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runtime: show runtime.panic frame in traceback

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Otherwise, if panic starts running deferred functions,
the code that panicked appears to be calling those
functions directly, which is not the case and can be
confusing.

For example:

main.Two()
        /Users/rsc/x.go:12 +0x2a
runtime.panic(0x20dc0, 0x2100cc010)
        /Users/rsc/g/go/src/pkg/runtime/panic.c:248 +0x106
main.One()
        /Users/rsc/x.go:8 +0x55

This makes clear(er) that main.Two is being called during
a panic, not as a direct call from main.One.

Fixes #5832.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13302051
This commit is contained in:
Russ Cox 2013-09-11 11:59:19 -04:00
parent 382738af51
commit fa4984d535
1 changed files with 8 additions and 1 deletions
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9
src/pkg/runtime/symtab.c
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@ -317,10 +317,17 @@ runtime·showframe(Func *f, G *gp)
static int32 traceback = -1;
String name;
if(m->throwing && gp != nil && (gp == m->curg || gp == m->caughtsig))
if(m->throwing > 0 && gp != nil && (gp == m->curg || gp == m->caughtsig))
return 1;
if(traceback < 0)
traceback = runtime·gotraceback(nil);
name = runtime·gostringnocopy((uint8*)runtime·funcname(f));
// Special case: always show runtime.panic frame, so that we can
// see where a panic started in the middle of a stack trace.
// See golang.org/issue/5832.
if(name.len == 7+1+5 && hasprefix(name, "runtime.panic"))
return 1;
return traceback > 1 || f != nil && contains(name, ".") && !hasprefix(name, "runtime.");
}