mirror of
https://github.com/golang/go
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58 lines
904 B
Go
58 lines
904 B
Go
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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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package main
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// Using reflect to set a value was not seen by msan.
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/*
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#include <stdlib.h>
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extern void Go1(int*);
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extern void Go2(char*);
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// Use weak as a hack to permit defining a function even though we use export.
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void C1() __attribute__ ((weak));
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void C2() __attribute__ ((weak));
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void C1() {
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int i;
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Go1(&i);
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if (i != 42) {
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abort();
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}
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}
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void C2() {
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char a[2];
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a[1] = 42;
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Go2(a);
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if (a[0] != 42) {
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abort();
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}
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}
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*/
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import "C"
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import (
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"reflect"
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"unsafe"
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)
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//export Go1
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func Go1(p *C.int) {
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reflect.ValueOf(p).Elem().Set(reflect.ValueOf(C.int(42)))
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}
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//export Go2
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func Go2(p *C.char) {
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a := (*[2]byte)(unsafe.Pointer(p))
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reflect.Copy(reflect.ValueOf(a[:1]), reflect.ValueOf(a[1:]))
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}
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func main() {
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C.C1()
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C.C2()
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}
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