feat:add new target to support wasm freestanding

src/os/dir_other.go

@@ -1,5 +1,5 @@
-//go:build baremetal || js || wasi || windows
-// +build baremetal js wasi windows
+//go:build baremetal || js || wasi || windows || wasm_freestanding
+// +build baremetal js wasi windows wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/dir_unix.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux && !baremetal && !wasi
-// +build linux,!baremetal,!wasi
+//go:build linux && !baremetal && !wasi && !wasm_freestanding
+// +build linux,!baremetal,!wasi,!wasm_freestanding
 
 package os
 

src/os/dirent_linux.go

@@ -1,5 +1,5 @@
-//go:build !baremetal && !js && !wasi
-// +build !baremetal,!js,!wasi
+//go:build !baremetal && !js && !wasi && !wasm_freestanding
+// +build !baremetal,!js,!wasi,!wasm_freestanding
 
 // Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/env_unix_test.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || linux
-// +build darwin linux
+//go:build darwin || (linux && !wasm_freestanding)
+// +build darwin linux,!wasm_freestanding
 
 package os_test
 

src/os/exec_posix.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris || windows
-// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris windows
+//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || (linux && !wasm_freestanding) || netbsd || openbsd || solaris || windows
+// +build aix darwin dragonfly freebsd js,wasm linux,!wasm_freestanding netbsd openbsd solaris windows
 
 package os
 

src/os/executable_other.go

@@ -1,5 +1,5 @@
-//go:build !linux || baremetal
-// +build !linux baremetal
+//go:build !linux || baremetal || wasm_freestanding
+// +build !linux baremetal wasm_freestanding
 
 package os
 

src/os/executable_procfs.go

@@ -4,8 +4,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux && !baremetal
-// +build linux,!baremetal
+//go:build linux && !baremetal && !wasm_freestanding
+// +build linux,!baremetal,!wasm_freestanding
 
 package os
 

src/os/file_anyos.go

@@ -1,5 +1,5 @@
-//go:build !baremetal && !js
-// +build !baremetal,!js
+//go:build !baremetal && !js && !wasm_freestanding
+// +build !baremetal,!js,!wasm_freestanding
 
 // Portions copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/file_anyos_test.go

@@ -1,5 +1,5 @@
-//go:build !baremetal && !js
-// +build !baremetal,!js
+//go:build !baremetal && !js && !wasm_freestanding
+// +build !baremetal,!js,!wasm_freestanding
 
 package os_test
 

src/os/file_other.go

@@ -1,9 +1,10 @@
-//go:build baremetal || (wasm && !wasi)
-// +build baremetal wasm,!wasi
+//go:build baremetal || wasm_freestanding || (wasm && !wasi)
+// +build baremetal wasm_freestanding wasm,!wasi
 
 package os
 
 import (
+	"io"
 	_ "unsafe"
 )
 
@@ -41,11 +42,19 @@ func NewFile(fd uintptr, name string) *File {
 // Read reads up to len(b) bytes from machine.Serial.
 // It returns the number of bytes read and any error encountered.
 func (f stdioFileHandle) Read(b []byte) (n int, err error) {
+	if f != 0 {
+		return 0, ErrUnsupported
+	}
+
 	if len(b) == 0 {
 		return 0, nil
 	}
 
 	size := buffered()
+	if size < 0 {
+		return 0, io.EOF
+	}
+
 	for size == 0 {
 		gosched()
 		size = buffered()

src/os/file_unix.go

@@ -1,5 +1,5 @@
-//go:build darwin || (linux && !baremetal)
-// +build darwin linux,!baremetal
+//go:build darwin || (linux && !baremetal && !wasm_freestanding)
+// +build darwin linux,!baremetal,!wasm_freestanding
 
 // target wasi sets GOOS=linux and thus the +linux build tag,
 // even though it doesn't show up in "tinygo info target -wasi"

src/os/getpagesize_test.go

@@ -1,5 +1,5 @@
-//go:build windows || darwin || (linux && !baremetal)
-// +build windows darwin linux,!baremetal
+//go:build windows || darwin || (linux && !baremetal && !wasm_freestanding)
+// +build windows darwin linux,!baremetal,!wasm_freestanding
 
 package os_test
 

src/os/os_anyos_test.go

@@ -1,5 +1,5 @@
-//go:build windows || darwin || (linux && !baremetal)
-// +build windows darwin linux,!baremetal
+//go:build windows || darwin || (linux && !baremetal && !wasm_freestanding)
+// +build windows darwin linux,!baremetal,!wasm_freestanding
 
 package os_test
 

src/os/os_chmod_test.go

@@ -1,5 +1,5 @@
-//go:build !baremetal && !js && !wasi
-// +build !baremetal,!js,!wasi
+//go:build !baremetal && !js && !wasi && !wasm_freestanding
+// +build !baremetal,!js,!wasi,!wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/os_symlink_test.go

