// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime_test
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import (
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"runtime"
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"strings"
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"testing"
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)
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func f1(pan bool) []uintptr {
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return f2(pan) // line 14
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}
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func f2(pan bool) []uintptr {
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return f3(pan) // line 18
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}
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func f3(pan bool) []uintptr {
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if pan {
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panic("f3") // line 23
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}
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ret := make([]uintptr, 20)
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return ret[:runtime.Callers(0, ret)] // line 26
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}
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func testCallers(t *testing.T, pcs []uintptr, pan bool) {
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m := make(map[string]int, len(pcs))
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frames := runtime.CallersFrames(pcs)
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for {
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frame, more := frames.Next()
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if frame.Function != "" {
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m[frame.Function] = frame.Line
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}
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if !more {
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break
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}
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}
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var seen []string
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for k := range m {
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seen = append(seen, k)
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}
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t.Logf("functions seen: %s", strings.Join(seen, " "))
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var f3Line int
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if pan {
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f3Line = 23
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} else {
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f3Line = 26
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}
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want := []struct {
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name string
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line int
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}{
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{"f1", 14},
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{"f2", 18},
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{"f3", f3Line},
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}
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for _, w := range want {
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if got := m["runtime_test."+w.name]; got != w.line {
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t.Errorf("%s is line %d, want %d", w.name, got, w.line)
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}
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}
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}
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func TestCallers(t *testing.T) {
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testCallers(t, f1(false), false)
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}
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func TestCallersPanic(t *testing.T) {
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defer func() {
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if r := recover(); r == nil {
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t.Fatal("did not panic")
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}
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pcs := make([]uintptr, 20)
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pcs = pcs[:runtime.Callers(0, pcs)]
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testCallers(t, pcs, true)
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}()
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f1(true)
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}
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