fn.Pos())
+		difunc := c.attachDebugInfoRaw(fn, wrapper, "$invoke", pos.Filename, pos.Line)
 		b.SetCurrentDebugLocation(uint(pos.Line), uint(pos.Column), difunc, llvm.Metadata{})
 	}

@@ -492,13 +499,72 @@ func (c *compilerContext) getInterfaceInvokeWrapper(f *ir.Function) llvm.Value {

 	receiverValue := b.emitPointerUnpack(wrapper.Param(0), []llvm.Type{receiverType})[0]
 	params := append(b.expandFormalParam(receiverValue), wrapper.Params()[1:]...)
-	if f.LLVMFn.Type().ElementType().ReturnType().TypeKind() == llvm.VoidTypeKind {
-		b.CreateCall(f.LLVMFn, params, "")
+	if llvmFn.Type().ElementType().ReturnType().TypeKind() == llvm.VoidTypeKind {
+		b.CreateCall(llvmFn, params, "")
 		b.CreateRetVoid()
 	} else {
-		ret := b.CreateCall(f.LLVMFn, params, "ret")
+		ret := b.CreateCall(llvmFn, params, "ret")
 		b.CreateRet(ret)
 	}

 	return wrapper
 }
+
+// isAnonymous returns true if (and only if) this is an anonymous type: one that
+// is created inline. It can have methods if it embeds a type with methods.
+func isAnonymous(typ types.Type) bool {
+	if t, ok := typ.(*types.Pointer); ok {
+		typ = t.Elem()
+	}
+	if _, ok := typ.(*types.Named); !ok {
+		return true
+	}
+	return false
+}
+
+// methodSignature creates a readable version of a method signature (including
+// the function name, excluding the receiver name). This string is used
+// internally to match interfaces and to call the correct method on an
+// interface. Examples:
+//
+//     String() string
+//     Read([]byte) (int, error)
+func methodSignature(method *types.Func) string {
+	return method.Name() + signature(method.Type().(*types.Signature))
+}
+
+// Make a readable version of a function (pointer) signature.
+// Examples:
+//
+//     () string
+//     (string, int) (int, error)
+func signature(sig *types.Signature) string {
+	s := ""
+	if sig.Params().Len() == 0 {
+		s += "()"
+	} else {
+		s += "("
+		for i := 0; i < sig.Params().Len(); i++ {
+			if i > 0 {
+				s += ", "
+			}
+			s += sig.Params().At(i).Type().String()
+		}
+		s += ")"
+	}
+	if sig.Results().Len() == 0 {
+		// keep as-is
+	} else if sig.Results().Len() == 1 {
+		s += " " + sig.Results().At(0).Type().String()
+	} else {
+		s += " ("
+		for i := 0; i < sig.Results().Len(); i++ {
+			if i > 0 {
+				s += ", "
+			}
+			s += sig.Results().At(i).Type().String()
+		}
+		s += ")"
+	}
+	return s
+}
@@ -39,7 +39,7 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro

 	// Create a new global of type runtime/interrupt.handle. Globals of this
 	// type are lowered in the interrupt lowering pass.
-	globalType := b.ir.Program.ImportedPackage("runtime/interrupt").Type("handle").Type()
+	globalType := b.program.ImportedPackage("runtime/interrupt").Type("handle").Type()
 	globalLLVMType := b.getLLVMType(globalType)
 	globalName := "runtime/interrupt.$interrupt" + strconv.FormatInt(id.Int64(), 10)
 	if global := b.mod.NamedGlobal(globalName); !global.IsNil() {
@@ -56,7 +56,7 @@ func (b *builder) createInterruptGlobal(instr *ssa.CallCommon) (llvm.Value, erro

 	// Add debug info to the interrupt global.
 	if b.Debug() {
-		pos := b.ir.Program.Fset.Position(instr.Pos())
+		pos := b.program.Fset.Position(instr.Pos())
 		diglobal := b.dibuilder.CreateGlobalVariableExpression(b.getDIFile(pos.Filename), llvm.DIGlobalVariableExpression{
 			Name:        "interrupt" + strconv.FormatInt(id.Int64(), 10),
 			LinkageName: globalName,
@@ -0,0 +1,344 @@
+// +build none
+
+// This file generates runtimetypes.go from the AST of the TinyGo runtime
+// package. This type information is necessary to avoid having to compile the
+// runtime to compile any package.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/ast"
+	"go/format"
+	"go/token"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"golang.org/x/tools/go/packages"
+)
+
+// The list of runtime types known by the compiler.
+var runtimeTypes = []string{
+	// panic, recover
+	"_defer",
+	// strings
+	"_string", "stringIterator",
+	// map
+	"hashmap", "hashmapBucket", "hashmapIterator",
+	// channel
+	"channel", "channelBlockedList", "chanSelectState",
+	// interface
+	"_interface", "interfaceMethodInfo", "typecodeID", "structField", "typeInInterface",
+	// func
+	"funcValue", "funcValueWithSignature",
+}
+
+// The list of runtime calls known to the compiler.
+var runtimeCalls = []string{
+	// panic, recover
+	"_panic", "_recover",
+	"nilPanic", "lookupPanic", "slicePanic", "chanMakePanic", "negativeShiftPanic",
+	// string
+	"stringEqual", "stringLess",
+	"stringConcat",
+	"stringFromBytes", "stringToBytes",
+	"stringFromRunes", "stringToRunes",
+	"stringFromUnicode",
+	"stringNext",
+	// complex
+	"complex64div", "complex128div",
+	// slice
+	"sliceAppend", "sliceCopy",
+	// memory
+	"alloc", "trackPointer",
+	// print builtin
+	"printbool",
+	"printint8", "printuint8",
+	"printint16", "printuint16",
+	"printint32", "printuint32",
+	"printint64", "printuint64",
+	"printfloat32", "printfloat64",
+	"printcomplex64", "printcomplex128",
+	"printstring", "printspace", "printnl",
+	"printptr", "printmap", "printitf",
+	// hashmap
+	"hashmapMake", "hashmapLen", "hashmapNext",
+	"hashmapStringGet", "hashmapStringSet", "hashmapStringDelete",
+	"hashmapInterfaceGet", "hashmapInterfaceSet", "hashmapInterfaceDelete",
+	"hashmapBinaryGet", "hashmapBinarySet", "hashmapBinaryDelete",
+	// channel, concurrency
+	"tryChanSelect", "chanMake", "chanSend", "chanRecv", "chanClose", "chanSelect",
+	"deadlock",
+	// interface, reflect
+	"interfaceEqual", "interfaceImplements", "interfaceMethod",
+	"typeAssert", "interfaceTypeAssert",
+	// func
+	"getFuncPtr",
+}
+
+// makeDefs generates runtimetypes.go and writes it out after formatting it.
+func makeDefs() error {
+	// Load the runtime package.
+	pkgs, err := packages.Load(&packages.Config{
+		Mode:       packages.NeedSyntax,
+		BuildFlags: []string{"-tags=gc.extalloc"},
+	}, "../src/runtime")
+	if err != nil {
+		return err
+	}
+	if len(pkgs) != 1 {
+		return fmt.Errorf("expected 1 package, got %d", len(pkgs))
+	}
+	runtimePkg := pkgs[0]
+	if len(runtimePkg.Errors) != 0 {
+		return runtimePkg.Errors[0]
+	}
+
+	// Start creating the new Go file.
+	buf := &bytes.Buffer{}
+	buf.WriteString(`// Autogenerated by mkruntimetypes.go, DO NOT EDIT.
+
+package compiler
+
+// This file contains definitions for runtime types and functions, so that the
+// runtime package can be compiled independently of other packages.
+
+import (
+	"go/token"
+	"go/types"
+	"strconv"
+)
+
+// getRuntimeType constructs a new runtime type with the given name. The types
+// constructed here must match the types in the runtime package.
+func (c *compilerContext) getRuntimeType(name string) types.Type {
+	if c.program != nil {
+		return c.program.ImportedPackage("runtime").Type(name).Type()
+	}
+	if typ, ok := c.runtimeTypes[name]; ok {
+		// This type was already created.
+		return typ
+	}
+
+	typeName := types.NewTypeName(token.NoPos, c.runtimePkg, name, nil)
+	named := types.NewNamed(typeName, nil, nil)
+
+	// Make sure recursive types are only defined once.
+	c.runtimeTypes[name] = named
+
+	var fieldTypes []types.Type
+	switch name {
+`)
+	err = makeTypeDefs(buf, runtimePkg)
+	if err != nil {
+		return err
+	}
+	buf.WriteString(`		default:
+		panic("could not find runtime type: runtime." + name)
+	}
+
+	// Create the named struct type.
+	var fields []*types.Var
+	for i, t := range fieldTypes {
+		// Field name doesn't matter: this type is only used to create a LLVM
+		// struct type which don't have field names.
+		fields = append(fields, types.NewField(token.NoPos, nil, "field"+strconv.Itoa(i), t, false))
+	}
+	named.SetUnderlying(types.NewStruct(fields, nil))
+	return named
+}
+
+// getRuntimeFuncType constructs a new runtime function signature with the given
+// name. The function signatures constructed here must match the functions in
+// the runtime package.
+func (c *compilerContext) getRuntimeFuncType(name string) *types.Signature {
+	var params []*types.Var
+	addParam := func(name string, typ types.Type) {
+		params = append(params, types.NewParam(token.NoPos, c.runtimePkg, name, typ))
+	}
+	var results []*types.Var
+	addResult := func(typ types.Type) {
+		results = append(results, types.NewParam(token.NoPos, c.runtimePkg, "", typ))
+	}
+	switch name {
+`)
+
+	err = makeFuncDefs(buf, runtimePkg)
+	if err != nil {
+		return err
+	}
+	buf.WriteString(`	default:
+		panic("unknown runtime call: runtime." + name)
+	}
+	return types.NewSignature(nil, types.NewTuple(params...), types.NewTuple(results...), false)
+}
+`)
+
+	source, err := format.Source(buf.Bytes())
+	if err != nil {
+		// Fallback (useful for investigating errors).
+		source = buf.Bytes()
+	}
+	err2 := ioutil.WriteFile("runtimetypes.go", source, 0666)
+	if err2 != nil {
+		return err2 // error from ioutil.WriteFile
+	}
+	return err // error from format.Source (if any)
+}
+
+// makeTypeDefs generates the switch body of the getRuntimeType function.
+func makeTypeDefs(w io.Writer, runtimePkg *packages.Package) error {
+	typeSpecs := map[string]*ast.TypeSpec{}
+	for _, file := range runtimePkg.Syntax {
+		for _, decl := range file.Decls {
+			switch decl := decl.(type) {
+			case *ast.GenDecl:
+				if decl.Tok != token.TYPE {
+					continue
+				}
+				for _, spec := range decl.Specs {
+					typeSpec := spec.(*ast.TypeSpec)
+					typeSpecs[typeSpec.Name.Name] = typeSpec
+				}
+			}
+		}
+	}
+
+	for _, name := range runtimeTypes {
+		typeSpec := typeSpecs[name]
+		if typeSpec == nil {
+			return fmt.Errorf("could not find type: %s", name)
+		}
+		fmt.Fprintf(w, "\tcase %#v:\n", typeSpec.Name.Name)
+		if name == "channelBlockedList" {
+			fmt.Fprintf(w, "\t\ttaskType := types.NewNamed(types.NewTypeName(token.NoPos, c.taskPkg, \"Task\", nil), nil, nil)\n")
+		}
+		fmt.Fprintf(w, "\t\tfieldTypes = []types.Type{\n")
+		for _, field := range typeSpec.Type.(*ast.StructType).Fields.List {
+			fieldType := getTypeFromExpr(field.Type, typeSpec.Name.Name)
+			for _, ident := range field.Names {
+				fmt.Fprintf(w, "\t\t\t%s, // %s\n", fieldType, ident.Name)
+			}
+		}
+		fmt.Fprintf(w, "\t\t}\n")
+	}
+	return nil
+}
+
+// makeFuncDefs generates the switch body of the getRuntimeFuncType function.
+func makeFuncDefs(w io.Writer, runtimePkg *packages.Package) error {
+	functions := map[string]*ast.FuncDecl{}
+	for _, file := range runtimePkg.Syntax {
+		for _, decl := range file.Decls {
+			switch decl := decl.(type) {
+			case *ast.FuncDecl:
+				functions[decl.Name.Name] = decl
+			default:
+			}
+		}
+	}
+
+	for _, name := range runtimeCalls {
+		decl := functions[name]
+		if decl == nil {
+			return fmt.Errorf("could not find function: %s", name)
+		}
+		fmt.Fprintf(w, "\tcase %#v:\n", decl.Name.Name)
+		for _, field := range decl.Type.Params.List {
+			typeString := getTypeFromExpr(field.Type, "")
+			for _, name := range field.Names {
+				fmt.Fprintf(w, "\t\taddParam(%#v, %s)\n", name.Name, typeString)
+			}
+		}
+		if decl.Type.Results != nil {
+			for _, field := range decl.Type.Results.List {
+				typeString := getTypeFromExpr(field.Type, "")
+				for range field.Names {
+					fmt.Fprintf(w, "\t\taddResult(%s)\n", typeString)
+				}
+				if len(field.Names) == 0 {
+					fmt.Fprintf(w, "\t\taddResult(%s)\n", typeString)
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// getTypeFromExpr returns a string which is a piece of Go code that constructs
+// the type (as given in ast.Expr) using the go/types package.
+func getTypeFromExpr(typ ast.Expr, currentTypeName string) string {
+	switch typ := typ.(type) {
+	case *ast.Ident:
+		if typ.Name == currentTypeName {
+			// Assume a global named "named" which refers to the currently
+			// created named type.
+			return "named"
+		}
+		switch typ.Name {
+		case "bool", "int", "int8", "int16", "int32", "int64", "uint", "uint8", "uint16", "uint32", "uint64", "uintptr", "float32", "float64", "complex64", "complex128", "string", "byte", "rune":
+			// Built-in types.
+			return fmt.Sprintf("types.Typ[types.%s]", strings.Title(typ.Name))
+		case "chanState":
+			// runtime.chanState is a named type, but that doesn't matter when
+			// generating LLVM IR.
+			return fmt.Sprintf("types.Typ[types.Uint8]")
+		default:
+			// Assume that we can simply get the type recursively.
+			return fmt.Sprintf("c.getRuntimeType(%#v)", typ.Name)
+		}
+	case *ast.StarExpr:
+		return fmt.Sprintf("types.NewPointer(%s)", getTypeFromExpr(typ.X, currentTypeName))
+	case *ast.InterfaceType:
+		if len(typ.Methods.List) != 0 {
+			// Unimplemented: interfaces with methods.
+			return "interface{?}"
+		}
+		return "types.NewInterfaceType(nil, nil)"
+	case *ast.ArrayType:
+		// Slices and arrays. Assume the array length is a numeric constant and
+		// not a Go named constant for example.
+		elementType := getTypeFromExpr(typ.Elt, currentTypeName)
+		if typ.Len == nil {
+			return fmt.Sprintf("types.NewSlice(%s)", elementType)
+		}
+		length := typ.Len.(*ast.BasicLit).Value
+		return fmt.Sprintf("types.NewArray(%s, %s)", elementType, length)
+	case *ast.SelectorExpr:
+		s := typ.X.(*ast.Ident).Name + "." + typ.Sel.Name
+		switch s {
+		case "unsafe.Pointer":
+			return "types.Typ[types.UnsafePointer]"
+		case "task.Task":
+			// Assume there is a variable taskType which refers to the task.Task
+			// structure.
+			return "taskType"
+		default:
+			return fmt.Sprintf("<unknown %s>", s)
+		}
+	case *ast.StructType:
+		// Inline struct type.
+		var fields string
+		for _, field := range typ.Fields.List {
+			fieldType := getTypeFromExpr(field.Type, currentTypeName)
+			for _, ident := range field.Names {
+				fields += fmt.Sprintf("\t\t\ttypes.NewField(token.NoPos, nil, %#v, %s, false),\n", ident.Name, fieldType)
+			}
+		}
+		return fmt.Sprintf("types.NewStruct([]*types.Var{\n%s\t\t}, nil)", fields)
+	default:
+		// Dump the raw typ value, for debugging.
+		return fmt.Sprintf("%#v", typ)
+	}
+}
+
+func main() {
+	err := makeDefs()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "could not create defs:", err)
+		os.Exit(1)
+	}
+}
@@ -0,0 +1,377 @@
+// Autogenerated by mkruntimetypes.go, DO NOT EDIT.
+
+package compiler
+
+// This file contains definitions for runtime types and functions, so that the
+// runtime package can be compiled independently of other packages.
+
+import (
+	"go/token"
+	"go/types"
+	"strconv"
+)
+
+// getRuntimeType constructs a new runtime type with the given name. The types
+// constructed here must match the types in the runtime package.
+func (c *compilerContext) getRuntimeType(name string) types.Type {
+	if c.program != nil {
+		return c.program.ImportedPackage("runtime").Type(name).Type()
+	}
+	if typ, ok := c.runtimeTypes[name]; ok {
+		// This type was already created.
+		return typ
+	}
+
+	typeName := types.NewTypeName(token.NoPos, c.runtimePkg, name, nil)
+	named := types.NewNamed(typeName, nil, nil)
+
+	// Make sure recursive types are only defined once.
+	c.runtimeTypes[name] = named
+
+	var fieldTypes []types.Type
+	switch name {
+	case "_defer":
+		fieldTypes = []types.Type{
+			types.Typ[types.Uintptr], // callback
+			types.NewPointer(named),  // next
+		}
+	case "_string":
+		fieldTypes = []types.Type{
+			types.NewPointer(types.Typ[types.Byte]), // ptr
+			types.Typ[types.Uintptr],                // length
+		}
+	case "stringIterator":
+		fieldTypes = []types.Type{
+			types.Typ[types.Uintptr], // byteindex
+		}
+	case "hashmap":
+		fieldTypes = []types.Type{
+			types.NewPointer(named),        // next
+			types.Typ[types.UnsafePointer], // buckets
+			types.Typ[types.Uintptr],       // count
+			types.Typ[types.Uint8],         // keySize
+			types.Typ[types.Uint8],         // valueSize
+			types.Typ[types.Uint8],         // bucketBits
+		}
+	case "hashmapBucket":
+		fieldTypes = []types.Type{
+			types.NewArray(types.Typ[types.Uint8], 8), // tophash
+			types.NewPointer(named),                   // next
+		}
+	case "hashmapIterator":
+		fieldTypes = []types.Type{
+			types.Typ[types.Uintptr],                            // bucketNumber
+			types.NewPointer(c.getRuntimeType("hashmapBucket")), // bucket
+			types.Typ[types.Uint8],                              // bucketIndex
+		}
+	case "channel":
+		fieldTypes = []types.Type{
+			types.Typ[types.Uintptr],                                 // elementSize
+			types.Typ[types.Uintptr],                                 // bufSize
+			types.Typ[types.Uint8],                                   // state
+			types.NewPointer(c.getRuntimeType("channelBlockedList")), // blocked
+			types.Typ[types.Uintptr],                                 // bufHead
+			types.Typ[types.Uintptr],                                 // bufTail
+			types.Typ[types.Uintptr],                                 // bufUsed
+			types.Typ[types.UnsafePointer],                           // buf
+		}
+	case "channelBlockedList":
+		taskType := types.NewNamed(types.NewTypeName(token.NoPos, c.taskPkg, "Task", nil), nil, nil)
+		fieldTypes = []types.Type{
+			types.NewPointer(named),                               // next
+			types.NewPointer(taskType),                            // t
+			types.NewPointer(c.getRuntimeType("chanSelectState")), // s
+			types.NewSlice(named),                                 // allSelectOps
+		}
+	case "chanSelectState":
+		fieldTypes = []types.Type{
+			types.NewPointer(c.getRuntimeType("channel")), // ch
+			types.Typ[types.UnsafePointer],                // value
+		}
+	case "_interface":
+		fieldTypes = []types.Type{
+			types.Typ[types.Uintptr],       // typecode
+			types.Typ[types.UnsafePointer], // value
+		}
+	case "interfaceMethodInfo":
+		fieldTypes = []types.Type{
+			types.NewPointer(types.Typ[types.Uint8]), // signature
+			types.Typ[types.Uintptr],                 // funcptr
+		}
+	case "typecodeID":
+		fieldTypes = []types.Type{
+			types.NewPointer(named),  // references
+			types.Typ[types.Uintptr], // length
+		}
+	case "structField":
+		fieldTypes = []types.Type{
+			types.NewPointer(c.getRuntimeType("typecodeID")), // typecode
+			types.NewPointer(types.Typ[types.Uint8]),         // name
+			types.NewPointer(types.Typ[types.Uint8]),         // tag
+			types.Typ[types.Bool],                            // embedded
+		}
+	case "typeInInterface":
+		fieldTypes = []types.Type{
+			types.NewPointer(c.getRuntimeType("typecodeID")),          // typecode
+			types.NewPointer(c.getRuntimeType("interfaceMethodInfo")), // methodSet
+		}
+	case "funcValue":
+		fieldTypes = []types.Type{
+			types.Typ[types.UnsafePointer], // context
+			types.Typ[types.Uintptr],       // id
+		}
+	case "funcValueWithSignature":
+		fieldTypes = []types.Type{
+			types.Typ[types.Uintptr],                         // funcPtr
+			types.NewPointer(c.getRuntimeType("typecodeID")), // signature
+		}
+	default:
+		panic("could not find runtime type: runtime." + name)
+	}
+
+	// Create the named struct type.
+	var fields []*types.Var
+	for i, t := range fieldTypes {
+		// Field name doesn't matter: this type is only used to create a LLVM
+		// struct type which don't have field names.
+		fields = append(fields, types.NewField(token.NoPos, nil, "field"+strconv.Itoa(i), t, false))
+	}
+	named.SetUnderlying(types.NewStruct(fields, nil))
+	return named
+}
+
+// getRuntimeFuncType constructs a new runtime function signature with the given
+// name. The function signatures constructed here must match the functions in
+// the runtime package.
+func (c *compilerContext) getRuntimeFuncType(name string) *types.Signature {
+	var params []*types.Var
+	addParam := func(name string, typ types.Type) {
+		params = append(params, types.NewParam(token.NoPos, c.runtimePkg, name, typ))
+	}
+	var results []*types.Var
+	addResult := func(typ types.Type) {
+		results = append(results, types.NewParam(token.NoPos, c.runtimePkg, "", typ))
+	}
+	switch name {
+	case "_panic":
+		addParam("message", types.NewInterfaceType(nil, nil))
+	case "_recover":
+		addResult(types.NewInterfaceType(nil, nil))
+	case "nilPanic":
+	case "lookupPanic":
+	case "slicePanic":
+	case "chanMakePanic":
+	case "negativeShiftPanic":
+	case "stringEqual":
+		addParam("x", types.Typ[types.String])
+		addParam("y", types.Typ[types.String])
+		addResult(types.Typ[types.Bool])
+	case "stringLess":
+		addParam("x", types.Typ[types.String])
+		addParam("y", types.Typ[types.String])
+		addResult(types.Typ[types.Bool])
+	case "stringConcat":
+		addParam("x", c.getRuntimeType("_string"))
+		addParam("y", c.getRuntimeType("_string"))
+		addResult(c.getRuntimeType("_string"))
+	case "stringFromBytes":
+		addParam("x", types.NewStruct([]*types.Var{
+			types.NewField(token.NoPos, nil, "ptr", types.NewPointer(types.Typ[types.Byte]), false),
+			types.NewField(token.NoPos, nil, "len", types.Typ[types.Uintptr], false),
+			types.NewField(token.NoPos, nil, "cap", types.Typ[types.Uintptr], false),
+		}, nil))
+		addResult(c.getRuntimeType("_string"))
+	case "stringToBytes":
+		addParam("x", c.getRuntimeType("_string"))
+		addResult(types.NewStruct([]*types.Var{
+			types.NewField(token.NoPos, nil, "ptr", types.NewPointer(types.Typ[types.Byte]), false),
+			types.NewField(token.NoPos, nil, "len", types.Typ[types.Uintptr], false),
+			types.NewField(token.NoPos, nil, "cap", types.Typ[types.Uintptr], false),
+		}, nil))
+	case "stringFromRunes":
+		addParam("runeSlice", types.NewSlice(types.Typ[types.Rune]))
+		addResult(c.getRuntimeType("_string"))
+	case "stringToRunes":
+		addParam("s", types.Typ[types.String])
+		addResult(types.NewSlice(types.Typ[types.Rune]))
+	case "stringFromUnicode":
+		addParam("x", types.Typ[types.Rune])
+		addResult(c.getRuntimeType("_string"))
+	case "stringNext":
+		addParam("s", types.Typ[types.String])
+		addParam("it", types.NewPointer(c.getRuntimeType("stringIterator")))
+		addResult(types.Typ[types.Bool])
+		addResult(types.Typ[types.Int])
+		addResult(types.Typ[types.Rune])
+	case "complex64div":
+		addParam("n", types.Typ[types.Complex64])
+		addParam("m", types.Typ[types.Complex64])
+		addResult(types.Typ[types.Complex64])
+	case "complex128div":
+		addParam("n", types.Typ[types.Complex128])
+		addParam("m", types.Typ[types.Complex128])
+		addResult(types.Typ[types.Complex128])
+	case "sliceAppend":
+		addParam("srcBuf", types.Typ[types.UnsafePointer])
+		addParam("elemsBuf", types.Typ[types.UnsafePointer])
+		addParam("srcLen", types.Typ[types.Uintptr])
+		addParam("srcCap", types.Typ[types.Uintptr])
+		addParam("elemsLen", types.Typ[types.Uintptr])
+		addParam("elemSize", types.Typ[types.Uintptr])
+		addResult(types.Typ[types.UnsafePointer])
+		addResult(types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Uintptr])
+	case "sliceCopy":
+		addParam("dst", types.Typ[types.UnsafePointer])
+		addParam("src", types.Typ[types.UnsafePointer])
+		addParam("dstLen", types.Typ[types.Uintptr])
+		addParam("srcLen", types.Typ[types.Uintptr])
+		addParam("elemSize", types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Int])
+	case "alloc":
+		addParam("size", types.Typ[types.Uintptr])
+		addResult(types.Typ[types.UnsafePointer])
+	case "trackPointer":
+		addParam("ptr", types.Typ[types.UnsafePointer])
+	case "printbool":
+		addParam("b", types.Typ[types.Bool])
+	case "printint8":
+		addParam("n", types.Typ[types.Int8])
+	case "printuint8":
+		addParam("n", types.Typ[types.Uint8])
+	case "printint16":
+		addParam("n", types.Typ[types.Int16])
+	case "printuint16":
+		addParam("n", types.Typ[types.Uint16])
+	case "printint32":
+		addParam("n", types.Typ[types.Int32])
+	case "printuint32":
+		addParam("n", types.Typ[types.Uint32])
+	case "printint64":
+		addParam("n", types.Typ[types.Int64])
+	case "printuint64":
+		addParam("n", types.Typ[types.Uint64])
+	case "printfloat32":
+		addParam("v", types.Typ[types.Float32])
+	case "printfloat64":
+		addParam("v", types.Typ[types.Float64])
+	case "printcomplex64":
+		addParam("c", types.Typ[types.Complex64])
+	case "printcomplex128":
+		addParam("c", types.Typ[types.Complex128])
+	case "printstring":
+		addParam("s", types.Typ[types.String])
+	case "printspace":
+	case "printnl":
+	case "printptr":
+		addParam("ptr", types.Typ[types.Uintptr])
+	case "printmap":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+	case "printitf":
+		addParam("msg", types.NewInterfaceType(nil, nil))
+	case "hashmapMake":
+		addParam("keySize", types.Typ[types.Uint8])
+		addParam("valueSize", types.Typ[types.Uint8])
+		addParam("sizeHint", types.Typ[types.Uintptr])
+		addResult(types.NewPointer(c.getRuntimeType("hashmap")))
+	case "hashmapLen":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addResult(types.Typ[types.Int])
+	case "hashmapNext":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("it", types.NewPointer(c.getRuntimeType("hashmapIterator")))
+		addParam("key", types.Typ[types.UnsafePointer])
+		addParam("value", types.Typ[types.UnsafePointer])
+		addResult(types.Typ[types.Bool])
+	case "hashmapStringGet":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.Typ[types.String])
+		addParam("value", types.Typ[types.UnsafePointer])
+		addParam("valueSize", types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Bool])
+	case "hashmapStringSet":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.Typ[types.String])
+		addParam("value", types.Typ[types.UnsafePointer])
+	case "hashmapStringDelete":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.Typ[types.String])
+	case "hashmapInterfaceGet":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.NewInterfaceType(nil, nil))
+		addParam("value", types.Typ[types.UnsafePointer])
+		addParam("valueSize", types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Bool])
+	case "hashmapInterfaceSet":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.NewInterfaceType(nil, nil))
+		addParam("value", types.Typ[types.UnsafePointer])
+	case "hashmapInterfaceDelete":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.NewInterfaceType(nil, nil))
+	case "hashmapBinaryGet":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.Typ[types.UnsafePointer])
+		addParam("value", types.Typ[types.UnsafePointer])
+		addParam("valueSize", types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Bool])
+	case "hashmapBinarySet":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.Typ[types.UnsafePointer])
+		addParam("value", types.Typ[types.UnsafePointer])
+	case "hashmapBinaryDelete":
+		addParam("m", types.NewPointer(c.getRuntimeType("hashmap")))
+		addParam("key", types.Typ[types.UnsafePointer])
+	case "tryChanSelect":
+		addParam("recvbuf", types.Typ[types.UnsafePointer])
+		addParam("states", types.NewSlice(c.getRuntimeType("chanSelectState")))
+		addResult(types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Bool])
+	case "chanMake":
+		addParam("elementSize", types.Typ[types.Uintptr])
+		addParam("bufSize", types.Typ[types.Uintptr])
+		addResult(types.NewPointer(c.getRuntimeType("channel")))
+	case "chanSend":
+		addParam("ch", types.NewPointer(c.getRuntimeType("channel")))
+		addParam("value", types.Typ[types.UnsafePointer])
+	case "chanRecv":
+		addParam("ch", types.NewPointer(c.getRuntimeType("channel")))
+		addParam("value", types.Typ[types.UnsafePointer])
+		addResult(types.Typ[types.Bool])
+	case "chanClose":
+		addParam("ch", types.NewPointer(c.getRuntimeType("channel")))
+	case "chanSelect":
+		addParam("recvbuf", types.Typ[types.UnsafePointer])
+		addParam("states", types.NewSlice(c.getRuntimeType("chanSelectState")))
+		addParam("ops", types.NewSlice(c.getRuntimeType("channelBlockedList")))
+		addResult(types.Typ[types.Uintptr])
+		addResult(types.Typ[types.Bool])
+	case "deadlock":
+	case "interfaceEqual":
+		addParam("x", types.NewInterfaceType(nil, nil))
+		addParam("y", types.NewInterfaceType(nil, nil))
+		addResult(types.Typ[types.Bool])
+	case "interfaceImplements":
+		addParam("typecode", types.Typ[types.Uintptr])
+		addParam("interfaceMethodSet", types.NewPointer(types.NewPointer(types.Typ[types.Uint8])))
+		addResult(types.Typ[types.Bool])
+	case "interfaceMethod":
+		addParam("typecode", types.Typ[types.Uintptr])
+		addParam("interfaceMethodSet", types.NewPointer(types.NewPointer(types.Typ[types.Uint8])))
+		addParam("signature", types.NewPointer(types.Typ[types.Uint8]))
+		addResult(types.Typ[types.Uintptr])
+	case "typeAssert":
+		addParam("actualType", types.Typ[types.Uintptr])
+		addParam("assertedType", types.NewPointer(c.getRuntimeType("typecodeID")))
+		addResult(types.Typ[types.Bool])
+	case "interfaceTypeAssert":
+		addParam("ok", types.Typ[types.Bool])
+	case "getFuncPtr":
+		addParam("val", c.getRuntimeType("funcValue"))
+		addParam("signature", types.NewPointer(c.getRuntimeType("typecodeID")))
+		addResult(types.Typ[types.Uintptr])
+	default:
+		panic("unknown runtime call: runtime." + name)
+	}
+	return types.NewSignature(nil, types.NewTuple(params...), types.NewTuple(results...), false)
+}
@@ -15,6 +15,208 @@ import (
 	"tinygo.org/x/go-llvm"
 )

+type inlineType int
+
+// How much to inline.
+const (
+	// Default behavior. The compiler decides for itself whether any given
+	// function will be inlined. Whether any function is inlined depends on the
+	// optimization level.
+	inlineDefault inlineType = iota
+
+	// Inline hint, just like the C inline keyword (signalled using
+	// //go:inline). The compiler will be more likely to inline this function,
+	// but it is not a guarantee.
+	inlineHint
+
+	// Don't inline, just like the GCC noinline attribute. Signalled using
+	// //go:noinline.
+	inlineNone
+)
+
+// functionInfo contains some information about a function or method. In
+// particular, it contains information obtained from pragmas.
+//
+// The linkName value contains a valid link name, even though //go:linkname is
+// not present.
+type functionInfo struct {
+	linkName string     // go:linkname, go:export
+	module   string     // go:wasm-module
+	exported bool       // go:export
+	nobounds bool       // go:nobounds
+	inline   inlineType // go:inline
+}
+
+// getFunction returns the LLVM function for the given *ssa.Function, creating
+// it if needed. It can later be filled with compilerContext.createFunction().
+func (c *compilerContext) getFunction(fn *ssa.Function) llvm.Value {
+	info := c.getFunctionInfo(fn)
+	return c.getFunctionRaw(fn.Signature, info)
+}
+
+func (c *compilerContext) getFunctionRaw(sig *types.Signature, info functionInfo) llvm.Value {
+	llvmFn := c.mod.NamedFunction(info.linkName)
+	if !llvmFn.IsNil() {
+		return llvmFn
+	}
+
+	var retType llvm.Type
+	if sig.Results() == nil {
+		retType = c.ctx.VoidType()
+	} else if sig.Results().Len() == 1 {
+		retType = c.getLLVMType(sig.Results().At(0).Type())
+	} else {
+		results := make([]llvm.Type, 0, sig.Results().Len())
+		for i := 0; i < sig.Results().Len(); i++ {
+			results = append(results, c.getLLVMType(sig.Results().At(i).Type()))
+		}
+		retType = c.ctx.StructType(results, false)
+	}
+
+	var paramInfos []paramInfo
+	params := []*types.Var{}
+	if sig.Recv() != nil {
+		params = append(params, sig.Recv())
+	}
+	for i := 0; i < sig.Params().Len(); i++ {
+		params = append(params, sig.Params().At(i))
+	}
+	for _, param := range params {
+		paramType := c.getLLVMType(param.Type())
+		paramFragmentInfos := expandFormalParamType(paramType, param.Name(), param.Type())
+		paramInfos = append(paramInfos, paramFragmentInfos...)
+	}
+
+	// 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", flags: 0})
+		paramInfos = append(paramInfos, paramInfo{llvmType: c.i8ptrType, name: "parentHandle", flags: 0})
+	}
+
+	var paramTypes []llvm.Type
+	for _, info := range paramInfos {
+		paramTypes = append(paramTypes, info.llvmType)
+	}
+
+	fnType := llvm.FunctionType(retType, paramTypes, false)
+	llvmFn = llvm.AddFunction(c.mod, info.linkName, fnType)
+
+	dereferenceableOrNullKind := llvm.AttributeKindID("dereferenceable_or_null")
+	for i, info := range paramInfos {
+		if info.flags&paramIsDeferenceableOrNull == 0 {
+			continue
+		}
+		if info.llvmType.TypeKind() == llvm.PointerTypeKind {
+			el := info.llvmType.ElementType()
+			size := c.targetData.TypeAllocSize(el)
+			if size == 0 {
+				// dereferenceable_or_null(0) appears to be illegal in LLVM.
+				continue
+			}
+			dereferenceableOrNull := c.ctx.CreateEnumAttribute(dereferenceableOrNullKind, size)
+			llvmFn.AddAttributeAtIndex(i+1, dereferenceableOrNull)
+		}
+	}
+
+	// External/exported functions may not retain pointer values.
+	// https://golang.org/cmd/cgo/#hdr-Passing_pointers
+	if info.exported {
+		// Set the wasm-import-module attribute if the function's module is set.
+		if info.module != "" {
+			wasmImportModuleAttr := c.ctx.CreateStringAttribute("wasm-import-module", info.module)
+			llvmFn.AddFunctionAttr(wasmImportModuleAttr)
+		}
+		nocaptureKind := llvm.AttributeKindID("nocapture")
+		nocapture := c.ctx.CreateEnumAttribute(nocaptureKind, 0)
+		for i, typ := range paramTypes {
+			if typ.TypeKind() == llvm.PointerTypeKind {
+				llvmFn.AddAttributeAtIndex(i+1, nocapture)
+			}
+		}
+	}
+	return llvmFn
+}
+
+// getFunctionInfo returns information about a function that is not directly
+// present in *ssa.Function, such as the link name and whether it should be
+// exported.
+func (c *compilerContext) getFunctionInfo(f *ssa.Function) functionInfo {
+	info := functionInfo{}
+	if strings.HasPrefix(f.Name(), "C.") {
+		// Created by CGo: such a name cannot be created by regular C code.
+		info.linkName = f.Name()[2:]
+		info.exported = true
+	} else {
+		// Pick the default linkName.
+		info.linkName = f.RelString(nil)
+		// Check for //go: pragmas, which may change the link name (among
+		// others).
+		info.parsePragmas(f)
+	}
+	return info
+}
+
+// parsePragmas is used by getFunctionInfo to parse function pragmas such as
+// //export or //go:noinline.
+func (info *functionInfo) parsePragmas(f *ssa.Function) {
+	// Parse compiler directives in the preceding comments.
+	if f.Syntax() == nil {
+		return
+	}
+	if decl, ok := f.Syntax().(*ast.FuncDecl); ok && decl.Doc != nil {
+		for _, comment := range decl.Doc.List {
+			text := comment.Text
+			if strings.HasPrefix(text, "//export ") {
+				// Rewrite '//export' to '//go:export' for compatibility with
+				// gc.
+				text = "//go:" + text[2:]
+			}
+			if !strings.HasPrefix(text, "//go:") {
+				continue
+			}
+			parts := strings.Fields(text)
+			switch parts[0] {
+			case "//go:export":
+				if len(parts) != 2 {
+					continue
+				}
+				info.linkName = parts[1]
+				info.exported = true
+			case "//go:wasm-module":
+				// Alternative comment for setting the import module.
+				if len(parts) != 2 {
+					continue
+				}
+				info.module = parts[1]
+			case "//go:inline":
+				info.inline = inlineHint
+			case "//go:noinline":
+				info.inline = inlineNone
+			case "//go:linkname":
+				if len(parts) != 3 || parts[1] != f.Name() {
+					continue
+				}
+				// Only enable go:linkname when the package imports "unsafe".
+				// This is a slightly looser requirement than what gc uses: gc
+				// requires the file to import "unsafe", not the package as a
+				// whole.
+				if hasUnsafeImport(f.Pkg.Pkg) {
+					info.linkName = parts[2]
+				}
+			case "//go:nobounds":
+				// Skip bounds checking in this function. Useful for some
+				// runtime functions.
+				// This is somewhat dangerous and thus only imported in packages
+				// that import unsafe.
+				if hasUnsafeImport(f.Pkg.Pkg) {
+					info.nobounds = true
+				}
+			}
+		}
+	}
+}
+
 // globalInfo contains some information about a specific global. By default,
 // linkName is equal to .RelString(nil) on a global and extern is false, but for
 // some symbols this is different (due to //go:extern for example).
@@ -86,7 +288,7 @@ func (c *compilerContext) getGlobal(g *ssa.Global) llvm.Value {
 			// Add debug info.
 			// TODO: this should be done for every global in the program, not just
 			// the ones that are referenced from some code.
-			pos := c.ir.Program.Fset.Position(g.Pos())
+			pos := c.program.Fset.Position(g.Pos())
 			diglobal := c.dibuilder.CreateGlobalVariableExpression(c.difiles[pos.Filename], llvm.DIGlobalVariableExpression{
 				Name:        g.RelString(nil),
 				LinkageName: info.linkName,
@@ -145,3 +347,23 @@ func (info *globalInfo) parsePragmas(doc *ast.CommentGroup) {
 		}
 	}
 }
+
+// Get all methods of a type.
+func getAllMethods(prog *ssa.Program, typ types.Type) []*types.Selection {
+	ms := prog.MethodSets.MethodSet(typ)
+	methods := make([]*types.Selection, ms.Len())
+	for i := 0; i < ms.Len(); i++ {
+		methods[i] = ms.At(i)
+	}
+	return methods
+}
+
+// Return true if this package imports "unsafe", false otherwise.
+func hasUnsafeImport(pkg *types.Package) bool {
+	for _, imp := range pkg.Imports() {
+		if imp == types.Unsafe {
+			return true
+		}
+	}
+	return false
+}
@@ -0,0 +1,13 @@
+package main
+
+func add(x, y int) int {
+	return x + y
+}
+
+func stringEqual(s string) bool {
+	return s == "s"
+}
+
+func closeChan(ch chan int) {
+	close(ch)
+}
@@ -0,0 +1,41 @@
+target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "armv7m-none-eabi"
+
+%runtime.channel = type { i32, i32, i8, %runtime.channelBlockedList*, i32, i32, i32, i8* }
+%runtime.channelBlockedList = type { %runtime.channelBlockedList*, %"internal/task.Task"*, %runtime.chanSelectState*, { %runtime.channelBlockedList*, i32, i32 } }
+%"internal/task.Task" = type opaque
+%runtime.chanSelectState = type { %runtime.channel*, i8* }
+%runtime._string = type { i8*, i32 }
+
+@"main.stringEqual$string" = internal unnamed_addr constant [1 x i8] c"s"
+
+define internal i32 @main.add(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr {
+entry:
+  %0 = add i32 %x, %y
+  ret i32 %0
+}
+
+define internal void @main.closeChan(%runtime.channel* dereferenceable_or_null(32) %ch, i8* %context, i8* %parentHandle) unnamed_addr {
+entry:
+  call void @runtime.chanClose(%runtime.channel* %ch, i8* undef, i8* null)
+  ret void
+}
+
+declare void @runtime.chanClose(%runtime.channel* dereferenceable_or_null(32), i8*, i8*)
+
+define internal void @main.init(i8* %context, i8* %parentHandle) unnamed_addr {
+entry:
+  ret void
+}
+
+define internal i1 @main.stringEqual(i8* %s.data, i32 %s.len, i8* %context, i8* %parentHandle) unnamed_addr {
+entry:
+  %0 = insertvalue %runtime._string zeroinitializer, i8* %s.data, 0
+  %1 = insertvalue %runtime._string %0, i32 %s.len, 1
+  %2 = extractvalue %runtime._string %1, 0
+  %3 = extractvalue %runtime._string %1, 1
+  %4 = call i1 @runtime.stringEqual(i8* %2, i32 %3, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @"main.stringEqual$string", i32 0, i32 0), i32 1, i8* undef, i8* null)
+  ret i1 %4
+}
+
+declare i1 @runtime.stringEqual(i8*, i32, i8*, i32, i8*, i8*)
@@ -4,11 +4,10 @@ go 1.11