@@ -1,5 +1,5 @@
-//go:build !windows && !baremetal && !js && !wasi
-// +build !windows,!baremetal,!js,!wasi
+//go:build !windows && !baremetal && !js && !wasi && !wasm_freestanding
+// +build !windows,!baremetal,!js,!wasi,!wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/pipe_test.go

@@ -1,5 +1,5 @@
-//go:build windows || darwin || (linux && !baremetal && !wasi)
-// +build windows darwin linux,!baremetal,!wasi
+//go:build windows || darwin || (linux && !baremetal && !wasi && !wasm_freestanding)
+// +build windows darwin linux,!baremetal,!wasi,!wasm_freestanding
 
 // Copyright 2021 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/read_test.go

@@ -1,5 +1,5 @@
-//go:build !baremetal && !js && !wasi
-// +build !baremetal,!js,!wasi
+//go:build !baremetal && !js && !wasi && !wasm_freestanding
+// +build !baremetal,!js,!wasi,!wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/removeall_noat.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !baremetal && !js && !wasi
-// +build !baremetal,!js,!wasi
+//go:build !baremetal && !js && !wasi && !wasm_freestanding
+// +build !baremetal,!js,!wasi,!wasm_freestanding
 
 package os
 

src/os/removeall_other.go

@@ -1,5 +1,5 @@
-//go:build baremetal || js || wasi
-// +build baremetal js wasi
+//go:build baremetal || wasm_freestanding || js || wasi
+// +build baremetal wasm_freestanding js wasi
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/removeall_test.go

@@ -1,5 +1,5 @@
-//go:build darwin || (linux && !baremetal && !js && !wasi)
-// +build darwin linux,!baremetal,!js,!wasi
+//go:build darwin || (linux && !baremetal && !js && !wasi && !wasm_freestanding)
+// +build darwin linux,!baremetal,!js,!wasi,!wasm_freestanding
 
 // TODO: implement ReadDir on windows
 

src/os/seek_unix_bad.go

@@ -1,5 +1,5 @@
-//go:build (linux && !baremetal && 386) || (linux && !baremetal && arm && !wasi)
-// +build linux,!baremetal,386 linux,!baremetal,arm,!wasi
+//go:build (linux && !baremetal && 386) || (linux && !baremetal && arm && !wasi && !wasm_freestanding)
+// +build linux,!baremetal,386 linux,!baremetal,arm,!wasi,!wasm_freestanding
 
 package os
 

src/os/stat_linux.go

@@ -1,5 +1,5 @@
-//go:build linux && !baremetal
-// +build linux,!baremetal
+//go:build linux && !baremetal && !wasm_freestanding
+// +build linux,!baremetal,!wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/stat_other.go

@@ -1,5 +1,5 @@
-//go:build baremetal || (wasm && !wasi)
-// +build baremetal wasm,!wasi
+//go:build baremetal || wasm_freestanding || (wasm && !wasi)
+// +build baremetal wasm_freestanding wasm,!wasi
 
 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/stat_unix.go

@@ -1,5 +1,5 @@
-//go:build darwin || (linux && !baremetal)
-// +build darwin linux,!baremetal
+//go:build darwin || (linux && !baremetal && !wasm_freestanding)
+// +build darwin linux,!baremetal,!wasm_freestanding
 
 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/tempfile.go

@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !wasm_freestanding
+// +build !wasm_freestanding
+
 package os
 
 import (

src/os/tempfile_test.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !baremetal && !js && !wasi
-// +build !baremetal,!js,!wasi
+//go:build !baremetal && !js && !wasi && !wasm_freestanding
+// +build !baremetal,!js,!wasi,!wasm_freestanding
 
 package os_test
 

src/os/types_anyos.go

@@ -1,5 +1,5 @@
-//go:build !baremetal && !js
-// +build !baremetal,!js
+//go:build !baremetal && !js && !wasm_freestanding
+// +build !baremetal,!js,!wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/os/types_unix.go

