mirror of
https://github.com/golang/go
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55 lines
1.0 KiB
Go
55 lines
1.0 KiB
Go
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// run
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// Copyright 2016 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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// issue 17381: make sure leave function with non-empty frame
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// saves link register, so that traceback will work.
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package main
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import (
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"runtime"
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"unsafe"
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)
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func main() {
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defer func() {
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if recover() == nil {
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panic("did not panic")
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}
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pcs := make([]uintptr, 20)
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n := runtime.Callers(1, pcs)
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for _, pc := range pcs[:n] {
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if runtime.FuncForPC(pc).Name() == "main.main" {
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return
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}
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}
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panic("cannot find main.main in backtrace")
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}()
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prep()
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f() // should panic
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}
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func funcPC(f interface{}) uintptr {
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var ptr uintptr
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return **(**uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&f)) + unsafe.Sizeof(ptr)))
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}
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//go:noinline
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func f() {
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var t [1]int // non-empty frame
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*(*int)(nil) = t[0]
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}
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var p = funcPC(runtime.GC) + 8
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//go:noinline
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func prep() {
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// put some garbage on stack
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var x = [20]uintptr{p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p}
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_ = x
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}
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