 require (
 	github.com/blakesmith/ar v0.0.0-20150311145944-8bd4349a67f2
-	github.com/chromedp/cdproto v0.0.0-20200709115526-d1f6fc58448b
-	github.com/chromedp/chromedp v0.5.4-0.20200303084119-2bb39134ab9e
 	github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf
-	github.com/marcinbor85/gohex v0.0.0-20200531091804-343a4b548892
+	github.com/marcinbor85/gohex v0.0.0-20180128172054-7a43cd876e46
 	go.bug.st/serial v1.0.0
 	golang.org/x/tools v0.0.0-20200216192241-b320d3a0f5a2
-	tinygo.org/x/go-llvm v0.0.0-20201104183921-570e7a6841d9
+	google.golang.org/appengine v1.4.0 // indirect
+	tinygo.org/x/go-llvm v0.0.0-20200401165421-8d120882fc7a
 )
@@ -1,28 +1,13 @@
 github.com/blakesmith/ar v0.0.0-20150311145944-8bd4349a67f2 h1:oMCHnXa6CCCafdPDbMh/lWRhRByN0VFLvv+g+ayx1SI=
 github.com/blakesmith/ar v0.0.0-20150311145944-8bd4349a67f2/go.mod h1:PkYb9DJNAwrSvRx5DYA+gUcOIgTGVMNkfSCbZM8cWpI=
-github.com/chromedp/cdproto v0.0.0-20200116234248-4da64dd111ac/go.mod h1:PfAWWKJqjlGFYJEidUM6aVIWPr0EpobeyVWEEmplX7g=
-github.com/chromedp/cdproto v0.0.0-20200709115526-d1f6fc58448b h1:LF+GRwyzxrO3MUzPvejv+yBup0lNG+/QdIRrkxOPseA=
-github.com/chromedp/cdproto v0.0.0-20200709115526-d1f6fc58448b/go.mod h1:E6LPWRdIJc11h/di5p0rwvRmUYbhGpBEH7ZbPfzDIOE=
-github.com/chromedp/chromedp v0.5.4-0.20200303084119-2bb39134ab9e h1:Hv0JVyHhbIXb9NiYQe4NsrfgrSofAp0q2FnhhJOXgi8=
-github.com/chromedp/chromedp v0.5.4-0.20200303084119-2bb39134ab9e/go.mod h1:vmQMRHFZrY3T+Jv51T0n87OK/i6bK+5P9a+Fg5jPwgQ=
 github.com/creack/goselect v0.1.1 h1:tiSSgKE1eJtxs1h/VgGQWuXUP0YS4CDIFMp6vaI1ls0=
 github.com/creack/goselect v0.1.1/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee h1:s+21KNqlpePfkah2I+gwHF8xmJWRjooY+5248k6m4A0=
-github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee/go.mod h1:L0fX3K22YWvt/FAX9NnzrNzcI4wNYi9Yku4O0LKYflo=
-github.com/gobwas/pool v0.2.0 h1:QEmUOlnSjWtnpRGHF3SauEiOsy82Cup83Vf2LcMlnc8=
-github.com/gobwas/pool v0.2.0/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6WezmKEw=
-github.com/gobwas/ws v1.0.3 h1:ZOigqf7iBxkA4jdQ3am7ATzdlOFp9YzA6NmuvEEZc9g=
-github.com/gobwas/ws v1.0.3/go.mod h1:szmBTxLgaFppYjEmNtny/v3w89xOydFnnZMcgRRu/EM=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf h1:7+FW5aGwISbqUtkfmIpZJGRgNFg2ioYPvFaUxdqpDsg=
 github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf/go.mod h1:RpwtwJQFrIEPstU94h88MWPXP2ektJZ8cZ0YntAmXiE=
-github.com/knq/sysutil v0.0.0-20191005231841-15668db23d08 h1:V0an7KRw92wmJysvFvtqtKMAPmvS5O0jtB0nYo6t+gs=
-github.com/knq/sysutil v0.0.0-20191005231841-15668db23d08/go.mod h1:dFWs1zEqDjFtnBXsd1vPOZaLsESovai349994nHx3e0=
-github.com/mailru/easyjson v0.7.0/go.mod h1:KAzv3t3aY1NaHWoQz1+4F1ccyAH66Jk7yos7ldAVICs=
-github.com/mailru/easyjson v0.7.1 h1:mdxE1MF9o53iCb2Ghj1VfWvh7ZOwHpnVG/xwXrV90U8=
-github.com/mailru/easyjson v0.7.1/go.mod h1:KAzv3t3aY1NaHWoQz1+4F1ccyAH66Jk7yos7ldAVICs=
-github.com/marcinbor85/gohex v0.0.0-20200531091804-343a4b548892 h1:6J+qramlHVLmiBOgRiBOnQkno8uprqG6YFFQTt6uYIw=
-github.com/marcinbor85/gohex v0.0.0-20200531091804-343a4b548892/go.mod h1:Pb6XcsXyropB9LNHhnqaknG/vEwYztLkQzVCHv8sQ3M=
+github.com/marcinbor85/gohex v0.0.0-20180128172054-7a43cd876e46 h1:wXG2bA8fO7Vv7lLk2PihFMTqmbT173Tje39oKzQ50Mo=
+github.com/marcinbor85/gohex v0.0.0-20180128172054-7a43cd876e46/go.mod h1:Pb6XcsXyropB9LNHhnqaknG/vEwYztLkQzVCHv8sQ3M=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
@@ -32,21 +17,43 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee h1:WG0RUwxtNT4qqaXX3DPA8zHFNm/D9xaBpxzHt1WcA/E=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9 h1:ZBzSG/7F4eNKz2L3GE9o300RX0Az1Bw5HF7PDraD+qU=
 golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200116001909-b77594299b42 h1:vEOn+mP2zCOVzKckCZy6YsCtDblrpj/w7B9nxGNELpg=
-golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190227180812-8dcc6e70cdef h1:ymc9FeDom3RIEA3coKokSllBB1hRcMT0tZ1W3Jf9Ids=
+golang.org/x/tools v0.0.0-20190227180812-8dcc6e70cdef/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20200216192241-b320d3a0f5a2 h1:0sfSpGSa544Fwnbot3Oxq/U6SXqjty6Jy/3wRhVS7ig=
 golang.org/x/tools v0.0.0-20200216192241-b320d3a0f5a2/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-tinygo.org/x/go-llvm v0.0.0-20201104183921-570e7a6841d9 h1:l2kTQOhqEoeDTK3ckUnwReOQwMPUmURMIdjJbeAuDT4=
-tinygo.org/x/go-llvm v0.0.0-20201104183921-570e7a6841d9/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20190224120431-7707ae5d1261 h1:rJS2Hga39YAnm7DE4qrPm6Dr/67EOojL0XPzvbEeBiw=
+tinygo.org/x/go-llvm v0.0.0-20190224120431-7707ae5d1261/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20190818154551-95bc4ffe1add h1:dFjMH1sLhYADg8UQm7DB56B7e+TfvAmWmEZLhyv3r/w=
+tinygo.org/x/go-llvm v0.0.0-20190818154551-95bc4ffe1add/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20191103182207-90b6e4bdc0b9 h1:d6rAX39a3C0pKrY5HcojEGyN8w9ocU0v7X28lC/TRKU=
+tinygo.org/x/go-llvm v0.0.0-20191103182207-90b6e4bdc0b9/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20191103200204-37e93e3f04e2 h1:Q5Hv3e5cLMGkiYwYgZL1Zrv6nb/EY+DJpRWrdO6ws6o=
+tinygo.org/x/go-llvm v0.0.0-20191103200204-37e93e3f04e2/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20191113125529-bad6d01809e8 h1:9Bfvso+tTVQg16UzOA614NaYA4x8vsRBNtd3eBrXwp0=
+tinygo.org/x/go-llvm v0.0.0-20191113125529-bad6d01809e8/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20191124211856-b2db3df3f257 h1:o8VDylrMN7gWemBMu8rEyuogKPhcLTdx5KrUAp9macc=
+tinygo.org/x/go-llvm v0.0.0-20191124211856-b2db3df3f257/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20191215173731-ad71f3d24aae h1:s8J5EyxCkHxXB08UI3gk9W9IS/ekizRvSX+PfZxnAB0=
+tinygo.org/x/go-llvm v0.0.0-20191215173731-ad71f3d24aae/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20200104190746-1ff21df33566 h1:a4y30bTf7U0zDA75v2PTL+XQ2OzJetj19gK8XwQpUNY=
+tinygo.org/x/go-llvm v0.0.0-20200104190746-1ff21df33566/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20200226165415-53522ab6713d h1:mtgZh/e8a3wxneQFuLXoQYO//1mvlki02yZ1JCwMKp4=
+tinygo.org/x/go-llvm v0.0.0-20200226165415-53522ab6713d/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
+tinygo.org/x/go-llvm v0.0.0-20200401165421-8d120882fc7a h1:Ugje2Lxuv8CFncHzs5W+hWfJvPsM+W4K0zRvzFbLvoE=
+tinygo.org/x/go-llvm v0.0.0-20200401165421-8d120882fc7a/go.mod h1:fv1F0BSNpxMfCL0zF3M4OPFbgYHnhtB6ST0HvUtu/LE=
@@ -1,68 +0,0 @@
-package goenv
-
-import (
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"path/filepath"
-	"regexp"
-	"strings"
-)
-
-// Version of TinyGo.
-// Update this value before release of new version of software.
-const Version = "0.16.0"
-
-// 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)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	if s == "" || s[:2] != "go" {
-		return 0, 0, errors.New("could not parse Go version: version does not start with 'go' prefix")
-	}
-
-	parts := strings.Split(s[2:], ".")
-	if len(parts) < 2 {
-		return 0, 0, errors.New("could not parse Go version: version has less than two parts")
-	}
-
-	// Ignore the errors, we don't really handle errors here anyway.
-	var trailing string
-	n, err := fmt.Sscanf(s, "go%d.%d%s", &major, &minor, &trailing)
-	if n == 2 && err == io.EOF {
-		// Means there were no trailing characters (i.e., not an alpha/beta)
-		err = nil
-	}
-	if err != nil {
-		return 0, 0, fmt.Errorf("failed to parse version: %s", err)
-	}
-	return
-}
-
-// 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 := ioutil.ReadFile(filepath.Join(
-		goroot, "src", "runtime", "internal", "sys", "zversion.go")); err == nil {
-
-		r := regexp.MustCompile("const TheVersion = `(.*)`")
-		matches := r.FindSubmatch(data)
-		if len(matches) != 2 {
-			return "", errors.New("Invalid go version output:\n" + string(data))
-		}
-
-		return string(matches[1]), nil
-
-	} else if data, err := ioutil.ReadFile(filepath.Join(goroot, "VERSION")); err == nil {
-		return string(data), nil
-
-	} else {
-		return "", err
-	}
-}
@@ -1,5 +0,0 @@
-# Hooks for Docker Hub
-
-Files in this directory are custom commands to be run during the different Docker Hub build phases.
-
-See https://docs.docker.com/docker-hub/builds/advanced/#custom-build-phase-hooks
@@ -1,4 +0,0 @@
-#!/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
@@ -47,12 +47,10 @@ func (e *Error) Error() string {
 // location of the instruction. The location information may not be complete as
 // it depends on debug information in the IR.
 func (e *evalPackage) errorAt(inst llvm.Value, err error) *Error {
-	pos := getPosition(inst)
 	return &Error{
 		ImportPath: e.packagePath,
-		Pos:        pos,
+		Pos:        getPosition(inst),
 		Err:        err,
-		Traceback:  []ErrorLine{{pos, inst}},
 	}
 }

@@ -95,11 +95,7 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 			if !operand.IsConstant() || inst.IsVolatile() || (!operand.Underlying.IsAConstantExpr().IsNil() && operand.Underlying.Opcode() == llvm.BitCast) {
 				value = fr.builder.CreateLoad(operand.Value(), inst.Name())
 			} else {
-				var err error
-				value, err = operand.Load()
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
+				value = operand.Load()
 			}
 			if value.Type() != inst.Type() {
 				return nil, nil, fr.errorAt(inst, errors.New("interp: load: type does not match"))
@@ -111,10 +107,7 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 			if inst.IsVolatile() {
 				fr.builder.CreateStore(value.Value(), ptr.Value())
 			} else {
-				err := ptr.Store(value.Value())
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
+				ptr.Store(value.Value())
 			}
 		case !inst.IsAGetElementPtrInst().IsNil():
 			value := fr.getLocal(inst.Operand(0))
@@ -290,6 +283,7 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 					PkgName:   fr.packagePath,
 					KeySize:   int(keySize),
 					ValueSize: int(valueSize),
+					MapType:   inst.Type().ElementType(),
 				}
 			case callee.Name() == "runtime.hashmapStringSet":
 				// set a string key in the map
@@ -315,10 +309,7 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 				}
 				// "key" is a Go string value, which in the TinyGo calling convention is split up
 				// into separate pointer and length parameters.
-				err := m.PutString(keyBuf, keyLen, valPtr)
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
+				m.PutString(keyBuf, keyLen, valPtr)
 			case callee.Name() == "runtime.hashmapBinarySet":
 				// set a binary (int etc.) key in the map
 				keyBuf := fr.getLocal(inst.Operand(1)).(*LocalValue)
@@ -339,24 +330,15 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 					fr.builder.CreateCall(callee, llvmParams, "")
 					continue
 				}
-				err := m.PutBinary(keyBuf, valPtr)
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
+				m.PutBinary(keyBuf, valPtr)
 			case callee.Name() == "runtime.stringConcat":
 				// adding two strings together
 				buf1Ptr := fr.getLocal(inst.Operand(0))
 				buf1Len := fr.getLocal(inst.Operand(1))
 				buf2Ptr := fr.getLocal(inst.Operand(2))
 				buf2Len := fr.getLocal(inst.Operand(3))
-				buf1, err := getStringBytes(buf1Ptr, buf1Len.Value())
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
-				buf2, err := getStringBytes(buf2Ptr, buf2Len.Value())
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
+				buf1 := getStringBytes(buf1Ptr, buf1Len.Value())
+				buf2 := getStringBytes(buf2Ptr, buf2Len.Value())
 				result := []byte(string(buf1) + string(buf2))
 				vals := make([]llvm.Value, len(result))
 				for i := range vals {
@@ -369,7 +351,7 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 				global.SetLinkage(llvm.InternalLinkage)
 				global.SetGlobalConstant(true)
 				global.SetUnnamedAddr(true)
-				stringType := fr.Mod.GetTypeByName("runtime._string")
+				stringType := inst.Type()
 				retPtr := llvm.ConstGEP(global, getLLVMIndices(fr.Mod.Context().Int32Type(), []uint32{0, 0}))
 				retLen := llvm.ConstInt(stringType.StructElementTypes()[1], uint64(len(result)), false)
 				ret := llvm.ConstNull(stringType)
@@ -420,15 +402,9 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 					return nil, nil, fr.errorAt(inst, errors.New("interp: trying to copy a slice with negative length?"))
 				}
 				for i := int64(0); i < length; i++ {
+					var err error
 					// *dst = *src
-					val, err := srcArray.Load()
-					if err != nil {
-						return nil, nil, fr.errorAt(inst, err)
-					}
-					err = dstArray.Store(val)
-					if err != nil {
-						return nil, nil, fr.errorAt(inst, err)
-					}
+					dstArray.Store(srcArray.Load())
 					// dst++
 					dstArrayValue, err := dstArray.GetElementPtr([]uint32{1})
 					if err != nil {
@@ -446,10 +422,7 @@ func (fr *frame) evalBasicBlock(bb, incoming llvm.BasicBlock, indent string) (re
 				// convert a string to a []byte
 				bufPtr := fr.getLocal(inst.Operand(0))
 				bufLen := fr.getLocal(inst.Operand(1))
-				result, err := getStringBytes(bufPtr, bufLen.Value())
-				if err != nil {
-					return nil, nil, fr.errorAt(inst, err)
-				}
+				result := getStringBytes(bufPtr, bufLen.Value())
 				vals := make([]llvm.Value, len(result))
 				for i := range vals {
 					vals[i] = llvm.ConstInt(fr.Mod.Context().Int8Type(), uint64(result[i]), false)
@@ -3,7 +3,6 @@ package interp
 import (
 	"io/ioutil"
 	"os"
-	"regexp"
 	"strings"
 	"testing"

@@ -67,8 +66,6 @@ func runTest(t *testing.T, pathPrefix string) {
 	}
 }

-var alignRegexp = regexp.MustCompile(", align [0-9]+$")
-
 // fuzzyEqualIR returns true if the two LLVM IR strings passed in are roughly
 // equal. That means, only relevant lines are compared (excluding comments
 // etc.).
@@ -78,18 +75,8 @@ func fuzzyEqualIR(s1, s2 string) bool {
 	if len(lines1) != len(lines2) {
 		return false
 	}
-	for i, line1 := range lines1 {
-		line2 := lines2[i]
-		match1 := alignRegexp.MatchString(line1)
-		match2 := alignRegexp.MatchString(line2)
-		if match1 != match2 {
-			// Only one of the lines has the align keyword. Remove it.
-			// This is a change to make the test work in both LLVM 10 and LLVM
-			// 11 (LLVM 11 appears to automatically add alignment everywhere).
-			line1 = alignRegexp.ReplaceAllString(line1, "")
-			line2 = alignRegexp.ReplaceAllString(line2, "")
-		}
-		if line1 != line2 {
+	for i, line := range lines1 {
+		if line != lines2[i] {
 			return false
 		}
 	}
@@ -62,10 +62,6 @@ func (e *evalPackage) hasSideEffects(fn llvm.Value) (*sideEffectResult, *Error)
 		return &sideEffectResult{severity: sideEffectNone}, nil
 	case name == "llvm.dbg.value":
 		return &sideEffectResult{severity: sideEffectNone}, nil
-	case name == "(*sync/atomic.Value).Load" || name == "(*sync/atomic.Value).Store":
-		// These functions do some unsafe pointer loading/storing but are
-		// otherwise safe.
-		return &sideEffectResult{severity: sideEffectLimited}, nil
 	case strings.HasPrefix(name, "llvm.lifetime."):
 		return &sideEffectResult{severity: sideEffectNone}, nil
 	}
@@ -126,8 +122,6 @@ func (e *evalPackage) hasSideEffects(fn llvm.Value) (*sideEffectResult, *Error)
 					// External function call. Assume only limited side effects
 					// (no affected globals, etc.).
 					switch child.Name() {
-					case "runtime.alloc":
-						continue
 					case "runtime.typeAssert":
 						continue // implemented in interp
 					case "runtime.interfaceImplements":
@@ -1,8 +1,6 @@
 package interp

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

@@ -20,23 +18,20 @@ func getUses(value llvm.Value) []llvm.Value {

 // getStringBytes loads the byte slice of a Go string represented as a
 // {ptr, len} pair.
-func getStringBytes(strPtr Value, strLen llvm.Value) ([]byte, error) {
+func getStringBytes(strPtr Value, strLen llvm.Value) []byte {
 	if !strLen.IsConstant() {
-		return nil, errors.New("getStringBytes with a non-constant length")
+		panic("getStringBytes with a non-constant length")
 	}
 	buf := make([]byte, strLen.ZExtValue())
 	for i := range buf {
 		gep, err := strPtr.GetElementPtr([]uint32{uint32(i)})
 		if err != nil {
-			return nil, err
-		}
-		c, err := gep.Load()
-		if err != nil {
-			return nil, err
+			panic(err) // TODO
 		}
+		c := gep.Load()
 		buf[i] = byte(c.ZExtValue())
 	}
-	return buf, nil
+	return buf
 }

 // getLLVMIndices converts an []uint32 into an []llvm.Value, for use in
@@ -15,8 +15,8 @@ type Value interface {
 	Value() llvm.Value                     // returns a LLVM value
 	Type() llvm.Type                       // equal to Value().Type()
 	IsConstant() bool                      // returns true if this value is a constant value
-	Load() (llvm.Value, error)             // dereference a pointer
-	Store(llvm.Value) error                // store to a pointer
+	Load() llvm.Value                      // dereference a pointer
+	Store(llvm.Value)                      // store to a pointer
 	GetElementPtr([]uint32) (Value, error) // returns an interior pointer
 	String() string                        // string representation, for debugging
 }
@@ -44,32 +44,29 @@ func (v *LocalValue) IsConstant() bool {
 }

 // Load loads a constant value if this is a constant pointer.
-func (v *LocalValue) Load() (llvm.Value, error) {
+func (v *LocalValue) Load() llvm.Value {
 	if !v.Underlying.IsAGlobalVariable().IsNil() {
-		return v.Underlying.Initializer(), nil
+		return v.Underlying.Initializer()
 	}
 	switch v.Underlying.Opcode() {
 	case llvm.GetElementPtr:
 		indices := v.getConstGEPIndices()
 		if indices[0] != 0 {
-			return llvm.Value{}, errors.New("invalid GEP")
+			panic("invalid GEP")
 		}
 		global := v.Eval.getValue(v.Underlying.Operand(0))
-		agg, err := global.Load()
-		if err != nil {
-			return llvm.Value{}, err
-		}
-		return llvm.ConstExtractValue(agg, indices[1:]), nil
+		agg := global.Load()
+		return llvm.ConstExtractValue(agg, indices[1:])
 	case llvm.BitCast:
-		return llvm.Value{}, errors.New("interp: load from a bitcast")
+		panic("interp: load from a bitcast")
 	default:
-		return llvm.Value{}, errors.New("interp: load from a constant")
+		panic("interp: load from a constant")
 	}
 }

 // Store stores to the underlying value if the value type is a pointer type,
-// otherwise it returns an error.
-func (v *LocalValue) Store(value llvm.Value) error {
+// otherwise it panics.
+func (v *LocalValue) Store(value llvm.Value) {
 	if !v.Underlying.IsAGlobalVariable().IsNil() {
 		if !value.IsConstant() {
 			v.MarkDirty()
@@ -77,28 +74,26 @@ func (v *LocalValue) Store(value llvm.Value) error {
 		} else {
 			v.Underlying.SetInitializer(value)
 		}
-		return nil
+		return
 	}
 	if !value.IsConstant() {
 		v.MarkDirty()
 		v.Eval.builder.CreateStore(value, v.Underlying)
-		return nil
+		return
 	}
 	switch v.Underlying.Opcode() {
 	case llvm.GetElementPtr:
 		indices := v.getConstGEPIndices()
 		if indices[0] != 0 {
-			return errors.New("invalid GEP")
+			panic("invalid GEP")
 		}
 		global := &LocalValue{v.Eval, v.Underlying.Operand(0)}
-		agg, err := global.Load()
-		if err != nil {
-			return err
-		}
+		agg := global.Load()
 		agg = llvm.ConstInsertValue(agg, value, indices[1:])
-		return global.Store(agg)
+		global.Store(agg)
+		return
 	default:
-		return errors.New("interp: store on a constant")
+		panic("interp: store on a constant")
 	}
 }

@@ -183,6 +178,8 @@ type MapValue struct {
 	ValueSize  int
 	KeyType    llvm.Type
 	ValueType  llvm.Type
+	MapType    llvm.Type // *%runtime.hashmap
+	keyVariant string
 }

 func (v *MapValue) newBucket() llvm.Value {
@@ -226,31 +223,32 @@ func (v *MapValue) Value() llvm.Value {
 		var keyBuf []byte
 		llvmKey := key.Value()
 		llvmValue := v.Values[i].Value()
-		if key.Type().TypeKind() == llvm.StructTypeKind && key.Type().StructName() == "runtime._string" {
+		switch v.keyVariant {
+		case "string":
 			keyPtr := llvm.ConstExtractValue(llvmKey, []uint32{0})
 			keyLen := llvm.ConstExtractValue(llvmKey, []uint32{1})
 			keyPtrVal := v.Eval.getValue(keyPtr)
-			var err error
-			keyBuf, err = getStringBytes(keyPtrVal, keyLen)
-			if err != nil {
-				panic(err) // TODO
+			keyBuf = getStringBytes(keyPtrVal, keyLen)
+		case "binary":
+			if key.Type().TypeKind() == llvm.IntegerTypeKind {
+				keyBuf = make([]byte, v.Eval.TargetData.TypeAllocSize(key.Type()))
+				n := key.Value().ZExtValue()
+				for i := range keyBuf {
+					keyBuf[i] = byte(n)
+					n >>= 8
+				}
+			} else if key.Type().TypeKind() == llvm.ArrayTypeKind &&
+				key.Type().ElementType().TypeKind() == llvm.IntegerTypeKind &&
+				key.Type().ElementType().IntTypeWidth() == 8 {
+				keyBuf = make([]byte, v.Eval.TargetData.TypeAllocSize(key.Type()))
+				for i := range keyBuf {
+					keyBuf[i] = byte(llvm.ConstExtractValue(llvmKey, []uint32{uint32(i)}).ZExtValue())
+				}
+			} else {
+				panic("interp: map key type not implemented: " + key.Type().String())
 			}
-		} else if key.Type().TypeKind() == llvm.IntegerTypeKind {
-			keyBuf = make([]byte, v.Eval.TargetData.TypeAllocSize(key.Type()))
-			n := key.Value().ZExtValue()
-			for i := range keyBuf {
-				keyBuf[i] = byte(n)
-				n >>= 8
-			}
-		} else if key.Type().TypeKind() == llvm.ArrayTypeKind &&
-			key.Type().ElementType().TypeKind() == llvm.IntegerTypeKind &&
-			key.Type().ElementType().IntTypeWidth() == 8 {
-			keyBuf = make([]byte, v.Eval.TargetData.TypeAllocSize(key.Type()))
-			for i := range keyBuf {
-				keyBuf[i] = byte(llvm.ConstExtractValue(llvmKey, []uint32{uint32(i)}).ZExtValue())
-			}
-		} else {
-			panic("interp: map key type not implemented: " + key.Type().String())
+		default:
+			panic("interp: map key variant: " + v.keyVariant)
 		}
 		hash := v.hash(keyBuf)

@@ -300,7 +298,7 @@ func (v *MapValue) Value() llvm.Value {

 // Type returns type runtime.hashmap, which is the actual hashmap type.
 func (v *MapValue) Type() llvm.Type {
-	return v.Eval.Mod.GetTypeByName("runtime.hashmap")
+	return v.MapType
 }

 func (v *MapValue) IsConstant() bool {
@@ -308,15 +306,13 @@ func (v *MapValue) IsConstant() bool {
 }

 // Load panics: maps are of reference type so cannot be dereferenced.
-func (v *MapValue) Load() (llvm.Value, error) {
+func (v *MapValue) Load() llvm.Value {
 	panic("interp: load from a map")
 }

-// Store returns an error: maps are of reference type so cannot be stored to.
-func (v *MapValue) Store(value llvm.Value) error {
-	// This must be a bug, but it might be helpful to indicate the location
-	// anyway.
-	return errors.New("interp: store on a map")
+// Store panics: maps are of reference type so cannot be stored to.
+func (v *MapValue) Store(value llvm.Value) {
+	panic("interp: store on a map")
 }

 // GetElementPtr panics: maps are of reference type so their (interior)
@@ -325,65 +321,80 @@ func (v *MapValue) GetElementPtr(indices []uint32) (Value, error) {
 	return nil, errors.New("interp: GEP on a map")
 }

+// setKeyVariant sets the key variant as a result of storing to the hashmap
+// (string, binary, or interface). The way that TinyGo is structured, the key
+// variant is not known until there is a store to the hashmap.
+// The key variant has to be known when lowering the hashmap to its final form,
+// to correctly calculate the hash of a key (for example, a string key must
+// calculate the hash over the string contents).
+func (v *MapValue) setKeyVariant(keyVariant string) {
+	if v.keyVariant == "" {
+		v.keyVariant = keyVariant
+		return
+	}
+	if v.keyVariant != keyVariant {
+		// Valid IR will not cause this panic to occur.
+		panic("MapValue store with inconsistent key type")
+	}
+}
+
 // PutString does a map assign operation, assuming that the map is of type
 // map[string]T.
-func (v *MapValue) PutString(keyBuf, keyLen, valPtr *LocalValue) error {
+func (v *MapValue) PutString(keyBuf, keyLen, valPtr *LocalValue) {
 	if !v.Underlying.IsNil() {
-		return errors.New("map already created")
+		panic("map already created")
 	}
+	v.setKeyVariant("string")

 	if valPtr.Underlying.Opcode() == llvm.BitCast {
 		valPtr = &LocalValue{v.Eval, valPtr.Underlying.Operand(0)}
 	}
-	value, err := valPtr.Load()
-	if err != nil {
-		return err
-	}
+	value := valPtr.Load()
 	if v.ValueType.IsNil() {
 		v.ValueType = value.Type()
 		if int(v.Eval.TargetData.TypeAllocSize(v.ValueType)) != v.ValueSize {
-			return errors.New("interp: map store value type has the wrong size")
+			panic("interp: map store value type has the wrong size")
 		}
 	} else {
 		if value.Type() != v.ValueType {
-			return errors.New("interp: map store value type is inconsistent")
+			panic("interp: map store value type is inconsistent")
 		}
 	}

-	keyType := v.Eval.Mod.GetTypeByName("runtime._string")
-	v.KeyType = keyType
-	key := llvm.ConstNull(keyType)
+	if v.KeyType.IsNil() {
+		v.KeyType = v.Eval.Mod.Context().StructType([]llvm.Type{
+			keyBuf.Type(),
+			keyLen.Type(),
+		}, false)
+	}
+	key := llvm.ConstNull(v.KeyType)
 	key = llvm.ConstInsertValue(key, keyBuf.Value(), []uint32{0})
 	key = llvm.ConstInsertValue(key, keyLen.Value(), []uint32{1})

 	// TODO: avoid duplicate keys
 	v.Keys = append(v.Keys, &LocalValue{v.Eval, key})
 	v.Values = append(v.Values, &LocalValue{v.Eval, value})
-
-	return nil
 }

 // PutBinary does a map assign operation.
-func (v *MapValue) PutBinary(keyPtr, valPtr *LocalValue) error {
+func (v *MapValue) PutBinary(keyPtr, valPtr *LocalValue) {
 	if !v.Underlying.IsNil() {
-		return errors.New("map already created")
+		panic("map already created")
 	}
+	v.setKeyVariant("binary")

 	if valPtr.Underlying.Opcode() == llvm.BitCast {
 		valPtr = &LocalValue{v.Eval, valPtr.Underlying.Operand(0)}
 	}
-	value, err := valPtr.Load()
-	if err != nil {
-		return err
-	}
+	value := valPtr.Load()
 	if v.ValueType.IsNil() {
 		v.ValueType = value.Type()
 		if int(v.Eval.TargetData.TypeAllocSize(v.ValueType)) != v.ValueSize {
-			return errors.New("interp: map store value type has the wrong size")
+			panic("interp: map store value type has the wrong size")
 		}
 	} else {
 		if value.Type() != v.ValueType {
-			return errors.New("interp: map store value type is inconsistent")
+			panic("interp: map store value type is inconsistent")
 		}
 	}

@@ -394,26 +405,21 @@ func (v *MapValue) PutBinary(keyPtr, valPtr *LocalValue) error {
 			keyPtr = &LocalValue{v.Eval, keyPtr.Underlying.Operand(0)}
 		}
 	}
-	key, err := keyPtr.Load()
-	if err != nil {
-		return err
-	}
+	key := keyPtr.Load()
 	if v.KeyType.IsNil() {
 		v.KeyType = key.Type()
 		if int(v.Eval.TargetData.TypeAllocSize(v.KeyType)) != v.KeySize {
-			return errors.New("interp: map store key type has the wrong size")
+			panic("interp: map store key type has the wrong size")
 		}
 	} else {
 		if key.Type() != v.KeyType {
-			return errors.New("interp: map store key type is inconsistent")
+			panic("interp: map store key type is inconsistent")
 		}
 	}

 	// TODO: avoid duplicate keys
 	v.Keys = append(v.Keys, &LocalValue{v.Eval, key})
 	v.Values = append(v.Values, &LocalValue{v.Eval, value})
-
-	return nil
 }

