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