lib/asan/asan_interceptors.cc - platform/external/compiler-rt - Gitiles

 //===-- asan_interceptors.cc ------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file is a part of AddressSanitizer, an address sanity checker.
 //
 // Intercept various libc functions.
 //===----------------------------------------------------------------------===//
 #include "asan_interceptors.h"

 #include "asan_allocator.h"
 #include "asan_interface.h"
 #include "asan_internal.h"
 #include "asan_mac.h"
 #include "asan_mapping.h"
 #include "asan_stack.h"
 #include "asan_stats.h"
 #include "asan_thread_registry.h"
 #include "interception/interception.h"

 #include <new>

 #if defined(__APPLE__)
 // FIXME(samsonov): Gradually replace system headers with declarations of
 // intercepted functions.
 #include <pthread.h>
 #include <signal.h>
 #include <string.h>
 #include <strings.h>
 #endif  // __APPLE__

 namespace __asan {

 // Instruments read/write access to a single byte in memory.
 // On error calls __asan_report_error, which aborts the program.
 static NOINLINE void AccessAddress(uintptr_t address, bool isWrite) {
   if (__asan_address_is_poisoned((void*)address)) {
     GET_BP_PC_SP;
     __asan_report_error(pc, bp, sp, address, isWrite, /* access_size */ 1);
   }
 }

 // We implement ACCESS_MEMORY_RANGE, ASAN_READ_RANGE,
 // and ASAN_WRITE_RANGE as macro instead of function so
 // that no extra frames are created, and stack trace contains
 // relevant information only.

 // Instruments read/write access to a memory range.
 // More complex implementation is possible, for now just
 // checking the first and the last byte of a range.
 #define ACCESS_MEMORY_RANGE(offset, size, isWrite) do { \
   if (size > 0) { \
     uintptr_t ptr = (uintptr_t)(offset); \
     AccessAddress(ptr, isWrite); \
     AccessAddress(ptr + (size) - 1, isWrite); \
   } \
 } while (0)

 #define ASAN_READ_RANGE(offset, size) do { \
   ACCESS_MEMORY_RANGE(offset, size, false); \
 } while (0)

 #define ASAN_WRITE_RANGE(offset, size) do { \
   ACCESS_MEMORY_RANGE(offset, size, true); \
 } while (0)

 // Behavior of functions like "memcpy" or "strcpy" is undefined
 // if memory intervals overlap. We report error in this case.
 // Macro is used to avoid creation of new frames.
 static inline bool RangesOverlap(const char *offset1, size_t length1,
                                  const char *offset2, size_t length2) {
   return !((offset1 + length1 <= offset2) || (offset2 + length2 <= offset1));
 }
 #define CHECK_RANGES_OVERLAP(name, _offset1, length1, _offset2, length2) do { \
   const char *offset1 = (const char*)_offset1; \
   const char *offset2 = (const char*)_offset2; \
   if (RangesOverlap(offset1, length1, offset2, length2)) { \
     Report("ERROR: AddressSanitizer %s-param-overlap: " \
            "memory ranges [%p,%p) and [%p, %p) overlap\n", \
            name, offset1, offset1 + length1, offset2, offset2 + length2); \
     PRINT_CURRENT_STACK(); \
     ShowStatsAndAbort(); \
   } \
 } while (0)

 #define ENSURE_ASAN_INITED() do { \
   CHECK(!asan_init_is_running); \
   if (!asan_inited) { \
     __asan_init(); \
   } \
 } while (0)

 static inline bool IsSpace(int c) {
   return (c == ' ') || (c == '\n') || (c == '\t') ||
          (c == '\f') || (c == '\r') || (c == '\v');
 }

 static inline bool IsDigit(int c) {
   return (c >= '0') && (c <= '9');
 }

 static inline int ToLower(int c) {
   return (c >= 'A' && c <= 'Z') ? (c + 'a' - 'A') : c;
 }

 // ---------------------- Internal string functions ---------------- {{{1

 int64_t internal_simple_strtoll(const char *nptr, char **endptr, int base) {
   CHECK(base == 10);
   while (IsSpace(*nptr)) nptr++;
   int sgn = 1;
   uint64_t res = 0;
   bool have_digits = false;
   char *old_nptr = (char*)nptr;
   if (*nptr == '+') {
     sgn = 1;
     nptr++;
   } else if (*nptr == '-') {
     sgn = -1;
     nptr++;
   }
   while (IsDigit(*nptr)) {
     res = (res <= UINT64_MAX / 10) ? res * 10 : UINT64_MAX;
     int digit = ((*nptr) - '0');
     res = (res <= UINT64_MAX - digit) ? res + digit : UINT64_MAX;
     have_digits = true;
     nptr++;
   }
   if (endptr != NULL) {
     *endptr = (have_digits) ? (char*)nptr : old_nptr;
   }
   if (sgn > 0) {
     return (int64_t)(Min((uint64_t)INT64_MAX, res));
   } else {
     return (res > INT64_MAX) ? INT64_MIN : ((int64_t)res * -1);
   }
 }

 int64_t internal_atoll(const char *nptr) {
   return internal_simple_strtoll(nptr, (char**)NULL, 10);
 }

 size_t internal_strlen(const char *s) {
   size_t i = 0;
   while (s[i]) i++;
   return i;
 }

 size_t internal_strnlen(const char *s, size_t maxlen) {
 #ifndef __APPLE__
   if (REAL(strnlen) != NULL) {
     return REAL(strnlen)(s, maxlen);
   }
 #endif
   size_t i = 0;
   while (i < maxlen && s[i]) i++;
   return i;
 }

 char* internal_strchr(const char *s, int c) {
   while (true) {
     if (*s == (char)c)
       return (char*)s;
     if (*s == 0)
       return NULL;
     s++;
   }
 }

 void* internal_memchr(const void* s, int c, size_t n) {
   const char* t = (char*)s;
   for (size_t i = 0; i < n; ++i, ++t)
     if (*t == c)
       return (void*)t;
   return NULL;
 }

 int internal_memcmp(const void* s1, const void* s2, size_t n) {
   const char* t1 = (char*)s1;
   const char* t2 = (char*)s2;
   for (size_t i = 0; i < n; ++i, ++t1, ++t2)
     if (*t1 != *t2)
       return *t1 < *t2 ? -1 : 1;
   return 0;
 }

 char *internal_strstr(const char *haystack, const char *needle) {
   // This is O(N^2), but we are not using it in hot places.
   size_t len1 = internal_strlen(haystack);
   size_t len2 = internal_strlen(needle);
   if (len1 < len2) return 0;
   for (size_t pos = 0; pos <= len1 - len2; pos++) {
     if (internal_memcmp(haystack + pos, needle, len2) == 0)
       return (char*)haystack + pos;
   }
   return 0;
 }

 char *internal_strncat(char *dst, const char *src, size_t n) {
   size_t len = internal_strlen(dst);
   size_t i;
   for (i = 0; i < n && src[i]; i++)
     dst[len + i] = src[i];
   dst[len + i] = 0;
   return dst;
 }

 int internal_strcmp(const char *s1, const char *s2) {
   while (true) {
     unsigned c1 = *s1;
     unsigned c2 = *s2;
     if (c1 != c2) return (c1 < c2) ? -1 : 1;
     if (c1 == 0) break;
     s1++;
     s2++;
   }
   return 0;
 }

