1// RUN: %clangxx_asan -O2 %s -o %t
2// RUN: %env_asan_opts=fast_unwind_on_malloc=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST
3// RUN: %env_asan_opts=fast_unwind_on_malloc=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SLOW
4
5// Test how well we unwind in presence of qsort in the stack
6// (i.e. if we can unwind through a function compiled w/o frame pointers).
7// https://code.google.com/p/address-sanitizer/issues/detail?id=137
8
9// Fast unwinder is only available on x86_64 and i386.
10// REQUIRES: x86-target-arch
11
12// REQUIRES: compiler-rt-optimized
13
14#include <stdlib.h>
15#include <stdio.h>
16
17int *GlobalPtr;
18
19extern "C" {
20int QsortCallback(const void *a, const void *b) {
21  char *x = (char*)a;
22  char *y = (char*)b;
23  printf("Calling QsortCallback\n");
24  GlobalPtr = new int[10];
25  return (int)*x - (int)*y;
26}
27
28__attribute__((noinline))
29void MyQsort(char *a, size_t size) {
30  printf("Calling qsort\n");
31  qsort(a, size, sizeof(char), QsortCallback);
32  printf("Done\n");  // Avoid tail call.
33}
34}  // extern "C"
35
36int main() {
37  char a[2] = {1, 2};
38  MyQsort(a, 2);
39  return GlobalPtr[10];
40}
41
42// Fast unwind may not unwind through qsort.
43// CHECK-FAST: ERROR: AddressSanitizer: heap-buffer-overflow
44// CHECK-FAST: is located 0 bytes to the right
45// CHECK-FAST: #0{{.*}}operator new
46// CHECK-FAST-NEXT: #1{{.*}}QsortCallback
47
48// CHECK-SLOW: ERROR: AddressSanitizer: heap-buffer-overflow
49// CHECK-SLOW: is located 0 bytes to the right
50// CHECK-SLOW: #0{{.*}}operator new
51// CHECK-SLOW-NEXT: #1{{.*}}QsortCallback
52// CHECK-SLOW: #{{.*}}MyQsort
53// CHECK-SLOW-NEXT: #{{.*}}main
54