mirror of
https://github.com/Samsung/escargot.git
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168 lines
12 KiB
C++
168 lines
12 KiB
C++
/*
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* Copyright (c) 2018-present Samsung Electronics Co., Ltd
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#include "Escargot.h"
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#include "runtime/GlobalObject.h"
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#include "runtime/Context.h"
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#include "runtime/VMInstance.h"
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#include "runtime/SymbolObject.h"
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#include "runtime/NativeFunctionObject.h"
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#include "runtime/ToStringRecursionPreventer.h"
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namespace Escargot {
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static Value builtinSymbolConstructor(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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// If NewTarget is not undefined, throw a TypeError exception.
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if (newTarget.hasValue()) {
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ErrorObject::throwBuiltinError(state, ErrorCode::TypeError, "illegal constructor Symbol");
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}
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// If description is undefined, let descString be undefined.
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// (NOTE) we represent `undefined` as nullptr here
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String* descStr = nullptr;
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if (argc > 0 && !argv[0].isUndefined()) {
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// Else, let descString be ? ToString(description).
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descStr = argv[0].toString(state);
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}
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// Return a new Symbol whose [[Description]] is descString.
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return new Symbol(descStr);
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}
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#define RESOLVE_THIS_BINDING_TO_SYMBOL(NAME, OBJ, BUILT_IN_METHOD) \
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Symbol* NAME = nullptr; \
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if (thisValue.isObject()) { \
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if (!thisValue.asObject()->isSymbolObject()) { \
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ErrorObject::throwBuiltinError(state, ErrorCode::TypeError, state.context()->staticStrings().OBJ.string(), true, state.context()->staticStrings().BUILT_IN_METHOD.string(), ErrorObject::Messages::GlobalObject_CalledOnIncompatibleReceiver); \
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} \
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NAME = thisValue.asObject()->asSymbolObject()->primitiveValue(); \
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} else if (thisValue.isSymbol()) { \
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NAME = thisValue.asSymbol(); \
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} else { \
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ErrorObject::throwBuiltinError(state, ErrorCode::TypeError, state.context()->staticStrings().OBJ.string(), true, state.context()->staticStrings().BUILT_IN_METHOD.string(), ErrorObject::Messages::GlobalObject_CalledOnIncompatibleReceiver); \
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}
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static Value builtinSymbolToString(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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RESOLVE_THIS_BINDING_TO_SYMBOL(S, Symbol, toString);
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return S->symbolDescriptiveString();
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}
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static Value builtinSymbolValueOf(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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RESOLVE_THIS_BINDING_TO_SYMBOL(S, Symbol, valueOf);
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return Value(S);
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}
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static Value builtinSymbolToPrimitive(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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RESOLVE_THIS_BINDING_TO_SYMBOL(S, Symbol, toPrimitive);
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return Value(S);
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}
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static Value builtinSymbolFor(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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// Let stringKey be ? ToString(key).
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String* stringKey = argv[0].toString(state);
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return Symbol::fromGlobalSymbolRegistry(state.context()->vmInstance(), stringKey);
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}
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static Value builtinSymbolKeyFor(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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// If Type(sym) is not Symbol, throw a TypeError exception.
