Rename DefaultAllocator to PartitionAllocator

third_party/WebKit/Source/wtf/DefaultAllocator.h

-/*
- * Copyright (C) 2013 Google 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:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * 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.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
- * OWNER 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 WTF_DefaultAllocator_h
-#define WTF_DefaultAllocator_h
-
-// This is the allocator that is used for allocations that are not on the
-// traced, garbage collected heap. It uses FastMalloc for collections,
-// but uses the partition allocator for the backing store of the collections.
-
-#include "wtf/Allocator.h"
-#include "wtf/Assertions.h"
-#include "wtf/PartitionAlloc.h"
-#include "wtf/Partitions.h"
-
-#include <string.h>
-
-namespace WTF {
-
-class DefaultAllocatorDummyVisitor;
-
-class WTF_EXPORT DefaultAllocator {
-public:
-    typedef DefaultAllocatorDummyVisitor Visitor;
-    static const bool isGarbageCollected = false;
-
-    template<typename T>
-    static size_t quantizedSize(size_t count)
-    {
-        RELEASE_ASSERT(count <= kGenericMaxDirectMapped / sizeof(T));
-        return partitionAllocActualSize(Partitions::bufferPartition(), count * sizeof(T));
-    }
-    template <typename T>
-    static T* allocateVectorBacking(size_t size)
-    {
-        return reinterpret_cast<T*>(allocateBacking(size));
-    }
-    template <typename T>
-    static T* allocateExpandedVectorBacking(size_t size)
-    {
-        return reinterpret_cast<T*>(allocateBacking(size));
-    }
-    static void freeVectorBacking(void* address);
-    static inline bool expandVectorBacking(void*, size_t)
-    {
-        return false;
-    }
-    static inline bool shrinkVectorBacking(void* address, size_t quantizedCurrentSize, size_t quantizedShrunkSize)
-    {
-        // Optimization: if we're downsizing inside the same allocator bucket,
-        // we can skip reallocation.
-        return quantizedCurrentSize == quantizedShrunkSize;
-    }
-    template <typename T>
-    static T* allocateInlineVectorBacking(size_t size) { return allocateVectorBacking<T>(size); }
-    static inline void freeInlineVectorBacking(void* address) { freeVectorBacking(address); }
-    static inline bool expandInlineVectorBacking(void*, size_t) { return false; }
-    static inline bool shrinkInlineVectorBacking(void* address, size_t quantizedCurrentSize, size_t quantizedShrunkSize) { return shrinkVectorBacking(address, quantizedCurrentSize, quantizedShrunkSize); }
-
-    template <typename T, typename HashTable>
-    static T* allocateHashTableBacking(size_t size)
-    {
-        return reinterpret_cast<T*>(allocateBacking(size));
-    }
-    template <typename T, typename HashTable>
-    static T* allocateZeroedHashTableBacking(size_t size)
-    {
-        void* result = allocateBacking(size);
-        memset(result, 0, size);
-        return reinterpret_cast<T*>(result);
-    }
-    static void freeHashTableBacking(void* address);
-
-    template <typename Return, typename Metadata>
-    static Return malloc(size_t size)
-    {
-        return reinterpret_cast<Return>(Partitions::fastMalloc(size));
-    }
-
-    static inline bool expandHashTableBacking(void*, size_t)
-    {
-        return false;
-    }
-    static void free(void* address)
-    {
-        Partitions::fastFree(address);
-    }
-    template<typename T>
-    static void* newArray(size_t bytes)
-    {
-        return malloc<void*, void>(bytes);
-    }
-    static void
-    deleteArray(void* ptr)
-    {
-        free(ptr); // Not the system free, the one from this class.
-    }
-
-    static bool isAllocationAllowed() { return true; }
-    template<typename T>
-    static bool isHeapObjectAlive(T* object)
-    {
-        ASSERT_NOT_REACHED();
-        return false;
-    }
-
-    static void markNoTracing(...)
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-    static void registerDelayedMarkNoTracing(...)
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-    static void registerWeakMembers(...)
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-    static void registerWeakTable(...)
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-#if ENABLE(ASSERT)
-    static bool weakTableRegistered(...)
-    {
-        ASSERT_NOT_REACHED();
-        return false;
-    }
-#endif
-
-    template<typename T, typename Traits>
-    static void trace(...)
-    {
-        ASSERT_NOT_REACHED();
-    }
-
-    template<typename T>
-    struct OtherType {
-        typedef T* Type;
-    };
-
-    template<typename T>
-    static T& getOther(T* other)
-    {
-        return *other;
-    }
-
-    static void enterGCForbiddenScope() { }
-    static void leaveGCForbiddenScope() { }
-
-private:
-    static void* allocateBacking(size_t);
-};
-
-// The Windows compiler seems to be very eager to instantiate things it won't
-// need, so unless we have this class we get compile errors.
-class DefaultAllocatorDummyVisitor {
-public:
-    template<typename T> inline bool isHeapObjectAlive(T obj)
-    {
-        ASSERT_NOT_REACHED();
-        return false;
-    }
-};
-
-} // namespace WTF
-
-#define WTF_USE_ALLOCATOR(ClassName, Allocator) \
-public: \
-    void* operator new(size_t size) \
-    { \
-        return Allocator::template malloc<void*, ClassName>(size); \
-    } \
-    void operator delete(void* p) { Allocator::free(p); } \
-    void* operator new[](size_t size) { return Allocator::template newArray<ClassName>(size); } \
-    void operator delete[](void* p) { Allocator::deleteArray(p); } \
-    void* operator new(size_t, NotNullTag, void* location) \
-    { \
-        ASSERT(location); \
-        return location; \
-    } \
-private: \
-typedef int __thisIsHereToForceASemicolonAfterThisMacro
-
-using WTF::DefaultAllocator;
-
-#endif // WTF_DefaultAllocator_h