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#include "config.h"
27#include "Parser.h"
28#include "ParserArena.h"
29
30#include "Nodes.h"
31
32namespace JSC {
33
34ParserArena::ParserArena()
35 : m_freeableMemory(0)
36 , m_freeablePoolEnd(0)
37 , m_identifierArena(new IdentifierArena)
38{
39}
40
41inline void* ParserArena::freeablePool()
42{
43 ASSERT(m_freeablePoolEnd);
44 return m_freeablePoolEnd - freeablePoolSize;
45}
46
47inline void ParserArena::deallocateObjects()
48{
49 if (m_freeablePoolEnd)
50 fastFree(freeablePool());
51
52 size_t size = m_freeablePools.size();
53 for (size_t i = 0; i < size; ++i)
54 fastFree(m_freeablePools[i]);
55
56 size = m_deletableObjects.size();
57 for (size_t i = 0; i < size; ++i) {
58 ParserArenaDeletable* object = m_deletableObjects[i];
59 object->~ParserArenaDeletable();
60 fastFree(object);
61 }
62}
63
64ParserArena::~ParserArena()
65{
66 deallocateObjects();
67}
68
69bool ParserArena::contains(ParserArenaRefCounted* object) const
70{
71 return m_refCountedObjects.find(value: object) != notFound;
72}
73
74ParserArenaRefCounted* ParserArena::last() const
75{
76 return m_refCountedObjects.last().get();
77}
78
79void ParserArena::removeLast()
80{
81 m_refCountedObjects.removeLast();
82}
83
84void ParserArena::reset()
85{
86 // Since this code path is used only when parsing fails, it's not bothering to reuse
87 // any of the memory the arena allocated. We could improve that later if we want to
88 // efficiently reuse the same arena.
89
90 deallocateObjects();
91
92 m_freeableMemory = 0;
93 m_freeablePoolEnd = 0;
94 m_identifierArena->clear();
95 m_freeablePools.clear();
96 m_deletableObjects.clear();
97 m_refCountedObjects.clear();
98}
99
100void ParserArena::allocateFreeablePool()
101{
102 if (m_freeablePoolEnd)
103 m_freeablePools.append(val: freeablePool());
104
105 char* pool = static_cast<char*>(fastMalloc(freeablePoolSize));
106 m_freeableMemory = pool;
107 m_freeablePoolEnd = pool + freeablePoolSize;
108 ASSERT(freeablePool() == pool);
109}
110
111bool ParserArena::isEmpty() const
112{
113 return !m_freeablePoolEnd
114 && m_identifierArena->isEmpty()
115 && m_freeablePools.isEmpty()
116 && m_deletableObjects.isEmpty()
117 && m_refCountedObjects.isEmpty();
118}
119
120void ParserArena::derefWithArena(PassRefPtr<ParserArenaRefCounted> object)
121{
122 m_refCountedObjects.append(val: object);
123}
124
125void* ParserArenaFreeable::operator new(size_t size, JSGlobalData* globalData)
126{
127 return globalData->parser->arena().allocateFreeable(size);
128}
129
130void* ParserArenaDeletable::operator new(size_t size, JSGlobalData* globalData)
131{
132 return globalData->parser->arena().allocateDeletable(size);
133}
134
135}
136

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/parser/ParserArena.cpp