1 //===-- asan_interceptors.cc ----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is a part of AddressSanitizer, an address sanity checker.
12 // Interceptors for operators new and delete.
13 //===----------------------------------------------------------------------===//
15 #include "asan_allocator.h"
16 #include "asan_internal.h"
17 #include "asan_stack.h"
19 #include "sanitizer_common/sanitizer_interception.h"
24 // This function is a no-op. We need it to make sure that object file
25 // with our replacements will actually be loaded from static ASan
26 // run-time library at link-time.
27 void ReplaceOperatorsNewAndDelete() { }
30 using namespace __asan
; // NOLINT
32 // This code has issues on OSX.
33 // See https://code.google.com/p/address-sanitizer/issues/detail?id=131.
35 // Fake std::nothrow_t to avoid including <new>.
40 #define OPERATOR_NEW_BODY(type) \
41 GET_STACK_TRACE_MALLOC;\
42 return asan_memalign(0, size, &stack, type);
44 // On OS X it's not enough to just provide our own 'operator new' and
45 // 'operator delete' implementations, because they're going to be in the
46 // runtime dylib, and the main executable will depend on both the runtime
47 // dylib and libstdc++, each of those'll have its implementation of new and
49 // To make sure that C++ allocation/deallocation operators are overridden on
50 // OS X we need to intercept them using their mangled names.
52 // FreeBSD prior v9.2 have wrong definition of 'size_t'.
53 // http://svnweb.freebsd.org/base?view=revision&revision=232261
54 #if SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
55 #include <sys/param.h>
56 #if __FreeBSD_version <= 902001 // v9.2
57 #define size_t unsigned
58 #endif // __FreeBSD_version
59 #endif // SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 32
62 void *operator new(size_t size
) { OPERATOR_NEW_BODY(FROM_NEW
); }
64 void *operator new[](size_t size
) { OPERATOR_NEW_BODY(FROM_NEW_BR
); }
66 void *operator new(size_t size
, std::nothrow_t
const&)
67 { OPERATOR_NEW_BODY(FROM_NEW
); }
69 void *operator new[](size_t size
, std::nothrow_t
const&)
70 { OPERATOR_NEW_BODY(FROM_NEW_BR
); }
72 #else // SANITIZER_MAC
73 INTERCEPTOR(void *, _Znwm
, size_t size
) {
74 OPERATOR_NEW_BODY(FROM_NEW
);
76 INTERCEPTOR(void *, _Znam
, size_t size
) {
77 OPERATOR_NEW_BODY(FROM_NEW_BR
);
79 INTERCEPTOR(void *, _ZnwmRKSt9nothrow_t
, size_t size
, std::nothrow_t
const&) {
80 OPERATOR_NEW_BODY(FROM_NEW
);
82 INTERCEPTOR(void *, _ZnamRKSt9nothrow_t
, size_t size
, std::nothrow_t
const&) {
83 OPERATOR_NEW_BODY(FROM_NEW_BR
);
87 #define OPERATOR_DELETE_BODY(type) \
88 GET_STACK_TRACE_FREE;\
89 asan_free(ptr, &stack, type);
93 void operator delete(void *ptr
) throw() {
94 OPERATOR_DELETE_BODY(FROM_NEW
);
97 void operator delete[](void *ptr
) throw() {
98 OPERATOR_DELETE_BODY(FROM_NEW_BR
);
100 INTERCEPTOR_ATTRIBUTE
101 void operator delete(void *ptr
, std::nothrow_t
const&) {
102 OPERATOR_DELETE_BODY(FROM_NEW
);
104 INTERCEPTOR_ATTRIBUTE
105 void operator delete[](void *ptr
, std::nothrow_t
const&) {
106 OPERATOR_DELETE_BODY(FROM_NEW_BR
);
109 #else // SANITIZER_MAC
110 INTERCEPTOR(void, _ZdlPv
, void *ptr
) {
111 OPERATOR_DELETE_BODY(FROM_NEW
);
113 INTERCEPTOR(void, _ZdaPv
, void *ptr
) {
114 OPERATOR_DELETE_BODY(FROM_NEW_BR
);
116 INTERCEPTOR(void, _ZdlPvRKSt9nothrow_t
, void *ptr
, std::nothrow_t
const&) {
117 OPERATOR_DELETE_BODY(FROM_NEW
);
119 INTERCEPTOR(void, _ZdaPvRKSt9nothrow_t
, void *ptr
, std::nothrow_t
const&) {
120 OPERATOR_DELETE_BODY(FROM_NEW_BR
);