99 lines
2.5 KiB
C++
99 lines
2.5 KiB
C++
/*
|
|
* Copyright (C) 2014-2019 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
|