all: add full LLVM 20 support

This switches the Espressif fork from LLVM 19 to LLVM 20, so we can use
the improvements made between those LLVM versions. It also better aligns
with the system-LLVM build method, which currently also defaults to LLVM
20.

.circleci/config.yml

@@ -92,20 +92,16 @@ commands:
             - /go/pkg/mod
 
 jobs:
-  test-oldest:
+  test-llvm15-go122:
-    # This tests our lowest supported versions of Go and LLVM, to make sure at
-    # least the smoke tests still pass.
     docker:
       - image: golang:1.22-bullseye
     steps:
       - test-linux:
           llvm: "15"
     resource_class: large
-  test-newest:
+  test-llvm20-go124:
-    # This tests the latest supported LLVM version when linking against system
-    # libraries.
     docker:
-      - image: golang:1.25-bullseye
+      - image: golang:1.24-bullseye
     steps:
       - test-linux:
           llvm: "20"
@@ -114,6 +110,8 @@ jobs:
 workflows:
   test-all:
     jobs:
-      - test-oldest
+      # This tests our lowest supported versions of Go and LLVM, to make sure at
-      # disable this test, since CircleCI seems unable to download due to rate-limits on Dockerhub.
+      # least the smoke tests still pass.
-      # - test-newest
+      - test-llvm15-go122
+      # This tests LLVM 20 support when linking against system libraries.
+      - test-llvm20-go124

.github/workflows/build-macos.yml

@@ -30,16 +30,16 @@ jobs:
         run: |
           HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v4
         with:
           submodules: true
       - name: Extract TinyGo version
         id: version
         run: ./.github/workflows/tinygo-extract-version.sh | tee -a "$GITHUB_OUTPUT"
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.25.1'
+          go-version: '1.24'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v4
@@ -79,7 +79,7 @@ jobs:
           rm -rf llvm-project
           make llvm-source
           # install dependencies
-          HOMEBREW_NO_AUTO_UPDATE=1 brew install ninja
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install cmake ninja
           # build!
           make llvm-build
           find llvm-build -name CMakeFiles -prune -exec rm -r '{}' \;
@@ -130,11 +130,11 @@ jobs:
         run: |
           brew install llvm@${{ matrix.version }}
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v4
       - name: Install Go
-        uses: actions/setup-go@v6
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.25.1'
+          go-version: '1.24'
           cache: true
       - name: Build TinyGo (LLVM ${{ matrix.version }})
         run: go install -tags=llvm${{ matrix.version }}

.github/workflows/linux.yml

@@ -18,7 +18,7 @@ jobs:
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.25-alpine
+      image: golang:1.24-alpine
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
@@ -26,7 +26,7 @@ jobs:
         # tar: needed for actions/cache@v4
         # git+openssh: needed for checkout (I think?)
         # ruby: needed to install fpm
-        run: apk add tar git openssh make g++ ruby-dev mold
+        run: apk add tar git openssh make g++ ruby-dev
       - name: Work around CVE-2022-24765
         # We're not on a multi-user machine, so this is safe.
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
@@ -73,7 +73,7 @@ jobs:
         uses: actions/cache/restore@v4
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-alpine-v1
+          key: llvm-build-20-linux-alpine-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -137,7 +137,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Install wasmtime
         uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -181,7 +181,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Install Node.js
         uses: actions/setup-node@v4
@@ -222,7 +222,7 @@ jobs:
         uses: actions/cache/restore@v4
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-asserts-v1
+          key: llvm-build-20-linux-asserts-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -298,7 +298,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v4
@@ -329,7 +329,7 @@ jobs:
         uses: actions/cache/restore@v4
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-${{ matrix.goarch }}-v1
+          key: llvm-build-20-linux-${{ matrix.goarch }}-v4
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'

.github/workflows/windows.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v4
@@ -147,7 +147,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4
@@ -177,7 +177,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4
@@ -213,7 +213,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.25.0'
+          go-version: '1.24'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v4

.gitmodules

@@ -22,7 +22,7 @@
 	url = https://github.com/tinygo-org/stm32-svd
 [submodule "lib/musl"]
 	path = lib/musl
-	url = https://github.com/tinygo-org/musl-libc.git
+	url = git://git.musl-libc.org/musl
 [submodule "lib/binaryen"]
 	path = lib/binaryen
 	url = https://github.com/WebAssembly/binaryen.git

CHANGELOG.md

@@ -1,55 +1,3 @@
-0.39.0
----
-* **general**
-  - all: add Go 1.25 support
-  - net: update to latest tinygo net package
-  - docs: clarify build verification step for macOS users
-  - Add flag to skip Renesas SVD builds
-* **build**
-  - Makefile: install missing dlmalloc files
-  - flash: add -o flag support to save built binary (Fixes #4937) (#4942)
-  - fix: update version of clang to 17 to accommodate latest Go 1.25 docker base image
-* **ci**
-  - chore: update all CI builds to test Go 1.25 release
-  - fix: disable test-newest since CircleCI seems unable to download due to rate-limits on Dockerhub
-  - ci: rename some jobs to avoid churn on every Go/LLVM version bump
-  - ci: make the goroutines test less racy
-  - tests: de-flake goroutines test
-* **compiler**
-  - compiler: implement internal/abi.Escape
-* **main**
-  - main: show the compiler error (if any) for `tinygo test -c`
-  - chore: correct GOOS=js name in error messages for WASM
-* **machine**
-  - machine: add international keys
-  - machine: remove some unnecessary "// peripherals:" comments
-  - machine: add I2C pin comments
-  - machine: standardize I2C errors with "i2c:" prefix
-  - machine: make I2C usable in the simulator
-  - fix: add SPI and I2C to teensy 4.1 (#4943)
-  - `rp2`: use the correct channel mask for rp2350 ADC; hold lock during read (#4938)
-  - `rp2`: disable digital input for analog inputs
-* **runtime**
-  - runtime: ensure time.Sleep(d) sleeps at least d
-  - runtime: stub out weak pointer support
-  - runtime: implement dummy AddCleanup
-  - runtime: enable multi-core scheduler for rp2350
-  - `internal/task`: use -stack-size flag when starting a new thread
-  - `internal/task`: add SA_RESTART flag to GC interrupts
-  - `internal/task`: a few small correctness fixes
-  - `internal/gclayout`: make gclayout values constants
-  - darwin: add threading support and use it by default
-* **standard library**
-  - `sync`: implement sync.Swap
-  - `reflect`: implement Method.IsExported
-* **testing**
-  - testing: stub out testing.B.Loop
-* **targets**
-  - `stm32`: add support for the STM32L031G6U6
-  - add metro-rp2350 board definition (#4989)
-  - `rp2040/rp2350`: set the default stack size to 8k for rp2040/rp2350 based boards where this was not already the case
-
-
 0.38.0
 ---
 * **general**

Dockerfile

@@ -1,8 +1,8 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.25 AS tinygo-llvm
+FROM golang:1.24 AS tinygo-llvm
 
 RUN apt-get update && \
-    apt-get install -y apt-utils make cmake clang-17 ninja-build && \
+    apt-get install -y apt-utils make cmake clang-15 ninja-build && \
     rm -rf \
         /var/lib/apt/lists/* \
         /var/log/* \
@@ -33,7 +33,7 @@ RUN cd /tinygo/ && \
 
 # tinygo-compiler copies the compiler build over to a base Go container (without
 # all the build tools etc).
-FROM golang:1.25 AS tinygo-compiler
+FROM golang:1.24 AS tinygo-compiler
 
 # Copy tinygo build.
 COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo

GNUmakefile

@@ -79,26 +79,6 @@ ifeq (1, $(STATIC))
     BINARYEN_OPTION += -DCMAKE_CXX_FLAGS="-static" -DCMAKE_C_FLAGS="-static"
 endif
 
-# Optimize the binary size for Linux.
-# These flags may work on other platforms, but have only been tested on Linux.
-ifeq ($(uname),Linux)
-    HAS_MOLD := $(shell command -v ld.mold 2> /dev/null)
-    HAS_LLD := $(shell command -v ld.lld 2> /dev/null)
-    LLVM_CFLAGS := -ffunction-sections -fdata-sections -fvisibility=hidden
-    LLVM_LDFLAGS := -Wl,--gc-sections
-    ifneq ($(HAS_MOLD),)
-        # Mold might be slightly faster.
-        LLVM_LDFLAGS += -fuse-ld=mold -Wl,--icf=all
-    else ifneq ($(HAS_LLD),)
-        # LLD is more commonly available.
-        LLVM_LDFLAGS += -fuse-ld=lld -Wl,--icf=all
-    endif
-    LLVM_OPTION += \
-        -DCMAKE_C_FLAGS="$(LLVM_CFLAGS)" \
-        -DCMAKE_CXX_FLAGS="$(LLVM_CFLAGS)"
-    CGO_LDFLAGS += $(LLVM_LDFLAGS)
-endif
-
 # Cross compiling support.
 ifneq ($(CROSS),)
     CC = $(CROSS)-gcc
@@ -363,6 +343,7 @@ TEST_PACKAGES_FAST = \
 	path \
 	reflect \
 	sync \
+	testing \
 	testing/iotest \
 	text/scanner \
 	unicode \
@@ -479,15 +460,11 @@ TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_WINDOWS)
 TEST_IOFS := false
 endif
 
-TEST_SKIP_FLAG := -skip='TestExtraMethods|TestParseAndBytesRoundTrip/P256/Generic|^Fuzz'
-
 # Test known-working standard library packages.
 # TODO: parallelize, and only show failing tests (no implied -v flag).
 .PHONY: tinygo-test
 tinygo-test:
-	@# TestExtraMethods: used by many crypto packages and uses reflect.Type.Method which is not implemented.
+	$(TINYGO) test $(TEST_PACKAGES_HOST) $(TEST_PACKAGES_SLOW)
-	@# TestParseAndBytesRoundTrip/P256/Generic: relies on t.Skip() which is not implemented
-	$(TINYGO) test $(TEST_SKIP_FLAG) $(TEST_PACKAGES_HOST) $(TEST_PACKAGES_SLOW)
 	@# io/fs requires os.ReadDir, not yet supported on windows or wasi. It also
 	@# requires a large stack-size. Hence, io/fs is only run conditionally.
 	@# For more details, see the comments on issue #3143.
@@ -495,7 +472,7 @@ ifeq ($(TEST_IOFS),true)
 	$(TINYGO) test -stack-size=6MB io/fs
 endif
 tinygo-test-fast:
-	$(TINYGO) test $(TEST_SKIP_FLAG) $(TEST_PACKAGES_HOST)
+	$(TINYGO) test $(TEST_PACKAGES_HOST)
 tinygo-bench:
 	$(TINYGO) test -bench . $(TEST_PACKAGES_HOST) $(TEST_PACKAGES_SLOW)
 tinygo-bench-fast:
@@ -503,18 +480,18 @@ tinygo-bench-fast:
 
 # Same thing, except for wasi rather than the current platform.
 tinygo-test-wasm:
-	$(TINYGO) test -target wasm $(TEST_SKIP_FLAG) $(TEST_PACKAGES_WASM)
+	$(TINYGO) test -target wasm $(TEST_PACKAGES_WASM)
 tinygo-test-wasi:
-	$(TINYGO) test -target wasip1 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
+	$(TINYGO) test -target wasip1 $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
 tinygo-test-wasip1:
-	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
+	GOOS=wasip1 GOARCH=wasm $(TINYGO) test $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_SLOW) ./tests/runtime_wasi
 tinygo-test-wasip1-fast:
-	$(TINYGO) test -target=wasip1 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
+	$(TINYGO) test -target=wasip1 $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
 
 tinygo-test-wasip2-slow:
-	$(TINYGO) test -target=wasip2 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_SLOW)
+	$(TINYGO) test -target=wasip2 $(TEST_PACKAGES_SLOW)
 tinygo-test-wasip2-fast:
-	$(TINYGO) test -target=wasip2 $(TEST_SKIP_FLAG) $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
+	$(TINYGO) test -target=wasip2 $(TEST_PACKAGES_FAST) ./tests/runtime_wasi
 
 tinygo-test-wasip2-sum-slow:
 	TINYGO=$(TINYGO) \
@@ -540,7 +517,7 @@ tinygo-bench-wasip2-fast:
 
 # Run tests on riscv-qemu since that one provides a large amount of memory.
 tinygo-test-baremetal:
-	$(TINYGO) test -target riscv-qemu $(TEST_SKIP_FLAG) $(TEST_PACKAGES_BAREMETAL)
+	$(TINYGO) test -target riscv-qemu $(TEST_PACKAGES_BAREMETAL)
 
 # Test external packages in a large corpus.
 test-corpus:
@@ -794,8 +771,6 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=gopher-badge      examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=gopher-arcade      examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=ae-rp2040           examples/echo
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=thumby              examples/echo
@@ -806,8 +781,6 @@ endif
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pico-plus2          examples/blinky1
 	@$(MD5SUM) test.hex
-	$(TINYGO) build -size short -o test.hex -target=metro-rp2350        examples/blinky1
-	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=waveshare-rp2040-tiny examples/echo
 	@$(MD5SUM) test.hex
 	# test pwm
@@ -972,7 +945,7 @@ endif
 
 
 wasmtest:
-	cd ./tests/wasm && $(GO) test .
+	$(GO) test ./tests/wasm
 
 build/release: tinygo gen-device $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binaryen)
 	@mkdir -p build/release/tinygo/bin
@@ -1119,7 +1092,6 @@ endif
 tools:
 	cd internal/tools && go generate -tags tools ./
 
-LINTDIRS=src/os/ src/reflect/
 .PHONY: lint
 lint: tools ## Lint source tree
 	revive -version
@@ -1127,10 +1099,7 @@ lint: tools ## Lint source tree
 	# revive.toml isn't flexible enough to filter out just one kind of error from a checker, so do it with grep here.
 	# Can't use grep with friendly formatter.  Plain output isn't too bad, though.
 	# Use 'grep .' to get rid of stray blank line
-	revive -config revive.toml compiler/... $$( find $(LINTDIRS) -type f -name '*.go' ) \
+	revive -config revive.toml compiler/... src/{os,reflect}/*.go | grep -v "should have comment or be unexported" | grep '.' | awk '{print}; END {exit NR>0}'
-		| grep -v "should have comment or be unexported" \
-		| grep '.' \
-		| awk '{print}; END {exit NR>0}'
 
 SPELLDIRSCMD=find . -depth 1 -type d  | egrep -wv '.git|lib|llvm|src'; find src -depth 1 | egrep -wv 'device|internal|net|vendor'; find src/internal -depth 1 -type d | egrep -wv src/internal/wasi
 .PHONY: spell

builder/bdwgc.go

@@ -30,10 +30,7 @@ var BoehmGC = Library{
 			// Use a minimal environment.
 			"-DNO_MSGBOX_ON_ERROR", // don't call MessageBoxA on Windows
 			"-DDONT_USE_ATEXIT",
-			"-DNO_GETENV",          // smaller binary, more predictable configuration
+			"-DNO_GETENV",
-			"-DNO_CLOCK",           // don't use system clock
-			"-DNO_DEBUGGING",       // reduce code size
-			"-DGC_NO_FINALIZATION", // finalization is not used at the moment
 
 			// Special flag to work around the lack of __data_start in ld.lld.
 			// TODO: try to fix this in LLVM/lld directly so we don't have to
@@ -42,8 +39,6 @@ var BoehmGC = Library{
 
 			// Do not scan the stack. We have our own mechanism to do this.
 			"-DSTACK_NOT_SCANNED",
-			"-DNO_PROC_STAT",  // we scan the stack manually (don't read /proc/self/stat on Linux)
-			"-DSTACKBOTTOM=0", // dummy value, we scan the stack manually
 
 			// Assertions can be enabled while debugging GC issues.
 			//"-DGC_ASSERTIONS",
@@ -68,6 +63,7 @@ var BoehmGC = Library{
 			"blacklst.c",
 			"dbg_mlc.c",
 			"dyn_load.c",
+			"finalize.c",
 			"headers.c",
 			"mach_dep.c",
 			"malloc.c",
@@ -75,6 +71,7 @@ var BoehmGC = Library{
 			"mark_rts.c",
 			"misc.c",
 			"new_hblk.c",
+			"obj_map.c",
 			"os_dep.c",
 			"reclaim.c",
 		}

builder/build.go

@@ -1046,7 +1046,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		// Special format for the ESP family of chips (parsed by the ROM
 		// bootloader).
 		result.Binary = filepath.Join(tmpdir, "main"+outext)
-		err := makeESPFirmwareImage(result.Executable, result.Binary, outputBinaryFormat)
+		err := makeESPFirmareImage(result.Executable, result.Binary, outputBinaryFormat)
 		if err != nil {
 			return result, err
 		}

builder/config.go

@@ -26,7 +26,7 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 
 	// Version range supported by TinyGo.
 	const minorMin = 19
-	const minorMax = 25
+	const minorMax = 24
 
 	// Check that we support this Go toolchain version.
 	gorootMajor, gorootMinor, err := goenv.GetGorootVersion()

builder/esp.go

@@ -23,7 +23,7 @@ type espImageSegment struct {
 	data []byte
 }
 
-// makeESPFirmwareImage converts an input ELF file to an image file for an ESP32 or
+// makeESPFirmareImage converts an input ELF file to an image file for an ESP32 or
 // ESP8266 chip. This is a special purpose image format just for the ESP chip
 // family, and is parsed by the on-chip mask ROM bootloader.
 //
@@ -31,7 +31,7 @@ type espImageSegment struct {
 // https://github.com/espressif/esptool/wiki/Firmware-Image-Format
 // https://github.com/espressif/esp-idf/blob/8fbb63c2a701c22ccf4ce249f43aded73e134a34/components/bootloader_support/include/esp_image_format.h#L58
 // https://github.com/espressif/esptool/blob/master/esptool.py
-func makeESPFirmwareImage(infile, outfile, format string) error {
+func makeESPFirmareImage(infile, outfile, format string) error {
 	inf, err := elf.Open(infile)
 	if err != nil {
 		return err

builder/sizes_test.go

@@ -42,9 +42,9 @@ func TestBinarySize(t *testing.T) {
 	// This is a small number of very diverse targets that we want to test.
 	tests := []sizeTest{
 		// microcontrollers
-		{"hifive1b", "examples/echo", 3884, 280, 0, 2268},
+		{"hifive1b", "examples/echo", 3836, 280, 0, 2268},
-		{"microbit", "examples/serial", 2852, 360, 8, 2272},
+		{"microbit", "examples/serial", 2916, 388, 8, 2272},
-		{"wioterminal", "examples/pininterrupt", 7337, 1491, 116, 6912},
+		{"wioterminal", "examples/pininterrupt", 7361, 1491, 116, 6912},
 
 		// TODO: also check wasm. Right now this is difficult, because
 		// wasm binaries are run through wasm-opt and therefore the

compiler/inlineasm.go

@@ -38,10 +38,10 @@ func (b *builder) createInlineAsm(args []ssa.Value) (llvm.Value, error) {
 // provided immediately. For example:
 //
 //	arm.AsmFull(
-//	    "str {value}, [{result}]",
+//	    "str {value}, {result}",
 //	    map[string]interface{}{
-//	        "value":  1,
+//	        "value":  1
-//	        "result": uintptr(unsafe.Pointer(&dest)),
+//	        "result": &dest,
 //	    })
 func (b *builder) createInlineAsmFull(instr *ssa.CallCommon) (llvm.Value, error) {
 	asmString := constant.StringVal(instr.Args[0].(*ssa.Const).Value)

compiler/intrinsics.go

@@ -121,29 +121,6 @@ func (b *builder) createKeepAliveImpl() {
 	b.CreateRetVoid()
 }
 
-// createAbiEscapeImpl implements the generic internal/abi.Escape function. It
-// currently only supports pointer types.
-func (b *builder) createAbiEscapeImpl() {
-	b.createFunctionStart(true)
-
-	// The first parameter is assumed to be a pointer. This is checked at the
-	// call site of createAbiEscapeImpl.
-	pointerValue := b.getValue(b.fn.Params[0], getPos(b.fn))
-
-	// Create an equivalent of the following C code, which is basically just a
-	// nop but ensures the pointerValue is kept alive:
-	//
-	//     __asm__ __volatile__("" : : "r"(pointerValue))
-	//
-	// It should be portable to basically everything as the "r" register type
-	// exists basically everywhere.
-	asmType := llvm.FunctionType(b.dataPtrType, []llvm.Type{b.dataPtrType}, false)
-	asmFn := llvm.InlineAsm(asmType, "", "=r,0", true, false, 0, false)
-	result := b.createCall(asmType, asmFn, []llvm.Value{pointerValue}, "")
-
-	b.CreateRet(result)
-}
-
 var mathToLLVMMapping = map[string]string{
 	"math.Ceil":  "llvm.ceil.f64",
 	"math.Exp":   "llvm.exp.f64",

compiler/llvmutil/llvm.go

@@ -218,7 +218,7 @@ func Version() int {
 	return major
 }
 
-// ByteOrder returns the byte order for the given target triple. Most targets are little
+// Return the byte order for the given target triple. Most targets are little
 // endian, but for example MIPS can be big-endian.
 func ByteOrder(target string) binary.ByteOrder {
 	if strings.HasPrefix(target, "mips-") {

compiler/symbol.go

@@ -253,23 +253,6 @@ func (c *compilerContext) maybeCreateSyntheticFunction(fn *ssa.Function, llvmFn
 	// The exception is the package initializer, which does appear in the
 	// *ssa.Package members and so shouldn't be created here.
 	if fn.Synthetic != "" && fn.Synthetic != "package initializer" && fn.Synthetic != "generic function" && fn.Synthetic != "range-over-func yield" {
-		if origin := fn.Origin(); origin != nil && origin.RelString(nil) == "internal/abi.Escape" {
-			// This is a special implementation or internal/abi.Escape, which
-			// can only really be implemented in the compiler.
-			// For simplicity we'll only implement pointer parameters for now.
-			if _, ok := fn.Params[0].Type().Underlying().(*types.Pointer); ok {
-				irbuilder := c.ctx.NewBuilder()
-				defer irbuilder.Dispose()
-				b := newBuilder(c, irbuilder, fn)
-				b.createAbiEscapeImpl()
-				llvmFn.SetLinkage(llvm.LinkOnceODRLinkage)
-				llvmFn.SetUnnamedAddr(true)
-			}
-			// If the parameter is not of a pointer type, it will be left
-			// unimplemented. This will result in a linker error if the function
-			// is really called, making it clear it needs to be implemented.
-			return
-		}
 		if len(fn.Blocks) == 0 {
 			c.addError(fn.Pos(), "missing function body")
 			return
@@ -630,7 +613,7 @@ func (c *compilerContext) addStandardAttributes(llvmFn llvm.Value) {
 // 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).
 type globalInfo struct {
-	linkName string // go:extern, go:linkname
+	linkName string // go:extern
 	extern   bool   // go:extern
 	align    int    // go:align
 	section  string // go:section
@@ -715,14 +698,14 @@ func (c *compilerContext) getGlobalInfo(g *ssa.Global) globalInfo {
 	// Check for //go: pragmas, which may change the link name (among others).
 	doc := c.astComments[info.linkName]
 	if doc != nil {
-		info.parsePragmas(doc, c, g)
+		info.parsePragmas(doc)
 	}
 	return info
 }
 
