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// Copyright 2023 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 runtime
import (
"internal/runtime/atomic"
"unsafe"
)
func osinit() {
// https://webassembly.github.io/spec/core/exec/runtime.html#memory-instances
physPageSize = 64 * 1024
initBloc()
ncpu = 1
getg().m.procid = 2
}
const _SIGSEGV = 0xb
func sigpanic() {
gp := getg()
if !canpanic() {
throw("unexpected signal during runtime execution")
}
// js only invokes the exception handler for memory faults.
gp.sig = _SIGSEGV
panicmem()
}
// func exitThread(wait *uint32)
// FIXME: wasm doesn't have atomic yet
func exitThread(wait *atomic.Uint32)
type mOS struct{}
func osyield()
//go:nosplit
func osyield_no_g() {
osyield()
}
type sigset struct{}
// Called to initialize a new m (including the bootstrap m).
// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
func mpreinit(mp *m) {
mp.gsignal = malg(32 * 1024)
mp.gsignal.m = mp
}
//go:nosplit
func usleep_no_g(usec uint32) {
usleep(usec)
}
//go:nosplit
func sigsave(p *sigset) {
}
//go:nosplit
func msigrestore(sigmask sigset) {
}
//go:nosplit
//go:nowritebarrierrec
func clearSignalHandlers() {
}
//go:nosplit
func sigblock(exiting bool) {
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
}
// Called from dropm to undo the effect of an minit.
func unminit() {
}
// Called from exitm, but not from drop, to undo the effect of thread-owned
// resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
func mdestroy(mp *m) {
}
// wasm has no signals
const _NSIG = 0
func signame(sig uint32) string {
return ""
}
func crash() {
*(*int32)(nil) = 0
}
func initsig(preinit bool) {
}
// May run with m.p==nil, so write barriers are not allowed.
//
//go:nowritebarrier
func newosproc(mp *m) {
throw("newosproc: not implemented")
}
//go:linkname os_sigpipe os.sigpipe
func os_sigpipe() {
throw("too many writes on closed pipe")
}
//go:linkname syscall_now syscall.now
func syscall_now() (sec int64, nsec int32) {
sec, nsec, _ = time_now()
return
}
//go:nosplit
func cputicks() int64 {
// runtime┬Ěnanotime() is a poor approximation of CPU ticks that is enough for the profiler.
return nanotime()
}
// gsignalStack is unused on js.
type gsignalStack struct{}
const preemptMSupported = false
func preemptM(mp *m) {
// No threads, so nothing to do.
}
// getfp returns the frame pointer register of its caller or 0 if not implemented.
// TODO: Make this a compiler intrinsic
func getfp() uintptr { return 0 }
func setProcessCPUProfiler(hz int32) {}
func setThreadCPUProfiler(hz int32) {}
func sigdisable(uint32) {}
func sigenable(uint32) {}
func sigignore(uint32) {}
// Stubs so tests can link correctly. These should never be called.
func open(name *byte, mode, perm int32) int32 { panic("not implemented") }
func closefd(fd int32) int32 { panic("not implemented") }
func read(fd int32, p unsafe.Pointer, n int32) int32 { panic("not implemented") }