84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
|
/*
|
||
|
|
* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "b2StackAllocator.h"
|
||
|
|
#include "b2Math.h"
|
||
|
|
|
||
|
|
b2StackAllocator::b2StackAllocator()
|
||
|
|
{
|
||
|
|
m_index = 0;
|
||
|
|
m_allocation = 0;
|
||
|
|
m_maxAllocation = 0;
|
||
|
|
m_entryCount = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
b2StackAllocator::~b2StackAllocator()
|
||
|
|
{
|
||
|
|
b2Assert(m_index == 0);
|
||
|
|
b2Assert(m_entryCount == 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void* b2StackAllocator::Allocate(int32 size)
|
||
|
|
{
|
||
|
|
b2Assert(m_entryCount < b2_maxStackEntries);
|
||
|
|
|
||
|
|
b2StackEntry* entry = m_entries + m_entryCount;
|
||
|
|
entry->size = size;
|
||
|
|
if (m_index + size > b2_stackSize)
|
||
|
|
{
|
||
|
|
entry->data = (char*)b2Alloc(size);
|
||
|
|
entry->usedMalloc = true;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
entry->data = m_data + m_index;
|
||
|
|
entry->usedMalloc = false;
|
||
|
|
m_index += size;
|
||
|
|
}
|
||
|
|
|
||
|
|
m_allocation += size;
|
||
|
|
m_maxAllocation = b2Max(m_maxAllocation, m_allocation);
|
||
|
|
++m_entryCount;
|
||
|
|
|
||
|
|
return entry->data;
|
||
|
|
}
|
||
|
|
|
||
|
|
void b2StackAllocator::Free(void* p)
|
||
|
|
{
|
||
|
|
b2Assert(m_entryCount > 0);
|
||
|
|
b2StackEntry* entry = m_entries + m_entryCount - 1;
|
||
|
|
b2Assert(p == entry->data);
|
||
|
|
if (entry->usedMalloc)
|
||
|
|
{
|
||
|
|
b2Free(p);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
m_index -= entry->size;
|
||
|
|
}
|
||
|
|
m_allocation -= entry->size;
|
||
|
|
--m_entryCount;
|
||
|
|
|
||
|
|
p = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int32 b2StackAllocator::GetMaxAllocation() const
|
||
|
|
{
|
||
|
|
return m_maxAllocation;
|
||
|
|
}
|