 }  // namespace __asan

 // ---------------------- Wrappers ---------------- {{{1
 using namespace __asan;  // NOLINT

 #define OPERATOR_NEW_BODY \
   GET_STACK_TRACE_HERE_FOR_MALLOC;\
   return asan_memalign(0, size, &stack);

 #ifdef ANDROID
 void *operator new(size_t size) { OPERATOR_NEW_BODY; }
 void *operator new[](size_t size) { OPERATOR_NEW_BODY; }
 #else
 void *operator new(size_t size) throw(std::bad_alloc) { OPERATOR_NEW_BODY; }
 void *operator new[](size_t size) throw(std::bad_alloc) { OPERATOR_NEW_BODY; }
 void *operator new(size_t size, std::nothrow_t const&) throw()
 { OPERATOR_NEW_BODY; }
 void *operator new[](size_t size, std::nothrow_t const&) throw()
 { OPERATOR_NEW_BODY; }
 #endif

 #define OPERATOR_DELETE_BODY \
   GET_STACK_TRACE_HERE_FOR_FREE(ptr);\
   asan_free(ptr, &stack);

 void operator delete(void *ptr) throw() { OPERATOR_DELETE_BODY; }
 void operator delete[](void *ptr) throw() { OPERATOR_DELETE_BODY; }
 void operator delete(void *ptr, std::nothrow_t const&) throw()
 { OPERATOR_DELETE_BODY; }
 void operator delete[](void *ptr, std::nothrow_t const&) throw()
 { OPERATOR_DELETE_BODY;}

 static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
   AsanThread *t = (AsanThread*)arg;
   asanThreadRegistry().SetCurrent(t);
   return t->ThreadStart();
 }

 #ifndef _WIN32
 INTERCEPTOR(int, pthread_create, void *thread,
     void *attr, void *(*start_routine)(void*), void *arg) {
   GET_STACK_TRACE_HERE(kStackTraceMax);
   int current_tid = asanThreadRegistry().GetCurrentTidOrMinusOne();
   AsanThread *t = AsanThread::Create(current_tid, start_routine, arg, &stack);
   asanThreadRegistry().RegisterThread(t);
   return REAL(pthread_create)(thread, attr, asan_thread_start, t);
 }
 #endif  // !_WIN32

 #if !defined(ANDROID) && !defined(_WIN32)
 INTERCEPTOR(void*, signal, int signum, void *handler) {
   if (!AsanInterceptsSignal(signum)) {
     return REAL(signal)(signum, handler);
   }
   return NULL;
 }

 INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
                             struct sigaction *oldact) {
   if (!AsanInterceptsSignal(signum)) {
     return REAL(sigaction)(signum, act, oldact);
   }
   return 0;
 }
 #endif  // !ANDROID && !_WIN32

 INTERCEPTOR(void, longjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(longjmp)(env, val);
 }

 #if !defined(_WIN32)
 INTERCEPTOR(void, _longjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(_longjmp)(env, val);
 }

 INTERCEPTOR(void, siglongjmp, void *env, int val) {
   __asan_handle_no_return();
   REAL(siglongjmp)(env, val);
 }
 #endif

 #if ASAN_HAS_EXCEPTIONS == 1
 #ifdef __APPLE__
 extern "C" void __cxa_throw(void *a, void *b, void *c);
 #endif  // __APPLE__

 INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) {
   CHECK(REAL(__cxa_throw));
   __asan_handle_no_return();
   REAL(__cxa_throw)(a, b, c);
 }
 #endif

 // intercept mlock and friends.
 // Since asan maps 16T of RAM, mlock is completely unfriendly to asan.
 // All functions return 0 (success).
 static void MlockIsUnsupported() {
   static bool printed = 0;
   if (printed) return;
   printed = true;
   Printf("INFO: AddressSanitizer ignores mlock/mlockall/munlock/munlockall\n");
 }

 extern "C" {
 INTERCEPTOR_ATTRIBUTE
 int mlock(const void *addr, size_t len) {
   MlockIsUnsupported();
   return 0;
 }

 INTERCEPTOR_ATTRIBUTE
 int munlock(const void *addr, size_t len) {
   MlockIsUnsupported();
   return 0;
 }

 INTERCEPTOR_ATTRIBUTE
 int mlockall(int flags) {
   MlockIsUnsupported();
   return 0;
 }

 INTERCEPTOR_ATTRIBUTE
 int munlockall(void) {
   MlockIsUnsupported();
   return 0;
 }
 }  // extern "C"

 static inline int CharCmp(unsigned char c1, unsigned char c2) {
   return (c1 == c2) ? 0 : (c1 < c2) ? -1 : 1;
 }

 static inline int CharCaseCmp(unsigned char c1, unsigned char c2) {
   int c1_low = ToLower(c1);
   int c2_low = ToLower(c2);
   return c1_low - c2_low;
 }

 INTERCEPTOR(int, memcmp, const void *a1, const void *a2, size_t size) {
   ENSURE_ASAN_INITED();
   unsigned char c1 = 0, c2 = 0;
   const unsigned char *s1 = (const unsigned char*)a1;
   const unsigned char *s2 = (const unsigned char*)a2;
   size_t i;
   for (i = 0; i < size; i++) {
     c1 = s1[i];
     c2 = s2[i];
     if (c1 != c2) break;
   }
   ASAN_READ_RANGE(s1, Min(i + 1, size));
   ASAN_READ_RANGE(s2, Min(i + 1, size));
   return CharCmp(c1, c2);
 }

