1 // RUN: %clangxx -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
2
3 // Malloc/free hooks are not supported on Windows.
4 // XFAIL: win32
5
6 #include <stdlib.h>
7 #include <unistd.h>
8 #include <sanitizer/allocator_interface.h>
9
10 extern "C" {
11 const volatile void *global_ptr;
12
13 #define WRITE(s) write(1, s, sizeof(s))
14
15 // Note: avoid calling functions that allocate memory in malloc/free
16 // to avoid infinite recursion.
__sanitizer_malloc_hook(const volatile void * ptr,size_t sz)17 void __sanitizer_malloc_hook(const volatile void *ptr, size_t sz) {
18 if (__sanitizer_get_ownership(ptr) && sz == 4) {
19 WRITE("MallocHook\n");
20 global_ptr = ptr;
21 }
22 }
__sanitizer_free_hook(const volatile void * ptr)23 void __sanitizer_free_hook(const volatile void *ptr) {
24 if (__sanitizer_get_ownership(ptr) && ptr == global_ptr)
25 WRITE("FreeHook\n");
26 }
27 } // extern "C"
28
29 volatile int *x;
30
MallocHook1(const volatile void * ptr,size_t sz)31 void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); }
MallocHook2(const volatile void * ptr,size_t sz)32 void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); }
FreeHook1(const volatile void * ptr)33 void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); }
FreeHook2(const volatile void * ptr)34 void FreeHook2(const volatile void *ptr) { WRITE("FH2\n"); }
35 // Call this function with uninitialized arguments to poison
36 // TLS shadow for function parameters before calling operator
37 // new and, eventually, user-provided hook.
allocate(int * unused1,int * unused2)38 __attribute__((noinline)) void allocate(int *unused1, int *unused2) {
39 x = new int;
40 }
41
main()42 int main() {
43 __sanitizer_install_malloc_and_free_hooks(MallocHook1, FreeHook1);
44 __sanitizer_install_malloc_and_free_hooks(MallocHook2, FreeHook2);
45 int *undef1, *undef2;
46 allocate(undef1, undef2);
47 // CHECK: MallocHook
48 // CHECK: MH1
49 // CHECK: MH2
50 // Check that malloc hook was called with correct argument.
51 if (global_ptr != (void*)x) {
52 _exit(1);
53 }
54 *x = 0;
55 delete x;
56 // CHECK: FreeHook
57 // CHECK: FH1
58 // CHECK: FH2
59 return 0;
60 }
61