 // Get FNV-1a hash of this string.
@@ -1,271 +0,0 @@
-package ir
-
-import (
-	"go/ast"
-	"go/types"
-	"sort"
-	"strings"
-
-	"github.com/tinygo-org/tinygo/loader"
-	"golang.org/x/tools/go/ssa"
-	"tinygo.org/x/go-llvm"
-)
-
-// This file provides a wrapper around go/ssa values and adds extra
-// functionality to them.
-
-// View on all functions, types, and globals in a program, with analysis
-// results.
-type Program struct {
-	Program       *ssa.Program
-	LoaderProgram *loader.Program
-	mainPkg       *ssa.Package
-	Functions     []*Function
-	functionMap   map[*ssa.Function]*Function
-}
-
-// Function or method.
-type Function struct {
-	*ssa.Function
-	LLVMFn   llvm.Value
-	module   string     // go:wasm-module
-	linkName string     // go:linkname, go:export
-	exported bool       // go:export
-	nobounds bool       // go:nobounds
-	flag     bool       // used by dead code elimination
-	inline   InlineType // go:inline
-}
-
-// Interface type that is at some point used in a type assert (to check whether
-// it implements another interface).
-type Interface struct {
-	Num  int
-	Type *types.Interface
-}
-
-type InlineType int
-
-// How much to inline.
-const (
-	// Default behavior. The compiler decides for itself whether any given
-	// function will be inlined. Whether any function is inlined depends on the
-	// optimization level.
-	InlineDefault InlineType = iota
-
-	// Inline hint, just like the C inline keyword (signalled using
-	// //go:inline). The compiler will be more likely to inline this function,
-	// but it is not a guarantee.
-	InlineHint
-
-	// Don't inline, just like the GCC noinline attribute. Signalled using
-	// //go:noinline.
-	InlineNone
-)
-
-// Create and initialize a new *Program from a *ssa.Program.
-func NewProgram(lprogram *loader.Program) *Program {
-	program := lprogram.LoadSSA()
-	program.Build()
-
-	mainPkg := program.ImportedPackage(lprogram.MainPkg().ImportPath)
-	if mainPkg == nil {
-		panic("could not find main package")
-	}
-	p := &Program{
-		Program:       program,
-		LoaderProgram: lprogram,
-		mainPkg:       mainPkg,
-		functionMap:   make(map[*ssa.Function]*Function),
-	}
-
-	for _, pkg := range lprogram.Sorted() {
-		p.AddPackage(program.ImportedPackage(pkg.ImportPath))
-	}
-
-	return p
-}
-
-// Add a package to this Program. All packages need to be added first before any
-// analysis is done for correct results.
-func (p *Program) AddPackage(pkg *ssa.Package) {
-	memberNames := make([]string, 0)
-	for name := range pkg.Members {
-		memberNames = append(memberNames, name)
-	}
-	sort.Strings(memberNames)
-
-	for _, name := range memberNames {
-		member := pkg.Members[name]
-		switch member := member.(type) {
-		case *ssa.Function:
-			p.addFunction(member)
-		case *ssa.Type:
-			methods := getAllMethods(pkg.Prog, member.Type())
-			if !types.IsInterface(member.Type()) {
-				// named type
-				for _, method := range methods {
-					p.addFunction(pkg.Prog.MethodValue(method))
-				}
-			}
-		case *ssa.Global:
-			// Ignore. Globals are not handled here.
-		case *ssa.NamedConst:
-			// Ignore: these are already resolved.
-		default:
-			panic("unknown member type: " + member.String())
-		}
-	}
-}
-
-func (p *Program) addFunction(ssaFn *ssa.Function) {
-	if _, ok := p.functionMap[ssaFn]; ok {
-		return
-	}
-	f := &Function{Function: ssaFn}
-	f.parsePragmas()
-	p.Functions = append(p.Functions, f)
-	p.functionMap[ssaFn] = f
-
-	for _, anon := range ssaFn.AnonFuncs {
-		p.addFunction(anon)
-	}
-}
-
-// Return true if this package imports "unsafe", false otherwise.
-func hasUnsafeImport(pkg *types.Package) bool {
-	for _, imp := range pkg.Imports() {
-		if imp == types.Unsafe {
-			return true
-		}
-	}
-	return false
-}
-
-func (p *Program) GetFunction(ssaFn *ssa.Function) *Function {
-	return p.functionMap[ssaFn]
-}
-
-func (p *Program) MainPkg() *ssa.Package {
-	return p.mainPkg
-}
-
-// Parse compiler directives in the preceding comments.
-func (f *Function) parsePragmas() {
-	if f.Syntax() == nil {
-		return
-	}
-	if decl, ok := f.Syntax().(*ast.FuncDecl); ok && decl.Doc != nil {
-		for _, comment := range decl.Doc.List {
-			text := comment.Text
-			if strings.HasPrefix(text, "//export ") {
-				// Rewrite '//export' to '//go:export' for compatibility with
-				// gc.
-				text = "//go:" + text[2:]
-			}
-			if !strings.HasPrefix(text, "//go:") {
-				continue
-			}
-			parts := strings.Fields(text)
-			switch parts[0] {
-			case "//go:export":
-				if len(parts) != 2 {
-					continue
-				}
-				f.linkName = parts[1]
-				f.exported = true
-			case "//go:wasm-module":
-				// Alternative comment for setting the import module.
-				if len(parts) != 2 {
-					continue
-				}
-				f.module = parts[1]
-			case "//go:inline":
-				f.inline = InlineHint
-			case "//go:noinline":
-				f.inline = InlineNone
-			case "//go:linkname":
-				if len(parts) != 3 || parts[1] != f.Name() {
-					continue
-				}
-				// Only enable go:linkname when the package imports "unsafe".
-				// This is a slightly looser requirement than what gc uses: gc
-				// requires the file to import "unsafe", not the package as a
-				// whole.
-				if hasUnsafeImport(f.Pkg.Pkg) {
-					f.linkName = parts[2]
-				}
-			case "//go:nobounds":
-				// Skip bounds checking in this function. Useful for some
-				// runtime functions.
-				// This is somewhat dangerous and thus only imported in packages
-				// that import unsafe.
-				if hasUnsafeImport(f.Pkg.Pkg) {
-					f.nobounds = true
-				}
-			}
-		}
-	}
-}
-
-func (f *Function) IsNoBounds() bool {
-	return f.nobounds
-}
-
-// Return true iff this function is externally visible.
-func (f *Function) IsExported() bool {
-	return f.exported || f.CName() != ""
-}
-
-// Return the inline directive of this function.
-func (f *Function) Inline() InlineType {
-	return f.inline
-}
-
-// Return the module name if not the default.
-func (f *Function) Module() string {
-	return f.module
-}
-
-// Return the link name for this function.
-func (f *Function) LinkName() string {
-	if f.linkName != "" {
-		return f.linkName
-	}
-	if f.Signature.Recv() != nil {
-		// Method on a defined type (which may be a pointer).
-		return f.RelString(nil)
-	} else {
-		// Bare function.
-		if name := f.CName(); name != "" {
-			// Name CGo functions directly.
-			return name
-		} else {
-			return f.RelString(nil)
-		}
-	}
-}
-
-// Return the name of the C function if this is a CGo wrapper. Otherwise, return
-// a zero-length string.
-func (f *Function) CName() string {
-	name := f.Name()
-	if strings.HasPrefix(name, "_Cfunc_") {
-		// emitted by `go tool cgo`
-		return name[len("_Cfunc_"):]
-	}
-	if strings.HasPrefix(name, "C.") {
-		// created by ../loader/cgo.go
-		return name[2:]
-	}
-	return ""
-}
-
-// Get all methods of a type.
-func getAllMethods(prog *ssa.Program, typ types.Type) []*types.Selection {
-	ms := prog.MethodSets.MethodSet(typ)
-	methods := make([]*types.Selection, ms.Len())
-	for i := 0; i < ms.Len(); i++ {
-		methods[i] = ms.At(i)
-	}
-	return methods
-}
@@ -1,149 +0,0 @@
-package ir
-
-import (
-	"errors"
-	"go/types"
-
-	"golang.org/x/tools/go/ssa"
-)
-
-// This file implements several optimization passes (analysis + transform) to
-// optimize code in SSA form before it is compiled to LLVM IR. It is based on
-// the IR defined in ir.go.
-
-// Make a readable version of a method signature (including the function name,
-// excluding the receiver name). This string is used internally to match
-// interfaces and to call the correct method on an interface. Examples:
-//
-//     String() string
-//     Read([]byte) (int, error)
-func MethodSignature(method *types.Func) string {
-	return method.Name() + signature(method.Type().(*types.Signature))
-}
-
-// Make a readable version of a function (pointer) signature.
-// Examples:
-//
-//     () string
-//     (string, int) (int, error)
-func signature(sig *types.Signature) string {
-	s := ""
-	if sig.Params().Len() == 0 {
-		s += "()"
-	} else {
-		s += "("
-		for i := 0; i < sig.Params().Len(); i++ {
-			if i > 0 {
-				s += ", "
-			}
-			s += sig.Params().At(i).Type().String()
-		}
-		s += ")"
-	}
-	if sig.Results().Len() == 0 {
-		// keep as-is
-	} else if sig.Results().Len() == 1 {
-		s += " " + sig.Results().At(0).Type().String()
-	} else {
-		s += " ("
-		for i := 0; i < sig.Results().Len(); i++ {
-			if i > 0 {
-				s += ", "
-			}
-			s += sig.Results().At(i).Type().String()
-		}
-		s += ")"
-	}
-	return s
-}
-
-// Simple pass that removes dead code. This pass makes later analysis passes
-// more useful.
-func (p *Program) SimpleDCE() error {
-	// Unmark all functions.
-	for _, f := range p.Functions {
-		f.flag = false
-	}
-
-	// Initial set of live functions. Include main.main, *.init and runtime.*
-	// functions.
-	main, ok := p.mainPkg.Members["main"].(*ssa.Function)
-	if !ok {
-		if p.mainPkg.Members["main"] == nil {
-			return errors.New("function main is undeclared in the main package")
-		} else {
-			return errors.New("cannot declare main - must be func")
-		}
-	}
-	runtimePkg := p.Program.ImportedPackage("runtime")
-	mathPkg := p.Program.ImportedPackage("math")
-	taskPkg := p.Program.ImportedPackage("internal/task")
-	p.GetFunction(main).flag = true
-	worklist := []*ssa.Function{main}
-	for _, f := range p.Functions {
-		if f.exported || f.Synthetic == "package initializer" || f.Pkg == runtimePkg || f.Pkg == taskPkg || (f.Pkg == mathPkg && f.Pkg != nil) {
-			if f.flag {
-				continue
-			}
-			f.flag = true
-			worklist = append(worklist, f.Function)
-		}
-	}
-
-	// Mark all called functions recursively.
-	for len(worklist) != 0 {
-		f := worklist[len(worklist)-1]
-		worklist = worklist[:len(worklist)-1]
-		for _, block := range f.Blocks {
-			for _, instr := range block.Instrs {
-				if instr, ok := instr.(*ssa.MakeInterface); ok {
-					for _, sel := range getAllMethods(p.Program, instr.X.Type()) {
-						fn := p.Program.MethodValue(sel)
-						callee := p.GetFunction(fn)
-						if callee == nil {
-							// TODO: why is this necessary?
-							p.addFunction(fn)
-							callee = p.GetFunction(fn)
-						}
-						if !callee.flag {
-							callee.flag = true
-							worklist = append(worklist, callee.Function)
-						}
-					}
-				}
-				for _, operand := range instr.Operands(nil) {
-					if operand == nil || *operand == nil {
-						continue
-					}
-					switch operand := (*operand).(type) {
-					case *ssa.Function:
-						f := p.GetFunction(operand)
-						if f == nil {
-							// FIXME HACK: this function should have been
-							// discovered already. It is not for bound methods.
-							p.addFunction(operand)
-							f = p.GetFunction(operand)
-						}
-						if !f.flag {
-							f.flag = true
-							worklist = append(worklist, operand)
-						}
-					}
-				}
-			}
-		}
-	}
-
-	// Remove unmarked functions.
-	livefunctions := []*Function{}
-	for _, f := range p.Functions {
-		if f.flag {
-			livefunctions = append(livefunctions, f)
-		} else {
-			delete(p.functionMap, f.Function)
-		}
-	}
-	p.Functions = livefunctions
-
-	return nil
-}
@@ -1,6 +1,9 @@
 package loader

-import "go/scanner"
+import (
+	"go/token"
+	"strings"
+)

 // Errors contains a list of parser errors or a list of typechecker errors for
 // the given package.
@@ -13,13 +16,24 @@ func (e Errors) Error() string {
 	return "could not compile: " + e.Errs[0].Error()
 }

-// Error is a regular error but with an added import stack. This is especially
-// useful for debugging import cycle errors.
-type Error struct {
-	ImportStack []string
-	Err         scanner.Error
+// ImportCycleErrors is returned when encountering an import cycle. The list of
+// packages is a list from the root package to the leaf package that imports one
+// of the packages in the list.
+type ImportCycleError struct {
+	Packages        []string
+	ImportPositions []token.Position
 }

-func (e Error) Error() string {
-	return e.Err.Error()
+func (e *ImportCycleError) Error() string {
+	var msg strings.Builder
+	msg.WriteString("import cycle:\n\t")
+	msg.WriteString(strings.Join(e.Packages, "\n\t"))
+	msg.WriteString("\n at ")
+	for i, pos := range e.ImportPositions {
+		if i > 0 {
+			msg.WriteString(", ")
+		}
+		msg.WriteString(pos.String())
+	}
+	return msg.String()
 }
@@ -1,281 +0,0 @@
-package loader
-
-// This file constructs a new temporary GOROOT directory by merging both the
-// standard Go GOROOT and the GOROOT from TinyGo using symlinks.
-
-import (
-	"crypto/sha512"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path"
-	"path/filepath"
-	"runtime"
-	"sync"
-
-	"github.com/tinygo-org/tinygo/compileopts"
-	"github.com/tinygo-org/tinygo/goenv"
-)
-
-var gorootCreateMutex sync.Mutex
-
-// GetCachedGoroot creates a new GOROOT by merging both the standard GOROOT and
-// the GOROOT from TinyGo using lots of symbolic links.
-func GetCachedGoroot(config *compileopts.Config) (string, error) {
-	goroot := goenv.Get("GOROOT")
-	if goroot == "" {
-		return "", errors.New("could not determine GOROOT")
-	}
-	tinygoroot := goenv.Get("TINYGOROOT")
-	if tinygoroot == "" {
-		return "", errors.New("could not determine TINYGOROOT")
-	}
-
-	// Determine the location of the cached GOROOT.
-	version, err := goenv.GorootVersionString(goroot)
-	if err != nil {
-		return "", err
-	}
-	// This hash is really a cache key, that contains (hopefully) enough
-	// information to make collisions unlikely during development.
-	// By including the Go version and TinyGo version, cache collisions should
-	// not happen outside of development.
-	hash := sha512.New512_256()
-	fmt.Fprintln(hash, goroot)
-	fmt.Fprintln(hash, version)
-	fmt.Fprintln(hash, goenv.Version)
-	fmt.Fprintln(hash, tinygoroot)
-	gorootsHash := hash.Sum(nil)
-	gorootsHashHex := hex.EncodeToString(gorootsHash[:])
-	cachedgorootName := "goroot-" + version + "-" + gorootsHashHex
-	cachedgoroot := filepath.Join(goenv.Get("GOCACHE"), cachedgorootName)
-	if needsSyscallPackage(config.BuildTags()) {
-		cachedgoroot += "-syscall"
-	}
-
-	// Do not try to create the cached GOROOT in parallel, that's only a waste
-	// of I/O bandwidth and thus speed. Instead, use a mutex to make sure only
-	// one goroutine does it at a time.
-	// This is not a way to ensure atomicity (a different TinyGo invocation
-	// could be creating the same directory), but instead a way to avoid
-	// creating it many times in parallel when running tests in parallel.
-	gorootCreateMutex.Lock()
-	defer gorootCreateMutex.Unlock()
-
-	if _, err := os.Stat(cachedgoroot); err == nil {
-		return cachedgoroot, nil
-	}
-	err = os.MkdirAll(goenv.Get("GOCACHE"), 0777)
-	if err != nil {
-		return "", err
-	}
-	tmpgoroot, err := ioutil.TempDir(goenv.Get("GOCACHE"), cachedgorootName+".tmp")
-	if err != nil {
-		return "", err
-	}
-
-	// Remove the temporary directory if it wasn't moved to the right place
-	// (for example, when there was an error).
-	defer os.RemoveAll(tmpgoroot)
-
-	for _, name := range []string{"bin", "lib", "pkg"} {
-		err = symlink(filepath.Join(goroot, name), filepath.Join(tmpgoroot, name))
-		if err != nil {
-			return "", err
-		}
-	}
-	err = mergeDirectory(goroot, tinygoroot, tmpgoroot, "", pathsToOverride(needsSyscallPackage(config.BuildTags())))
-	if err != nil {
-		return "", err
-	}
-	err = os.Rename(tmpgoroot, cachedgoroot)
-	if err != nil {
-		if os.IsExist(err) {
-			// Another invocation of TinyGo also seems to have created a GOROOT.
-			// Use that one instead. Our new GOROOT will be automatically
-			// deleted by the defer above.
-			return cachedgoroot, nil
-		}
-		if runtime.GOOS == "windows" && os.IsPermission(err) {
-			// On Windows, a rename with a destination directory that already
-			// exists does not result in an IsExist error, but rather in an
-			// access denied error. To be sure, check for this case by checking
-			// whether the target directory exists.
-			if _, err := os.Stat(cachedgoroot); err == nil {
-				return cachedgoroot, nil
-			}
-		}
-		return "", err
-	}
-	return cachedgoroot, nil
-}
-
-// mergeDirectory merges two roots recursively. The tmpgoroot is the directory
-// that will be created by this call by either symlinking the directory from
-// goroot or tinygoroot, or by creating the directory and merging the contents.
-func mergeDirectory(goroot, tinygoroot, tmpgoroot, importPath string, overrides map[string]bool) error {
-	if mergeSubdirs, ok := overrides[importPath+"/"]; ok {
-		if !mergeSubdirs {
-			// This directory and all subdirectories should come from the TinyGo
-			// root, so simply make a symlink.
-			newname := filepath.Join(tmpgoroot, "src", importPath)
-			oldname := filepath.Join(tinygoroot, "src", importPath)
-			return symlink(oldname, newname)
-		}
-
-		// Merge subdirectories. Start by making the directory to merge.
-		err := os.Mkdir(filepath.Join(tmpgoroot, "src", importPath), 0777)
-		if err != nil {
-			return err
-		}
-
-		// Symlink all files from TinyGo, and symlink directories from TinyGo
-		// that need to be overridden.
-		tinygoEntries, err := ioutil.ReadDir(filepath.Join(tinygoroot, "src", importPath))
-		if err != nil {
-			return err
-		}
-		for _, e := range tinygoEntries {
-			if e.IsDir() {
-				// A directory, so merge this thing.
-				err := mergeDirectory(goroot, tinygoroot, tmpgoroot, path.Join(importPath, e.Name()), overrides)
-				if err != nil {
-					return err
-				}
-			} else {
-				// A file, so symlink this.
-				newname := filepath.Join(tmpgoroot, "src", importPath, e.Name())
-				oldname := filepath.Join(tinygoroot, "src", importPath, e.Name())
-				err := symlink(oldname, newname)
-				if err != nil {
-					return err
-				}
-			}
-		}
-
-		// Symlink all directories from $GOROOT that are not part of the TinyGo
-		// overrides.
-		gorootEntries, err := ioutil.ReadDir(filepath.Join(goroot, "src", importPath))
-		if err != nil {
-			return err
-		}
-		for _, e := range gorootEntries {
-			if !e.IsDir() {
-				// Don't merge in files from Go. Otherwise we'd end up with a
-				// weird syscall package with files from both roots.
-				continue
-			}
-			if _, ok := overrides[path.Join(importPath, e.Name())+"/"]; ok {
-				// Already included above, so don't bother trying to create this
-				// symlink.
-				continue
-			}
-			newname := filepath.Join(tmpgoroot, "src", importPath, e.Name())
-			oldname := filepath.Join(goroot, "src", importPath, e.Name())
-			err := symlink(oldname, newname)
-			if err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
-// needsSyscallPackage returns whether the syscall package should be overriden
-// with the TinyGo version. This is the case on some targets.
-func needsSyscallPackage(buildTags []string) bool {
-	for _, tag := range buildTags {
-		if tag == "baremetal" || tag == "darwin" || tag == "nintendoswitch" || tag == "wasi" {
-			return true
-		}
-	}
-	return false
-}
-
-// The boolean indicates whether to merge the subdirs. True means merge, false
-// means use the TinyGo version.
-func pathsToOverride(needsSyscallPackage bool) map[string]bool {
-	paths := map[string]bool{
-		"/":                     true,
-		"device/":               false,
-		"examples/":             false,
-		"internal/":             true,
-		"internal/bytealg/":     false,
-		"internal/reflectlite/": false,
-		"internal/task/":        false,
-		"machine/":              false,
-		"os/":                   true,
-		"reflect/":              false,
-		"runtime/":              false,
-		"sync/":                 true,
-		"testing/":              true,
-	}
-	if needsSyscallPackage {
-		paths["syscall/"] = true // include syscall/js
-	}
-	return paths
-}
-
-// symlink creates a symlink or something similar. On Unix-like systems, it
-// always creates a symlink. On Windows, it tries to create a symlink and if
-// that fails, creates a hardlink or directory junction instead.
-//
-// Note that while Windows 10 does support symlinks and allows them to be
-// created using os.Symlink, it requires developer mode to be enabled.
-// Therefore provide a fallback for when symlinking is not possible.
-// Unfortunately this fallback only works when TinyGo is installed on the same
-// filesystem as the TinyGo cache and the Go installation (which is usually the
-// C drive).
-func symlink(oldname, newname string) error {
-	symlinkErr := os.Symlink(oldname, newname)
-	if runtime.GOOS == "windows" && symlinkErr != nil {
-		// Fallback for when developer mode is disabled.
-		// Note that we return the symlink error even if something else fails
-		// later on. This is because symlinks are the easiest to support
-		// (they're also used on Linux and MacOS) and enabling them is easy:
-		// just enable developer mode.
-		st, err := os.Stat(oldname)
-		if err != nil {
-			return symlinkErr
-		}
-		if st.IsDir() {
-			// Make a directory junction. There may be a way to do this
-			// programmatically, but it involves a lot of magic. Use the mklink
-			// command built into cmd instead (mklink is a builtin, not an
-			// external command).
-			err := exec.Command("cmd", "/k", "mklink", "/J", newname, oldname).Run()
-			if err != nil {
-				return symlinkErr
-			}
-		} else {
-			// Try making a hard link.
-			err := os.Link(oldname, newname)
-			if err != nil {
-				// Making a hardlink failed. Try copying the file as a last
-				// fallback.
-				inf, err := os.Open(oldname)
-				if err != nil {
-					return err
-				}
-				defer inf.Close()
-				outf, err := os.Create(newname)
-				if err != nil {
-					return err
-				}
-				defer outf.Close()
-				_, err = io.Copy(outf, inf)
-				if err != nil {
-					os.Remove(newname)
-					return err
-				}
-				// File was copied.
-			}
-		}
-		return nil // success
-	}
-	return symlinkErr
-}
@@ -1,30 +0,0 @@
-package loader
-
-import (
-	"os"
-	"os/exec"
-	"strings"
-
-	"github.com/tinygo-org/tinygo/compileopts"
-)
-
-// List returns a ready-to-run *exec.Cmd for running the `go list` command with
-// the configuration used for TinyGo.
-func List(config *compileopts.Config, extraArgs, pkgs []string) (*exec.Cmd, error) {
-	goroot, err := GetCachedGoroot(config)
-	if err != nil {
-		return nil, err
-	}
-	args := append([]string{"list"}, extraArgs...)
-	if len(config.BuildTags()) != 0 {
-		args = append(args, "-tags", strings.Join(config.BuildTags(), " "))
-	}
-	args = append(args, pkgs...)
-	cgoEnabled := "0"
-	if config.CgoEnabled() {
-		cgoEnabled = "1"
-	}
-	cmd := exec.Command("go", args...)
-	cmd.Env = append(os.Environ(), "GOROOT="+goroot, "GOOS="+config.GOOS(), "GOARCH="+config.GOARCH(), "CGO_ENABLED="+cgoEnabled)
-	return cmd, nil
-}
@@ -2,273 +2,226 @@ package loader

 import (
 	"bytes"
-	"encoding/json"
 	"errors"
-	"fmt"
 	"go/ast"
+	"go/build"
 	"go/parser"
 	"go/scanner"
 	"go/token"
 	"go/types"
-	"io"
 	"os"
-	"os/exec"
 	"path/filepath"
-	"strconv"
+	"sort"
 	"strings"
-	"syscall"
+	"text/template"

 	"github.com/tinygo-org/tinygo/cgo"
-	"github.com/tinygo-org/tinygo/compileopts"
-	"github.com/tinygo-org/tinygo/goenv"
 )

 // Program holds all packages and some metadata about the program as a whole.
 type Program struct {
-	config       *compileopts.Config
-	clangHeaders string
-	typeChecker  types.Config
-	goroot       string // synthetic GOROOT
-	workingDir   string
-
-	Packages map[string]*Package
-	sorted   []*Package
-	fset     *token.FileSet
-
-	// Information obtained during parsing.
-	LDFlags []string
-}
-
-// PackageJSON is a subset of the JSON struct returned from `go list`.
-type PackageJSON struct {
-	Dir        string
-	ImportPath string
-	ForTest    string
-
-	// Source files
-	GoFiles  []string
-	CgoFiles []string
-	CFiles   []string
-
-	// Dependency information
-	Imports []string
-
-	// Error information
-	Error *struct {
-		ImportStack []string
-		Pos         string
-		Err         string
-	}
+	mainPkg      string
+	Build        *build.Context
+	OverlayBuild *build.Context
+	OverlayPath  func(path string) string
+	Packages     map[string]*Package
+	sorted       []*Package
+	fset         *token.FileSet
+	TypeChecker  types.Config
+	Dir          string // current working directory (for error reporting)
+	TINYGOROOT   string // root of the TinyGo installation or root of the source code
+	CFlags       []string
+	ClangHeaders string
 }

 // Package holds a loaded package, its imports, and its parsed files.
 type Package struct {
-	PackageJSON
-
-	program *Program
-	Files   []*ast.File
-	Pkg     *types.Package
-	info    types.Info
+	*Program
+	*build.Package
+	Imports   map[string]*Package
+	Importing bool
+	Files     []*ast.File
+	Pkg       *types.Package
+	types.Info
 }

-// Load loads the given package with all dependencies (including the runtime
-// package). Call .Parse() afterwards to parse all Go files (including CGo
-// processing, if necessary).
-func Load(config *compileopts.Config, inputPkgs []string, clangHeaders string, typeChecker types.Config) (*Program, error) {
-	goroot, err := GetCachedGoroot(config)
-	if err != nil {
-		return nil, err
-	}
-	wd, err := os.Getwd()
-	if err != nil {
-		return nil, err
-	}
-	p := &Program{
-		config:       config,
-		clangHeaders: clangHeaders,
-		typeChecker:  typeChecker,
-		goroot:       goroot,
-		workingDir:   wd,
-		Packages:     make(map[string]*Package),
-		fset:         token.NewFileSet(),
+// Import loads the given package relative to srcDir (for the vendor directory).
+// It only loads the current package without recursion.
+func (p *Program) Import(path, srcDir string, pos token.Position) (*Package, error) {
+	if p.Packages == nil {
+		p.Packages = make(map[string]*Package)
 	}

-	// List the dependencies of this package, in raw JSON format.
-	extraArgs := []string{"-json", "-deps"}
-	if config.TestConfig.CompileTestBinary {
-		extraArgs = append(extraArgs, "-test")
+	// Load this package.
+	ctx := p.Build
+	if newPath := p.OverlayPath(path); newPath != "" {
+		ctx = p.OverlayBuild
+		path = newPath
 	}
-	cmd, err := List(config, extraArgs, inputPkgs)
+	buildPkg, err := ctx.Import(path, srcDir, build.ImportComment)
 	if err != nil {
-		return nil, err
-	}
-	buf := &bytes.Buffer{}
-	cmd.Stdout = buf
-	cmd.Stderr = os.Stderr
-	err = cmd.Run()
-	if err != nil {
-		if exitErr, ok := err.(*exec.ExitError); ok {
-			if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
-				os.Exit(status.ExitStatus())
-			}
-			os.Exit(1)
+		return nil, scanner.Error{
+			Pos: pos,
+			Msg: err.Error(), // TODO: define a new error type that will wrap the inner error
 		}
-		return nil, fmt.Errorf("failed to run `go list`: %s", err)
+	}
+	if existingPkg, ok := p.Packages[buildPkg.ImportPath]; ok {
+		// Already imported, or at least started the import.
+		return existingPkg, nil
+	}
+	p.sorted = nil // invalidate the sorted order of packages
+	pkg := p.newPackage(buildPkg)
+	p.Packages[buildPkg.ImportPath] = pkg
+
+	if p.mainPkg == "" {
+		p.mainPkg = buildPkg.ImportPath
 	}

-	// Parse the returned json from `go list`.
-	decoder := json.NewDecoder(buf)
-	for {
-		pkg := &Package{
-			program: p,
-			info: types.Info{
-				Types:      make(map[ast.Expr]types.TypeAndValue),
-				Defs:       make(map[*ast.Ident]types.Object),
-				Uses:       make(map[*ast.Ident]types.Object),
-				Implicits:  make(map[ast.Node]types.Object),
-				Scopes:     make(map[ast.Node]*types.Scope),
-				Selections: make(map[*ast.SelectorExpr]*types.Selection),
-			},
-		}
-		err := decoder.Decode(&pkg.PackageJSON)
-		if err != nil {
-			if err == io.EOF {
-				break
-			}
-			return nil, err
-		}
-		if pkg.Error != nil {
-			// There was an error while importing (for example, a circular
-			// dependency).
-			pos := token.Position{}
-			fields := strings.Split(pkg.Error.Pos, ":")
-			if len(fields) >= 2 {
-				// There is some file/line/column information.
-				if n, err := strconv.Atoi(fields[len(fields)-2]); err == nil {
-					// Format: filename.go:line:colum
-					pos.Filename = strings.Join(fields[:len(fields)-2], ":")
-					pos.Line = n
-					pos.Column, _ = strconv.Atoi(fields[len(fields)-1])
-				} else {
-					// Format: filename.go:line
-					pos.Filename = strings.Join(fields[:len(fields)-1], ":")
-					pos.Line, _ = strconv.Atoi(fields[len(fields)-1])
-				}
-				pos.Filename = p.getOriginalPath(pos.Filename)
-			}
-			err := scanner.Error{
-				Pos: pos,
-				Msg: pkg.Error.Err,
-			}
-			if len(pkg.Error.ImportStack) != 0 {
-				return nil, Error{
-					ImportStack: pkg.Error.ImportStack,
-					Err:         err,
-				}
-			}
-			return nil, err
-		}
-		if config.TestConfig.CompileTestBinary {
-			// When creating a test binary, `go list` will list two or three
-			// packages used for testing the package. The first is the original
-			// package as if it were built normally, the second is the same
-			// package but with the *_test.go files included. A possible third
-			// may be included for _test packages (such as math_test), used to
-			// test the external API with no access to internal functions.
-			// All packages that are necessary for testing (including the to be
-			// tested package with *_test.go files, but excluding the original
-			// unmodified package) have a suffix added to the import path, for
-			// example the math package has import path "math [math.test]" and
-			// test dependencies such as fmt will have an import path of the
-			// form "fmt [math.test]".
-			// The code below removes this suffix, and if this results in a
-			// duplicate (which happens with the to-be-tested package without
-			// *.test.go files) the previous package is removed from the list of
-			// packages included in this build.
-			// This is necessary because the change in import paths results in
-			// breakage to //go:linkname. Additionally, the duplicated package
-			// slows down the build and so is best removed.
-			if pkg.ForTest != "" && strings.HasSuffix(pkg.ImportPath, " ["+pkg.ForTest+".test]") {
-				newImportPath := pkg.ImportPath[:len(pkg.ImportPath)-len(" ["+pkg.ForTest+".test]")]
-				if _, ok := p.Packages[newImportPath]; ok {
-					// Delete the previous package (that this package overrides).
-					delete(p.Packages, newImportPath)
-					for i, pkg := range p.sorted {
-						if pkg.ImportPath == newImportPath {
-							p.sorted = append(p.sorted[:i], p.sorted[i+1:]...) // remove element from slice
-							break
-						}
-					}
-				}
-				pkg.ImportPath = newImportPath
-			}
-		}
-		p.sorted = append(p.sorted, pkg)
-		p.Packages[pkg.ImportPath] = pkg
-	}
-
-	return p, nil
+	return pkg, nil
 }

-// getOriginalPath looks whether this path is in the generated GOROOT and if so,
-// replaces the path with the original path (in GOROOT or TINYGOROOT). Otherwise
-// the input path is returned.
-func (p *Program) getOriginalPath(path string) string {
-	originalPath := path
-	if strings.HasPrefix(path, p.goroot+string(filepath.Separator)) {
-		// If this file is part of the synthetic GOROOT, try to infer the
-		// original path.
-		relpath := path[len(filepath.Join(p.goroot, "src"))+1:]
-		realgorootPath := filepath.Join(goenv.Get("GOROOT"), "src", relpath)
-		if _, err := os.Stat(realgorootPath); err == nil {
-			originalPath = realgorootPath
-		}
-		maybeInTinyGoRoot := false
-		for prefix := range pathsToOverride(needsSyscallPackage(p.config.BuildTags())) {
-			if !strings.HasPrefix(relpath, prefix) {
-				continue
-			}
-			maybeInTinyGoRoot = true
-		}
-		if maybeInTinyGoRoot {
-			tinygoPath := filepath.Join(goenv.Get("TINYGOROOT"), "src", relpath)
-			if _, err := os.Stat(tinygoPath); err == nil {
-				originalPath = tinygoPath
-			}
-		}
+// ImportFile loads and parses the import statements in the given path and
+// creates a pseudo-package out of it.
+func (p *Program) ImportFile(path string) (*Package, error) {
+	if p.Packages == nil {
+		p.Packages = make(map[string]*Package)
+	}
+	if _, ok := p.Packages[path]; ok {
+		// unlikely
+		return nil, errors.New("loader: cannot import file that is already imported as package: " + path)
+	}
+
+	file, err := p.parseFile(path, parser.ImportsOnly)
+	if err != nil {
+		return nil, err
+	}
+	buildPkg := &build.Package{
+		Dir:        filepath.Dir(path),
+		ImportPath: path,
+		GoFiles:    []string{filepath.Base(path)},
+	}
+	for _, importSpec := range file.Imports {
+		buildPkg.Imports = append(buildPkg.Imports, importSpec.Path.Value[1:len(importSpec.Path.Value)-1])
+	}
+	p.sorted = nil // invalidate the sorted order of packages
+	pkg := p.newPackage(buildPkg)
+	p.Packages[buildPkg.ImportPath] = pkg
+
+	if p.mainPkg == "" {
+		p.mainPkg = buildPkg.ImportPath
+	}
+
+	return pkg, nil
+}
+
+// newPackage instantiates a new *Package object with initialized members.
+func (p *Program) newPackage(pkg *build.Package) *Package {
+	return &Package{
+		Program: p,
+		Package: pkg,
+		Imports: make(map[string]*Package, len(pkg.Imports)),
+		Info: types.Info{
+			Types:      make(map[ast.Expr]types.TypeAndValue),
+			Defs:       make(map[*ast.Ident]types.Object),
+			Uses:       make(map[*ast.Ident]types.Object),
+			Implicits:  make(map[ast.Node]types.Object),
+			Scopes:     make(map[ast.Node]*types.Scope),
+			Selections: make(map[*ast.SelectorExpr]*types.Selection),
+		},
 	}
-	return originalPath
 }

 // Sorted returns a list of all packages, sorted in a way that no packages come
 // before the packages they depend upon.
 func (p *Program) Sorted() []*Package {
+	if p.sorted == nil {
+		p.sort()
+	}
 	return p.sorted
 }

-// MainPkg returns the last package in the Sorted() slice. This is the main
-// package of the program.
-func (p *Program) MainPkg() *Package {
-	return p.sorted[len(p.sorted)-1]
+func (p *Program) sort() {
+	p.sorted = nil
+	packageList := make([]*Package, 0, len(p.Packages))
+	packageSet := make(map[string]struct{}, len(p.Packages))
+	worklist := make([]string, 0, len(p.Packages))
+	for path := range p.Packages {
+		worklist = append(worklist, path)
+	}
+	sort.Strings(worklist)
+	for len(worklist) != 0 {
+		pkgPath := worklist[0]
+		pkg := p.Packages[pkgPath]
+
+		if _, ok := packageSet[pkgPath]; ok {
+			// Package already in the final package list.
+			worklist = worklist[1:]
+			continue
+		}
+
+		unsatisfiedImports := make([]string, 0)
+		for _, pkg := range pkg.Imports {
+			if _, ok := packageSet[pkg.ImportPath]; ok {
+				continue
+			}
+			unsatisfiedImports = append(unsatisfiedImports, pkg.ImportPath)
+		}
+		sort.Strings(unsatisfiedImports)
+		if len(unsatisfiedImports) == 0 {
+			// All dependencies of this package are satisfied, so add this
+			// package to the list.
+			packageList = append(packageList, pkg)
+			packageSet[pkgPath] = struct{}{}
+			worklist = worklist[1:]
+		} else {
+			// Prepend all dependencies to the worklist and reconsider this
+			// package (by not removing it from the worklist). At that point, it
+			// must be possible to add it to packageList.
+			worklist = append(unsatisfiedImports, worklist...)
+		}
+	}
+
+	p.sorted = packageList
 }

-// Parse parses all packages and typechecks them.
+// Parse recursively imports all packages, parses them, and typechecks them.
 //
 // The returned error may be an Errors error, which contains a list of errors.
 //
 // Idempotent.
-func (p *Program) Parse() error {
+func (p *Program) Parse(compileTestBinary bool) error {
+	includeTests := compileTestBinary
+
+	// Load all imports
+	for _, pkg := range p.Sorted() {
+		err := pkg.importRecursively(includeTests)
+		if err != nil {
+			if err, ok := err.(*ImportCycleError); ok {
+				if pkg.ImportPath != err.Packages[0] {
+					err.Packages = append([]string{pkg.ImportPath}, err.Packages...)
+				}
+			}
+			return err
+		}
+	}
+
 	// Parse all packages.
-	// TODO: do this in parallel.
-	for _, pkg := range p.sorted {
-		err := pkg.Parse()
+	for _, pkg := range p.Sorted() {
+		err := pkg.Parse(includeTests)
+		if err != nil {
+			return err
+		}
+	}
+
+	if compileTestBinary {
+		err := p.SwapTestMain()
 		if err != nil {
 			return err
 		}
 	}

 	// Typecheck all packages.
-	for _, pkg := range p.sorted {
+	for _, pkg := range p.Sorted() {
 		err := pkg.Check()
 		if err != nil {
 			return err
@@ -278,6 +231,83 @@ func (p *Program) Parse() error {
 	return nil
 }

+func (p *Program) SwapTestMain() error {
+	var tests []string
+
+	isTestFunc := func(f *ast.FuncDecl) bool {
+		// TODO: improve signature check
+		if strings.HasPrefix(f.Name.Name, "Test") && f.Name.Name != "TestMain" {
+			return true
+		}
+		return false
+	}
+	mainPkg := p.Packages[p.mainPkg]
+	for _, f := range mainPkg.Files {
+		for i, d := range f.Decls {
+			switch v := d.(type) {
+			case *ast.FuncDecl:
+				if isTestFunc(v) {
+					tests = append(tests, v.Name.Name)
+				}
+				if v.Name.Name == "main" {
+					// Remove main
+					if len(f.Decls) == 1 {
+						f.Decls = make([]ast.Decl, 0)
+					} else {
+						f.Decls[i] = f.Decls[len(f.Decls)-1]
+						f.Decls = f.Decls[:len(f.Decls)-1]
+					}
+				}
+			}
+		}
+	}
+
+	// TODO: Check if they defined a TestMain and call it instead of testing.TestMain
+	const mainBody = `package main
+
+import (
+	"testing"
+)
+
+func main () {
+	m := &testing.M{
+		Tests: []testing.TestToCall{
+{{range .TestFunctions}}
+			{Name: "{{.}}", Func: {{.}}},
+{{end}}
+		},
+	}
+
+	testing.TestMain(m)
+}
+`
+	tmpl := template.Must(template.New("testmain").Parse(mainBody))
+	b := bytes.Buffer{}
+	tmplData := struct {
+		TestFunctions []string
+	}{
+		TestFunctions: tests,
+	}
+
+	err := tmpl.Execute(&b, tmplData)
+	if err != nil {
+		return err
+	}
+	path := filepath.Join(p.mainPkg, "$testmain.go")
+
+	if p.fset == nil {
+		p.fset = token.NewFileSet()
+	}
+
+	newMain, err := parser.ParseFile(p.fset, path, b.Bytes(), parser.AllErrors)
+	if err != nil {
+		return err
+	}
+	mainPkg.Files = append(mainPkg.Files, newMain)
+
+	return nil
+}
+
 // parseFile is a wrapper around parser.ParseFile.
 func (p *Program) parseFile(path string, mode parser.Mode) (*ast.File, error) {
 	if p.fset == nil {
@@ -289,26 +319,34 @@ func (p *Program) parseFile(path string, mode parser.Mode) (*ast.File, error) {
 		return nil, err
 	}
 	defer rd.Close()
-	return parser.ParseFile(p.fset, p.getOriginalPath(path), rd, mode)
+	relpath := path
+	if filepath.IsAbs(path) {
+		rp, err := filepath.Rel(p.Dir, path)
+		if err == nil {
+			relpath = rp
+		}
+	}
+	return parser.ParseFile(p.fset, relpath, rd, mode)
 }

 // Parse parses and typechecks this package.
 //
 // Idempotent.
-func (p *Package) Parse() error {
+func (p *Package) Parse(includeTests bool) error {
 	if len(p.Files) != 0 {
-		return nil // nothing to do (?)
+		return nil
 	}

