libgo/misc/cgo/testsanitizers/src/msan2.go

   1 // Copyright 2015 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 /*
   8 #include <string.h>
   9 #include <stdint.h>
  10 #include <stdlib.h>
  11
  12 void f(int32_t *p, int n) {
  13   int32_t * volatile q = (int32_t *)malloc(sizeof(int32_t) * n);
  14   memcpy(p, q, n * sizeof(*p));
  15   free(q);
  16 }
  17
  18 void g(int32_t *p, int n) {
  19   if (p[4] != 1) {
  20     abort();
  21   }
  22 }
  23 */
  24 import "C"
  25
  26 import (
  27         "unsafe"
  28 )
  29
  30 func main() {
  31         a := make([]int32, 10)
  32         C.f((*C.int32_t)(unsafe.Pointer(&a[0])), C.int(len(a)))
  33         a[4] = 1
  34         C.g((*C.int32_t)(unsafe.Pointer(&a[0])), C.int(len(a)))
  35 }