 // Parse //go: pragma comments from the source. In particular, it parses the
-// //go:extern and //go:linkname pragmas on globals.
+// //go:extern pragma on globals.
-func (info *globalInfo) parsePragmas(doc *ast.CommentGroup, c *compilerContext, g *ssa.Global) {
+func (info *globalInfo) parsePragmas(doc *ast.CommentGroup) {
 	for _, comment := range doc.List {
 		if !strings.HasPrefix(comment.Text, "//go:") {
 			continue
@@ -743,17 +726,6 @@ func (info *globalInfo) parsePragmas(doc *ast.CommentGroup, c *compilerContext,
 			if len(parts) == 2 {
 				info.section = parts[1]
 			}
-		case "//go:linkname":
-			if len(parts) != 3 || parts[1] != g.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(g.Pkg.Pkg) {
-				info.linkName = parts[2]
-			}
 		}
 	}
 }

compiler/testdata/basic.ll

@@ -206,7 +206,7 @@ entry:
   ret void
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nounwind }

compiler/testdata/channel.ll

@@ -107,8 +107,8 @@ select.body:                                      ; preds = %select.next
 
 declare { i32, i1 } @runtime.chanSelect(ptr, ptr, i32, i32, ptr, i32, i32, ptr) #1
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 attributes #4 = { nounwind }

compiler/testdata/float.ll

@@ -93,6 +93,6 @@ entry:
   ret i8 %0
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }

compiler/testdata/func.ll

@@ -44,7 +44,7 @@ entry:
   ret void
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nounwind }

compiler/testdata/gc.ll

@@ -135,7 +135,7 @@ entry:
   ret %runtime._interface %1
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nounwind }

compiler/testdata/go1.20.ll

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

compiler/testdata/go1.21.ll

@@ -171,9 +171,9 @@ declare i32 @llvm.smax.i32(i32, i32) #4
 ; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
 declare i32 @llvm.umax.i32(i32, i32) #4
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nocallback nofree nounwind willreturn memory(argmem: write) }
 attributes #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
 attributes #5 = { nounwind }

compiler/testdata/goroutine-wasm-asyncify.ll

@@ -192,13 +192,13 @@ entry:
   unreachable
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #3 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-gowrapper"="main.regularFunction" }
+attributes #3 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-gowrapper"="main.regularFunction" }
-attributes #4 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-gowrapper"="main.inlineFunctionGoroutine$1" }
+attributes #4 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-gowrapper"="main.inlineFunctionGoroutine$1" }
-attributes #5 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-gowrapper"="main.closureFunctionGoroutine$1" }
+attributes #5 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-gowrapper"="main.closureFunctionGoroutine$1" }
-attributes #6 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-gowrapper" }
+attributes #6 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-gowrapper" }
-attributes #7 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-invoke"="reflect/methods.Print(string)" "tinygo-methods"="reflect/methods.Print(string)" }
+attributes #7 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-invoke"="reflect/methods.Print(string)" "tinygo-methods"="reflect/methods.Print(string)" }
-attributes #8 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-gowrapper"="interface:{Print:func:{basic:string}{}}.Print$invoke" }
+attributes #8 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-gowrapper"="interface:{Print:func:{basic:string}{}}.Print$invoke" }
 attributes #9 = { nounwind }

compiler/testdata/interface.ll

@@ -130,11 +130,11 @@ entry:
 
 declare %runtime._string @"interface:{Error:func:{}{basic:string}}.Error$invoke"(ptr, ptr, ptr) #6
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #3 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-methods"="reflect/methods.Error() string" }
+attributes #3 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-methods"="reflect/methods.Error() string" }
-attributes #4 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-methods"="reflect/methods.String() string" }
+attributes #4 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-methods"="reflect/methods.String() string" }
-attributes #5 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-invoke"="main.$methods.foo(int) uint8" "tinygo-methods"="reflect/methods.String() string; main.$methods.foo(int) uint8" }
+attributes #5 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-invoke"="main.$methods.foo(int) uint8" "tinygo-methods"="reflect/methods.String() string; main.$methods.foo(int) uint8" }
-attributes #6 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "tinygo-invoke"="reflect/methods.Error() string" "tinygo-methods"="reflect/methods.Error() string" }
+attributes #6 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "tinygo-invoke"="reflect/methods.Error() string" "tinygo-methods"="reflect/methods.Error() string" }
 attributes #7 = { nounwind }

compiler/testdata/pointer.ll

@@ -44,7 +44,7 @@ entry:
   ret ptr %x
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nounwind }

compiler/testdata/pragma.ll

@@ -93,13 +93,13 @@ entry:
   ret void
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #3 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "wasm-export-name"="extern_func" }
+attributes #3 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "wasm-export-name"="extern_func" }
-attributes #4 = { inlinehint nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #4 = { inlinehint nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #5 = { noinline nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #5 = { noinline nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #6 = { noinline nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "wasm-export-name"="exportedFunctionInSection" }
+attributes #6 = { noinline nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "wasm-export-name"="exportedFunctionInSection" }
-attributes #7 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "wasm-import-module"="modulename" "wasm-import-name"="import1" }
+attributes #7 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "wasm-import-module"="modulename" "wasm-import-name"="import1" }
-attributes #8 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "wasm-import-module"="foobar" "wasm-import-name"="imported" }
+attributes #8 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "wasm-import-module"="foobar" "wasm-import-name"="imported" }
-attributes #9 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" "wasm-export-name"="exported" }
+attributes #9 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" "wasm-export-name"="exported" }

compiler/testdata/slice.ll

@@ -322,7 +322,7 @@ unsafe.Slice.throw:                               ; preds = %entry
   unreachable
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #3 = { nounwind }

compiler/testdata/string.ll

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

compiler/testdata/zeromap.ll

@@ -132,9 +132,9 @@ entry:
   ret void
 }
 
-attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #0 = { allockind("alloc,zeroed") allocsize(0) "alloc-family"="runtime.alloc" "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #1 = { "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #2 = { nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
-attributes #3 = { noinline nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+call-indirect-overlong,+mutable-globals,+nontrapping-fptoint,+sign-ext,-multivalue,-reference-types" }
+attributes #3 = { noinline nounwind "target-features"="+bulk-memory,+bulk-memory-opt,+mutable-globals,+nontrapping-fptoint,+sign-ext,-call-indirect-overlong,-multivalue,-reference-types" }
 attributes #4 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 attributes #5 = { nounwind }

go.mod

@@ -5,6 +5,8 @@ go 1.22.0
 require (
 	github.com/aykevl/go-wasm v0.0.2-0.20250317121156-42b86c494139
 	github.com/blakesmith/ar v0.0.0-20150311145944-8bd4349a67f2
+	github.com/chromedp/cdproto v0.0.0-20220113222801-0725d94bb6ee
+	github.com/chromedp/chromedp v0.7.6
 	github.com/gofrs/flock v0.8.1
 	github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf
 	github.com/inhies/go-bytesize v0.0.0-20220417184213-4913239db9cf
@@ -22,7 +24,13 @@ require (
 )
 
 require (
+	github.com/chromedp/sysutil v1.0.0 // indirect
 	github.com/creack/goselect v0.1.2 // indirect
+	github.com/gobwas/httphead v0.1.0 // indirect
+	github.com/gobwas/pool v0.2.1 // indirect
+	github.com/gobwas/ws v1.1.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/stretchr/testify v1.8.4 // indirect
 	golang.org/x/text v0.22.0 // indirect

go.sum

@@ -2,16 +2,33 @@ github.com/aykevl/go-wasm v0.0.2-0.20250317121156-42b86c494139 h1:2O/WuAt8J5id3k
 github.com/aykevl/go-wasm v0.0.2-0.20250317121156-42b86c494139/go.mod h1:7sXyiaA0WtSogCu67R2252fQpVmJMh9JWJ9ddtGkpWw=
 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 v0.0.0-20211126220118-81fa0469ad77/go.mod h1:At5TxYYdxkbQL0TSefRjhLE3Q0lgvqKKMSFUglJ7i1U=
+github.com/chromedp/cdproto v0.0.0-20220113222801-0725d94bb6ee h1:+SFdIVfQpG0s0DHYzou0kgfE0n0ZjKPwbiRJsXrZegU=
+github.com/chromedp/cdproto v0.0.0-20220113222801-0725d94bb6ee/go.mod h1:At5TxYYdxkbQL0TSefRjhLE3Q0lgvqKKMSFUglJ7i1U=
+github.com/chromedp/chromedp v0.7.6 h1:2juGaktzjwULlsn+DnvIZXFUckEp5xs+GOBroaea+jA=
+github.com/chromedp/chromedp v0.7.6/go.mod h1:ayT4YU/MGAALNfOg9gNrpGSAdnU51PMx+FCeuT1iXzo=
+github.com/chromedp/sysutil v1.0.0 h1:+ZxhTpfpZlmchB58ih/LBHX52ky7w2VhQVKQMucy3Ic=
+github.com/chromedp/sysutil v1.0.0/go.mod h1:kgWmDdq8fTzXYcKIBqIYvRRTnYb9aNS9moAV0xufSww=
 github.com/creack/goselect v0.1.2 h1:2DNy14+JPjRBgPzAd1thbQp4BSIihxcBf0IXhQXDRa0=
 github.com/creack/goselect v0.1.2/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gobwas/httphead v0.1.0 h1:exrUm0f4YX0L7EBwZHuCF4GDp8aJfVeBrlLQrs6NqWU=
+github.com/gobwas/httphead v0.1.0/go.mod h1:O/RXo79gxV8G+RqlR/otEwx4Q36zl9rqC5u12GKvMCM=
+github.com/gobwas/pool v0.2.1 h1:xfeeEhW7pwmX8nuLVlqbzVc7udMDrwetjEv+TZIz1og=
+github.com/gobwas/pool v0.2.1/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6WezmKEw=
+github.com/gobwas/ws v1.1.0 h1:7RFti/xnNkMJnrK7D1yQ/iCIB5OrrY/54/H930kIbHA=
+github.com/gobwas/ws v1.1.0/go.mod h1:nzvNcVha5eUziGrbxFCo6qFIojQHjJV5cLYIbezhfL0=
 github.com/gofrs/flock v0.8.1 h1:+gYjHKf32LDeiEEFhQaotPbLuUXjY5ZqxKgXy7n59aw=
 github.com/gofrs/flock v0.8.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14jxHU=
 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/inhies/go-bytesize v0.0.0-20220417184213-4913239db9cf h1:FtEj8sfIcaaBfAKrE1Cwb61YDtYq9JxChK1c7AKce7s=
 github.com/inhies/go-bytesize v0.0.0-20220417184213-4913239db9cf/go.mod h1:yrqSXGoD/4EKfF26AOGzscPOgTTJcyAwM2rpixWT+t4=
+github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
+github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
+github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
+github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
 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/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
@@ -25,6 +42,8 @@ github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D
 github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mattn/go-tty v0.0.4 h1:NVikla9X8MN0SQAqCYzpGyXv0jY7MNl3HOWD2dkle7E=
 github.com/mattn/go-tty v0.0.4/go.mod h1:u5GGXBtZU6RQoKV8gY5W6UhMudbR5vXnUe7j3pxse28=
+github.com/orisano/pixelmatch v0.0.0-20210112091706-4fa4c7ba91d5 h1:1SoBaSPudixRecmlHXb/GxmaD3fLMtHIDN13QujwQuc=
+github.com/orisano/pixelmatch v0.0.0-20210112091706-4fa4c7ba91d5/go.mod h1:nZgzbfBr3hhjoZnS66nKrHmduYNpc34ny7RK4z5/HM0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3 h1:aQKxg3+2p+IFXXg97McgDGT5zcMrQoi0EICZs8Pgchs=
@@ -44,6 +63,8 @@ golang.org/x/sync v0.11.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201207223542-d4d67f95c62d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20211124211545-fe61309f8881/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=

goenv/version.go

@@ -10,7 +10,7 @@ import (
 
 // Version of TinyGo.
 // Update this value before release of new version of software.
-const version = "0.40.0-dev"
+const version = "0.39.0-dev"
 
 // Return TinyGo version, either in the form 0.30.0 or as a development version
 // (like 0.30.0-dev-abcd012).

interp/interpreter.go

@@ -577,7 +577,7 @@ func (r *runner) run(fn *function, params []value, parentMem *memoryView, indent
 						// runtime instead of at compile time. But we need to
 						// revert any changes made by the call first.
 						if r.debug {
-							fmt.Fprintln(os.Stderr, indent+"!! revert because of error:", callErr.Error())
+							fmt.Fprintln(os.Stderr, indent+"!! revert because of error:", callErr.Err)
 						}
 						callMem.revert()
 						err := r.runAtRuntime(fn, inst, locals, &mem, indent)

loader/goroot.go

@@ -256,6 +256,7 @@ func pathsToOverride(goMinor int, needsSyscallPackage bool) map[string]bool {
 		"reflect/":                    false,
 		"runtime/":                    false,
 		"sync/":                       true,
+		"testing/":                    true,
 		"tinygo/":                     false,
 		"unique/":                     false,
 	}

main.go

@@ -291,8 +291,7 @@ func Test(pkgName string, stdout, stderr io.Writer, options *compileopts.Options
 	})
 
 	if testConfig.CompileOnly {
-		// Return the compiler error, if there is one.
+		return true, nil
-		return true, err
 	}
 
 	importPath := strings.TrimSuffix(result.ImportPath, ".test")
@@ -340,17 +339,8 @@ func dirsToModuleRootAbs(maindir, modroot string) []string {
 	return dirs
 }
 
-// validateOutputFormat checks if the output file extension matches the expected format
-func validateOutputFormat(outpath, expectedExt string) error {
-	actualExt := filepath.Ext(outpath)
-	if actualExt != expectedExt {
-		return fmt.Errorf("output format %s does not match target format %s", actualExt, expectedExt)
-	}
-	return nil
-}
-
 // Flash builds and flashes the built binary to the given serial port.
-func Flash(pkgName, port, outpath string, options *compileopts.Options) error {
+func Flash(pkgName, port string, options *compileopts.Options) error {
 	config, err := builder.NewConfig(options)
 	if err != nil {
 		return err
@@ -399,24 +389,13 @@ func Flash(pkgName, port, outpath string, options *compileopts.Options) error {
 	if !options.Work {
 		defer os.RemoveAll(tmpdir)
 	}
-	// Validate output format before building
+
-	if outpath != "" {
-		if err := validateOutputFormat(outpath, fileExt); err != nil {
-			return err
-		}
-	}
 	// Build the binary.
 	result, err := builder.Build(pkgName, fileExt, tmpdir, config)
 	if err != nil {
 		return err
 	}
 
-	// Save output file if specified (after build, before flashing)
-	if outpath != "" {
-		if err := copyFile(result.Binary, outpath); err != nil {
-			return fmt.Errorf("failed to save output file: %v", err)
-		}
-	}
 	// do we need port reset to put MCU into bootloader mode?
 	if config.Target.PortReset == "true" && flashMethod != "openocd" {
 		port, err := getDefaultPort(port, config.Target.SerialPort)
@@ -1318,11 +1297,6 @@ extension at all.`
 			(https://tinygo.org/docs/reference/microcontrollers/).
 			Examples: "arduino-nano", "d1mini", "xiao".
 
-	-o={filename}:
-			Save the built binary to the specified output file. The file
-			format must match the target's expected format (e.g., .hex,
-			.uf2). Both flashing and saving will be performed.
-
 	-monitor: 
 			Start the serial monitor (see below) immediately after
 			flashing. However, some microcontrollers need a split second
@@ -1653,7 +1627,7 @@ func main() {
 		flag.BoolVar(&flagTest, "test", false, "supply -test flag to go list")
 	}
 	var outpath string
-	if command == "help" || command == "build" || command == "test" || command == "flash" {
+	if command == "help" || command == "build" || command == "test" {
 		flag.StringVar(&outpath, "o", "", "output filename")
 	}
 
@@ -1804,7 +1778,7 @@ func main() {
 	case "flash", "gdb", "lldb":
 		pkgName := filepath.ToSlash(flag.Arg(0))
 		if command == "flash" {
-			err := Flash(pkgName, *port, outpath, options)
+			err := Flash(pkgName, *port, options)
 			printBuildOutput(err, *flagJSON)
 		} else {
 			if !options.Debug {
@@ -1890,7 +1864,6 @@ func main() {
 						wd = ""
 					}
 					diagnostics.CreateDiagnostics(err).WriteTo(os.Stderr, wd)
-					os.Exit(1)
 				}
 				if !passed {
 					select {

monitor.go

@@ -35,8 +35,8 @@ func Monitor(executable, port string, config *compileopts.Config) error {
 		// Use the RTT interface, which is documented (in part) here:
 		// https://wiki.segger.com/RTT
 
-		// Try to find the "_SEGGER_RTT" symbol (machine.rttSerialInstance)
+		// Try to find the "machine.rttSerialInstance" symbol, which is the RTT
-		// symbol, which is the RTT control block.
+		// control block.
 		file, err := elf.Open(executable)
 		if err != nil {
 			return fmt.Errorf("could not open ELF file to determine RTT control block: %w", err)
@@ -48,7 +48,7 @@ func Monitor(executable, port string, config *compileopts.Config) error {
 		}
 		var address uint64
 		for _, symbol := range symbols {
-			if symbol.Name == "_SEGGER_RTT" {
+			if symbol.Name == "machine.rttSerialInstance" {
 				address = symbol.Value
 				break
 			}

src/crypto/x509/internal/macos/macos.go

@@ -63,10 +63,6 @@ func SecCertificateCopyData(cert CFRef) ([]byte, error) {
 	return nil, errors.New("not implemented")
 }
 
-func SecTrustCopyCertificateChain(trustObj CFRef) (CFRef, error) {
-	return 0, errors.New("not implemented")
-}
-
 func SecTrustEvaluateWithError(trustObj CFRef) (int, error) {
 	return 0, errors.New("not implemented")
 }

src/device/arm/arm.go

@@ -48,10 +48,10 @@ func Asm(asm string)
 // recognizes template values in the form {name}, like so:
 //
 //	arm.AsmFull(
-//	    "str {value}, [{result}]",
+//	    "str {value}, {result}",
 //	    map[string]interface{}{
-//	        "value":  1,
+//	        "value":  1
-//	        "result": uintptr(unsafe.Pointer(&dest)),
+//	        "result": &dest,
 //	    })
 //
 // You can use {} in the asm string (which expands to a register) to set the

src/device/arm/cortexm.S

@@ -1,6 +1,29 @@
 .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.
+    mov r0, sp
+
+    // Load the default stack pointer from address 0 so that we can call normal
+    // functions again that expect a working stack. However, it will corrupt the
+    // old stack so the function below must not attempt to recover from this
+    // fault.
+    movs r3, #0
+    ldr r3, [r3]
+    mov sp, r3
+
+    // 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.
 .section .text.SemihostingCall

src/device/arm64/arm64.go

@@ -10,10 +10,10 @@ func Asm(asm string)
 // recognizes template values in the form {name}, like so:
 //
 //	arm.AsmFull(
-//	    "str {value}, [{result}]",
+//	    "str {value}, {result}",
 //	    map[string]interface{}{
-//	        "value":  1,
+//	        "value":  1
-//	        "result": uintptr(unsafe.Pointer(&dest)),
+//	        "result": &dest,
 //	    })
 //
 // You can use {} in the asm string (which expands to a register) to set the

src/device/asm.go

@@ -10,10 +10,10 @@ func Asm(asm string)
 // recognizes template values in the form {name}, like so:
 //
 //	arm.AsmFull(
-//	    "str {value}, [{result}]",
+//	    "str {value}, {result}",
 //	    map[string]interface{}{
-//	        "value":  1,
+//	        "value":  1
-//	        "result": uintptr(unsafe.Pointer(&dest)),
+//	        "result": &dest,
 //	    })
 //
 // You can use {} in the asm string (which expands to a register) to set the

src/device/riscv/riscv.go

@@ -10,10 +10,10 @@ func Asm(asm string)
 // recognizes template values in the form {name}, like so:
 //
 //	arm.AsmFull(
-//	    "st {value}, [{result}]",
+//	    "st {value}, {result}",
 //	    map[string]interface{}{
-//	        "value":  1,
+//	        "value":  1
-//	        "result": uintptr(unsafe.Pointer(&dest)),
+//	        "result": &dest,
 //	    })
 //
 // You can use {} in the asm string (which expands to a register) to set the

src/internal/abi/escape.go

@@ -8,10 +8,3 @@ import "unsafe"
 func NoEscape(p unsafe.Pointer) unsafe.Pointer {
 	return p
 }
-
-func Escape[T any](x T) T {
-	// This function is either implemented in the compiler, or left undefined
-	// for some variation of T. The body of this function should not be compiled
-	// as-is.
-	panic("internal/abi.Escape: unreachable (implemented in the compiler)")
-}

src/internal/task/task_threads.c

@@ -58,7 +58,6 @@ void tinygo_task_init(void *mainTask, pthread_t *thread, int *numCPU, void *cont
     // Using pthread_kill, we can still send the signal to a specific thread.
     struct sigaction act = { 0 };
     act.sa_handler = tinygo_task_gc_pause;
-    act.sa_flags = SA_RESTART;
     sigaction(taskPauseSignal, &act, NULL);
 
