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runtime: introduce GOTRACEBACK=single, now the default

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Abandon (but still support) the old numbering system.

GOTRACEBACK=none is old 0
GOTRACEBACK=single is the new behavior
GOTRACEBACK=all is old 1
GOTRACEBACK=system is old 2
GOTRACEBACK=crash is unchanged

See doc comment change in runtime1.go for details.

Filed #13107 to decide whether to change default back to GOTRACEBACK=all for Go 1.6 release.
If you run into programs where printing only the current goroutine omits
needed information, please add details in a comment on that issue.

Fixes #12366.

Change-Id: I82ca8b99b5d86dceb3f7102d38d2659d45dbe0db
Reviewed-on: https://go-review.googlesource.com/16512
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Russ Cox 2015-10-30 11:03:02 -04:00
parent 845878a213
commit bf1de1b141
11 changed files with 78 additions and 55 deletions
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4
src/runtime/signal_arm.go
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@ -126,8 +126,8 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
}
print("\n")
var docrash bool
if gotraceback(&docrash) > 0 {
level, _, docrash := gotraceback()
if level > 0 {
goroutineheader(gp)
tracebacktrap(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.lr()), gp)
if crashing > 0 && gp != _g_.m.curg && _g_.m.curg != nil && readgstatus(_g_.m.curg)&^_Gscan == _Grunning {