mirror of
https://github.com/golang/go
synced 2024-11-18 04:24:47 -07:00
d841860f43
When using gccgo it's OK if a pointer passed to C remains on the stack. Gccgo does not have the clear distinction between C and Go stacks. Change-Id: I3af9dd6fe078214ab16d9d8dad2d206608d7891d Reviewed-on: https://go-review.googlesource.com/16774 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Minux Ma <minux@golang.org>
77 lines
1.5 KiB
Go
77 lines
1.5 KiB
Go
// Copyright 2015 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 10303. Pointers passed to C were not marked as escaping (bug in cgo).
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package cgotest
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import "runtime"
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/*
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typedef int *intptr;
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void setintstar(int *x) {
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*x = 1;
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}
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void setintptr(intptr x) {
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*x = 1;
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}
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void setvoidptr(void *x) {
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*(int*)x = 1;
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}
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typedef struct Struct Struct;
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struct Struct {
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int *P;
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};
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void setstruct(Struct s) {
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*s.P = 1;
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}
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*/
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import "C"
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import (
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"testing"
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"unsafe"
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)
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func test10303(t *testing.T, n int) {
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if runtime.Compiler == "gccgo" {
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t.Skip("gccgo permits C pointers on the stack")
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}
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// Run at a few different stack depths just to avoid an unlucky pass
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// due to variables ending up on different pages.
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if n > 0 {
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test10303(t, n-1)
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}
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if t.Failed() {
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return
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}
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var x, y, z, v, si C.int
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var s C.Struct
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C.setintstar(&x)
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C.setintptr(&y)
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C.setvoidptr(unsafe.Pointer(&v))
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s.P = &si
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C.setstruct(s)
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if uintptr(unsafe.Pointer(&x))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
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t.Error("C int* argument on stack")
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}
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if uintptr(unsafe.Pointer(&y))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
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t.Error("C intptr argument on stack")
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}
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if uintptr(unsafe.Pointer(&v))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
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t.Error("C void* argument on stack")
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}
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if uintptr(unsafe.Pointer(&si))&^0xfff == uintptr(unsafe.Pointer(&z))&^0xfff {
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t.Error("C struct field pointer on stack")
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}
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}
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