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| author | Ian Lance Taylor <iant@golang.org> | 2015-12-11 17:16:48 -0800 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2016-04-01 04:13:44 +0000 |
| commit | ea306ae625d001a43ef20163739593a21be51f97 (patch) | |
| tree | 9123485cd4112995217584ee66e39c6f584533b2 /src/runtime/cgocall.go | |
| parent | b64f549ba95fb9115afb1db8ae594b9442c45a6e (diff) | |
| download | go-ea306ae625d001a43ef20163739593a21be51f97.tar.gz go-ea306ae625d001a43ef20163739593a21be51f97.zip | |
runtime: support symbolic backtrace of C code in a cgo crash
The new function runtime.SetCgoTraceback may be used to register stack
traceback and symbolizer functions, written in C, to do a stack
traceback from cgo code.
There is a sample implementation of runtime.SetCgoSymbolizer at
github.com/ianlancetaylor/cgosymbolizer. Just importing that package is
sufficient to get symbolic C backtraces.
Currently only supported on linux/amd64.
Change-Id: If96ee2eb41c6c7379d407b9561b87557bfe47341
Reviewed-on: https://go-review.googlesource.com/17761
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime/cgocall.go')
| -rw-r--r-- | src/runtime/cgocall.go | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/runtime/cgocall.go b/src/runtime/cgocall.go index 7a683d7524..7cffa83617 100644 --- a/src/runtime/cgocall.go +++ b/src/runtime/cgocall.go @@ -84,6 +84,10 @@ import ( "unsafe" ) +// Addresses collected in a cgo backtrace when crashing. +// Length must match arg.Max in x_cgo_callers in runtime/cgo/gcc_traceback.c. +type cgoCallers [32]uintptr + // Call from Go to C. //go:nosplit func cgocall(fn, arg unsafe.Pointer) int32 { @@ -109,6 +113,14 @@ func cgocall(fn, arg unsafe.Pointer) int32 { mp.ncgo++ defer endcgo(mp) + // Allocate memory to hold a cgo traceback if the cgo call crashes. + if mp.cgoCallers == nil { + mp.cgoCallers = new(cgoCallers) + } + + // Reset traceback. + mp.cgoCallers[0] = 0 + /* * Announce we are entering a system call * so that the scheduler knows to create another |