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https://github.com/golang/go
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956879dd0b
Returning the innermost frame instead of the outermost
makes code that walks the results of runtime.Caller{,s}
still work correctly in the presence of mid-stack inlining.
Fixes #29582
Change-Id: I2392e3dd5636eb8c6f58620a61cef2194fe660a7
Reviewed-on: https://go-review.googlesource.com/c/156364
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
95 lines
1.9 KiB
Go
95 lines
1.9 KiB
Go
// run -gcflags=-l=4
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// 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 main
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import (
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"fmt"
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"runtime"
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)
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var skip int
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var npcs int
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var pcs = make([]uintptr, 32)
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func f() {
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g()
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}
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func g() {
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h()
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}
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func h() {
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npcs = runtime.Callers(skip, pcs)
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}
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func testCallers(skp int) (frames []string) {
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skip = skp
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f()
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for i := 0; i < npcs; i++ {
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fn := runtime.FuncForPC(pcs[i] - 1)
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frames = append(frames, fn.Name())
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if fn.Name() == "main.main" {
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break
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}
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}
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return
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}
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func testCallersFrames(skp int) (frames []string) {
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skip = skp
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f()
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callers := pcs[:npcs]
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ci := runtime.CallersFrames(callers)
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for {
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frame, more := ci.Next()
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frames = append(frames, frame.Function)
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if !more || frame.Function == "main.main" {
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break
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}
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}
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return
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}
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var expectedFrames [][]string = [][]string{
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0: {"runtime.Callers", "main.h", "main.g", "main.f", "main.testCallers", "main.main"},
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1: {"main.h", "main.g", "main.f", "main.testCallers", "main.main"},
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2: {"main.g", "main.f", "main.testCallers", "main.main"},
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3: {"main.f", "main.testCallers", "main.main"},
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4: {"main.testCallers", "main.main"},
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5: {"main.main"},
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}
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var allFrames = []string{"runtime.Callers", "main.h", "main.g", "main.f", "main.testCallersFrames", "main.main"}
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func same(xs, ys []string) bool {
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if len(xs) != len(ys) {
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return false
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}
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for i := range xs {
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if xs[i] != ys[i] {
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return false
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}
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}
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return true
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}
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func main() {
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for i := 0; i <= 5; i++ {
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frames := testCallers(i)
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expected := expectedFrames[i]
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if !same(frames, expected) {
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fmt.Printf("testCallers(%d):\n got %v\n want %v\n", i, frames, expected)
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}
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frames = testCallersFrames(i)
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expected = allFrames[i:]
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if !same(frames, expected) {
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fmt.Printf("testCallersFrames(%d):\n got %v\n want %v\n", i, frames, expected)
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}
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}
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}
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