1// Copyright 2019 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// Make sure tracebacks from initialization code are reported correctly.
6
7package a
8
9import (
10	"fmt"
11	"runtime"
12	"strings"
13)
14
15var x = f() // line 15
16
17func f() int {
18	var b [4096]byte
19	n := runtime.Stack(b[:], false) // line 19
20	s := string(b[:n])
21	var pcs [10]uintptr
22	n = runtime.Callers(1, pcs[:]) // line 22
23
24	// Check the Stack results.
25	if debug {
26		println(s)
27	}
28	if strings.Contains(s, "autogenerated") {
29		panic("autogenerated code in traceback")
30	}
31	if !strings.Contains(s, "a.go:15") {
32		panic("missing a.go:15")
33	}
34	if !strings.Contains(s, "a.go:19") {
35		panic("missing a.go:19")
36	}
37	if !strings.Contains(s, "a.init") {
38		panic("missing a.init")
39	}
40
41	// Check the CallersFrames results.
42	if debug {
43		iter := runtime.CallersFrames(pcs[:n])
44		for {
45			f, more := iter.Next()
46			fmt.Printf("%s %s:%d\n", f.Function, f.File, f.Line)
47			if !more {
48				break
49			}
50		}
51	}
52	iter := runtime.CallersFrames(pcs[:n])
53	f, more := iter.Next()
54	if f.Function != "test/a.f" || !strings.HasSuffix(f.File, "a.go") || f.Line != 22 {
55		panic(fmt.Sprintf("bad f %v\n", f))
56	}
57	if !more {
58		panic("traceback truncated after f")
59	}
60	f, more = iter.Next()
61	if f.Function != "test/a.init" || !strings.HasSuffix(f.File, "a.go") || f.Line != 15 {
62		panic(fmt.Sprintf("bad init %v\n", f))
63	}
64	if !more {
65		panic("traceback truncated after init")
66	}
67	f, _ = iter.Next()
68	if !strings.HasPrefix(f.Function, "runtime.") {
69		panic("runtime. driver missing")
70	}
71
72	return 0
73}
74
75const debug = false
76