libgo/misc/cgo/testsanitizers/src/msan2_cmsan.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 #cgo LDFLAGS: -fsanitize=memory
   9 #cgo CPPFLAGS: -fsanitize=memory
  10
  11 #include <string.h>
  12 #include <stdint.h>
  13 #include <stdlib.h>
  14
  15 void f(int32_t *p, int n) {
  16   int32_t * volatile q = (int32_t *)malloc(sizeof(int32_t) * n);
  17   memcpy(p, q, n * sizeof(*p));
  18   free(q);
  19 }
  20
  21 void g(int32_t *p, int n) {
  22   if (p[4] != 1) {
  23     abort();
  24   }
  25 }
  26 */
  27 import "C"
  28
  29 import (
  30         "unsafe"
  31 )
  32
  33 func main() {
  34         a := make([]int32, 10)
  35         C.f((*C.int32_t)(unsafe.Pointer(&a[0])), C.int(len(a)))
  36         a[4] = 1
  37         C.g((*C.int32_t)(unsafe.Pointer(&a[0])), C.int(len(a)))
  38 }