mirror of https://github.com/axmolengine/axmol.git
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
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/*
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* Copyright (c) 2014 Google, Inc.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef B2_TRACKED_BLOCK_H
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#define B2_TRACKED_BLOCK_H
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#include "b2_intrusive_list.h"
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#include "b2_settings.h"
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/// Alignment (in bytes) of user memory associated with b2TrackedBlock.
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const int32 b2_mallocAlignment = 32;
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/// Allocated block of memory that can be tracked in a b2IntrusiveList.
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class b2TrackedBlock : public b2TypedIntrusiveListNode<b2TrackedBlock>
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{
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private:
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// Initialize this block with a reference to "this".
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b2TrackedBlock();
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// Remove the block from the list.
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~b2TrackedBlock() { }
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public:
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/// Get the allocated memory associated with this block.
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void* GetMemory() const;
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private:
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// Padding required to align the pointer to user memory in the block
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// to b2_mallocAlignment.
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uint8 m_padding[b2_mallocAlignment + sizeof(b2TrackedBlock**)];
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public:
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/// Allocate a b2TrackedBlock returning a pointer to memory of size
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/// bytes that can be used by the caller.
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static void* Allocate(uint32 size);
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/// Get a b2TrackedBlock from a pointer to memory returned by
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/// b2TrackedBlock::Allocate().
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static b2TrackedBlock* GetFromMemory(void *memory);
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/// Free a block of memory returned by b2TrackedBlock::Allocate()
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static void Free(void *memory);
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/// Free a b2TrackedBlock.
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static void Free(b2TrackedBlock *block);
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};
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/// Allocator of blocks which are tracked in a list.
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class b2TrackedBlockAllocator
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{
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public:
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/// Initialize.
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b2TrackedBlockAllocator() {}
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/// Free all allocated blocks.
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~b2TrackedBlockAllocator()
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{
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FreeAll();
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}
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/// Allocate a block of size bytes using b2TrackedBlock::Allocate().
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void* Allocate(uint32 size);
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/// Free a block returned by Allocate().
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void Free(void *memory);
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/// Free all allocated blocks.
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void FreeAll();
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// Get the list of allocated blocks.
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const b2TypedIntrusiveListNode<b2TrackedBlock>& GetList() const
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{
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return m_blocks;
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}
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private:
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b2TypedIntrusiveListNode<b2TrackedBlock> m_blocks;
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};
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#endif // B2_TRACKED_BLOCK_H
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