all: Go 1.21 support

16 files changed, 76 insertions, 20 deletions

diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 51c145f33..2acf285a5 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -27,7 +27,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.4'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v3
@@ -126,7 +126,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.4'
           cache: true
       - name: Build TinyGo
         run: go install
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 05199e21e..1e809bf84 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -18,7 +18,7 @@ jobs:
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.20-alpine
+      image: golang:1.21rc4-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: '1.21.0-rc.4'
           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: '1.21.0-rc.4'
           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: '1.21.0-rc.4'
           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: '1.21.0-rc.4'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v3
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 55e752d70..606394fc9 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -35,7 +35,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.4'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v3
@@ -143,7 +143,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.4'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v2
@@ -173,7 +173,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.4'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v2
@@ -209,7 +209,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.20'
+          go-version: '1.21.0-rc.4'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v2
diff --git a/builder/config.go b/builder/config.go
index 1ca3aa641..82e8cb94e 100644
--- a/builder/config.go
+++ b/builder/config.go
@@ -27,7 +27,7 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 	if err != nil {
 		return nil, 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)
diff --git a/compiler/symbol.go b/compiler/symbol.go
index 3e782dae8..7e712fbae 100644
--- a/compiler/symbol.go
+++ b/compiler/symbol.go
@@ -348,7 +348,7 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 // The list of allowed types is based on this proposal:
 // https://github.com/golang/go/issues/59149
 func (c *compilerContext) checkWasmImport(f *ssa.Function, pragma string) {
-	if c.pkg.Path() == "runtime" {
+	if c.pkg.Path() == "runtime" || c.pkg.Path() == "syscall/js" {
 		// The runtime is a special case. Allow all kinds of parameters
 		// (importantly, including pointers).
 		return
diff --git a/go.mod b/go.mod
index 3aabc46ae..238f474e6 100644
--- a/go.mod
+++ b/go.mod
@@ -31,3 +31,5 @@ require (
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-isatty v0.0.12 // indirect
 )
+
+replace go.bug.st/serial => github.com/deadprogram/go-serial v0.0.0-20230717164825-4529b3232919
diff --git a/go.sum b/go.sum
index 78a7ea867..6c682c1cb 100644
--- a/go.sum
+++ b/go.sum
@@ -12,6 +12,8 @@ github.com/chromedp/sysutil v1.0.0/go.mod h1:kgWmDdq8fTzXYcKIBqIYvRRTnYb9aNS9moA
 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 v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/deadprogram/go-serial v0.0.0-20230717164825-4529b3232919 h1:Hi7G1bCG70NwlyqGswJKEHoIi4hJVN1SsmfwZ+DQHtw=
+github.com/deadprogram/go-serial v0.0.0-20230717164825-4529b3232919/go.mod h1:UABfsluHAiaNI+La2iESysd9Vetq7VRdpxvjx7CmmOE=
 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=
@@ -46,8 +48,6 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3 h1:aQKxg3+2p+IFXXg97McgDGT5zcMrQoi0EICZs8Pgchs=
 github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3/go.mod h1:9/etS5gpQq9BJsJMWg1wpLbfuSnkm8dPF6FdW2JXVhA=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-go.bug.st/serial v1.3.5 h1:k50SqGZCnHZ2MiBQgzccXWG+kd/XpOs1jUljpDDKzaE=
-go.bug.st/serial v1.3.5/go.mod h1:z8CesKorE90Qr/oRSJiEuvzYRKol9r/anJZEb5kt304=
 golang.org/x/mod v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
 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=
diff --git a/src/internal/bytealg/bytealg.go b/src/internal/bytealg/bytealg.go
index a6744c414..72be9ac58 100644
--- a/src/internal/bytealg/bytealg.go
+++ b/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)
+}
diff --git a/src/runtime/baremetal.go b/src/runtime/baremetal.go
index a51191bb9..173d0db25 100644
--- a/src/runtime/baremetal.go
+++ b/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)
 }
 
