// Copyright 2017 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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"fmt"
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"runtime"
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"strings"
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)
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func ExampleFrames() {
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c := func() {
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// Ask runtime.Callers for up to 10 pcs, including runtime.Callers itself.
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pc := make([]uintptr, 10)
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n := runtime.Callers(0, pc)
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if n == 0 {
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// No pcs available. Stop now.
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// This can happen if the first argument to runtime.Callers is large.
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return
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}
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pc = pc[:n] // pass only valid pcs to runtime.CallersFrames
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frames := runtime.CallersFrames(pc)
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// Loop to get frames.
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// A fixed number of pcs can expand to an indefinite number of Frames.
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for {
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frame, more := frames.Next()
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// To keep this example's output stable
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// even if there are changes in the testing package,
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// stop unwinding when we leave package runtime.
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if !strings.Contains(frame.File, "runtime/") {
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break
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}
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fmt.Printf("- more:%v | %s\n", more, frame.Function)
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if !more {
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break
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}
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}
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}
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b := func() { c() }
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a := func() { b() }
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a()
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// Output:
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// - more:true | runtime.Callers
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// - more:true | runtime_test.ExampleFrames.func1
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// - more:true | runtime_test.ExampleFrames.func2
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// - more:true | runtime_test.ExampleFrames.func3
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// - more:true | runtime_test.ExampleFrames
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}
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