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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_ | 5 #ifndef BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_ |
6 #define BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_ | 6 #define BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_ |
7 | 7 |
8 #include <stddef.h> // for size_t | 8 #include <stddef.h> // for size_t |
9 | 9 |
| 10 #include <type_traits> // for std::add_pointer |
| 11 |
10 #include "base/base_export.h" | 12 #include "base/base_export.h" |
11 #include "build/build_config.h" | 13 #include "build/build_config.h" |
12 | 14 |
13 namespace base { | 15 namespace base { |
14 namespace allocator { | 16 namespace allocator { |
15 | 17 |
| 18 // Callback types for alloc and free. |
| 19 using AllocHookFunc = std::add_pointer<void(const void*, size_t)>::type; |
| 20 using FreeHookFunc = std::add_pointer<void(const void*)>::type; |
| 21 |
16 // Request that the allocator release any free memory it knows about to the | 22 // Request that the allocator release any free memory it knows about to the |
17 // system. | 23 // system. |
18 BASE_EXPORT void ReleaseFreeMemory(); | 24 BASE_EXPORT void ReleaseFreeMemory(); |
19 | 25 |
20 // Get the named property's |value|. Returns true if the property is known. | 26 // Get the named property's |value|. Returns true if the property is known. |
21 // Returns false if the property is not a valid property name for the current | 27 // Returns false if the property is not a valid property name for the current |
22 // allocator implementation. | 28 // allocator implementation. |
23 // |name| or |value| cannot be NULL | 29 // |name| or |value| cannot be NULL |
24 BASE_EXPORT bool GetNumericProperty(const char* name, size_t* value); | 30 BASE_EXPORT bool GetNumericProperty(const char* name, size_t* value); |
25 | 31 |
26 BASE_EXPORT bool IsHeapProfilerRunning(); | 32 BASE_EXPORT bool IsHeapProfilerRunning(); |
27 | 33 |
| 34 // Register callbacks for alloc and free. Can only store one callback at a time |
| 35 // for each of alloc and free. Returns the previously stored hook function, or |
| 36 // nullptr if none was stored. |
| 37 BASE_EXPORT AllocHookFunc SetSingleAllocHook(AllocHookFunc func); |
| 38 BASE_EXPORT FreeHookFunc SetSingleFreeHook(FreeHookFunc func); |
| 39 |
| 40 // Returns the currently stored alloc/free callbacks that were registered by |
| 41 // calling SetSingle{Alloc,Free}Hook(). |
| 42 BASE_EXPORT AllocHookFunc GetSingleAllocHook(); |
| 43 BASE_EXPORT FreeHookFunc GetSingleFreeHook(); |
| 44 |
| 45 // Attempts to unwind the call stack from the current location where this |
| 46 // function is being called from. Must be called from a hook function registered |
| 47 // by calling SetSingle{Alloc,Free}Hook, directly or indirectly. |
| 48 // |
| 49 // Arguments: |
| 50 // stack: pointer to a pre-allocated array of void*'s. |
| 51 // max_stack_size: indicates the size of the array in |stack|. |
| 52 // skip_count: Indicates how many initial call stack levels to skip before |
| 53 // storing the caller of alloc/free. This value might not be |
| 54 // used, depending on the specific implementation. |
| 55 // |
| 56 // Returns the number of call stack frames stored in |stack|, or 0 if no call |
| 57 // stack information is available. |
| 58 BASE_EXPORT int GetCallStack(void** stack, int max_stack_size, int skip_count); |
| 59 |
28 } // namespace allocator | 60 } // namespace allocator |
29 } // namespace base | 61 } // namespace base |
30 | 62 |
31 #endif // BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_ | 63 #endif // BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_ |
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