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| 1 | +// Copyright 2014 The Go Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +// Issue 7978. Stack tracing didn't work during cgo code after calling a Go |
| 6 | +// callback. Make sure GC works and the stack trace is correct. |
| 7 | + |
| 8 | +package cgotest |
| 9 | + |
| 10 | +/* |
| 11 | +#include <stdint.h> |
| 12 | +
|
| 13 | +void issue7978cb(void); |
| 14 | +
|
| 15 | +// use ugly atomic variable sync since that doesn't require calling back into |
| 16 | +// Go code or OS dependencies |
| 17 | +static void issue7978c(uint32_t *sync) { |
| 18 | + while(__sync_fetch_and_add(sync, 0) != 0) |
| 19 | + ; |
| 20 | + __sync_fetch_and_add(sync, 1); |
| 21 | + while(__sync_fetch_and_add(sync, 0) != 2) |
| 22 | + ; |
| 23 | + issue7978cb(); |
| 24 | + __sync_fetch_and_add(sync, 1); |
| 25 | + while(__sync_fetch_and_add(sync, 0) != 6) |
| 26 | + ; |
| 27 | +} |
| 28 | +*/ |
| 29 | +import "C" |
| 30 | + |
| 31 | +import ( |
| 32 | + "os" |
| 33 | + "runtime" |
| 34 | + "strings" |
| 35 | + "sync/atomic" |
| 36 | + "testing" |
| 37 | +) |
| 38 | + |
| 39 | +var issue7978sync uint32 |
| 40 | + |
| 41 | +func issue7978check(t *testing.T, wantFunc string, badFunc string, depth int) { |
| 42 | + runtime.GC() |
| 43 | + buf := make([]byte, 65536) |
| 44 | + trace := string(buf[:runtime.Stack(buf, true)]) |
| 45 | + for _, goroutine := range strings.Split(trace, "\n\n") { |
| 46 | + if strings.Contains(goroutine, "test.issue7978go") { |
| 47 | + trace := strings.Split(goroutine, "\n") |
| 48 | + // look for the expected function in the stack |
| 49 | + for i := 0; i < depth; i++ { |
| 50 | + if badFunc != "" && strings.Contains(trace[1+2*i], badFunc) { |
| 51 | + t.Errorf("bad stack: found %s in the stack:\n%s", badFunc, goroutine) |
| 52 | + return |
| 53 | + } |
| 54 | + if strings.Contains(trace[1+2*i], wantFunc) { |
| 55 | + return |
| 56 | + } |
| 57 | + } |
| 58 | + t.Errorf("bad stack: didn't find %s in the stack:\n%s", wantFunc, goroutine) |
| 59 | + return |
| 60 | + } |
| 61 | + } |
| 62 | + t.Errorf("bad stack: goroutine not found. Full stack dump:\n%s", trace) |
| 63 | +} |
| 64 | + |
| 65 | +func issue7978wait(store uint32, wait uint32) { |
| 66 | + if store != 0 { |
| 67 | + atomic.StoreUint32(&issue7978sync, store) |
| 68 | + } |
| 69 | + for atomic.LoadUint32(&issue7978sync) != wait { |
| 70 | + runtime.Gosched() |
| 71 | + } |
| 72 | +} |
| 73 | + |
| 74 | +//export issue7978cb |
| 75 | +func issue7978cb() { |
| 76 | + issue7978wait(3, 4) |
| 77 | +} |
| 78 | + |
| 79 | +func issue7978go() { |
| 80 | + C.issue7978c((*C.uint32_t)(&issue7978sync)) |
| 81 | + issue7978wait(7, 8) |
| 82 | +} |
| 83 | + |
| 84 | +func test7978(t *testing.T) { |
| 85 | + if os.Getenv("GOTRACEBACK") != "2" { |
| 86 | + t.Fatal("GOTRACEBACK must be 2") |
| 87 | + } |
| 88 | + issue7978sync = 0 |
| 89 | + go issue7978go() |
| 90 | + // test in c code, before callback |
| 91 | + issue7978wait(0, 1) |
| 92 | + issue7978check(t, "runtime.cgocall(", "", 1) |
| 93 | + // test in go code, during callback |
| 94 | + issue7978wait(2, 3) |
| 95 | + issue7978check(t, "test.issue7978cb(", "test.issue7978go", 4) |
| 96 | + // test in c code, after callback |
| 97 | + issue7978wait(4, 5) |
| 98 | + issue7978check(t, "runtime.cgocall(", "runtime.cgocallback", 1) |
| 99 | + // test in go code, after return from cgo |
| 100 | + issue7978wait(6, 7) |
| 101 | + issue7978check(t, "test.issue7978go(", "", 4) |
| 102 | + atomic.StoreUint32(&issue7978sync, 8) |
| 103 | +} |
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