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// run -gcflags -l=4
// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"runtime"
)
type frame struct {
pc uintptr
file string
line int
ok bool
}
var (
skip int
globalFrame frame
)
func f() {
g() // line 27
}
func g() {
h() // line 31
}
func h() {
x := &globalFrame
x.pc, x.file, x.line, x.ok = runtime.Caller(skip) // line 36
}
//go:noinline
func testCaller(skp int) frame {
skip = skp
f() // line 42
frame := globalFrame
if !frame.ok {
panic(fmt.Sprintf("skip=%d runtime.Caller failed", skp))
}
return frame
}
type wantFrame struct {
funcName string
line int
}
// -1 means don't care
var expected = []wantFrame{
0: {"main.h", 36},
1: {"main.g", 31},
2: {"main.f", 27},
3: {"main.testCaller", 42},
4: {"main.main", 68},
5: {"runtime.main", -1},
6: {"runtime.goexit", -1},
}
func main() {
for i := 0; i <= 6; i++ {
frame := testCaller(i) // line 68
fn := runtime.FuncForPC(frame.pc)
if expected[i].line >= 0 && frame.line != expected[i].line {
panic(fmt.Sprintf("skip=%d expected line %d, got line %d", i, expected[i].line, frame.line))
}
if fn.Name() != expected[i].funcName {
panic(fmt.Sprintf("skip=%d expected function %s, got %s", i, expected[i].funcName, fn.Name()))
}
}
}