     // Obtain the number of CPUs available on program start (for NumCPU).
@@ -101,7 +100,7 @@ static void* start_wrapper(void *arg) {
 };
 
 // Start a new goroutine in an OS thread.
-int tinygo_task_start(uintptr_t fn, void *args, void *task, pthread_t *thread, uintptr_t *stackTop, uintptr_t stackSize, void *context) {
+int tinygo_task_start(uintptr_t fn, void *args, void *task, pthread_t *thread, uintptr_t *stackTop, void *context) {
     // Sanity check. Should get optimized away.
     if (sizeof(pthread_t) != sizeof(void*)) {
         __builtin_trap();
@@ -118,11 +117,7 @@ int tinygo_task_start(uintptr_t fn, void *args, void *task, pthread_t *thread, u
     #else
     sem_init(&state.startlock, 0, 0);
     #endif
-    pthread_attr_t attrs;
+    int result = pthread_create(thread, NULL, &start_wrapper, &state);
-    pthread_attr_init(&attrs);
-    pthread_attr_setstacksize(&attrs, stackSize);
-    int result = pthread_create(thread, &attrs, &start_wrapper, &state);
-    pthread_attr_destroy(&attrs);
 
     // Wait until the thread has been created and read all state_pass variables.
     #if __APPLE__

src/internal/task/task_threads.go

@@ -109,7 +109,7 @@ func start(fn uintptr, args unsafe.Pointer, stackSize uintptr) {
 	// and the stop-the-world GC won't see threads that haven't started yet or
 	// are not fully started yet.
 	activeTaskLock.Lock()
-	errCode := tinygo_task_start(fn, args, t, &t.state.thread, &t.state.stackTop, stackSize)
+	errCode := tinygo_task_start(fn, args, t, &t.state.thread, &t.state.stackTop)
 	if errCode != 0 {
 		runtimePanic("could not start thread")
 	}
@@ -266,7 +266,7 @@ func tinygo_task_init(t *Task, thread *threadID, numCPU *int32)
 // Here same as for tinygo_task_init.
 //
 //go:linkname tinygo_task_start tinygo_task_start
-func tinygo_task_start(fn uintptr, args unsafe.Pointer, t *Task, thread *threadID, stackTop *uintptr, stackSize uintptr) int32
+func tinygo_task_start(fn uintptr, args unsafe.Pointer, t *Task, thread *threadID, stackTop *uintptr) int32
 
 // Pause the thread by sending it a signal.
 //

src/machine/board_fe310.go

@@ -15,8 +15,8 @@ const (
 	P09 Pin = 9
 	P10 Pin = 10
 	P11 Pin = 11
-	P12 Pin = 12 // peripherals: I2C0 SDA
+	P12 Pin = 12
-	P13 Pin = 13 // peripherals: I2C0 SCL
+	P13 Pin = 13
 	P14 Pin = 14
 	P15 Pin = 15
 	P16 Pin = 16

src/machine/board_gopher-arcade.go

@@ -1,22 +0,0 @@
-//go:build gopher_arcade
-
-package machine
-
-// Return the current CPU frequency in hertz.
-func CPUFrequency() uint32 {
-	return 8000000
-}
-
-const (
-	P5 Pin = PB0
-	P6 Pin = PB1
-	P7 Pin = PB2
-	P2 Pin = PB3
-	P3 Pin = PB4
-	P1 Pin = PB5
-
-	LED          = P1
-	BUTTON_LEFT  = P7
-	BUTTON_RIGHT = P5
-	SPEAKER      = P6
-)

src/machine/board_metro_rp2350.go

@@ -1,183 +0,0 @@
-//go:build metro_rp2350
-
-package machine
-
-// GPIO pins
-const (
-	GP0  Pin = GPIO0
-	GP1  Pin = GPIO1
-	GP2  Pin = GPIO2
-	GP3  Pin = GPIO3
-	GP4  Pin = GPIO4
-	GP5  Pin = GPIO5
-	GP6  Pin = GPIO6
-	GP7  Pin = GPIO7
-	GP8  Pin = GPIO8
-	GP9  Pin = GPIO9
-	GP10 Pin = GPIO10
-	GP11 Pin = GPIO11
-	GP12 Pin = GPIO12
-	GP13 Pin = GPIO13
-	GP14 Pin = GPIO14
-	GP15 Pin = GPIO15
-	GP16 Pin = GPIO16
-	GP17 Pin = GPIO17
-	GP18 Pin = GPIO18
-	GP19 Pin = GPIO19
-	GP20 Pin = GPIO20
-	GP21 Pin = GPIO21
-	GP22 Pin = GPIO22
-	GP23 Pin = GPIO23
-	GP24 Pin = GPIO24
-	GP25 Pin = GPIO25
-	GP26 Pin = GPIO26
-	GP27 Pin = GPIO27
-	GP28 Pin = GPIO28
-	GP29 Pin = GPIO29
-	GP30 Pin = GPIO30
-	GP31 Pin = GPIO31
-	GP32 Pin = GPIO32
-	GP33 Pin = GPIO33
-	GP34 Pin = GPIO34
-	GP35 Pin = GPIO35
-	GP36 Pin = GPIO36
-	GP37 Pin = GPIO37
-	GP38 Pin = GPIO38
-	GP39 Pin = GPIO39
-	GP40 Pin = GPIO40
-	GP41 Pin = GPIO41
-	GP42 Pin = GPIO42
-	GP43 Pin = GPIO43
-	GP44 Pin = GPIO44
-	GP45 Pin = GPIO45
-	GP46 Pin = GPIO46
-
-	// Boot button
-	BUTTON Pin = GPIO24
-
-	// Onboard LED
-	LED Pin = GPIO23
-
-	// Onboard NeoPixel
-	NEOPIXEL Pin = GPIO25
-	WS2812   Pin = GPIO25
-
-	// Onboard crystal oscillator frequency, in MHz.
-	xoscFreq = 12 // MHz
-)
-
-// Arduino-header digital pins
-const (
-	RX  Pin = GPIO1
-	TX  Pin = GPIO0
-	D2  Pin = GPIO2
-	D3  Pin = GPIO3
-	D4  Pin = GPIO4
-	D5  Pin = GPIO5
-	D6  Pin = GPIO6
-	D7  Pin = GPIO7
-	D8  Pin = GPIO8
-	D9  Pin = GPIO9
-	D10 Pin = GPIO10
-	D11 Pin = GPIO11
-	D22 Pin = GPIO22
-	D23 Pin = GPIO23
-)
-
-// Arduino-header analog pins
-const (
-	A0 Pin = GPIO41
-	A1 Pin = GPIO42
-	A2 Pin = GPIO43
-	A3 Pin = GPIO44
-	A4 Pin = GPIO45
-	A5 Pin = GPIO46
-)
-
-// I2C Default pins on Raspberry Pico.
-const (
-	I2C0_SDA_PIN = GP20
-	I2C0_SCL_PIN = GP21
-
-	I2C1_SDA_PIN = GP2
-	I2C1_SCL_PIN = GP3
-)
-
-// SPI default pins
-const (
-	// Default Serial Clock Bus 0 for SPI communications
-	SPI0_SCK_PIN = GPIO18
-	// Default Serial Out Bus 0 for SPI communications
-	SPI0_SDO_PIN = GPIO19 // Tx
-	// Default Serial In Bus 0 for SPI communications
-	SPI0_SDI_PIN = GPIO16 // Rx
-
-	// Default Serial Clock Bus 1 for SPI communications
-	SPI1_SCK_PIN = GPIO30
-	// Default Serial Out Bus 1 for SPI communications
-	SPI1_SDO_PIN = GPIO31 // Tx
-	// Default Serial In Bus 1 for SPI communications
-	SPI1_SDI_PIN = GPIO28 // Rx
-
-	// SPI header pins
-	MOSI Pin = SPI1_SDO_PIN
-	MISO Pin = SPI1_SDI_PIN
-	SCK  Pin = SPI1_SCK_PIN
-)
-
-// SD card reader pins
-const (
-	SD_SCK         = GPIO34
-	SD_MOSI        = GPIO35
-	SD_MISO        = GPIO36
-	SDIO_DATA1     = GPIO37
-	SDIO_DATA2     = GPIO38
-	SD_CS          = GPIO39
-	SD_CARD_DETECT = GPIO40
-)
-
-// HSTX pins
-const (
-	CKN Pin = GPIO15
-	CKP Pin = GPIO14
-	D0N Pin = GPIO19
-	D0P Pin = GPIO18
-	D1N Pin = GPIO17
-	D1P Pin = GPIO16
-	D2N Pin = GPIO13
-	D2P Pin = GPIO12
-	D26 Pin = GPIO26
-	D27 Pin = GPIO27
-	SCL Pin = GPIO21
-	SDA Pin = GPIO20
-)
-
-// USB host header pins
-const (
-	USB_HOST_DATA_PLUS  Pin = GPIO32
-	USB_HOST_DATA_MINUS Pin = GPIO33
-	USB_HOST_5V_POWER   Pin = GPIO29
-)
-
-// UART pins
-const (
-	UART0_TX_PIN = GPIO0
-	UART0_RX_PIN = GPIO1
-	UART1_TX_PIN = GPIO8
-	UART1_RX_PIN = GPIO9
-	UART_TX_PIN  = UART0_TX_PIN
-	UART_RX_PIN  = UART0_RX_PIN
-)
-
-var DefaultUART = UART0
-
-// USB identifiers
-const (
-	usb_STRING_PRODUCT      = "Metro RP2350"
-	usb_STRING_MANUFACTURER = "Adafruit"
-)
-
-var (
-	usb_VID uint16 = 0x239A
-	usb_PID uint16 = 0x814E
-)

src/machine/machine_nrf528xx.go

@@ -78,14 +78,14 @@ func (i2c *I2C) Tx(addr uint16, w, r []byte) (err error) {
 		// Allow scheduler to run
 		gosched()
 
-		// Handle first occurrence of error by ensuring STOP sent on bus
+		// Handle errors by ensuring STOP sent on bus
-		if err == nil && i2c.Bus.EVENTS_ERROR.Get() != 0 {
+		if i2c.Bus.EVENTS_ERROR.Get() != 0 {
-			err = twiCError(i2c.Bus.ERRORSRC.Get())
 			if i2c.Bus.EVENTS_STOPPED.Get() == 0 {
 				// STOP cannot be sent during SUSPEND
 				i2c.Bus.TASKS_RESUME.Set(1)
 				i2c.Bus.TASKS_STOP.Set(1)
 			}
+			err = twiCError(i2c.Bus.ERRORSRC.Get())
 		}
 	}
 

src/machine/machine_rp2.go

@@ -58,10 +58,6 @@ func machineInit() {
 
 	// Peripheral clocks should now all be running
 	unresetBlockWait(RESETS_RESET_Msk)
-
-	// DBGPAUSE pauses the timer when a debugger is connected. This prevents
-	// sleep functions from ever returning, so disable it.
-	timer.setDbgPause(false)
 }
 
 //go:linkname ticks runtime.machineTicks

src/machine/machine_rp2_adc.go

@@ -100,8 +100,7 @@ func ReadTemperature() (millicelsius int32) {
 	rp.ADC.CS.SetBits(rp.ADC_CS_TS_EN)
 
 	// T = 27 - (ADC_voltage - 0.706)/0.001721
-	// 1/0.001721 ≈ 581
+	return (27000<<16 - (int32(thermChan.getVoltage())-706<<16)*581) >> 16
-	return int32(((int64(27000) << 16) - ((int64(thermChan.getVoltage()) - (int64(706) << 16)) * 581)) >> 16)
 }
 
 // waitForReady spins waiting for the ADC peripheral to become ready.

src/machine/machine_rp2_timer.go

@@ -101,15 +101,3 @@ func (tmr *timerType) lightSleep(us uint64) {
 	// Disable interrupt
 	intr.Disable()
 }
-
-// setDbgPause sets whether this timer is paused when a debugger is connected.
-func (tmr *timerType) setDbgPause(enable bool) {
-	const bitPos = 1
-	const bitMask = 0b11
-	val := uint32(0b00)
-	if enable {
-		// Disable timer when debugger is connected to either core.
-		val = 0b11
-	}
-	tmr.dbgPause.ReplaceBits(val, bitMask, bitPos)
-}

src/machine/machine_rp2_uart.go

@@ -104,9 +104,7 @@ func (uart *UART) SetBaudRate(br uint32) {
 func (uart *UART) writeByte(c byte) error {
 	// wait until buffer is not full
 	for uart.Bus.UARTFR.HasBits(rp.UART0_UARTFR_TXFF) {
-		if !interrupt.In() {
+		gosched()
-			gosched()
-		}
 	}
 
 	// write data
@@ -116,9 +114,7 @@ func (uart *UART) writeByte(c byte) error {
 
 func (uart *UART) flush() {
 	for uart.Bus.UARTFR.HasBits(rp.UART0_UARTFR_BUSY) {
-		if !interrupt.In() {
+		gosched()
-			gosched()
-		}
 	}
 }
 

src/machine/serial-rtt.go

@@ -16,8 +16,6 @@ import (
 )
 
 // This symbol name is known by the compiler, see monitor.go.
-//
-//go:linkname rttSerialInstance _SEGGER_RTT
 var rttSerialInstance rttSerial
 
 var Serial = &rttSerialInstance

src/os/file_unix.go

@@ -12,6 +12,7 @@ package os
 import (
 	"io"
 	"syscall"
+	_ "unsafe"
 )
 
 const DevNull = "/dev/null"

src/reflect/type.go

@@ -127,11 +127,6 @@ type Method struct {
 	Index int   // index for Type.Method
 }
 
-// IsExported reports whether the method is exported.
-func (m Method) IsExported() bool {
-	return m.PkgPath == ""
-}
-
 // The following Type type has been copied almost entirely from
 // https://github.com/golang/go/blob/go1.15/src/reflect/type.go#L27-L212.
 // Some methods have been commented out as they haven't yet been implemented.

src/reflect/value.go

@@ -81,8 +81,8 @@ func (it *MapIter) Next() bool {
 	return ((*reflectlite.MapIter)(it)).Next()
 }
 
-func (it *MapIter) Reset(v Value) {
+func (iter *MapIter) Reset(v Value) {
-	(*reflectlite.MapIter)(it).Reset(v.Value)
+	(*reflectlite.MapIter)(iter).Reset(v.Value)
 }
 
 func (v Value) Set(x Value) {

src/runtime/debug/garbage.go

@@ -30,9 +30,7 @@ func SetPanicOnFault(enabled bool) bool {
 
 func WriteHeapDump(fd uintptr)
 
-// Unimplemented.
+func SetTraceback(level string)
-func SetTraceback(level string) {
-}
 
 func SetMemoryLimit(limit int64) int64 {
 	return limit

src/runtime/extern.go

@@ -1,11 +1,6 @@
 package runtime
 
 func Callers(skip int, pc []uintptr) int {
-	if len(pc) > 0 {
-		// The testing package expects at least one caller in all cases.
-		pc[0] = 0
-		return 1
-	}
 	return 0
 }
 

src/runtime/panic.go

@@ -93,9 +93,6 @@ func runtimePanicAt(addr unsafe.Pointer, msg string) {
 		trap()
 	}
 	if hasReturnAddr {
-		// Note: the string "panic: runtime error at " is also used in
-		// runtime_cortexm_hardfault.go. It is kept the same so that the string
-		// can be deduplicated by the compiler.
 		printstring("panic: runtime error at ")
 		printptr(uintptr(addr) - callInstSize)
 		printstring(": ")

src/runtime/rand.go

@@ -1,11 +0,0 @@
-package runtime
-
-import _ "unsafe"
-
-// TODO: Use hardware when available
-//
-//go:linkname vgetrandom
-func vgetrandom(p []byte, flags uint32) (ret int, supported bool) { return 0, false }
-
-//go:linkname fatal crypto/internal/sysrand.fatal
-func fatal(msg string) { runtimePanic(msg) }

src/runtime/runtime.go

@@ -57,12 +57,6 @@ func memzero(ptr unsafe.Pointer, size uintptr)
 // the current stack pointer in a platform-independent way.
 func stacksave() unsafe.Pointer
 
-// Special LLVM intrinsic that returns the SP register on entry to the calling
-// function.
-//
-//export llvm.sponentry.p0
-func llvm_sponentry() unsafe.Pointer
-
 //export strlen
 func strlen(ptr unsafe.Pointer) uintptr
 
@@ -112,33 +106,6 @@ func UnlockOSThread() {
 // point of the call.
 func KeepAlive(x interface{})
 
-// AddCleanup is a dummy cleanup implementation. It doesn't do any cleaning up.
-//
-// We base this on the following loophole in the official runtime.AddCleanup
-// documentation:
-//
-// > The cleanup(arg) call is not always guaranteed to run; in particular it is
-// > not guaranteed to run before program exit.
-//
-// So it's technically correct (the best kind of correct) to not run any
-// cleanups. But of course, this can lead to resource leaks so cleanups may need
-// to be implemented eventually.
-func AddCleanup[T, S any](ptr *T, cleanup func(S), arg S) Cleanup {
-	return Cleanup{}
-}
-
-type Cleanup struct{}
-
-func (c Cleanup) Stop() {}
-
-//go:linkname registerWeakPointer weak.runtime_registerWeakPointer
-func registerWeakPointer(ptr unsafe.Pointer) unsafe.Pointer {
-	// TODO: unimplemented.
-	// I hope not implementing this won't break anything, like packages that
-	// expect weak pointers to be GC'd before they actually are.
-	return ptr
-}
-
 var godebugUpdate func(string, string)
 
