all: Go 1.21 support

.github/workflows/linux.yml

@@ -18,7 +18,7 @@ jobs:
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.20-alpine
+      image: golang:1.21-alpine
     steps:
       - name: Install apk dependencies
         # tar: needed for actions/cache@v3
@@ -135,7 +135,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           cache: true
       - name: Install wasmtime
         run: |
@@ -177,7 +177,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           cache: true
       - name: Install Node.js
         uses: actions/setup-node@v3
@@ -290,7 +290,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v3
@@ -407,7 +407,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v3

builder/config.go

@@ -33,7 +33,7 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 	if err != nil {
 		return nil, fmt.Errorf("could not read version from GOROOT (%v): %v", goroot, err)
 	}
-	if major != 1 || minor < 18 || minor > 20 {
+	if major != 1 || minor < 18 || minor > 21 {
 		// Note: when this gets updated, also update the Go compatibility matrix:
 		// https://github.com/tinygo-org/tinygo-site/blob/dev/content/docs/reference/go-compat-matrix.md
 		return nil, fmt.Errorf("requires go version 1.18 through 1.20, got go%d.%d", major, minor)

src/internal/bytealg/bytealg.go

@@ -251,3 +251,13 @@ func IndexRabinKarp(s, substr string) int {
 	}
 	return -1
 }
+
+// MakeNoZero makes a slice of length and capacity n without zeroing the bytes.
+// It is the caller's responsibility to ensure uninitialized bytes
+// do not leak to the end user.
+func MakeNoZero(n int) []byte {
+	// Note: this does zero the buffer even though that's not necessary.
+	// For performance reasons we might want to change this (similar to the
+	// malloc function implemented in the runtime).
+	return make([]byte, n)
+}

src/runtime/baremetal.go

@@ -38,6 +38,8 @@ func growHeap() bool {
 
 //export malloc
 func libc_malloc(size uintptr) unsafe.Pointer {
+	// Note: this zeroes the returned buffer which is not necessary.
+	// The same goes for bytealg.MakeNoZero.
 	return alloc(size, nil)
 }
 

src/runtime/runtime.go

@@ -100,3 +100,8 @@ func godebug_setUpdate(update func(string, string)) {
 	// variable changes (for example, via os.Setenv).
 	godebugUpdate = update
 }
+
+//go:linkname godebug_setNewIncNonDefault internal/godebug.setNewIncNonDefault
+func godebug_setNewIncNonDefault(newIncNonDefault func(string) func()) {
+	// Dummy function necessary in Go 1.21.
+}

src/runtime/symtab.go

@@ -5,11 +5,14 @@ type Frames struct {
 }
 
 type Frame struct {
+	PC uintptr
+
+	Func *Func
+
 	Function string
 
 	File string
 	Line int
-	PC   uintptr
 }
 
 func CallersFrames(callers []uintptr) *Frames {