allocator_interception_mac.h

// 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.

#ifndef BASE_ALLOCATOR_ALLOCATOR_INTERCEPTION_MAC_H_
#define BASE_ALLOCATOR_ALLOCATOR_INTERCEPTION_MAC_H_

#include <stddef.h>

#include "base/base_export.h"
#include "third_party/apple_apsl/malloc.h"

namespace base {
namespace allocator {

struct MallocZoneFunctions;

// This initializes AllocatorDispatch::default_dispatch by saving pointers to
// the functions in the current default malloc zone. This must be called before
// the default malloc zone is changed to have its intended effect.
void InitializeDefaultDispatchToMacAllocator();

// Saves the function pointers currently used by the default zone.
void StoreFunctionsForDefaultZone();

// Same as StoreFunctionsForDefaultZone, but for all malloc zones.
void StoreFunctionsForAllZones();

// For all malloc zones that have been stored, replace their functions with
// |functions|.
void ReplaceFunctionsForStoredZones(const MallocZoneFunctions* functions);

extern bool g_replaced_default_zone;

// Calls the original implementation of malloc/calloc prior to interception.
bool UncheckedMallocMac(size_t size, void** result);
bool UncheckedCallocMac(size_t num_items, size_t size, void** result);

// Intercepts calls to default and purgeable malloc zones. Intercepts Core
// Foundation and Objective-C allocations.
// Has no effect on the default malloc zone if the allocator shim already
// performs that interception.
BASE_EXPORT void InterceptAllocationsMac();

// Updates all malloc zones to use their original functions.
// Also calls ClearAllMallocZonesForTesting.
BASE_EXPORT void UninterceptMallocZonesForTesting();

// Periodically checks for, and shims new malloc zones. Stops checking after 1
// minute.
BASE_EXPORT void PeriodicallyShimNewMallocZones();

// Exposed for testing.
BASE_EXPORT void ShimNewMallocZones();
BASE_EXPORT void ReplaceZoneFunctions(ChromeMallocZone* zone,
                                      const MallocZoneFunctions* functions);

}  // namespace allocator
}  // namespace base

#endif  // BASE_ALLOCATOR_ALLOCATOR_INTERCEPTION_MAC_H_