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in traceback, handle the case where we've called through a nil function pointer

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R=rsc
DELTA=7  (7 added, 0 deleted, 0 changed)
OCL=18372
CL=18372
This commit is contained in:
Rob Pike 2008-11-03 15:22:15 -08:00
parent 250ec1665a
commit 63f38d62ac
1 changed files with 7 additions and 0 deletions
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7
src/runtime/rt2_amd64.c
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@ -25,6 +25,13 @@ traceback(uint8 *pc, uint8 *sp, void* r15)
// store local copy of per-process data block that we can write as we unwind // store local copy of per-process data block that we can write as we unwind
mcpy((byte*)&g, (byte*)r15, sizeof(G)); mcpy((byte*)&g, (byte*)r15, sizeof(G));
// if the PC is zero, it's probably due to a nil function pointer.
// pop the failed frame.
if(pc == nil) {
pc = ((uint8**)sp)[0];
sp += 8;
}
counter = 0; counter = 0;
name = "panic"; name = "panic";
for(;;){ for(;;){