2 * Copyright (C) 2014 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
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11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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26 #ifndef BumpAllocator_h
27 #define BumpAllocator_h
30 #include "ObjectType.h"
34 // Helper object for allocating small and medium objects.
39 template<typename Line> void init(size_t);
41 bool isNull() { return !m_ptr; }
42 template<typename Line> Line* line();
44 bool canAllocate() { return !!m_remaining; }
47 template<typename Line> void refill(Line*);
54 unsigned short m_size;
55 unsigned char m_remaining;
56 unsigned char m_maxObjectCount;
59 inline BumpAllocator::BumpAllocator()
67 template<typename Line>
68 inline void BumpAllocator::init(size_t size)
70 BASSERT(size >= Line::minimumObjectSize);
75 m_maxObjectCount = Line::lineSize / size;
78 template<typename Line>
79 inline Line* BumpAllocator::line()
81 return Line::get(canAllocate() ? m_ptr : m_ptr - 1);
84 inline void BumpAllocator::validate(void* ptr)
87 if (m_size <= smallMax) {
88 BASSERT(isSmall(ptr));
92 BASSERT(m_size <= mediumMax);
93 BASSERT(isMedium(ptr));
96 inline void* BumpAllocator::allocate()
101 char* result = m_ptr;
107 template<typename Line>
108 inline void BumpAllocator::refill(Line* line)
110 BASSERT(!canAllocate());
111 line->concurrentRef(m_maxObjectCount);
112 m_ptr = line->begin();
113 m_remaining = m_maxObjectCount;
116 inline void BumpAllocator::clear()
122 } // namespace bmalloc
124 #endif // BumpAllocator_h