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https://github.com/golang/go
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421c01706f
Gccgo can only get a backtrace for the currently running thread, which means that it can only get a backtrace for goroutines currently running Go code. When a goroutine is running C code, gccgo has no way to stop it and get the backtrace. This test is all about getting a backtrace of goroutines running C code, so it can't work for gccgo. Change-Id: I2dff4403841fb544da7396562ab1193875fc14c3 Reviewed-on: https://go-review.googlesource.com/1904 Reviewed-by: Minux Ma <minux@golang.org>
107 lines
2.7 KiB
Go
107 lines
2.7 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 7978. Stack tracing didn't work during cgo code after calling a Go
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// callback. Make sure GC works and the stack trace is correct.
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package cgotest
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/*
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#include <stdint.h>
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void issue7978cb(void);
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// use ugly atomic variable sync since that doesn't require calling back into
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// Go code or OS dependencies
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static void issue7978c(uint32_t *sync) {
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while(__sync_fetch_and_add(sync, 0) != 0)
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;
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__sync_fetch_and_add(sync, 1);
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while(__sync_fetch_and_add(sync, 0) != 2)
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;
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issue7978cb();
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__sync_fetch_and_add(sync, 1);
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while(__sync_fetch_and_add(sync, 0) != 6)
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;
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}
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*/
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import "C"
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import (
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"os"
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"runtime"
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"strings"
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"sync/atomic"
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"testing"
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)
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var issue7978sync uint32
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func issue7978check(t *testing.T, wantFunc string, badFunc string, depth int) {
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runtime.GC()
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buf := make([]byte, 65536)
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trace := string(buf[:runtime.Stack(buf, true)])
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for _, goroutine := range strings.Split(trace, "\n\n") {
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if strings.Contains(goroutine, "test.issue7978go") {
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trace := strings.Split(goroutine, "\n")
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// look for the expected function in the stack
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for i := 0; i < depth; i++ {
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if badFunc != "" && strings.Contains(trace[1+2*i], badFunc) {
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t.Errorf("bad stack: found %s in the stack:\n%s", badFunc, goroutine)
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return
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}
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if strings.Contains(trace[1+2*i], wantFunc) {
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return
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}
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}
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t.Errorf("bad stack: didn't find %s in the stack:\n%s", wantFunc, goroutine)
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return
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}
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}
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t.Errorf("bad stack: goroutine not found. Full stack dump:\n%s", trace)
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}
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func issue7978wait(store uint32, wait uint32) {
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if store != 0 {
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atomic.StoreUint32(&issue7978sync, store)
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}
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for atomic.LoadUint32(&issue7978sync) != wait {
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runtime.Gosched()
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}
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}
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//export issue7978cb
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func issue7978cb() {
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issue7978wait(3, 4)
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}
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func issue7978go() {
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C.issue7978c((*C.uint32_t)(&issue7978sync))
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issue7978wait(7, 8)
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}
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func test7978(t *testing.T) {
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if runtime.Compiler == "gccgo" {
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t.Skip("gccgo can not do stack traces of C code")
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}
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if os.Getenv("GOTRACEBACK") != "2" {
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t.Fatalf("GOTRACEBACK must be 2")
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}
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issue7978sync = 0
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go issue7978go()
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// test in c code, before callback
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issue7978wait(0, 1)
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issue7978check(t, "runtime.cgocall_errno(", "", 1)
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// test in go code, during callback
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issue7978wait(2, 3)
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issue7978check(t, "test.issue7978cb(", "test.issue7978go", 3)
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// test in c code, after callback
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issue7978wait(4, 5)
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issue7978check(t, "runtime.cgocall_errno(", "runtime.cgocallback", 1)
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// test in go code, after return from cgo
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issue7978wait(6, 7)
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issue7978check(t, "test.issue7978go(", "", 3)
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atomic.StoreUint32(&issue7978sync, 8)
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}
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