2
* Copyright (C) 2009 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
10
* notice, this list of conditions and the following disclaimer in the
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
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.
29
#include "Identifier.h"
30
#include <wtf/SegmentedVector.h>
34
class ParserArenaDeletable;
35
class ParserArenaRefCounted;
37
class IdentifierArena {
39
ALWAYS_INLINE const Identifier& makeIdentifier(JSGlobalData*, const UChar* characters, size_t length);
40
const Identifier& makeNumericIdentifier(JSGlobalData*, double number);
42
void clear() { m_identifiers.clear(); }
43
bool isEmpty() const { return m_identifiers.isEmpty(); }
46
typedef SegmentedVector<Identifier, 64> IdentifierVector;
47
IdentifierVector m_identifiers;
50
ALWAYS_INLINE const Identifier& IdentifierArena::makeIdentifier(JSGlobalData* globalData, const UChar* characters, size_t length)
52
m_identifiers.append(Identifier(globalData, characters, length));
53
return m_identifiers.last();
56
inline const Identifier& IdentifierArena::makeNumericIdentifier(JSGlobalData* globalData, double number)
58
m_identifiers.append(Identifier(globalData, UString::from(number)));
59
return m_identifiers.last();
62
class ParserArena : Noncopyable {
67
void swap(ParserArena& otherArena)
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);
77
void* allocateFreeable(size_t 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;
90
void* allocateDeletable(size_t size)
92
ParserArenaDeletable* deletable = static_cast<ParserArenaDeletable*>(fastMalloc(size));
93
m_deletableObjects.append(deletable);
97
void derefWithArena(PassRefPtr<ParserArenaRefCounted>);
98
bool contains(ParserArenaRefCounted*) const;
99
ParserArenaRefCounted* last() const;
102
bool isEmpty() const;
105
IdentifierArena& identifierArena() { return *m_identifierArena; }
108
static const size_t freeablePoolSize = 8000;
110
static size_t alignSize(size_t size)
112
return (size + sizeof(WTF::AllocAlignmentInteger) - 1) & ~(sizeof(WTF::AllocAlignmentInteger) - 1);
115
void* freeablePool();
116
void allocateFreeablePool();
117
void deallocateObjects();
119
char* m_freeableMemory;
120
char* m_freeablePoolEnd;
122
OwnPtr<IdentifierArena> m_identifierArena;
123
Vector<void*> m_freeablePools;
124
Vector<ParserArenaDeletable*> m_deletableObjects;
125
Vector<RefPtr<ParserArenaRefCounted> > m_refCountedObjects;