SymbolConstructor.cpp [plain text]
#include "config.h"
#include "SymbolConstructor.h"
#include "Error.h"
#include "JSCInlines.h"
#include "JSGlobalObject.h"
#include "Symbol.h"
#include "SymbolPrototype.h"
#include <wtf/text/SymbolRegistry.h>
namespace JSC {
static EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState*);
static EncodedJSValue JSC_HOST_CALL symbolConstructorKeyFor(ExecState*);
}
#include "SymbolConstructor.lut.h"
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(SymbolConstructor);
const ClassInfo SymbolConstructor::s_info = { "Function", &Base::s_info, &symbolConstructorTable, nullptr, CREATE_METHOD_TABLE(SymbolConstructor) };
static EncodedJSValue JSC_HOST_CALL callSymbol(ExecState*);
SymbolConstructor::SymbolConstructor(VM& vm, Structure* structure)
: InternalFunction(vm, structure, callSymbol, nullptr)
{
}
#define INITIALIZE_WELL_KNOWN_SYMBOLS(name) \
putDirectWithoutTransition(vm, Identifier::fromString(&vm, #name), Symbol::create(vm, static_cast<SymbolImpl&>(*vm.propertyNames->name##Symbol.impl())), PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
void SymbolConstructor::finishCreation(VM& vm, SymbolPrototype* prototype)
{
Base::finishCreation(vm, prototype->classInfo(vm)->className);
putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(0), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
JSC_COMMON_PRIVATE_IDENTIFIERS_EACH_WELL_KNOWN_SYMBOL(INITIALIZE_WELL_KNOWN_SYMBOLS)
}
static EncodedJSValue JSC_HOST_CALL callSymbol(ExecState* exec)
{
JSValue description = exec->argument(0);
if (description.isUndefined())
return JSValue::encode(Symbol::create(exec->vm()));
return JSValue::encode(Symbol::create(exec, description.toString(exec)));
}
EncodedJSValue JSC_HOST_CALL symbolConstructorFor(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSString* stringKey = exec->argument(0).toString(exec);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
String string = stringKey->value(exec);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
return JSValue::encode(Symbol::create(exec->vm(), exec->vm().symbolRegistry().symbolForKey(string)));
}
const ASCIILiteral SymbolKeyForTypeError { "Symbol.keyFor requires that the first argument be a symbol"_s };
EncodedJSValue JSC_HOST_CALL symbolConstructorKeyFor(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue symbolValue = exec->argument(0);
if (!symbolValue.isSymbol())
return JSValue::encode(throwTypeError(exec, scope, SymbolKeyForTypeError));
SymbolImpl& uid = asSymbol(symbolValue)->privateName().uid();
if (!uid.symbolRegistry())
return JSValue::encode(jsUndefined());
ASSERT(uid.symbolRegistry() == &vm.symbolRegistry());
return JSValue::encode(jsString(exec, &uid));
}
}