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27 #include "ParserArena.h"
30 #include <wtf/PassOwnPtr.h>
34 ParserArena::ParserArena()
36 , m_freeablePoolEnd(0)
37 , m_identifierArena(adoptPtr(new IdentifierArena))
41 inline void* ParserArena::freeablePool()
43 ASSERT(m_freeablePoolEnd);
44 return m_freeablePoolEnd - freeablePoolSize;
47 inline void ParserArena::deallocateObjects()
49 if (m_freeablePoolEnd)
50 fastFree(freeablePool());
52 size_t size = m_freeablePools.size();
53 for (size_t i = 0; i < size; ++i)
54 fastFree(m_freeablePools[i]);
56 size = m_deletableObjects.size();
57 for (size_t i = 0; i < size; ++i) {
58 ParserArenaDeletable* object = m_deletableObjects[i];
59 object->~ParserArenaDeletable();
64 ParserArena::~ParserArena()
69 bool ParserArena::contains(ParserArenaRefCounted* object) const
71 return m_refCountedObjects.find(object) != notFound;
74 ParserArenaRefCounted* ParserArena::last() const
76 return m_refCountedObjects.last().get();
79 void ParserArena::removeLast()
81 m_refCountedObjects.removeLast();
84 void ParserArena::reset()
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.
93 m_freeablePoolEnd = 0;
94 m_identifierArena->clear();
95 m_freeablePools.clear();
96 m_deletableObjects.clear();
97 m_refCountedObjects.clear();
100 void ParserArena::allocateFreeablePool()
102 if (m_freeablePoolEnd)
103 m_freeablePools.append(freeablePool());
105 char* pool = static_cast<char*>(fastMalloc(freeablePoolSize));
106 m_freeableMemory = pool;
107 m_freeablePoolEnd = pool + freeablePoolSize;
108 ASSERT(freeablePool() == pool);
111 bool ParserArena::isEmpty() const
113 return !m_freeablePoolEnd
114 && m_identifierArena->isEmpty()
115 && m_freeablePools.isEmpty()
116 && m_deletableObjects.isEmpty()
117 && m_refCountedObjects.isEmpty();
120 void ParserArena::derefWithArena(PassRefPtr<ParserArenaRefCounted> object)
122 m_refCountedObjects.append(object);