 INTERCEPTOR(void*, memcpy, void *to, const void *from, size_t size) {
   // memcpy is called during __asan_init() from the internals
   // of printf(...).
   if (asan_init_is_running) {
     return REAL(memcpy)(to, from, size);
   }
   ENSURE_ASAN_INITED();
   if (FLAG_replace_intrin) {
     if (to != from) {
       // We do not treat memcpy with to==from as a bug.
       // See http://llvm.org/bugs/show_bug.cgi?id=11763.
       CHECK_RANGES_OVERLAP("memcpy", to, size, from, size);
     }
     ASAN_WRITE_RANGE(from, size);
     ASAN_READ_RANGE(to, size);
   }
   return REAL(memcpy)(to, from, size);
 }

 INTERCEPTOR(void*, memmove, void *to, const void *from, size_t size) {
   ENSURE_ASAN_INITED();
   if (FLAG_replace_intrin) {
     ASAN_WRITE_RANGE(from, size);
     ASAN_READ_RANGE(to, size);
   }
   return REAL(memmove)(to, from, size);
 }

 INTERCEPTOR(void*, memset, void *block, int c, size_t size) {
   // memset is called inside INTERCEPT_FUNCTION on Mac.
   if (asan_init_is_running) {
     return REAL(memset)(block, c, size);
   }
   ENSURE_ASAN_INITED();
   if (FLAG_replace_intrin) {
     ASAN_WRITE_RANGE(block, size);
   }
   return REAL(memset)(block, c, size);
 }

 INTERCEPTOR(char*, strchr, const char *str, int c) {
   ENSURE_ASAN_INITED();
   char *result = REAL(strchr)(str, c);
   if (FLAG_replace_str) {
     size_t bytes_read = (result ? result - str : REAL(strlen)(str)) + 1;
     ASAN_READ_RANGE(str, bytes_read);
   }
   return result;
 }

 #ifdef __linux__
 INTERCEPTOR(char*, index, const char *string, int c)
   ALIAS(WRAPPER_NAME(strchr));
 #else
 DEFINE_REAL(char*, index, const char *string, int c);
 #endif

 #ifdef ANDROID
 DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act,
     struct sigaction *oldact);
 #endif

 INTERCEPTOR(int, strcasecmp, const char *s1, const char *s2) {
   ENSURE_ASAN_INITED();
   unsigned char c1, c2;
   size_t i;
   for (i = 0; ; i++) {
     c1 = (unsigned char)s1[i];
     c2 = (unsigned char)s2[i];
     if (CharCaseCmp(c1, c2) != 0 || c1 == '\0') break;
   }
   ASAN_READ_RANGE(s1, i + 1);
   ASAN_READ_RANGE(s2, i + 1);
   return CharCaseCmp(c1, c2);
 }

 INTERCEPTOR(char*, strcat, char *to, const char *from) {  // NOLINT
   ENSURE_ASAN_INITED();
   if (FLAG_replace_str) {
     size_t from_length = REAL(strlen)(from);
     ASAN_READ_RANGE(from, from_length + 1);
     if (from_length > 0) {
       size_t to_length = REAL(strlen)(to);
       ASAN_READ_RANGE(to, to_length);
       ASAN_WRITE_RANGE(to + to_length, from_length + 1);
       CHECK_RANGES_OVERLAP("strcat", to, to_length + 1, from, from_length + 1);
     }
   }
   return REAL(strcat)(to, from);  // NOLINT
 }

 INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
   if (!asan_inited) {
     return internal_strcmp(s1, s2);
   }
   unsigned char c1, c2;
   size_t i;
   for (i = 0; ; i++) {
     c1 = (unsigned char)s1[i];
     c2 = (unsigned char)s2[i];
     if (c1 != c2 || c1 == '\0') break;
   }
   ASAN_READ_RANGE(s1, i + 1);
   ASAN_READ_RANGE(s2, i + 1);
   return CharCmp(c1, c2);
 }

 INTERCEPTOR(char*, strcpy, char *to, const char *from) {  // NOLINT
   // strcpy is called from malloc_default_purgeable_zone()
   // in __asan::ReplaceSystemAlloc() on Mac.
   if (asan_init_is_running) {
     return REAL(strcpy)(to, from);  // NOLINT
   }
   ENSURE_ASAN_INITED();
   if (FLAG_replace_str) {
     size_t from_size = REAL(strlen)(from) + 1;
     CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size);
     ASAN_READ_RANGE(from, from_size);
     ASAN_WRITE_RANGE(to, from_size);
   }
   return REAL(strcpy)(to, from);  // NOLINT
 }

 INTERCEPTOR(char*, strdup, const char *s) {
   ENSURE_ASAN_INITED();
   if (FLAG_replace_str) {
     size_t length = REAL(strlen)(s);
     ASAN_READ_RANGE(s, length + 1);
   }
   return REAL(strdup)(s);
 }

 INTERCEPTOR(size_t, strlen, const char *s) {
   // strlen is called from malloc_default_purgeable_zone()
   // in __asan::ReplaceSystemAlloc() on Mac.
   if (asan_init_is_running) {
     return REAL(strlen)(s);
   }
   ENSURE_ASAN_INITED();
   size_t length = REAL(strlen)(s);
   if (FLAG_replace_str) {
     ASAN_READ_RANGE(s, length + 1);
   }
   return length;
 }

 INTERCEPTOR(int, strncasecmp, const char *s1, const char *s2, size_t n) {
   ENSURE_ASAN_INITED();
   unsigned char c1 = 0, c2 = 0;
   size_t i;
   for (i = 0; i < n; i++) {
     c1 = (unsigned char)s1[i];
     c2 = (unsigned char)s2[i];
     if (CharCaseCmp(c1, c2) != 0 || c1 == '\0') break;
   }
   ASAN_READ_RANGE(s1, Min(i + 1, n));
   ASAN_READ_RANGE(s2, Min(i + 1, n));
   return CharCaseCmp(c1, c2);
 }

 INTERCEPTOR(int, strncmp, const char *s1, const char *s2, size_t size) {
   // strncmp is called from malloc_default_purgeable_zone()
   // in __asan::ReplaceSystemAlloc() on Mac.
   if (asan_init_is_running) {
     return REAL(strncmp)(s1, s2, size);
   }
   unsigned char c1 = 0, c2 = 0;
   size_t i;
   for (i = 0; i < size; i++) {
     c1 = (unsigned char)s1[i];
     c2 = (unsigned char)s2[i];
     if (c1 != c2 || c1 == '\0') break;
   }
   ASAN_READ_RANGE(s1, Min(i + 1, size));
   ASAN_READ_RANGE(s2, Min(i + 1, size));
   return CharCmp(c1, c2);
 }