 //go:linkname godebug_setUpdate internal/godebug.setUpdate
@@ -181,19 +148,3 @@ func getAuxv() []uintptr {
 func cgo_errno() uintptr {
 	return uintptr(*libc_errno_location())
 }
-
-// Unimplemented.
-var MemProfileRate int = 0
-
-// Unimplemented.
-func SetBlockProfileRate(rate int) {
-}
-
-var mutexProfileFraction int
-
-// Unimplemented.
-func SetMutexProfileFraction(rate int) int {
-	previous := mutexProfileFraction
-	mutexProfileFraction = rate
-	return previous
-}

src/runtime/runtime_cortexm_hardfault.go

@@ -2,25 +2,39 @@
 
 package runtime
 
+import (
+	"unsafe"
+)
+
 // This function is called at HardFault.
+// Before this function is called, the stack pointer is reset to the initial
+// stack pointer (loaded from address 0x0) and the previous stack pointer is
+// passed as an argument to this function. This allows for easy inspection of
+// the stack the moment a HardFault occurs, but it means that the stack will be
+// corrupted by this function and thus this handler must not attempt to recover.
 //
 // For details, see:
 // https://community.arm.com/developer/ip-products/system/f/embedded-forum/3257/debugging-a-cortex-m0-hard-fault
 // https://blog.feabhas.com/2013/02/developing-a-generic-hard-fault-handler-for-arm-cortex-m3cortex-m4/
 //
-//export HardFault_Handler
+//export handleHardFault
-func HardFault_Handler() {
+func handleHardFault(sp *interruptStack) {
-	// Obtain the stack pointer as it was on entry to the HardFault. It contains
+	print("fatal error: ")
-	// the registers that were pushed by the NVIC and that we can now read back
+	if uintptr(unsafe.Pointer(sp)) < 0x20000000 {
-	// to print the PC value at the time of the hard fault, for example.
+		print("stack overflow")
-	sp := (*interruptStack)(llvm_sponentry())
+	} else {
-
+		// TODO: try to find the cause of the hard fault. Especially on
-	// Note: by reusing the string "panic: runtime error at " we save a little
+		// Cortex-M3 and higher it is possible to find more detailed information
-	// bit in terms of code size as the string can be deduplicated.
+		// in special status registers.
-	print("panic: runtime error at ", sp.PC, ": HardFault with sp=", sp)
+		print("HardFault")
-	// TODO: try to find the cause of the hard fault. Especially on Cortex-M3
+	}
-	// and higher it is possible to find more detailed information in special
+	print(" with sp=", sp)
-	// status registers.
+	if uintptr(unsafe.Pointer(&sp.PC)) >= 0x20000000 {
+		// Only print the PC if it points into memory.
+		// It may not point into memory during a stack overflow, so check that
+		// first before accessing the stack.
+		print(" pc=", sp.PC)
+	}
 	println()
 	abort()
 }

src/runtime/runtime_cortexm_hardfault_debug.go

@@ -18,13 +18,8 @@ const (
 
 // See runtime_cortexm_hardfault.go
 //
-//export HardFault_Handler
+//go:export handleHardFault
-func HardFault_Handler() {
+func handleHardFault(sp *interruptStack) {
-	// Obtain the stack pointer as it was on entry to the HardFault. It contains
-	// the registers that were pushed by the NVIC and that we can now read back
-	// to print the PC value at the time of the hard fault, for example.
-	sp := (*interruptStack)(llvm_sponentry())
-
 	fault := GetFaultStatus()
 	spValid := !fault.Bus().ImpreciseDataBusError()
 

src/runtime/runtime_rp2.go

@@ -1,380 +0,0 @@
-//go:build rp2040 || rp2350
-
-package runtime
-
-import (
-	"device/arm"
-	"device/rp"
-	"internal/task"
-	"machine"
-	"machine/usb/cdc"
-	"runtime/interrupt"
-	"runtime/volatile"
-	"unsafe"
-)
-
-const numCPU = 2
-const numSpinlocks = 32
-
-// machineTicks is provided by package machine.
-func machineTicks() uint64
-
-// machineLightSleep is provided by package machine.
-func machineLightSleep(uint64)
-
-// ticks returns the number of ticks (microseconds) elapsed since power up.
-func ticks() timeUnit {
-	t := machineTicks()
-	return timeUnit(t)
-}
-
-func ticksToNanoseconds(ticks timeUnit) int64 {
-	return int64(ticks) * 1000
-}
-
-func nanosecondsToTicks(ns int64) timeUnit {
-	return timeUnit(ns / 1000)
-}
-
-func sleepTicks(d timeUnit) {
-	if hasScheduler {
-		// With scheduler, sleepTicks may return early if an interrupt or
-		// event fires - so scheduler can schedule any go routines now
-		// eligible to run
-		machineLightSleep(uint64(d))
-		return
-	}
-
-	// Busy loop
-	sleepUntil := ticks() + d
-	for ticks() < sleepUntil {
-	}
-}
-
-// Currently sleeping core, or 0xff.
-// Must only be accessed with the scheduler lock held.
-var sleepingCore uint8 = 0xff
-
-// Return whether another core is sleeping.
-// May only be called with the scheduler lock held.
-func hasSleepingCore() bool {
-	return sleepingCore != 0xff
-}
-
-// Almost identical to sleepTicks, except that it will unlock/lock the scheduler
-// while sleeping and is interruptible by interruptSleepTicksMulticore.
-// This may only be called with the scheduler lock held.
-func sleepTicksMulticore(d timeUnit) {
-	sleepingCore = uint8(currentCPU())
-
-	// Note: interruptSleepTicksMulticore will be able to interrupt this, since
-	// it executes the "sev" instruction which would make sleepTicks return
-	// immediately without sleeping. Even if it happens while configuring the
-	// sleep operation.
-
-	schedulerLock.Unlock()
-	sleepTicks(d)
-	schedulerLock.Lock()
-
-	sleepingCore = 0xff
-}
-
-// Interrupt an ongoing call to sleepTicksMulticore on another core.
-func interruptSleepTicksMulticore(wakeup timeUnit) {
-	arm.Asm("sev")
-}
-
-// Number of cores that are currently in schedulerUnlockAndWait.
-// It is possible for both cores to be sleeping, if the program is waiting for
-// an interrupt (or is deadlocked).
-var waitingCore uint8
-
-// Put the scheduler to sleep, since there are no tasks to run.
-// This will unlock the scheduler lock, and must be called with the scheduler
-// lock held.
-func schedulerUnlockAndWait() {
-	waitingCore++
-	schedulerLock.Unlock()
-	arm.Asm("wfe")
-	schedulerLock.Lock()
-	waitingCore--
-}
-
-// Wake another core, if one is sleeping. Must be called with the scheduler lock
-// held.
-func schedulerWake() {
-	if waitingCore != 0 {
-		arm.Asm("sev")
-	}
-}
-
-// Return the current core number: 0 or 1.
-func currentCPU() uint32 {
-	return rp.SIO.CPUID.Get()
-}
-
-// Start the secondary cores for this chip.
-// On the RP2040/RP2350, there is only one other core to start.
-func startSecondaryCores() {
-	// Start the second core of the RP2040/RP2350.
-	// See sections 2.8.2 and 5.3 in the datasheets for RP2040 and RP2350 respectively.
-	seq := 0
-	for {
-		cmd := core1StartSequence[seq]
-		if cmd == 0 {
-			multicore_fifo_drain()
-			arm.Asm("sev")
-		}
-		multicore_fifo_push_blocking(cmd)
-		response := multicore_fifo_pop_blocking()
-		if cmd != response {
-			seq = 0
-			continue
-		}
-		seq = seq + 1
-		if seq >= len(core1StartSequence) {
-			break
-		}
-	}
-
-	// Enable the FIFO interrupt for the GC stop the world phase.
-	// We can only do this after we don't need the FIFO anymore for starting the
-	// second core.
-	intr := interrupt.New(sioIrqFifoProc0, func(intr interrupt.Interrupt) {
-		switch rp.SIO.FIFO_RD.Get() {
-		case 1:
-			gcInterruptHandler(0)
-		}
-	})
-	intr.Enable()
-	intr.SetPriority(0xff)
-}
-
-var core1StartSequence = [...]uint32{
-	0, 0, 1,
-	uint32(uintptr(unsafe.Pointer(&__isr_vector))),
-	uint32(uintptr(unsafe.Pointer(&stack1TopSymbol))),
-	uint32(exportedFuncPtr(runCore1)),
-}
-
-//go:extern __isr_vector
-var __isr_vector [0]uint32
-
-//go:extern _stack1_top
-var stack1TopSymbol [0]uint32
-
-// The function that is started on the second core.
-//
-//export tinygo_runCore1
-func runCore1() {
-	// Clear sticky bit that seems to have been set while starting this core.
-	rp.SIO.FIFO_ST.Set(rp.SIO_FIFO_ST_ROE)
-
-	// Enable the FIFO interrupt, mainly used for the stop-the-world phase of
-	// the GC.
-	// Use the lowest possible priority (highest priority value), so that other
-	// interrupts can still happen while the GC is running.
-	intr := interrupt.New(sioIrqFifoProc1, func(intr interrupt.Interrupt) {
-		switch rp.SIO.FIFO_RD.Get() {
-		case 1:
-			gcInterruptHandler(1)
-		}
-	})
-	intr.Enable()
-	intr.SetPriority(0xff)
-
-	// Now start running the scheduler on this core.
-	schedulerLock.Lock()
-	scheduler(false)
-	schedulerLock.Unlock()
-
-	// The main function returned.
-	exit(0)
-}
-
-// The below multicore_fifo_* functions have been translated from the Raspberry
-// Pi Pico SDK.
-
-func multicore_fifo_rvalid() bool {
-	return rp.SIO.FIFO_ST.Get()&rp.SIO_FIFO_ST_VLD != 0
-}
-
-func multicore_fifo_wready() bool {
-	return rp.SIO.FIFO_ST.Get()&rp.SIO_FIFO_ST_RDY != 0
-}
-
-func multicore_fifo_drain() {
-	for multicore_fifo_rvalid() {
-		rp.SIO.FIFO_RD.Get()
-	}
-}
-
-func multicore_fifo_push_blocking(data uint32) {
-	for !multicore_fifo_wready() {
-	}
-	rp.SIO.FIFO_WR.Set(data)
-	arm.Asm("sev")
-}
-
-func multicore_fifo_pop_blocking() uint32 {
-	for !multicore_fifo_rvalid() {
-		arm.Asm("wfe")
-	}
-
-	return rp.SIO.FIFO_RD.Get()
-}
-
-// Value used to communicate between the GC core and the other (paused) cores.
-var gcSignalWait volatile.Register8
-
-// The GC interrupted this core for the stop-the-world phase.
-// This function handles that, and only returns after the stop-the-world phase
-// ended.
-func gcInterruptHandler(hartID uint32) {
-	// Let the GC know we're ready.
-	gcScanState.Add(1)
-	arm.Asm("sev")
-
-	// Wait until we get a signal to start scanning.
-	for gcSignalWait.Get() == 0 {
-		arm.Asm("wfe")
-	}
-	gcSignalWait.Set(0)
-
-	// Scan the stack(s) of this core.
-	scanCurrentStack()
-	if !task.OnSystemStack() {
-		// Mark system stack.
-		markRoots(task.SystemStack(), coreStackTop(hartID))
-	}
-
-	// Signal we've finished scanning.
-	gcScanState.Store(1)
-	arm.Asm("sev")
-
-	// Wait until we get a signal that the stop-the-world phase has ended.
-	for gcSignalWait.Get() == 0 {
-		arm.Asm("wfe")
-	}
-	gcSignalWait.Set(0)
-
-	// Signal we received the signal and are going to exit the interrupt.
-	gcScanState.Add(1)
-	arm.Asm("sev")
-}
-
-// Pause the given core by sending it an interrupt.
-func gcPauseCore(core uint32) {
-	rp.SIO.FIFO_WR.Set(1)
-}
-
-// Signal the given core that it can resume one step.
-// This is called twice after gcPauseCore: the first time to scan the stack of
-// the core, and the second time to end the stop-the-world phase.
-func gcSignalCore(core uint32) {
-	gcSignalWait.Set(1)
-	arm.Asm("sev")
-}
-
-// Returns the stack top (highest address) of the system stack of the given
-// core.
-func coreStackTop(core uint32) uintptr {
-	switch core {
-	case 0:
-		return uintptr(unsafe.Pointer(&stackTopSymbol))
-	case 1:
-		return uintptr(unsafe.Pointer(&stack1TopSymbol))
-	default:
-		runtimePanic("unexpected core")
-		return 0
-	}
-}
-
-// These spinlocks are needed by the runtime.
-var (
-	printLock     = spinLock{id: 20}
-	schedulerLock = spinLock{id: 21}
-	atomicsLock   = spinLock{id: 22}
-	futexLock     = spinLock{id: 23}
-)
-
-func resetSpinLocks() {
-	for i := uint8(0); i < numSpinlocks; i++ {
-		l := &spinLock{id: i}
-		l.spinlock().Set(0)
-	}
-}
-
-// A hardware spinlock, one of the 32 spinlocks defined in the SIO peripheral.
-type spinLock struct {
-	id uint8
-}
-
-// Return the spinlock register: rp.SIO.SPINLOCKx
-func (l *spinLock) spinlock() *volatile.Register32 {
-	return (*volatile.Register32)(unsafe.Add(unsafe.Pointer(&rp.SIO.SPINLOCK0), l.id*4))
-}
-
-func (l *spinLock) Lock() {
-	// Wait for the lock to be available.
-	spinlock := l.spinlock()
-	for spinlock.Get() == 0 {
-		arm.Asm("wfe")
-	}
-}
-
-func (l *spinLock) Unlock() {
-	l.spinlock().Set(0)
-	arm.Asm("sev")
-}
-
-// Wait until a signal is received, indicating that it can resume from the
-// spinloop.
-func spinLoopWait() {
-	arm.Asm("wfe")
-}
-
-func waitForEvents() {
-	arm.Asm("wfe")
-}
-
-func putchar(c byte) {
-	machine.Serial.WriteByte(c)
-}
-
-func getchar() byte {
-	for machine.Serial.Buffered() == 0 {
-		Gosched()
-	}
-	v, _ := machine.Serial.ReadByte()
-	return v
-}
-
-func buffered() int {
-	return machine.Serial.Buffered()
-}
-
-// machineInit is provided by package machine.
-func machineInit()
-
-func init() {
-	machineInit()
-
-	cdc.EnableUSBCDC()
-	machine.USBDev.Configure(machine.UARTConfig{})
-	machine.InitSerial()
-}
-
-func prerun() {
-	// Reset spinlocks before the full machineInit() so the scheduler doesn't
-	// hang waiting for schedulerLock after a soft reset.
-	resetSpinLocks()
-}
-
-//export Reset_Handler
-func main() {
-	preinit()
-	prerun()
-	run()
-	exit(0)
-}

src/runtime/runtime_rp2040.go

@@ -3,10 +3,365 @@
 package runtime
 
 import (
+	"device/arm"
 	"device/rp"
+	"internal/task"
+	"machine"
+	"machine/usb/cdc"
+	"runtime/interrupt"
+	"runtime/volatile"
+	"unsafe"
 )
 
-const (
+const numCPU = 2
-	sioIrqFifoProc0 = rp.IRQ_SIO_IRQ_PROC0
+
-	sioIrqFifoProc1 = rp.IRQ_SIO_IRQ_PROC1
+// machineTicks is provided by package machine.
+func machineTicks() uint64
+
+// machineLightSleep is provided by package machine.
+func machineLightSleep(uint64)
+
+// ticks returns the number of ticks (microseconds) elapsed since power up.
+func ticks() timeUnit {
+	t := machineTicks()
+	return timeUnit(t)
+}
+
+func ticksToNanoseconds(ticks timeUnit) int64 {
+	return int64(ticks) * 1000
+}
+
+func nanosecondsToTicks(ns int64) timeUnit {
+	return timeUnit(ns / 1000)
+}
+
+func sleepTicks(d timeUnit) {
+	if hasScheduler {
+		// With scheduler, sleepTicks may return early if an interrupt or
+		// event fires - so scheduler can schedule any go routines now
+		// eligible to run
+		machineLightSleep(uint64(d))
+		return
+	}
+
+	// Busy loop
+	sleepUntil := ticks() + d
+	for ticks() < sleepUntil {
+	}
+}
+
+// Currently sleeping core, or 0xff.
+// Must only be accessed with the scheduler lock held.
+var sleepingCore uint8 = 0xff
+
+// Return whether another core is sleeping.
+// May only be called with the scheduler lock held.
+func hasSleepingCore() bool {
+	return sleepingCore != 0xff
+}
+
+// Almost identical to sleepTicks, except that it will unlock/lock the scheduler
+// while sleeping and is interruptible by interruptSleepTicksMulticore.
+// This may only be called with the scheduler lock held.
+func sleepTicksMulticore(d timeUnit) {
+	sleepingCore = uint8(currentCPU())
+
+	// Note: interruptSleepTicksMulticore will be able to interrupt this, since
+	// it executes the "sev" instruction which would make sleepTicks return
+	// immediately without sleeping. Even if it happens while configuring the
+	// sleep operation.
+
+	schedulerLock.Unlock()
+	sleepTicks(d)
+	schedulerLock.Lock()
+
+	sleepingCore = 0xff
+}
+
+// Interrupt an ongoing call to sleepTicksMulticore on another core.
+func interruptSleepTicksMulticore(wakeup timeUnit) {
+	arm.Asm("sev")
+}
+
+// Number of cores that are currently in schedulerUnlockAndWait.
+// It is possible for both cores to be sleeping, if the program is waiting for
+// an interrupt (or is deadlocked).
+var waitingCore uint8
+
+// Put the scheduler to sleep, since there are no tasks to run.
+// This will unlock the scheduler lock, and must be called with the scheduler
+// lock held.
+func schedulerUnlockAndWait() {
+	waitingCore++
+	schedulerLock.Unlock()
+	arm.Asm("wfe")
+	schedulerLock.Lock()
+	waitingCore--
+}
+
+// Wake another core, if one is sleeping. Must be called with the scheduler lock
+// held.
+func schedulerWake() {
+	if waitingCore != 0 {
+		arm.Asm("sev")
+	}
+}
+
+// Return the current core number: 0 or 1.
+func currentCPU() uint32 {
+	return rp.SIO.CPUID.Get()
+}
+
+// Start the secondary cores for this chip.
+// On the RP2040, there is only one other core to start.
+func startSecondaryCores() {
+	// Start the second core of the RP2040.
+	// See section 2.8.2 in the datasheet.
+	seq := 0
+	for {
+		cmd := core1StartSequence[seq]
+		if cmd == 0 {
+			multicore_fifo_drain()
+			arm.Asm("sev")
+		}
+		multicore_fifo_push_blocking(cmd)
+		response := multicore_fifo_pop_blocking()
+		if cmd != response {
+			seq = 0
+			continue
+		}
+		seq = seq + 1
+		if seq >= len(core1StartSequence) {
+			break
+		}
+	}
+
+	// Enable the FIFO interrupt for the GC stop the world phase.
+	// We can only do this after we don't need the FIFO anymore for starting the
+	// second core.
+	intr := interrupt.New(rp.IRQ_SIO_IRQ_PROC0, func(intr interrupt.Interrupt) {
+		switch rp.SIO.FIFO_RD.Get() {
+		case 1:
+			gcInterruptHandler(0)
+		}
+	})
+	intr.Enable()
+	intr.SetPriority(0xff)
+}
+
+var core1StartSequence = [...]uint32{
+	0, 0, 1,
+	uint32(uintptr(unsafe.Pointer(&__isr_vector))),
+	uint32(uintptr(unsafe.Pointer(&stack1TopSymbol))),
+	uint32(exportedFuncPtr(runCore1)),
+}
+
+//go:extern __isr_vector
+var __isr_vector [0]uint32
+
+//go:extern _stack1_top
+var stack1TopSymbol [0]uint32
+
+// The function that is started on the second core.
+//
+//export tinygo_runCore1
+func runCore1() {
+	// Clear sticky bit that seems to have been set while starting this core.
+	rp.SIO.FIFO_ST.Set(rp.SIO_FIFO_ST_ROE)
+
+	// Enable the FIFO interrupt, mainly used for the stop-the-world phase of
+	// the GC.
+	// Use the lowest possible priority (highest priority value), so that other
+	// interrupts can still happen while the GC is running.
+	intr := interrupt.New(rp.IRQ_SIO_IRQ_PROC1, func(intr interrupt.Interrupt) {
+		switch rp.SIO.FIFO_RD.Get() {
+		case 1:
+			gcInterruptHandler(1)
+		}
+	})
+	intr.Enable()
+	intr.SetPriority(0xff)
+
+	// Now start running the scheduler on this core.
+	schedulerLock.Lock()
+	scheduler(false)
+	schedulerLock.Unlock()
+
+	// The main function returned.
+	exit(0)
+}
+
+// The below multicore_fifo_* functions have been translated from the Raspberry
+// Pi Pico SDK.
+
+func multicore_fifo_rvalid() bool {
+	return rp.SIO.FIFO_ST.Get()&rp.SIO_FIFO_ST_VLD != 0
+}
+
+func multicore_fifo_wready() bool {
+	return rp.SIO.FIFO_ST.Get()&rp.SIO_FIFO_ST_RDY != 0
+}
+
+func multicore_fifo_drain() {
+	for multicore_fifo_rvalid() {
+		rp.SIO.FIFO_RD.Get()
+	}
+}
+
+func multicore_fifo_push_blocking(data uint32) {
+	for !multicore_fifo_wready() {
+	}
+	rp.SIO.FIFO_WR.Set(data)
+	arm.Asm("sev")
+}
+
+func multicore_fifo_pop_blocking() uint32 {
+	for !multicore_fifo_rvalid() {
+		arm.Asm("wfe")
+	}
+
+	return rp.SIO.FIFO_RD.Get()
+}
+
+// Value used to communicate between the GC core and the other (paused) cores.
+var gcSignalWait volatile.Register8
+
+// The GC interrupted this core for the stop-the-world phase.
+// This function handles that, and only returns after the stop-the-world phase
+// ended.
+func gcInterruptHandler(hartID uint32) {
+	// Let the GC know we're ready.
+	gcScanState.Add(1)
+	arm.Asm("sev")
+
+	// Wait until we get a signal to start scanning.
+	for gcSignalWait.Get() == 0 {
+		arm.Asm("wfe")
+	}
+	gcSignalWait.Set(0)
+
+	// Scan the stack(s) of this core.
+	scanCurrentStack()
+	if !task.OnSystemStack() {
+		// Mark system stack.
+		markRoots(task.SystemStack(), coreStackTop(hartID))
+	}
+
+	// Signal we've finished scanning.
+	gcScanState.Store(1)
+	arm.Asm("sev")
+
+	// Wait until we get a signal that the stop-the-world phase has ended.
+	for gcSignalWait.Get() == 0 {
+		arm.Asm("wfe")
+	}
+	gcSignalWait.Set(0)
+
+	// Signal we received the signal and are going to exit the interrupt.
+	gcScanState.Add(1)
+	arm.Asm("sev")
+}
+
+// Pause the given core by sending it an interrupt.
+func gcPauseCore(core uint32) {
+	rp.SIO.FIFO_WR.Set(1)
+}
+
+// Signal the given core that it can resume one step.
+// This is called twice after gcPauseCore: the first time to scan the stack of
+// the core, and the second time to end the stop-the-world phase.
+func gcSignalCore(core uint32) {
+	gcSignalWait.Set(1)
+	arm.Asm("sev")
+}
+
+// Returns the stack top (highest address) of the system stack of the given
+// core.
+func coreStackTop(core uint32) uintptr {
+	switch core {
+	case 0:
+		return uintptr(unsafe.Pointer(&stackTopSymbol))
+	case 1:
+		return uintptr(unsafe.Pointer(&stack1TopSymbol))
+	default:
+		runtimePanic("unexpected core")
+		return 0
+	}
+}
+
+// These spinlocks are needed by the runtime.
+var (
+	printLock     = spinLock{id: 0}
+	schedulerLock = spinLock{id: 1}
+	atomicsLock   = spinLock{id: 2}
+	futexLock     = spinLock{id: 3}
 )
+
+// A hardware spinlock, one of the 32 spinlocks defined in the SIO peripheral.
+type spinLock struct {
+	id uint8
+}
+
+// Return the spinlock register: rp.SIO.SPINLOCKx
+func (l *spinLock) spinlock() *volatile.Register32 {
+	return (*volatile.Register32)(unsafe.Add(unsafe.Pointer(&rp.SIO.SPINLOCK0), l.id*4))
+}
+
+func (l *spinLock) Lock() {
+	// Wait for the lock to be available.
+	spinlock := l.spinlock()
+	for spinlock.Get() == 0 {
+		// TODO: use wfe and send an event when unlocking so the CPU can go to
+		// sleep while waiting for the lock.
+		// Unfortunately when doing that, time.Sleep() seems to hang somewhere.
+		// This needs some debugging to figure out.
+	}
+}
+
+func (l *spinLock) Unlock() {
+	l.spinlock().Set(0)
+}
+
+// Wait until a signal is received, indicating that it can resume from the
+// spinloop.
+func spinLoopWait() {
+	arm.Asm("wfe")
+}
+
+func waitForEvents() {
+	arm.Asm("wfe")
+}
+
+func putchar(c byte) {
+	machine.Serial.WriteByte(c)
+}
+
+func getchar() byte {
+	for machine.Serial.Buffered() == 0 {
+		Gosched()
+	}
+	v, _ := machine.Serial.ReadByte()
+	return v
+}
+
+func buffered() int {
+	return machine.Serial.Buffered()
+}
+
+// machineInit is provided by package machine.
+func machineInit()
+
+func init() {
+	machineInit()
+
+	cdc.EnableUSBCDC()
+	machine.USBDev.Configure(machine.UARTConfig{})
+	machine.InitSerial()
+}
+
+//export Reset_Handler
+func main() {
+	preinit()
+	run()
+	exit(0)
+}

src/runtime/runtime_rp2350.go

@@ -3,14 +3,84 @@
 package runtime
 
 import (
-	"device/rp"
+	"device/arm"
+	"machine"
+	"machine/usb/cdc"
 )
 
