1// RUN: %clangxx -m64 -O0 -g -xc++ %s -o %t && %run %t
2// RUN: %clangxx -m64 -O3 -g -xc++ %s -o %t && %run %t
3// REQUIRES: x86_64-supported-target
4
5#include <assert.h>
6#include <stdio.h>
7#include <stdlib.h>
8#include <string.h>
9
10#ifndef __has_feature
11#define __has_feature(x) 0
12#endif
13
14#if __has_feature(memory_sanitizer)
15#include <sanitizer/msan_interface.h>
16static void check_mem_is_good(void *p, size_t s) {
17  __msan_check_mem_is_initialized(p, s);
18}
19#elif __has_feature(address_sanitizer)
20#include <sanitizer/asan_interface.h>
21static void check_mem_is_good(void *p, size_t s) {
22  assert(__asan_region_is_poisoned(p, s) == 0);
23}
24#else
25static void check_mem_is_good(void *p, size_t s) {}
26#endif
27
28static void run(bool flush) {
29  char *buf;
30  size_t buf_len;
31  fprintf(stderr, " &buf %p, &buf_len %p\n", &buf, &buf_len);
32  FILE *fp = open_memstream(&buf, &buf_len);
33  fprintf(fp, "hello");
34  if (flush) {
35    fflush(fp);
36    check_mem_is_good(&buf, sizeof(buf));
37    check_mem_is_good(&buf_len, sizeof(buf_len));
38    check_mem_is_good(buf, buf_len);
39  }
40
41  char *p = new char[1024];
42  memset(p, 'a', 1023);
43  p[1023] = 0;
44  for (int i = 0; i < 100; ++i)
45    fprintf(fp, "%s", p);
46  delete[] p;
47
48  if (flush) {
49    fflush(fp);
50    fprintf(stderr, " %p addr %p, len %zu\n", &buf, buf, buf_len);
51    check_mem_is_good(&buf, sizeof(buf));
52    check_mem_is_good(&buf_len, sizeof(buf_len));
53    check_mem_is_good(buf, buf_len);\
54  }
55
56  fclose(fp);
57  check_mem_is_good(&buf, sizeof(buf));
58  check_mem_is_good(&buf_len, sizeof(buf_len));
59  check_mem_is_good(buf, buf_len);
60
61  free(buf);
62}
63
64int main(void) {
65  for (int i = 0; i < 100; ++i)
66    run(false);
67  for (int i = 0; i < 100; ++i)
68    run(true);
69  return 0;
70}
71