OpaqueJSString.cpp [plain text]
#include "config.h"
#include "OpaqueJSString.h"
#include "CallFrame.h"
#include "Identifier.h"
#include "JSGlobalObject.h"
#include <wtf/text/StringView.h>
using namespace JSC;
PassRefPtr<OpaqueJSString> OpaqueJSString::create(const String& string)
{
if (string.isNull())
return nullptr;
return adoptRef(new OpaqueJSString(string));
}
OpaqueJSString::~OpaqueJSString()
{
UChar* characters = m_characters;
if (!characters)
return;
if (!m_string.is8Bit() && m_string.characters16() == characters)
return;
fastFree(characters);
}
String OpaqueJSString::string() const
{
if (!this)
return String();
return m_string.isolatedCopy();
}
Identifier OpaqueJSString::identifier(VM* vm) const
{
if (!this || m_string.isNull())
return Identifier();
if (m_string.isEmpty())
return Identifier(Identifier::EmptyIdentifier);
if (m_string.is8Bit())
return Identifier(vm, m_string.characters8(), m_string.length());
return Identifier(vm, m_string.characters16(), m_string.length());
}
const UChar* OpaqueJSString::characters()
{
if (!this)
return nullptr;
UChar* characters = m_characters;
if (characters)
return characters;
if (m_string.isNull())
return nullptr;
unsigned length = m_string.length();
UChar* newCharacters = static_cast<UChar*>(fastMalloc(length * sizeof(UChar)));
StringView(m_string).getCharactersWithUpconvert(newCharacters);
if (!m_characters.compare_exchange_strong(characters, newCharacters)) {
fastFree(newCharacters);
return characters;
}
return newCharacters;
}
bool OpaqueJSString::equal(const OpaqueJSString* a, const OpaqueJSString* b)
{
if (a == b)
return true;
if (!a || !b)
return false;
return a->m_string == b->m_string;
}