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runtime: allow copying of onM frame

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Currently goroutines in onM can't be copied/shrunk
(including the very goroutine that triggers GC).
Special case onM to allow copying.

LGTM=daniel.morsing, khr
R=golang-codereviews, daniel.morsing, khr, rsc
CC=golang-codereviews, rlh
https://golang.org/cl/124550043
This commit is contained in:
Dmitriy Vyukov 2014-08-19 14:24:03 +04:00
parent 266d350f5e
commit 9198ed4bd6
1 changed files with 10 additions and 1 deletions
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11
src/pkg/runtime/stack.c
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@ -399,6 +399,7 @@ struct CopyableInfo {
};
void runtime·main(void);
void runtime·switchtoM(void(*)(void));
static bool
checkframecopy(Stkframe *frame, void *arg)
@ -424,6 +425,13 @@ checkframecopy(Stkframe *frame, void *arg)
cinfo->frames++;
return false; // stop traceback
}
if(f->entry == (uintptr)runtime·switchtoM) {
// A special routine at the bottom of stack of a goroutine that does onM call.
// We will allow it to be copied even though we don't
// have full GC info for it (because it is written in asm).
cinfo->frames++;
return true;
}
if(frame->varp != (byte*)frame->sp) { // not in prologue (and has at least one local or outarg)
stackmap = runtime·funcdata(f, FUNCDATA_LocalsPointerMaps);
if(stackmap == nil) {
@ -648,7 +656,8 @@ adjustframe(Stkframe *frame, void *arg)
f = frame->fn;
if(StackDebug >= 2)
runtime·printf(" adjusting %s frame=[%p,%p] pc=%p continpc=%p\n", runtime·funcname(f), frame->sp, frame->fp, frame->pc, frame->continpc);
if(f->entry == (uintptr)runtime·main)
if(f->entry == (uintptr)runtime·main ||
f->entry == (uintptr)runtime·switchtoM)
return true;
targetpc = frame->continpc;
if(targetpc == 0) {