// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_
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#define BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_
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#include <stddef.h> // for size_t
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#include "base/base_export.h"
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#include "build/build_config.h"
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namespace base {
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namespace allocator {
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// Callback types for alloc and free.
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using AllocHookFunc = void (*)(const void*, size_t);
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using FreeHookFunc = void (*)(const void*);
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// Request that the allocator release any free memory it knows about to the
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// system.
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BASE_EXPORT void ReleaseFreeMemory();
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// Get the named property's |value|. Returns true if the property is known.
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// Returns false if the property is not a valid property name for the current
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// allocator implementation.
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// |name| or |value| cannot be NULL
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BASE_EXPORT bool GetNumericProperty(const char* name, size_t* value);
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BASE_EXPORT bool IsHeapProfilerRunning();
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// Register callbacks for alloc and free. Can only store one callback at a time
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// for each of alloc and free.
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BASE_EXPORT void SetHooks(AllocHookFunc alloc_hook, FreeHookFunc free_hook);
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// Attempts to unwind the call stack from the current location where this
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// function is being called from. Must be called from a hook function registered
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// by calling SetSingle{Alloc,Free}Hook, directly or indirectly.
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//
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// Arguments:
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// stack: pointer to a pre-allocated array of void*'s.
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// max_stack_size: indicates the size of the array in |stack|.
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//
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// Returns the number of call stack frames stored in |stack|, or 0 if no call
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// stack information is available.
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BASE_EXPORT int GetCallStack(void** stack, int max_stack_size);
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} // namespace allocator
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} // namespace base
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#endif // BASE_ALLOCATOR_ALLOCATOR_EXTENSION_H_
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