File size: 2,926 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | // Copyright 2025 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.
//go:build !plan9 && !windows
package main
// Regression test for https://go.dev/issue/72870. Go code called from C should
// never be reported as external code.
/*
#include <pthread.h>
void go_callback1();
void go_callback2();
static void *callback_pprof_thread(void *arg) {
go_callback1();
return 0;
}
static void c_callback(void) {
go_callback2();
}
static void start_callback_pprof_thread() {
pthread_t th;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_create(&th, &attr, callback_pprof_thread, 0);
// Don't join, caller will watch pprof.
}
*/
import "C"
import (
"bytes"
"fmt"
"internal/profile"
"os"
"runtime/pprof"
"time"
)
func init() {
register("CgoCallbackPprof", CgoCallbackPprof)
}
func CgoCallbackPprof() {
C.start_callback_pprof_thread()
var buf bytes.Buffer
if err := pprof.StartCPUProfile(&buf); err != nil {
fmt.Printf("Error starting CPU profile: %v\n", err)
os.Exit(1)
}
time.Sleep(1 * time.Second)
pprof.StopCPUProfile()
p, err := profile.Parse(&buf)
if err != nil {
fmt.Printf("Error parsing profile: %v\n", err)
os.Exit(1)
}
foundCallee := false
for _, s := range p.Sample {
funcs := flattenFrames(s)
if len(funcs) == 0 {
continue
}
leaf := funcs[0]
if leaf.Name != "main.go_callback1_callee" {
continue
}
foundCallee = true
if len(funcs) < 2 {
fmt.Printf("Profile: %s\n", p)
frames := make([]string, len(funcs))
for i := range funcs {
frames[i] = funcs[i].Name
}
fmt.Printf("FAIL: main.go_callback1_callee sample missing caller in frames %v\n", frames)
os.Exit(1)
}
if funcs[1].Name != "main.go_callback1" {
// In https://go.dev/issue/72870, this will be runtime._ExternalCode.
fmt.Printf("Profile: %s\n", p)
frames := make([]string, len(funcs))
for i := range funcs {
frames[i] = funcs[i].Name
}
fmt.Printf("FAIL: main.go_callback1_callee sample caller got %s want main.go_callback1 in frames %v\n", funcs[1].Name, frames)
os.Exit(1)
}
}
if !foundCallee {
fmt.Printf("Missing main.go_callback1_callee sample in profile %s\n", p)
os.Exit(1)
}
fmt.Printf("OK\n")
}
// Return the frame functions in s, regardless of inlining.
func flattenFrames(s *profile.Sample) []*profile.Function {
ret := make([]*profile.Function, 0, len(s.Location))
for _, loc := range s.Location {
for _, line := range loc.Line {
ret = append(ret, line.Function)
}
}
return ret
}
//export go_callback1
func go_callback1() {
// This is a separate function just to ensure we have another Go
// function as the caller in the profile.
go_callback1_callee()
}
func go_callback1_callee() {
C.c_callback()
// Spin for CPU samples.
for {
}
}
//export go_callback2
func go_callback2() {
}
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