b2TrackedBlock.h

/*
* Copyright (c) 2014 Google, Inc.
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#ifndef B2_TRACKED_BLOCK_H
#define B2_TRACKED_BLOCK_H

#include <Box2D/Common/b2IntrusiveList.h>
#include <Box2D/Common/b2Settings.h>

const int32 b2_mallocAlignment = 32;

class b2TrackedBlock : public b2TypedIntrusiveListNode<b2TrackedBlock>
{
private:
    // Initialize this block with a reference to "this".
    b2TrackedBlock();
    // Remove the block from the list.
    ~b2TrackedBlock() { }

public:
    void* GetMemory() const;

private:
    // Padding required to align the pointer to user memory in the block
    // to b2_mallocAlignment.
    uint8 m_padding[b2_mallocAlignment + sizeof(b2TrackedBlock**)];

public:
    static void* Allocate(uint32 size);

    static b2TrackedBlock* GetFromMemory(void *memory);

    static void Free(void *memory);

    static void Free(b2TrackedBlock *block);
};

class b2TrackedBlockAllocator
{
public:
    b2TrackedBlockAllocator() {}
    ~b2TrackedBlockAllocator()
    {
        FreeAll();
    }

    void* Allocate(uint32 size);

    void Free(void *memory);

    void FreeAll();

    // Get the list of allocated blocks.
    const b2TypedIntrusiveListNode<b2TrackedBlock>& GetList() const
    {
        return m_blocks;
    }

private:
    b2TypedIntrusiveListNode<b2TrackedBlock> m_blocks;
};

#endif  // B2_TRACKED_BLOCK_H