mirror of
https://github.com/golang/go
synced 2024-11-05 20:16:13 -07:00
9f1a7192dc
Previously, test7978 failed if the user did not invoke it with GOTRACEBACK=2 already set in their environment. Environment-sensitive test are awkward, and in this case there is a very simple workaround: set the traceback level to the necessary value explicitly. Change-Id: I7d576f24138aa8a41392148eae11bbeaef558573 Reviewed-on: https://go-review.googlesource.com/63275 Run-TryBot: Bryan Mills <bcmills@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Issue 7978. Stack tracing didn't work during cgo code after calling a Go
|
|
// callback. Make sure GC works and the stack trace is correct.
|
|
|
|
package cgotest
|
|
|
|
/*
|
|
#include <stdint.h>
|
|
|
|
void issue7978cb(void);
|
|
|
|
#if defined(__APPLE__) && defined(__arm__)
|
|
// on Darwin/ARM, libSystem doesn't provide implementation of the __sync_fetch_and_add
|
|
// primitive, and although gcc supports it, it doesn't inline its definition.
|
|
// Clang could inline its definition, so we require clang on Darwin/ARM.
|
|
#if defined(__clang__)
|
|
#define HAS_SYNC_FETCH_AND_ADD 1
|
|
#else
|
|
#define HAS_SYNC_FETCH_AND_ADD 0
|
|
#endif
|
|
#else
|
|
#define HAS_SYNC_FETCH_AND_ADD 1
|
|
#endif
|
|
|
|
// use ugly atomic variable sync since that doesn't require calling back into
|
|
// Go code or OS dependencies
|
|
static void issue7978c(uint32_t *sync) {
|
|
#if HAS_SYNC_FETCH_AND_ADD
|
|
while(__sync_fetch_and_add(sync, 0) != 0)
|
|
;
|
|
__sync_fetch_and_add(sync, 1);
|
|
while(__sync_fetch_and_add(sync, 0) != 2)
|
|
;
|
|
issue7978cb();
|
|
__sync_fetch_and_add(sync, 1);
|
|
while(__sync_fetch_and_add(sync, 0) != 6)
|
|
;
|
|
#endif
|
|
}
|
|
*/
|
|
import "C"
|
|
|
|
import (
|
|
"runtime"
|
|
"runtime/debug"
|
|
"strings"
|
|
"sync/atomic"
|
|
"testing"
|
|
)
|
|
|
|
var issue7978sync uint32
|
|
|
|
func issue7978check(t *testing.T, wantFunc string, badFunc string, depth int) {
|
|
runtime.GC()
|
|
buf := make([]byte, 65536)
|
|
trace := string(buf[:runtime.Stack(buf, true)])
|
|
for _, goroutine := range strings.Split(trace, "\n\n") {
|
|
if strings.Contains(goroutine, "test.issue7978go") {
|
|
trace := strings.Split(goroutine, "\n")
|
|
// look for the expected function in the stack
|
|
for i := 0; i < depth; i++ {
|
|
if badFunc != "" && strings.Contains(trace[1+2*i], badFunc) {
|
|
t.Errorf("bad stack: found %s in the stack:\n%s", badFunc, goroutine)
|
|
return
|
|
}
|
|
if strings.Contains(trace[1+2*i], wantFunc) {
|
|
return
|
|
}
|
|
}
|
|
t.Errorf("bad stack: didn't find %s in the stack:\n%s", wantFunc, goroutine)
|
|
return
|
|
}
|
|
}
|
|
t.Errorf("bad stack: goroutine not found. Full stack dump:\n%s", trace)
|
|
}
|
|
|
|
func issue7978wait(store uint32, wait uint32) {
|
|
if store != 0 {
|
|
atomic.StoreUint32(&issue7978sync, store)
|
|
}
|
|
for atomic.LoadUint32(&issue7978sync) != wait {
|
|
runtime.Gosched()
|
|
}
|
|
}
|
|
|
|
//export issue7978cb
|
|
func issue7978cb() {
|
|
// Force a stack growth from the callback to put extra
|
|
// pressure on the runtime. See issue #17785.
|
|
growStack(64)
|
|
issue7978wait(3, 4)
|
|
}
|
|
|
|
func growStack(n int) int {
|
|
var buf [128]int
|
|
if n == 0 {
|
|
return 0
|
|
}
|
|
return buf[growStack(n-1)]
|
|
}
|
|
|
|
func issue7978go() {
|
|
C.issue7978c((*C.uint32_t)(&issue7978sync))
|
|
issue7978wait(7, 8)
|
|
}
|
|
|
|
func test7978(t *testing.T) {
|
|
if runtime.Compiler == "gccgo" {
|
|
t.Skip("gccgo can not do stack traces of C code")
|
|
}
|
|
if C.HAS_SYNC_FETCH_AND_ADD == 0 {
|
|
t.Skip("clang required for __sync_fetch_and_add support on darwin/arm")
|
|
}
|
|
debug.SetTraceback("2")
|
|
issue7978sync = 0
|
|
go issue7978go()
|
|
// test in c code, before callback
|
|
issue7978wait(0, 1)
|
|
issue7978check(t, "_Cfunc_issue7978c(", "", 1)
|
|
// test in go code, during callback
|
|
issue7978wait(2, 3)
|
|
issue7978check(t, "test.issue7978cb(", "test.issue7978go", 3)
|
|
// test in c code, after callback
|
|
issue7978wait(4, 5)
|
|
issue7978check(t, "_Cfunc_issue7978c(", "_cgoexpwrap", 1)
|
|
// test in go code, after return from cgo
|
|
issue7978wait(6, 7)
|
|
issue7978check(t, "test.issue7978go(", "", 3)
|
|
atomic.StoreUint32(&issue7978sync, 8)
|
|
}
|