Index: compiler-rt/trunk/lib/lsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/lsan/CMakeLists.txt
+++ compiler-rt/trunk/lib/lsan/CMakeLists.txt
@@ -13,6 +13,7 @@
   lsan_allocator.cc
   lsan_linux.cc
   lsan_interceptors.cc
+  lsan_malloc_mac.cc
   lsan_preinit.cc
   lsan_thread.cc)
 
Index: compiler-rt/trunk/lib/lsan/lsan.h
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan.h
+++ compiler-rt/trunk/lib/lsan/lsan.h
@@ -41,6 +41,13 @@
 namespace __lsan {
 
 void InitializeInterceptors();
+void ReplaceSystemMalloc();
+
+#define ENSURE_LSAN_INITED do {   \
+  CHECK(!lsan_init_is_running);   \
+  if (!lsan_inited)               \
+    __lsan_init();                \
+} while (0)
 
 }  // namespace __lsan
 
Index: compiler-rt/trunk/lib/lsan/lsan.cc
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan.cc
+++ compiler-rt/trunk/lib/lsan/lsan.cc
@@ -76,6 +76,7 @@
   InitializeFlags();
   InitCommonLsan();
   InitializeAllocator();
+  ReplaceSystemMalloc();
   InitTlsSize();
   InitializeInterceptors();
   InitializeThreadRegistry();
Index: compiler-rt/trunk/lib/lsan/lsan_allocator.h
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan_allocator.h
+++ compiler-rt/trunk/lib/lsan/lsan_allocator.h
@@ -36,6 +36,8 @@
 void AllocatorThreadFinish();
 void InitializeAllocator();
 
+const bool kAlwaysClearMemory = true;
+
 struct ChunkMetadata {
   u8 allocated : 8;  // Must be first.
   ChunkTag tag : 2;
@@ -72,6 +74,15 @@
 typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
 
 AllocatorCache *GetAllocatorCache();
+
+void *lsan_memalign(uptr alignment, uptr size, const StackTrace &stack);
+void *lsan_malloc(uptr size, const StackTrace &stack);
+void lsan_free(void *p);
+void *lsan_realloc(void *p, uptr size, const StackTrace &stack);
+void *lsan_calloc(uptr nmemb, uptr size, const StackTrace &stack);
+void *lsan_valloc(uptr size, const StackTrace &stack);
+uptr lsan_mz_size(const void *p);
+
 }  // namespace __lsan
 
 #endif  // LSAN_ALLOCATOR_H
Index: compiler-rt/trunk/lib/lsan/lsan_allocator.cc
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan_allocator.cc
+++ compiler-rt/trunk/lib/lsan/lsan_allocator.cc
@@ -117,6 +117,37 @@
   return m->requested_size;
 }
 
+void *lsan_memalign(uptr alignment, uptr size, const StackTrace &stack) {
+  return Allocate(stack, size, alignment, kAlwaysClearMemory);
+}
+
+void *lsan_malloc(uptr size, const StackTrace &stack) {
+  return Allocate(stack, size, 1, kAlwaysClearMemory);
+}
+
+void lsan_free(void *p) {
+  Deallocate(p);
+}
+
+void *lsan_realloc(void *p, uptr size, const StackTrace &stack) {
+  return Reallocate(stack, p, size, 1);
+}
+
+void *lsan_calloc(uptr nmemb, uptr size, const StackTrace &stack) {
+  size *= nmemb;
+  return Allocate(stack, size, 1, true);
+}
+
+void *lsan_valloc(uptr size, const StackTrace &stack) {
+  if (size == 0)
+    size = GetPageSizeCached();
+  return Allocate(stack, size, GetPageSizeCached(), kAlwaysClearMemory);
+}
+
+uptr lsan_mz_size(const void *p) {
+  return GetMallocUsableSize(p);
+}
+
 ///// Interface to the common LSan module. /////
 
 void LockAllocator() {
Index: compiler-rt/trunk/lib/lsan/lsan_interceptors.cc
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan_interceptors.cc
+++ compiler-rt/trunk/lib/lsan/lsan_interceptors.cc
@@ -39,29 +39,22 @@
 int pthread_setspecific(unsigned key, const void *v);
 }
 
