Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/BumpPointerAllocator.h

Index: Source/WTF/wtf/BumpPointerAllocator.h
diff --git a/Source/WTF/wtf/BumpPointerAllocator.h b/Source/WTF/wtf/BumpPointerAllocator.h
deleted file mode 100644
index 3b2cfd974a8d9059043b7252bb2471ef938c7136..0000000000000000000000000000000000000000
--- a/Source/WTF/wtf/BumpPointerAllocator.h
+++ /dev/null
@@ -1,252 +0,0 @@
-/*
- * Copyright (C) 2010 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 BumpPointerAllocator_h
-#define BumpPointerAllocator_h
-
-#include <algorithm>
-#include <wtf/PageAllocation.h>
-#include <wtf/PageBlock.h>
-
-namespace WTF {
-
-#define MINIMUM_BUMP_POOL_SIZE 0x1000
-
-class BumpPointerPool {
-public:
-    // ensureCapacity will check whether the current pool has capacity to
-    // allocate 'size' bytes of memory  If it does not, it will attempt to
-    // allocate a new pool (which will be added to this one in a chain).
-    //
-    // If allocation fails (out of memory) this method will return null.
-    // If the return value is non-null, then callers should update any
-    // references they have to this current (possibly full) BumpPointerPool
-    // to instead point to the newly returned BumpPointerPool.
-    BumpPointerPool* ensureCapacity(size_t size)
-    {
-        void* allocationEnd = static_cast<char*>(m_current) + size;
-        ASSERT(allocationEnd > m_current); // check for overflow
-        if (allocationEnd <= static_cast<void*>(this))
-            return this;
-        return ensureCapacityCrossPool(this, size);
-    }
-
-    // alloc should only be called after calling ensureCapacity; as such
-    // alloc will never fail.
-    void* alloc(size_t size)
-    {
-        void* current = m_current;
-        void* allocationEnd = static_cast<char*>(current) + size;
-        ASSERT(allocationEnd > current); // check for overflow
-        ASSERT(allocationEnd <= static_cast<void*>(this));
-        m_current = allocationEnd;
-        return current;
-    }
-
-    // The dealloc method releases memory allocated using alloc.  Memory
-    // must be released in a LIFO fashion, e.g. if the client calls alloc
-    // four times, returning pointer A, B, C, D, then the only valid order
-    // in which these may be deallocaed is D, C, B, A.
-    //
-    // The client may optionally skip some deallocations.  In the example
-    // above, it would be valid to only explicitly dealloc C, A (D being
-    // dealloced along with C, B along with A).
-    //
-    // If pointer was not allocated from this pool (or pools) then dealloc
-    // will CRASH().  Callers should update any references they have to
-    // this current BumpPointerPool to instead point to the returned
-    // BumpPointerPool.
-    BumpPointerPool* dealloc(void* position)
-    {
-        if ((position >= m_start) && (position <= static_cast<void*>(this))) {
-            ASSERT(position <= m_current);
-            m_current = position;
-            return this;
-        }
-        return deallocCrossPool(this, position);
-    }
-
-private:
-    // Placement operator new, returns the last 'size' bytes of allocation for use as this.
-    void* operator new(size_t size, const PageAllocation& allocation)
-    {
-        ASSERT(size < allocation.size());
-        return reinterpret_cast<char*>(reinterpret_cast<intptr_t>(allocation.base()) + allocation.size()) - size;
-    }
-
-    BumpPointerPool(const PageAllocation& allocation)
-        : m_current(allocation.base())
-        , m_start(allocation.base())
-        , m_next(0)
-        , m_previous(0)
-        , m_allocation(allocation)
-    {
-    }
-
-    static BumpPointerPool* create(size_t minimumCapacity = 0)
-    {
-        // Add size of BumpPointerPool object, check for overflow.
-        minimumCapacity += sizeof(BumpPointerPool);
-        if (minimumCapacity < sizeof(BumpPointerPool))
-            return 0;
-
-        size_t poolSize = std::max(static_cast<size_t>(MINIMUM_BUMP_POOL_SIZE), WTF::pageSize());
-        while (poolSize < minimumCapacity) {
-            poolSize <<= 1;
-            // The following if check relies on MINIMUM_BUMP_POOL_SIZE being a power of 2!
