4effda09d8
This is found during address sanitizer enablement on AIX.
On platforms that has no malloc/free calls before user's malloc/free
calls, `__sanitizer_get_current_allocated_bytes()` should return 0.
Otherwise the case like
`compiler-rt/test/sanitizer_common/TestCases/allocator_interface.cpp`
will fail at below scenario:
```
void Test(int size) {
auto allocated_bytes_before = __sanitizer_get_current_allocated_bytes();
int *p = (int *)malloc(size);
assert(__sanitizer_get_current_allocated_bytes() >=
size + allocated_bytes_before); // if allocated_bytes_before is 1, this assert will fail. allocated_bytes_before should be 0
}
```
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
// RUN: %clangxx_asan -O0 %s -pthread -o %t && %run %t
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// RUN: %clangxx_asan -O2 %s -pthread -o %t && %run %t
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// REQUIRES: stable-runtime
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#include <assert.h>
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#include <pthread.h>
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#include <sanitizer/allocator_interface.h>
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#include <stdio.h>
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#include <stdlib.h>
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const size_t kLargeAlloc = 1UL << 20;
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void* allocate(void *arg) {
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volatile void *ptr = malloc(kLargeAlloc);
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free((void*)ptr);
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return 0;
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}
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void* check_stats(void *arg) {
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assert(__sanitizer_get_current_allocated_bytes() >= 0);
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return 0;
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}
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int main() {
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size_t used_mem = __sanitizer_get_current_allocated_bytes();
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printf("Before: %zu\n", used_mem);
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const int kNumIterations = 1000;
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for (int iter = 0; iter < kNumIterations; iter++) {
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pthread_t thr[4];
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for (int j = 0; j < 4; j++) {
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assert(0 ==
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pthread_create(&thr[j], 0, (j < 2) ? allocate : check_stats, 0));
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}
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for (int j = 0; j < 4; j++)
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assert(0 == pthread_join(thr[j], 0));
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used_mem = __sanitizer_get_current_allocated_bytes();
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if (used_mem > kLargeAlloc) {
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printf("After iteration %d: %zu\n", iter, used_mem);
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return 1;
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}
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}
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printf("Success after %d iterations\n", kNumIterations);
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return 0;
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}
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