 	// Load the AST.
+	// TODO: do this in parallel.
 	if p.ImportPath == "unsafe" {
-		// Special case for the unsafe package, which is defined internally by
-		// the types package.
+		// Special case for the unsafe package. Don't even bother loading
+		// the files.
 		p.Pkg = types.Unsafe
 		return nil
 	}

-	files, err := p.parseFiles()
+	files, err := p.parseFiles(includeTests)
 	if err != nil {
 		return err
 	}
@@ -323,11 +361,11 @@ func (p *Package) Parse() error {
 // Idempotent.
 func (p *Package) Check() error {
 	if p.Pkg != nil {
-		return nil // already typechecked
+		return nil
 	}

 	var typeErrors []error
-	checker := p.program.typeChecker // make a copy, because it will be modified
+	checker := p.TypeChecker
 	checker.Error = func(err error) {
 		typeErrors = append(typeErrors, err)
 	}
@@ -335,7 +373,7 @@ func (p *Package) Check() error {
 	// Do typechecking of the package.
 	checker.Importer = p

-	typesPkg, err := checker.Check(p.ImportPath, p.program.fset, p.Files, &p.info)
+	typesPkg, err := checker.Check(p.ImportPath, p.fset, p.Files, &p.Info)
 	if err != nil {
 		if err, ok := err.(Errors); ok {
 			return err
@@ -347,47 +385,52 @@ func (p *Package) Check() error {
 }

 // parseFiles parses the loaded list of files and returns this list.
-func (p *Package) parseFiles() ([]*ast.File, error) {
+func (p *Package) parseFiles(includeTests bool) ([]*ast.File, error) {
+	// TODO: do this concurrently.
 	var files []*ast.File
 	var fileErrs []error

-	// Parse all files (incuding CgoFiles).
-	parseFile := func(file string) {
-		if !filepath.IsAbs(file) {
-			file = filepath.Join(p.Dir, file)
-		}
-		f, err := p.program.parseFile(file, parser.ParseComments)
+	var gofiles []string
+	if includeTests {
+		gofiles = make([]string, 0, len(p.GoFiles)+len(p.TestGoFiles))
+		gofiles = append(gofiles, p.GoFiles...)
+		gofiles = append(gofiles, p.TestGoFiles...)
+	} else {
+		gofiles = p.GoFiles
+	}
+
+	for _, file := range gofiles {
+		f, err := p.parseFile(filepath.Join(p.Package.Dir, file), parser.ParseComments)
 		if err != nil {
 			fileErrs = append(fileErrs, err)
-			return
+			continue
+		}
+		if err != nil {
+			fileErrs = append(fileErrs, err)
+			continue
 		}
 		files = append(files, f)
 	}
-	for _, file := range p.GoFiles {
-		parseFile(file)
-	}
 	for _, file := range p.CgoFiles {
-		parseFile(file)
-	}
-
-	// Do CGo processing.
-	if len(p.CgoFiles) != 0 {
-		var cflags []string
-		cflags = append(cflags, p.program.config.CFlags()...)
-		cflags = append(cflags, "-I"+p.Dir)
-		if p.program.clangHeaders != "" {
-			cflags = append(cflags, "-Xclang", "-internal-isystem", "-Xclang", p.program.clangHeaders)
+		path := filepath.Join(p.Package.Dir, file)
+		f, err := p.parseFile(path, parser.ParseComments)
+		if err != nil {
+			fileErrs = append(fileErrs, err)
+			continue
 		}
-		generated, ldflags, errs := cgo.Process(files, p.program.workingDir, p.program.fset, cflags)
+		files = append(files, f)
+	}
+	if len(p.CgoFiles) != 0 {
+		cflags := append(p.CFlags, "-I"+p.Package.Dir)
+		if p.ClangHeaders != "" {
+			cflags = append(cflags, "-Xclang", "-internal-isystem", "-Xclang", p.ClangHeaders)
+		}
+		generated, errs := cgo.Process(files, p.Program.Dir, p.fset, cflags)
 		if errs != nil {
 			fileErrs = append(fileErrs, errs...)
 		}
 		files = append(files, generated)
-		p.program.LDFlags = append(p.program.LDFlags, ldflags...)
 	}
-
-	// Only return an error after CGo processing, so that errors in parsing and
-	// CGo can be reported together.
 	if len(fileErrs) != 0 {
 		return nil, Errors{p, fileErrs}
 	}
@@ -401,9 +444,59 @@ func (p *Package) Import(to string) (*types.Package, error) {
 	if to == "unsafe" {
 		return types.Unsafe, nil
 	}
-	if imported, ok := p.program.Packages[to]; ok {
-		return imported.Pkg, nil
+	if _, ok := p.Imports[to]; ok {
+		return p.Imports[to].Pkg, nil
 	} else {
 		return nil, errors.New("package not imported: " + to)
 	}
 }
+
+// importRecursively calls Program.Import() on all imported packages, and calls
+// importRecursively() on the imported packages as well.
+//
+// Idempotent.
+func (p *Package) importRecursively(includeTests bool) error {
+	p.Importing = true
+
+	imports := p.Package.Imports
+	if includeTests {
+		imports = append(imports, p.Package.TestImports...)
+	}
+
+	for _, to := range imports {
+		if to == "C" {
+			// Do CGo processing in a later stage.
+			continue
+		}
+		if _, ok := p.Imports[to]; ok {
+			continue
+		}
+		// Find error location.
+		var pos token.Position
+		if len(p.Package.ImportPos[to]) > 0 {
+			pos = p.Package.ImportPos[to][0]
+		} else {
+			pos = token.Position{Filename: p.Package.ImportPath}
+		}
+		importedPkg, err := p.Program.Import(to, p.Package.Dir, pos)
+		if err != nil {
+			if err, ok := err.(*ImportCycleError); ok {
+				err.Packages = append([]string{p.ImportPath}, err.Packages...)
+			}
+			return err
+		}
+		if importedPkg.Importing {
+			return &ImportCycleError{[]string{p.ImportPath, importedPkg.ImportPath}, p.ImportPos[to]}
+		}
+		err = importedPkg.importRecursively(false)
+		if err != nil {
+			if err, ok := err.(*ImportCycleError); ok {
+				err.Packages = append([]string{p.ImportPath}, err.Packages...)
+			}
+			return err
+		}
+		p.Imports[to] = importedPkg
+	}
+	p.Importing = false
+	return nil
+}
@@ -10,8 +10,8 @@ import (
 func (p *Program) LoadSSA() *ssa.Program {
 	prog := ssa.NewProgram(p.fset, ssa.SanityCheckFunctions|ssa.BareInits|ssa.GlobalDebug)

-	for _, pkg := range p.sorted {
-		prog.CreatePackage(pkg.Pkg, pkg.Files, &pkg.info, true)
+	for _, pkg := range p.Sorted() {
+		prog.CreatePackage(pkg.Pkg, pkg.Files, &pkg.Info, true)
 	}

 	return prog
@@ -8,7 +8,6 @@ import (
 	"go/scanner"
 	"go/types"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"os/signal"
@@ -29,12 +28,6 @@ import (
 	"go.bug.st/serial"
 )

-var (
-	// This variable is set at build time using -ldflags parameters.
-	// See: https://stackoverflow.com/a/11355611
-	gitSha1 string
-)
-
 // commandError is an error type to wrap os/exec.Command errors. This provides
 // some more information regarding what went wrong while running a command.
 type commandError struct {
@@ -65,28 +58,33 @@ func moveFile(src, dst string) error {
 	return os.Remove(src)
 }

-// copyFile copies the given file from src to dst. It can copy over
-// a possibly already existing file at the destination.
+// copyFile copies the given file from src to dst. It copies first to a .tmp
+// file which is then moved over a possibly already existing file at the
+// destination.
 func copyFile(src, dst string) error {
-	source, err := os.Open(src)
+	inf, err := os.Open(src)
 	if err != nil {
 		return err
 	}
-	defer source.Close()
-
-	st, err := source.Stat()
+	defer inf.Close()
+	outpath := dst + ".tmp"
+	outf, err := os.Create(outpath)
 	if err != nil {
 		return err
 	}

-	destination, err := os.OpenFile(dst, os.O_RDWR|os.O_CREATE|os.O_TRUNC, st.Mode())
+	_, err = io.Copy(outf, inf)
+	if err != nil {
+		os.Remove(outpath)
+		return err
+	}
+
+	err = outf.Close()
 	if err != nil {
 		return err
 	}
-	defer destination.Close()

-	_, err = io.Copy(destination, source)
-	return err
+	return os.Rename(dst+".tmp", dst)
 }

 // Build compiles and links the given package and writes it to outpath.
@@ -96,10 +94,10 @@ func Build(pkgName, outpath string, options *compileopts.Options) error {
 		return err
 	}

-	return builder.Build(pkgName, outpath, config, func(result builder.BuildResult) error {
-		if err := os.Rename(result.Binary, outpath); err != nil {
+	return builder.Build(pkgName, outpath, config, func(tmppath string) error {
+		if err := os.Rename(tmppath, outpath); err != nil {
 			// Moving failed. Do a file copy.
-			inf, err := os.Open(result.Binary)
+			inf, err := os.Open(tmppath)
 			if err != nil {
 				return err
 			}
@@ -125,71 +123,35 @@ func Build(pkgName, outpath string, options *compileopts.Options) error {
 }

 // Test runs the tests in the given package.
-func Test(pkgName string, options *compileopts.Options, testCompileOnly bool, outpath string) error {
-	options.TestConfig.CompileTestBinary = true
+func Test(pkgName string, options *compileopts.Options) error {
 	config, err := builder.NewConfig(options)
 	if err != nil {
 		return err
 	}

-	return builder.Build(pkgName, outpath, config, func(result builder.BuildResult) error {
-		if testCompileOnly || outpath != "" {
-			// Write test binary to the specified file name.
-			if outpath == "" {
-				// No -o path was given, so create one now.
-				// This matches the behavior of go test.
-				outpath = filepath.Base(result.MainDir) + ".test"
-			}
-			copyFile(result.Binary, outpath)
-		}
-		if testCompileOnly {
-			// Do not run the test.
-			return nil
-		}
-		if len(config.Target.Emulator) == 0 {
-			// Run directly.
-			cmd := exec.Command(result.Binary)
-			cmd.Stdout = os.Stdout
-			cmd.Stderr = os.Stderr
-			cmd.Dir = result.MainDir
-			err := cmd.Run()
-			if err != nil {
-				// Propagate the exit code
-				if err, ok := err.(*exec.ExitError); ok {
-					if status, ok := err.Sys().(syscall.WaitStatus); ok {
-						os.Exit(status.ExitStatus())
-					}
-					os.Exit(1)
+	// Add test build tag. This is incorrect: `go test` only looks at the
+	// _test.go file suffix but does not add the test build tag in the process.
+	// However, it's a simple fix right now.
+	// For details: https://github.com/golang/go/issues/21360
+	config.Target.BuildTags = append(config.Target.BuildTags, "test")
+
+	options.TestConfig.CompileTestBinary = true
+	return builder.Build(pkgName, ".elf", config, func(tmppath string) error {
+		cmd := exec.Command(tmppath)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		err := cmd.Run()
+		if err != nil {
+			// Propagate the exit code
+			if err, ok := err.(*exec.ExitError); ok {
+				if status, ok := err.Sys().(syscall.WaitStatus); ok {
+					os.Exit(status.ExitStatus())
 				}
-				return &commandError{"failed to run compiled binary", result.Binary, err}
-			}
-			return nil
-		} else {
-			// Run in an emulator.
-			args := append(config.Target.Emulator[1:], result.Binary)
-			cmd := exec.Command(config.Target.Emulator[0], args...)
-			buf := &bytes.Buffer{}
-			w := io.MultiWriter(os.Stdout, buf)
-			cmd.Stdout = w
-			cmd.Stderr = os.Stderr
-			err := cmd.Run()
-			if err != nil {
-				if err, ok := err.(*exec.ExitError); !ok || !err.Exited() {
-					// Workaround for QEMU which always exits with an error.
-					return &commandError{"failed to run emulator with", result.Binary, err}
-				}
-			}
-			testOutput := string(buf.Bytes())
-			if testOutput == "PASS\n" || strings.HasSuffix(testOutput, "\nPASS\n") {
-				// Test passed.
-				return nil
-			} else {
-				// Test failed, either by ending with the word "FAIL" or with a
-				// panic of some sort.
 				os.Exit(1)
-				return nil // unreachable
 			}
+			return &commandError{"failed to run compiled binary", tmppath, err}
 		}
+		return nil
 	})
 }

@@ -231,9 +193,9 @@ func Flash(pkgName, port string, options *compileopts.Options) error {
 		return errors.New("unknown flash method: " + flashMethod)
 	}

-	return builder.Build(pkgName, fileExt, config, func(result builder.BuildResult) error {
+	return builder.Build(pkgName, fileExt, config, func(tmppath string) error {
 		// do we need port reset to put MCU into bootloader mode?
-		if config.Target.PortReset == "true" && flashMethod != "openocd" {
+		if config.Target.PortReset == "true" {
 			if port == "" {
 				var err error
 				port, err = getDefaultPort()
@@ -244,7 +206,7 @@ func Flash(pkgName, port string, options *compileopts.Options) error {

 			err := touchSerialPortAt1200bps(port)
 			if err != nil {
-				return &commandError{"failed to reset port", result.Binary, err}
+				return &commandError{"failed to reset port", tmppath, err}
 			}
 			// give the target MCU a chance to restart into bootloader
 			time.Sleep(3 * time.Second)
@@ -256,7 +218,7 @@ func Flash(pkgName, port string, options *compileopts.Options) error {
 			// Create the command.
 			flashCmd := config.Target.FlashCommand
 			fileToken := "{" + fileExt[1:] + "}"
-			flashCmd = strings.Replace(flashCmd, fileToken, result.Binary, -1)
+			flashCmd = strings.Replace(flashCmd, fileToken, tmppath, -1)

 			if port == "" && strings.Contains(flashCmd, "{port}") {
 				var err error
@@ -286,21 +248,21 @@ func Flash(pkgName, port string, options *compileopts.Options) error {
 			cmd.Dir = goenv.Get("TINYGOROOT")
 			err := cmd.Run()
 			if err != nil {
-				return &commandError{"failed to flash", result.Binary, err}
+				return &commandError{"failed to flash", tmppath, err}
 			}
 			return nil
 		case "msd":
 			switch fileExt {
 			case ".uf2":
-				err := flashUF2UsingMSD(config.Target.FlashVolume, result.Binary)
+				err := flashUF2UsingMSD(config.Target.FlashVolume, tmppath)
 				if err != nil {
-					return &commandError{"failed to flash", result.Binary, err}
+					return &commandError{"failed to flash", tmppath, err}
 				}
 				return nil
 			case ".hex":
-				err := flashHexUsingMSD(config.Target.FlashVolume, result.Binary)
+				err := flashHexUsingMSD(config.Target.FlashVolume, tmppath)
 				if err != nil {
-					return &commandError{"failed to flash", result.Binary, err}
+					return &commandError{"failed to flash", tmppath, err}
 				}
 				return nil
 			default:
@@ -311,13 +273,13 @@ func Flash(pkgName, port string, options *compileopts.Options) error {
 			if err != nil {
 				return err
 			}
-			args = append(args, "-c", "program "+filepath.ToSlash(result.Binary)+" reset exit")
+			args = append(args, "-c", "program "+tmppath+" reset exit")
 			cmd := exec.Command("openocd", args...)
 			cmd.Stdout = os.Stdout
 			cmd.Stderr = os.Stderr
 			err = cmd.Run()
 			if err != nil {
-				return &commandError{"failed to flash", result.Binary, err}
+				return &commandError{"failed to flash", tmppath, err}
 			}
 			return nil
 		default:
@@ -342,7 +304,7 @@ func FlashGDB(pkgName string, ocdOutput bool, options *compileopts.Options) erro
 		return errors.New("gdb not configured in the target specification")
 	}

-	return builder.Build(pkgName, "", config, func(result builder.BuildResult) error {
+	return builder.Build(pkgName, "", config, func(tmppath string) error {
 		// Find a good way to run GDB.
 		gdbInterface, openocdInterface := config.Programmer()
 		switch gdbInterface {
@@ -351,17 +313,13 @@ func FlashGDB(pkgName string, ocdOutput bool, options *compileopts.Options) erro
 				// Assume QEMU as an emulator.
 				if config.Target.Emulator[0] == "mgba" {
 					gdbInterface = "mgba"
-				} else if strings.HasPrefix(config.Target.Emulator[0], "qemu-system-") {
-					gdbInterface = "qemu"
 				} else {
-					gdbInterface = "qemu-user"
+					gdbInterface = "qemu"
 				}
 			} else if openocdInterface != "" && config.Target.OpenOCDTarget != "" {
 				gdbInterface = "openocd"
 			} else if config.Target.JLinkDevice != "" {
 				gdbInterface = "jlink"
-			} else {
-				gdbInterface = "native"
 			}
 		}

@@ -409,15 +367,7 @@ func FlashGDB(pkgName string, ocdOutput bool, options *compileopts.Options) erro
 			gdbCommands = append(gdbCommands, "target remote :1234")

 			// Run in an emulator.
-			args := append(config.Target.Emulator[1:], result.Binary, "-s", "-S")
-			daemon = exec.Command(config.Target.Emulator[0], args...)
-			daemon.Stdout = os.Stdout
-			daemon.Stderr = os.Stderr
-		case "qemu-user":
-			gdbCommands = append(gdbCommands, "target remote :1234")
-
-			// Run in an emulator.
-			args := append(config.Target.Emulator[1:], "-g", "1234", result.Binary)
+			args := append(config.Target.Emulator[1:], tmppath, "-s", "-S")
 			daemon = exec.Command(config.Target.Emulator[0], args...)
 			daemon.Stdout = os.Stdout
 			daemon.Stderr = os.Stderr
@@ -425,7 +375,7 @@ func FlashGDB(pkgName string, ocdOutput bool, options *compileopts.Options) erro
 			gdbCommands = append(gdbCommands, "target remote :2345")

 			// Run in an emulator.
-			args := append(config.Target.Emulator[1:], result.Binary, "-g")
+			args := append(config.Target.Emulator[1:], tmppath, "-g")
 			daemon = exec.Command(config.Target.Emulator[0], args...)
 			daemon.Stdout = os.Stdout
 			daemon.Stderr = os.Stderr
@@ -463,7 +413,7 @@ func FlashGDB(pkgName string, ocdOutput bool, options *compileopts.Options) erro
 		// Construct and execute a gdb command.
 		// By default: gdb -ex run <binary>
 		// Exit GDB with Ctrl-D.
-		params := []string{result.Binary}
+		params := []string{tmppath}
 		for _, cmd := range gdbCommands {
 			params = append(params, "-ex", cmd)
 		}
@@ -473,7 +423,7 @@ func FlashGDB(pkgName string, ocdOutput bool, options *compileopts.Options) erro
 		cmd.Stderr = os.Stderr
 		err := cmd.Run()
 		if err != nil {
-			return &commandError{"failed to run gdb with", result.Binary, err}
+			return &commandError{"failed to run gdb with", tmppath, err}
 		}
 		return nil
 	})
@@ -489,10 +439,10 @@ func Run(pkgName string, options *compileopts.Options) error {
 		return err
 	}

-	return builder.Build(pkgName, ".elf", config, func(result builder.BuildResult) error {
+	return builder.Build(pkgName, ".elf", config, func(tmppath string) error {
 		if len(config.Target.Emulator) == 0 {
 			// Run directly.
-			cmd := exec.Command(result.Binary)
+			cmd := exec.Command(tmppath)
 			cmd.Stdout = os.Stdout
 			cmd.Stderr = os.Stderr
 			err := cmd.Run()
@@ -501,12 +451,12 @@ func Run(pkgName string, options *compileopts.Options) error {
 					// Workaround for QEMU which always exits with an error.
 					return nil
 				}
-				return &commandError{"failed to run compiled binary", result.Binary, err}
+				return &commandError{"failed to run compiled binary", tmppath, err}
 			}
 			return nil
 		} else {
 			// Run in an emulator.
-			args := append(config.Target.Emulator[1:], result.Binary)
+			args := append(config.Target.Emulator[1:], tmppath)
 			cmd := exec.Command(config.Target.Emulator[0], args...)
 			cmd.Stdout = os.Stdout
 			cmd.Stderr = os.Stderr
@@ -516,7 +466,7 @@ func Run(pkgName string, options *compileopts.Options) error {
 					// Workaround for QEMU which always exits with an error.
 					return nil
 				}
-				return &commandError{"failed to run emulator with", result.Binary, err}
+				return &commandError{"failed to run emulator with", tmppath, err}
 			}
 			return nil
 		}
@@ -529,13 +479,6 @@ func touchSerialPortAt1200bps(port string) (err error) {
 		// Open port
 		p, e := serial.Open(port, &serial.Mode{BaudRate: 1200})
 		if e != nil {
-			if runtime.GOOS == `windows` {
-				se, ok := e.(*serial.PortError)
-				if ok && se.Code() == serial.InvalidSerialPort {
-					// InvalidSerialPort error occurs when transitioning to boot
-					return nil
-				}
-			}
 			time.Sleep(1 * time.Second)
 			err = e
 			continue
@@ -548,8 +491,6 @@ func touchSerialPortAt1200bps(port string) (err error) {
 	return fmt.Errorf("opening port: %s", err)
 }

-const maxMSDRetries = 10
-
 func flashUF2UsingMSD(volume, tmppath string) error {
 	// find standard UF2 info path
 	var infoPath string
@@ -566,12 +507,15 @@ func flashUF2UsingMSD(volume, tmppath string) error {
 		infoPath = path + "/INFO_UF2.TXT"
 	}

-	d, err := locateDevice(volume, infoPath)
+	d, err := filepath.Glob(infoPath)
 	if err != nil {
 		return err
 	}
+	if d == nil {
+		return errors.New("unable to locate UF2 device: " + volume)
+	}

-	return moveFile(tmppath, filepath.Dir(d)+"/flash.uf2")
+	return moveFile(tmppath, filepath.Dir(d[0])+"/flash.uf2")
 }

 func flashHexUsingMSD(volume, tmppath string) error {
@@ -590,31 +534,15 @@ func flashHexUsingMSD(volume, tmppath string) error {
 		destPath = path + "/"
 	}

-	d, err := locateDevice(volume, destPath)
+	d, err := filepath.Glob(destPath)
 	if err != nil {
 		return err
 	}
-
-	return moveFile(tmppath, d+"/flash.hex")
-}
-
-func locateDevice(volume, path string) (string, error) {
-	var d []string
-	var err error
-	for i := 0; i < maxMSDRetries; i++ {
-		d, err = filepath.Glob(path)
-		if err != nil {
-			return "", err
-		}
-		if d != nil {
-			break
-		}
-		time.Sleep(500 * time.Millisecond)
-	}
 	if d == nil {
-		return "", errors.New("unable to locate device: " + volume)
+		return errors.New("unable to locate device: " + volume)
 	}
-	return d[0], nil
+
+	return moveFile(tmppath, d[0]+"/flash.hex")
 }

 func windowsFindUSBDrive(volume string) (string, error) {
@@ -675,18 +603,29 @@ func getDefaultPort() (port string, err error) {
 	case "freebsd":
 		portPath = "/dev/cuaU*"
 	case "windows":
-		ports, err := serial.GetPortsList()
+		cmd := exec.Command("wmic",
+			"PATH", "Win32_SerialPort", "WHERE", "Caption LIKE 'USB Serial%'", "GET", "DeviceID")
+
+		var out bytes.Buffer
+		cmd.Stdout = &out
+		err := cmd.Run()
 		if err != nil {
 			return "", err
 		}

-		if len(ports) == 0 {
+		if out.String() == "No Instance(s) Available." {
 			return "", errors.New("no serial ports available")
-		} else if len(ports) > 1 {
-			return "", errors.New("multiple serial ports available - use -port flag")
 		}

-		return ports[0], nil
+		for _, line := range strings.Split(out.String(), "\n") {
+			words := strings.Fields(line)
+			if len(words) == 1 {
+				if strings.Contains(words[0], "COM") {
+					return words[0], nil
+				}
+			}
+		}
+		return "", errors.New("unable to locate a serial port")
 	default:
 		return "", errors.New("unable to search for a default USB device to be flashed on this OS")
 	}
@@ -704,7 +643,7 @@ func getDefaultPort() (port string, err error) {

 func usage() {
 	fmt.Fprintln(os.Stderr, "TinyGo is a Go compiler for small places.")
-	fmt.Fprintln(os.Stderr, "version:", goenv.Version)
+	fmt.Fprintln(os.Stderr, "version:", version)
 	fmt.Fprintf(os.Stderr, "usage: %s command [-printir] [-target=<target>] -o <output> <input>\n", os.Args[0])
 	fmt.Fprintln(os.Stderr, "\ncommands:")
 	fmt.Fprintln(os.Stderr, "  build: compile packages and dependencies")
@@ -713,27 +652,12 @@ func usage() {
 	fmt.Fprintln(os.Stderr, "  flash: compile and flash to the device")
 	fmt.Fprintln(os.Stderr, "  gdb:   run/flash and immediately enter GDB")
 	fmt.Fprintln(os.Stderr, "  env:   list environment variables used during build")
-	fmt.Fprintln(os.Stderr, "  list:  run go list using the TinyGo root")
 	fmt.Fprintln(os.Stderr, "  clean: empty cache directory ("+goenv.Get("GOCACHE")+")")
 	fmt.Fprintln(os.Stderr, "  help:  print this help text")
 	fmt.Fprintln(os.Stderr, "\nflags:")
 	flag.PrintDefaults()
 }

-// try to make the path relative to the current working directory. If any error
-// occurs, this error is ignored and the absolute path is returned instead.
-func tryToMakePathRelative(dir string) string {
-	wd, err := os.Getwd()
-	if err != nil {
-		return dir
-	}
-	relpath, err := filepath.Rel(wd, dir)
-	if err != nil {
-		return dir
-	}
-	return relpath
-}
-
 // printCompilerError prints compiler errors using the provided logger function
 // (similar to fmt.Println).
 //
@@ -741,24 +665,8 @@ func tryToMakePathRelative(dir string) string {
 // to limitations in the LLVM bindings.
 func printCompilerError(logln func(...interface{}), err error) {
 	switch err := err.(type) {
-	case types.Error:
-		printCompilerError(logln, scanner.Error{
-			Pos: err.Fset.Position(err.Pos),
-			Msg: err.Msg,
-		})
-	case scanner.Error:
-		if !strings.HasPrefix(err.Pos.Filename, filepath.Join(goenv.Get("GOROOT"), "src")) && !strings.HasPrefix(err.Pos.Filename, filepath.Join(goenv.Get("TINYGOROOT"), "src")) {
-			// This file is not from the standard library (either the GOROOT or
-			// the TINYGOROOT). Make the path relative, for easier reading.
-			// Ignore any errors in the process (falling back to the absolute
-			// path).
-			err.Pos.Filename = tryToMakePathRelative(err.Pos.Filename)
-		}
+	case types.Error, scanner.Error:
 		logln(err)
-	case scanner.ErrorList:
-		for _, scannerErr := range err {
-			printCompilerError(logln, *scannerErr)
-		}
 	case *interp.Error:
 		logln("#", err.ImportPath)
 		logln(err.Error())
@@ -777,17 +685,11 @@ func printCompilerError(logln func(...interface{}), err error) {
 	case loader.Errors:
 		logln("#", err.Pkg.ImportPath)
 		for _, err := range err.Errs {
-			printCompilerError(logln, err)
-		}
-	case loader.Error:
-		logln(err.Err.Error())
-		logln("package", err.ImportStack[0])
-		for _, pkgPath := range err.ImportStack[1:] {
-			logln("\timports", pkgPath)
+			logln(err)
 		}
 	case *builder.MultiError:
 		for _, err := range err.Errs {
-			printCompilerError(logln, err)
+			logln(err)
 		}
 	default:
 		logln("error:", err)
@@ -804,46 +706,32 @@ func handleCompilerError(err error) {
 }

 func main() {
-	if len(os.Args) < 2 {
-		fmt.Fprintln(os.Stderr, "No command-line arguments supplied.")
-		usage()
-		os.Exit(1)
-	}
-	command := os.Args[1]
-
+	outpath := flag.String("o", "", "output filename")
 	opt := flag.String("opt", "z", "optimization level: 0, 1, 2, s, z")
 	gc := flag.String("gc", "", "garbage collector to use (none, leaking, extalloc, conservative)")
 	panicStrategy := flag.String("panic", "print", "panic strategy (print, trap)")
-	scheduler := flag.String("scheduler", "", "which scheduler to use (none, coroutines, tasks)")
+	scheduler := flag.String("scheduler", "", "which scheduler to use (coroutines, tasks)")
 	printIR := flag.Bool("printir", false, "print LLVM IR")
 	dumpSSA := flag.Bool("dumpssa", false, "dump internal Go SSA")
 	verifyIR := flag.Bool("verifyir", false, "run extra verification steps on LLVM IR")
 	tags := flag.String("tags", "", "a space-separated list of extra build tags")
 	target := flag.String("target", "", "LLVM target | .json file with TargetSpec")
 	printSize := flag.String("size", "", "print sizes (none, short, full)")
-	printStacks := flag.Bool("print-stacks", false, "print stack sizes of goroutines")
 	nodebug := flag.Bool("no-debug", false, "disable DWARF debug symbol generation")
 	ocdOutput := flag.Bool("ocd-output", false, "print OCD daemon output during debug")
 	port := flag.String("port", "", "flash port")
 	programmer := flag.String("programmer", "", "which hardware programmer to use")
 	cFlags := flag.String("cflags", "", "additional cflags for compiler")
 	ldFlags := flag.String("ldflags", "", "additional ldflags for linker")
-	wasmAbi := flag.String("wasm-abi", "", "WebAssembly ABI conventions: js (no i64 params) or generic")
+	wasmAbi := flag.String("wasm-abi", "js", "WebAssembly ABI conventions: js (no i64 params) or generic")
 	heapSize := flag.String("heap-size", "1M", "default heap size in bytes (only supported by WebAssembly)")

-	var flagJSON, flagDeps *bool
-	if command == "help" || command == "list" {
-		flagJSON = flag.Bool("json", false, "print data in JSON format")
-		flagDeps = flag.Bool("deps", false, "")
-	}
-	var outpath string
-	if command == "help" || command == "build" || command == "build-library" || command == "test" {
-		flag.StringVar(&outpath, "o", "", "output filename")
-	}
-	var testCompileOnlyFlag *bool
-	if command == "help" || command == "test" {
-		testCompileOnlyFlag = flag.Bool("c", false, "compile the test binary but do not run it")
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "No command-line arguments supplied.")
+		usage()
+		os.Exit(1)
 	}
+	command := os.Args[1]

 	// Early command processing, before commands are interpreted by the Go flag
 	// library.
@@ -869,7 +757,6 @@ func main() {
 		VerifyIR:      *verifyIR,
 		Debug:         !*nodebug,
 		PrintSizes:    *printSize,
-		PrintStacks:   *printStacks,
 		Tags:          *tags,
 		WasmAbi:       *wasmAbi,
 		Programmer:    *programmer,
@@ -883,6 +770,12 @@ func main() {
 		options.LDFlags = strings.Split(*ldFlags, " ")
 	}

+	if *panicStrategy != "print" && *panicStrategy != "trap" {
+		fmt.Fprintln(os.Stderr, "Panic strategy must be either print or trap.")
+		usage()
+		os.Exit(1)
+	}
+
 	var err error
 	if options.HeapSize, err = parseSize(*heapSize); err != nil {
 		fmt.Fprintln(os.Stderr, "Could not read heap size:", *heapSize)
@@ -892,37 +785,29 @@ func main() {

 	os.Setenv("CC", "clang -target="+*target)

-	err = options.Verify()
-	if err != nil {
-		fmt.Fprintln(os.Stderr, err.Error())
-		usage()
-		os.Exit(1)
-	}
-
 	switch command {
 	case "build":
-		if outpath == "" {
+		if *outpath == "" {
 			fmt.Fprintln(os.Stderr, "No output filename supplied (-o).")
 			usage()
 			os.Exit(1)
 		}
 		pkgName := "."
 		if flag.NArg() == 1 {
-			pkgName = filepath.ToSlash(flag.Arg(0))
+			pkgName = flag.Arg(0)
 		} else if flag.NArg() > 1 {
 			fmt.Fprintln(os.Stderr, "build only accepts a single positional argument: package name, but multiple were specified")
 			usage()
 			os.Exit(1)
 		}
-		if options.Target == "" && filepath.Ext(outpath) == ".wasm" {
+		if options.Target == "" && filepath.Ext(*outpath) == ".wasm" {
 			options.Target = "wasm"
 		}
-
-		err := Build(pkgName, outpath, options)
+		err := Build(pkgName, *outpath, options)
 		handleCompilerError(err)
 	case "build-library":
 		// Note: this command is only meant to be used while making a release!
-		if outpath == "" {
+		if *outpath == "" {
 			fmt.Fprintln(os.Stderr, "No output filename supplied (-o).")
 			usage()
 			os.Exit(1)
@@ -947,11 +832,15 @@ func main() {
 		}
 		path, err := lib.Load(*target)
 		handleCompilerError(err)
-		copyFile(path, outpath)
+		copyFile(path, *outpath)
 	case "flash", "gdb":
-		pkgName := filepath.ToSlash(flag.Arg(0))
+		if *outpath != "" {
+			fmt.Fprintln(os.Stderr, "Output cannot be specified with the flash command.")
+			usage()
+			os.Exit(1)
+		}
 		if command == "flash" {
-			err := Flash(pkgName, *port, options)
+			err := Flash(flag.Arg(0), *port, options)
 			handleCompilerError(err)
 		} else {
 			if !options.Debug {
@@ -959,7 +848,7 @@ func main() {
 				usage()
 				os.Exit(1)
 			}
-			err := FlashGDB(pkgName, *ocdOutput, options)
+			err := FlashGDB(flag.Arg(0), *ocdOutput, options)
 			handleCompilerError(err)
 		}
 	case "run":
@@ -968,49 +857,19 @@ func main() {
 			usage()
 			os.Exit(1)
 		}
-		pkgName := filepath.ToSlash(flag.Arg(0))
-		err := Run(pkgName, options)
+		err := Run(flag.Arg(0), options)
 		handleCompilerError(err)
 	case "test":
 		pkgName := "."
 		if flag.NArg() == 1 {
-			pkgName = filepath.ToSlash(flag.Arg(0))
+			pkgName = flag.Arg(0)
 		} else if flag.NArg() > 1 {
 			fmt.Fprintln(os.Stderr, "test only accepts a single positional argument: package name, but multiple were specified")
 			usage()
 			os.Exit(1)
 		}
-		err := Test(pkgName, options, *testCompileOnlyFlag, outpath)
+		err := Test(pkgName, options)
 		handleCompilerError(err)
-	case "targets":
-		dir := filepath.Join(goenv.Get("TINYGOROOT"), "targets")
-		entries, err := ioutil.ReadDir(dir)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "could not list targets:", err)
-			os.Exit(1)
-			return
-		}
-		for _, entry := range entries {
-			if !entry.Mode().IsRegular() || !strings.HasSuffix(entry.Name(), ".json") {
-				// Only inspect JSON files.
-				continue
-			}
-			path := filepath.Join(dir, entry.Name())
-			spec, err := compileopts.LoadTarget(path)
-			if err != nil {
-				fmt.Fprintln(os.Stderr, "could not list target:", err)
-				os.Exit(1)
-				return
-			}
-			if spec.FlashMethod == "" && spec.FlashCommand == "" && spec.Emulator == nil {
-				// 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]
-			fmt.Println(name)
-		}
 	case "info":
 		if flag.NArg() == 1 {
 			options.Target = flag.Arg(0)
@@ -1030,50 +889,12 @@ func main() {
 			fmt.Fprintln(os.Stderr, err)
 			os.Exit(1)
 		}
-		cachedGOROOT, err := loader.GetCachedGoroot(config)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, err)
-			os.Exit(1)
-		}
 		fmt.Printf("LLVM triple:       %s\n", config.Triple())
 		fmt.Printf("GOOS:              %s\n", config.GOOS())
 		fmt.Printf("GOARCH:            %s\n", config.GOARCH())
 		fmt.Printf("build tags:        %s\n", strings.Join(config.BuildTags(), " "))
 		fmt.Printf("garbage collector: %s\n", config.GC())
 		fmt.Printf("scheduler:         %s\n", config.Scheduler())
-		fmt.Printf("cached GOROOT:     %s\n", cachedGOROOT)
-	case "list":
-		config, err := builder.NewConfig(options)
-		if err != nil {
-			fmt.Fprintln(os.Stderr, err)
-			usage()
-			os.Exit(1)
-		}
-		var extraArgs []string
-		if *flagJSON {
-			extraArgs = append(extraArgs, "-json")
-		}
-		if *flagDeps {
-			extraArgs = append(extraArgs, "-deps")
-		}
-		cmd, err := loader.List(config, extraArgs, flag.Args())
-		if err != nil {
-			fmt.Fprintln(os.Stderr, "failed to run `go list`:", err)
-			os.Exit(1)
-		}
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		err = cmd.Run()
-		if err != nil {
-			if exitErr, ok := err.(*exec.ExitError); ok {
-				if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
-					os.Exit(status.ExitStatus())
-				}
-				os.Exit(1)
-			}
-			fmt.Fprintln(os.Stderr, "failed to run `go list`:", err)
-			os.Exit(1)
-		}
 	case "clean":
 		// remove cache directory
 		err := os.RemoveAll(goenv.Get("GOCACHE"))
@@ -1085,13 +906,9 @@ func main() {
 		usage()
 	case "version":
 		goversion := "<unknown>"
-		if s, err := goenv.GorootVersionString(goenv.Get("GOROOT")); err == nil {
+		if s, err := builder.GorootVersionString(goenv.Get("GOROOT")); err == nil {
 			goversion = s
 		}
-		version := goenv.Version
-		if strings.HasSuffix(goenv.Version, "-dev") && gitSha1 != "" {
-			version += "-" + gitSha1
-		}
 		fmt.Printf("tinygo version %s %s/%s (using go version %s and LLVM version %s)\n", version, runtime.GOOS, runtime.GOARCH, goversion, llvm.Version)
 	case "env":
 		if flag.NArg() == 0 {
@@ -6,7 +6,6 @@ package main
 import (
 	"bufio"
 	"bytes"
-	"flag"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -26,8 +25,6 @@ import (

 const TESTDATA = "testdata"

-var testTarget = flag.String("target", "", "override test target")
-
 func TestCompiler(t *testing.T) {
 	matches, err := filepath.Glob(filepath.Join(TESTDATA, "*.go"))
 	if err != nil {
@@ -47,14 +44,6 @@ func TestCompiler(t *testing.T) {

 	sort.Strings(matches)

