#ifndef ParserArena_h
#define ParserArena_h
#include "Identifier.h"
#include <wtf/SegmentedVector.h>
namespace JSC {
class ParserArenaDeletable;
class ParserArenaRefCounted;
class IdentifierArena {
WTF_MAKE_FAST_ALLOCATED;
public:
IdentifierArena()
{
clear();
}
ALWAYS_INLINE const Identifier& makeIdentifier(JSGlobalData*, const UChar* characters, size_t length);
const Identifier& makeNumericIdentifier(JSGlobalData*, double number);
void clear()
{
m_identifiers.clear();
for (unsigned i = 0; i < 128; i++)
m_shortIdentifiers[i] = 0;
}
bool isEmpty() const { return m_identifiers.isEmpty(); }
private:
static const int MaximumCachableCharacter = 128;
typedef SegmentedVector<Identifier, 64> IdentifierVector;
IdentifierVector m_identifiers;
FixedArray<Identifier*, MaximumCachableCharacter> m_shortIdentifiers;
};
ALWAYS_INLINE const Identifier& IdentifierArena::makeIdentifier(JSGlobalData* globalData, const UChar* characters, size_t length)
{
if (length == 1 && characters[0] < MaximumCachableCharacter) {
if (Identifier* ident = m_shortIdentifiers[characters[0]])
return *ident;
m_identifiers.append(Identifier(globalData, characters, length));
m_shortIdentifiers[characters[0]] = &m_identifiers.last();
return m_identifiers.last();
}
m_identifiers.append(Identifier(globalData, characters, length));
return m_identifiers.last();
}
inline const Identifier& IdentifierArena::makeNumericIdentifier(JSGlobalData* globalData, double number)
{
m_identifiers.append(Identifier(globalData, UString::number(number)));
return m_identifiers.last();
}
class ParserArena {
WTF_MAKE_NONCOPYABLE(ParserArena);
public:
ParserArena();
~ParserArena();
void swap(ParserArena& otherArena)
{
std::swap(m_freeableMemory, otherArena.m_freeableMemory);
std::swap(m_freeablePoolEnd, otherArena.m_freeablePoolEnd);
m_identifierArena.swap(otherArena.m_identifierArena);
m_freeablePools.swap(otherArena.m_freeablePools);
m_deletableObjects.swap(otherArena.m_deletableObjects);
m_refCountedObjects.swap(otherArena.m_refCountedObjects);
}
void* allocateFreeable(size_t size)
{
ASSERT(size);
ASSERT(size <= freeablePoolSize);
size_t alignedSize = alignSize(size);
ASSERT(alignedSize <= freeablePoolSize);
if (UNLIKELY(static_cast<size_t>(m_freeablePoolEnd - m_freeableMemory) < alignedSize))
allocateFreeablePool();
void* block = m_freeableMemory;
m_freeableMemory += alignedSize;
return block;
}
void* allocateDeletable(size_t size)
{
ParserArenaDeletable* deletable = static_cast<ParserArenaDeletable*>(fastMalloc(size));
m_deletableObjects.append(deletable);
return deletable;
}
void derefWithArena(PassRefPtr<ParserArenaRefCounted>);
bool contains(ParserArenaRefCounted*) const;
ParserArenaRefCounted* last() const;
void removeLast();
bool isEmpty() const;
void reset();
IdentifierArena& identifierArena() { return *m_identifierArena; }
private:
static const size_t freeablePoolSize = 8000;
static size_t alignSize(size_t size)
{
return (size + sizeof(WTF::AllocAlignmentInteger) - 1) & ~(sizeof(WTF::AllocAlignmentInteger) - 1);
}
void* freeablePool();
void allocateFreeablePool();
void deallocateObjects();
char* m_freeableMemory;
char* m_freeablePoolEnd;
OwnPtr<IdentifierArena> m_identifierArena;
Vector<void*> m_freeablePools;
Vector<ParserArenaDeletable*> m_deletableObjects;
Vector<RefPtr<ParserArenaRefCounted> > m_refCountedObjects;
};
}
#endif