 INTERCEPTOR(char*, strncpy, char *to, const char *from, size_t size) {
   ENSURE_ASAN_INITED();
   if (FLAG_replace_str) {
     size_t from_size = Min(size, internal_strnlen(from, size) + 1);
     CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size);
     ASAN_READ_RANGE(from, from_size);
     ASAN_WRITE_RANGE(to, size);
   }
   return REAL(strncpy)(to, from, size);
 }

 #ifndef __APPLE__
 INTERCEPTOR(size_t, strnlen, const char *s, size_t maxlen) {
   ENSURE_ASAN_INITED();
   size_t length = REAL(strnlen)(s, maxlen);
   if (FLAG_replace_str) {
     ASAN_READ_RANGE(s, Min(length + 1, maxlen));
   }
   return length;
 }
 #endif

 #if defined(_WIN32)
 INTERCEPTOR_WINAPI(DWORD, CreateThread,
                    void* security, size_t stack_size,
                    DWORD (__stdcall *start_routine)(void*), void* arg,
                    DWORD flags, void* tid) {
   GET_STACK_TRACE_HERE(kStackTraceMax);
   int current_tid = asanThreadRegistry().GetCurrentTidOrMinusOne();
   AsanThread *t = AsanThread::Create(current_tid, start_routine, arg, &stack);
   asanThreadRegistry().RegisterThread(t);
   return REAL(CreateThread)(security, stack_size,
                             asan_thread_start, t, flags, tid);
 }

 namespace __asan {
 void InitializeWindowsInterceptors() {
   CHECK(INTERCEPT_FUNCTION(CreateThread));
 }

 }  // namespace __asan
 #endif

 // ---------------------- InitializeAsanInterceptors ---------------- {{{1
 namespace __asan {
 void InitializeAsanInterceptors() {
   // Intercept mem* functions.
   CHECK(INTERCEPT_FUNCTION(memcmp));
   CHECK(INTERCEPT_FUNCTION(memmove));
   CHECK(INTERCEPT_FUNCTION(memset));
 #ifdef __APPLE__
   // Wrap memcpy() on OS X 10.6 only, because on 10.7 memcpy() and memmove()
   // are resolved into memmove$VARIANT$sse42.
   // See also http://code.google.com/p/address-sanitizer/issues/detail?id=34.
   // TODO(glider): need to check dynamically that memcpy() and memmove() are
   // actually the same function.
   if (GetMacosVersion() == MACOS_VERSION_SNOW_LEOPARD) {
     CHECK(INTERCEPT_FUNCTION(memcpy));
   } else {
     REAL(memcpy) = REAL(memmove);
   }
 #else
   // Always wrap memcpy() on non-Darwin platforms.
   CHECK(INTERCEPT_FUNCTION(memcpy));
 #endif

   // Intercept str* functions.
   CHECK(INTERCEPT_FUNCTION(strcat));  // NOLINT
   CHECK(INTERCEPT_FUNCTION(strchr));
   CHECK(INTERCEPT_FUNCTION(strcmp));
   CHECK(INTERCEPT_FUNCTION(strcpy));  // NOLINT
   CHECK(INTERCEPT_FUNCTION(strlen));
   CHECK(INTERCEPT_FUNCTION(strncmp));
   CHECK(INTERCEPT_FUNCTION(strncpy));
 #if !defined(_WIN32)
   CHECK(INTERCEPT_FUNCTION(strcasecmp));
   CHECK(INTERCEPT_FUNCTION(strdup));
   CHECK(INTERCEPT_FUNCTION(strncasecmp));
 # ifndef __APPLE__
   CHECK(INTERCEPT_FUNCTION(index));
 # else
   CHECK(OVERRIDE_FUNCTION(index, WRAP(strchr)));
 # endif
 #endif
 #if !defined(__APPLE__)
   CHECK(INTERCEPT_FUNCTION(strnlen));
 #endif

   // Intecept signal- and jump-related functions.
   CHECK(INTERCEPT_FUNCTION(longjmp));
 #if !defined(ANDROID) && !defined(_WIN32)
   CHECK(INTERCEPT_FUNCTION(sigaction));
   CHECK(INTERCEPT_FUNCTION(signal));
 #endif

 #if !defined(_WIN32)
   CHECK(INTERCEPT_FUNCTION(_longjmp));
   INTERCEPT_FUNCTION(__cxa_throw);
 # if !defined(__APPLE__)
   // On Darwin siglongjmp tailcalls longjmp, so we don't want to intercept it
   // there.
   CHECK(INTERCEPT_FUNCTION(siglongjmp));
 # endif
 #endif

   // Intercept threading-related functions
 #if !defined(_WIN32)
   CHECK(INTERCEPT_FUNCTION(pthread_create));
 # if defined(__APPLE__)
   // We don't need to intercept pthread_workqueue_additem_np() to support the
   // libdispatch API, but it helps us to debug the unsupported functions. Let's
   // intercept it only during verbose runs.
   if (FLAG_v >= 2) {
     CHECK(INTERCEPT_FUNCTION(pthread_workqueue_additem_np));
   }
 # endif
 #endif

   // Some Windows-specific interceptors.
 #if defined(_WIN32)
   InitializeWindowsInterceptors();
 #endif

   // Some Mac-specific interceptors.
 #if defined(__APPLE__)
   CHECK(INTERCEPT_FUNCTION(dispatch_async_f));
   CHECK(INTERCEPT_FUNCTION(dispatch_sync_f));
   CHECK(INTERCEPT_FUNCTION(dispatch_after_f));
   CHECK(INTERCEPT_FUNCTION(dispatch_barrier_async_f));
   CHECK(INTERCEPT_FUNCTION(dispatch_group_async_f));

   // Normally CFStringCreateCopy should not copy constant CF strings.
   // Replacing the default CFAllocator causes constant strings to be copied
   // rather than just returned, which leads to bugs in big applications like
   // Chromium and WebKit, see
   // http://code.google.com/p/address-sanitizer/issues/detail?id=10
   // Until this problem is fixed we need to check that the string is
   // non-constant before calling CFStringCreateCopy.
   CHECK(INTERCEPT_FUNCTION(CFStringCreateCopy));
 #endif

   if (FLAG_v > 0) {
     Printf("AddressSanitizer: libc interceptors initialized\n");
   }
 }

 }  // namespace __asan
	//===-- asan_interceptors.cc ------------------------------------- C++ --===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file is a part of AddressSanitizer, an address sanity checker.
	//
	// Intercept various libc functions.
	//===----------------------------------------------------------------------===//
	#include "asan_interceptors.h"