-	if *testTarget != "" {
-		// This makes it possible to run one specific test (instead of all),
-		// which is especially useful to quickly check whether some changes
-		// affect a particular target architecture.
-		runPlatTests(*testTarget, matches, t)
-		return
-	}
-
 	if runtime.GOOS != "windows" {
 		t.Run("Host", func(t *testing.T) {
 			runPlatTests("", matches, t)
@@ -78,16 +67,13 @@ func TestCompiler(t *testing.T) {
 	}

 	if runtime.GOOS == "linux" {
-		t.Run("X86Linux", func(t *testing.T) {
-			runPlatTests("i386--linux-gnu", matches, t)
-		})
 		t.Run("ARMLinux", func(t *testing.T) {
 			runPlatTests("arm--linux-gnueabihf", matches, t)
 		})
 		t.Run("ARM64Linux", func(t *testing.T) {
 			runPlatTests("aarch64--linux-gnu", matches, t)
 		})
-		goVersion, err := goenv.GorootVersionString(goenv.Get("GOROOT"))
+		goVersion, err := builder.GorootVersionString(goenv.Get("GOROOT"))
 		if err != nil {
 			t.Error("could not get Go version:", err)
 			return
@@ -101,10 +87,6 @@ func TestCompiler(t *testing.T) {
 				runPlatTests("wasm", matches, t)
 			})
 		}
-
-		t.Run("WASI", func(t *testing.T) {
-			runPlatTests("wasi", matches, t)
-		})
 	}
 }

@@ -116,6 +98,7 @@ func runPlatTests(target string, matches []string, t *testing.T) {

 		t.Run(filepath.Base(path), func(t *testing.T) {
 			t.Parallel()
+
 			runTest(path, target, t)
 		})
 	}
@@ -163,11 +146,10 @@ func runTest(path, target string, t *testing.T) {
 		PrintIR:    false,
 		DumpSSA:    false,
 		VerifyIR:   true,
-		Debug:      true,
+		Debug:      false,
 		PrintSizes: "",
-		WasmAbi:    "",
+		WasmAbi:    "js",
 	}
-
 	binary := filepath.Join(tmpdir, "test")
 	err = runBuild("./"+path, binary, config)
 	if err != nil {
@@ -188,11 +170,10 @@ func runTest(path, target string, t *testing.T) {
 			t.Fatal("failed to load target spec:", err)
 		}
 		if len(spec.Emulator) == 0 {
-			cmd = exec.Command(binary)
-		} else {
-			args := append(spec.Emulator[1:], binary)
-			cmd = exec.Command(spec.Emulator[0], args...)
+			t.Fatal("no emulator available for target:", target)
 		}
+		args := append(spec.Emulator[1:], binary)
+		cmd = exec.Command(spec.Emulator[0], args...)
 	}
 	stdout := &bytes.Buffer{}
 	cmd.Stdout = stdout
@@ -76,8 +76,32 @@ const (
 	SCS_BASE  = 0xE000E000
 	SYST_BASE = SCS_BASE + 0x0010
 	NVIC_BASE = SCS_BASE + 0x0100
+	SCB_BASE  = SCS_BASE + 0x0D00
 )

+const (
+	SCB_AIRCR_VECTKEY_Pos     = 16
+	SCB_AIRCR_SYSRESETREQ_Pos = 2
+	SCB_AIRCR_SYSRESETREQ_Msk = 1 << SCB_AIRCR_SYSRESETREQ_Pos
+)
+
+// System Control Block (SCB)
+//
+// SCB_Type provides the definitions for the System Control Block Registers.
+type SCB_Type struct {
+	CPUID volatile.Register32    // CPUID Base Register
+	ICSR  volatile.Register32    // Interrupt Control and State Register
+	VTOR  volatile.Register32    // Vector Table Offset Register
+	AIRCR volatile.Register32    // Application Interrupt and Reset Control Register
+	SCR   volatile.Register32    // System Control Register
+	CCR   volatile.Register32    // Configuration Control Register
+	_     volatile.Register32    // RESERVED1;
+	SHP   [2]volatile.Register32 // System Handlers Priority Registers. [0] is RESERVED
+	SHCSR volatile.Register32    // System Handler Control and State Register
+}
+
+var SCB = (*SCB_Type)(unsafe.Pointer(uintptr(SCB_BASE)))
+
 // Nested Vectored Interrupt Controller (NVIC).
 //
 // Source:
@@ -150,11 +174,6 @@ func EnableIRQ(irq uint32) {
 	NVIC.ISER[irq>>5].Set(1 << (irq & 0x1F))
 }

-// Disable the given interrupt number.
-func DisableIRQ(irq uint32) {
-	NVIC.ICER[irq>>5].Set(1 << (irq & 0x1F))
-}
-
 // Set the priority of the given interrupt number.
 // Note that the priority is given as a 0-255 number, where some of the lower
 // bits are not implemented by the hardware. For example, to set a low interrupt
@@ -177,7 +196,7 @@ func SetPriority(irq uint32, priority uint32) {
 func DisableInterrupts() uintptr {
 	return AsmFull(`
 		mrs {}, PRIMASK
-		cpsid i
+		cpsid if
 	`, nil)
 }

@@ -189,6 +208,17 @@ func EnableInterrupts(mask uintptr) {
 	})
 }

+// SystemReset performs a hard system reset.
+func SystemReset() {
+	// SCB->AIRCR  = ((0x5FA << SCB_AIRCR_VECTKEY_Pos)      |
+	//              SCB_AIRCR_SYSRESETREQ_Msk);
+	SCB.AIRCR.Set((0x5FA << SCB_AIRCR_VECTKEY_Pos) | SCB_AIRCR_SYSRESETREQ_Msk)
+
+	for {
+		Asm("wfi")
+	}
+}
+
 // Set up the system timer to generate periodic tick events.
 // This will cause SysTick_Handler to fire once per tick.
 // The cyclecount parameter is a counter value which can range from 0 to
@@ -1,11 +1,9 @@
 .syntax unified
-.cfi_sections .debug_frame

 .section .text.HardFault_Handler
 .global  HardFault_Handler
 .type    HardFault_Handler, %function
 HardFault_Handler:
-    .cfi_startproc
    // Put the old stack pointer in the first argument, for easy debugging. This
    // is especially useful on Cortex-M0, which supports far fewer debug
    // facilities.
@@ -21,8 +19,6 @@ HardFault_Handler:

    // Continue handling this error in Go.
    bl handleHardFault
-    .cfi_endproc
-.size HardFault_Handler, .-HardFault_Handler

