| // Copyright 2015 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 COMPONENTS_METRICS_LEAK_DETECTOR_CUSTOM_ALLOCATOR_H_ |
| #define COMPONENTS_METRICS_LEAK_DETECTOR_CUSTOM_ALLOCATOR_H_ |
| |
| #include <stddef.h> |
| |
| #include <type_traits> |
| |
| namespace metrics { |
| namespace leak_detector { |
| |
| // Custom allocator class to be passed to STLAllocator as a template argument. |
| // |
| // By default, CustomAllocator uses the default allocator (new/delete), but the |
| // caller of Initialize ()can provide a pair of alternative alloc/ free |
| // functions to use as an external allocator. |
| // |
| // This is a stateless class, but there is static data within the module that |
| // needs to be created and deleted. |
| // |
| // Not thread-safe. |
| class CustomAllocator { |
| public: |
| using AllocFunc = std::add_pointer<void*(size_t)>::type; |
| using FreeFunc = std::add_pointer<void(void*, size_t)>::type; |
| |
| // Initialize CustomAllocator to use the default allocator. |
| static void Initialize(); |
| |
| // Initialize CustomAllocator to use the given alloc/free functions. |
| static void Initialize(AllocFunc alloc_func, FreeFunc free_func); |
| |
| // Performs any cleanup required, e.g. unset custom functions. Returns true |
| // on success or false if something failed. |
| static bool Shutdown(); |
| |
| static bool IsInitialized(); |
| |
| // These functions must match the specifications in STLAllocator. |
| static void* Allocate(size_t size); |
| static void Free(void* ptr, size_t size); |
| }; |
| |
| } // namespace leak_detector |
| } // namespace metrics |
| |
| #endif // COMPONENTS_METRICS_LEAK_DETECTOR_CUSTOM_ALLOCATOR_H_ |