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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>
78 lines
1.4 KiB
Go
78 lines
1.4 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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type frame struct {
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pc uintptr
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file string
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line int
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ok bool
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}
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var (
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skip int
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globalFrame frame
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)
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func f() {
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g() // line 27
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}
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func g() {
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h() // line 31
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}
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func h() {
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x := &globalFrame
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x.pc, x.file, x.line, x.ok = runtime.Caller(skip) // line 36
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}
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//go:noinline
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func testCaller(skp int) frame {
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skip = skp
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f() // line 42
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frame := globalFrame
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if !frame.ok {
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panic(fmt.Sprintf("skip=%d runtime.Caller failed", skp))
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}
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return frame
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}
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type wantFrame struct {
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funcName string
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line int
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}
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// -1 means don't care
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var expected = []wantFrame{
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0: {"main.h", 36},
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1: {"main.g", 31},
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2: {"main.f", 27},
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3: {"main.testCaller", 42},
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4: {"main.main", 68},
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5: {"runtime.main", -1},
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6: {"runtime.goexit", -1},
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}
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func main() {
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for i := 0; i <= 6; i++ {
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frame := testCaller(i) // line 68
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fn := runtime.FuncForPC(frame.pc)
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if expected[i].line >= 0 && frame.line != expected[i].line {
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panic(fmt.Sprintf("skip=%d expected line %d, got line %d", i, expected[i].line, frame.line))
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}
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if fn.Name() != expected[i].funcName {
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panic(fmt.Sprintf("skip=%d expected function %s, got %s", i, expected[i].funcName, fn.Name()))
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}
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}
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}
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