WIP wasip1: add Boehm GC support

Author: aykevl

GNUmakefile

@@ -264,7 +264,7 @@ endif
 wasi-libc: lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a
 lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a:
 	@if [ ! -e lib/wasi-libc/Makefile ]; then echo "Submodules have not been downloaded. Please download them using:\n  git submodule update --init"; exit 1; fi
-	cd lib/wasi-libc && $(MAKE) -j4 EXTRA_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" MALLOC_IMPL=none CC="$(CLANG)" AR=$(LLVM_AR) NM=$(LLVM_NM)
+	cd lib/wasi-libc && $(MAKE) -j4 EXTRA_CFLAGS="-O2 -g -DNDEBUG -mnontrapping-fptoint -msign-ext" CC="$(CLANG)" AR=$(LLVM_AR) NM=$(LLVM_NM)
 
 # Generate WASI syscall bindings
 WASM_TOOLS_MODULE=github.com/bytecodealliance/wasm-tools-go

builder/build.go

@@ -169,6 +169,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 		defer unlock()
 		libcDependencies = append(libcDependencies, libcJob)
 	case "wasi-libc":
+		libcJob = dummyCompileJob("")
 		path := filepath.Join(root, "lib/wasi-libc/sysroot/lib/wasm32-wasi/libc.a")
 		if _, err := os.Stat(path); errors.Is(err, fs.ErrNotExist) {
 			return BuildResult{}, errors.New("could not find wasi-libc, perhaps you need to run `make wasi-libc`?")

compileopts/config.go

@@ -122,7 +122,7 @@ func (c *Config) GC() string {
 // that can be traced by the garbage collector.
 func (c *Config) NeedsStackObjects() bool {
 	switch c.GC() {
-	case "conservative", "custom", "precise":
+	case "conservative", "custom", "precise", "boehm":
 		for _, tag := range c.BuildTags() {
 			if tag == "tinygo.wasm" {
 				return true

go.mod

@@ -3,7 +3,7 @@ module github.com/tinygo-org/tinygo
 go 1.19
 
 require (
-	github.com/aykevl/go-wasm v0.0.2-0.20240825160117-b76c3f9f0982
+	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

go.sum

@@ -1,5 +1,5 @@
-github.com/aykevl/go-wasm v0.0.2-0.20240825160117-b76c3f9f0982 h1:cD7QfvrJdYmBw2tFP/VyKPT8ZESlcrwSwo7SvH9Y4dc=
-github.com/aykevl/go-wasm v0.0.2-0.20240825160117-b76c3f9f0982/go.mod h1:7sXyiaA0WtSogCu67R2252fQpVmJMh9JWJ9ddtGkpWw=
+github.com/aykevl/go-wasm v0.0.2-0.20250317121156-42b86c494139 h1:2O/WuAt8J5id3khcAtVB90czG80m+v0sfkLE07GrCVg=
+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=

lib/bdwgc

@@ -1,4 +1,4 @@
-//go:build tinygo.wasm && !(custommalloc || wasm_unknown)
+//go:build tinygo.wasm && !(custommalloc || wasm_unknown || gc.boehm)
 
 package runtime
 

src/runtime/arch_tinygowasm_malloc.go

@@ -1,4 +1,4 @@
-//go:build (gc.conservative || gc.custom || gc.precise) && tinygo.wasm
+//go:build (gc.conservative || gc.custom || gc.precise || gc.boehm) && tinygo.wasm
 
 package runtime
 

src/runtime/gc_stack_portable.go

@@ -8,7 +8,7 @@
 	"linker":        "wasm-ld",
 	"libc":          "wasi-libc",
 	"rtlib":         "compiler-rt",
-	"gc":            "precise",
+	"gc":            "boehm",
 	"scheduler":     "asyncify",
 	"default-stack-size": 65536,
 	"cflags": [
@@ -23,7 +23,8 @@
 		"--no-demangle"
 	],
 	"extra-files": [
-		"src/runtime/asm_tinygowasm.S"
+		"src/runtime/asm_tinygowasm.S",
+		"src/runtime/gc_boehm.c"
 	],
 	"emulator":      "wasmtime run --dir={tmpDir}::/tmp {}"
 }