@@ -1,5 +1,5 @@
-//go:build darwin || (linux && !baremetal)
-// +build darwin linux,!baremetal
+//go:build darwin || (linux && !baremetal && !wasm_freestanding)
+// +build darwin linux,!baremetal,!wasm_freestanding
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style

src/runtime/os_linux.go

@@ -1,5 +1,5 @@
-//go:build linux && !baremetal && !nintendoswitch && !wasi
-// +build linux,!baremetal,!nintendoswitch,!wasi
+//go:build linux && !baremetal && !nintendoswitch && !wasi && !wasm_freestanding
+// +build linux,!baremetal,!nintendoswitch,!wasi,!wasm_freestanding
 
 package runtime
 

src/runtime/os_other.go

@@ -1,6 +1,6 @@
-//go:build linux && (baremetal || nintendoswitch || wasi)
+//go:build linux && (baremetal || nintendoswitch || wasi || wasm_freestanding)
 // +build linux
-// +build baremetal nintendoswitch wasi
+// +build baremetal nintendoswitch wasi wasm_freestanding
 
 // Other systems that aren't operating systems supported by the Go toolchain
 // need to pretend to be an existing operating system. Linux seems like a good

src/runtime/runtime_tinygowasm.go

@@ -1,5 +1,5 @@
-//go:build tinygo.wasm
-// +build tinygo.wasm
+//go:build tinygo.wasm && !wasm_freestanding
+// +build tinygo.wasm,!wasm_freestanding
 
 package runtime
 

src/runtime/runtime_unix.go

@@ -1,5 +1,5 @@
-//go:build (darwin || (linux && !baremetal && !wasi)) && !nintendoswitch
-// +build darwin linux,!baremetal,!wasi
+//go:build (darwin || (linux && !baremetal && !wasi && !wasm_freestanding)) && !nintendoswitch
+// +build darwin linux,!baremetal,!wasi,!wasm_freestanding
 // +build !nintendoswitch
 
 package runtime

src/runtime/runtime_wasm_freestanding.go

@@ -0,0 +1,78 @@
+//go:build wasm_freestanding
+// +build wasm_freestanding
+
+package runtime
+
+import (
+	"unsafe"
+)
+
+//export _start
+func _start() {
+	// These need to be initialized early so that the heap can be initialized.
+	heapStart = uintptr(unsafe.Pointer(&heapStartSymbol))
+	heapEnd = uintptr(wasm_memory_size(0) * wasmPageSize)
+	run()
+}
+
+// Abort executes the wasm 'unreachable' instruction.
+func abort() {
+	trap()
+}
+
+//go:linkname os_runtime_args os.runtime_args
+func os_runtime_args() []string {
+	return []string{}
+}
+
+//go:linkname syscall_runtime_envs syscall.runtime_envs
+func syscall_runtime_envs() []string {
+	return []string{}
+}
+
+func putchar(c byte) {
+}
+
+func getchar() byte {
+	return 0
+}
+
+func buffered() int {
+	return -1
+}
+
+type timeUnit int64
+
+func ticksToNanoseconds(ticks timeUnit) int64 {
+	panic("unimplemented: ticksToNanoseconds")
+}
+
+func nanosecondsToTicks(ns int64) timeUnit {
+	panic("unimplemented: nanosecondsToTicks")
+}
+
+func sleepTicks(d timeUnit) {
+	panic("unimplemented: sleepTicks")
+}
+
+func ticks() timeUnit {
+	panic("unimplemented: ticks")
+}
+
+//go:linkname now time.now
+func now() (int64, int32, int64) {
+	panic("unimplemented: now")
+}
+
+//go:linkname syscall_Exit syscall.Exit
+func syscall_Exit(code int) {
+	return
+}
+
+//go:linkname procPin sync/atomic.runtime_procPin
+func procPin() {
+}
+
+//go:linkname procUnpin sync/atomic.runtime_procUnpin
+func procUnpin() {
+}

src/runtime/runtime_wasm_js.go

@@ -1,5 +1,5 @@
-//go:build wasm && !wasi
-// +build wasm,!wasi
+//go:build wasm && !wasi && !wasm_freestanding
+// +build wasm,!wasi,!wasm_freestanding
 
 package runtime
 

src/runtime/runtime_wasm_js_scheduler.go

@@ -1,5 +1,5 @@
-//go:build wasm && !wasi && !scheduler.none
-// +build wasm,!wasi,!scheduler.none
+//go:build wasm && !wasi && !wasm_freestanding && !scheduler.none
+// +build wasm,!wasi,!wasm_freestanding,!scheduler.none
 
 package runtime