base: Add support for malloc zones to the allocator shim

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"
 
 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) {
-  return g_default_zone.malloc(malloc_default_zone(), size);
+void* MallocImpl(const AllocatorDispatch*, size_t size, void* context) {
+  return g_default_zone.malloc(
+      reinterpret_cast<struct _malloc_zone_t*>(context), size);
 }
 
-void* CallocImpl(const AllocatorDispatch*, size_t n, size_t size) {
-  return g_default_zone.calloc(malloc_default_zone(), n, 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);
 }
 
-void* MemalignImpl(const AllocatorDispatch*, size_t alignment, size_t size) {
-  return g_default_zone.memalign(malloc_default_zone(), alignment, 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);
 }
 
-void* ReallocImpl(const AllocatorDispatch*, void* ptr, size_t size) {
-  return g_default_zone.realloc(malloc_default_zone(), ptr, 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);
 }
 
-void FreeImpl(const AllocatorDispatch*, void* ptr) {
-  g_default_zone.free(malloc_default_zone(), ptr);
+void FreeImpl(const AllocatorDispatch*, void* ptr, void* context) {
+  g_default_zone.free(reinterpret_cast<struct _malloc_zone_t*>(context), ptr);
 }
 
-size_t GetSizeEstimateImpl(const AllocatorDispatch*, void* ptr) {
-  return g_default_zone.size(malloc_default_zone(), ptr);
+size_t GetSizeEstimateImpl(const AllocatorDispatch*, void* ptr, void* context) {
+  return g_default_zone.size(reinterpret_cast<struct _malloc_zone_t*>(context),
+                             ptr);
 }
 
 unsigned BatchMallocImpl(const AllocatorDispatch* self,
                          size_t size,
                          void** results,
-                         unsigned num_requested) {
-  return g_default_zone.batch_malloc(malloc_default_zone(), size, results,
-                                     num_requested);
+                         unsigned num_requested,
+                         void* context) {
+  return g_default_zone.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) {
-  g_default_zone.batch_free(malloc_default_zone(), to_be_freed,
-                            num_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);
 }
 
 void FreeDefiniteSizeImpl(const AllocatorDispatch* self,
                           void* ptr,
-                          size_t size) {
-  g_default_zone.free_definite_size(malloc_default_zone(), ptr, size);
+                          size_t size,
+                          void* context) {
+  g_default_zone.free_definite_size(
+      reinterpret_cast<struct _malloc_zone_t*>(context), ptr, size);
 }
 
 }  // namespace
 
 void InitializeDefaultDispatchToMacAllocator() {
   StoreFunctionsForDefaultZone(&g_default_zone);
 }
 
 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