#ifndef SmallStrings_h
#define SmallStrings_h
#include "WriteBarrier.h"
#include <wtf/FixedArray.h>
#include <wtf/Noncopyable.h>
#include <wtf/OwnPtr.h>
#define JSC_COMMON_STRINGS_EACH_NAME(macro) \
macro(boolean) \
macro(false) \
macro(function) \
macro(number) \
macro(null) \
macro(object) \
macro(undefined) \
macro(string) \
macro(true)
namespace WTF {
class StringImpl;
}
namespace JSC {
class HeapRootVisitor;
class VM;
class JSString;
class SmallStringsStorage;
class SlotVisitor;
static const unsigned maxSingleCharacterString = 0xFF;
class SmallStrings {
WTF_MAKE_NONCOPYABLE(SmallStrings);
public:
SmallStrings();
~SmallStrings();
JSString* emptyString()
{
return m_emptyString;
}
JSString* singleCharacterString(VM* vm, unsigned char character)
{
if (!m_singleCharacterStrings[character])
createSingleCharacterString(vm, character);
return m_singleCharacterStrings[character];
}
JS_EXPORT_PRIVATE WTF::StringImpl* singleCharacterStringRep(unsigned char character);
void finalizeSmallStrings();
JSString** singleCharacterStrings() { return &m_singleCharacterStrings[0]; }
void initializeCommonStrings(VM&);
void visitStrongReferences(SlotVisitor&);
#define JSC_COMMON_STRINGS_ACCESSOR_DEFINITION(name) \
JSString* name##String() const \
{ \
return m_##name; \
}
JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ACCESSOR_DEFINITION)
#undef JSC_COMMON_STRINGS_ACCESSOR_DEFINITION
private:
static const unsigned singleCharacterStringCount = maxSingleCharacterString + 1;
JS_EXPORT_PRIVATE void createEmptyString(VM*);
JS_EXPORT_PRIVATE void createSingleCharacterString(VM*, unsigned char);
void initialize(VM* vm, JSString*& string, const char* value) const;
JSString* m_emptyString;
#define JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION(name) JSString* m_##name;
JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION)
#undef JSC_COMMON_STRINGS_ATTRIBUTE_DECLARATION
JSString* m_singleCharacterStrings[singleCharacterStringCount];
OwnPtr<SmallStringsStorage> m_storage;
};
}
#endif // SmallStrings_h