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/*
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef BumpAllocator_h
#define BumpAllocator_h
#include "BAssert.h"
#include "BumpRange.h"
#include "ObjectType.h"
namespace bmalloc {
// Helper object for allocating small objects.
class BumpAllocator {
public:
BumpAllocator();
void init(size_t);
size_t size() { return m_size; }
bool isNull() { return !m_ptr; }
void clear();
bool canAllocate() { return !!m_remaining; }
void* allocate();
void refill(const BumpRange&);
private:
char* m_ptr;
unsigned m_size;
unsigned m_remaining;
};
inline BumpAllocator::BumpAllocator()
: m_ptr()
, m_size()
, m_remaining()
{
}
inline void BumpAllocator::init(size_t size)
{
m_ptr = nullptr;
m_size = size;
m_remaining = 0;
}
inline void* BumpAllocator::allocate()
{
BASSERT(m_remaining);
--m_remaining;
char* result = m_ptr;
m_ptr += m_size;
return result;
}
inline void BumpAllocator::refill(const BumpRange& bumpRange)
{
BASSERT(!canAllocate());
m_ptr = bumpRange.begin;
m_remaining = bumpRange.objectCount;
BASSERT(canAllocate());
}
inline void BumpAllocator::clear()
{
m_ptr = nullptr;
m_remaining = 0;
}
} // namespace bmalloc
#endif // BumpAllocator_h