	#include "asan_allocator.h"
	#include "asan_interface.h"
	#include "asan_internal.h"
	#include "asan_mac.h"
	#include "asan_mapping.h"
	#include "asan_stack.h"
	#include "asan_stats.h"
	#include "asan_thread_registry.h"
	#include "interception/interception.h"

	#include <new>

	#if defined(__APPLE__)
	// FIXME(samsonov): Gradually replace system headers with declarations of
	// intercepted functions.
	#include <pthread.h>
	#include <signal.h>
	#include <string.h>
	#include <strings.h>
	#endif // __APPLE__

	namespace __asan {

	// Instruments read/write access to a single byte in memory.
	// On error calls __asan_report_error, which aborts the program.
	static NOINLINE void AccessAddress(uintptr_t address, bool isWrite) {
	if (__asan_address_is_poisoned((void*)address)) {
	GET_BP_PC_SP;
	__asan_report_error(pc, bp, sp, address, isWrite, /* access_size */ 1);
	}
	}

	// We implement ACCESS_MEMORY_RANGE, ASAN_READ_RANGE,
	// and ASAN_WRITE_RANGE as macro instead of function so
	// that no extra frames are created, and stack trace contains
	// relevant information only.

	// Instruments read/write access to a memory range.
	// More complex implementation is possible, for now just
	// checking the first and the last byte of a range.
	#define ACCESS_MEMORY_RANGE(offset, size, isWrite) do { \
	if (size > 0) { \
	uintptr_t ptr = (uintptr_t)(offset); \
	AccessAddress(ptr, isWrite); \
	AccessAddress(ptr + (size) - 1, isWrite); \
	} \
	} while (0)

	#define ASAN_READ_RANGE(offset, size) do { \
	ACCESS_MEMORY_RANGE(offset, size, false); \
	} while (0)

	#define ASAN_WRITE_RANGE(offset, size) do { \
	ACCESS_MEMORY_RANGE(offset, size, true); \
	} while (0)

	// Behavior of functions like "memcpy" or "strcpy" is undefined
	// if memory intervals overlap. We report error in this case.
	// Macro is used to avoid creation of new frames.
	static inline bool RangesOverlap(const char *offset1, size_t length1,
	const char *offset2, size_t length2) {
	return !((offset1 + length1 <= offset2) \|\| (offset2 + length2 <= offset1));
	}
	#define CHECK_RANGES_OVERLAP(name, _offset1, length1, _offset2, length2) do { \
	const char offset1 = (const char)_offset1; \
	const char offset2 = (const char)_offset2; \
	if (RangesOverlap(offset1, length1, offset2, length2)) { \
	Report("ERROR: AddressSanitizer %s-param-overlap: " \
	"memory ranges [%p,%p) and [%p, %p) overlap\n", \
	name, offset1, offset1 + length1, offset2, offset2 + length2); \
	PRINT_CURRENT_STACK(); \
	ShowStatsAndAbort(); \
	} \
	} while (0)

	#define ENSURE_ASAN_INITED() do { \
	CHECK(!asan_init_is_running); \
	if (!asan_inited) { \
	__asan_init(); \
	} \
	} while (0)

	static inline bool IsSpace(int c) {
	return (c == ' ') \|\| (c == '\n') \|\| (c == '\t') \|\|
	(c == '\f') \|\| (c == '\r') \|\| (c == '\v');
	}

	static inline bool IsDigit(int c) {
	return (c >= '0') && (c <= '9');
	}

	static inline int ToLower(int c) {
	return (c >= 'A' && c <= 'Z') ? (c + 'a' - 'A') : c;
	}

	// ---------------------- Internal string functions ---------------- {{{1

	int64_t internal_simple_strtoll(const char nptr, char *endptr, int base) {
	CHECK(base == 10);
	while (IsSpace(*nptr)) nptr++;
	int sgn = 1;
	uint64_t res = 0;
	bool have_digits = false;
	char old_nptr = (char)nptr;
	if (*nptr == '+') {
	sgn = 1;
	nptr++;
	} else if (*nptr == '-') {
	sgn = -1;
	nptr++;
	}
	while (IsDigit(*nptr)) {
	res = (res <= UINT64_MAX / 10) ? res * 10 : UINT64_MAX;
	int digit = ((*nptr) - '0');
	res = (res <= UINT64_MAX - digit) ? res + digit : UINT64_MAX;
	have_digits = true;
	nptr++;
	}
	if (endptr != NULL) {
	endptr = (have_digits) ? (char)nptr : old_nptr;
	}
	if (sgn > 0) {
	return (int64_t)(Min((uint64_t)INT64_MAX, res));
	} else {
	return (res > INT64_MAX) ? INT64_MIN : ((int64_t)res * -1);
	}
	}

	int64_t internal_atoll(const char *nptr) {
	return internal_simple_strtoll(nptr, (char**)NULL, 10);
	}

	size_t internal_strlen(const char *s) {
	size_t i = 0;
	while (s[i]) i++;
	return i;
	}

	size_t internal_strnlen(const char *s, size_t maxlen) {
	#ifndef __APPLE__
	if (REAL(strnlen) != NULL) {
	return REAL(strnlen)(s, maxlen);
	}
	#endif
	size_t i = 0;
	while (i < maxlen && s[i]) i++;
	return i;
	}

	char* internal_strchr(const char *s, int c) {
	while (true) {
	if (*s == (char)c)
	return (char*)s;
	if (*s == 0)
	return NULL;
	s++;
	}
	}

	void* internal_memchr(const void* s, int c, size_t n) {
	const char* t = (char*)s;
	for (size_t i = 0; i < n; ++i, ++t)
	if (*t == c)
	return (void*)t;
	return NULL;
	}

	int internal_memcmp(const void* s1, const void* s2, size_t n) {
	const char* t1 = (char*)s1;
	const char* t2 = (char*)s2;
	for (size_t i = 0; i < n; ++i, ++t1, ++t2)
	if (t1 != t2)
	return t1 < t2 ? -1 : 1;
	return 0;
	}

	char internal_strstr(const char haystack, const char *needle) {
	// This is O(N^2), but we are not using it in hot places.
	size_t len1 = internal_strlen(haystack);
	size_t len2 = internal_strlen(needle);
	if (len1 < len2) return 0;
	for (size_t pos = 0; pos <= len1 - len2; pos++) {
	if (internal_memcmp(haystack + pos, needle, len2) == 0)
	return (char*)haystack + pos;
	}
	return 0;
	}

	char internal_strncat(char dst, const char *src, size_t n) {
	size_t len = internal_strlen(dst);
	size_t i;
	for (i = 0; i < n && src[i]; i++)
	dst[len + i] = src[i];
	dst[len + i] = 0;
	return dst;
	}

	int internal_strcmp(const char s1, const char s2) {
	while (true) {
	unsigned c1 = *s1;
	unsigned c2 = *s2;
	if (c1 != c2) return (c1 < c2) ? -1 : 1;
	if (c1 == 0) break;
	s1++;
	s2++;
	}
	return 0;
	}