-const (
+// machineTicks is provided by package machine.
-	// On RP2040 each core has a different IRQ number: SIO_IRQ_PROC0 and SIO_IRQ_PROC1.
+func machineTicks() uint64
-	// On RP2350 both cores share the same irq number (SIO_IRQ_PROC) just with a
+
-	// different SIO interrupt output routed to that IRQ input on each core.
+// machineLightSleep is provided by package machine.
-	// https://www.raspberrypi.com/documentation/pico-sdk/high_level.html#group_pico_multicore_1ga1413ebfa65114c6f408f4675897ac5ee
+func machineLightSleep(uint64)
-	sioIrqFifoProc0 = rp.IRQ_SIO_IRQ_FIFO
+
-	sioIrqFifoProc1 = rp.IRQ_SIO_IRQ_FIFO
+// ticks returns the number of ticks (microseconds) elapsed since power up.
-)
+func ticks() timeUnit {
+	t := machineTicks()
+	return timeUnit(t)
+}
+
+func ticksToNanoseconds(ticks timeUnit) int64 {
+	return int64(ticks) * 1000
+}
+
+func nanosecondsToTicks(ns int64) timeUnit {
+	return timeUnit(ns / 1000)
+}
+
+func sleepTicks(d timeUnit) {
+	if d <= 0 {
+		return
+	}
+
+	if hasScheduler {
+		// With scheduler, sleepTicks may return early if an interrupt or
+		// event fires - so scheduler can schedule any go routines now
+		// eligible to run
+		machineLightSleep(uint64(d))
+		return
+	}
+
+	// Busy loop
+	sleepUntil := ticks() + d
+	for ticks() < sleepUntil {
+	}
+}
+
+func waitForEvents() {
+	arm.Asm("wfe")
+}
+
+func putchar(c byte) {
+	machine.Serial.WriteByte(c)
+}
+
+func getchar() byte {
+	for machine.Serial.Buffered() == 0 {
+		Gosched()
+	}
+	v, _ := machine.Serial.ReadByte()
+	return v
+}
+
+func buffered() int {
+	return machine.Serial.Buffered()
+}
+
+// machineInit is provided by package machine.
+func machineInit()
+
+func init() {
+	machineInit()
+
+	cdc.EnableUSBCDC()
+	machine.USBDev.Configure(machine.UARTConfig{})
+	machine.InitSerial()
+}
+
+//export Reset_Handler
+func main() {
+	preinit()
+	run()
+	exit(0)
+}

src/runtime/scheduler_cooperative.go

@@ -77,6 +77,7 @@ func addSleepTask(t *task.Task, duration timeUnit) {
 			panic("runtime: addSleepTask: expected next task to be nil")
 		}
 	}
+	t.Data = uint64(duration)
 	now := ticks()
 	if sleepQueue == nil {
 		scheduleLog("  -> sleep new queue")
@@ -84,7 +85,6 @@ func addSleepTask(t *task.Task, duration timeUnit) {
 		// set new base time
 		sleepQueueBaseTime = now
 	}
-	t.Data = uint64(duration + (now - sleepQueueBaseTime))
 
 	// Add to sleep queue.
 	q := &sleepQueue

src/runtime/time.go

@@ -46,9 +46,3 @@ func timerCallback(tn *timerNode, delta int64) {
 		addTimer(tn)
 	}
 }
-
-//go:linkname time_runtimeIsBubbled time.runtimeIsBubbled
-func time_runtimeIsBubbled() bool {
-	// We don't currently support bubbles.
-	return false
-}

src/sync/map.go

@@ -70,15 +70,3 @@ func (m *Map) Range(f func(key, value interface{}) bool) {
 		}
 	}
 }
-
-// Swap replaces the value for the given key, and returns the old value if any.
-func (m *Map) Swap(key, value any) (previous any, loaded bool) {
-	m.lock.Lock()
-	defer m.lock.Unlock()
-	if m.m == nil {
-		m.m = make(map[interface{}]interface{})
-	}
-	previous, loaded = m.m[key]
-	m.m[key] = value
-	return
-}

src/sync/map_test.go

@@ -17,22 +17,3 @@ func TestMapLoadAndDelete(t *testing.T) {
 		t.Errorf("LoadAndDelete returned %v, %v, want nil, false", v, ok)
 	}
 }
-
-func TestMapSwap(t *testing.T) {
-	var sm sync.Map
-	sm.Store("present", "value")
-
-	if v, ok := sm.Swap("present", "value2"); !ok || v != "value" {
-		t.Errorf("Swap returned %v, %v, want value, true", v, ok)
-	}
-	if v, ok := sm.Load("present"); !ok || v != "value2" {
-		t.Errorf("Load after Swap returned %v, %v, want value2, true", v, ok)
-	}
-
-	if v, ok := sm.Swap("new", "foo"); ok || v != nil {
-		t.Errorf("Swap returned %v, %v, want nil, false", v, ok)
-	}
-	if v, ok := sm.Load("present"); !ok || v != "value2" {
-		t.Errorf("Load after Swap returned %v, %v, want foo, true", v, ok)
-	}
-}

src/sync/mutex.go

@@ -31,9 +31,6 @@ type RWMutex struct {
 
 const rwMutexMaxReaders = 1 << 30
 
-// Lock locks rw for writing.
-// If the lock is already locked for reading or writing,
-// Lock blocks until the lock is available.
 func (rw *RWMutex) Lock() {
 	// Exclusive lock for writers.
 	rw.writerLock.Lock()
@@ -59,12 +56,6 @@ func (rw *RWMutex) Lock() {
 	rw.writer.Store(0)
 }
 
-// Unlock unlocks rw for writing. It is a run-time error if rw is
-// not locked for writing on entry to Unlock.
-//
-// As with Mutexes, a locked [RWMutex] is not associated with a particular
-// goroutine. One goroutine may [RWMutex.RLock] ([RWMutex.Lock]) a RWMutex and then
-// arrange for another goroutine to [RWMutex.RUnlock] ([RWMutex.Unlock]) it.
 func (rw *RWMutex) Unlock() {
 	// Signal that new readers can lock this mutex.
 	waiting := rw.readers.Add(rwMutexMaxReaders)
@@ -77,31 +68,6 @@ func (rw *RWMutex) Unlock() {
 	rw.writerLock.Unlock()
 }
 
-// TryLock tries to lock m and reports whether it succeeded.
-//
-// Note that while correct uses of TryLock do exist, they are rare,
-// and use of TryLock is often a sign of a deeper problem
-// in a particular use of mutexes.
-func (rw *RWMutex) TryLock() bool {
-	// Check for active writers
-	if !rw.writerLock.TryLock() {
-		return false
-	}
-	// Have write lock, now check for active readers
-	n := uint32(rwMutexMaxReaders)
-	if !rw.readers.CompareAndSwap(0, -n) {
-		// Active readers, give up write lock
-		rw.writerLock.Unlock()
-		return false
-	}
-	return true
-}
-
-// RLock locks rw for reading.
-//
-// It should not be used for recursive read locking; a blocked Lock
-// call excludes new readers from acquiring the lock. See the
-// documentation on the [RWMutex] type.
 func (rw *RWMutex) RLock() {
 	// Add us as a reader.
 	newVal := rw.readers.Add(1)
@@ -113,10 +79,6 @@ func (rw *RWMutex) RLock() {
 	}
 }
 
-// RUnlock undoes a single [RWMutex.RLock] call;
-// it does not affect other simultaneous readers.
-// It is a run-time error if rw is not locked for reading
-// on entry to RUnlock.
 func (rw *RWMutex) RUnlock() {
 	// Remove us as a reader.
 	one := uint32(1)
@@ -136,25 +98,6 @@ func (rw *RWMutex) RUnlock() {
 	}
 }
 
-// TryRLock tries to lock rw for reading and reports whether it succeeded.
-//
-// Note that while correct uses of TryRLock do exist, they are rare,
-// and use of TryRLock is often a sign of a deeper problem
-// in a particular use of mutexes.
-func (rw *RWMutex) TryRLock() bool {
-	for {
-		c := rw.readers.Load()
-		if c < 0 {
-			// There is a writer waiting or writing.
-			return false
-		}
-		if rw.readers.CompareAndSwap(c, c+1) {
-			// Read lock obtained.
-			return true
-		}
-	}
-}
-
 type Locker interface {
 	Lock()
 	Unlock()

src/sync/mutex_test.go

@@ -7,13 +7,7 @@ import (
 	"testing"
 )
 
-type mutex interface {
+func HammerMutex(m *sync.Mutex, loops int, cdone chan bool) {
-	Lock()
-	Unlock()
-	TryLock() bool
-}
-
-func HammerMutex(m mutex, loops int, cdone chan bool) {
 	for i := 0; i < loops; i++ {
 		if i%3 == 0 {
 			if m.TryLock() {
@@ -246,25 +240,3 @@ func TestRWMutexReadToWrite(t *testing.T) {
 		t.Errorf("write lock acquired while %d readers were active", res)
 	}
 }
-
-func TestRWMutex(t *testing.T) {
-	m := new(sync.RWMutex)
-
-	m.Lock()
-	if m.TryLock() {
-		t.Fatalf("TryLock succeeded with mutex locked")
-	}
-	m.Unlock()
-	if !m.TryLock() {
-		t.Fatalf("TryLock failed with mutex unlocked")
-	}
-	m.Unlock()
-
-	c := make(chan bool)
-	for i := 0; i < 10; i++ {
-		go HammerMutex(m, 1000, c)
-	}
-	for i := 0; i < 10; i++ {
-		<-c
-	}
-}

src/testing/benchmark.go

@@ -0,0 +1,517 @@
+// Copyright 2009 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.
+//
+// This file has been modified for use by the TinyGo compiler.
+
+package testing
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"math"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func initBenchmarkFlags() {
+	matchBenchmarks = flag.String("test.bench", "", "run only benchmarks matching `regexp`")
+	benchmarkMemory = flag.Bool("test.benchmem", false, "print memory allocations for benchmarks")
+	flag.Var(&benchTime, "test.benchtime", "run each benchmark for duration `d`")
+}
+
+var (
+	matchBenchmarks *string
+	benchmarkMemory *bool
+	benchTime       = benchTimeFlag{d: 1 * time.Second} // changed during test of testing package
+)
+
+type benchTimeFlag struct {
+	d time.Duration
+	n int
+}
+
+func (f *benchTimeFlag) String() string {
+	if f.n > 0 {
+		return fmt.Sprintf("%dx", f.n)
+	}
+	return time.Duration(f.d).String()
+}
+
+func (f *benchTimeFlag) Set(s string) error {
+	if strings.HasSuffix(s, "x") {
+		n, err := strconv.ParseInt(s[:len(s)-1], 10, 0)
+		if err != nil || n <= 0 {
+			return fmt.Errorf("invalid count")
+		}
+		*f = benchTimeFlag{n: int(n)}
+		return nil
+	}
+	d, err := time.ParseDuration(s)
+	if err != nil || d <= 0 {
+		return fmt.Errorf("invalid duration")
+	}
+	*f = benchTimeFlag{d: d}
+	return nil
+}
+
+// InternalBenchmark is an internal type but exported because it is cross-package;
+// it is part of the implementation of the "go test" command.
+type InternalBenchmark struct {
+	Name string
+	F    func(b *B)
+}
+
+// B is a type passed to Benchmark functions to manage benchmark
+// timing and to specify the number of iterations to run.
+//
+// A benchmark ends when its Benchmark function returns or calls any of the methods
+// FailNow, Fatal, Fatalf, SkipNow, Skip, or Skipf. Those methods must be called
+// only from the goroutine running the Benchmark function.
+// The other reporting methods, such as the variations of Log and Error,
+// may be called simultaneously from multiple goroutines.
+//
+// Like in tests, benchmark logs are accumulated during execution
+// and dumped to standard output when done. Unlike in tests, benchmark logs
+// are always printed, so as not to hide output whose existence may be
+// affecting benchmark results.
+type B struct {
+	common
+	context      *benchContext
+	N            int
+	benchFunc    func(b *B)
+	bytes        int64
+	missingBytes bool // one of the subbenchmarks does not have bytes set.
+	benchTime    benchTimeFlag
+	timerOn      bool
+	result       BenchmarkResult
+
+	// report memory statistics
+	showAllocResult bool
+	// initial state of MemStats.Mallocs and MemStats.TotalAlloc
+	startAllocs uint64
+	startBytes  uint64
+	// net total after running benchmar
+	netAllocs uint64
+	netBytes  uint64
+}
+
+// StartTimer starts timing a test. This function is called automatically
+// before a benchmark starts, but it can also be used to resume timing after
+// a call to StopTimer.
+func (b *B) StartTimer() {
+	if !b.timerOn {
+		b.start = time.Now()
+		b.timerOn = true
+
+		var mstats runtime.MemStats
+		runtime.ReadMemStats(&mstats)
+		b.startAllocs = mstats.Mallocs
+		b.startBytes = mstats.TotalAlloc
+	}
+}
+
+// StopTimer stops timing a test. This can be used to pause the timer
+// while performing complex initialization that you don't
+// want to measure.
+func (b *B) StopTimer() {
+	if b.timerOn {
+		b.duration += time.Since(b.start)
+		b.timerOn = false
+
+		var mstats runtime.MemStats
+		runtime.ReadMemStats(&mstats)
+		b.netAllocs += mstats.Mallocs - b.startAllocs
+		b.netBytes += mstats.TotalAlloc - b.startBytes
+	}
+}
+
+// ResetTimer zeroes the elapsed benchmark time and memory allocation counters
+// and deletes user-reported metrics.
+func (b *B) ResetTimer() {
+	if b.timerOn {
+		b.start = time.Now()
+
+		var mstats runtime.MemStats
+		runtime.ReadMemStats(&mstats)
+		b.startAllocs = mstats.Mallocs
+		b.startBytes = mstats.TotalAlloc
+	}
+	b.duration = 0
+	b.netAllocs = 0
+	b.netBytes = 0
+}
+
+// SetBytes records the number of bytes processed in a single operation.
+// If this is called, the benchmark will report ns/op and MB/s.
+func (b *B) SetBytes(n int64) { b.bytes = n }
+
+// ReportAllocs enables malloc statistics for this benchmark.
+// It is equivalent to setting -test.benchmem, but it only affects the
+// benchmark function that calls ReportAllocs.
+func (b *B) ReportAllocs() {
+	b.showAllocResult = true
+}
+
+// runN runs a single benchmark for the specified number of iterations.
+func (b *B) runN(n int) {
+	b.N = n
+	runtime.GC()
+	b.ResetTimer()
+	b.StartTimer()
+	b.benchFunc(b)
+	b.StopTimer()
+}
+
+func min(x, y int64) int64 {
+	if x > y {
+		return y
+	}
+	return x
+}
+
+func max(x, y int64) int64 {
+	if x < y {
+		return y
+	}
+	return x
+}
+
+// run1 runs the first iteration of benchFunc. It reports whether more
+// iterations of this benchmarks should be run.
+func (b *B) run1() bool {
+	if ctx := b.context; ctx != nil {
+		// Extend maxLen, if needed.
+		if n := len(b.name); n > ctx.maxLen {
+			ctx.maxLen = n + 8 // Add additional slack to avoid too many jumps in size.
+		}
+	}
+	b.runN(1)
+	return !b.hasSub
+}
+
+// run executes the benchmark.
+func (b *B) run() {
+	if b.context != nil {
+		// Running go test --test.bench
+		b.processBench(b.context) // calls doBench and prints results
+	} else {
+		// Running func Benchmark.
+		b.doBench()
+	}
+}
+
+func (b *B) doBench() BenchmarkResult {
+	// in upstream, this uses a goroutine
+	b.launch()
+	return b.result
+}
+
+// launch launches the benchmark function. It gradually increases the number
+// of benchmark iterations until the benchmark runs for the requested benchtime.
+// run1 must have been called on b.
+func (b *B) launch() {
+	// Run the benchmark for at least the specified amount of time.
+	if b.benchTime.n > 0 {
+		b.runN(b.benchTime.n)
+	} else {
+		d := b.benchTime.d
+		b.failed = false
+		b.duration = 0
+		for n := int64(1); !b.failed && b.duration < d && n < 1e9; {
+			last := n
+			// Predict required iterations.
+			goalns := d.Nanoseconds()
+			prevIters := int64(b.N)
+			prevns := b.duration.Nanoseconds()
+			if prevns <= 0 {
+				// Round up, to avoid div by zero.
+				prevns = 1
+			}
+			// Order of operations matters.
+			// For very fast benchmarks, prevIters ~= prevns.
+			// If you divide first, you get 0 or 1,
+			// which can hide an order of magnitude in execution time.
+			// So multiply first, then divide.
+			n = goalns * prevIters / prevns
+			// Run more iterations than we think we'll need (1.2x).
+			n += n / 5
+			// Don't grow too fast in case we had timing errors previously.
+			n = min(n, 100*last)
+			// Be sure to run at least one more than last time.
+			n = max(n, last+1)
+			// Don't run more than 1e9 times. (This also keeps n in int range on 32 bit platforms.)
+			n = min(n, 1e9)
+			b.runN(int(n))
+		}
+	}
+	b.result = BenchmarkResult{b.N, b.duration, b.bytes, b.netAllocs, b.netBytes}
+}
+
+// BenchmarkResult contains the results of a benchmark run.
+type BenchmarkResult struct {
+	N     int           // The number of iterations.
+	T     time.Duration // The total time taken.
+	Bytes int64         // Bytes processed in one iteration.
+
+	MemAllocs uint64 // The total number of memory allocations.
+	MemBytes  uint64 // The total number of bytes allocated.
+}
+
+// NsPerOp returns the "ns/op" metric.
+func (r BenchmarkResult) NsPerOp() int64 {
+	if r.N <= 0 {
+		return 0
+	}
+	return r.T.Nanoseconds() / int64(r.N)
+}
+
+// mbPerSec returns the "MB/s" metric.
+func (r BenchmarkResult) mbPerSec() float64 {
+	if r.Bytes <= 0 || r.T <= 0 || r.N <= 0 {
+		return 0
+	}
+	return (float64(r.Bytes) * float64(r.N) / 1e6) / r.T.Seconds()
+}
+
+// AllocsPerOp returns the "allocs/op" metric,
+// which is calculated as r.MemAllocs / r.N.
+func (r BenchmarkResult) AllocsPerOp() int64 {
+	if r.N <= 0 {
+		return 0
+	}
+	return int64(r.MemAllocs) / int64(r.N)
+}
+
+// AllocedBytesPerOp returns the "B/op" metric,
+// which is calculated as r.MemBytes / r.N.
+func (r BenchmarkResult) AllocedBytesPerOp() int64 {
+	if r.N <= 0 {
+		return 0
+	}
+	return int64(r.MemBytes) / int64(r.N)
+}
+
+// String returns a summary of the benchmark results.
+// It follows the benchmark result line format from
+// https://golang.org/design/14313-benchmark-format, not including the
+// benchmark name.
+// Extra metrics override built-in metrics of the same name.
+// String does not include allocs/op or B/op, since those are reported
+// by MemString.
+func (r BenchmarkResult) String() string {
+	buf := new(strings.Builder)
+	fmt.Fprintf(buf, "%8d", r.N)
+
+	// Get ns/op as a float.
+	ns := float64(r.T.Nanoseconds()) / float64(r.N)
+	if ns != 0 {
+		buf.WriteByte('\t')
+		prettyPrint(buf, ns, "ns/op")
+	}
+
+	if mbs := r.mbPerSec(); mbs != 0 {
+		fmt.Fprintf(buf, "\t%7.2f MB/s", mbs)
+	}
+	return buf.String()
+}
+
+// MemString returns r.AllocedBytesPerOp and r.AllocsPerOp in the same format as 'go test'.
+func (r BenchmarkResult) MemString() string {
+	return fmt.Sprintf("%8d B/op\t%8d allocs/op",
+		r.AllocedBytesPerOp(), r.AllocsPerOp())
+}
+
+func prettyPrint(w io.Writer, x float64, unit string) {
+	// Print all numbers with 10 places before the decimal point
+	// and small numbers with four sig figs. Field widths are
+	// chosen to fit the whole part in 10 places while aligning
+	// the decimal point of all fractional formats.
+	var format string
+	switch y := math.Abs(x); {
+	case y == 0 || y >= 999.95:
+		format = "%10.0f %s"
+	case y >= 99.995:
+		format = "%12.1f %s"
+	case y >= 9.9995:
+		format = "%13.2f %s"
+	case y >= 0.99995:
+		format = "%14.3f %s"
+	case y >= 0.099995:
+		format = "%15.4f %s"
+	case y >= 0.0099995:
+		format = "%16.5f %s"
+	case y >= 0.00099995:
+		format = "%17.6f %s"
+	default:
+		format = "%18.7f %s"
+	}
+	fmt.Fprintf(w, format, x, unit)
+}
+
+type benchContext struct {
+	match *matcher
+
+	maxLen int // The largest recorded benchmark name.
+}
+
+func runBenchmarks(matchString func(pat, str string) (bool, error), benchmarks []InternalBenchmark) bool {
+	// If no flag was specified, don't run benchmarks.
+	if len(*matchBenchmarks) == 0 {
+		return true
+	}
+	ctx := &benchContext{
+		match: newMatcher(matchString, *matchBenchmarks, "-test.bench", flagSkipRegexp),
+	}
+	var bs []InternalBenchmark
+	for _, Benchmark := range benchmarks {
+		if _, matched, _ := ctx.match.fullName(nil, Benchmark.Name); matched {
+			bs = append(bs, Benchmark)
+			benchName := Benchmark.Name
+			if l := len(benchName); l > ctx.maxLen {
+				ctx.maxLen = l
+			}
+		}
+	}
+	main := &B{
+		common: common{
+			output: &logger{},
+			name:   "Main",
+		},
+		benchTime: benchTime,
+		benchFunc: func(b *B) {
+			for _, Benchmark := range bs {
+				b.Run(Benchmark.Name, Benchmark.F)
+			}
+		},
+		context: ctx,
+	}
+
+	main.runN(1)
+	return true
+}
+
+// processBench runs bench b and prints the results.
+func (b *B) processBench(ctx *benchContext) {
+	benchName := b.name
+
+	for i := 0; i < flagCount; i++ {
+		if ctx != nil {
+			fmt.Printf("%-*s\t", ctx.maxLen, benchName)
+		}
+		r := b.doBench()
+		if b.failed {
+			// The output could be very long here, but probably isn't.
+			// We print it all, regardless, because we don't want to trim the reason
+			// the benchmark failed.
+			fmt.Printf("--- FAIL: %s\n%s", benchName, "") // b.output)
+			return
+		}
+		if ctx != nil {
+			results := r.String()
+
+			if *benchmarkMemory || b.showAllocResult {
+				results += "\t" + r.MemString()
+			}
+			fmt.Println(results)
+
+			// Print any benchmark output
+			if b.output.Len() > 0 {
+				fmt.Printf("--- BENCH: %s\n", benchName)
+				b.output.WriteTo(os.Stdout)
+			}
+		}
+	}
+}
+
+// Run benchmarks f as a subbenchmark with the given name. It reports
+// true if the subbenchmark succeeded.
+//
+// A subbenchmark is like any other benchmark. A benchmark that calls Run at
+// least once will not be measured itself and will be called once with N=1.
+func (b *B) Run(name string, f func(b *B)) bool {
+	benchName, ok, partial := b.name, true, false
+	if b.context != nil {
+		benchName, ok, partial = b.context.match.fullName(&b.common, name)
+	}
+	if !ok {
+		return true
+	}
+	b.hasSub = true
+	sub := &B{
+		common: common{
+			output: &logger{},
+			name:   benchName,
+			level:  b.level + 1,
+		},
+		benchFunc: f,
+		benchTime: b.benchTime,
+		context:   b.context,
+	}
+	if partial {
+		// Partial name match, like -bench=X/Y matching BenchmarkX.
+		// Only process sub-benchmarks, if any.
+		sub.hasSub = true
+	}
+	if sub.run1() {
+		sub.run()
+	}
+	b.add(sub.result)
+	return !sub.failed
+}
+
+// add simulates running benchmarks in sequence in a single iteration. It is
+// used to give some meaningful results in case func Benchmark is used in
+// combination with Run.
+func (b *B) add(other BenchmarkResult) {
+	r := &b.result
+	// The aggregated BenchmarkResults resemble running all subbenchmarks as
+	// in sequence in a single benchmark.
+	r.N = 1
+	r.T += time.Duration(other.NsPerOp())
+	if other.Bytes == 0 {
+		// Summing Bytes is meaningless in aggregate if not all subbenchmarks
+		// set it.
+		b.missingBytes = true
+		r.Bytes = 0
+	}
+	if !b.missingBytes {
+		r.Bytes += other.Bytes
+	}
+}
+
+// A PB is used by RunParallel for running parallel benchmarks.
+type PB struct {
+}
+
+// Next reports whether there are more iterations to execute.
+func (pb *PB) Next() bool {
+	return false
+}
+
+// RunParallel runs a benchmark in parallel.
+//
+// Not implemented
+func (b *B) RunParallel(body func(*PB)) {
+	return
+}
+
+// Benchmark benchmarks a single function. It is useful for creating
+// custom benchmarks that do not use the "go test" command.
+//
+// If f calls Run, the result will be an estimate of running all its
+// subbenchmarks that don't call Run in sequence in a single benchmark.
+func Benchmark(f func(b *B)) BenchmarkResult {
+	b := &B{
+		benchFunc: f,
+		benchTime: benchTime,
+	}
+	if b.run1() {
+		b.run()
+	}
+	return b.result
+}

