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
|
// Copyright 2016 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.
package runtime_test
import (
"runtime"
"strings"
"testing"
)
func f1(pan bool) []uintptr {
return f2(pan) // line 14
}
func f2(pan bool) []uintptr {
return f3(pan) // line 18
}
func f3(pan bool) []uintptr {
if pan {
panic("f3") // line 23
}
ret := make([]uintptr, 20)
return ret[:runtime.Callers(0, ret)] // line 26
}
func testCallers(t *testing.T, pcs []uintptr, pan bool) {
m := make(map[string]int, len(pcs))
frames := runtime.CallersFrames(pcs)
for {
frame, more := frames.Next()
if frame.Function != "" {
m[frame.Function] = frame.Line
}
if !more {
break
}
}
var seen []string
for k := range m {
seen = append(seen, k)
}
t.Logf("functions seen: %s", strings.Join(seen, " "))
var f3Line int
if pan {
f3Line = 23
} else {
f3Line = 26
}
want := []struct {
name string
line int
}{
{"f1", 14},
{"f2", 18},
{"f3", f3Line},
}
for _, w := range want {
if got := m["runtime_test."+w.name]; got != w.line {
t.Errorf("%s is line %d, want %d", w.name, got, w.line)
}
}
}
func TestCallers(t *testing.T) {
testCallers(t, f1(false), false)
}
func TestCallersPanic(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Fatal("did not panic")
}
pcs := make([]uintptr, 20)
pcs = pcs[:runtime.Callers(0, pcs)]
testCallers(t, pcs, true)
}()
f1(true)
}
|
