1// RUN: %clangxx_msan -O0 -g %s -o %t && %run %t
2// RUN: %clangxx_msan -O0 -g -DPOSITIVE %s -o %t && not %run %t |& FileCheck %s
3
4#include <obstack.h>
5#include <sanitizer/msan_interface.h>
6#include <stdlib.h>
7
8static void *obstack_chunk_alloc(size_t sz) {
9  return malloc(sz);
10}
11
12static void obstack_chunk_free(void *p) {
13  free(p);
14}
15
16int main(void) {
17  obstack obs;
18  obstack_init(&obs);
19  for (size_t sz = 16; sz < 0xFFFF; sz *= 2) {
20    void *p = obstack_alloc(&obs, sz);
21    int data[10] = {0};
22    obstack_grow(&obs, &data, sizeof(data));
23    obstack_blank(&obs, sz);
24    obstack_grow(&obs, &data, sizeof(data));
25    obstack_int_grow(&obs, 13);
26    p = obstack_finish(&obs);
27#ifdef POSITIVE
28    if (sz == 4096) {
29      __msan_check_mem_is_initialized(p, sizeof(data));
30      __msan_check_mem_is_initialized(p, sizeof(data) + 1);
31    }
32    // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
33    // CHECK: #0 0x{{.*}} in main{{.*}}obstack.cc:[[@LINE-30]]
34#endif
35  }
36  obstack_free(&obs, 0);
37}
38