	} // namespace __asan

	// ---------------------- Wrappers ---------------- {{{1
	using namespace __asan; // NOLINT

	#define OPERATOR_NEW_BODY \
	GET_STACK_TRACE_HERE_FOR_MALLOC;\
	return asan_memalign(0, size, &stack);

	#ifdef ANDROID
	void *operator new(size_t size) { OPERATOR_NEW_BODY; }
	void *operator new[](size_t size) { OPERATOR_NEW_BODY; }
	#else
	void *operator new(size_t size) throw(std::bad_alloc) { OPERATOR_NEW_BODY; }
	void *operator new[](size_t size) throw(std::bad_alloc) { OPERATOR_NEW_BODY; }
	void *operator new(size_t size, std::nothrow_t const&) throw()
	{ OPERATOR_NEW_BODY; }
	void *operator new[](size_t size, std::nothrow_t const&) throw()
	{ OPERATOR_NEW_BODY; }
	#endif

	#define OPERATOR_DELETE_BODY \
	GET_STACK_TRACE_HERE_FOR_FREE(ptr);\
	asan_free(ptr, &stack);

	void operator delete(void *ptr) throw() { OPERATOR_DELETE_BODY; }
	void operator delete[](void *ptr) throw() { OPERATOR_DELETE_BODY; }
	void operator delete(void *ptr, std::nothrow_t const&) throw()
	{ OPERATOR_DELETE_BODY; }
	void operator delete[](void *ptr, std::nothrow_t const&) throw()
	{ OPERATOR_DELETE_BODY;}

	static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
	AsanThread t = (AsanThread)arg;
	asanThreadRegistry().SetCurrent(t);
	return t->ThreadStart();
	}

	#ifndef _WIN32
	INTERCEPTOR(int, pthread_create, void *thread,
	void attr, void (start_routine)(void), void *arg) {
	GET_STACK_TRACE_HERE(kStackTraceMax);
	int current_tid = asanThreadRegistry().GetCurrentTidOrMinusOne();
	AsanThread *t = AsanThread::Create(current_tid, start_routine, arg, &stack);
	asanThreadRegistry().RegisterThread(t);
	return REAL(pthread_create)(thread, attr, asan_thread_start, t);
	}
	#endif // !_WIN32

	#if !defined(ANDROID) && !defined(_WIN32)
	INTERCEPTOR(void, signal, int signum, void handler) {
	if (!AsanInterceptsSignal(signum)) {
	return REAL(signal)(signum, handler);
	}
	return NULL;
	}

	INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
	struct sigaction *oldact) {
	if (!AsanInterceptsSignal(signum)) {
	return REAL(sigaction)(signum, act, oldact);
	}
	return 0;
	}
	#endif // !ANDROID && !_WIN32

	INTERCEPTOR(void, longjmp, void *env, int val) {
	__asan_handle_no_return();
	REAL(longjmp)(env, val);
	}

	#if !defined(_WIN32)
	INTERCEPTOR(void, _longjmp, void *env, int val) {
	__asan_handle_no_return();
	REAL(_longjmp)(env, val);
	}

	INTERCEPTOR(void, siglongjmp, void *env, int val) {
	__asan_handle_no_return();
	REAL(siglongjmp)(env, val);
	}
	#endif

	#if ASAN_HAS_EXCEPTIONS == 1
	#ifdef __APPLE__
	extern "C" void __cxa_throw(void a, void b, void *c);
	#endif // __APPLE__

	INTERCEPTOR(void, __cxa_throw, void a, void b, void *c) {
	CHECK(REAL(__cxa_throw));
	__asan_handle_no_return();
	REAL(__cxa_throw)(a, b, c);
	}
	#endif

	// intercept mlock and friends.
	// Since asan maps 16T of RAM, mlock is completely unfriendly to asan.
	// All functions return 0 (success).
	static void MlockIsUnsupported() {
	static bool printed = 0;
	if (printed) return;
	printed = true;
	Printf("INFO: AddressSanitizer ignores mlock/mlockall/munlock/munlockall\n");
	}

	extern "C" {
	INTERCEPTOR_ATTRIBUTE
	int mlock(const void *addr, size_t len) {
	MlockIsUnsupported();
	return 0;
	}

	INTERCEPTOR_ATTRIBUTE
	int munlock(const void *addr, size_t len) {
	MlockIsUnsupported();
	return 0;
	}

	INTERCEPTOR_ATTRIBUTE
	int mlockall(int flags) {
	MlockIsUnsupported();
	return 0;
	}

	INTERCEPTOR_ATTRIBUTE
	int munlockall(void) {
	MlockIsUnsupported();
	return 0;
	}
	} // extern "C"

	static inline int CharCmp(unsigned char c1, unsigned char c2) {
	return (c1 == c2) ? 0 : (c1 < c2) ? -1 : 1;
	}

	static inline int CharCaseCmp(unsigned char c1, unsigned char c2) {
	int c1_low = ToLower(c1);
	int c2_low = ToLower(c2);
	return c1_low - c2_low;
	}

	INTERCEPTOR(int, memcmp, const void a1, const void a2, size_t size) {
	ENSURE_ASAN_INITED();
	unsigned char c1 = 0, c2 = 0;
	const unsigned char s1 = (const unsigned char)a1;
	const unsigned char s2 = (const unsigned char)a2;
	size_t i;
	for (i = 0; i < size; i++) {
	c1 = s1[i];
	c2 = s2[i];
	if (c1 != c2) break;
	}
	ASAN_READ_RANGE(s1, Min(i + 1, size));
	ASAN_READ_RANGE(s2, Min(i + 1, size));
	return CharCmp(c1, c2);
	}

