macOS: Shim all malloc zones.

base/allocator/allocator_shim_default_dispatch_to_mac_zoned_malloc.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/allocator/allocator_shim_default_dispatch_to_mac_zoned_malloc.h"
 
 #include <utility>
 
 #include "base/allocator/allocator_interception_mac.h"
 #include "base/allocator/allocator_shim.h"
-#include "base/logging.h"
+#include "base/allocator/malloc_zone_functions_mac.h"
 
 namespace base {
 namespace allocator {
-
 namespace {
 
-// This is the zone that the allocator shim will call to actually perform heap
-// allocations. It should be populated with the original, unintercepted default
-// malloc zone.
-MallocZoneFunctions g_default_zone;
-
 void* MallocImpl(const AllocatorDispatch*, size_t size, void* context) {
-  return g_default_zone.malloc(
-      reinterpret_cast<struct _malloc_zone_t*>(context), size);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  return functions.malloc(reinterpret_cast<struct _malloc_zone_t*>(context),
+                          size);
 }
 
 void* CallocImpl(const AllocatorDispatch*,
                  size_t n,
                  size_t size,
                  void* context) {
-  return g_default_zone.calloc(
-      reinterpret_cast<struct _malloc_zone_t*>(context), n, size);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  return functions.calloc(reinterpret_cast<struct _malloc_zone_t*>(context), n,
+                          size);
 }
 
 void* MemalignImpl(const AllocatorDispatch*,
                    size_t alignment,
                    size_t size,
                    void* context) {
-  return g_default_zone.memalign(
-      reinterpret_cast<struct _malloc_zone_t*>(context), alignment, size);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  return functions.memalign(reinterpret_cast<struct _malloc_zone_t*>(context),
+                            alignment, size);
 }
 
 void* ReallocImpl(const AllocatorDispatch*,
                   void* ptr,
                   size_t size,
                   void* context) {
-  return g_default_zone.realloc(
-      reinterpret_cast<struct _malloc_zone_t*>(context), ptr, size);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  return functions.realloc(reinterpret_cast<struct _malloc_zone_t*>(context),
+                           ptr, size);
 }
 
 void FreeImpl(const AllocatorDispatch*, void* ptr, void* context) {
-  g_default_zone.free(reinterpret_cast<struct _malloc_zone_t*>(context), ptr);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  functions.free(reinterpret_cast<struct _malloc_zone_t*>(context), ptr);
 }
 
 size_t GetSizeEstimateImpl(const AllocatorDispatch*, void* ptr, void* context) {
-  return g_default_zone.size(reinterpret_cast<struct _malloc_zone_t*>(context),
-                             ptr);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  return functions.size(reinterpret_cast<struct _malloc_zone_t*>(context), ptr);
 }
 
 unsigned BatchMallocImpl(const AllocatorDispatch* self,
                          size_t size,
                          void** results,
                          unsigned num_requested,
                          void* context) {
-  return g_default_zone.batch_malloc(
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  return functions.batch_malloc(
       reinterpret_cast<struct _malloc_zone_t*>(context), size, results,
       num_requested);
 }
 
 void BatchFreeImpl(const AllocatorDispatch* self,
                    void** to_be_freed,
                    unsigned num_to_be_freed,
                    void* context) {
-  g_default_zone.batch_free(reinterpret_cast<struct _malloc_zone_t*>(context),
-                            to_be_freed, num_to_be_freed);
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  functions.batch_free(reinterpret_cast<struct _malloc_zone_t*>(context),
+                       to_be_freed, num_to_be_freed);
 }
 
 void FreeDefiniteSizeImpl(const AllocatorDispatch* self,
                           void* ptr,
                           size_t size,
                           void* context) {
-  g_default_zone.free_definite_size(
+  MallocZoneFunctions& functions = GetFunctionsForZone(context);
+  functions.free_definite_size(
       reinterpret_cast<struct _malloc_zone_t*>(context), ptr, size);
 }
 
 }  // namespace
 
 void InitializeDefaultDispatchToMacAllocator() {
-  StoreFunctionsForDefaultZone(&g_default_zone);
+  StoreFunctionsForAllZones();
 }
 
 const AllocatorDispatch AllocatorDispatch::default_dispatch = {
     &MallocImpl,           /* alloc_function */
     &CallocImpl,           /* alloc_zero_initialized_function */
     &MemalignImpl,         /* alloc_aligned_function */
     &ReallocImpl,          /* realloc_function */
     &FreeImpl,             /* free_function */
     &GetSizeEstimateImpl,  /* get_size_estimate_function */
     &BatchMallocImpl,      /* batch_malloc_function */
     &BatchFreeImpl,        /* batch_free_function */
     &FreeDefiniteSizeImpl, /* free_definite_size_function */
     nullptr,               /* next */
 };
 
 }  // namespace allocator
 }  // namespace base