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if (!argv[0].isSymbol()) {
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ErrorObject::throwBuiltinError(state, ErrorCode::TypeError, ErrorObject::Messages::GlobalObject_IllegalFirstArgument);
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}
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Symbol* sym = argv[0].asSymbol();
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return Symbol::keyForSymbol(state.context()->vmInstance(), sym);
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}
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static Value builtinSymbolDescriptionGetter(ExecutionState& state, Value thisValue, size_t argc, Value* argv, Optional<Object*> newTarget)
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{
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if (thisValue.isSymbol()) {
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return thisValue.asSymbol()->descriptionValue();
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} else if (thisValue.isObject() && thisValue.asObject()->isSymbolObject()) {
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return thisValue.asObject()->asSymbolObject()->primitiveValue()->descriptionValue();
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} else {
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ErrorObject::throwBuiltinError(state, ErrorCode::TypeError, "getter called on non-Symbol object");
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}
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return Value();
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}
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void GlobalObject::initializeSymbol(ExecutionState& state)
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{
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ObjectPropertyNativeGetterSetterData* nativeData = new ObjectPropertyNativeGetterSetterData(true, false, true, [](ExecutionState& state, Object* self, const Value& receiver, const EncodedValue& privateDataFromObjectPrivateArea) -> Value {
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ASSERT(self->isGlobalObject());
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return self->asGlobalObject()->symbol(); }, nullptr);
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defineNativeDataAccessorProperty(state, ObjectPropertyName(state.context()->staticStrings().Symbol), nativeData, Value(Value::EmptyValue));
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}
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void GlobalObject::installSymbol(ExecutionState& state)
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{
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m_symbol = new NativeFunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().Symbol, builtinSymbolConstructor, 0), NativeFunctionObject::__ForBuiltinConstructor__);
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m_symbol->setGlobalIntrinsicObject(state);
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m_symbol->directDefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().stringFor),
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ObjectPropertyDescriptor(new NativeFunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().stringFor, builtinSymbolFor, 1, NativeFunctionInfo::Strict)),
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(ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::WritablePresent | ObjectPropertyDescriptor::ConfigurablePresent)));
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m_symbol->directDefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().keyFor),
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ObjectPropertyDescriptor(new NativeFunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().keyFor, builtinSymbolKeyFor, 1, NativeFunctionInfo::Strict)),
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(ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::WritablePresent | ObjectPropertyDescriptor::ConfigurablePresent)));
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m_symbolPrototype = new PrototypeObject(state);
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m_symbolPrototype->setGlobalIntrinsicObject(state, true);
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m_symbolPrototype->directDefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().constructor), ObjectPropertyDescriptor(m_symbol, (ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::WritablePresent | ObjectPropertyDescriptor::ConfigurablePresent)));
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m_symbolPrototype->directDefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().toString),
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ObjectPropertyDescriptor(new NativeFunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().toString, builtinSymbolToString, 0, NativeFunctionInfo::Strict)),
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(ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::WritablePresent | ObjectPropertyDescriptor::ConfigurablePresent)));
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m_symbolPrototype->directDefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().valueOf),
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ObjectPropertyDescriptor(new NativeFunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().valueOf, builtinSymbolValueOf, 0, NativeFunctionInfo::Strict)),
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(ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::WritablePresent | ObjectPropertyDescriptor::ConfigurablePresent)));
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m_symbolPrototype->directDefineOwnProperty(state, ObjectPropertyName(state, Value(state.context()->vmInstance()->globalSymbols().toPrimitive)),
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ObjectPropertyDescriptor(new NativeFunctionObject(state, NativeFunctionInfo(AtomicString(state, String::fromASCII("[Symbol.toPrimitive]")), builtinSymbolToPrimitive, 1, NativeFunctionInfo::Strict)), (ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::ConfigurablePresent)));
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m_symbolPrototype->directDefineOwnProperty(state, ObjectPropertyName(state, Value(state.context()->vmInstance()->globalSymbols().toStringTag)),
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ObjectPropertyDescriptor(state.context()->staticStrings().Symbol.string(), (ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::ConfigurablePresent)));
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{
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Value getter = new NativeFunctionObject(state, NativeFunctionInfo(state.context()->staticStrings().getDescription, builtinSymbolDescriptionGetter, 0, NativeFunctionInfo::Strict));
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JSGetterSetter gs(getter, Value());
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ObjectPropertyDescriptor desc(gs, ObjectPropertyDescriptor::ConfigurablePresent);
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m_symbolPrototype->directDefineOwnProperty(state, ObjectPropertyName(state, state.context()->staticStrings().description), desc);
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}
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#define DECLARE_GLOBAL_SYMBOLS(name) \
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m_symbol->directDefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().name), ObjectPropertyDescriptor(Value(state.context()->vmInstance()->globalSymbols().name), (ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::NonEnumerablePresent | ObjectPropertyDescriptor::NonWritablePresent | ObjectPropertyDescriptor::NonConfigurablePresent)));
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DEFINE_GLOBAL_SYMBOLS(DECLARE_GLOBAL_SYMBOLS);
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m_symbol->setFunctionPrototype(state, m_symbolPrototype);
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m_symbolProxyObject = new SymbolObject(state, state.context()->vmInstance()->globalSymbols().iterator);
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redefineOwnProperty(state, ObjectPropertyName(state.context()->staticStrings().Symbol),
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ObjectPropertyDescriptor(m_symbol, (ObjectPropertyDescriptor::PresentAttribute)(ObjectPropertyDescriptor::WritablePresent | ObjectPropertyDescriptor::ConfigurablePresent)));
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}
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} // namespace Escargot
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