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      1 // Copyright 2016 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package main
      6 
      7 // Using reflect to set a value was not seen by msan.
      8 
      9 /*
     10 #include <stdlib.h>
     11 
     12 extern void Go1(int*);
     13 extern void Go2(char*);
     14 
     15 // Use weak as a hack to permit defining a function even though we use export.
     16 void C1() __attribute__ ((weak));
     17 void C2() __attribute__ ((weak));
     18 
     19 void C1() {
     20 	int i;
     21 	Go1(&i);
     22 	if (i != 42) {
     23 		abort();
     24 	}
     25 }
     26 
     27 void C2() {
     28 	char a[2];
     29 	a[1] = 42;
     30 	Go2(a);
     31 	if (a[0] != 42) {
     32 		abort();
     33 	}
     34 }
     35 */
     36 import "C"
     37 
     38 import (
     39 	"reflect"
     40 	"unsafe"
     41 )
     42 
     43 //export Go1
     44 func Go1(p *C.int) {
     45 	reflect.ValueOf(p).Elem().Set(reflect.ValueOf(C.int(42)))
     46 }
     47 
     48 //export Go2
     49 func Go2(p *C.char) {
     50 	a := (*[2]byte)(unsafe.Pointer(p))
     51 	reflect.Copy(reflect.ValueOf(a[:1]), reflect.ValueOf(a[1:]))
     52 }
     53 
     54 func main() {
     55 	C.C1()
     56 	C.C2()
     57 }
     58