-            ASSERT(!(MINIMUM_BUMP_POOL_SIZE & (MINIMUM_BUMP_POOL_SIZE - 1)));
-            if (!poolSize)
-                return 0;
-        }
-
-        PageAllocation allocation = PageAllocation::allocate(poolSize);
-        if (!!allocation)
-            return new (allocation) BumpPointerPool(allocation);
-        return 0;
-    }
-
-    void shrink()
-    {
-        ASSERT(!m_previous);
-        m_current = m_start;
-        while (m_next) {
-            BumpPointerPool* nextNext = m_next->m_next;
-            m_next->destroy();
-            m_next = nextNext;
-        }
-    }
-
-    void destroy()
-    {
-        m_allocation.deallocate();
-    }
-
-    static BumpPointerPool* ensureCapacityCrossPool(BumpPointerPool* previousPool, size_t size)
-    {
-        // The pool passed should not have capacity, so we'll start with the next one.
-        ASSERT(previousPool);
-        ASSERT((static_cast<char*>(previousPool->m_current) + size) > previousPool->m_current); // check for overflow
-        ASSERT((static_cast<char*>(previousPool->m_current) + size) > static_cast<void*>(previousPool));
-        BumpPointerPool* pool = previousPool->m_next;
-
-        while (true) {
-            if (!pool) {
-                // We've run to the end; allocate a new pool.
-                pool = BumpPointerPool::create(size);
-                previousPool->m_next = pool;
-                pool->m_previous = previousPool;
-                return pool;
-            }
-
-            // 
-            void* current = pool->m_current;
-            void* allocationEnd = static_cast<char*>(current) + size;
-            ASSERT(allocationEnd > current); // check for overflow
-            if (allocationEnd <= static_cast<void*>(pool))
-                return pool;
-        }
-    }
-
-    static BumpPointerPool* deallocCrossPool(BumpPointerPool* pool, void* position)
-    {
-        // Should only be called if position is not in the current pool.
-        ASSERT((position < pool->m_start) || (position > static_cast<void*>(pool)));
-
-        while (true) {
-            // Unwind the current pool to the start, move back in the chain to the previous pool.
-            pool->m_current = pool->m_start;
-            pool = pool->m_previous;
-
-            // position was nowhere in the chain!
-            if (!pool)
-                CRASH();
-
-            if ((position >= pool->m_start) && (position <= static_cast<void*>(pool))) {
-                ASSERT(position <= pool->m_current);
-                pool->m_current = position;
-                return pool;
-            }
-        }
-    }
-
-    void* m_current;
-    void* m_start;
-    BumpPointerPool* m_next;
-    BumpPointerPool* m_previous;
-    PageAllocation m_allocation;
-
-    friend class BumpPointerAllocator;
-};
-
-// A BumpPointerAllocator manages a set of BumpPointerPool objects, which
-// can be used for LIFO (stack like) allocation.
-//
-// To begin allocating using this class call startAllocator().  The result
-// of this method will be null if the initial pool allocation fails, or a
-// pointer to a BumpPointerPool object that can be used to perform
-// allocations.  Whilst running no memory will be released until
-// stopAllocator() is called.  At this point all allocations made through
-// this allocator will be reaped, and underlying memory may be freed.
-//
-// (In practice we will still hold on to the initial pool to allow allocation
-// to be quickly restared, but aditional pools will be freed).
-//
-// This allocator is non-renetrant, it is encumbant on the clients to ensure
-// startAllocator() is not called again until stopAllocator() has been called.
-class BumpPointerAllocator {
-public:
-    BumpPointerAllocator()
-        : m_head(0)
-    {
-    }
-
-    ~BumpPointerAllocator()
-    {
-        if (m_head)
-            m_head->destroy();
-    }
-
-    BumpPointerPool* startAllocator()
-    {
-        if (!m_head)
-            m_head = BumpPointerPool::create();
-        return m_head;
-    }
-
-    void stopAllocator()
-    {
-        if (m_head)
-            m_head->shrink();
-    }
-
-private:
-    BumpPointerPool* m_head;
-};
-
-}
-
-using WTF::BumpPointerAllocator;
-
-#endif // BumpPointerAllocator_h