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runtime: factor out usesLibcall

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Rather than inline lists of GOOS values, factor out the code that checks
if a runtime makes system calls via libcall.

Change-Id: Ib19d7e63a2b4b8314f1841c0ff26e1b3a16b4b22
Reviewed-on: https://go-review.googlesource.com/c/go/+/259239
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-10-04 01:44:41 +10:00
parent 9fed39d281
commit 61debffd97
1 changed files with 11 additions and 1 deletions
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12
src/runtime/proc.go
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@ -1206,6 +1206,16 @@ func startTheWorldWithSema(emitTraceEvent bool) int64 {
return startTime
}
// usesLibcall indicates whether this runtime performs system calls
// via libcall.
func usesLibcall() bool {
switch GOOS {
case "aix", "darwin", "illumos", "ios", "solaris", "windows":
return true
}
return false
}
// mStackIsSystemAllocated indicates whether this runtime starts on a
// system-allocated stack.
func mStackIsSystemAllocated() bool {
@ -4481,7 +4491,7 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
// Normal traceback is impossible or has failed.
// See if it falls into several common cases.
n = 0
if (GOOS == "windows" || GOOS == "solaris" || GOOS == "illumos" || GOOS == "darwin" || GOOS == "ios" || GOOS == "aix") && mp.libcallg != 0 && mp.libcallpc != 0 && mp.libcallsp != 0 {
if usesLibcall() && mp.libcallg != 0 && mp.libcallpc != 0 && mp.libcallsp != 0 {
// Libcall, i.e. runtime syscall on windows.
// Collect Go stack that leads to the call.
n = gentraceback(mp.libcallpc, mp.libcallsp, 0, mp.libcallg.ptr(), 0, &stk[0], len(stk), nil, nil, 0)