go issue7690 源码
golang issue7690 代码
文件路径：/test/fixedbugs/issue7690.go
// run
// Copyright 2014 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.
// issue 7690 - Stack and other routines did not back up initial PC
// into CALL instruction, instead reporting line number of next instruction,
// which might be on a different line.
package main
import (
"bytes"
"regexp"
"runtime"
"strconv"
)
func main() {
buf1 := make([]byte, 1000)
buf2 := make([]byte, 1000)
runtime.Stack(buf1, false) // CALL is last instruction on this line
n := runtime.Stack(buf2, false) // CALL is followed by load of result from stack
buf1 = buf1[:bytes.IndexByte(buf1, 0)]
buf2 = buf2[:n]
re := regexp.MustCompile(`(?m)^main\.main\(\)\n.*/issue7690.go:([0-9]+)`)
m1 := re.FindStringSubmatch(string(buf1))
if m1 == nil {
println("BUG: cannot find main.main in first trace")
return
}
m2 := re.FindStringSubmatch(string(buf2))
if m2 == nil {
println("BUG: cannot find main.main in second trace")
return
}
n1, _ := strconv.Atoi(m1[1])
n2, _ := strconv.Atoi(m2[1])
if n1+1 != n2 {
println("BUG: expect runtime.Stack on back to back lines, have", n1, n2)
println(string(buf1))
println(string(buf2))
}
}
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