	INTERCEPTOR(void, memcpy, void to, const void *from, size_t size) {
	// memcpy is called during __asan_init() from the internals
	// of printf(...).
	if (asan_init_is_running) {
	return REAL(memcpy)(to, from, size);
	}
	ENSURE_ASAN_INITED();
	if (FLAG_replace_intrin) {
	if (to != from) {
	// We do not treat memcpy with to==from as a bug.
	// See http://llvm.org/bugs/show_bug.cgi?id=11763.
	CHECK_RANGES_OVERLAP("memcpy", to, size, from, size);
	}
	ASAN_WRITE_RANGE(from, size);
	ASAN_READ_RANGE(to, size);
	}
	return REAL(memcpy)(to, from, size);
	}

	INTERCEPTOR(void, memmove, void to, const void *from, size_t size) {
	ENSURE_ASAN_INITED();
	if (FLAG_replace_intrin) {
	ASAN_WRITE_RANGE(from, size);
	ASAN_READ_RANGE(to, size);
	}
	return REAL(memmove)(to, from, size);
	}

	INTERCEPTOR(void, memset, void block, int c, size_t size) {
	// memset is called inside INTERCEPT_FUNCTION on Mac.
	if (asan_init_is_running) {
	return REAL(memset)(block, c, size);
	}
	ENSURE_ASAN_INITED();
	if (FLAG_replace_intrin) {
	ASAN_WRITE_RANGE(block, size);
	}
	return REAL(memset)(block, c, size);
	}

	INTERCEPTOR(char, strchr, const char str, int c) {
	ENSURE_ASAN_INITED();
	char *result = REAL(strchr)(str, c);
	if (FLAG_replace_str) {
	size_t bytes_read = (result ? result - str : REAL(strlen)(str)) + 1;
	ASAN_READ_RANGE(str, bytes_read);
	}
	return result;
	}

	#ifdef __linux__
	INTERCEPTOR(char, index, const char string, int c)
	ALIAS(WRAPPER_NAME(strchr));
	#else
	DEFINE_REAL(char, index, const char string, int c);
	#endif

	#ifdef ANDROID
	DEFINE_REAL(int, sigaction, int signum, const struct sigaction *act,
	struct sigaction *oldact);
	#endif

	INTERCEPTOR(int, strcasecmp, const char s1, const char s2) {
	ENSURE_ASAN_INITED();
	unsigned char c1, c2;
	size_t i;
	for (i = 0; ; i++) {
	c1 = (unsigned char)s1[i];
	c2 = (unsigned char)s2[i];
	if (CharCaseCmp(c1, c2) != 0 \|\| c1 == '\0') break;
	}
	ASAN_READ_RANGE(s1, i + 1);
	ASAN_READ_RANGE(s2, i + 1);
	return CharCaseCmp(c1, c2);
	}

	INTERCEPTOR(char, strcat, char to, const char *from) { // NOLINT
	ENSURE_ASAN_INITED();
	if (FLAG_replace_str) {
	size_t from_length = REAL(strlen)(from);
	ASAN_READ_RANGE(from, from_length + 1);
	if (from_length > 0) {
	size_t to_length = REAL(strlen)(to);
	ASAN_READ_RANGE(to, to_length);
	ASAN_WRITE_RANGE(to + to_length, from_length + 1);
	CHECK_RANGES_OVERLAP("strcat", to, to_length + 1, from, from_length + 1);
	}
	}
	return REAL(strcat)(to, from); // NOLINT
	}

	INTERCEPTOR(int, strcmp, const char s1, const char s2) {
	if (!asan_inited) {
	return internal_strcmp(s1, s2);
	}
	unsigned char c1, c2;
	size_t i;
	for (i = 0; ; i++) {
	c1 = (unsigned char)s1[i];
	c2 = (unsigned char)s2[i];
	if (c1 != c2 \|\| c1 == '\0') break;
	}
	ASAN_READ_RANGE(s1, i + 1);
	ASAN_READ_RANGE(s2, i + 1);
	return CharCmp(c1, c2);
	}

	INTERCEPTOR(char, strcpy, char to, const char *from) { // NOLINT
	// strcpy is called from malloc_default_purgeable_zone()
	// in __asan::ReplaceSystemAlloc() on Mac.
	if (asan_init_is_running) {
	return REAL(strcpy)(to, from); // NOLINT
	}
	ENSURE_ASAN_INITED();
	if (FLAG_replace_str) {
	size_t from_size = REAL(strlen)(from) + 1;
	CHECK_RANGES_OVERLAP("strcpy", to, from_size, from, from_size);
	ASAN_READ_RANGE(from, from_size);
	ASAN_WRITE_RANGE(to, from_size);
	}
	return REAL(strcpy)(to, from); // NOLINT
	}

	INTERCEPTOR(char, strdup, const char s) {
	ENSURE_ASAN_INITED();
	if (FLAG_replace_str) {
	size_t length = REAL(strlen)(s);
	ASAN_READ_RANGE(s, length + 1);
	}
	return REAL(strdup)(s);
	}

	INTERCEPTOR(size_t, strlen, const char *s) {
	// strlen is called from malloc_default_purgeable_zone()
	// in __asan::ReplaceSystemAlloc() on Mac.
	if (asan_init_is_running) {
	return REAL(strlen)(s);
	}
	ENSURE_ASAN_INITED();
	size_t length = REAL(strlen)(s);
	if (FLAG_replace_str) {
	ASAN_READ_RANGE(s, length + 1);
	}
	return length;
	}

	INTERCEPTOR(int, strncasecmp, const char s1, const char s2, size_t n) {
	ENSURE_ASAN_INITED();
	unsigned char c1 = 0, c2 = 0;
	size_t i;
	for (i = 0; i < n; i++) {
	c1 = (unsigned char)s1[i];
	c2 = (unsigned char)s2[i];
	if (CharCaseCmp(c1, c2) != 0 \|\| c1 == '\0') break;
	}
	ASAN_READ_RANGE(s1, Min(i + 1, n));
	ASAN_READ_RANGE(s2, Min(i + 1, n));
	return CharCaseCmp(c1, c2);
	}

	INTERCEPTOR(int, strncmp, const char s1, const char s2, size_t size) {
	// strncmp is called from malloc_default_purgeable_zone()
	// in __asan::ReplaceSystemAlloc() on Mac.
	if (asan_init_is_running) {
	return REAL(strncmp)(s1, s2, size);
	}
	unsigned char c1 = 0, c2 = 0;
	size_t i;
	for (i = 0; i < size; i++) {
	c1 = (unsigned char)s1[i];
	c2 = (unsigned char)s2[i];
	if (c1 != c2 \|\| c1 == '\0') break;
	}
	ASAN_READ_RANGE(s1, Min(i + 1, size));
	ASAN_READ_RANGE(s2, Min(i + 1, size));
	return CharCmp(c1, c2);
	}

