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master
test/fixedbugs/issue17381.go
54 строки
1 KB
Cherry Zhang
cmd/internal/obj: save link register in leaf function with non-empty frame on PPC64, ARM64, S390X
26 окт 2016, 00:44
26 окт 2016, 00:44
698bfa1
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// run // Copyright 2016 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 17381: make sure leave function with non-empty frame // saves link register, so that traceback will work. package main import ( "runtime" "unsafe" ) func main() { defer func() { if recover() == nil { panic("did not panic") } pcs := make([]uintptr, 20) n := runtime.Callers(1, pcs) for _, pc := range pcs[:n] { if runtime.FuncForPC(pc).Name() == "main.main" { return } } panic("cannot find main.main in backtrace") }() prep() f() // should panic } func funcPC(f interface{}) uintptr { var ptr uintptr return **(**uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&f)) + unsafe.Sizeof(ptr))) } //go:noinline func f() { var t [1]int // non-empty frame *(*int)(nil) = t[0] } var p = funcPC(runtime.GC) + 8 //go:noinline func prep() { // put some garbage on stack var x = [20]uintptr{p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p} _ = x }