 // This is a convenience function for semihosting support.
 // At some point, this should be replaced by inline assembly.
@@ -30,8 +26,5 @@ HardFault_Handler:
 .global  SemihostingCall
 .type    SemihostingCall, %function
 SemihostingCall:
-    .cfi_startproc
    bkpt 0xab
    bx   lr
-    .cfi_endproc
-.size SemihostingCall, .-SemihostingCall
@@ -1,431 +0,0 @@
-// Hand created file. DO NOT DELETE.
-// Cortex-M System Control Block-related definitions.
-
-// +build cortexm
-
-package arm
-
-import (
-	"runtime/volatile"
-	"unsafe"
-)
-
-const SCB_BASE = SCS_BASE + 0x0D00
-
-// System Control Block (SCB)
-//
-// SCB_Type provides the definitions for the System Control Block Registers.
-type SCB_Type struct {
-	CPUID volatile.Register32 // 0xD00: CPUID Base Register
-	ICSR  volatile.Register32 // 0xD04: Interrupt Control and State Register
-	VTOR  volatile.Register32 // 0xD08: Vector Table Offset Register
-	AIRCR volatile.Register32 // 0xD0C: Application Interrupt and Reset Control Register
-	SCR   volatile.Register32 // 0xD10: System Control Register
-	CCR   volatile.Register32 // 0xD14: Configuration and Control Register
-	SHPR1 volatile.Register32 // 0xD18: System Handler Priority Register 1 (Cortex-M3/M33/M4/M7 only)
-	SHPR2 volatile.Register32 // 0xD1C: System Handler Priority Register 2
-	SHPR3 volatile.Register32 // 0xD20: System Handler Priority Register 3
-	// the following are only applicable for Cortex-M3/M33/M4/M7
-	SHCSR volatile.Register32 // 0xD24: System Handler Control and State Register
-	CFSR  volatile.Register32 // 0xD28: Configurable Fault Status Register
-	HFSR  volatile.Register32 // 0xD2C: HardFault Status Register
-	DFSR  volatile.Register32 // 0xD30: Debug Fault Status Register
-	MMFAR volatile.Register32 // 0xD34: MemManage Fault Address Register
-	BFAR  volatile.Register32 // 0xD38: BusFault Address Register
-}
-
-var SCB = (*SCB_Type)(unsafe.Pointer(uintptr(SCB_BASE)))
-
-// SystemReset performs a hard system reset.
-func SystemReset() {
-	SCB.AIRCR.Set((0x5FA << SCB_AIRCR_VECTKEY_Pos) | SCB_AIRCR_SYSRESETREQ_Msk)
-	for {
-		Asm("wfi")
-	}
-}
-
-const (
-	// CPUID: CPUID Base Register
-	SCB_CPUID_REVISION_Pos     = 0x0        // Position of REVISION field.
-	SCB_CPUID_REVISION_Msk     = 0xf        // Bit mask of REVISION field.
-	SCB_CPUID_PARTNO_Pos       = 0x4        // Position of PARTNO field.
-	SCB_CPUID_PARTNO_Msk       = 0xfff0     // Bit mask of PARTNO field.
-	SCB_CPUID_ARCHITECTURE_Pos = 0x10       // Position of ARCHITECTURE field.
-	SCB_CPUID_ARCHITECTURE_Msk = 0xf0000    // Bit mask of ARCHITECTURE field.
-	SCB_CPUID_VARIANT_Pos      = 0x14       // Position of VARIANT field.
-	SCB_CPUID_VARIANT_Msk      = 0xf00000   // Bit mask of VARIANT field.
-	SCB_CPUID_IMPLEMENTER_Pos  = 0x18       // Position of IMPLEMENTER field.
-	SCB_CPUID_IMPLEMENTER_Msk  = 0xff000000 // Bit mask of IMPLEMENTER field.
-
-	// ICSR: Interrupt Control and State Register
-	SCB_ICSR_VECTACTIVE_Pos          = 0x0        // Position of VECTACTIVE field.
-	SCB_ICSR_VECTACTIVE_Msk          = 0x1ff      // Bit mask of VECTACTIVE field.
-	SCB_ICSR_RETTOBASE_Pos           = 0xb        // Position of RETTOBASE field.
-	SCB_ICSR_RETTOBASE_Msk           = 0x800      // Bit mask of RETTOBASE field.
-	SCB_ICSR_RETTOBASE               = 0x800      // Bit RETTOBASE.
-	SCB_ICSR_RETTOBASE_RETTOBASE_0   = 0x0        // there are preempted active exceptions to execute
-	SCB_ICSR_RETTOBASE_RETTOBASE_1   = 0x1        // there are no active exceptions, or the currently-executing exception is the only active exception
-	SCB_ICSR_VECTPENDING_Pos         = 0xc        // Position of VECTPENDING field.
-	SCB_ICSR_VECTPENDING_Msk         = 0x1ff000   // Bit mask of VECTPENDING field.
-	SCB_ICSR_ISRPENDING_Pos          = 0x16       // Position of ISRPENDING field.
-	SCB_ICSR_ISRPENDING_Msk          = 0x400000   // Bit mask of ISRPENDING field.
-	SCB_ICSR_ISRPENDING              = 0x400000   // Bit ISRPENDING.
-	SCB_ICSR_ISRPENDING_ISRPENDING_0 = 0x0        // No external interrupt pending.
-	SCB_ICSR_ISRPENDING_ISRPENDING_1 = 0x1        // External interrupt pending.
-	SCB_ICSR_PENDSTCLR_Pos           = 0x19       // Position of PENDSTCLR field.
-	SCB_ICSR_PENDSTCLR_Msk           = 0x2000000  // Bit mask of PENDSTCLR field.
-	SCB_ICSR_PENDSTCLR               = 0x2000000  // Bit PENDSTCLR.
-	SCB_ICSR_PENDSTCLR_PENDSTCLR_0   = 0x0        // no effect
-	SCB_ICSR_PENDSTCLR_PENDSTCLR_1   = 0x1        // removes the pending state from the SysTick exception
-	SCB_ICSR_PENDSTSET_Pos           = 0x1a       // Position of PENDSTSET field.
-	SCB_ICSR_PENDSTSET_Msk           = 0x4000000  // Bit mask of PENDSTSET field.
-	SCB_ICSR_PENDSTSET               = 0x4000000  // Bit PENDSTSET.
-	SCB_ICSR_PENDSTSET_PENDSTSET_0   = 0x0        // write: no effect; read: SysTick exception is not pending
-	SCB_ICSR_PENDSTSET_PENDSTSET_1   = 0x1        // write: changes SysTick exception state to pending; read: SysTick exception is pending
-	SCB_ICSR_PENDSVCLR_Pos           = 0x1b       // Position of PENDSVCLR field.
-	SCB_ICSR_PENDSVCLR_Msk           = 0x8000000  // Bit mask of PENDSVCLR field.
-	SCB_ICSR_PENDSVCLR               = 0x8000000  // Bit PENDSVCLR.
-	SCB_ICSR_PENDSVCLR_PENDSVCLR_0   = 0x0        // no effect
-	SCB_ICSR_PENDSVCLR_PENDSVCLR_1   = 0x1        // removes the pending state from the PendSV exception
-	SCB_ICSR_PENDSVSET_Pos           = 0x1c       // Position of PENDSVSET field.
-	SCB_ICSR_PENDSVSET_Msk           = 0x10000000 // Bit mask of PENDSVSET field.
-	SCB_ICSR_PENDSVSET               = 0x10000000 // Bit PENDSVSET.
-	SCB_ICSR_PENDSVSET_PENDSVSET_0   = 0x0        // write: no effect; read: PendSV exception is not pending
-	SCB_ICSR_PENDSVSET_PENDSVSET_1   = 0x1        // write: changes PendSV exception state to pending; read: PendSV exception is pending
-	SCB_ICSR_NMIPENDSET_Pos          = 0x1f       // Position of NMIPENDSET field.
-	SCB_ICSR_NMIPENDSET_Msk          = 0x80000000 // Bit mask of NMIPENDSET field.
-	SCB_ICSR_NMIPENDSET              = 0x80000000 // Bit NMIPENDSET.
-	SCB_ICSR_NMIPENDSET_NMIPENDSET_0 = 0x0        // write: no effect; read: NMI exception is not pending
-	SCB_ICSR_NMIPENDSET_NMIPENDSET_1 = 0x1        // write: changes NMI exception state to pending; read: NMI exception is pending
-
-	// VTOR: Vector Table Offset Register
-	SCB_VTOR_TBLOFF_Pos = 0x7        // Position of TBLOFF field.
-	SCB_VTOR_TBLOFF_Msk = 0xffffff80 // Bit mask of TBLOFF field.
-
-	// AIRCR: Application Interrupt and Reset Control Register
-	SCB_AIRCR_VECTRESET_Pos                 = 0x0        // Position of VECTRESET field.
-	SCB_AIRCR_VECTRESET_Msk                 = 0x1        // Bit mask of VECTRESET field.
-	SCB_AIRCR_VECTRESET                     = 0x1        // Bit VECTRESET.
-	SCB_AIRCR_VECTRESET_VECTRESET_0         = 0x0        // No change
-	SCB_AIRCR_VECTRESET_VECTRESET_1         = 0x1        // Causes a local system reset
-	SCB_AIRCR_VECTCLRACTIVE_Pos             = 0x1        // Position of VECTCLRACTIVE field.
-	SCB_AIRCR_VECTCLRACTIVE_Msk             = 0x2        // Bit mask of VECTCLRACTIVE field.
-	SCB_AIRCR_VECTCLRACTIVE                 = 0x2        // Bit VECTCLRACTIVE.
-	SCB_AIRCR_VECTCLRACTIVE_VECTCLRACTIVE_0 = 0x0        // No change
-	SCB_AIRCR_VECTCLRACTIVE_VECTCLRACTIVE_1 = 0x1        // Clears all active state information for fixed and configurable exceptions
-	SCB_AIRCR_SYSRESETREQ_Pos               = 0x2        // Position of SYSRESETREQ field.
-	SCB_AIRCR_SYSRESETREQ_Msk               = 0x4        // Bit mask of SYSRESETREQ field.
-	SCB_AIRCR_SYSRESETREQ                   = 0x4        // Bit SYSRESETREQ.
-	SCB_AIRCR_SYSRESETREQ_SYSRESETREQ_0     = 0x0        // no system reset request
-	SCB_AIRCR_SYSRESETREQ_SYSRESETREQ_1     = 0x1        // asserts a signal to the outer system that requests a reset
-	SCB_AIRCR_PRIGROUP_Pos                  = 0x8        // Position of PRIGROUP field.
-	SCB_AIRCR_PRIGROUP_Msk                  = 0x700      // Bit mask of PRIGROUP field.
-	SCB_AIRCR_ENDIANNESS_Pos                = 0xf        // Position of ENDIANNESS field.
-	SCB_AIRCR_ENDIANNESS_Msk                = 0x8000     // Bit mask of ENDIANNESS field.
-	SCB_AIRCR_ENDIANNESS                    = 0x8000     // Bit ENDIANNESS.
-	SCB_AIRCR_ENDIANNESS_ENDIANNESS_0       = 0x0        // Little-endian
-	SCB_AIRCR_ENDIANNESS_ENDIANNESS_1       = 0x1        // Big-endian
-	SCB_AIRCR_VECTKEY_Pos                   = 0x10       // Position of VECTKEY field.
-	SCB_AIRCR_VECTKEY_Msk                   = 0xffff0000 // Bit mask of VECTKEY field.
-
-	// SCR: System Control Register
-	SCB_SCR_SLEEPONEXIT_Pos           = 0x1  // Position of SLEEPONEXIT field.
-	SCB_SCR_SLEEPONEXIT_Msk           = 0x2  // Bit mask of SLEEPONEXIT field.
-	SCB_SCR_SLEEPONEXIT               = 0x2  // Bit SLEEPONEXIT.
-	SCB_SCR_SLEEPONEXIT_SLEEPONEXIT_0 = 0x0  // o not sleep when returning to Thread mode
-	SCB_SCR_SLEEPONEXIT_SLEEPONEXIT_1 = 0x1  // enter sleep, or deep sleep, on return from an ISR
-	SCB_SCR_SLEEPDEEP_Pos             = 0x2  // Position of SLEEPDEEP field.
-	SCB_SCR_SLEEPDEEP_Msk             = 0x4  // Bit mask of SLEEPDEEP field.
-	SCB_SCR_SLEEPDEEP                 = 0x4  // Bit SLEEPDEEP.
-	SCB_SCR_SLEEPDEEP_SLEEPDEEP_0     = 0x0  // sleep
-	SCB_SCR_SLEEPDEEP_SLEEPDEEP_1     = 0x1  // deep sleep
-	SCB_SCR_SEVONPEND_Pos             = 0x4  // Position of SEVONPEND field.
-	SCB_SCR_SEVONPEND_Msk             = 0x10 // Bit mask of SEVONPEND field.
-	SCB_SCR_SEVONPEND                 = 0x10 // Bit SEVONPEND.
-	SCB_SCR_SEVONPEND_SEVONPEND_0     = 0x0  // only enabled interrupts or events can wakeup the processor, disabled interrupts are excluded
-	SCB_SCR_SEVONPEND_SEVONPEND_1     = 0x1  // enabled events and all interrupts, including disabled interrupts, can wakeup the processor
-
-	// CCR: Configuration and Control Register
-	SCB_CCR_NONBASETHRDENA_Pos              = 0x0     // Position of NONBASETHRDENA field.
-	SCB_CCR_NONBASETHRDENA_Msk              = 0x1     // Bit mask of NONBASETHRDENA field.
-	SCB_CCR_NONBASETHRDENA                  = 0x1     // Bit NONBASETHRDENA.
-	SCB_CCR_NONBASETHRDENA_NONBASETHRDENA_0 = 0x0     // processor can enter Thread mode only when no exception is active
-	SCB_CCR_NONBASETHRDENA_NONBASETHRDENA_1 = 0x1     // processor can enter Thread mode from any level under the control of an EXC_RETURN value
-	SCB_CCR_USERSETMPEND_Pos                = 0x1     // Position of USERSETMPEND field.
-	SCB_CCR_USERSETMPEND_Msk                = 0x2     // Bit mask of USERSETMPEND field.
-	SCB_CCR_USERSETMPEND                    = 0x2     // Bit USERSETMPEND.
-	SCB_CCR_USERSETMPEND_USERSETMPEND_0     = 0x0     // disable
-	SCB_CCR_USERSETMPEND_USERSETMPEND_1     = 0x1     // enable
-	SCB_CCR_UNALIGN_TRP_Pos                 = 0x3     // Position of UNALIGN_TRP field.
-	SCB_CCR_UNALIGN_TRP_Msk                 = 0x8     // Bit mask of UNALIGN_TRP field.
-	SCB_CCR_UNALIGN_TRP                     = 0x8     // Bit UNALIGN_TRP.
-	SCB_CCR_UNALIGN_TRP_UNALIGN_TRP_0       = 0x0     // do not trap unaligned halfword and word accesses
-	SCB_CCR_UNALIGN_TRP_UNALIGN_TRP_1       = 0x1     // trap unaligned halfword and word accesses
-	SCB_CCR_DIV_0_TRP_Pos                   = 0x4     // Position of DIV_0_TRP field.
-	SCB_CCR_DIV_0_TRP_Msk                   = 0x10    // Bit mask of DIV_0_TRP field.
-	SCB_CCR_DIV_0_TRP                       = 0x10    // Bit DIV_0_TRP.
-	SCB_CCR_DIV_0_TRP_DIV_0_TRP_0           = 0x0     // do not trap divide by 0
-	SCB_CCR_DIV_0_TRP_DIV_0_TRP_1           = 0x1     // trap divide by 0
-	SCB_CCR_BFHFNMIGN_Pos                   = 0x8     // Position of BFHFNMIGN field.
-	SCB_CCR_BFHFNMIGN_Msk                   = 0x100   // Bit mask of BFHFNMIGN field.
-	SCB_CCR_BFHFNMIGN                       = 0x100   // Bit BFHFNMIGN.
-	SCB_CCR_BFHFNMIGN_BFHFNMIGN_0           = 0x0     // data bus faults caused by load and store instructions cause a lock-up
-	SCB_CCR_BFHFNMIGN_BFHFNMIGN_1           = 0x1     // handlers running at priority -1 and -2 ignore data bus faults caused by load and store instructions
-	SCB_CCR_STKALIGN_Pos                    = 0x9     // Position of STKALIGN field.
-	SCB_CCR_STKALIGN_Msk                    = 0x200   // Bit mask of STKALIGN field.
-	SCB_CCR_STKALIGN                        = 0x200   // Bit STKALIGN.
-	SCB_CCR_STKALIGN_STKALIGN_0             = 0x0     // 4-byte aligned
-	SCB_CCR_STKALIGN_STKALIGN_1             = 0x1     // 8-byte aligned
-	SCB_CCR_DC_Pos                          = 0x10    // Position of DC field.
-	SCB_CCR_DC_Msk                          = 0x10000 // Bit mask of DC field.
-	SCB_CCR_DC                              = 0x10000 // Bit DC.
-	SCB_CCR_DC_DC_0                         = 0x0     // L1 data cache disabled
-	SCB_CCR_DC_DC_1                         = 0x1     // L1 data cache enabled
-	SCB_CCR_IC_Pos                          = 0x11    // Position of IC field.
-	SCB_CCR_IC_Msk                          = 0x20000 // Bit mask of IC field.
-	SCB_CCR_IC                              = 0x20000 // Bit IC.
-	SCB_CCR_IC_IC_0                         = 0x0     // L1 instruction cache disabled
-	SCB_CCR_IC_IC_1                         = 0x1     // L1 instruction cache enabled
-	SCB_CCR_BP_Pos                          = 0x12    // Position of BP field.
-	SCB_CCR_BP_Msk                          = 0x40000 // Bit mask of BP field.
-	SCB_CCR_BP                              = 0x40000 // Bit BP.
-
-	// SHPR1: System Handler Priority Register 1
-	SCB_SHPR1_PRI_4_Pos = 0x0      // Position of PRI_4 field.
-	SCB_SHPR1_PRI_4_Msk = 0xff     // Bit mask of PRI_4 field.
-	SCB_SHPR1_PRI_5_Pos = 0x8      // Position of PRI_5 field.
-	SCB_SHPR1_PRI_5_Msk = 0xff00   // Bit mask of PRI_5 field.
-	SCB_SHPR1_PRI_6_Pos = 0x10     // Position of PRI_6 field.
-	SCB_SHPR1_PRI_6_Msk = 0xff0000 // Bit mask of PRI_6 field.
-
-	// SHPR2: System Handler Priority Register 2
-	SCB_SHPR2_PRI_11_Pos = 0x18       // Position of PRI_11 field.
-	SCB_SHPR2_PRI_11_Msk = 0xff000000 // Bit mask of PRI_11 field.
-
-	// SHPR3: System Handler Priority Register 3
-	SCB_SHPR3_PRI_14_Pos = 0x10       // Position of PRI_14 field.
-	SCB_SHPR3_PRI_14_Msk = 0xff0000   // Bit mask of PRI_14 field.
-	SCB_SHPR3_PRI_15_Pos = 0x18       // Position of PRI_15 field.
-	SCB_SHPR3_PRI_15_Msk = 0xff000000 // Bit mask of PRI_15 field.
-
-	// SHCSR: System Handler Control and State Register
-	SCB_SHCSR_MEMFAULTACT_Pos                 = 0x0     // Position of MEMFAULTACT field.
-	SCB_SHCSR_MEMFAULTACT_Msk                 = 0x1     // Bit mask of MEMFAULTACT field.
-	SCB_SHCSR_MEMFAULTACT                     = 0x1     // Bit MEMFAULTACT.
-	SCB_SHCSR_MEMFAULTACT_MEMFAULTACT_0       = 0x0     // exception is not active
-	SCB_SHCSR_MEMFAULTACT_MEMFAULTACT_1       = 0x1     // exception is active
-	SCB_SHCSR_BUSFAULTACT_Pos                 = 0x1     // Position of BUSFAULTACT field.
-	SCB_SHCSR_BUSFAULTACT_Msk                 = 0x2     // Bit mask of BUSFAULTACT field.
-	SCB_SHCSR_BUSFAULTACT                     = 0x2     // Bit BUSFAULTACT.
-	SCB_SHCSR_BUSFAULTACT_BUSFAULTACT_0       = 0x0     // exception is not active
-	SCB_SHCSR_BUSFAULTACT_BUSFAULTACT_1       = 0x1     // exception is active
-	SCB_SHCSR_USGFAULTACT_Pos                 = 0x3     // Position of USGFAULTACT field.
-	SCB_SHCSR_USGFAULTACT_Msk                 = 0x8     // Bit mask of USGFAULTACT field.
-	SCB_SHCSR_USGFAULTACT                     = 0x8     // Bit USGFAULTACT.
-	SCB_SHCSR_USGFAULTACT_USGFAULTACT_0       = 0x0     // exception is not active
-	SCB_SHCSR_USGFAULTACT_USGFAULTACT_1       = 0x1     // exception is active
-	SCB_SHCSR_SVCALLACT_Pos                   = 0x7     // Position of SVCALLACT field.
-	SCB_SHCSR_SVCALLACT_Msk                   = 0x80    // Bit mask of SVCALLACT field.
-	SCB_SHCSR_SVCALLACT                       = 0x80    // Bit SVCALLACT.
-	SCB_SHCSR_SVCALLACT_SVCALLACT_0           = 0x0     // exception is not active
-	SCB_SHCSR_SVCALLACT_SVCALLACT_1           = 0x1     // exception is active
-	SCB_SHCSR_MONITORACT_Pos                  = 0x8     // Position of MONITORACT field.
-	SCB_SHCSR_MONITORACT_Msk                  = 0x100   // Bit mask of MONITORACT field.
-	SCB_SHCSR_MONITORACT                      = 0x100   // Bit MONITORACT.
-	SCB_SHCSR_MONITORACT_MONITORACT_0         = 0x0     // exception is not active
-	SCB_SHCSR_MONITORACT_MONITORACT_1         = 0x1     // exception is active
-	SCB_SHCSR_PENDSVACT_Pos                   = 0xa     // Position of PENDSVACT field.
-	SCB_SHCSR_PENDSVACT_Msk                   = 0x400   // Bit mask of PENDSVACT field.
-	SCB_SHCSR_PENDSVACT                       = 0x400   // Bit PENDSVACT.
-	SCB_SHCSR_PENDSVACT_PENDSVACT_0           = 0x0     // exception is not active
-	SCB_SHCSR_PENDSVACT_PENDSVACT_1           = 0x1     // exception is active
-	SCB_SHCSR_SYSTICKACT_Pos                  = 0xb     // Position of SYSTICKACT field.
-	SCB_SHCSR_SYSTICKACT_Msk                  = 0x800   // Bit mask of SYSTICKACT field.
-	SCB_SHCSR_SYSTICKACT                      = 0x800   // Bit SYSTICKACT.
-	SCB_SHCSR_SYSTICKACT_SYSTICKACT_0         = 0x0     // exception is not active
-	SCB_SHCSR_SYSTICKACT_SYSTICKACT_1         = 0x1     // exception is active
-	SCB_SHCSR_USGFAULTPENDED_Pos              = 0xc     // Position of USGFAULTPENDED field.
-	SCB_SHCSR_USGFAULTPENDED_Msk              = 0x1000  // Bit mask of USGFAULTPENDED field.
-	SCB_SHCSR_USGFAULTPENDED                  = 0x1000  // Bit USGFAULTPENDED.
-	SCB_SHCSR_USGFAULTPENDED_USGFAULTPENDED_0 = 0x0     // exception is not pending
-	SCB_SHCSR_USGFAULTPENDED_USGFAULTPENDED_1 = 0x1     // exception is pending
-	SCB_SHCSR_MEMFAULTPENDED_Pos              = 0xd     // Position of MEMFAULTPENDED field.
-	SCB_SHCSR_MEMFAULTPENDED_Msk              = 0x2000  // Bit mask of MEMFAULTPENDED field.
-	SCB_SHCSR_MEMFAULTPENDED                  = 0x2000  // Bit MEMFAULTPENDED.
-	SCB_SHCSR_MEMFAULTPENDED_MEMFAULTPENDED_0 = 0x0     // exception is not pending
-	SCB_SHCSR_MEMFAULTPENDED_MEMFAULTPENDED_1 = 0x1     // exception is pending
-	SCB_SHCSR_BUSFAULTPENDED_Pos              = 0xe     // Position of BUSFAULTPENDED field.
-	SCB_SHCSR_BUSFAULTPENDED_Msk              = 0x4000  // Bit mask of BUSFAULTPENDED field.
-	SCB_SHCSR_BUSFAULTPENDED                  = 0x4000  // Bit BUSFAULTPENDED.
-	SCB_SHCSR_BUSFAULTPENDED_BUSFAULTPENDED_0 = 0x0     // exception is not pending
-	SCB_SHCSR_BUSFAULTPENDED_BUSFAULTPENDED_1 = 0x1     // exception is pending
-	SCB_SHCSR_SVCALLPENDED_Pos                = 0xf     // Position of SVCALLPENDED field.
-	SCB_SHCSR_SVCALLPENDED_Msk                = 0x8000  // Bit mask of SVCALLPENDED field.
-	SCB_SHCSR_SVCALLPENDED                    = 0x8000  // Bit SVCALLPENDED.
-	SCB_SHCSR_SVCALLPENDED_SVCALLPENDED_0     = 0x0     // exception is not pending
-	SCB_SHCSR_SVCALLPENDED_SVCALLPENDED_1     = 0x1     // exception is pending
-	SCB_SHCSR_MEMFAULTENA_Pos                 = 0x10    // Position of MEMFAULTENA field.
-	SCB_SHCSR_MEMFAULTENA_Msk                 = 0x10000 // Bit mask of MEMFAULTENA field.
-	SCB_SHCSR_MEMFAULTENA                     = 0x10000 // Bit MEMFAULTENA.
-	SCB_SHCSR_MEMFAULTENA_MEMFAULTENA_0       = 0x0     // disable the exception
-	SCB_SHCSR_MEMFAULTENA_MEMFAULTENA_1       = 0x1     // enable the exception
-	SCB_SHCSR_BUSFAULTENA_Pos                 = 0x11    // Position of BUSFAULTENA field.
-	SCB_SHCSR_BUSFAULTENA_Msk                 = 0x20000 // Bit mask of BUSFAULTENA field.
-	SCB_SHCSR_BUSFAULTENA                     = 0x20000 // Bit BUSFAULTENA.
-	SCB_SHCSR_BUSFAULTENA_BUSFAULTENA_0       = 0x0     // disable the exception
-	SCB_SHCSR_BUSFAULTENA_BUSFAULTENA_1       = 0x1     // enable the exception
-	SCB_SHCSR_USGFAULTENA_Pos                 = 0x12    // Position of USGFAULTENA field.
-	SCB_SHCSR_USGFAULTENA_Msk                 = 0x40000 // Bit mask of USGFAULTENA field.
-	SCB_SHCSR_USGFAULTENA                     = 0x40000 // Bit USGFAULTENA.
-	SCB_SHCSR_USGFAULTENA_USGFAULTENA_0       = 0x0     // disable the exception
-	SCB_SHCSR_USGFAULTENA_USGFAULTENA_1       = 0x1     // enable the exception
-
-	// CFSR: Configurable Fault Status Register
-	SCB_CFSR_IACCVIOL_Pos              = 0x0       // Position of IACCVIOL field.
-	SCB_CFSR_IACCVIOL_Msk              = 0x1       // Bit mask of IACCVIOL field.
-	SCB_CFSR_IACCVIOL                  = 0x1       // Bit IACCVIOL.
-	SCB_CFSR_IACCVIOL_IACCVIOL_0       = 0x0       // no instruction access violation fault
-	SCB_CFSR_IACCVIOL_IACCVIOL_1       = 0x1       // the processor attempted an instruction fetch from a location that does not permit execution
-	SCB_CFSR_DACCVIOL_Pos              = 0x1       // Position of DACCVIOL field.
-	SCB_CFSR_DACCVIOL_Msk              = 0x2       // Bit mask of DACCVIOL field.
-	SCB_CFSR_DACCVIOL                  = 0x2       // Bit DACCVIOL.
-	SCB_CFSR_DACCVIOL_DACCVIOL_0       = 0x0       // no data access violation fault
-	SCB_CFSR_DACCVIOL_DACCVIOL_1       = 0x1       // the processor attempted a load or store at a location that does not permit the operation
-	SCB_CFSR_MUNSTKERR_Pos             = 0x3       // Position of MUNSTKERR field.
-	SCB_CFSR_MUNSTKERR_Msk             = 0x8       // Bit mask of MUNSTKERR field.
-	SCB_CFSR_MUNSTKERR                 = 0x8       // Bit MUNSTKERR.
-	SCB_CFSR_MUNSTKERR_MUNSTKERR_0     = 0x0       // no unstacking fault
-	SCB_CFSR_MUNSTKERR_MUNSTKERR_1     = 0x1       // unstack for an exception return has caused one or more access violations
-	SCB_CFSR_MSTKERR_Pos               = 0x4       // Position of MSTKERR field.
-	SCB_CFSR_MSTKERR_Msk               = 0x10      // Bit mask of MSTKERR field.
-	SCB_CFSR_MSTKERR                   = 0x10      // Bit MSTKERR.
-	SCB_CFSR_MSTKERR_MSTKERR_0         = 0x0       // no stacking fault
-	SCB_CFSR_MSTKERR_MSTKERR_1         = 0x1       // stacking for an exception entry has caused one or more access violations
-	SCB_CFSR_MLSPERR_Pos               = 0x5       // Position of MLSPERR field.
-	SCB_CFSR_MLSPERR_Msk               = 0x20      // Bit mask of MLSPERR field.
-	SCB_CFSR_MLSPERR                   = 0x20      // Bit MLSPERR.
-	SCB_CFSR_MLSPERR_MLSPERR_0         = 0x0       // No MemManage fault occurred during floating-point lazy state preservation
-	SCB_CFSR_MLSPERR_MLSPERR_1         = 0x1       // A MemManage fault occurred during floating-point lazy state preservation
-	SCB_CFSR_MMARVALID_Pos             = 0x7       // Position of MMARVALID field.
-	SCB_CFSR_MMARVALID_Msk             = 0x80      // Bit mask of MMARVALID field.
-	SCB_CFSR_MMARVALID                 = 0x80      // Bit MMARVALID.
-	SCB_CFSR_MMARVALID_MMARVALID_0     = 0x0       // value in MMAR is not a valid fault address
-	SCB_CFSR_MMARVALID_MMARVALID_1     = 0x1       // MMAR holds a valid fault address
-	SCB_CFSR_IBUSERR_Pos               = 0x8       // Position of IBUSERR field.
-	SCB_CFSR_IBUSERR_Msk               = 0x100     // Bit mask of IBUSERR field.
-	SCB_CFSR_IBUSERR                   = 0x100     // Bit IBUSERR.
-	SCB_CFSR_IBUSERR_IBUSERR_0         = 0x0       // no instruction bus error
-	SCB_CFSR_IBUSERR_IBUSERR_1         = 0x1       // instruction bus error
-	SCB_CFSR_PRECISERR_Pos             = 0x9       // Position of PRECISERR field.
-	SCB_CFSR_PRECISERR_Msk             = 0x200     // Bit mask of PRECISERR field.
-	SCB_CFSR_PRECISERR                 = 0x200     // Bit PRECISERR.
-	SCB_CFSR_PRECISERR_PRECISERR_0     = 0x0       // no precise data bus error
-	SCB_CFSR_PRECISERR_PRECISERR_1     = 0x1       // a data bus error has occurred, and the PC value stacked for the exception return points to the instruction that caused the fault
-	SCB_CFSR_IMPRECISERR_Pos           = 0xa       // Position of IMPRECISERR field.
-	SCB_CFSR_IMPRECISERR_Msk           = 0x400     // Bit mask of IMPRECISERR field.
-	SCB_CFSR_IMPRECISERR               = 0x400     // Bit IMPRECISERR.
-	SCB_CFSR_IMPRECISERR_IMPRECISERR_0 = 0x0       // no imprecise data bus error
-	SCB_CFSR_IMPRECISERR_IMPRECISERR_1 = 0x1       // a data bus error has occurred, but the return address in the stack frame is not related to the instruction that caused the error
-	SCB_CFSR_UNSTKERR_Pos              = 0xb       // Position of UNSTKERR field.
-	SCB_CFSR_UNSTKERR_Msk              = 0x800     // Bit mask of UNSTKERR field.
-	SCB_CFSR_UNSTKERR                  = 0x800     // Bit UNSTKERR.
-	SCB_CFSR_UNSTKERR_UNSTKERR_0       = 0x0       // no unstacking fault
-	SCB_CFSR_UNSTKERR_UNSTKERR_1       = 0x1       // unstack for an exception return has caused one or more BusFaults
-	SCB_CFSR_STKERR_Pos                = 0xc       // Position of STKERR field.
-	SCB_CFSR_STKERR_Msk                = 0x1000    // Bit mask of STKERR field.
-	SCB_CFSR_STKERR                    = 0x1000    // Bit STKERR.
-	SCB_CFSR_STKERR_STKERR_0           = 0x0       // no stacking fault
-	SCB_CFSR_STKERR_STKERR_1           = 0x1       // stacking for an exception entry has caused one or more BusFaults
-	SCB_CFSR_LSPERR_Pos                = 0xd       // Position of LSPERR field.
-	SCB_CFSR_LSPERR_Msk                = 0x2000    // Bit mask of LSPERR field.
-	SCB_CFSR_LSPERR                    = 0x2000    // Bit LSPERR.
-	SCB_CFSR_LSPERR_LSPERR_0           = 0x0       // No bus fault occurred during floating-point lazy state preservation
-	SCB_CFSR_LSPERR_LSPERR_1           = 0x1       // A bus fault occurred during floating-point lazy state preservation
-	SCB_CFSR_BFARVALID_Pos             = 0xf       // Position of BFARVALID field.
-	SCB_CFSR_BFARVALID_Msk             = 0x8000    // Bit mask of BFARVALID field.
-	SCB_CFSR_BFARVALID                 = 0x8000    // Bit BFARVALID.
-	SCB_CFSR_BFARVALID_BFARVALID_0     = 0x0       // value in BFAR is not a valid fault address
-	SCB_CFSR_BFARVALID_BFARVALID_1     = 0x1       // BFAR holds a valid fault address
-	SCB_CFSR_UNDEFINSTR_Pos            = 0x10      // Position of UNDEFINSTR field.
-	SCB_CFSR_UNDEFINSTR_Msk            = 0x10000   // Bit mask of UNDEFINSTR field.
-	SCB_CFSR_UNDEFINSTR                = 0x10000   // Bit UNDEFINSTR.
-	SCB_CFSR_UNDEFINSTR_UNDEFINSTR_0   = 0x0       // no undefined instruction UsageFault
-	SCB_CFSR_UNDEFINSTR_UNDEFINSTR_1   = 0x1       // the processor has attempted to execute an undefined instruction
-	SCB_CFSR_INVSTATE_Pos              = 0x11      // Position of INVSTATE field.
-	SCB_CFSR_INVSTATE_Msk              = 0x20000   // Bit mask of INVSTATE field.
-	SCB_CFSR_INVSTATE                  = 0x20000   // Bit INVSTATE.
-	SCB_CFSR_INVSTATE_INVSTATE_0       = 0x0       // no invalid state UsageFault
-	SCB_CFSR_INVSTATE_INVSTATE_1       = 0x1       // the processor has attempted to execute an instruction that makes illegal use of the EPSR
-	SCB_CFSR_INVPC_Pos                 = 0x12      // Position of INVPC field.
-	SCB_CFSR_INVPC_Msk                 = 0x40000   // Bit mask of INVPC field.
-	SCB_CFSR_INVPC                     = 0x40000   // Bit INVPC.
-	SCB_CFSR_INVPC_INVPC_0             = 0x0       // no invalid PC load UsageFault
-	SCB_CFSR_INVPC_INVPC_1             = 0x1       // the processor has attempted an illegal load of EXC_RETURN to the PC
-	SCB_CFSR_NOCP_Pos                  = 0x13      // Position of NOCP field.
-	SCB_CFSR_NOCP_Msk                  = 0x80000   // Bit mask of NOCP field.
-	SCB_CFSR_NOCP                      = 0x80000   // Bit NOCP.
-	SCB_CFSR_NOCP_NOCP_0               = 0x0       // no UsageFault caused by attempting to access a coprocessor
-	SCB_CFSR_NOCP_NOCP_1               = 0x1       // the processor has attempted to access a coprocessor
-	SCB_CFSR_UNALIGNED_Pos             = 0x18      // Position of UNALIGNED field.
-	SCB_CFSR_UNALIGNED_Msk             = 0x1000000 // Bit mask of UNALIGNED field.
-	SCB_CFSR_UNALIGNED                 = 0x1000000 // Bit UNALIGNED.
-	SCB_CFSR_UNALIGNED_UNALIGNED_0     = 0x0       // no unaligned access fault, or unaligned access trapping not enabled
-	SCB_CFSR_UNALIGNED_UNALIGNED_1     = 0x1       // the processor has made an unaligned memory access
-	SCB_CFSR_DIVBYZERO_Pos             = 0x19      // Position of DIVBYZERO field.
-	SCB_CFSR_DIVBYZERO_Msk             = 0x2000000 // Bit mask of DIVBYZERO field.
-	SCB_CFSR_DIVBYZERO                 = 0x2000000 // Bit DIVBYZERO.
-	SCB_CFSR_DIVBYZERO_DIVBYZERO_0     = 0x0       // no divide by zero fault, or divide by zero trapping not enabled
-	SCB_CFSR_DIVBYZERO_DIVBYZERO_1     = 0x1       // the processor has executed an SDIV or UDIV instruction with a divisor of 0
-
-	// HFSR: HardFault Status register
-	SCB_HFSR_VECTTBL_Pos         = 0x1        // Position of VECTTBL field.
-	SCB_HFSR_VECTTBL_Msk         = 0x2        // Bit mask of VECTTBL field.
-	SCB_HFSR_VECTTBL             = 0x2        // Bit VECTTBL.
-	SCB_HFSR_VECTTBL_VECTTBL_0   = 0x0        // no BusFault on vector table read
-	SCB_HFSR_VECTTBL_VECTTBL_1   = 0x1        // BusFault on vector table read
-	SCB_HFSR_FORCED_Pos          = 0x1e       // Position of FORCED field.
-	SCB_HFSR_FORCED_Msk          = 0x40000000 // Bit mask of FORCED field.
-	SCB_HFSR_FORCED              = 0x40000000 // Bit FORCED.
-	SCB_HFSR_FORCED_FORCED_0     = 0x0        // no forced HardFault
-	SCB_HFSR_FORCED_FORCED_1     = 0x1        // forced HardFault
-	SCB_HFSR_DEBUGEVT_Pos        = 0x1f       // Position of DEBUGEVT field.
-	SCB_HFSR_DEBUGEVT_Msk        = 0x80000000 // Bit mask of DEBUGEVT field.
-	SCB_HFSR_DEBUGEVT            = 0x80000000 // Bit DEBUGEVT.
-	SCB_HFSR_DEBUGEVT_DEBUGEVT_0 = 0x0        // No Debug event has occurred.
-	SCB_HFSR_DEBUGEVT_DEBUGEVT_1 = 0x1        // Debug event has occurred. The Debug Fault Status Register has been updated.
-
-	// DFSR: Debug Fault Status Register
-	SCB_DFSR_HALTED_Pos          = 0x0  // Position of HALTED field.
-	SCB_DFSR_HALTED_Msk          = 0x1  // Bit mask of HALTED field.
-	SCB_DFSR_HALTED              = 0x1  // Bit HALTED.
-	SCB_DFSR_HALTED_HALTED_0     = 0x0  // No active halt request debug event
-	SCB_DFSR_HALTED_HALTED_1     = 0x1  // Halt request debug event active
-	SCB_DFSR_BKPT_Pos            = 0x1  // Position of BKPT field.
-	SCB_DFSR_BKPT_Msk            = 0x2  // Bit mask of BKPT field.
-	SCB_DFSR_BKPT                = 0x2  // Bit BKPT.
-	SCB_DFSR_BKPT_BKPT_0         = 0x0  // No current breakpoint debug event
-	SCB_DFSR_BKPT_BKPT_1         = 0x1  // At least one current breakpoint debug event
-	SCB_DFSR_DWTTRAP_Pos         = 0x2  // Position of DWTTRAP field.
-	SCB_DFSR_DWTTRAP_Msk         = 0x4  // Bit mask of DWTTRAP field.
-	SCB_DFSR_DWTTRAP             = 0x4  // Bit DWTTRAP.
-	SCB_DFSR_DWTTRAP_DWTTRAP_0   = 0x0  // No current debug events generated by the DWT
-	SCB_DFSR_DWTTRAP_DWTTRAP_1   = 0x1  // At least one current debug event generated by the DWT
-	SCB_DFSR_VCATCH_Pos          = 0x3  // Position of VCATCH field.
-	SCB_DFSR_VCATCH_Msk          = 0x8  // Bit mask of VCATCH field.
-	SCB_DFSR_VCATCH              = 0x8  // Bit VCATCH.
-	SCB_DFSR_VCATCH_VCATCH_0     = 0x0  // No Vector catch triggered
-	SCB_DFSR_VCATCH_VCATCH_1     = 0x1  // Vector catch triggered
-	SCB_DFSR_EXTERNAL_Pos        = 0x4  // Position of EXTERNAL field.
-	SCB_DFSR_EXTERNAL_Msk        = 0x10 // Bit mask of EXTERNAL field.
-	SCB_DFSR_EXTERNAL            = 0x10 // Bit EXTERNAL.
-	SCB_DFSR_EXTERNAL_EXTERNAL_0 = 0x0  // No external debug request debug event
-	SCB_DFSR_EXTERNAL_EXTERNAL_1 = 0x1  // External debug request debug event
-
-	// MMFAR: MemManage Fault Address Register
-	SCB_MMFAR_ADDRESS_Pos = 0x0        // Position of ADDRESS field.
-	SCB_MMFAR_ADDRESS_Msk = 0xffffffff // Bit mask of ADDRESS field.
-
-	// BFAR: BusFault Address Register
-	SCB_BFAR_ADDRESS_Pos = 0x0        // Position of ADDRESS field.
-	SCB_BFAR_ADDRESS_Msk = 0xffffffff // Bit mask of ADDRESS field.
-)
@@ -1,36 +0,0 @@
-package arm64
-
-// Run the given assembly code. The code will be marked as having side effects,
-// as it doesn't produce output and thus would normally be eliminated by the
-// optimizer.
-func Asm(asm string)
-
-// Run the given inline assembly. The code will be marked as having side
-// effects, as it would otherwise be optimized away. The inline assembly string
-// recognizes template values in the form {name}, like so:
-//
-//     arm.AsmFull(
-//         "str {value}, {result}",
-//         map[string]interface{}{
-//             "value":  1
-//             "result": &dest,
-//         })
-//
-// You can use {} in the asm string (which expands to a register) to set the
-// return value.
-func AsmFull(asm string, regs map[string]interface{}) uintptr
-
-// Run the following system call (SVCall) with 0 arguments.
-func SVCall0(num uintptr) uintptr
-
-// Run the following system call (SVCall) with 1 argument.
-func SVCall1(num uintptr, a1 interface{}) uintptr
-
-// Run the following system call (SVCall) with 2 arguments.
-func SVCall2(num uintptr, a1, a2 interface{}) uintptr
-
-// Run the following system call (SVCall) with 3 arguments.
-func SVCall3(num uintptr, a1, a2, a3 interface{}) uintptr
-
-// Run the following system call (SVCall) with 4 arguments.
-func SVCall4(num uintptr, a1, a2, a3, a4 interface{}) uintptr
@@ -1,21 +0,0 @@
-package device
-
-// Run the given assembly code. The code will be marked as having side effects,
-// as it doesn't produce output and thus would normally be eliminated by the
-// optimizer.
-func Asm(asm string)
-
-// Run the given inline assembly. The code will be marked as having side
-// effects, as it would otherwise be optimized away. The inline assembly string
-// recognizes template values in the form {name}, like so:
-//
-//     arm.AsmFull(
-//         "str {value}, {result}",
-//         map[string]interface{}{
-//             "value":  1
-//             "result": &dest,
-//         })
-//
-// You can use {} in the asm string (which expands to a register) to set the
-// return value.
-func AsmFull(asm string, regs map[string]interface{}) uintptr
@@ -1,52 +0,0 @@
-
-// The following definitions were copied from:
-// esp-idf/components/xtensa/include/xtensa/corebits.h
-#define PS_WOE_MASK                0x00040000
-#define PS_OWB_MASK                0x00000F00
-#define PS_CALLINC_MASK            0x00030000
-#define PS_WOE                     PS_WOE_MASK
-
-// Only calling it call_start_cpu0 for consistency with ESP-IDF.
-.section .text.call_start_cpu0
-1:
-    .long _stack_top
-.global call_start_cpu0
-call_start_cpu0:
-    // We need to set the stack pointer to a different value. This is somewhat
-    // complicated in the Xtensa architecture. The code below is a modified
-    // version of the following code:
-    // https://github.com/espressif/esp-idf/blob/c77c4ccf/components/xtensa/include/xt_instr_macros.h#L47
-
-    // Disable WOE.
-    rsr.ps a2
-    movi a3, ~(PS_WOE_MASK)
-    and a2, a2, a3
-    wsr.ps a2
-    rsync
-
-    // Set WINDOWBASE to 1 << WINDOWSTART.
-    rsr.windowbase  a2
-    ssl  a2
-    movi a2, 1
-    sll  a2, a2
-    wsr.windowstart a2
-    rsync
-
-    // Load new stack pointer.
-    l32r sp, 1b
-
-    // Re-enable WOE.
-    rsr.ps a2
-    movi a3, PS_WOE
-    or a2, a2, a3
-    wsr.ps a2
-    rsync
-
-    // Jump to the runtime start function written in Go.
-    j main
-
-.section .text.tinygo_scanCurrentStack
-.global tinygo_scanCurrentStack
-tinygo_scanCurrentStack:
-    // TODO: save callee saved registers on the stack
-    j tinygo_scanstack
@@ -1,6 +0,0 @@
-
-.section .text.tinygo_scanCurrentStack
-.global tinygo_scanCurrentStack
-tinygo_scanCurrentStack:
-    // TODO: save callee saved registers on the stack
-    j tinygo_scanstack
@@ -1,29 +0,0 @@
-// Hand created file. DO NOT DELETE.
-// Hardfault aliases for definitions that have inconsistent naming (which are
-// auto-generated by gen-device-svd.go) among devices in package nxp.
-
-// +build nxp,!mimxrt1062
-
-package nxp
-
-const (
-	HardFault_CFSR_IACCVIOL    = SystemControl_CFSR_IACCVIOL
-	HardFault_CFSR_DACCVIOL    = SystemControl_CFSR_DACCVIOL
-	HardFault_CFSR_MUNSTKERR   = SystemControl_CFSR_MUNSTKERR
-	HardFault_CFSR_MSTKERR     = SystemControl_CFSR_MSTKERR
-	HardFault_CFSR_MLSPERR     = SystemControl_CFSR_MLSPERR
-	HardFault_CFSR_IBUSERR     = SystemControl_CFSR_IBUSERR
-	HardFault_CFSR_PRECISERR   = SystemControl_CFSR_PRECISERR
-	HardFault_CFSR_IMPRECISERR = SystemControl_CFSR_IMPRECISERR
-	HardFault_CFSR_UNSTKERR    = SystemControl_CFSR_UNSTKERR
-	HardFault_CFSR_STKERR      = SystemControl_CFSR_STKERR
-	HardFault_CFSR_LSPERR      = SystemControl_CFSR_LSPERR
-	HardFault_CFSR_UNDEFINSTR  = SystemControl_CFSR_UNDEFINSTR
-	HardFault_CFSR_INVSTATE    = SystemControl_CFSR_INVSTATE
-	HardFault_CFSR_INVPC       = SystemControl_CFSR_INVPC
-	HardFault_CFSR_NOCP        = SystemControl_CFSR_NOCP
-	HardFault_CFSR_UNALIGNED   = SystemControl_CFSR_UNALIGNED
-	HardFault_CFSR_DIVBYZERO   = SystemControl_CFSR_DIVBYZERO
-	HardFault_CFSR_MMARVALID   = SystemControl_CFSR_MMARVALID
-	HardFault_CFSR_BFARVALID   = SystemControl_CFSR_BFARVALID
-)
@@ -1,529 +0,0 @@
-// Hand created file. DO NOT DELETE.
-// Type definitions, fields, and constants associated with various clocks and
-// peripherals of the NXP MIMXRT1062.
-
-// +build nxp,mimxrt1062
-
-package nxp
-
-import (
-	"runtime/volatile"
-	"unsafe"
-)
-
-// Clock represents an individual peripheral clock that may be enabled/disabled
-// at runtime. Clocks also have a method `Mux` for selecting the clock source
-// and a method `Div` for selecting the hardware divisor. Note that many
-// peripherals have an independent prescalar configuration applied to the output
-// of this divisor.
-type (
-	Clock     uint32
-	ClockMode uint8
-)
-
-// Enable activates or deactivates the clock gate of receiver Clock c.
-func (c Clock) Enable(enable bool) {
-	if enable {
-		c.setGate(clockNeededRunWait)
-	} else {
-		c.setGate(clockNotNeeded)
-	}
-}
-
-// Mux selects a clock source for the mux of the receiver Clock c.
-func (c Clock) Mux(mux uint32) { c.setCcm(mux) }
-
-// Div configures the prescalar divisor of the receiver Clock c.
-func (c Clock) Div(div uint32) { c.setCcm(div) }
-
-const (
-	ClockModeRun  ClockMode = 0 // Remain in run mode
-	ClockModeWait ClockMode = 1 // Transfer to wait mode
-	ClockModeStop ClockMode = 2 // Transfer to stop mode
-)
-
-// Set configures the run mode of the MCU.
-func (m ClockMode) Set() {
-	CCM.CLPCR.Set((CCM.CLPCR.Get() & ^uint32(CCM_CLPCR_LPM_Msk)) |
-		((uint32(m) << CCM_CLPCR_LPM_Pos) & CCM_CLPCR_LPM_Msk))
-}
-
-// Named oscillators
-const (
-	ClockCpu         Clock = 0x0  // CPU clock
-	ClockAhb         Clock = 0x1  // AHB clock
-	ClockSemc        Clock = 0x2  // SEMC clock
-	ClockIpg         Clock = 0x3  // IPG clock
-	ClockPer         Clock = 0x4  // PER clock
-	ClockOsc         Clock = 0x5  // OSC clock selected by PMU_LOWPWR_CTRL[OSC_SEL]
-	ClockRtc         Clock = 0x6  // RTC clock (RTCCLK)
-	ClockArmPll      Clock = 0x7  // ARMPLLCLK
-	ClockUsb1Pll     Clock = 0x8  // USB1PLLCLK
-	ClockUsb1PllPfd0 Clock = 0x9  // USB1PLLPDF0CLK
-	ClockUsb1PllPfd1 Clock = 0xA  // USB1PLLPFD1CLK
-	ClockUsb1PllPfd2 Clock = 0xB  // USB1PLLPFD2CLK
-	ClockUsb1PllPfd3 Clock = 0xC  // USB1PLLPFD3CLK
-	ClockUsb2Pll     Clock = 0xD  // USB2PLLCLK
-	ClockSysPll      Clock = 0xE  // SYSPLLCLK
-	ClockSysPllPfd0  Clock = 0xF  // SYSPLLPDF0CLK
-	ClockSysPllPfd1  Clock = 0x10 // SYSPLLPFD1CLK
-	ClockSysPllPfd2  Clock = 0x11 // SYSPLLPFD2CLK
-	ClockSysPllPfd3  Clock = 0x12 // SYSPLLPFD3CLK
-	ClockEnetPll0    Clock = 0x13 // Enet PLLCLK ref_enetpll0
-	ClockEnetPll1    Clock = 0x14 // Enet PLLCLK ref_enetpll1
-	ClockEnetPll2    Clock = 0x15 // Enet PLLCLK ref_enetpll2
-	ClockAudioPll    Clock = 0x16 // Audio PLLCLK
-	ClockVideoPll    Clock = 0x17 // Video PLLCLK
-)
-
-// Named clocks of integrated peripherals
-const (
-	ClockIpAipsTz1     Clock = (0 << 8) | CCM_CCGR0_CG0_Pos  // CCGR0, CG0
-	ClockIpAipsTz2     Clock = (0 << 8) | CCM_CCGR0_CG1_Pos  // CCGR0, CG1
-	ClockIpMqs         Clock = (0 << 8) | CCM_CCGR0_CG2_Pos  // CCGR0, CG2
-	ClockIpFlexSpiExsc Clock = (0 << 8) | CCM_CCGR0_CG3_Pos  // CCGR0, CG3
-	ClockIpSimMMain    Clock = (0 << 8) | CCM_CCGR0_CG4_Pos  // CCGR0, CG4
-	ClockIpDcp         Clock = (0 << 8) | CCM_CCGR0_CG5_Pos  // CCGR0, CG5
-	ClockIpLpuart3     Clock = (0 << 8) | CCM_CCGR0_CG6_Pos  // CCGR0, CG6
-	ClockIpCan1        Clock = (0 << 8) | CCM_CCGR0_CG7_Pos  // CCGR0, CG7
-	ClockIpCan1S       Clock = (0 << 8) | CCM_CCGR0_CG8_Pos  // CCGR0, CG8
-	ClockIpCan2        Clock = (0 << 8) | CCM_CCGR0_CG9_Pos  // CCGR0, CG9
-	ClockIpCan2S       Clock = (0 << 8) | CCM_CCGR0_CG10_Pos // CCGR0, CG10
-	ClockIpTrace       Clock = (0 << 8) | CCM_CCGR0_CG11_Pos // CCGR0, CG11
-	ClockIpGpt2        Clock = (0 << 8) | CCM_CCGR0_CG12_Pos // CCGR0, CG12
-	ClockIpGpt2S       Clock = (0 << 8) | CCM_CCGR0_CG13_Pos // CCGR0, CG13
-	ClockIpLpuart2     Clock = (0 << 8) | CCM_CCGR0_CG14_Pos // CCGR0, CG14
-	ClockIpGpio2       Clock = (0 << 8) | CCM_CCGR0_CG15_Pos // CCGR0, CG15
-
-	ClockIpLpspi1   Clock = (1 << 8) | CCM_CCGR1_CG0_Pos  // CCGR1, CG0
-	ClockIpLpspi2   Clock = (1 << 8) | CCM_CCGR1_CG1_Pos  // CCGR1, CG1
-	ClockIpLpspi3   Clock = (1 << 8) | CCM_CCGR1_CG2_Pos  // CCGR1, CG2
-	ClockIpLpspi4   Clock = (1 << 8) | CCM_CCGR1_CG3_Pos  // CCGR1, CG3
-	ClockIpAdc2     Clock = (1 << 8) | CCM_CCGR1_CG4_Pos  // CCGR1, CG4
-	ClockIpEnet     Clock = (1 << 8) | CCM_CCGR1_CG5_Pos  // CCGR1, CG5
-	ClockIpPit      Clock = (1 << 8) | CCM_CCGR1_CG6_Pos  // CCGR1, CG6
-	ClockIpAoi2     Clock = (1 << 8) | CCM_CCGR1_CG7_Pos  // CCGR1, CG7
-	ClockIpAdc1     Clock = (1 << 8) | CCM_CCGR1_CG8_Pos  // CCGR1, CG8
-	ClockIpSemcExsc Clock = (1 << 8) | CCM_CCGR1_CG9_Pos  // CCGR1, CG9
-	ClockIpGpt1     Clock = (1 << 8) | CCM_CCGR1_CG10_Pos // CCGR1, CG10
-	ClockIpGpt1S    Clock = (1 << 8) | CCM_CCGR1_CG11_Pos // CCGR1, CG11
-	ClockIpLpuart4  Clock = (1 << 8) | CCM_CCGR1_CG12_Pos // CCGR1, CG12
-	ClockIpGpio1    Clock = (1 << 8) | CCM_CCGR1_CG13_Pos // CCGR1, CG13
-	ClockIpCsu      Clock = (1 << 8) | CCM_CCGR1_CG14_Pos // CCGR1, CG14
-	ClockIpGpio5    Clock = (1 << 8) | CCM_CCGR1_CG15_Pos // CCGR1, CG15
-
-	ClockIpOcramExsc  Clock = (2 << 8) | CCM_CCGR2_CG0_Pos  // CCGR2, CG0
-	ClockIpCsi        Clock = (2 << 8) | CCM_CCGR2_CG1_Pos  // CCGR2, CG1
-	ClockIpIomuxcSnvs Clock = (2 << 8) | CCM_CCGR2_CG2_Pos  // CCGR2, CG2
-	ClockIpLpi2c1     Clock = (2 << 8) | CCM_CCGR2_CG3_Pos  // CCGR2, CG3
-	ClockIpLpi2c2     Clock = (2 << 8) | CCM_CCGR2_CG4_Pos  // CCGR2, CG4
-	ClockIpLpi2c3     Clock = (2 << 8) | CCM_CCGR2_CG5_Pos  // CCGR2, CG5
-	ClockIpOcotp      Clock = (2 << 8) | CCM_CCGR2_CG6_Pos  // CCGR2, CG6
-	ClockIpXbar3      Clock = (2 << 8) | CCM_CCGR2_CG7_Pos  // CCGR2, CG7
-	ClockIpIpmux1     Clock = (2 << 8) | CCM_CCGR2_CG8_Pos  // CCGR2, CG8
-	ClockIpIpmux2     Clock = (2 << 8) | CCM_CCGR2_CG9_Pos  // CCGR2, CG9
-	ClockIpIpmux3     Clock = (2 << 8) | CCM_CCGR2_CG10_Pos // CCGR2, CG10
-	ClockIpXbar1      Clock = (2 << 8) | CCM_CCGR2_CG11_Pos // CCGR2, CG11
-	ClockIpXbar2      Clock = (2 << 8) | CCM_CCGR2_CG12_Pos // CCGR2, CG12
-	ClockIpGpio3      Clock = (2 << 8) | CCM_CCGR2_CG13_Pos // CCGR2, CG13
-	ClockIpLcd        Clock = (2 << 8) | CCM_CCGR2_CG14_Pos // CCGR2, CG14
-	ClockIpPxp        Clock = (2 << 8) | CCM_CCGR2_CG15_Pos // CCGR2, CG15
-
-	ClockIpFlexio2       Clock = (3 << 8) | CCM_CCGR3_CG0_Pos  // CCGR3, CG0
-	ClockIpLpuart5       Clock = (3 << 8) | CCM_CCGR3_CG1_Pos  // CCGR3, CG1
-	ClockIpSemc          Clock = (3 << 8) | CCM_CCGR3_CG2_Pos  // CCGR3, CG2
-	ClockIpLpuart6       Clock = (3 << 8) | CCM_CCGR3_CG3_Pos  // CCGR3, CG3
-	ClockIpAoi1          Clock = (3 << 8) | CCM_CCGR3_CG4_Pos  // CCGR3, CG4
-	ClockIpLcdPixel      Clock = (3 << 8) | CCM_CCGR3_CG5_Pos  // CCGR3, CG5
-	ClockIpGpio4         Clock = (3 << 8) | CCM_CCGR3_CG6_Pos  // CCGR3, CG6
-	ClockIpEwm0          Clock = (3 << 8) | CCM_CCGR3_CG7_Pos  // CCGR3, CG7
-	ClockIpWdog1         Clock = (3 << 8) | CCM_CCGR3_CG8_Pos  // CCGR3, CG8
-	ClockIpFlexRam       Clock = (3 << 8) | CCM_CCGR3_CG9_Pos  // CCGR3, CG9
-	ClockIpAcmp1         Clock = (3 << 8) | CCM_CCGR3_CG10_Pos // CCGR3, CG10
-	ClockIpAcmp2         Clock = (3 << 8) | CCM_CCGR3_CG11_Pos // CCGR3, CG11
-	ClockIpAcmp3         Clock = (3 << 8) | CCM_CCGR3_CG12_Pos // CCGR3, CG12
-	ClockIpAcmp4         Clock = (3 << 8) | CCM_CCGR3_CG13_Pos // CCGR3, CG13
-	ClockIpOcram         Clock = (3 << 8) | CCM_CCGR3_CG14_Pos // CCGR3, CG14
-	ClockIpIomuxcSnvsGpr Clock = (3 << 8) | CCM_CCGR3_CG15_Pos // CCGR3, CG15
-
-	ClockIpIomuxc    Clock = (4 << 8) | CCM_CCGR4_CG1_Pos  // CCGR4, CG1
-	ClockIpIomuxcGpr Clock = (4 << 8) | CCM_CCGR4_CG2_Pos  // CCGR4, CG2
-	ClockIpBee       Clock = (4 << 8) | CCM_CCGR4_CG3_Pos  // CCGR4, CG3
-	ClockIpSimM7     Clock = (4 << 8) | CCM_CCGR4_CG4_Pos  // CCGR4, CG4
-	ClockIpTsc       Clock = (4 << 8) | CCM_CCGR4_CG5_Pos  // CCGR4, CG5
-	ClockIpSimM      Clock = (4 << 8) | CCM_CCGR4_CG6_Pos  // CCGR4, CG6
-	ClockIpSimEms    Clock = (4 << 8) | CCM_CCGR4_CG7_Pos  // CCGR4, CG7
-	ClockIpPwm1      Clock = (4 << 8) | CCM_CCGR4_CG8_Pos  // CCGR4, CG8
-	ClockIpPwm2      Clock = (4 << 8) | CCM_CCGR4_CG9_Pos  // CCGR4, CG9
-	ClockIpPwm3      Clock = (4 << 8) | CCM_CCGR4_CG10_Pos // CCGR4, CG10
-	ClockIpPwm4      Clock = (4 << 8) | CCM_CCGR4_CG11_Pos // CCGR4, CG11
-	ClockIpEnc1      Clock = (4 << 8) | CCM_CCGR4_CG12_Pos // CCGR4, CG12
-	ClockIpEnc2      Clock = (4 << 8) | CCM_CCGR4_CG13_Pos // CCGR4, CG13
-	ClockIpEnc3      Clock = (4 << 8) | CCM_CCGR4_CG14_Pos // CCGR4, CG14
-	ClockIpEnc4      Clock = (4 << 8) | CCM_CCGR4_CG15_Pos // CCGR4, CG15
-
-	ClockIpRom     Clock = (5 << 8) | CCM_CCGR5_CG0_Pos  // CCGR5, CG0
-	ClockIpFlexio1 Clock = (5 << 8) | CCM_CCGR5_CG1_Pos  // CCGR5, CG1
-	ClockIpWdog3   Clock = (5 << 8) | CCM_CCGR5_CG2_Pos  // CCGR5, CG2
-	ClockIpDma     Clock = (5 << 8) | CCM_CCGR5_CG3_Pos  // CCGR5, CG3
-	ClockIpKpp     Clock = (5 << 8) | CCM_CCGR5_CG4_Pos  // CCGR5, CG4
-	ClockIpWdog2   Clock = (5 << 8) | CCM_CCGR5_CG5_Pos  // CCGR5, CG5
-	ClockIpAipsTz4 Clock = (5 << 8) | CCM_CCGR5_CG6_Pos  // CCGR5, CG6
-	ClockIpSpdif   Clock = (5 << 8) | CCM_CCGR5_CG7_Pos  // CCGR5, CG7
-	ClockIpSimMain Clock = (5 << 8) | CCM_CCGR5_CG8_Pos  // CCGR5, CG8
-	ClockIpSai1    Clock = (5 << 8) | CCM_CCGR5_CG9_Pos  // CCGR5, CG9
-	ClockIpSai2    Clock = (5 << 8) | CCM_CCGR5_CG10_Pos // CCGR5, CG10
-	ClockIpSai3    Clock = (5 << 8) | CCM_CCGR5_CG11_Pos // CCGR5, CG11
-	ClockIpLpuart1 Clock = (5 << 8) | CCM_CCGR5_CG12_Pos // CCGR5, CG12
-	ClockIpLpuart7 Clock = (5 << 8) | CCM_CCGR5_CG13_Pos // CCGR5, CG13
-	ClockIpSnvsHp  Clock = (5 << 8) | CCM_CCGR5_CG14_Pos // CCGR5, CG14
-	ClockIpSnvsLp  Clock = (5 << 8) | CCM_CCGR5_CG15_Pos // CCGR5, CG15
-
-	ClockIpUsbOh3  Clock = (6 << 8) | CCM_CCGR6_CG0_Pos  // CCGR6, CG0
-	ClockIpUsdhc1  Clock = (6 << 8) | CCM_CCGR6_CG1_Pos  // CCGR6, CG1
-	ClockIpUsdhc2  Clock = (6 << 8) | CCM_CCGR6_CG2_Pos  // CCGR6, CG2
-	ClockIpDcdc    Clock = (6 << 8) | CCM_CCGR6_CG3_Pos  // CCGR6, CG3
-	ClockIpIpmux4  Clock = (6 << 8) | CCM_CCGR6_CG4_Pos  // CCGR6, CG4
-	ClockIpFlexSpi Clock = (6 << 8) | CCM_CCGR6_CG5_Pos  // CCGR6, CG5
-	ClockIpTrng    Clock = (6 << 8) | CCM_CCGR6_CG6_Pos  // CCGR6, CG6
-	ClockIpLpuart8 Clock = (6 << 8) | CCM_CCGR6_CG7_Pos  // CCGR6, CG7
-	ClockIpTimer4  Clock = (6 << 8) | CCM_CCGR6_CG8_Pos  // CCGR6, CG8
-	ClockIpAipsTz3 Clock = (6 << 8) | CCM_CCGR6_CG9_Pos  // CCGR6, CG9
-	ClockIpSimPer  Clock = (6 << 8) | CCM_CCGR6_CG10_Pos // CCGR6, CG10
-	ClockIpAnadig  Clock = (6 << 8) | CCM_CCGR6_CG11_Pos // CCGR6, CG11
-	ClockIpLpi2c4  Clock = (6 << 8) | CCM_CCGR6_CG12_Pos // CCGR6, CG12
-	ClockIpTimer1  Clock = (6 << 8) | CCM_CCGR6_CG13_Pos // CCGR6, CG13
-	ClockIpTimer2  Clock = (6 << 8) | CCM_CCGR6_CG14_Pos // CCGR6, CG14
-	ClockIpTimer3  Clock = (6 << 8) | CCM_CCGR6_CG15_Pos // CCGR6, CG15
-
-	ClockIpEnet2    Clock = (7 << 8) | CCM_CCGR7_CG0_Pos // CCGR7, CG0
-	ClockIpFlexSpi2 Clock = (7 << 8) | CCM_CCGR7_CG1_Pos // CCGR7, CG1
-	ClockIpAxbsL    Clock = (7 << 8) | CCM_CCGR7_CG2_Pos // CCGR7, CG2
-	ClockIpCan3     Clock = (7 << 8) | CCM_CCGR7_CG3_Pos // CCGR7, CG3
-	ClockIpCan3S    Clock = (7 << 8) | CCM_CCGR7_CG4_Pos // CCGR7, CG4
-	ClockIpAipsLite Clock = (7 << 8) | CCM_CCGR7_CG5_Pos // CCGR7, CG5
-	ClockIpFlexio3  Clock = (7 << 8) | CCM_CCGR7_CG6_Pos // CCGR7, CG6
-)
-
-// PLL name
-const (
-	ClockPllArm     Clock = ((offPllArm & 0xFFF) << 16) | CCM_ANALOG_PLL_ARM_ENABLE_Pos            // PLL ARM
-	ClockPllSys     Clock = ((offPllSys & 0xFFF) << 16) | CCM_ANALOG_PLL_SYS_ENABLE_Pos            // PLL SYS
-	ClockPllUsb1    Clock = ((offPllUsb1 & 0xFFF) << 16) | CCM_ANALOG_PLL_USB1_ENABLE_Pos          // PLL USB1
-	ClockPllAudio   Clock = ((offPllAudio & 0xFFF) << 16) | CCM_ANALOG_PLL_AUDIO_ENABLE_Pos        // PLL Audio
-	ClockPllVideo   Clock = ((offPllVideo & 0xFFF) << 16) | CCM_ANALOG_PLL_VIDEO_ENABLE_Pos        // PLL Video
-	ClockPllEnet    Clock = ((offPllEnet & 0xFFF) << 16) | CCM_ANALOG_PLL_ENET_ENABLE_Pos          // PLL Enet0
-	ClockPllEnet2   Clock = ((offPllEnet & 0xFFF) << 16) | CCM_ANALOG_PLL_ENET_ENET2_REF_EN_Pos    // PLL Enet1
-	ClockPllEnet25M Clock = ((offPllEnet & 0xFFF) << 16) | CCM_ANALOG_PLL_ENET_ENET_25M_REF_EN_Pos // PLL Enet2
-	ClockPllUsb2    Clock = ((offPllUsb2 & 0xFFF) << 16) | CCM_ANALOG_PLL_USB2_ENABLE_Pos          // PLL USB2
-)
-
-// PLL PFD name
-const (
-	ClockPfd0 Clock = 0 // PLL PFD0
-	ClockPfd1 Clock = 1 // PLL PFD1
-	ClockPfd2 Clock = 2 // PLL PFD2
-	ClockPfd3 Clock = 3 // PLL PFD3
-)
-
-// Named clock muxes of integrated peripherals
-const (
-	MuxIpPll3Sw     Clock = (offCCSR & 0xFF) | (CCM_CCSR_PLL3_SW_CLK_SEL_Pos << 8) | (((CCM_CCSR_PLL3_SW_CLK_SEL_Msk >> CCM_CCSR_PLL3_SW_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                          // pll3_sw_clk mux name
-	MuxIpPeriph     Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_PERIPH_CLK_SEL_Pos << 8) | (((CCM_CBCDR_PERIPH_CLK_SEL_Msk >> CCM_CBCDR_PERIPH_CLK_SEL_Pos) & 0x1FFF) << 13) | (CCM_CDHIPR_PERIPH_CLK_SEL_BUSY_Pos << 26) // periph mux name
-	MuxIpSemcAlt    Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_SEMC_ALT_CLK_SEL_Pos << 8) | (((CCM_CBCDR_SEMC_ALT_CLK_SEL_Msk >> CCM_CBCDR_SEMC_ALT_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                   // semc mux name
-	MuxIpSemc       Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_SEMC_CLK_SEL_Pos << 8) | (((CCM_CBCDR_SEMC_CLK_SEL_Msk >> CCM_CBCDR_SEMC_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                               // semc mux name
-	MuxIpPrePeriph  Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_PRE_PERIPH_CLK_SEL_Pos << 8) | (((CCM_CBCMR_PRE_PERIPH_CLK_SEL_Msk >> CCM_CBCMR_PRE_PERIPH_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)             // pre-periph mux name
-	MuxIpTrace      Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_TRACE_CLK_SEL_Pos << 8) | (((CCM_CBCMR_TRACE_CLK_SEL_Msk >> CCM_CBCMR_TRACE_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                            // trace mux name
-	MuxIpPeriphClk2 Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_PERIPH_CLK2_SEL_Pos << 8) | (((CCM_CBCMR_PERIPH_CLK2_SEL_Msk >> CCM_CBCMR_PERIPH_CLK2_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                      // periph clock2 mux name
-	MuxIpFlexSpi2   Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_FLEXSPI2_CLK_SEL_Pos << 8) | (((CCM_CBCMR_FLEXSPI2_CLK_SEL_Msk >> CCM_CBCMR_FLEXSPI2_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                   // flexspi2 mux name
-	MuxIpLpspi      Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_LPSPI_CLK_SEL_Pos << 8) | (((CCM_CBCMR_LPSPI_CLK_SEL_Msk >> CCM_CBCMR_LPSPI_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                            // lpspi mux name
-	MuxIpFlexSpi    Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_FLEXSPI_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_FLEXSPI_CLK_SEL_Msk >> CCM_CSCMR1_FLEXSPI_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                  // flexspi mux name
-	MuxIpUsdhc2     Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_USDHC2_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_USDHC2_CLK_SEL_Msk >> CCM_CSCMR1_USDHC2_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                     // usdhc2 mux name
-	MuxIpUsdhc1     Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_USDHC1_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_USDHC1_CLK_SEL_Msk >> CCM_CSCMR1_USDHC1_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                     // usdhc1 mux name
-	MuxIpSai3       Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_SAI3_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_SAI3_CLK_SEL_Msk >> CCM_CSCMR1_SAI3_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                           // sai3 mux name
-	MuxIpSai2       Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_SAI2_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_SAI2_CLK_SEL_Msk >> CCM_CSCMR1_SAI2_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                           // sai2 mux name
-	MuxIpSai1       Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_SAI1_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_SAI1_CLK_SEL_Msk >> CCM_CSCMR1_SAI1_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                           // sai1 mux name
-	MuxIpPerclk     Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_PERCLK_CLK_SEL_Pos << 8) | (((CCM_CSCMR1_PERCLK_CLK_SEL_Msk >> CCM_CSCMR1_PERCLK_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                     // perclk mux name
-	MuxIpFlexio2    Clock = (offCSCMR2 & 0xFF) | (CCM_CSCMR2_FLEXIO2_CLK_SEL_Pos << 8) | (((CCM_CSCMR2_FLEXIO2_CLK_SEL_Msk >> CCM_CSCMR2_FLEXIO2_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                  // flexio2 mux name
-	MuxIpCan        Clock = (offCSCMR2 & 0xFF) | (CCM_CSCMR2_CAN_CLK_SEL_Pos << 8) | (((CCM_CSCMR2_CAN_CLK_SEL_Msk >> CCM_CSCMR2_CAN_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                              // can mux name
-	MuxIpUart       Clock = (offCSCDR1 & 0xFF) | (CCM_CSCDR1_UART_CLK_SEL_Pos << 8) | (((CCM_CSCDR1_UART_CLK_SEL_Msk >> CCM_CSCDR1_UART_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                           // uart mux name
-	MuxIpSpdif      Clock = (offCDCDR & 0xFF) | (CCM_CDCDR_SPDIF0_CLK_SEL_Pos << 8) | (((CCM_CDCDR_SPDIF0_CLK_SEL_Msk >> CCM_CDCDR_SPDIF0_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                         // spdif mux name
-	MuxIpFlexio1    Clock = (offCDCDR & 0xFF) | (CCM_CDCDR_FLEXIO1_CLK_SEL_Pos << 8) | (((CCM_CDCDR_FLEXIO1_CLK_SEL_Msk >> CCM_CDCDR_FLEXIO1_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                      // flexio1 mux name
-	MuxIpLpi2c      Clock = (offCSCDR2 & 0xFF) | (CCM_CSCDR2_LPI2C_CLK_SEL_Pos << 8) | (((CCM_CSCDR2_LPI2C_CLK_SEL_Msk >> CCM_CSCDR2_LPI2C_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                        // lpi2c mux name
-	MuxIpLcdifPre   Clock = (offCSCDR2 & 0xFF) | (CCM_CSCDR2_LCDIF_PRE_CLK_SEL_Pos << 8) | (((CCM_CSCDR2_LCDIF_PRE_CLK_SEL_Msk >> CCM_CSCDR2_LCDIF_PRE_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)            // lcdif pre mux name
-	MuxIpCsi        Clock = (offCSCDR3 & 0xFF) | (CCM_CSCDR3_CSI_CLK_SEL_Pos << 8) | (((CCM_CSCDR3_CSI_CLK_SEL_Msk >> CCM_CSCDR3_CSI_CLK_SEL_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                              // csi mux name
-)
-
-// Named hardware clock divisors of integrated peripherals
-const (
-	DivIpArm        Clock = (offCACRR & 0xFF) | (CCM_CACRR_ARM_PODF_Pos << 8) | (((CCM_CACRR_ARM_PODF_Msk >> CCM_CACRR_ARM_PODF_Pos) & 0x1FFF) << 13) | (CCM_CDHIPR_ARM_PODF_BUSY_Pos << 26)           // core div name
-	DivIpPeriphClk2 Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_PERIPH_CLK2_PODF_Pos << 8) | (((CCM_CBCDR_PERIPH_CLK2_PODF_Msk >> CCM_CBCDR_PERIPH_CLK2_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)     // periph clock2 div name
-	DivIpSemc       Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_SEMC_PODF_Pos << 8) | (((CCM_CBCDR_SEMC_PODF_Msk >> CCM_CBCDR_SEMC_PODF_Pos) & 0x1FFF) << 13) | (CCM_CDHIPR_SEMC_PODF_BUSY_Pos << 26)       // semc div name
-	DivIpAhb        Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_AHB_PODF_Pos << 8) | (((CCM_CBCDR_AHB_PODF_Msk >> CCM_CBCDR_AHB_PODF_Pos) & 0x1FFF) << 13) | (CCM_CDHIPR_AHB_PODF_BUSY_Pos << 26)           // ahb div name
-	DivIpIpg        Clock = (offCBCDR & 0xFF) | (CCM_CBCDR_IPG_PODF_Pos << 8) | (((CCM_CBCDR_IPG_PODF_Msk >> CCM_CBCDR_IPG_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                             // ipg div name
-	DivIpFlexSpi2   Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_FLEXSPI2_PODF_Pos << 8) | (((CCM_CBCMR_FLEXSPI2_PODF_Msk >> CCM_CBCMR_FLEXSPI2_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)              // flexspi2 div name
-	DivIpLpspi      Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_LPSPI_PODF_Pos << 8) | (((CCM_CBCMR_LPSPI_PODF_Msk >> CCM_CBCMR_LPSPI_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                       // lpspi div name
-	DivIpLcdif      Clock = (offCBCMR & 0xFF) | (CCM_CBCMR_LCDIF_PODF_Pos << 8) | (((CCM_CBCMR_LCDIF_PODF_Msk >> CCM_CBCMR_LCDIF_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                       // lcdif div name
-	DivIpFlexSpi    Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_FLEXSPI_PODF_Pos << 8) | (((CCM_CSCMR1_FLEXSPI_PODF_Msk >> CCM_CSCMR1_FLEXSPI_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)             // flexspi div name
-	DivIpPerclk     Clock = (offCSCMR1 & 0xFF) | (CCM_CSCMR1_PERCLK_PODF_Pos << 8) | (((CCM_CSCMR1_PERCLK_PODF_Msk >> CCM_CSCMR1_PERCLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                // perclk div name
-	DivIpCan        Clock = (offCSCMR2 & 0xFF) | (CCM_CSCMR2_CAN_CLK_PODF_Pos << 8) | (((CCM_CSCMR2_CAN_CLK_PODF_Msk >> CCM_CSCMR2_CAN_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)             // can div name
-	DivIpTrace      Clock = (offCSCDR1 & 0xFF) | (CCM_CSCDR1_TRACE_PODF_Pos << 8) | (((CCM_CSCDR1_TRACE_PODF_Msk >> CCM_CSCDR1_TRACE_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                   // trace div name
-	DivIpUsdhc2     Clock = (offCSCDR1 & 0xFF) | (CCM_CSCDR1_USDHC2_PODF_Pos << 8) | (((CCM_CSCDR1_USDHC2_PODF_Msk >> CCM_CSCDR1_USDHC2_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                // usdhc2 div name
-	DivIpUsdhc1     Clock = (offCSCDR1 & 0xFF) | (CCM_CSCDR1_USDHC1_PODF_Pos << 8) | (((CCM_CSCDR1_USDHC1_PODF_Msk >> CCM_CSCDR1_USDHC1_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                // usdhc1 div name
-	DivIpUart       Clock = (offCSCDR1 & 0xFF) | (CCM_CSCDR1_UART_CLK_PODF_Pos << 8) | (((CCM_CSCDR1_UART_CLK_PODF_Msk >> CCM_CSCDR1_UART_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // uart div name
-	DivIpFlexio2    Clock = (offCS1CDR & 0xFF) | (CCM_CS1CDR_FLEXIO2_CLK_PODF_Pos << 8) | (((CCM_CS1CDR_FLEXIO2_CLK_PODF_Msk >> CCM_CS1CDR_FLEXIO2_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26) // flexio2 pre div name
-	DivIpSai3Pre    Clock = (offCS1CDR & 0xFF) | (CCM_CS1CDR_SAI3_CLK_PRED_Pos << 8) | (((CCM_CS1CDR_SAI3_CLK_PRED_Msk >> CCM_CS1CDR_SAI3_CLK_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // sai3 pre div name
-	DivIpSai3       Clock = (offCS1CDR & 0xFF) | (CCM_CS1CDR_SAI3_CLK_PODF_Pos << 8) | (((CCM_CS1CDR_SAI3_CLK_PODF_Msk >> CCM_CS1CDR_SAI3_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // sai3 div name
-	DivIpFlexio2Pre Clock = (offCS1CDR & 0xFF) | (CCM_CS1CDR_FLEXIO2_CLK_PRED_Pos << 8) | (((CCM_CS1CDR_FLEXIO2_CLK_PRED_Msk >> CCM_CS1CDR_FLEXIO2_CLK_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26) // sai3 pre div name
-	DivIpSai1Pre    Clock = (offCS1CDR & 0xFF) | (CCM_CS1CDR_SAI1_CLK_PRED_Pos << 8) | (((CCM_CS1CDR_SAI1_CLK_PRED_Msk >> CCM_CS1CDR_SAI1_CLK_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // sai1 pre div name
-	DivIpSai1       Clock = (offCS1CDR & 0xFF) | (CCM_CS1CDR_SAI1_CLK_PODF_Pos << 8) | (((CCM_CS1CDR_SAI1_CLK_PODF_Msk >> CCM_CS1CDR_SAI1_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // sai1 div name
-	DivIpSai2Pre    Clock = (offCS2CDR & 0xFF) | (CCM_CS2CDR_SAI2_CLK_PRED_Pos << 8) | (((CCM_CS2CDR_SAI2_CLK_PRED_Msk >> CCM_CS2CDR_SAI2_CLK_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // sai2 pre div name
-	DivIpSai2       Clock = (offCS2CDR & 0xFF) | (CCM_CS2CDR_SAI2_CLK_PODF_Pos << 8) | (((CCM_CS2CDR_SAI2_CLK_PODF_Msk >> CCM_CS2CDR_SAI2_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)          // sai2 div name
-	DivIpSpdif0Pre  Clock = (offCDCDR & 0xFF) | (CCM_CDCDR_SPDIF0_CLK_PRED_Pos << 8) | (((CCM_CDCDR_SPDIF0_CLK_PRED_Msk >> CCM_CDCDR_SPDIF0_CLK_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)        // spdif pre div name
-	DivIpSpdif0     Clock = (offCDCDR & 0xFF) | (CCM_CDCDR_SPDIF0_CLK_PODF_Pos << 8) | (((CCM_CDCDR_SPDIF0_CLK_PODF_Msk >> CCM_CDCDR_SPDIF0_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)        // spdif div name
-	DivIpFlexio1Pre Clock = (offCDCDR & 0xFF) | (CCM_CDCDR_FLEXIO1_CLK_PRED_Pos << 8) | (((CCM_CDCDR_FLEXIO1_CLK_PRED_Msk >> CCM_CDCDR_FLEXIO1_CLK_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)     // flexio1 pre div name
-	DivIpFlexio1    Clock = (offCDCDR & 0xFF) | (CCM_CDCDR_FLEXIO1_CLK_PODF_Pos << 8) | (((CCM_CDCDR_FLEXIO1_CLK_PODF_Msk >> CCM_CDCDR_FLEXIO1_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)     // flexio1 div name
-	DivIpLpi2c      Clock = (offCSCDR2 & 0xFF) | (CCM_CSCDR2_LPI2C_CLK_PODF_Pos << 8) | (((CCM_CSCDR2_LPI2C_CLK_PODF_Msk >> CCM_CSCDR2_LPI2C_CLK_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)       // lpi2c div name
-	DivIpLcdifPre   Clock = (offCSCDR2 & 0xFF) | (CCM_CSCDR2_LCDIF_PRED_Pos << 8) | (((CCM_CSCDR2_LCDIF_PRED_Msk >> CCM_CSCDR2_LCDIF_PRED_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                   // lcdif pre div name
-	DivIpCsi        Clock = (offCSCDR3 & 0xFF) | (CCM_CSCDR3_CSI_PODF_Pos << 8) | (((CCM_CSCDR3_CSI_PODF_Msk >> CCM_CSCDR3_CSI_PODF_Pos) & 0x1FFF) << 13) | (noBusyWait << 26)                         // csi div name
-)
-
-// Selected clock offsets
-const (
-	offCCSR   = 0x0C
-	offCBCDR  = 0x14
-	offCBCMR  = 0x18
-	offCSCMR1 = 0x1C
-	offCSCMR2 = 0x20
-	offCSCDR1 = 0x24
-	offCDCDR  = 0x30
-	offCSCDR2 = 0x38
-	offCSCDR3 = 0x3C
-	offCACRR  = 0x10
-	offCS1CDR = 0x28
-	offCS2CDR = 0x2C
-
-	offPllArm   = 0x00
-	offPllSys   = 0x30
-	offPllUsb1  = 0x10
-	offPllAudio = 0x70
-	offPllVideo = 0xA0
-	offPllEnet  = 0xE0
-	offPllUsb2  = 0x20
-
-	noBusyWait = 0x20
-)
-
-// analog PLL definition
-const (
-	pllBypassPos       = 16
-	pllBypassClkSrcMsk = 0xC000
-	pllBypassClkSrcPos = 14
-)
-
-// PLL clock source, bypass cloco source also
-const (
-	pllSrc24M   = 0 // Pll clock source 24M
-	pllSrcClkPN = 1 // Pll clock source CLK1_P and CLK1_N
-)
-
-const (
-	clockNotNeeded     uint32 = 0 // Clock is off during all modes
-	clockNeededRun     uint32 = 1 // Clock is on in run mode, but off in WAIT and STOP modes
-	clockNeededRunWait uint32 = 3 // Clock is on during all modes, except STOP mode
-)
-
-// getGate returns the CCM clock gating register for the receiver clk.
-func (clk Clock) getGate() *volatile.Register32 {
-	switch clk >> 8 {
-	case 0:
-		return &CCM.CCGR0
-	case 1:
-		return &CCM.CCGR1
-	case 2:
-		return &CCM.CCGR2
-	case 3:
-		return &CCM.CCGR3
-	case 4:
-		return &CCM.CCGR4
-	case 5:
-		return &CCM.CCGR5
-	case 6:
-		return &CCM.CCGR6
-	case 7:
-		return &CCM.CCGR7
-	default:
-		panic("nxp: invalid clock")
-	}
-}
-
-// setGate enables or disables the receiver clk using its gating register.
-func (clk Clock) setGate(value uint32) {
-	reg := clk.getGate()
-	shift := clk & 0x1F
-	reg.Set((reg.Get() & ^(3 << shift)) | (value << shift))
-}
-
-func (clk Clock) setCcm(value uint32) {
-	const ccmBase = 0x400fc000
-	reg := (*volatile.Register32)(unsafe.Pointer(uintptr(ccmBase + (uint32(clk) & 0xFF))))
-	msk := ((uint32(clk) >> 13) & 0x1FFF) << ((uint32(clk) >> 8) & 0x1F)
-	pos := (uint32(clk) >> 8) & 0x1F
-	bsy := (uint32(clk) >> 26) & 0x3F
-	reg.Set((reg.Get() & ^uint32(msk)) | ((value << pos) & msk))
-	if bsy < noBusyWait {
-		for CCM.CDHIPR.HasBits(1 << bsy) {
-		}
-	}
-}
-
-func setSysPfd(value ...uint32) {
-	for i, val := range value {
-		pfd528 := CCM_ANALOG.PFD_528.Get() &
-			^((CCM_ANALOG_PFD_528_PFD0_CLKGATE_Msk | CCM_ANALOG_PFD_528_PFD0_FRAC_Msk) << (8 * uint32(i)))
-		frac := (val << CCM_ANALOG_PFD_528_PFD0_FRAC_Pos) & CCM_ANALOG_PFD_528_PFD0_FRAC_Msk
-		// disable the clock output first
-		CCM_ANALOG.PFD_528.Set(pfd528 | (CCM_ANALOG_PFD_528_PFD0_CLKGATE_Msk << (8 * uint32(i))))
-		// set the new value and enable output
-		CCM_ANALOG.PFD_528.Set(pfd528 | (frac << (8 * uint32(i))))
-	}
-}
-
-func setUsb1Pfd(value ...uint32) {
-	for i, val := range value {
-		pfd480 := CCM_ANALOG.PFD_480.Get() &
-			^((CCM_ANALOG_PFD_480_PFD0_CLKGATE_Msk | CCM_ANALOG_PFD_480_PFD0_FRAC_Msk) << (8 * uint32(i)))
-		frac := (val << CCM_ANALOG_PFD_480_PFD0_FRAC_Pos) & CCM_ANALOG_PFD_480_PFD0_FRAC_Msk
-		// disable the clock output first
-		CCM_ANALOG.PFD_480.Set(pfd480 | (CCM_ANALOG_PFD_480_PFD0_CLKGATE_Msk << (8 * uint32(i))))
-		// set the new value and enable output
-		CCM_ANALOG.PFD_480.Set(pfd480 | (frac << (8 * uint32(i))))
-	}
-}
-
-// PLL configuration for ARM
-type ClockConfigArmPll struct {
-	LoopDivider uint32 // PLL loop divider. Valid range for divider value: 54-108. Fout=Fin*LoopDivider/2.
-	Src         uint8  // Pll clock source, reference _clock_pll_clk_src
-}
-
-func (cfg ClockConfigArmPll) Configure() {
-
-	// bypass PLL first
-	src := (uint32(cfg.Src) << CCM_ANALOG_PLL_ARM_BYPASS_CLK_SRC_Pos) & CCM_ANALOG_PLL_ARM_BYPASS_CLK_SRC_Msk
-	CCM_ANALOG.PLL_ARM.Set(
-		(CCM_ANALOG.PLL_ARM.Get() & ^uint32(CCM_ANALOG_PLL_ARM_BYPASS_CLK_SRC_Msk)) |
-			CCM_ANALOG_PLL_ARM_BYPASS_Msk | src)
-
-	sel := (cfg.LoopDivider << CCM_ANALOG_PLL_ARM_DIV_SELECT_Pos) & CCM_ANALOG_PLL_ARM_DIV_SELECT_Msk
-	CCM_ANALOG.PLL_ARM.Set(
-		(CCM_ANALOG.PLL_ARM.Get() & ^uint32(CCM_ANALOG_PLL_ARM_DIV_SELECT_Msk|CCM_ANALOG_PLL_ARM_POWERDOWN_Msk)) |
-			CCM_ANALOG_PLL_ARM_ENABLE_Msk | sel)
-
-	for !CCM_ANALOG.PLL_ARM.HasBits(CCM_ANALOG_PLL_ARM_LOCK_Msk) {
-	}
-
-	// disable bypass
-	CCM_ANALOG.PLL_ARM.ClearBits(CCM_ANALOG_PLL_ARM_BYPASS_Msk)
-}
-
-// PLL configuration for System
-type ClockConfigSysPll struct {
-	LoopDivider uint8  // PLL loop divider. Intended to be 1 (528M): 0 - Fout=Fref*20, 1 - Fout=Fref*22
-	Numerator   uint32 // 30 bit Numerator of fractional loop divider.
-	Denominator uint32 // 30 bit Denominator of fractional loop divider
-	Src         uint8  // Pll clock source, reference _clock_pll_clk_src
-	SsStop      uint16 // Stop value to get frequency change.
-	SsEnable    uint8  // Enable spread spectrum modulation
-	SsStep      uint16 // Step value to get frequency change step.
-}
-
-func (cfg ClockConfigSysPll) Configure(pfd ...uint32) {
-
-	// bypass PLL first
-	src := (uint32(cfg.Src) << CCM_ANALOG_PLL_SYS_BYPASS_CLK_SRC_Pos) & CCM_ANALOG_PLL_SYS_BYPASS_CLK_SRC_Msk
-	CCM_ANALOG.PLL_SYS.Set(
-		(CCM_ANALOG.PLL_SYS.Get() & ^uint32(CCM_ANALOG_PLL_SYS_BYPASS_CLK_SRC_Msk)) |
-			CCM_ANALOG_PLL_SYS_BYPASS_Msk | src)
-
-	sel := (uint32(cfg.LoopDivider) << CCM_ANALOG_PLL_SYS_DIV_SELECT_Pos) & CCM_ANALOG_PLL_SYS_DIV_SELECT_Msk
-	CCM_ANALOG.PLL_SYS.Set(
-		(CCM_ANALOG.PLL_SYS.Get() & ^uint32(CCM_ANALOG_PLL_SYS_DIV_SELECT_Msk|CCM_ANALOG_PLL_SYS_POWERDOWN_Msk)) |
-			CCM_ANALOG_PLL_SYS_ENABLE_Msk | sel)
-
-	// initialize the fractional mode
-	CCM_ANALOG.PLL_SYS_NUM.Set((cfg.Numerator << CCM_ANALOG_PLL_SYS_NUM_A_Pos) & CCM_ANALOG_PLL_SYS_NUM_A_Msk)
-	CCM_ANALOG.PLL_SYS_DENOM.Set((cfg.Denominator << CCM_ANALOG_PLL_SYS_DENOM_B_Pos) & CCM_ANALOG_PLL_SYS_DENOM_B_Msk)
-
-	// initialize the spread spectrum mode
-	inc := (uint32(cfg.SsStep) << CCM_ANALOG_PLL_SYS_SS_STEP_Pos) & CCM_ANALOG_PLL_SYS_SS_STEP_Msk
-	enb := (uint32(cfg.SsEnable) << CCM_ANALOG_PLL_SYS_SS_ENABLE_Pos) & CCM_ANALOG_PLL_SYS_SS_ENABLE_Msk
-	stp := (uint32(cfg.SsStop) << CCM_ANALOG_PLL_SYS_SS_STOP_Pos) & CCM_ANALOG_PLL_SYS_SS_STOP_Msk
-	CCM_ANALOG.PLL_SYS_SS.Set(inc | enb | stp)
-
-	for !CCM_ANALOG.PLL_SYS.HasBits(CCM_ANALOG_PLL_SYS_LOCK_Msk) {
-	}
-
-	// disable bypass
-	CCM_ANALOG.PLL_SYS.ClearBits(CCM_ANALOG_PLL_SYS_BYPASS_Msk)
-
-	// update PFDs after update
-	setSysPfd(pfd...)
-}
-
-// PLL configuration for USB
-type ClockConfigUsbPll struct {
-	Instance    uint8 // USB PLL number (1 or 2)
-	LoopDivider uint8 // PLL loop divider: 0 - Fout=Fref*20, 1 - Fout=Fref*22
-	Src         uint8 // Pll clock source, reference _clock_pll_clk_src
-}
-
-func (cfg ClockConfigUsbPll) Configure(pfd ...uint32) {
-
-	switch cfg.Instance {
-	case 1:
-
-		// bypass PLL first
-		src := (uint32(cfg.Src) << CCM_ANALOG_PLL_USB1_BYPASS_CLK_SRC_Pos) & CCM_ANALOG_PLL_USB1_BYPASS_CLK_SRC_Msk
-		CCM_ANALOG.PLL_USB1.Set(
-			(CCM_ANALOG.PLL_USB1.Get() & ^uint32(CCM_ANALOG_PLL_USB1_BYPASS_CLK_SRC_Msk)) |
-				CCM_ANALOG_PLL_USB1_BYPASS_Msk | src)
-
-		sel := uint32((cfg.LoopDivider << CCM_ANALOG_PLL_USB1_DIV_SELECT_Pos) & CCM_ANALOG_PLL_USB1_DIV_SELECT_Msk)
-		CCM_ANALOG.PLL_USB1_SET.Set(
-			(CCM_ANALOG.PLL_USB1.Get() & ^uint32(CCM_ANALOG_PLL_USB1_DIV_SELECT_Msk)) |
-				CCM_ANALOG_PLL_USB1_ENABLE_Msk | CCM_ANALOG_PLL_USB1_POWER_Msk |
-				CCM_ANALOG_PLL_USB1_EN_USB_CLKS_Msk | sel)
-
-		for !CCM_ANALOG.PLL_USB1.HasBits(CCM_ANALOG_PLL_USB1_LOCK_Msk) {
-		}
-
-		// disable bypass
-		CCM_ANALOG.PLL_USB1_CLR.Set(CCM_ANALOG_PLL_USB1_BYPASS_Msk)
-
-		// update PFDs after update
-		setUsb1Pfd(pfd...)
-
-	case 2:
-		// bypass PLL first
-		src := (uint32(cfg.Src) << CCM_ANALOG_PLL_USB2_BYPASS_CLK_SRC_Pos) & CCM_ANALOG_PLL_USB2_BYPASS_CLK_SRC_Msk
-		CCM_ANALOG.PLL_USB2.Set(
-			(CCM_ANALOG.PLL_USB2.Get() & ^uint32(CCM_ANALOG_PLL_USB2_BYPASS_CLK_SRC_Msk)) |
-				CCM_ANALOG_PLL_USB2_BYPASS_Msk | src)
-
-		sel := uint32((cfg.LoopDivider << CCM_ANALOG_PLL_USB2_DIV_SELECT_Pos) & CCM_ANALOG_PLL_USB2_DIV_SELECT_Msk)
-		CCM_ANALOG.PLL_USB2.Set(
-			(CCM_ANALOG.PLL_USB2.Get() & ^uint32(CCM_ANALOG_PLL_USB2_DIV_SELECT_Msk)) |
-				CCM_ANALOG_PLL_USB2_ENABLE_Msk | CCM_ANALOG_PLL_USB2_POWER_Msk |
-				CCM_ANALOG_PLL_USB2_EN_USB_CLKS_Msk | sel)
-
-		for !CCM_ANALOG.PLL_USB2.HasBits(CCM_ANALOG_PLL_USB2_LOCK_Msk) {
-		}
-
-		// disable bypass
-		CCM_ANALOG.PLL_USB2.ClearBits(CCM_ANALOG_PLL_USB2_BYPASS_Msk)
-
-	default:
-		panic("nxp: invalid USB PLL")
-	}
-}
@@ -1,29 +0,0 @@
-// Hand created file. DO NOT DELETE.
-// Hardfault aliases for definitions that have inconsistent naming (which are
-// auto-generated by gen-device-svd.go) among devices in package nxp.
-
-// +build nxp,mimxrt1062
-
-package nxp
-
-const (
-	HardFault_CFSR_IACCVIOL    = SCB_CFSR_IACCVIOL
-	HardFault_CFSR_DACCVIOL    = SCB_CFSR_DACCVIOL
-	HardFault_CFSR_MUNSTKERR   = SCB_CFSR_MUNSTKERR
-	HardFault_CFSR_MSTKERR     = SCB_CFSR_MSTKERR
-	HardFault_CFSR_MLSPERR     = SCB_CFSR_MLSPERR
-	HardFault_CFSR_IBUSERR     = SCB_CFSR_IBUSERR
-	HardFault_CFSR_PRECISERR   = SCB_CFSR_PRECISERR
-	HardFault_CFSR_IMPRECISERR = SCB_CFSR_IMPRECISERR
-	HardFault_CFSR_UNSTKERR    = SCB_CFSR_UNSTKERR
-	HardFault_CFSR_STKERR      = SCB_CFSR_STKERR
-	HardFault_CFSR_LSPERR      = SCB_CFSR_LSPERR
-	HardFault_CFSR_UNDEFINSTR  = SCB_CFSR_UNDEFINSTR
-	HardFault_CFSR_INVSTATE    = SCB_CFSR_INVSTATE
-	HardFault_CFSR_INVPC       = SCB_CFSR_INVPC
-	HardFault_CFSR_NOCP        = SCB_CFSR_NOCP
-	HardFault_CFSR_UNALIGNED   = SCB_CFSR_UNALIGNED
-	HardFault_CFSR_DIVBYZERO   = SCB_CFSR_DIVBYZERO
-	HardFault_CFSR_MMARVALID   = SCB_CFSR_MMARVALID
-	HardFault_CFSR_BFARVALID   = SCB_CFSR_BFARVALID
-)
@@ -1,278 +0,0 @@
-// Hand created file. DO NOT DELETE.
-// Type definitions, fields, and constants associated with the MPU peripheral
-// of the NXP MIMXRT1062.
-
-// +build nxp,mimxrt1062
-
-package nxp
-
-import (
-	"device/arm"
-	"runtime/volatile"
-	"unsafe"
-)
-
-type MPU_Type struct {
-	TYPE    volatile.Register32 // 0x000 (R/ ) - MPU Type Register
-	CTRL    volatile.Register32 // 0x004 (R/W) - MPU Control Register
-	RNR     volatile.Register32 // 0x008 (R/W) - MPU Region RNRber Register
-	RBAR    volatile.Register32 // 0x00C (R/W) - MPU Region Base Address Register
-	RASR    volatile.Register32 // 0x010 (R/W) - MPU Region Attribute and Size Register
-	RBAR_A1 volatile.Register32 // 0x014 (R/W) - MPU Alias 1 Region Base Address Register
-	RASR_A1 volatile.Register32 // 0x018 (R/W) - MPU Alias 1 Region Attribute and Size Register
-	RBAR_A2 volatile.Register32 // 0x01C (R/W) - MPU Alias 2 Region Base Address Register
-	RASR_A2 volatile.Register32 // 0x020 (R/W) - MPU Alias 2 Region Attribute and Size Register
-	RBAR_A3 volatile.Register32 // 0x024 (R/W) - MPU Alias 3 Region Base Address Register
-	RASR_A3 volatile.Register32 // 0x028 (R/W) - MPU Alias 3 Region Attribute and Size Register
-}
-
-var MPU = (*MPU_Type)(unsafe.Pointer(uintptr(0xe000ed90)))
-
-type (
-	RegionSize  uint32
-	AccessPerms uint32
-	Extension   uint32
-)
-
-// MPU Control Register Definitions
-const (
-	MPU_CTRL_PRIVDEFENA_Pos = 2                            // MPU CTRL: PRIVDEFENA Position
-	MPU_CTRL_PRIVDEFENA_Msk = 1 << MPU_CTRL_PRIVDEFENA_Pos // MPU CTRL: PRIVDEFENA Mask
-	MPU_CTRL_HFNMIENA_Pos   = 1                            // MPU CTRL: HFNMIENA Position
-	MPU_CTRL_HFNMIENA_Msk   = 1 << MPU_CTRL_HFNMIENA_Pos   // MPU CTRL: HFNMIENA Mask
-	MPU_CTRL_ENABLE_Pos     = 0                            // MPU CTRL: ENABLE Position
-	MPU_CTRL_ENABLE_Msk     = 1                            // MPU CTRL: ENABLE Mask
-)
-
-// MPU Region Base Address Register Definitions
-const (
-	MPU_RBAR_ADDR_Pos   = 5                              // MPU RBAR: ADDR Position
-	MPU_RBAR_ADDR_Msk   = 0x7FFFFFF << MPU_RBAR_ADDR_Pos // MPU RBAR: ADDR Mask
-	MPU_RBAR_VALID_Pos  = 4                              // MPU RBAR: VALID Position
-	MPU_RBAR_VALID_Msk  = 1 << MPU_RBAR_VALID_Pos        // MPU RBAR: VALID Mask
-	MPU_RBAR_REGION_Pos = 0                              // MPU RBAR: REGION Position
-	MPU_RBAR_REGION_Msk = 0xF                            // MPU RBAR: REGION Mask
-)
-
-// MPU Region Attribute and Size Register Definitions
-const (
-	MPU_RASR_ATTRS_Pos  = 16                           // MPU RASR: MPU Region Attribute field Position
-	MPU_RASR_ATTRS_Msk  = 0xFFFF << MPU_RASR_ATTRS_Pos // MPU RASR: MPU Region Attribute field Mask
-	MPU_RASR_XN_Pos     = 28                           // MPU RASR: ATTRS.XN Position
-	MPU_RASR_XN_Msk     = 1 << MPU_RASR_XN_Pos         // MPU RASR: ATTRS.XN Mask
-	MPU_RASR_AP_Pos     = 24                           // MPU RASR: ATTRS.AP Position
-	MPU_RASR_AP_Msk     = 0x7 << MPU_RASR_AP_Pos       // MPU RASR: ATTRS.AP Mask
-	MPU_RASR_TEX_Pos    = 19                           // MPU RASR: ATTRS.TEX Position
-	MPU_RASR_TEX_Msk    = 0x7 << MPU_RASR_TEX_Pos      // MPU RASR: ATTRS.TEX Mask
-	MPU_RASR_S_Pos      = 18                           // MPU RASR: ATTRS.S Position
-	MPU_RASR_S_Msk      = 1 << MPU_RASR_S_Pos          // MPU RASR: ATTRS.S Mask
-	MPU_RASR_C_Pos      = 17                           // MPU RASR: ATTRS.C Position
-	MPU_RASR_C_Msk      = 1 << MPU_RASR_C_Pos          // MPU RASR: ATTRS.C Mask
-	MPU_RASR_B_Pos      = 16                           // MPU RASR: ATTRS.B Position
-	MPU_RASR_B_Msk      = 1 << MPU_RASR_B_Pos          // MPU RASR: ATTRS.B Mask
-	MPU_RASR_SRD_Pos    = 8                            // MPU RASR: Sub-Region Disable Position
-	MPU_RASR_SRD_Msk    = 0xFF << MPU_RASR_SRD_Pos     // MPU RASR: Sub-Region Disable Mask
-	MPU_RASR_SIZE_Pos   = 1                            // MPU RASR: Region Size Field Position
-	MPU_RASR_SIZE_Msk   = 0x1F << MPU_RASR_SIZE_Pos    // MPU RASR: Region Size Field Mask
-	MPU_RASR_ENABLE_Pos = 0                            // MPU RASR: Region enable bit Position
-	MPU_RASR_ENABLE_Msk = 1                            // MPU RASR: Region enable bit Disable Mask
-)
-
-const (
-	SCB_DCISW_WAY_Pos = 30                         // SCB DCISW: Way Position
-	SCB_DCISW_WAY_Msk = 3 << SCB_DCISW_WAY_Pos     // SCB DCISW: Way Mask
-	SCB_DCISW_SET_Pos = 5                          // SCB DCISW: Set Position
-	SCB_DCISW_SET_Msk = 0x1FF << SCB_DCISW_SET_Pos // SCB DCISW: Set Mask
-)
-
-const (
-	SCB_DCCISW_WAY_Pos = 30                          // SCB DCCISW: Way Position
-	SCB_DCCISW_WAY_Msk = 3 << SCB_DCCISW_WAY_Pos     // SCB DCCISW: Way Mask
-	SCB_DCCISW_SET_Pos = 5                           // SCB DCCISW: Set Position
-	SCB_DCCISW_SET_Msk = 0x1FF << SCB_DCCISW_SET_Pos // SCB DCCISW: Set Mask
-)
-
-const (
-	RGNSZ_32B   RegionSize = 0x04 // MPU Region Size 32 Bytes
-	RGNSZ_64B   RegionSize = 0x05 // MPU Region Size 64 Bytes
-	RGNSZ_128B  RegionSize = 0x06 // MPU Region Size 128 Bytes
-	RGNSZ_256B  RegionSize = 0x07 // MPU Region Size 256 Bytes
-	RGNSZ_512B  RegionSize = 0x08 // MPU Region Size 512 Bytes
-	RGNSZ_1KB   RegionSize = 0x09 // MPU Region Size 1 KByte
-	RGNSZ_2KB   RegionSize = 0x0A // MPU Region Size 2 KBytes
-	RGNSZ_4KB   RegionSize = 0x0B // MPU Region Size 4 KBytes
-	RGNSZ_8KB   RegionSize = 0x0C // MPU Region Size 8 KBytes
-	RGNSZ_16KB  RegionSize = 0x0D // MPU Region Size 16 KBytes
-	RGNSZ_32KB  RegionSize = 0x0E // MPU Region Size 32 KBytes
-	RGNSZ_64KB  RegionSize = 0x0F // MPU Region Size 64 KBytes
-	RGNSZ_128KB RegionSize = 0x10 // MPU Region Size 128 KBytes
-	RGNSZ_256KB RegionSize = 0x11 // MPU Region Size 256 KBytes
-	RGNSZ_512KB RegionSize = 0x12 // MPU Region Size 512 KBytes
-	RGNSZ_1MB   RegionSize = 0x13 // MPU Region Size 1 MByte
-	RGNSZ_2MB   RegionSize = 0x14 // MPU Region Size 2 MBytes
-	RGNSZ_4MB   RegionSize = 0x15 // MPU Region Size 4 MBytes
-	RGNSZ_8MB   RegionSize = 0x16 // MPU Region Size 8 MBytes
-	RGNSZ_16MB  RegionSize = 0x17 // MPU Region Size 16 MBytes
-	RGNSZ_32MB  RegionSize = 0x18 // MPU Region Size 32 MBytes
-	RGNSZ_64MB  RegionSize = 0x19 // MPU Region Size 64 MBytes
-	RGNSZ_128MB RegionSize = 0x1A // MPU Region Size 128 MBytes
-	RGNSZ_256MB RegionSize = 0x1B // MPU Region Size 256 MBytes
-	RGNSZ_512MB RegionSize = 0x1C // MPU Region Size 512 MBytes
-	RGNSZ_1GB   RegionSize = 0x1D // MPU Region Size 1 GByte
-	RGNSZ_2GB   RegionSize = 0x1E // MPU Region Size 2 GBytes
-	RGNSZ_4GB   RegionSize = 0x1F // MPU Region Size 4 GBytes
-)
-
-const (
-	PERM_NONE AccessPerms = 0 // MPU Access Permission no access
-	PERM_PRIV AccessPerms = 1 // MPU Access Permission privileged access only
-	PERM_URO  AccessPerms = 2 // MPU Access Permission unprivileged access read-only
-	PERM_FULL AccessPerms = 3 // MPU Access Permission full access
-	PERM_PRO  AccessPerms = 5 // MPU Access Permission privileged access read-only
-	PERM_RO   AccessPerms = 6 // MPU Access Permission read-only access
-)
-
-const (
-	EXTN_NORMAL Extension = 0
-	EXTN_DEVICE Extension = 2
-)
-
-func (mpu *MPU_Type) Enable(enable bool) {
-	if enable {
-		mpu.CTRL.Set(MPU_CTRL_PRIVDEFENA_Msk | MPU_CTRL_ENABLE_Msk)
-		SystemControl.SHCSR.SetBits(SCB_SHCSR_MEMFAULTENA_Msk)
-		arm.AsmFull(`
-      dsb 0xF
-      isb 0xF
-    `, nil)
-		enableDcache(true)
-		enableIcache(true)
-	} else {
-		enableIcache(false)
-		enableDcache(false)
-		arm.AsmFull(`
-      dmb 0xF
-    `, nil)
-		SystemControl.SHCSR.ClearBits(SCB_SHCSR_MEMFAULTENA_Msk)
-		mpu.CTRL.ClearBits(MPU_CTRL_ENABLE_Msk)
-	}
-}
-
-// MPU Region Base Address Register value
-func (mpu *MPU_Type) SetRBAR(region uint32, baseAddress uint32) {
-	mpu.RBAR.Set((baseAddress & MPU_RBAR_ADDR_Msk) |
-		(region & MPU_RBAR_REGION_Msk) | MPU_RBAR_VALID_Msk)
-}
-
-// MPU Region Attribute and Size Register value
-func (mpu *MPU_Type) SetRASR(size RegionSize, access AccessPerms, ext Extension, exec, share, cache, buffer, disable bool) {
-	boolBit := func(b bool) uint32 {
-		if b {
-			return 1
-		}
-		return 0
-	}
-	attr := ((uint32(ext) << MPU_RASR_TEX_Pos) & MPU_RASR_TEX_Msk) |
-		((boolBit(share) << MPU_RASR_S_Pos) & MPU_RASR_S_Msk) |
-		((boolBit(cache) << MPU_RASR_C_Pos) & MPU_RASR_C_Msk) |
-		((boolBit(buffer) << MPU_RASR_B_Pos) & MPU_RASR_B_Msk)
-	mpu.RASR.Set(((boolBit(!exec) << MPU_RASR_XN_Pos) & MPU_RASR_XN_Msk) |
-		((uint32(access) << MPU_RASR_AP_Pos) & MPU_RASR_AP_Msk) |
-		(attr & (MPU_RASR_TEX_Msk | MPU_RASR_S_Msk | MPU_RASR_C_Msk | MPU_RASR_B_Msk)) |
-		((boolBit(disable) << MPU_RASR_SRD_Pos) & MPU_RASR_SRD_Msk) |
-		((uint32(size) << MPU_RASR_SIZE_Pos) & MPU_RASR_SIZE_Msk) |
-		MPU_RASR_ENABLE_Msk)
-}
-
-func enableIcache(enable bool) {
-	if enable != SystemControl.CCR.HasBits(SCB_CCR_IC_Msk) {
-		if enable {
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-			SystemControl.ICIALLU.Set(0)
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-			SystemControl.CCR.SetBits(SCB_CCR_IC_Msk)
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-		} else {
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-			SystemControl.CCR.ClearBits(SCB_CCR_IC_Msk)
-			SystemControl.ICIALLU.Set(0)
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-		}
-	}
-}
-
-func enableDcache(enable bool) {
-	if enable != SystemControl.CCR.HasBits(SCB_CCR_DC_Msk) {
-		if enable {
-			SystemControl.CSSELR.Set(0)
-			arm.AsmFull(`
-        dsb 0xF
-      `, nil)
-			ccsidr := SystemControl.CCSIDR.Get()
-			sets := (ccsidr & SCB_CCSIDR_NUMSETS_Msk) >> SCB_CCSIDR_NUMSETS_Pos
-			for sets != 0 {
-				ways := (ccsidr & SCB_CCSIDR_ASSOCIATIVITY_Msk) >> SCB_CCSIDR_ASSOCIATIVITY_Pos
-				for ways != 0 {
-					SystemControl.DCISW.Set(
-						((sets << SCB_DCISW_SET_Pos) & SCB_DCISW_SET_Msk) |
-							((ways << SCB_DCISW_WAY_Pos) & SCB_DCISW_WAY_Msk))
-					ways--
-				}
-				sets--
-			}
-			arm.AsmFull(`
-        dsb 0xF
-      `, nil)
-			SystemControl.CCR.SetBits(SCB_CCR_DC_Msk)
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-		} else {
-			var (
-				ccsidr volatile.Register32
-				sets   volatile.Register32
-				ways   volatile.Register32
-			)
-			SystemControl.CSSELR.Set(0)
-			arm.AsmFull(`
-        dsb 0xF
-      `, nil)
-			SystemControl.CCR.ClearBits(SCB_CCR_DC_Msk)
-			arm.AsmFull(`
-        dsb 0xF
-      `, nil)
-			ccsidr.Set(SystemControl.CCSIDR.Get())
-			sets.Set((ccsidr.Get() & SCB_CCSIDR_NUMSETS_Msk) >> SCB_CCSIDR_NUMSETS_Pos)
-			for sets.Get() != 0 {
-				ways.Set((ccsidr.Get() & SCB_CCSIDR_ASSOCIATIVITY_Msk) >> SCB_CCSIDR_ASSOCIATIVITY_Pos)
-				for ways.Get() != 0 {
-					SystemControl.DCCISW.Set(
-						((sets.Get() << SCB_DCCISW_SET_Pos) & SCB_DCCISW_SET_Msk) |
-							((ways.Get() << SCB_DCCISW_WAY_Pos) & SCB_DCCISW_WAY_Msk))
-					ways.Set(ways.Get() - 1)
-				}
-				sets.Set(sets.Get() - 1)
-			}
-			arm.AsmFull(`
-        dsb 0xF
-        isb 0xF
-      `, nil)
-		}
-	}
-}
@@ -1,130 +0,0 @@
-#ifdef __riscv_flen
-#define NREG 48
-#define LFREG flw
-#define SFREG fsw
-#else
-#define NREG 16
-#endif
-
-#if __riscv_xlen==64
-#define REGSIZE 8
-#define SREG sd
-#define LREG ld
-#else
-#define REGSIZE 4
-#define SREG sw
-#define LREG lw
-#endif
-
-.section .text.handleInterruptASM
-.global handleInterruptASM
-.type handleInterruptASM,@function
-handleInterruptASM:
-    // Save and restore all registers, because the hardware only saves/restores
-    // the pc.
-    // Note: we have to do this in assembly because the "interrupt"="machine"
-    // attribute is broken in LLVM: https://bugs.llvm.org/show_bug.cgi?id=42984
-    addi    sp, sp, -NREG*REGSIZE
-    SREG    ra, 0*REGSIZE(sp)
-    SREG    t0, 1*REGSIZE(sp)
-    SREG    t1, 2*REGSIZE(sp)
-    SREG    t2, 3*REGSIZE(sp)
-    SREG    a0, 4*REGSIZE(sp)
-    SREG    a1, 5*REGSIZE(sp)
-    SREG    a2, 6*REGSIZE(sp)
-    SREG    a3, 7*REGSIZE(sp)
-    SREG    a4, 8*REGSIZE(sp)
-    SREG    a5, 9*REGSIZE(sp)
-    SREG    a6, 10*REGSIZE(sp)
-    SREG    a7, 11*REGSIZE(sp)
-    SREG    t3, 12*REGSIZE(sp)
-    SREG    t4, 13*REGSIZE(sp)
-    SREG    t5, 14*REGSIZE(sp)
-    SREG    t6, 15*REGSIZE(sp)
-#ifdef __riscv_flen
-    SFREG   f0, (0  + 16)*REGSIZE(sp)
-    SFREG   f1, (1  + 16)*REGSIZE(sp)
-    SFREG   f2, (2  + 16)*REGSIZE(sp)
-    SFREG   f3, (3  + 16)*REGSIZE(sp)
-    SFREG   f4, (4  + 16)*REGSIZE(sp)
-    SFREG   f5, (5  + 16)*REGSIZE(sp)
-    SFREG   f6, (6  + 16)*REGSIZE(sp)
-    SFREG   f7, (7  + 16)*REGSIZE(sp)
-    SFREG   f8, (8  + 16)*REGSIZE(sp)
-    SFREG   f9, (9  + 16)*REGSIZE(sp)
-    SFREG   f10,(10 + 16)*REGSIZE(sp)
-    SFREG   f11,(11 + 16)*REGSIZE(sp)
-    SFREG   f12,(12 + 16)*REGSIZE(sp)
-    SFREG   f13,(13 + 16)*REGSIZE(sp)
-    SFREG   f14,(14 + 16)*REGSIZE(sp)
-    SFREG   f15,(15 + 16)*REGSIZE(sp)
-    SFREG   f16,(16 + 16)*REGSIZE(sp)
-    SFREG   f17,(17 + 16)*REGSIZE(sp)
-    SFREG   f18,(18 + 16)*REGSIZE(sp)
-    SFREG   f19,(19 + 16)*REGSIZE(sp)
-    SFREG   f20,(20 + 16)*REGSIZE(sp)
-    SFREG   f21,(21 + 16)*REGSIZE(sp)
-    SFREG   f22,(22 + 16)*REGSIZE(sp)
-    SFREG   f23,(23 + 16)*REGSIZE(sp)
-    SFREG   f24,(24 + 16)*REGSIZE(sp)
-    SFREG   f25,(25 + 16)*REGSIZE(sp)
-    SFREG   f26,(26 + 16)*REGSIZE(sp)
-    SFREG   f27,(27 + 16)*REGSIZE(sp)
-    SFREG   f28,(28 + 16)*REGSIZE(sp)
-    SFREG   f29,(29 + 16)*REGSIZE(sp)
-    SFREG   f30,(30 + 16)*REGSIZE(sp)
-    SFREG   f31,(31 + 16)*REGSIZE(sp)
-#endif
-    call    handleInterrupt
-#ifdef __riscv_flen
-    LFREG   f0, (31 + 16)*REGSIZE(sp)
-    LFREG   f1, (30 + 16)*REGSIZE(sp)
-    LFREG   f2, (29 + 16)*REGSIZE(sp)
-    LFREG   f3, (28 + 16)*REGSIZE(sp)
-    LFREG   f4, (27 + 16)*REGSIZE(sp)
-    LFREG   f5, (26 + 16)*REGSIZE(sp)
-    LFREG   f6, (25 + 16)*REGSIZE(sp)
-    LFREG   f7, (24 + 16)*REGSIZE(sp)
-    LFREG   f8, (23 + 16)*REGSIZE(sp)
-    LFREG   f9, (22 + 16)*REGSIZE(sp)
-    LFREG   f10,(21 + 16)*REGSIZE(sp)
-    LFREG   f11,(20 + 16)*REGSIZE(sp)
-    LFREG   f12,(19 + 16)*REGSIZE(sp)
-    LFREG   f13,(18 + 16)*REGSIZE(sp)
-    LFREG   f14,(17 + 16)*REGSIZE(sp)
-    LFREG   f15,(16 + 16)*REGSIZE(sp)
-    LFREG   f16,(15 + 16)*REGSIZE(sp)
-    LFREG   f17,(14 + 16)*REGSIZE(sp)
-    LFREG   f18,(13 + 16)*REGSIZE(sp)
-    LFREG   f19,(12 + 16)*REGSIZE(sp)
-    LFREG   f20,(11 + 16)*REGSIZE(sp)
-    LFREG   f21,(10 + 16)*REGSIZE(sp)
-    LFREG   f22,(9 + 16)*REGSIZE(sp)
-    LFREG   f23,(8 + 16)*REGSIZE(sp)
-    LFREG   f24,(7 + 16)*REGSIZE(sp)
-    LFREG   f25,(6 + 16)*REGSIZE(sp)
-    LFREG   f26,(5 + 16)*REGSIZE(sp)
-    LFREG   f27,(4 + 16)*REGSIZE(sp)
-    LFREG   f28,(3 + 16)*REGSIZE(sp)
-    LFREG   f29,(2 + 16)*REGSIZE(sp)
-    LFREG   f30,(1 + 16)*REGSIZE(sp)
-    LFREG   f31,(0 + 16)*REGSIZE(sp)
-#endif
-    LREG    t6, 15*REGSIZE(sp)
-    LREG    t5, 14*REGSIZE(sp)
-    LREG    t4, 13*REGSIZE(sp)
-    LREG    t3, 12*REGSIZE(sp)
-    LREG    a7, 11*REGSIZE(sp)
-    LREG    a6, 10*REGSIZE(sp)
-    LREG    a5, 9*REGSIZE(sp)
-    LREG    a4, 8*REGSIZE(sp)
-    LREG    a3, 7*REGSIZE(sp)
-    LREG    a2, 6*REGSIZE(sp)
-    LREG    a1, 5*REGSIZE(sp)
-    LREG    a0, 4*REGSIZE(sp)
-    LREG    t2, 3*REGSIZE(sp)
-    LREG    t1, 2*REGSIZE(sp)
-    LREG    t0, 1*REGSIZE(sp)
-    LREG    ra, 0*REGSIZE(sp)
-    addi    sp, sp, NREG*REGSIZE
-    mret
@@ -19,19 +19,3 @@ func Asm(asm string)
 // You can use {} in the asm string (which expands to a register) to set the
 // return value.
 func AsmFull(asm string, regs map[string]interface{}) uintptr
-
-// DisableInterrupts disables all interrupts, and returns the old interrupt
-// state.
-func DisableInterrupts() uintptr {
-	// Note: this can be optimized with a CSRRW instruction, which atomically
-	// swaps the value and returns the old value.
-	mask := MIE.Get()
-	MIE.Set(0)
-	return mask
-}
-
-// EnableInterrupts enables all interrupts again. The value passed in must be
-// the mask returned by DisableInterrupts.
-func EnableInterrupts(mask uintptr) {
-	MIE.Set(mask)
-}
@@ -9,12 +9,52 @@ _start:
    // Load the globals pointer. The program will load pointers relative to this
    // register, so it must be set to the right value on startup.
    // See: https://gnu-mcu-eclipse.github.io/arch/riscv/programmer/#the-gp-global-pointer-register
-    // Linker relaxations must be disabled to avoid the initialization beign
-    // relaxed with an uninitialized global pointer: mv gp, gp
-    .option push
-    .option norelax
    la gp,      __global_pointer$
-    .option pop