-#define ENSURE_LSAN_INITED do {   \
-  CHECK(!lsan_init_is_running);   \
-  if (!lsan_inited)               \
-    __lsan_init();                \
-} while (0)
-
 ///// Malloc/free interceptors. /////
 
-const bool kAlwaysClearMemory = true;
-
 namespace std {
   struct nothrow_t;
 }
 
+#if !SANITIZER_MAC
 INTERCEPTOR(void*, malloc, uptr size) {
   ENSURE_LSAN_INITED;
   GET_STACK_TRACE_MALLOC;
-  return Allocate(stack, size, 1, kAlwaysClearMemory);
+  return lsan_malloc(size, stack);
 }
 
 INTERCEPTOR(void, free, void *p) {
   ENSURE_LSAN_INITED;
-  Deallocate(p);
+  lsan_free(p);
 }
 
 INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) {
@@ -79,28 +72,42 @@
   if (CallocShouldReturnNullDueToOverflow(size, nmemb)) return nullptr;
   ENSURE_LSAN_INITED;
   GET_STACK_TRACE_MALLOC;
-  size *= nmemb;
-  return Allocate(stack, size, 1, true);
+  return lsan_calloc(nmemb, size, stack);
 }
 
 INTERCEPTOR(void*, realloc, void *q, uptr size) {
   ENSURE_LSAN_INITED;
   GET_STACK_TRACE_MALLOC;
-  return Reallocate(stack, q, size, 1);
+  return lsan_realloc(q, size, stack);
 }
 
+INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
+  ENSURE_LSAN_INITED;
+  GET_STACK_TRACE_MALLOC;
+  *memptr = lsan_memalign(alignment, size, stack);
+  // FIXME: Return ENOMEM if user requested more than max alloc size.
+  return 0;
+}
+
+INTERCEPTOR(void*, valloc, uptr size) {
+  ENSURE_LSAN_INITED;
+  GET_STACK_TRACE_MALLOC;
+  return lsan_valloc(size, stack);
+}
+#endif
+
 #if SANITIZER_INTERCEPT_MEMALIGN
 INTERCEPTOR(void*, memalign, uptr alignment, uptr size) {
   ENSURE_LSAN_INITED;
   GET_STACK_TRACE_MALLOC;
-  return Allocate(stack, size, alignment, kAlwaysClearMemory);
+  return lsan_memalign(alignment, size, stack);
 }
 #define LSAN_MAYBE_INTERCEPT_MEMALIGN INTERCEPT_FUNCTION(memalign)
 
 INTERCEPTOR(void *, __libc_memalign, uptr alignment, uptr size) {
   ENSURE_LSAN_INITED;
   GET_STACK_TRACE_MALLOC;
-  void *res = Allocate(stack, size, alignment, kAlwaysClearMemory);
+  void *res = lsan_memalign(alignment, size, stack);
   DTLS_on_libc_memalign(res, size);
   return res;
 }
@@ -114,29 +121,13 @@
 INTERCEPTOR(void*, aligned_alloc, uptr alignment, uptr size) {
   ENSURE_LSAN_INITED;
   GET_STACK_TRACE_MALLOC;
-  return Allocate(stack, size, alignment, kAlwaysClearMemory);
+  return lsan_memalign(alignment, size, stack);
 }
 #define LSAN_MAYBE_INTERCEPT_ALIGNED_ALLOC INTERCEPT_FUNCTION(aligned_alloc)
 #else
 #define LSAN_MAYBE_INTERCEPT_ALIGNED_ALLOC
 #endif
 
-INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) {
-  ENSURE_LSAN_INITED;
-  GET_STACK_TRACE_MALLOC;
-  *memptr = Allocate(stack, size, alignment, kAlwaysClearMemory);
-  // FIXME: Return ENOMEM if user requested more than max alloc size.
-  return 0;
-}
-
-INTERCEPTOR(void*, valloc, uptr size) {
-  ENSURE_LSAN_INITED;
-  GET_STACK_TRACE_MALLOC;
-  if (size == 0)
-    size = GetPageSizeCached();
-  return Allocate(stack, size, GetPageSizeCached(), kAlwaysClearMemory);
-}
-
 #if SANITIZER_INTERCEPT_MALLOC_USABLE_SIZE
 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
   ENSURE_LSAN_INITED;
Index: compiler-rt/trunk/lib/lsan/lsan_linux.cc
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan_linux.cc
+++ compiler-rt/trunk/lib/lsan/lsan_linux.cc
@@ -26,6 +26,8 @@
 static THREADLOCAL AllocatorCache allocator_cache;
 AllocatorCache *GetAllocatorCache() { return &allocator_cache; }
 
+void ReplaceSystemMalloc() {}
+
 } // namespace __lsan
 
 #endif // SANITIZER_LINUX
Index: compiler-rt/trunk/lib/lsan/lsan_malloc_mac.cc
===================================================================
--- compiler-rt/trunk/lib/lsan/lsan_malloc_mac.cc
+++ compiler-rt/trunk/lib/lsan/lsan_malloc_mac.cc
@@ -0,0 +1,55 @@
+//===-- lsan_malloc_mac.cc ------------------------------------------------===//
+//
+//                     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 LeakSanitizer (LSan), a memory leak detector.
+//
+// Mac-specific malloc interception.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_platform.h"
+#if SANITIZER_MAC
+
+#include "lsan.h"
+#include "lsan_allocator.h"
+#include "lsan_thread.h"
+
+using namespace __lsan;
+#define COMMON_MALLOC_ZONE_NAME "lsan"
+#define COMMON_MALLOC_ENTER() ENSURE_LSAN_INITED
+#define COMMON_MALLOC_SANITIZER_INITIALIZED lsan_inited
+#define COMMON_MALLOC_FORCE_LOCK()
+#define COMMON_MALLOC_FORCE_UNLOCK()
+#define COMMON_MALLOC_MEMALIGN(alignment, size) \
+  GET_STACK_TRACE_MALLOC; \
+  void *p = lsan_memalign(alignment, size, stack)
+#define COMMON_MALLOC_MALLOC(size) \
+  GET_STACK_TRACE_MALLOC; \
+  void *p = lsan_malloc(size, stack)
+#define COMMON_MALLOC_REALLOC(ptr, size) \
+  GET_STACK_TRACE_MALLOC; \
+  void *p = lsan_realloc(ptr, size, stack)
+#define COMMON_MALLOC_CALLOC(count, size) \
+  GET_STACK_TRACE_MALLOC; \
+  void *p = lsan_calloc(count, size, stack)
+#define COMMON_MALLOC_VALLOC(size) \
+  GET_STACK_TRACE_MALLOC; \
+  void *p = lsan_valloc(size, stack)
+#define COMMON_MALLOC_FREE(ptr) \
+  lsan_free(ptr)
+#define COMMON_MALLOC_SIZE(ptr) \
+  uptr size = lsan_mz_size(ptr)
+#define COMMON_MALLOC_FILL_STATS(zone, stats)
+#define COMMON_MALLOC_REPORT_UNKNOWN_REALLOC(ptr, zone_ptr, zone_name) \
+  (void)zone_name; \
+  Report("mz_realloc(%p) -- attempting to realloc unallocated memory.\n", ptr);
+#define COMMON_MALLOC_NAMESPACE __lsan
+
+#include "sanitizer_common/sanitizer_malloc_mac.inc"
+
+#endif // SANITIZER_MAC