diff --git a/src/runtime/metrics.go b/src/runtime/metrics.go
new file mode 100644
index 000000000..bd07777db
--- /dev/null
+++ b/src/runtime/metrics.go
@@ -0,0 +1,10 @@
+package runtime
+
+// Implementation of functions needed by runtime/metrics.
+// Mostly just dummy implementations: we don't currently use any of these
+// metrics.
+
+//go:linkname godebug_registerMetric internal/godebug.registerMetric
+func godebug_registerMetric(name string, read func() uint64) {
+	// Dummy function for compatibility with Go 1.21.
+}
diff --git a/src/runtime/runtime.go b/src/runtime/runtime.go
index ceb6a2240..ac7cd25c9 100644
--- a/src/runtime/runtime.go
+++ b/src/runtime/runtime.go
@@ -100,3 +100,27 @@ 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.
+}
+
+// Write to the given file descriptor.
+// This is called from internal/godebug starting with Go 1.21, and only seems to
+// be called with the stderr file descriptor.
+func write(fd uintptr, p unsafe.Pointer, n int32) int32 {
+	if fd == 2 { // stderr
+		// Convert to a string, because we know that p won't change during the
+		// call to printstring.
+		// TODO: use unsafe.String instead once we require Go 1.20.
+		s := _string{
+			ptr:    (*byte)(p),
+			length: uintptr(n),
+		}
+		str := *(*string)(unsafe.Pointer(&s))
+		printstring(str)
+		return n
+	}
+	return 0
+}
diff --git a/src/runtime/runtime_nintendoswitch.go b/src/runtime/runtime_nintendoswitch.go
index f2606023f..bcfa5151d 100644
--- a/src/runtime/runtime_nintendoswitch.go
+++ b/src/runtime/runtime_nintendoswitch.go
@@ -105,7 +105,7 @@ func abort() {
 }
 
 //export write
-func write(fd int32, buf *byte, count int) int {
+func libc_write(fd int32, buf *byte, count int) int {
 	// TODO: Proper handling write
 	for i := 0; i < count; i++ {
 		putchar(*buf)
diff --git a/src/runtime/runtime_wasm_js.go b/src/runtime/runtime_wasm_js.go
index c735c76fc..443ed9e2e 100644
--- a/src/runtime/runtime_wasm_js.go
+++ b/src/runtime/runtime_wasm_js.go
@@ -44,8 +44,8 @@ func nanosecondsToTicks(ns int64) timeUnit {
 // This function is called by the scheduler.
 // Schedule a call to runtime.scheduler, do not actually sleep.
 //
-//export runtime.sleepTicks
+//go:wasmimport gojs runtime.sleepTicks
 func sleepTicks(d timeUnit)
 
-//export runtime.ticks
+//go:wasmimport gojs runtime.ticks
 func ticks() timeUnit
diff --git a/src/runtime/symtab.go b/src/runtime/symtab.go
index cfc9885d7..37c21ee89 100644
--- a/src/runtime/symtab.go
+++ b/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 {
diff --git a/src/syscall/syscall_libc_darwin.go b/src/syscall/syscall_libc_darwin.go
index 704ba29ca..d64f1061f 100644
--- a/src/syscall/syscall_libc_darwin.go
+++ b/src/syscall/syscall_libc_darwin.go
@@ -68,6 +68,7 @@ const (
 	EISDIR      Errno = 21
 	EINVAL      Errno = 22
 	EMFILE      Errno = 24
+	EROFS       Errno = 30
 	EPIPE       Errno = 32
 	EAGAIN      Errno = 35
 	ENOTCONN    Errno = 57
diff --git a/targets/wasm_exec.js b/targets/wasm_exec.js
index 8e29d6266..5dfc67c35 100644
--- a/targets/wasm_exec.js
+++ b/targets/wasm_exec.js
@@ -284,7 +284,7 @@
 						return 0;
 					},
 				},
-				env: {
+				gojs: {
 					// func ticks() float64
 					"runtime.ticks": () => {
 						return timeOrigin + performance.now();
@@ -444,6 +444,10 @@
 					},
 				}
 			};
+
+			// Go 1.20 uses 'env'. Go 1.21 uses 'gojs'.
+			// For compatibility, we use both as long as Go 1.20 is supported.
+			this.importObject.env = this.importObject.gojs;
 		}
 
 		async run(instance) {