1 /* 2 * Copyright (C) 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 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 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 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 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef ParserArena_h 27 #define ParserArena_h 28 29 #include "Identifier.h" 30 #include <wtf/SegmentedVector.h> 31 32 namespace JSC { 33 34 class ParserArenaDeletable; 35 class ParserArenaRefCounted; 36 37 class IdentifierArena : public FastAllocBase { 38 public: 39 ALWAYS_INLINE const Identifier& makeIdentifier(JSGlobalData*, const UChar* characters, size_t length); 40 const Identifier& makeNumericIdentifier(JSGlobalData*, double number); 41 clear()42 void clear() { m_identifiers.clear(); } isEmpty()43 bool isEmpty() const { return m_identifiers.isEmpty(); } 44 45 private: 46 typedef SegmentedVector<Identifier, 64> IdentifierVector; 47 IdentifierVector m_identifiers; 48 }; 49 makeIdentifier(JSGlobalData * globalData,const UChar * characters,size_t length)50 ALWAYS_INLINE const Identifier& IdentifierArena::makeIdentifier(JSGlobalData* globalData, const UChar* characters, size_t length) 51 { 52 m_identifiers.append(Identifier(globalData, characters, length)); 53 return m_identifiers.last(); 54 } 55 makeNumericIdentifier(JSGlobalData * globalData,double number)56 inline const Identifier& IdentifierArena::makeNumericIdentifier(JSGlobalData* globalData, double number) 57 { 58 m_identifiers.append(Identifier(globalData, UString::from(number))); 59 return m_identifiers.last(); 60 } 61 62 class ParserArena : Noncopyable { 63 public: 64 ParserArena(); 65 ~ParserArena(); 66 swap(ParserArena & otherArena)67 void swap(ParserArena& otherArena) 68 { 69 std::swap(m_freeableMemory, otherArena.m_freeableMemory); 70 std::swap(m_freeablePoolEnd, otherArena.m_freeablePoolEnd); 71 m_identifierArena.swap(otherArena.m_identifierArena); 72 m_freeablePools.swap(otherArena.m_freeablePools); 73 m_deletableObjects.swap(otherArena.m_deletableObjects); 74 m_refCountedObjects.swap(otherArena.m_refCountedObjects); 75 } 76 allocateFreeable(size_t size)77 void* allocateFreeable(size_t size) 78 { 79 ASSERT(size); 80 ASSERT(size <= freeablePoolSize); 81 size_t alignedSize = alignSize(size); 82 ASSERT(alignedSize <= freeablePoolSize); 83 if (UNLIKELY(static_cast<size_t>(m_freeablePoolEnd - m_freeableMemory) < alignedSize)) 84 allocateFreeablePool(); 85 void* block = m_freeableMemory; 86 m_freeableMemory += alignedSize; 87 return block; 88 } 89 allocateDeletable(size_t size)90 void* allocateDeletable(size_t size) 91 { 92 ParserArenaDeletable* deletable = static_cast<ParserArenaDeletable*>(fastMalloc(size)); 93 m_deletableObjects.append(deletable); 94 return deletable; 95 } 96 97 void derefWithArena(PassRefPtr<ParserArenaRefCounted>); 98 bool contains(ParserArenaRefCounted*) const; 99 ParserArenaRefCounted* last() const; 100 void removeLast(); 101 102 bool isEmpty() const; 103 void reset(); 104 identifierArena()105 IdentifierArena& identifierArena() { return *m_identifierArena; } 106 107 private: 108 static const size_t freeablePoolSize = 8000; 109 alignSize(size_t size)110 static size_t alignSize(size_t size) 111 { 112 return (size + sizeof(WTF::AllocAlignmentInteger) - 1) & ~(sizeof(WTF::AllocAlignmentInteger) - 1); 113 } 114 115 void* freeablePool(); 116 void allocateFreeablePool(); 117 void deallocateObjects(); 118 119 char* m_freeableMemory; 120 char* m_freeablePoolEnd; 121 122 OwnPtr<IdentifierArena> m_identifierArena; 123 Vector<void*> m_freeablePools; 124 Vector<ParserArenaDeletable*> m_deletableObjects; 125 Vector<RefPtr<ParserArenaRefCounted> > m_refCountedObjects; 126 }; 127 128 } 129 130 #endif 131