	INTERCEPTOR(char, strncpy, char to, const char *from, size_t size) {
	ENSURE_ASAN_INITED();
	if (FLAG_replace_str) {
	size_t from_size = Min(size, internal_strnlen(from, size) + 1);
	CHECK_RANGES_OVERLAP("strncpy", to, from_size, from, from_size);
	ASAN_READ_RANGE(from, from_size);
	ASAN_WRITE_RANGE(to, size);
	}
	return REAL(strncpy)(to, from, size);
	}

	#ifndef __APPLE__
	INTERCEPTOR(size_t, strnlen, const char *s, size_t maxlen) {
	ENSURE_ASAN_INITED();
	size_t length = REAL(strnlen)(s, maxlen);
	if (FLAG_replace_str) {
	ASAN_READ_RANGE(s, Min(length + 1, maxlen));
	}
	return length;
	}
	#endif

	#if defined(_WIN32)
	INTERCEPTOR_WINAPI(DWORD, CreateThread,
	void* security, size_t stack_size,
	DWORD (__stdcall start_routine)(void), void* arg,
	DWORD flags, void* tid) {
	GET_STACK_TRACE_HERE(kStackTraceMax);
	int current_tid = asanThreadRegistry().GetCurrentTidOrMinusOne();
	AsanThread *t = AsanThread::Create(current_tid, start_routine, arg, &stack);
	asanThreadRegistry().RegisterThread(t);
	return REAL(CreateThread)(security, stack_size,
	asan_thread_start, t, flags, tid);
	}

	namespace __asan {
	void InitializeWindowsInterceptors() {
	CHECK(INTERCEPT_FUNCTION(CreateThread));
	}

	} // namespace __asan
	#endif

	// ---------------------- InitializeAsanInterceptors ---------------- {{{1
	namespace __asan {
	void InitializeAsanInterceptors() {
	// Intercept mem* functions.
	CHECK(INTERCEPT_FUNCTION(memcmp));
	CHECK(INTERCEPT_FUNCTION(memmove));
	CHECK(INTERCEPT_FUNCTION(memset));
	#ifdef __APPLE__
	// Wrap memcpy() on OS X 10.6 only, because on 10.7 memcpy() and memmove()
	// are resolved into memmove$VARIANT$sse42.
	// See also http://code.google.com/p/address-sanitizer/issues/detail?id=34.
	// TODO(glider): need to check dynamically that memcpy() and memmove() are
	// actually the same function.
	if (GetMacosVersion() == MACOS_VERSION_SNOW_LEOPARD) {
	CHECK(INTERCEPT_FUNCTION(memcpy));
	} else {
	REAL(memcpy) = REAL(memmove);
	}
	#else
	// Always wrap memcpy() on non-Darwin platforms.
	CHECK(INTERCEPT_FUNCTION(memcpy));
	#endif

	// Intercept str* functions.
	CHECK(INTERCEPT_FUNCTION(strcat)); // NOLINT
	CHECK(INTERCEPT_FUNCTION(strchr));
	CHECK(INTERCEPT_FUNCTION(strcmp));
	CHECK(INTERCEPT_FUNCTION(strcpy)); // NOLINT
	CHECK(INTERCEPT_FUNCTION(strlen));
	CHECK(INTERCEPT_FUNCTION(strncmp));
	CHECK(INTERCEPT_FUNCTION(strncpy));
	#if !defined(_WIN32)
	CHECK(INTERCEPT_FUNCTION(strcasecmp));
	CHECK(INTERCEPT_FUNCTION(strdup));
	CHECK(INTERCEPT_FUNCTION(strncasecmp));
	# ifndef __APPLE__
	CHECK(INTERCEPT_FUNCTION(index));
	# else
	CHECK(OVERRIDE_FUNCTION(index, WRAP(strchr)));
	# endif
	#endif
	#if !defined(__APPLE__)
	CHECK(INTERCEPT_FUNCTION(strnlen));
	#endif

	// Intecept signal- and jump-related functions.
	CHECK(INTERCEPT_FUNCTION(longjmp));
	#if !defined(ANDROID) && !defined(_WIN32)
	CHECK(INTERCEPT_FUNCTION(sigaction));
	CHECK(INTERCEPT_FUNCTION(signal));
	#endif

	#if !defined(_WIN32)
	CHECK(INTERCEPT_FUNCTION(_longjmp));
	INTERCEPT_FUNCTION(__cxa_throw);
	# if !defined(__APPLE__)
	// On Darwin siglongjmp tailcalls longjmp, so we don't want to intercept it
	// there.
	CHECK(INTERCEPT_FUNCTION(siglongjmp));
	# endif
	#endif

	// Intercept threading-related functions
	#if !defined(_WIN32)
	CHECK(INTERCEPT_FUNCTION(pthread_create));
	# if defined(__APPLE__)
	// We don't need to intercept pthread_workqueue_additem_np() to support the
	// libdispatch API, but it helps us to debug the unsupported functions. Let's
	// intercept it only during verbose runs.
	if (FLAG_v >= 2) {
	CHECK(INTERCEPT_FUNCTION(pthread_workqueue_additem_np));
	}
	# endif
	#endif

	// Some Windows-specific interceptors.
	#if defined(_WIN32)
	InitializeWindowsInterceptors();
	#endif

	// Some Mac-specific interceptors.
	#if defined(__APPLE__)
	CHECK(INTERCEPT_FUNCTION(dispatch_async_f));
	CHECK(INTERCEPT_FUNCTION(dispatch_sync_f));
	CHECK(INTERCEPT_FUNCTION(dispatch_after_f));
	CHECK(INTERCEPT_FUNCTION(dispatch_barrier_async_f));
	CHECK(INTERCEPT_FUNCTION(dispatch_group_async_f));

	// Normally CFStringCreateCopy should not copy constant CF strings.
	// Replacing the default CFAllocator causes constant strings to be copied
	// rather than just returned, which leads to bugs in big applications like
	// Chromium and WebKit, see
	// http://code.google.com/p/address-sanitizer/issues/detail?id=10
	// Until this problem is fixed we need to check that the string is
	// non-constant before calling CFStringCreateCopy.
	CHECK(INTERCEPT_FUNCTION(CFStringCreateCopy));
	#endif

	if (FLAG_v > 0) {
	Printf("AddressSanitizer: libc interceptors initialized\n");
	}
	}

	} // namespace __asan