src/testing/benchmark_test.go

@@ -0,0 +1,55 @@
+// Copyright 2011 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.
+
+package testing_test
+
+import (
+	"testing"
+)
+
+var buf = make([]byte, 13579)
+
+func NonASCII(b []byte, i int, offset int) int {
+	for i = offset; i < len(b)+offset; i++ {
+		if b[i%len(b)] >= 0x80 {
+			break
+		}
+	}
+	return i
+}
+
+func BenchmarkFastNonASCII(b *testing.B) {
+	var val int
+	for i := 0; i < b.N; i++ {
+		val += NonASCII(buf, 0, 0)
+	}
+}
+
+func BenchmarkSlowNonASCII(b *testing.B) {
+	var val int
+	for i := 0; i < b.N; i++ {
+		val += NonASCII(buf, 0, 0)
+		val += NonASCII(buf, 0, 1)
+	}
+}
+
+// TestBenchmark simply uses Benchmark twice and makes sure it does not crash.
+func TestBenchmark(t *testing.T) {
+	// FIXME: reduce runtime from the current 3 seconds.
+	rslow := testing.Benchmark(BenchmarkSlowNonASCII)
+	rfast := testing.Benchmark(BenchmarkFastNonASCII)
+	tslow := rslow.NsPerOp()
+	tfast := rfast.NsPerOp()
+
+	// Be exceedingly forgiving; do not fail even if system gets busy.
+	speedup := float64(tslow) / float64(tfast)
+	if speedup < 0.3 {
+		t.Errorf("Expected speedup >= 0.3, got %f", speedup)
+	}
+}
+
+func BenchmarkSub(b *testing.B) {
+	b.Run("Fast", func(b *testing.B) { BenchmarkFastNonASCII(b) })
+	b.Run("Slow", func(b *testing.B) { BenchmarkSlowNonASCII(b) })
+}

src/testing/doc.go

@@ -0,0 +1,6 @@
+package testing
+
+/*
+ This is a sad stub of the upstream testing package because it doesn't compile
+ with tinygo right now.
+*/

src/testing/fuzz.go

@@ -0,0 +1,143 @@
+package testing
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"time"
+)
+
+// InternalFuzzTarget is an internal type but exported because it is
+// cross-package; it is part of the implementation of the "go test" command.
+type InternalFuzzTarget struct {
+	Name string
+	Fn   func(f *F)
+}
+
+// F is a type passed to fuzz tests.
+//
+// Fuzz tests run generated inputs against a provided fuzz target, which can
+// find and report potential bugs in the code being tested.
+//
+// A fuzz test runs the seed corpus by default, which includes entries provided
+// by (*F).Add and entries in the testdata/fuzz/<FuzzTestName> directory. After
+// any necessary setup and calls to (*F).Add, the fuzz test must then call
+// (*F).Fuzz to provide the fuzz target. See the testing package documentation
+// for an example, and see the F.Fuzz and F.Add method documentation for
+// details.
+//
+// *F methods can only be called before (*F).Fuzz. Once the test is
+// executing the fuzz target, only (*T) methods can be used. The only *F methods
+// that are allowed in the (*F).Fuzz function are (*F).Failed and (*F).Name.
+type F struct {
+	common
+	fuzzContext *fuzzContext
+	testContext *testContext
+
+	// inFuzzFn is true when the fuzz function is running. Most F methods cannot
+	// be called when inFuzzFn is true.
+	inFuzzFn bool
+
+	// corpus is a set of seed corpus entries, added with F.Add and loaded
+	// from testdata.
+	corpus []corpusEntry
+
+	result     fuzzResult
+	fuzzCalled bool
+}
+
+// corpusEntry is an alias to the same type as internal/fuzz.CorpusEntry.
+// We use a type alias because we don't want to export this type, and we can't
+// import internal/fuzz from testing.
+type corpusEntry = struct {
+	Parent     string
+	Path       string
+	Data       []byte
+	Values     []interface{}
+	Generation int
+	IsSeed     bool
+}
+
+// Add will add the arguments to the seed corpus for the fuzz test. This will be
+// a no-op if called after or within the fuzz target, and args must match the
+// arguments for the fuzz target.
+func (f *F) Add(args ...interface{}) {
+	var values []interface{}
+	for i := range args {
+		if t := reflect.TypeOf(args[i]); !supportedTypes[t] {
+			panic(fmt.Sprintf("testing: unsupported type to Add %v", t))
+		}
+		values = append(values, args[i])
+	}
+	f.corpus = append(f.corpus, corpusEntry{Values: values, IsSeed: true, Path: fmt.Sprintf("seed#%d", len(f.corpus))})
+}
+
+// supportedTypes represents all of the supported types which can be fuzzed.
+var supportedTypes = map[reflect.Type]bool{
+	reflect.TypeOf(([]byte)("")):  true,
+	reflect.TypeOf((string)("")):  true,
+	reflect.TypeOf((bool)(false)): true,
+	reflect.TypeOf((byte)(0)):     true,
+	reflect.TypeOf((rune)(0)):     true,
+	reflect.TypeOf((float32)(0)):  true,
+	reflect.TypeOf((float64)(0)):  true,
+	reflect.TypeOf((int)(0)):      true,
+	reflect.TypeOf((int8)(0)):     true,
+	reflect.TypeOf((int16)(0)):    true,
+	reflect.TypeOf((int32)(0)):    true,
+	reflect.TypeOf((int64)(0)):    true,
+	reflect.TypeOf((uint)(0)):     true,
+	reflect.TypeOf((uint8)(0)):    true,
+	reflect.TypeOf((uint16)(0)):   true,
+	reflect.TypeOf((uint32)(0)):   true,
+	reflect.TypeOf((uint64)(0)):   true,
+}
+
+// Fuzz runs the fuzz function, ff, for fuzz testing. If ff fails for a set of
+// arguments, those arguments will be added to the seed corpus.
+//
+// ff must be a function with no return value whose first argument is *T and
+// whose remaining arguments are the types to be fuzzed.
+// For example:
+//
+//	f.Fuzz(func(t *testing.T, b []byte, i int) { ... })
+//
+// The following types are allowed: []byte, string, bool, byte, rune, float32,
+// float64, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64.
+// More types may be supported in the future.
+//
+// ff must not call any *F methods, e.g. (*F).Log, (*F).Error, (*F).Skip. Use
+// the corresponding *T method instead. The only *F methods that are allowed in
+// the (*F).Fuzz function are (*F).Failed and (*F).Name.
+//
+// This function should be fast and deterministic, and its behavior should not
+// depend on shared state. No mutatable input arguments, or pointers to them,
+// should be retained between executions of the fuzz function, as the memory
+// backing them may be mutated during a subsequent invocation. ff must not
+// modify the underlying data of the arguments provided by the fuzzing engine.
+//
+// When fuzzing, F.Fuzz does not return until a problem is found, time runs out
+// (set with -fuzztime), or the test process is interrupted by a signal. F.Fuzz
+// should be called exactly once, unless F.Skip or F.Fail is called beforehand.
+func (f *F) Fuzz(ff interface{}) {
+	f.failed = true
+	f.result.N = 0
+	f.result.T = 0
+	f.result.Error = errors.New("operation not implemented")
+	return
+}
+
+// fuzzContext holds fields common to all fuzz tests.
+type fuzzContext struct {
+	deps testDeps
+	mode fuzzMode
+}
+
+type fuzzMode uint8
+
+// fuzzResult contains the results of a fuzz run.
+type fuzzResult struct {
+	N     int           // The number of iterations.
+	T     time.Duration // The total time taken.
+	Error error         // Error is the error from the failing input
+}

src/testing/is_baremetal.go

@@ -0,0 +1,9 @@
+// Copyright 2016 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.
+//
+//go:build baremetal
+
+package testing
+
+const isBaremetal = true

src/testing/is_not_baremetal.go

@@ -0,0 +1,9 @@
+// Copyright 2016 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.
+//
+//go:build !baremetal
+
+package testing
+
+const isBaremetal = false

src/testing/match.go

@@ -0,0 +1,323 @@
+// Copyright 2015 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.
+
+package testing
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+// matcher sanitizes, uniques, and filters names of subtests and subbenchmarks.
+type matcher struct {
+	filter    filterMatch
+	skip      filterMatch
+	matchFunc func(pat, str string) (bool, error)
+
+	mu sync.Mutex
+
+	// subNames is used to deduplicate subtest names.
+	// Each key is the subtest name joined to the deduplicated name of the parent test.
+	// Each value is the count of the number of occurrences of the given subtest name
+	// already seen.
+	subNames map[string]int32
+}
+
+type filterMatch interface {
+	// matches checks the name against the receiver's pattern strings using the
+	// given match function.
+	matches(name []string, matchString func(pat, str string) (bool, error)) (ok, partial bool)
+
+	// verify checks that the receiver's pattern strings are valid filters by
+	// calling the given match function.
+	verify(name string, matchString func(pat, str string) (bool, error)) error
+}
+
+// simpleMatch matches a test name if all of the pattern strings match in
+// sequence.
+type simpleMatch []string
+
+// alternationMatch matches a test name if one of the alternations match.
+type alternationMatch []filterMatch
+
+// TODO: fix test_main to avoid race and improve caching, also allowing to
+// eliminate this Mutex.
+var matchMutex sync.Mutex
+
+func allMatcher() *matcher {
+	return newMatcher(nil, "", "", "")
+}
+
+func newMatcher(matchString func(pat, str string) (bool, error), patterns, name, skips string) *matcher {
+	if isBaremetal {
+		matchString = fakeMatchString
+	}
+
+	var filter, skip filterMatch
+	if patterns == "" {
+		filter = simpleMatch{} // always partial true
+	} else {
+		filter = splitRegexp(patterns)
+		if err := filter.verify(name, matchString); err != nil {
+			fmt.Fprintf(os.Stderr, "testing: invalid regexp for %s\n", err)
+			os.Exit(1)
+		}
+	}
+	if skips == "" {
+		skip = alternationMatch{} // always false
+	} else {
+		skip = splitRegexp(skips)
+		if err := skip.verify("-test.skip", matchString); err != nil {
+			fmt.Fprintf(os.Stderr, "testing: invalid regexp for %v\n", err)
+			os.Exit(1)
+		}
+	}
+	return &matcher{
+		filter:    filter,
+		skip:      skip,
+		matchFunc: matchString,
+		subNames:  map[string]int32{},
+	}
+}
+
+func (m *matcher) fullName(c *common, subname string) (name string, ok, partial bool) {
+	name = subname
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if c != nil && c.level > 0 {
+		name = m.unique(c.name, rewrite(subname))
+	}
+
+	matchMutex.Lock()
+	defer matchMutex.Unlock()
+
+	// We check the full array of paths each time to allow for the case that a pattern contains a '/'.
+	elem := strings.Split(name, "/")
+
+	// filter must match.
+	// accept partial match that may produce full match later.
+	ok, partial = m.filter.matches(elem, m.matchFunc)
+	if !ok {
+		return name, false, false
+	}
+
+	// skip must not match.
+	// ignore partial match so we can get to more precise match later.
+	skip, partialSkip := m.skip.matches(elem, m.matchFunc)
+	if skip && !partialSkip {
+		return name, false, false
+	}
+
+	return name, ok, partial
+}
+
+// clearSubNames clears the matcher's internal state, potentially freeing
+// memory. After this is called, T.Name may return the same strings as it did
+// for earlier subtests.
+func (m *matcher) clearSubNames() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key := range m.subNames {
+		delete(m.subNames, key)
+	}
+}
+
+func (m simpleMatch) matches(name []string, matchString func(pat, str string) (bool, error)) (ok, partial bool) {
+	for i, s := range name {
+		if i >= len(m) {
+			break
+		}
+		if ok, _ := matchString(m[i], s); !ok {
+			return false, false
+		}
+	}
+	return true, len(name) < len(m)
+}
+
+func (m simpleMatch) verify(name string, matchString func(pat, str string) (bool, error)) error {
+	for i, s := range m {
+		m[i] = rewrite(s)
+	}
+	// Verify filters before doing any processing.
+	for i, s := range m {
+		if _, err := matchString(s, "non-empty"); err != nil {
+			return fmt.Errorf("element %d of %s (%q): %s", i, name, s, err)
+		}
+	}
+	return nil
+}
+
+func (m alternationMatch) matches(name []string, matchString func(pat, str string) (bool, error)) (ok, partial bool) {
+	for _, m := range m {
+		if ok, partial = m.matches(name, matchString); ok {
+			return ok, partial
+		}
+	}
+	return false, false
+}
+
+func (m alternationMatch) verify(name string, matchString func(pat, str string) (bool, error)) error {
+	for i, m := range m {
+		if err := m.verify(name, matchString); err != nil {
+			return fmt.Errorf("alternation %d of %s", i, err)
+		}
+	}
+	return nil
+}
+
+func splitRegexp(s string) filterMatch {
+	a := make(simpleMatch, 0, strings.Count(s, "/"))
+	b := make(alternationMatch, 0, strings.Count(s, "|"))
+	cs := 0
+	cp := 0
+	for i := 0; i < len(s); {
+		switch s[i] {
+		case '[':
+			cs++
+		case ']':
+			if cs--; cs < 0 { // An unmatched ']' is legal.
+				cs = 0
+			}
+		case '(':
+			if cs == 0 {
+				cp++
+			}
+		case ')':
+			if cs == 0 {
+				cp--
+			}
+		case '\\':
+			i++
+		case '/':
+			if cs == 0 && cp == 0 {
+				a = append(a, s[:i])
+				s = s[i+1:]
+				i = 0
+				continue
+			}
+		case '|':
+			if cs == 0 && cp == 0 {
+				a = append(a, s[:i])
+				s = s[i+1:]
+				i = 0
+				b = append(b, a)
+				a = make(simpleMatch, 0, len(a))
+				continue
+			}
+		}
+		i++
+	}
+
+	a = append(a, s)
+	if len(b) == 0 {
+		return a
+	}
+	return append(b, a)
+}
+
+// unique creates a unique name for the given parent and subname by affixing it
+// with one or more counts, if necessary.
+func (m *matcher) unique(parent, subname string) string {
+	base := parent + "/" + subname
+
+	for {
+		n := m.subNames[base]
+		if n < 0 {
+			panic("subtest count overflow")
+		}
+		m.subNames[base] = n + 1
+
+		if n == 0 && subname != "" {
+			prefix, nn := parseSubtestNumber(base)
+			if len(prefix) < len(base) && nn < m.subNames[prefix] {
+				// This test is explicitly named like "parent/subname#NN",
+				// and #NN was already used for the NNth occurrence of "parent/subname".
+				// Loop to add a disambiguating suffix.
+				continue
+			}
+			return base
+		}
+
+		name := fmt.Sprintf("%s#%02d", base, n)
+		if m.subNames[name] != 0 {
+			// This is the nth occurrence of base, but the name "parent/subname#NN"
+			// collides with the first occurrence of a subtest *explicitly* named
+			// "parent/subname#NN". Try the next number.
+			continue
+		}
+
+		return name
+	}
+}
+
+// parseSubtestNumber splits a subtest name into a "#%02d"-formatted int32
+// suffix (if present), and a prefix preceding that suffix (always).
+func parseSubtestNumber(s string) (prefix string, nn int32) {
+	i := strings.LastIndex(s, "#")
+	if i < 0 {
+		return s, 0
+	}
+
+	prefix, suffix := s[:i], s[i+1:]
+	if len(suffix) < 2 || (len(suffix) > 2 && suffix[0] == '0') {
+		// Even if suffix is numeric, it is not a possible output of a "%02" format
+		// string: it has either too few digits or too many leading zeroes.
+		return s, 0
+	}
+	if suffix == "00" {
+		if !strings.HasSuffix(prefix, "/") {
+			// We only use "#00" as a suffix for subtests named with the empty
+			// string — it isn't a valid suffix if the subtest name is non-empty.
+			return s, 0
+		}
+	}
+
+	n, err := strconv.ParseInt(suffix, 10, 32)
+	if err != nil || n < 0 {
+		return s, 0
+	}
+	return prefix, int32(n)
+}
+
+// rewrite rewrites a subname to having only printable characters and no white
+// space.
+func rewrite(s string) string {
+	b := []byte{}
+	for _, r := range s {
+		switch {
+		case isSpace(r):
+			b = append(b, '_')
+		case !strconv.IsPrint(r):
+			s := strconv.QuoteRune(r)
+			b = append(b, s[1:len(s)-1]...)
+		default:
+			b = append(b, string(r)...)
+		}
+	}
+	return string(b)
+}
+
+func isSpace(r rune) bool {
+	if r < 0x2000 {
+		switch r {
+		// Note: not the same as Unicode Z class.
+		case '\t', '\n', '\v', '\f', '\r', ' ', 0x85, 0xA0, 0x1680:
+			return true
+		}
+	} else {
+		if r <= 0x200a {
+			return true
+		}
+		switch r {
+		case 0x2028, 0x2029, 0x202f, 0x205f, 0x3000:
+			return true
+		}
+	}
+	return false
+}