    // Jump to runtime.main
    call main
+
+.section .text.handleInterruptASM
+.global handleInterruptASM
+.type handleInterruptASM,@function
+handleInterruptASM:
+    // Save and restore all registers, because the hardware only saves/restores
+    // the pc.
+    // Note: we have to do this in assembly because the "interrupt"="machine"
+    // attribute is broken in LLVM: https://bugs.llvm.org/show_bug.cgi?id=42984
+    addi    sp, sp, -64
+    sw      ra, 60(sp)
+    sw      t0, 56(sp)
+    sw      t1, 52(sp)
+    sw      t2, 48(sp)
+    sw      a0, 44(sp)
+    sw      a1, 40(sp)
+    sw      a2, 36(sp)
+    sw      a3, 32(sp)
+    sw      a4, 28(sp)
+    sw      a5, 24(sp)
+    sw      a6, 20(sp)
+    sw      a7, 16(sp)
+    sw      t3, 12(sp)
+    sw      t4, 8(sp)
+    sw      t5, 4(sp)
+    sw      t6, 0(sp)
+    call    handleInterrupt
+    lw      t6, 0(sp)
+    lw      t5, 4(sp)
+    lw      t4, 8(sp)
+    lw      t3, 12(sp)
+    lw      a7, 16(sp)
+    lw      a6, 20(sp)
+    lw      a5, 24(sp)
+    lw      a4, 28(sp)
+    lw      a3, 32(sp)
+    lw      a2, 36(sp)
+    lw      a1, 40(sp)
+    lw      a0, 44(sp)
+    lw      t2, 48(sp)
+    lw      t1, 52(sp)
+    lw      t0, 56(sp)
+    lw      ra, 60(sp)
+    addi    sp, sp, 64
+    mret
@@ -1,71 +0,0 @@
-// Hand created file. DO NOT DELETE.
-// atsamd51x bitfield definitions that are not auto-generated by gen-device-svd.go
-
-// +build sam,atsamd51
-
-// These are the supported pchctrl function numberings on the atsamd51x
-// See http://ww1.microchip.com/downloads/en/DeviceDoc/SAM_D5xE5x_Family_Data_Sheet_DS60001507F.pdf
-// table 14-9
-
-package sam
-
-const (
-	PCHCTRL_GCLK_OSCCTRL_DFLL48     = 0 // DFLL48 input clock source
-	PCHCTRL_GCLK_OSCCTRL_FDPLL0     = 1 // Reference clock for FDPLL0
-	PCHCTRL_GCLK_OSCCTRL_FDPLL1     = 2 // Reference clock for FDPLL1
-	PCHCTRL_GCLK_OSCCTRL_FDPLL0_32K = 3 // FDPLL0 = 3 // 32KHz clock for internal lock timer
-	PCHCTRL_GCLK_OSCCTRL_FDPLL1_32K = 3 // FDPLL1 = 3 // 32KHz clock for internal lock timer
-	PCHCTRL_GCLK_SDHC0_SLOW         = 3 // SDHC0 = 3 // Slow
-	PCHCTRL_GCLK_SDHC1_SLOW         = 3 // SDHC1 = 3 // Slow
-	PCHCTRL_GCLK_SERCOMX_SLOW       = 3 // GCLK_SERCOM[0..7]_SLOW = 3
-	PCHCTRL_GCLK_EIC                = 4
-	PCHCTRL_GCLK_FREQM_MSR          = 5 // FREQM Measure
-	PCHCTRL_GCLK_FREQM_REF          = 6 // FREQM Reference
-	PCHCTRL_GCLK_SERCOM0_CORE       = 7 // SERCOM0 Core
-	PCHCTRL_GCLK_SERCOM1_CORE       = 8 // SERCOM1 Core
-	PCHCTRL_GCLK_TC0                = 9
-	PCHCTRL_GCLK_TC1                = 9  // TC0, TC1
-	PCHCTRL_GCLK_USB                = 10 // USB
-	PCHCTRL_GCLK_EVSYS0             = 11
-	PCHCTRL_GCLK_EVSYS1             = 12
-	PCHCTRL_GCLK_EVSYS2             = 13
-	PCHCTRL_GCLK_EVSYS3             = 14
-	PCHCTRL_GCLK_EVSYS4             = 15
-	PCHCTRL_GCLK_EVSYS5             = 16
-	PCHCTRL_GCLK_EVSYS6             = 17
-	PCHCTRL_GCLK_EVSYS7             = 18
-	PCHCTRL_GCLK_EVSYS8             = 19
-	PCHCTRL_GCLK_EVSYS9             = 20
-	PCHCTRL_GCLK_EVSYS10            = 21
-	PCHCTRL_GCLK_EVSYS11            = 22
-	PCHCTRL_GCLK_SERCOM2_CORE       = 23 // SERCOM2 Core
-	PCHCTRL_GCLK_SERCOM3_CORE       = 24 // SERCOM3 Core
-	PCHCTRL_GCLK_TCC0               = 25
-	PCHCTRL_GCLK_TCC1               = 25 // TCC0, TCC1
-	PCHCTRL_GCLK_TC2                = 26
-	PCHCTRL_GCLK_TC3                = 26 // TC2, TC3
-	PCHCTRL_GCLK_CAN0               = 27 // CAN0
-	PCHCTRL_GCLK_CAN1               = 28 // CAN1
-	PCHCTRL_GCLK_TCC2               = 29
-	PCHCTRL_GCLK_TCC3               = 29 // TCC2, TCC3
-	PCHCTRL_GCLK_TC4                = 30
-	PCHCTRL_GCLK_TC5                = 30 // TC4, TC5
-	PCHCTRL_GCLK_PDEC               = 31 // PDEC
-	PCHCTRL_GCLK_AC                 = 32 // AC
-	PCHCTRL_GCLK_CCL                = 33 // CCL
-	PCHCTRL_GCLK_SERCOM4_CORE       = 34 // SERCOM4 Core
-	PCHCTRL_GCLK_SERCOM5_CORE       = 35 // SERCOM5 Core
-	PCHCTRL_GCLK_SERCOM6_CORE       = 36 // SERCOM6 Core
-	PCHCTRL_GCLK_SERCOM7_CORE       = 37 // SERCOM7 Core
-	PCHCTRL_GCLK_TCC4               = 38 // TCC4
-	PCHCTRL_GCLK_TC6                = 39
-	PCHCTRL_GCLK_TC7                = 39 // TC6, TC7
-	PCHCTRL_GCLK_ADC0               = 40 // ADC0
-	PCHCTRL_GCLK_ADC1               = 41 // ADC1
-	PCHCTRL_GCLK_DAC                = 42 // DAC
-	PCHCTRL_GCLK_I2S0               = 43
-	PCHCTRL_GCLK_I2S1               = 44
-	PCHCTRL_GCLK_SDHC0              = 45 // SDHC0
-	PCHCTRL_GCLK_SDHC1              = 46 // SDHC1
-	PCHCTRL_GCLK_CM4_TRACE          = 47 // CM4 Trace
-)
@@ -1,9 +1,7 @@
-// Hand created file. DO NOT DELETE.
-// STM32FXXX (except stm32f1xx) bitfield definitions that are not
-//  auto-generated by gen-device-svd.go
-// +build stm32f4
+// These are the supported alternate function numberings on the stm32f407
+// +build stm32,stm32f407

