JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / wtf / BlockStack.h

diff --git a/wtf/BlockStack.h b/wtf/BlockStack.h
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--- a/wtf/BlockStack.h
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-/*
- * Copyright (C) 2011 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. AND ITS CONTRIBUTORS ``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 ITS 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 BlockStack_h
-#define BlockStack_h
-
-#include <wtf/Assertions.h>
-#include <wtf/Vector.h>
-
-namespace WTF {
-
-template <typename T> class BlockStack {
-public:
-    static const size_t blockSize = 4096;
-    static const size_t blockLength = blockSize / sizeof(T);
-
-    BlockStack();
-    ~BlockStack();
-
-    T* grow();
-    void shrink(T*);
-
-    const Vector<T*>& blocks();
-
-private:
-    Vector<T*> m_blocks;
-    T* m_spareBlock; // Used to avoid thrash at block boundaries.
-};
-
-template <typename T> BlockStack<T>::BlockStack()
-    : m_spareBlock(0)
-{
-}
-
-template <typename T> BlockStack<T>::~BlockStack()
-{
-    if (m_spareBlock)
-        free(m_spareBlock);
-    for (size_t i = 0; i < m_blocks.size(); ++i)
-        free(m_blocks[i]);
-}
-
-template <typename T> inline const Vector<T*>& BlockStack<T>::blocks()
-{
-    return m_blocks;
-}
-
-template <typename T> T* BlockStack<T>::grow()
-{
-    T* block = m_spareBlock ? m_spareBlock : static_cast<T*>(malloc(blockSize));
-    m_spareBlock = 0;
-
-    m_blocks.append(block);
-    return block;
-}
-
-template <typename T> void BlockStack<T>::shrink(T* newEnd)
-{
-    ASSERT(newEnd != m_blocks.last() + blockLength);
-    m_spareBlock = m_blocks.last();
-    m_blocks.removeLast();
-
-    while (m_blocks.last() + blockLength != newEnd) {
-        free(m_blocks.last());
-        m_blocks.removeLast();
-    }
-}
-
-}
-
-using WTF::BlockStack;
-
-#endif