src/testing/match_test.go

@@ -0,0 +1,259 @@
+// Copyright 2015 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.
+
+package testing
+
+import (
+	"fmt"
+	"reflect"
+	"regexp"
+	"strings"
+	"unicode"
+)
+
+// Verify that our IsSpace agrees with unicode.IsSpace.
+func TestIsSpace(t *T) {
+	n := 0
+	for r := rune(0); r <= unicode.MaxRune; r++ {
+		if isSpace(r) != unicode.IsSpace(r) {
+			t.Errorf("IsSpace(%U)=%t incorrect", r, isSpace(r))
+			n++
+			if n > 10 {
+				return
+			}
+		}
+	}
+}
+
+func TestSplitRegexp(t *T) {
+	res := func(s ...string) filterMatch { return simpleMatch(s) }
+	alt := func(m ...filterMatch) filterMatch { return alternationMatch(m) }
+	testCases := []struct {
+		pattern string
+		result  filterMatch
+	}{
+		// Correct patterns
+		// If a regexp pattern is correct, all split regexps need to be correct
+		// as well.
+		{"", res("")},
+		{"/", res("", "")},
+		{"//", res("", "", "")},
+		{"A", res("A")},
+		{"A/B", res("A", "B")},
+		{"A/B/", res("A", "B", "")},
+		{"/A/B/", res("", "A", "B", "")},
+		{"[A]/(B)", res("[A]", "(B)")},
+		{"[/]/[/]", res("[/]", "[/]")},
+		{"[/]/[:/]", res("[/]", "[:/]")},
+		{"/]", res("", "]")},
+		{"]/", res("]", "")},
+		{"]/[/]", res("]", "[/]")},
+		{`([)/][(])`, res(`([)/][(])`)},
+		{"[(]/[)]", res("[(]", "[)]")},
+
+		{"A/B|C/D", alt(res("A", "B"), res("C", "D"))},
+
+		// Faulty patterns
+		// Errors in original should produce at least one faulty regexp in results.
+		{")/", res(")/")},
+		{")/(/)", res(")/(", ")")},
+		{"a[/)b", res("a[/)b")},
+		{"(/]", res("(/]")},
+		{"(/", res("(/")},
+		{"[/]/[/", res("[/]", "[/")},
+		{`\p{/}`, res(`\p{`, "}")},
+		{`\p/`, res(`\p`, "")},
+		{`[[:/:]]`, res(`[[:/:]]`)},
+	}
+	for _, tc := range testCases {
+		a := splitRegexp(tc.pattern)
+		if !reflect.DeepEqual(a, tc.result) {
+			t.Errorf("splitRegexp(%q) = %#v; want %#v", tc.pattern, a, tc.result)
+		}
+
+		// If there is any error in the pattern, one of the returned subpatterns
+		// needs to have an error as well.
+		if _, err := regexp.Compile(tc.pattern); err != nil {
+			ok := true
+			if err := a.verify("", regexp.MatchString); err != nil {
+				ok = false
+			}
+			if ok {
+				t.Errorf("%s: expected error in any of %q", tc.pattern, a)
+			}
+		}
+	}
+}
+
+func TestMatcher(t *T) {
+	testCases := []struct {
+		pattern     string
+		skip        string
+		parent, sub string
+		ok          bool
+		partial     bool
+	}{
+		// Behavior without subtests.
+		{"", "", "", "TestFoo", true, false},
+		{"TestFoo", "", "", "TestFoo", true, false},
+		{"TestFoo/", "", "", "TestFoo", true, true},
+		{"TestFoo/bar/baz", "", "", "TestFoo", true, true},
+		{"TestFoo", "", "", "TestBar", false, false},
+		{"TestFoo/", "", "", "TestBar", false, false},
+		{"TestFoo/bar/baz", "", "", "TestBar/bar/baz", false, false},
+		{"", "TestBar", "", "TestFoo", true, false},
+		{"", "TestBar", "", "TestBar", false, false},
+
+		// Skipping a non-existent test doesn't change anything.
+		{"", "TestFoo/skipped", "", "TestFoo", true, false},
+		{"TestFoo", "TestFoo/skipped", "", "TestFoo", true, false},
+		{"TestFoo/", "TestFoo/skipped", "", "TestFoo", true, true},
+		{"TestFoo/bar/baz", "TestFoo/skipped", "", "TestFoo", true, true},
+		{"TestFoo", "TestFoo/skipped", "", "TestBar", false, false},
+		{"TestFoo/", "TestFoo/skipped", "", "TestBar", false, false},
+		{"TestFoo/bar/baz", "TestFoo/skipped", "", "TestBar/bar/baz", false, false},
+
+		// with subtests
+		{"", "", "TestFoo", "x", true, false},
+		{"TestFoo", "", "TestFoo", "x", true, false},
+		{"TestFoo/", "", "TestFoo", "x", true, false},
+		{"TestFoo/bar/baz", "", "TestFoo", "bar", true, true},
+
+		{"", "TestFoo/skipped", "TestFoo", "x", true, false},
+		{"TestFoo", "TestFoo/skipped", "TestFoo", "x", true, false},
+		{"TestFoo", "TestFoo/skipped", "TestFoo", "skipped", false, false},
+		{"TestFoo/", "TestFoo/skipped", "TestFoo", "x", true, false},
+		{"TestFoo/bar/baz", "TestFoo/skipped", "TestFoo", "bar", true, true},
+
+		// Subtest with a '/' in its name still allows for copy and pasted names
+		// to match.
+		{"TestFoo/bar/baz", "", "TestFoo", "bar/baz", true, false},
+		{"TestFoo/bar/baz", "TestFoo/bar/baz", "TestFoo", "bar/baz", false, false},
+		{"TestFoo/bar/baz", "TestFoo/bar/baz/skip", "TestFoo", "bar/baz", true, false},
+		{"TestFoo/bar/baz", "", "TestFoo/bar", "baz", true, false},
+		{"TestFoo/bar/baz", "", "TestFoo", "x", false, false},
+		{"TestFoo", "", "TestBar", "x", false, false},
+		{"TestFoo/", "", "TestBar", "x", false, false},
+		{"TestFoo/bar/baz", "", "TestBar", "x/bar/baz", false, false},
+
+		{"A/B|C/D", "", "TestA", "B", true, false},
+		{"A/B|C/D", "", "TestC", "D", true, false},
+		{"A/B|C/D", "", "TestA", "C", false, false},
+
+		// subtests only
+		{"", "", "TestFoo", "x", true, false},
+		{"/", "", "TestFoo", "x", true, false},
+		{"./", "", "TestFoo", "x", true, false},
+		{"./.", "", "TestFoo", "x", true, false},
+		{"/bar/baz", "", "TestFoo", "bar", true, true},
+		{"/bar/baz", "", "TestFoo", "bar/baz", true, false},
+		{"//baz", "", "TestFoo", "bar/baz", true, false},
+		{"//", "", "TestFoo", "bar/baz", true, false},
+		{"/bar/baz", "", "TestFoo/bar", "baz", true, false},
+		{"//foo", "", "TestFoo", "bar/baz", false, false},
+		{"/bar/baz", "", "TestFoo", "x", false, false},
+		{"/bar/baz", "", "TestBar", "x/bar/baz", false, false},
+	}
+
+	for _, tc := range testCases {
+		m := newMatcher(regexp.MatchString, tc.pattern, "-test.run", tc.skip)
+
+		parent := &common{name: tc.parent}
+		if tc.parent != "" {
+			parent.level = 1
+		}
+		if n, ok, partial := m.fullName(parent, tc.sub); ok != tc.ok || partial != tc.partial {
+			t.Errorf("for pattern %q, fullName(parent=%q, sub=%q) = %q, ok %v partial %v; want ok %v partial %v",
+				tc.pattern, tc.parent, tc.sub, n, ok, partial, tc.ok, tc.partial)
+		}
+	}
+}
+
+var namingTestCases = []struct{ name, want string }{
+	// Uniqueness
+	{"", "x/#00"},
+	{"", "x/#01"},
+	{"#0", "x/#0"},      // Doesn't conflict with #00 because the number of digits differs.
+	{"#00", "x/#00#01"}, // Conflicts with implicit #00 (used above), so add a suffix.
+	{"#", "x/#"},
+	{"#", "x/##01"},
+
+	{"t", "x/t"},
+	{"t", "x/t#01"},
+	{"t", "x/t#02"},
+	{"t#00", "x/t#00"}, // Explicit "#00" doesn't conflict with the unsuffixed first subtest.
+
+	{"a#01", "x/a#01"},    // user has subtest with this name.
+	{"a", "x/a"},          // doesn't conflict with this name.
+	{"a", "x/a#02"},       // This string is claimed now, so resume
+	{"a", "x/a#03"},       // with counting.
+	{"a#02", "x/a#02#01"}, // We already used a#02 once, so add a suffix.
+
+	{"b#00", "x/b#00"},
+	{"b", "x/b"}, // Implicit 0 doesn't conflict with explicit "#00".
+	{"b", "x/b#01"},
+	{"b#9223372036854775807", "x/b#9223372036854775807"}, // MaxInt64
+	{"b", "x/b#02"},
+	{"b", "x/b#03"},
+
+	// Sanitizing
+	{"A:1 B:2", "x/A:1_B:2"},
+	{"s\t\r\u00a0", "x/s___"},
+	{"\x01", `x/\x01`},
+	{"\U0010ffff", `x/\U0010ffff`},
+}
+
+func TestNaming(t *T) {
+	m := newMatcher(regexp.MatchString, "", "", "")
+	parent := &common{name: "x", level: 1} // top-level test.
+
+	for i, tc := range namingTestCases {
+		if got, _, _ := m.fullName(parent, tc.name); got != tc.want {
+			t.Errorf("%d:%s: got %q; want %q", i, tc.name, got, tc.want)
+		}
+	}
+}
+
+func FuzzNaming(f *F) {
+	for _, tc := range namingTestCases {
+		f.Add(tc.name)
+	}
+	parent := &common{name: "x", level: 1}
+	var m *matcher
+	var seen map[string]string
+	reset := func() {
+		m = allMatcher()
+		seen = make(map[string]string)
+	}
+	reset()
+
+	f.Fuzz(func(t *T, subname string) {
+		if len(subname) > 10 {
+			// Long names attract the OOM killer.
+			t.Skip()
+		}
+		name := m.unique(parent.name, subname)
+		if !strings.Contains(name, "/"+subname) {
+			t.Errorf("name %q does not contain subname %q", name, subname)
+		}
+		if prev, ok := seen[name]; ok {
+			t.Errorf("name %q generated by both %q and %q", name, prev, subname)
+		}
+		if len(seen) > 1e6 {
+			// Free up memory.
+			reset()
+		}
+		seen[name] = subname
+	})
+}
+
+// GoString returns a string that is more readable than the default, which makes
+// it easier to read test errors.
+func (m alternationMatch) GoString() string {
+	s := make([]string, len(m))
+	for i, m := range m {
+		s[i] = fmt.Sprintf("%#v", m)
+	}
+	return fmt.Sprintf("(%s)", strings.Join(s, " | "))
+}

src/testing/sub_test.go

@@ -0,0 +1,80 @@
+// Copyright 2016 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.
+
+package testing
+
+import (
+	"reflect"
+)
+
+func TestCleanup(t *T) {
+	var cleanups []int
+	t.Run("test", func(t *T) {
+		t.Cleanup(func() { cleanups = append(cleanups, 1) })
+		t.Cleanup(func() { cleanups = append(cleanups, 2) })
+	})
+	if got, want := cleanups, []int{2, 1}; !reflect.DeepEqual(got, want) {
+		t.Errorf("unexpected cleanup record; got %v want %v", got, want)
+	}
+}
+
+func TestRunCleanup(t *T) {
+	outerCleanup := 0
+	innerCleanup := 0
+	t.Run("test", func(t *T) {
+		t.Cleanup(func() { outerCleanup++ })
+		t.Run("x", func(t *T) {
+			t.Cleanup(func() { innerCleanup++ })
+		})
+	})
+	if innerCleanup != 1 {
+		t.Errorf("unexpected inner cleanup count; got %d want 1", innerCleanup)
+	}
+	if outerCleanup != 1 {
+		t.Errorf("unexpected outer cleanup count; got %d want 1", outerCleanup) // wrong upstream!
+	}
+}
+
+func TestCleanupParallelSubtests(t *T) {
+	ranCleanup := 0
+	t.Run("test", func(t *T) {
+		t.Cleanup(func() { ranCleanup++ })
+		t.Run("x", func(t *T) {
+			t.Parallel()
+			if ranCleanup > 0 {
+				t.Error("outer cleanup ran before parallel subtest")
+			}
+		})
+	})
+	if ranCleanup != 1 {
+		t.Errorf("unexpected cleanup count; got %d want 1", ranCleanup)
+	}
+}
+
+func TestNestedCleanup(t *T) {
+	ranCleanup := 0
+	t.Run("test", func(t *T) {
+		t.Cleanup(func() {
+			if ranCleanup != 2 {
+				t.Errorf("unexpected cleanup count in first cleanup: got %d want 2", ranCleanup)
+			}
+			ranCleanup++
+		})
+		t.Cleanup(func() {
+			if ranCleanup != 0 {
+				t.Errorf("unexpected cleanup count in second cleanup: got %d want 0", ranCleanup)
+			}
+			ranCleanup++
+			t.Cleanup(func() {
+				if ranCleanup != 1 {
+					t.Errorf("unexpected cleanup count in nested cleanup: got %d want 1", ranCleanup)
+				}
+				ranCleanup++
+			})
+		})
+	})
+	if ranCleanup != 3 {
+		t.Errorf("unexpected cleanup count: got %d want 3", ranCleanup)
+	}
+}