-// Alternate function settings on the stm32f4 series
+// Alternate function settings on the stm32f4xx series

 package stm32

@@ -5,14 +5,16 @@ import (
 	"time"
 )

+// This example assumes that the button is connected to pin 8. Change the value
+// below to use a different pin.
 const (
 	led    = machine.LED
-	button = machine.BUTTON
+	button = machine.Pin(8)
 )

 func main() {
 	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	button.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	button.Configure(machine.PinConfig{Mode: machine.PinInput})

 	for {
 		if button.Get() {
@@ -1,13 +0,0 @@
-// +build circuitplay_express
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	enable := machine.PA30
-	enable.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	enable.Set(true)
-}
@@ -1,36 +0,0 @@
-// Simplistic example using the DAC on the Circuit Playground Express.
-//
-// To actually use the DAC for producing complex waveforms or samples requires a DMA
-// timer-based playback mechanism which is beyond the scope of this example.
-package main
-
-import (
-	"machine"
-	"time"
-)
-
-func main() {
-	speaker := machine.A0
-	speaker.Configure(machine.PinConfig{Mode: machine.PinOutput})
-
-	machine.DAC0.Configure(machine.DACConfig{})
-
-	data := []uint16{0xFFFF, 0x8000, 0x4000, 0x2000, 0x1000, 0x0000}
-
-	for {
-		for _, val := range data {
-			play(val)
-			time.Sleep(500 * time.Millisecond)
-		}
-	}
-}
-
-func play(val uint16) {
-	for i := 0; i < 100; i++ {
-		machine.DAC0.Set(val)
-		time.Sleep(2 * time.Millisecond)
-
-		machine.DAC0.Set(0)
-		time.Sleep(2 * time.Millisecond)
-	}
-}
@@ -1,13 +0,0 @@
-// +build pyportal
-
-package main
-
-import (
-	"machine"
-)
-
-func init() {
-	enable := machine.SPK_SD
-	enable.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	enable.Set(true)
-}
@@ -1,10 +0,0 @@
-// +build circuitplay_express
-
-package main
-
-import "machine"
-
-const (
-	buttonMode      = machine.PinInputPulldown
-	buttonPinChange = machine.PinFalling
-)
@@ -1,10 +0,0 @@
-// +build pca10040
-
-package main
-
-import "machine"
-
-const (
-	buttonMode      = machine.PinInputPullup
-	buttonPinChange = machine.PinRising
-)
@@ -1,52 +0,0 @@
-package main
-
-// This example demonstrates how to use pin change interrupts.
-//
-// This is only an example and should not be copied directly in any serious
-// circuit, because it lacks an important feature: debouncing.
-// See: https://en.wikipedia.org/wiki/Switch#Contact_bounce
-
-import (
-	"machine"
-	"runtime/volatile"
-	"time"
-)
-
-const (
-	button = machine.BUTTON
-	led    = machine.LED
-)
-
-func main() {
-	var lightLed volatile.Register8
-	lightLed.Set(0)
-
-	// Configure the LED, defaulting to on (usually setting the pin to low will
-	// turn the LED on).
-	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	led.Low()
-
-	// Make sure the pin is configured as a pullup to avoid floating inputs.
-	// Pullup works for most buttons, as most buttons short to ground when
-	// pressed.
-	button.Configure(machine.PinConfig{Mode: buttonMode})
-
-	// Set an interrupt on this pin.
-	err := button.SetInterrupt(buttonPinChange, func(machine.Pin) {
-		if lightLed.Get() != 0 {
-			lightLed.Set(0)
-			led.Low()
-		} else {
-			lightLed.Set(1)
-			led.High()
-		}
-	})
-	if err != nil {
-		println("could not configure pin interrupt:", err.Error())
-	}
-
-	// Make sure the program won't exit.
-	for {
-		time.Sleep(time.Hour)
-	}
-}
@@ -1,10 +0,0 @@
-// +build wioterminal
-
-package main
-
-import "machine"
-
-const (
-	buttonMode      = machine.PinInput
-	buttonPinChange = machine.PinFalling
-)
@@ -8,9 +8,9 @@ import (
 // This example assumes that an RGB LED is connected to pins 3, 5 and 6 on an Arduino.
 // Change the values below to use different pins.
 const (
-	redPin   = machine.D4
-	greenPin = machine.D5
-	bluePin  = machine.D6
+	redPin   = 3
+	greenPin = 5
+	bluePin  = 6
 )

 // cycleColor is just a placeholder until math/rand or some equivalent is working.
@@ -28,16 +28,13 @@ func main() {
 	machine.InitPWM()

 	red := machine.PWM{redPin}
-	err := red.Configure()
-	checkError(err, "failed to configure red pin")
+	red.Configure()

 	green := machine.PWM{greenPin}
-	err = green.Configure()
-	checkError(err, "failed to configure green pin")
+	green.Configure()

 	blue := machine.PWM{bluePin}
-	err = blue.Configure()
-	checkError(err, "failed to configure blue pin")
+	blue.Configure()

 	var rc uint8
 	var gc uint8 = 20
@@ -55,10 +52,3 @@ func main() {
 		time.Sleep(time.Millisecond * 500)
 	}
 }
-
-func checkError(err error, msg string) {
-	if err != nil {
-		print(msg, ": ", err.Error())
-		println()
-	}
-}
@@ -5,8 +5,6 @@ import (
 	"machine"
 )

-var timerCh = make(chan struct{}, 1)
-
 func main() {
 	machine.LED.Configure(machine.PinConfig{Mode: machine.PinOutput})

@@ -14,18 +12,17 @@ func main() {
 	arm.SetupSystemTimer(machine.CPUFrequency() / 10)

 	for {
-		machine.LED.Low()
-		<-timerCh
-		machine.LED.High()
-		<-timerCh
 	}
 }

+var led_state bool
+
 //export SysTick_Handler
 func timer_isr() {
-	select {
-	case timerCh <- struct{}{}:
-	default:
-		// The consumer is running behind.
+	if led_state {
+		machine.LED.Low()
+	} else {
+		machine.LED.High()
 	}
+	led_state = !led_state
 }
@@ -1,253 +0,0 @@
-package bytealg
-
-const (
-	// Index can search any valid length of string.
-
-	MaxLen        = int(-1) >> 31
-	MaxBruteForce = MaxLen
-)
-
-// Compare two byte slices.
-// Returns -1 if the first differing byte is lower in a, or 1 if the first differing byte is greater in b.
-// If the byte slices are equal, returns 0.
-// If the lengths are different and there are no differing bytes, compares based on length.
-func Compare(a, b []byte) int {
-	// Compare for differing bytes.
-	for i := 0; i < len(a) && i < len(b); i++ {
-		switch {
-		case a[0] < b[0]:
-			return -1
-		case a[0] > b[0]:
-			return 1
-		}
-	}
-
-	// Compare lengths.
-	switch {
-	case len(a) > len(b):
-		return 1
-	case len(a) < len(b):
-		return -1
-	default:
-		return 0
-	}
-}
-
-// Count the number of instances of a byte in a slice.
-func Count(b []byte, c byte) int {
-	// Use a simple implementation, as there is no intrinsic that does this like we want.
-	n := 0
-	for _, v := range b {
-		if v == c {
-			n++
-		}
-	}
-	return n
-}
-
-// Count the number of instances of a byte in a string.
-func CountString(s string, c byte) int {
-	// Use a simple implementation, as there is no intrinsic that does this like we want.
-	// Currently, the compiler does not generate zero-copy byte-string conversions, so this needs to be seperate from Count.
-	n := 0
-	for i := 0; i < len(s); i++ {
-		if s[i] == c {
-			n++
-		}
-	}
-	return n
-}
-
-// Cutover is not reachable in TinyGo, but must exist as it is referenced.
-func Cutover(n int) int {
-	// Setting MaxLen and MaxBruteForce should force a different path to be taken.
-	// This should never be called.
-	panic("cutover is unreachable")
-}
-
-// Equal checks if two byte slices are equal.
-// It is equivalent to bytes.Equal.
-func Equal(a, b []byte) bool {
-	if len(a) != len(b) {
-		return false
-	}
-
-	for i, v := range a {
-		if v != b[i] {
-			return false
-		}
-	}
-
-	return true
-}
-
-// Index finds the base index of the first instance of the byte sequence b in a.
-// If a does not contain b, this returns -1.
-func Index(a, b []byte) int {
-	for i := 0; i <= len(a)-len(b); i++ {
-		if Equal(a[i:i+len(b)], b) {
-			return i
-		}
-	}
-	return -1
-}
-
-// Index finds the index of the first instance of the specified byte in the slice.
-// If the byte is not found, this returns -1.
-func IndexByte(b []byte, c byte) int {
-	for i, v := range b {
-		if v == c {
-			return i
-		}
-	}
-	return -1
-}
-
-// Index finds the index of the first instance of the specified byte in the string.
-// If the byte is not found, this returns -1.
-func IndexByteString(s string, c byte) int {
-	for i := 0; i < len(s); i++ {
-		if s[i] == c {
-			return i
-		}
-	}
-	return -1
-}
-
-// Index finds the base index of the first instance of a substring in a string.
-// If the substring is not found, this returns -1.
-func IndexString(str, sub string) int {
-	for i := 0; i <= len(str)-len(sub); i++ {
-		if str[i:i+len(sub)] == sub {
-			return i
-		}
-	}
-	return -1
-}
-
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// The following code has been copied from the Go 1.15 release tree.
-
-// PrimeRK is the prime base used in Rabin-Karp algorithm.
-const PrimeRK = 16777619
-
-// HashStrBytes returns the hash and the appropriate multiplicative
-// factor for use in Rabin-Karp algorithm.
-func HashStrBytes(sep []byte) (uint32, uint32) {
-	hash := uint32(0)
-	for i := 0; i < len(sep); i++ {
-		hash = hash*PrimeRK + uint32(sep[i])
-	}
-	var pow, sq uint32 = 1, PrimeRK
-	for i := len(sep); i > 0; i >>= 1 {
-		if i&1 != 0 {
-			pow *= sq
-		}
-		sq *= sq
-	}
-	return hash, pow
-}
-
-// HashStr returns the hash and the appropriate multiplicative
-// factor for use in Rabin-Karp algorithm.
-func HashStr(sep string) (uint32, uint32) {
-	hash := uint32(0)
-	for i := 0; i < len(sep); i++ {
-		hash = hash*PrimeRK + uint32(sep[i])
-	}
-	var pow, sq uint32 = 1, PrimeRK
-	for i := len(sep); i > 0; i >>= 1 {
-		if i&1 != 0 {
-			pow *= sq
-		}
-		sq *= sq
-	}
-	return hash, pow
-}
-
-// HashStrRevBytes returns the hash of the reverse of sep and the
-// appropriate multiplicative factor for use in Rabin-Karp algorithm.
-func HashStrRevBytes(sep []byte) (uint32, uint32) {
-	hash := uint32(0)
-	for i := len(sep) - 1; i >= 0; i-- {
-		hash = hash*PrimeRK + uint32(sep[i])
-	}
-	var pow, sq uint32 = 1, PrimeRK
-	for i := len(sep); i > 0; i >>= 1 {
-		if i&1 != 0 {
-			pow *= sq
-		}
-		sq *= sq
-	}
-	return hash, pow
-}
-
-// HashStrRev returns the hash of the reverse of sep and the
-// appropriate multiplicative factor for use in Rabin-Karp algorithm.
-func HashStrRev(sep string) (uint32, uint32) {
-	hash := uint32(0)
-	for i := len(sep) - 1; i >= 0; i-- {
-		hash = hash*PrimeRK + uint32(sep[i])
-	}
-	var pow, sq uint32 = 1, PrimeRK
-	for i := len(sep); i > 0; i >>= 1 {
-		if i&1 != 0 {
-			pow *= sq
-		}
-		sq *= sq
-	}
-	return hash, pow
-}
-
-// IndexRabinKarpBytes uses the Rabin-Karp search algorithm to return the index of the
-// first occurence of substr in s, or -1 if not present.
-func IndexRabinKarpBytes(s, sep []byte) int {
-	// Rabin-Karp search
-	hashsep, pow := HashStrBytes(sep)
-	n := len(sep)
-	var h uint32
-	for i := 0; i < n; i++ {
-		h = h*PrimeRK + uint32(s[i])
-	}
-	if h == hashsep && Equal(s[:n], sep) {
-		return 0
-	}
-	for i := n; i < len(s); {
-		h *= PrimeRK
-		h += uint32(s[i])
-		h -= pow * uint32(s[i-n])
-		i++
-		if h == hashsep && Equal(s[i-n:i], sep) {
-			return i - n
-		}
-	}
-	return -1
-}
-
-// IndexRabinKarp uses the Rabin-Karp search algorithm to return the index of the
-// first occurence of substr in s, or -1 if not present.
-func IndexRabinKarp(s, substr string) int {
-	// Rabin-Karp search
-	hashss, pow := HashStr(substr)
-	n := len(substr)
-	var h uint32
-	for i := 0; i < n; i++ {
-		h = h*PrimeRK + uint32(s[i])
-	}
-	if h == hashss && s[:n] == substr {
-		return 0
-	}
-	for i := n; i < len(s); {
-		h *= PrimeRK
-		h += uint32(s[i])
-		h -= pow * uint32(s[i-n])
-		i++
-		if h == hashss && s[i-n:i] == substr {
-			return i - n
-		}
-	}
-	return -1
-}
@@ -1,7 +1,5 @@
 package task

-import "runtime/interrupt"
-
 const asserts = false

 // Queue is a FIFO container of tasks.
@@ -12,9 +10,7 @@ type Queue struct {

 // Push a task onto the queue.
 func (q *Queue) Push(t *Task) {
-	i := interrupt.Disable()
 	if asserts && t.Next != nil {
-		interrupt.Restore(i)
 		panic("runtime: pushing a task to a queue with a non-nil Next pointer")
 	}
 	if q.tail != nil {
@@ -25,15 +21,12 @@ func (q *Queue) Push(t *Task) {
 	if q.head == nil {
 		q.head = t
 	}
-	interrupt.Restore(i)
 }

 // Pop a task off of the queue.
 func (q *Queue) Pop() *Task {
-	i := interrupt.Disable()
 	t := q.head
 	if t == nil {
-		interrupt.Restore(i)
 		return nil
 	}
 	q.head = t.Next
@@ -41,13 +34,11 @@ func (q *Queue) Pop() *Task {
 		q.tail = nil
 	}
 	t.Next = nil
-	interrupt.Restore(i)
 	return t
 }

 // Append pops the contents of another queue and pushes them onto the end of this queue.
 func (q *Queue) Append(other *Queue) {
-	i := interrupt.Disable()
 	if q.head == nil {
 		q.head = other.head
 	} else {
@@ -55,15 +46,6 @@ func (q *Queue) Append(other *Queue) {
 	}
 	q.tail = other.tail
 	other.head, other.tail = nil, nil
-	interrupt.Restore(i)
-}
-
-// Empty checks if the queue is empty.
-func (q *Queue) Empty() bool {
-	i := interrupt.Disable()
-	empty := q.head == nil
-	interrupt.Restore(i)
-	return empty
 }

 // Stack is a LIFO container of tasks.
@@ -75,24 +57,19 @@ type Stack struct {

 // Push a task onto the stack.
 func (s *Stack) Push(t *Task) {
-	i := interrupt.Disable()
 	if asserts && t.Next != nil {
-		interrupt.Restore(i)
 		panic("runtime: pushing a task to a stack with a non-nil Next pointer")
 	}
 	s.top, t.Next = t, s.top
-	interrupt.Restore(i)
 }

 // Pop a task off of the stack.
 func (s *Stack) Pop() *Task {
-	i := interrupt.Disable()
 	t := s.top
 	if t != nil {
 		s.top = t.Next
-		t.Next = nil
 	}
-	interrupt.Restore(i)
+	t.Next = nil
 	return t
 }

@@ -112,13 +89,10 @@ func (t *Task) tail() *Task {
 // Queue moves the contents of the stack into a queue.
 // Elements can be popped from the queue in the same order that they would be popped from the stack.
 func (s *Stack) Queue() Queue {
-	i := interrupt.Disable()
 	head := s.top
 	s.top = nil
-	q := Queue{
+	return Queue{
 		head: head,
 		tail: head.tail(),
 	}
-	interrupt.Restore(i)
-	return q
 }
@@ -18,8 +18,3 @@ type Task struct {
 	// state is the underlying running state of the task.
 	state state
 }
-
-// getGoroutineStackSize is a compiler intrinsic that returns the stack size for
-// the given function and falls back to the default stack size. It is replaced
-// with a load from a special section just before codegen.
-func getGoroutineStackSize(fn uintptr) uintptr
@@ -67,7 +67,7 @@ func createTask() *Task {
 // start invokes a function in a new goroutine. Calls to this are inserted by the compiler.
 // The created goroutine starts running immediately.
 // This is implemented inside the compiler.
-func start(fn uintptr, args unsafe.Pointer, stackSize uintptr)
+func start(fn uintptr, args unsafe.Pointer)

 // Current returns the current active task.
 // This is implemented inside the compiler.
@@ -85,14 +85,9 @@ type taskHolder interface {
 	getReturnPtr() unsafe.Pointer
 }

-// If there are no direct references to the task methods, they will not be discovered by the compiler, and this will trigger a compiler error.
-// Instantiating this interface forces discovery of these methods.
-var _ = taskHolder((*Task)(nil))
-
 func fake() {
 	// Hack to ensure intrinsics are discovered.
 	Current()
-	go func() {}()
 	Pause()
 }

@@ -17,7 +17,7 @@ func Current() *Task {
 }

 //go:noinline
-func start(fn uintptr, args unsafe.Pointer, stackSize uintptr) {
+func start(fn uintptr, args unsafe.Pointer) {
 	// The compiler will error if this is reachable.
 	runtimePanic("scheduler is disabled")
 }
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Ayke van Laethem	ca7b95039d	interp: do not rely on fixed type names After merging multiple LLVM modules into one, types may have been renamed. Therefore, the interp package should not rely on types to have any particular name.	2020-05-03 15:43:45 +02:00
Ayke van Laethem	7939c060ce	compiler: include type information about the runtime in the compiler These types are often known to the compiler already. Moving them into the compiler is an important step for two related reasons: * It makes the compiler better testable. Together with https://github.com/tinygo-org/tinygo/pull/1008 it will make it possible to test the compiler without having to load the runtime package. * It makes it easier to compile packages independently as the type information of the runtime package doesn't need to be present. I had to use hack to get this to work well: internal/task.Task is now an opaque struct. This is necessary because there is a dependency from runtime.channel -> runtime.channelBlockedList -> *internal/task.Task. I don't want to include the definition of the internal/task.Task struct in the compiler directly as that would make changing the internal/task package a lot harder and the compiler doesn't need to know the layout of that struct anyway.	2020-05-03 15:43:45 +02:00
Ayke van Laethem	dd04f34059	compiler: integrate ir package into compiler package The ir package has long lost its original purpose (which was doing some analysis and optimization on the Go SSA directly). There is very little of it left, which is best integrated directly in the compiler package to avoid unnecessary abstraction.	2020-05-03 15:43:45 +02:00
Ayke van Laethem	f58e75c386	compiler: add tests This commit adds a very small test case. More importantly, it adds a framework for other tests to be added in the future.	2020-05-03 15:43:45 +02:00
Ayke van Laethem	b8db79f6a6	compiler: compile all functions/methods, remove SimpleDCE This is important because once we move to compiling packages independently, SimpleDCE can't work anymore. Instead we'll have to compile all parts of a package and cache that for later reuse.	2020-05-03 15:43:44 +02:00