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. 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 } 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 31 void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n"); } 32 void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n"); } 33 void FreeHook1(const volatile void *ptr) { WRITE("FH1\n"); } 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. 38 __attribute__((noinline)) void allocate(int *unused1, int *unused2) { 39 x = new int; 40 } 41 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