src/testing/testing.go

@@ -0,0 +1,686 @@
+// Copyright 2009 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.
+//
+// This file has been modified for use by the TinyGo compiler.
+// src: https://github.com/golang/go/blob/61bb56ad/src/testing/testing.go
+
+// Package testing provides support for automated testing of Go packages.
+package testing
+
+import (
+	"bytes"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"io/fs"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+	"unicode/utf8"
+)
+
+// Testing flags.
+var (
+	flagVerbose    bool
+	flagShort      bool
+	flagRunRegexp  string
+	flagSkipRegexp string
+	flagShuffle    string
+	flagCount      int
+)
+
+var initRan bool
+
+// Init registers testing flags. It has no effect if it has already run.
+func Init() {
+	if initRan {
+		return
+	}
+	initRan = true
+
+	flag.BoolVar(&flagVerbose, "test.v", false, "verbose: print additional output")
+	flag.BoolVar(&flagShort, "test.short", false, "short: run smaller test suite to save time")
+	flag.StringVar(&flagRunRegexp, "test.run", "", "run: regexp of tests to run")
+	flag.StringVar(&flagSkipRegexp, "test.skip", "", "skip: regexp of tests to run")
+	flag.StringVar(&flagShuffle, "test.shuffle", "off", "shuffle: off, on, <numeric-seed>")
+
+	flag.IntVar(&flagCount, "test.count", 1, "run each test or benchmark `count` times")
+
+	initBenchmarkFlags()
+}
+
+// common holds the elements common between T and B and
+// captures common methods such as Errorf.
+type common struct {
+	output   *logger
+	indent   string
+	ran      bool     // Test or benchmark (or one of its subtests) was executed.
+	failed   bool     // Test or benchmark has failed.
+	skipped  bool     // Test of benchmark has been skipped.
+	cleanups []func() // optional functions to be called at the end of the test
+	finished bool     // Test function has completed.
+
+	hasSub bool // TODO: should be atomic
+
+	parent   *common
+	level    int       // Nesting depth of test or benchmark.
+	name     string    // Name of test or benchmark.
+	start    time.Time // Time test or benchmark started
+	duration time.Duration
+
+	tempDir    string
+	tempDirErr error
+	tempDirSeq int32
+}
+
+type logger struct {
+	logToStdout bool
+	b           bytes.Buffer
+}
+
+func (l *logger) Write(p []byte) (int, error) {
+	if l.logToStdout {
+		return os.Stdout.Write(p)
+	}
+	return l.b.Write(p)
+}
+
+func (l *logger) WriteTo(w io.Writer) (int64, error) {
+	if l.logToStdout {
+		// We've already been logging to stdout; nothing to do.
+		return 0, nil
+	}
+	return l.b.WriteTo(w)
+
+}
+
+func (l *logger) Len() int {
+	return l.b.Len()
+}
+
+// Short reports whether the -test.short flag is set.
+func Short() bool {
+	return flagShort
+}
+
+// CoverMode reports what the test coverage mode is set to.
+//
+// Test coverage is not supported; this returns the empty string.
+func CoverMode() string {
+	return ""
+}
+
+// Verbose reports whether the -test.v flag is set.
+func Verbose() bool {
+	return flagVerbose
+}
+
+// String constant that is being set when running a test.
+var testBinary string
+
+// Testing returns whether the program was compiled as a test, using "tinygo
+// test". It returns false when built using "tinygo build", "tinygo flash", etc.
+func Testing() bool {
+	return testBinary == "1"
+}
+
+// flushToParent writes c.output to the parent after first writing the header
+// with the given format and arguments.
+func (c *common) flushToParent(testName, format string, args ...interface{}) {
+	if c.parent == nil {
+		// The fake top-level test doesn't want a FAIL or PASS banner.
+		// Not quite sure how this works upstream.
+		c.output.WriteTo(os.Stdout)
+	} else {
+		fmt.Fprintf(c.parent.output, format, args...)
+		c.output.WriteTo(c.parent.output)
+	}
+}
+
+// fmtDuration returns a string representing d in the form "87.00s".
+func fmtDuration(d time.Duration) string {
+	return fmt.Sprintf("%.2fs", d.Seconds())
+}
+
+// TB is the interface common to T and B.
+type TB interface {
+	Cleanup(func())
+	Error(args ...interface{})
+	Errorf(format string, args ...interface{})
+	Fail()
+	FailNow()
+	Failed() bool
+	Fatal(args ...interface{})
+	Fatalf(format string, args ...interface{})
+	Helper()
+	Log(args ...interface{})
+	Logf(format string, args ...interface{})
+	Name() string
+	Setenv(key, value string)
+	Skip(args ...interface{})
+	SkipNow()
+	Skipf(format string, args ...interface{})
+	Skipped() bool
+	TempDir() string
+}
+
+var _ TB = (*T)(nil)
+var _ TB = (*B)(nil)
+
+// T is a type passed to Test functions to manage test state and support formatted test logs.
+// Logs are accumulated during execution and dumped to standard output when done.
+type T struct {
+	common
+	context *testContext // For running tests and subtests.
+}
+
+// Name returns the name of the running test or benchmark.
+func (c *common) Name() string {
+	return c.name
+}
+
+func (c *common) setRan() {
+	if c.parent != nil {
+		c.parent.setRan()
+	}
+	c.ran = true
+}
+
+// Fail marks the function as having failed but continues execution.
+func (c *common) Fail() {
+	c.failed = true
+}
+
+// Failed reports whether the function has failed.
+func (c *common) Failed() bool {
+	failed := c.failed
+	return failed
+}
+
+// FailNow marks the function as having failed and stops its execution
+// by calling runtime.Goexit (which then runs all deferred calls in the
+// current goroutine).
+func (c *common) FailNow() {
+	c.Fail()
+
+	c.finished = true
+	c.Error("FailNow is incomplete, requires runtime.Goexit()")
+}
+
+// log generates the output.
+func (c *common) log(s string) {
+	// This doesn't print the same as in upstream go, but works for now.
+	if len(s) != 0 && s[len(s)-1] == '\n' {
+		s = s[:len(s)-1]
+	}
+	lines := strings.Split(s, "\n")
+	// First line.
+	fmt.Fprintf(c.output, "%s    %s\n", c.indent, lines[0])
+	// More lines.
+	for _, line := range lines[1:] {
+		fmt.Fprintf(c.output, "%s        %s\n", c.indent, line)
+	}
+}
+
+// Log formats its arguments using default formatting, analogous to Println,
+// and records the text in the error log. For tests, the text will be printed only if
+// the test fails or the -test.v flag is set. For benchmarks, the text is always
+// printed to avoid having performance depend on the value of the -test.v flag.
+func (c *common) Log(args ...interface{}) { c.log(fmt.Sprintln(args...)) }
+
+// Logf formats its arguments according to the format, analogous to Printf, and
+// records the text in the error log. A final newline is added if not provided. For
+// tests, the text will be printed only if the test fails or the -test.v flag is
+// set. For benchmarks, the text is always printed to avoid having performance
+// depend on the value of the -test.v flag.
+func (c *common) Logf(format string, args ...interface{}) { c.log(fmt.Sprintf(format, args...)) }
+
+// Error is equivalent to Log followed by Fail.
+func (c *common) Error(args ...interface{}) {
+	c.log(fmt.Sprintln(args...))
+	c.Fail()
+}
+
+// Errorf is equivalent to Logf followed by Fail.
+func (c *common) Errorf(format string, args ...interface{}) {
+	c.log(fmt.Sprintf(format, args...))
+	c.Fail()
+}
+
+// Fatal is equivalent to Log followed by FailNow.
+func (c *common) Fatal(args ...interface{}) {
+	c.log(fmt.Sprintln(args...))
+	c.FailNow()
+}
+
+// Fatalf is equivalent to Logf followed by FailNow.
+func (c *common) Fatalf(format string, args ...interface{}) {
+	c.log(fmt.Sprintf(format, args...))
+	c.FailNow()
+}
+
+// Skip is equivalent to Log followed by SkipNow.
+func (c *common) Skip(args ...interface{}) {
+	c.log(fmt.Sprintln(args...))
+	c.SkipNow()
+}
+
+// Skipf is equivalent to Logf followed by SkipNow.
+func (c *common) Skipf(format string, args ...interface{}) {
+	c.log(fmt.Sprintf(format, args...))
+	c.SkipNow()
+}
+
+// SkipNow marks the test as having been skipped and stops its execution
+// by calling runtime.Goexit.
+func (c *common) SkipNow() {
+	c.skip()
+	c.finished = true
+	c.Error("SkipNow is incomplete, requires runtime.Goexit()")
+}
+
+func (c *common) skip() {
+	c.skipped = true
+}
+
+// Skipped reports whether the test was skipped.
+func (c *common) Skipped() bool {
+	return c.skipped
+}
+
+// Helper is not implemented, it is only provided for compatibility.
+func (c *common) Helper() {
+	// Unimplemented.
+}
+
+// Cleanup registers a function to be called when the test (or subtest) and all its
+// subtests complete. Cleanup functions will be called in last added,
+// first called order.
+func (c *common) Cleanup(f func()) {
+	c.cleanups = append(c.cleanups, f)
+}
+
+// TempDir returns a temporary directory for the test to use.
+// The directory is automatically removed by Cleanup when the test and
+// all its subtests complete.
+// Each subsequent call to t.TempDir returns a unique directory;
+// if the directory creation fails, TempDir terminates the test by calling Fatal.
+func (c *common) TempDir() string {
+	// Use a single parent directory for all the temporary directories
+	// created by a test, each numbered sequentially.
+	var nonExistent bool
+	if c.tempDir == "" { // Usually the case with js/wasm
+		nonExistent = true
+	} else {
+		_, err := os.Stat(c.tempDir)
+		nonExistent = errors.Is(err, fs.ErrNotExist)
+		if err != nil && !nonExistent {
+			c.Fatalf("TempDir: %v", err)
+		}
+	}
+
+	if nonExistent {
+		c.Helper()
+
+		// Drop unusual characters (such as path separators or
+		// characters interacting with globs) from the directory name to
+		// avoid surprising os.MkdirTemp behavior.
+		mapper := func(r rune) rune {
+			if r < utf8.RuneSelf {
+				const allowed = "!#$%&()+,-.=@^_{}~ "
+				if '0' <= r && r <= '9' ||
+					'a' <= r && r <= 'z' ||
+					'A' <= r && r <= 'Z' {
+					return r
+				}
+				if strings.ContainsRune(allowed, r) {
+					return r
+				}
+			} else if unicode.IsLetter(r) || unicode.IsNumber(r) {
+				return r
+			}
+			return -1
+		}
+		pattern := strings.Map(mapper, c.Name())
+		c.tempDir, c.tempDirErr = os.MkdirTemp("", pattern)
+		if c.tempDirErr == nil {
+			c.Cleanup(func() {
+				if err := os.RemoveAll(c.tempDir); err != nil {
+					c.Errorf("TempDir RemoveAll cleanup: %v", err)
+				}
+			})
+		}
+	}
+
+	if c.tempDirErr != nil {
+		c.Fatalf("TempDir: %v", c.tempDirErr)
+	}
+	seq := c.tempDirSeq
+	c.tempDirSeq++
+	dir := fmt.Sprintf("%s%c%03d", c.tempDir, os.PathSeparator, seq)
+	if err := os.Mkdir(dir, 0777); err != nil {
+		c.Fatalf("TempDir: %v", err)
+	}
+	return dir
+}
+
+// Setenv calls os.Setenv(key, value) and uses Cleanup to
+// restore the environment variable to its original value
+// after the test.
+func (c *common) Setenv(key, value string) {
+	prevValue, ok := os.LookupEnv(key)
+
+	if err := os.Setenv(key, value); err != nil {
+		c.Fatalf("cannot set environment variable: %v", err)
+	}
+
+	if ok {
+		c.Cleanup(func() {
+			os.Setenv(key, prevValue)
+		})
+	} else {
+		c.Cleanup(func() {
+			os.Unsetenv(key)
+		})
+	}
+}
+
+// Chdir calls os.Chdir(dir) and uses Cleanup to restore the current
+// working directory to its original value after the test. On Unix, it
+// also sets PWD environment variable for the duration of the test.
+//
+// Because Chdir affects the whole process, it cannot be used
+// in parallel tests or tests with parallel ancestors.
+func (c *common) Chdir(dir string) {
+	// Note: function copied from the Go 1.24.0 source tree.
+
+	oldwd, err := os.Open(".")
+	if err != nil {
+		c.Fatal(err)
+	}
+	if err := os.Chdir(dir); err != nil {
+		c.Fatal(err)
+	}
+	// On POSIX platforms, PWD represents “an absolute pathname of the
+	// current working directory.” Since we are changing the working
+	// directory, we should also set or update PWD to reflect that.
+	switch runtime.GOOS {
+	case "windows", "plan9":
+		// Windows and Plan 9 do not use the PWD variable.
+	default:
+		if !filepath.IsAbs(dir) {
+			dir, err = os.Getwd()
+			if err != nil {
+				c.Fatal(err)
+			}
+		}
+		c.Setenv("PWD", dir)
+	}
+	c.Cleanup(func() {
+		err := oldwd.Chdir()
+		oldwd.Close()
+		if err != nil {
+			// It's not safe to continue with tests if we can't
+			// get back to the original working directory. Since
+			// we are holding a dirfd, this is highly unlikely.
+			panic("testing.Chdir: " + err.Error())
+		}
+	})
+}
+
+// runCleanup is called at the end of the test.
+func (c *common) runCleanup() {
+	for {
+		var cleanup func()
+		if len(c.cleanups) > 0 {
+			last := len(c.cleanups) - 1
+			cleanup = c.cleanups[last]
+			c.cleanups = c.cleanups[:last]
+		}
+		if cleanup == nil {
+			return
+		}
+		cleanup()
+	}
+}
+
+// Parallel is not implemented, it is only provided for compatibility.
+func (t *T) Parallel() {
+	// Unimplemented.
+}
+
+// InternalTest is a reference to a test that should be called during a test suite run.
+type InternalTest struct {
+	Name string
+	F    func(*T)
+}
+
+func tRunner(t *T, fn func(t *T)) {
+	defer func() {
+		t.runCleanup()
+	}()
+
+	// Run the test.
+	t.start = time.Now()
+	fn(t)
+	t.duration += time.Since(t.start) // TODO: capture cleanup time, too.
+
+	t.report() // Report after all subtests have finished.
+	if t.parent != nil && !t.hasSub {
+		t.setRan()
+	}
+}
+
+// Run runs f as a subtest of t called name. It waits until the subtest is finished
+// and returns whether the subtest succeeded.
+func (t *T) Run(name string, f func(t *T)) bool {
+	t.hasSub = true
+	testName, ok, _ := t.context.match.fullName(&t.common, name)
+	if !ok {
+		return true
+	}
+
+	// Create a subtest.
+	sub := T{
+		common: common{
+			output: &logger{logToStdout: flagVerbose},
+			name:   testName,
+			parent: &t.common,
+			level:  t.level + 1,
+		},
+		context: t.context,
+	}
+	if t.level > 0 {
+		sub.indent = sub.indent + "    "
+	}
+	if flagVerbose {
+		fmt.Fprintf(t.output, "=== RUN   %s\n", sub.name)
+	}
+
+	tRunner(&sub, f)
+	return !sub.failed
+}
+
+// Deadline reports the time at which the test binary will have
+// exceeded the timeout specified by the -timeout flag.
+//
+// The ok result is false if the -timeout flag indicates “no timeout” (0).
+// For now tinygo always return 0, false.
+//
+// Not Implemented.
+func (t *T) Deadline() (deadline time.Time, ok bool) {
+	deadline = t.context.deadline
+	return deadline, !deadline.IsZero()
+}
+
+// testContext holds all fields that are common to all tests. This includes
+// synchronization primitives to run at most *parallel tests.
+type testContext struct {
+	match    *matcher
+	deadline time.Time
+}
+
+func newTestContext(m *matcher) *testContext {
+	return &testContext{
+		match: m,
+	}
+}
+
+// M is a test suite.
+type M struct {
+	// tests is a list of the test names to execute
+	Tests      []InternalTest
+	Benchmarks []InternalBenchmark
+
+	deps testDeps
+
+	// value to pass to os.Exit, the outer test func main
+	// harness calls os.Exit with this code. See #34129.
+	exitCode int
+}
+
+type testDeps interface {
+	MatchString(pat, str string) (bool, error)
+}
+
+func (m *M) shuffle() error {
+	var n int64
+
+	if flagShuffle == "on" {
+		n = time.Now().UnixNano()
+	} else {
+		var err error
+		n, err = strconv.ParseInt(flagShuffle, 10, 64)
+		if err != nil {
+			m.exitCode = 2
+			return fmt.Errorf(`testing: -shuffle should be "off", "on", or a valid integer: %v`, err)
+		}
+	}
+
+	fmt.Println("-test.shuffle", n)
+	rng := rand.New(rand.NewSource(n))
+	rng.Shuffle(len(m.Tests), func(i, j int) { m.Tests[i], m.Tests[j] = m.Tests[j], m.Tests[i] })
+	rng.Shuffle(len(m.Benchmarks), func(i, j int) { m.Benchmarks[i], m.Benchmarks[j] = m.Benchmarks[j], m.Benchmarks[i] })
+	return nil
+}
+
+// Run runs the tests. It returns an exit code to pass to os.Exit.
+func (m *M) Run() (code int) {
+	defer func() {
+		code = m.exitCode
+	}()
+
+	if !flag.Parsed() {
+		flag.Parse()
+	}
+
+	if flagShuffle != "off" {
+		if err := m.shuffle(); err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+	}
+
+	testRan, testOk := runTests(m.deps.MatchString, m.Tests)
+	if !testRan && *matchBenchmarks == "" {
+		fmt.Fprintln(os.Stderr, "testing: warning: no tests to run")
+	}
+	if !testOk || !runBenchmarks(m.deps.MatchString, m.Benchmarks) {
+		fmt.Println("FAIL")
+		m.exitCode = 1
+	} else {
+		fmt.Println("PASS")
+		m.exitCode = 0
+	}
+	return
+}
+
+func runTests(matchString func(pat, str string) (bool, error), tests []InternalTest) (ran, ok bool) {
+	ok = true
+
+	ctx := newTestContext(newMatcher(matchString, flagRunRegexp, "-test.run", flagSkipRegexp))
+	t := &T{
+		common: common{
+			output: &logger{logToStdout: flagVerbose},
+		},
+		context: ctx,
+	}
+
+	for i := 0; i < flagCount; i++ {
+		tRunner(t, func(t *T) {
+			for _, test := range tests {
+				t.Run(test.Name, test.F)
+				ok = ok && !t.Failed()
+			}
+		})
+	}
+
+	return t.ran, ok
+}
+
+func (t *T) report() {
+	dstr := fmtDuration(t.duration)
+	format := t.indent + "--- %s: %s (%s)\n"
+	if t.Failed() {
+		if t.parent != nil {
+			t.parent.failed = true
+		}
+		t.flushToParent(t.name, format, "FAIL", t.name, dstr)
+	} else if flagVerbose {
+		if t.Skipped() {
+			t.flushToParent(t.name, format, "SKIP", t.name, dstr)
+		} else {
+			t.flushToParent(t.name, format, "PASS", t.name, dstr)
+		}
+	}
+}
+
+// AllocsPerRun returns the average number of allocations during calls to f.
+// Although the return value has type float64, it will always be an integral
+// value.
+//
+// Not implemented.
+func AllocsPerRun(runs int, f func()) (avg float64) {
+	f()
+	for i := 0; i < runs; i++ {
+		f()
+	}
+	return 0
+}
+
+type InternalExample struct {
+	Name      string
+	F         func()
+	Output    string
+	Unordered bool
+}
+
+// MainStart is meant for use by tests generated by 'go test'.
+// It is not meant to be called directly and is not subject to the Go 1 compatibility document.
+// It may change signature from release to release.
+func MainStart(deps interface{}, tests []InternalTest, benchmarks []InternalBenchmark, fuzzTargets []InternalFuzzTarget, examples []InternalExample) *M {
+	Init()
+	return &M{
+		Tests:      tests,
+		Benchmarks: benchmarks,
+		deps:       deps.(testDeps),
+	}
+}
+
+// A fake regexp matcher.
+// Inflexible, but saves 50KB of flash and 50KB of RAM per -size full,
+// and lets tests pass on cortex-m.
+func fakeMatchString(pat, str string) (bool, error) {
+	if pat == ".*" {
+		return true, nil
+	}
+	matched := strings.Contains(str, pat)
+	return matched, nil
+}

src/testing/testing_test.go

@@ -0,0 +1,204 @@
+//go:build !windows
+
+// TODO: implement readdir for windows, then enable this file
+
+// Copyright 2014 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.
+
+package testing_test
+
+import (
+	"errors"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+// This is exactly what a test would do without a TestMain.
+// It's here only so that there is at least one package in the
+// standard library with a TestMain, so that code is executed.
+
+func TestMain(m *testing.M) {
+	os.Exit(m.Run())
+}
+
+func TestTempDirInCleanup(t *testing.T) {
+	if runtime.GOOS == "wasip1" || runtime.GOOS == "wasip2" {
+		t.Log("Skipping.  TODO: implement RemoveAll for wasi")
+		return
+	}
+
+	var dir string
+
+	t.Run("test", func(t *testing.T) {
+		t.Cleanup(func() {
+			dir = t.TempDir()
+		})
+		_ = t.TempDir()
+	})
+
+	fi, err := os.Stat(dir)
+	if fi != nil {
+		t.Fatalf("Directory %q from user Cleanup still exists", dir)
+	}
+	if !errors.Is(err, fs.ErrNotExist) {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+}
+
+func TestTempDirInBenchmark(t *testing.T) {
+	testing.Benchmark(func(b *testing.B) {
+		if !b.Run("test", func(b *testing.B) {
+			// Add a loop so that the test won't fail. See issue 38677.
+			for i := 0; i < b.N; i++ {
+				_ = b.TempDir()
+			}
+		}) {
+			t.Fatal("Sub test failure in a benchmark")
+		}
+	})
+}
+
+func TestTempDir(t *testing.T) {
+	if runtime.GOOS == "wasip1" || runtime.GOOS == "wasip2" {
+		t.Log("Skipping.  TODO: implement RemoveAll for wasi")
+		return
+	}
+
+	testTempDir(t)
+	t.Run("InSubtest", testTempDir)
+	t.Run("test/subtest", testTempDir)
+	t.Run("test\\subtest", testTempDir)
+	t.Run("test:subtest", testTempDir)
+	t.Run("test/..", testTempDir)
+	t.Run("../test", testTempDir)
+	t.Run("test[]", testTempDir)
+	t.Run("test*", testTempDir)
+	t.Run("äöüéè", testTempDir)
+}
+
+func testTempDir(t *testing.T) {
+	dirCh := make(chan string, 1)
+	t.Cleanup(func() {
+		// Verify directory has been removed.
+		select {
+		case dir := <-dirCh:
+			fi, err := os.Stat(dir)
+			if errors.Is(err, fs.ErrNotExist) {
+				// All good
+				return
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			t.Errorf("directory %q still exists: %v, isDir=%v", dir, fi, fi.IsDir())
+		default:
+			if !t.Failed() {
+				t.Fatal("never received dir channel")
+			}
+		}
+	})
+
+	dir := t.TempDir()
+	if dir == "" {
+		t.Fatal("expected dir")
+	}
+	dir2 := t.TempDir()
+	if dir == dir2 {
+		t.Fatal("subsequent calls to TempDir returned the same directory")
+	}
+	if filepath.Dir(dir) != filepath.Dir(dir2) {
+		t.Fatalf("calls to TempDir do not share a parent; got %q, %q", dir, dir2)
+	}
+	dirCh <- dir
+	fi, err := os.Stat(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !fi.IsDir() {
+		t.Errorf("dir %q is not a dir", dir)
+	}
+	files, err := os.ReadDir(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(files) > 0 {
+		t.Errorf("unexpected %d files in TempDir: %v", len(files), files)
+	}
+
+	glob := filepath.Join(dir, "*.txt")
+	if _, err := filepath.Glob(glob); err != nil {
+		t.Error(err)
+	}
+
+	err = os.Remove(dir)
+	if err != nil {
+		t.Errorf("unexpected files in TempDir")
+	}
+}
+
+func TestSetenv(t *testing.T) {
+	tests := []struct {
+		name               string
+		key                string
+		initialValueExists bool
+		initialValue       string
+		newValue           string
+	}{
+		{
+			name:               "initial value exists",
+			key:                "GO_TEST_KEY_1",
+			initialValueExists: true,
+			initialValue:       "111",
+			newValue:           "222",
+		},
+		{
+			name:               "initial value exists but empty",
+			key:                "GO_TEST_KEY_2",
+			initialValueExists: true,
+			initialValue:       "",
+			newValue:           "222",
+		},
+		{
+			name:               "initial value is not exists",
+			key:                "GO_TEST_KEY_3",
+			initialValueExists: false,
+			initialValue:       "",
+			newValue:           "222",
+		},
+	}
+
+	for _, test := range tests {
+		if test.initialValueExists {
+			if err := os.Setenv(test.key, test.initialValue); err != nil {
+				t.Fatalf("unable to set env: got %v", err)
+			}
+		} else {
+			os.Unsetenv(test.key)
+		}
+
+		t.Run(test.name, func(t *testing.T) {
+			t.Setenv(test.key, test.newValue)
+			if os.Getenv(test.key) != test.newValue {
+				t.Fatalf("unexpected value after t.Setenv: got %s, want %s", os.Getenv(test.key), test.newValue)
+			}
+		})
+
+		got, exists := os.LookupEnv(test.key)
+		if got != test.initialValue {
+			t.Fatalf("unexpected value after t.Setenv cleanup: got %s, want %s", got, test.initialValue)
+		}
+		if exists != test.initialValueExists {
+			t.Fatalf("unexpected value after t.Setenv cleanup: got %t, want %t", exists, test.initialValueExists)
+		}
+	}
+}
+
+func TestTesting(t *testing.T) {
+	if !testing.Testing() {
+		t.Error("Expected testing.Testing() to return true while in a test")
+	}
+}

targets/badger2040-w.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["2e8a:0003"],
-    "default-stack-size": 8192,
     "build-tags": ["badger2040_w", "cyw43439"],
     "ldflags": [
         "--defsym=__flash_size=1020K"

targets/badger2040.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["2e8a:0003"],
-    "default-stack-size": 8192,
     "build-tags": ["badger2040"],
     "ldflags": [
         "--defsym=__flash_size=1020K"

targets/challenger-rp2040.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["2e8a:1023"],
-    "default-stack-size": 8192,
     "build-tags": ["challenger_rp2040"],
     "ldflags": [
         "--defsym=__flash_size=8M"

targets/feather-rp2040.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["239a:80f1"],
-    "default-stack-size": 8192,
     "build-tags": ["feather_rp2040"],
     "ldflags": [
         "--defsym=__flash_size=8192K"

targets/gopher-arcade.json

@@ -1,10 +0,0 @@
-{
-	"inherits": ["attiny85"],
-	"build-tags": ["gopher_arcade"],
-	"ldflags": [
-		"--defsym=_bootloader_size=2180",
-		"--defsym=_stack_size=128"
-	],
-	"flash-command": "avrdude -c usbasp -p t85 -B 10 -U flash:w:{hex}:i",
-	"emulator": "simavr -m attiny85 -f 16000000 {}"
-}

targets/gopher-badge.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["2e8a:0003"],
-    "default-stack-size": 8192,
     "build-tags": ["gopher_badge"],
     "ldflags": [
         "--defsym=__flash_size=8M"

targets/macropad-rp2040.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "build-tags": ["macropad_rp2040"],
-    "default-stack-size": 8192,
     "serial-port": ["239a:8107"],
     "ldflags": [
         "--defsym=__flash_size=8M"

targets/metro-rp2350.json

@@ -1,11 +0,0 @@
-{
-    "inherits": [
-        "rp2350b"
-    ],
-    "build-tags": ["metro_rp2350"],
-    "serial-port": ["239a:814e"],
-    "default-stack-size": 8192,
-    "ldflags": [
-        "--defsym=__flash_size=16M"
-    ]
-}

targets/nano-rp2040.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["2341:005e"],
-    "default-stack-size": 8192,
     "build-tags": ["nano_rp2040", "ninafw", "ninafw_machine_init"],
     "ldflags": [
         "--defsym=__flash_size=16M"

targets/qtpy-rp2040.json

@@ -3,7 +3,6 @@
         "rp2040"
     ],
     "serial-port": ["239a:80f7"],
-    "default-stack-size": 8192,
     "build-tags": ["qtpy_rp2040"],
     "ldflags": [
         "--defsym=__flash_size=8192K"

targets/riscv-qemu.json

@@ -8,7 +8,7 @@
 		"qemu"
 	],
 	"scheduler": "cores",
-	"default-stack-size": 16384,
+	"default-stack-size": 8192,
 	"cflags": [
 		"-march=rv32imaczihintpause",
 		"-DTINYGO_CORES=4"

targets/riscv32.json

@@ -10,8 +10,7 @@
 		"-march=rv32imac"
 	],
 	"ldflags": [
-		"-melf32lriscv",
+		"-melf32lriscv"
-		"-mllvm", "-enable-machine-outliner=never"
 	],
 	"gdb": [
 		"gdb-multiarch",