5a9a0b20e7
Motivation for this is reducing the size of the native context. R=mvstanton@chromium.org Review URL: https://codereview.chromium.org/1089303003 Cr-Commit-Position: refs/heads/master@{#27917}
118 lines
3.1 KiB
JavaScript
118 lines
3.1 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Expects following symbols to be set in the bootstrapper during genesis:
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// - symbolHasInstance
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// - symbolIsConcatSpreadable
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// - symbolIsRegExp
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// - symbolIterator
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// - symbolToStringTag
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// - symbolUnscopables
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var $symbolToString;
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(function() {
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"use strict";
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%CheckIsBootstrapping();
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var GlobalObject = global.Object;
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var GlobalSymbol = global.Symbol;
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// -------------------------------------------------------------------
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function SymbolConstructor(x) {
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if (%_IsConstructCall()) throw MakeTypeError(kNotConstructor, "Symbol");
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// NOTE: Passing in a Symbol value will throw on ToString().
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return %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x));
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}
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function SymbolToString() {
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if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
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throw MakeTypeError(kIncompatibleMethodReceiver,
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"Symbol.prototype.toString", this);
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}
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var description = %SymbolDescription(%_ValueOf(this));
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return "Symbol(" + (IS_UNDEFINED(description) ? "" : description) + ")";
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}
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function SymbolValueOf() {
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if (!(IS_SYMBOL(this) || IS_SYMBOL_WRAPPER(this))) {
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throw MakeTypeError(kIncompatibleMethodReceiver,
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"Symbol.prototype.valueOf", this);
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}
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return %_ValueOf(this);
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}
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function SymbolFor(key) {
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key = TO_STRING_INLINE(key);
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var registry = %SymbolRegistry();
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if (IS_UNDEFINED(registry.for[key])) {
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var symbol = %CreateSymbol(key);
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registry.for[key] = symbol;
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registry.keyFor[symbol] = key;
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}
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return registry.for[key];
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}
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function SymbolKeyFor(symbol) {
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if (!IS_SYMBOL(symbol)) throw MakeTypeError("not_a_symbol", [symbol]);
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return %SymbolRegistry().keyFor[symbol];
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}
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// ES6 19.1.2.8
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function ObjectGetOwnPropertySymbols(obj) {
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obj = ToObject(obj);
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// TODO(arv): Proxies use a shared trap for String and Symbol keys.
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return ObjectGetOwnPropertyKeys(obj, PROPERTY_ATTRIBUTES_STRING);
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}
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//-------------------------------------------------------------------
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%SetCode(GlobalSymbol, SymbolConstructor);
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%FunctionSetPrototype(GlobalSymbol, new GlobalObject());
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InstallConstants(GlobalSymbol, [
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// TODO(rossberg): expose when implemented.
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// "hasInstance", symbolHasInstance,
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// "isConcatSpreadable", symbolIsConcatSpreadable,
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// "isRegExp", symbolIsRegExp,
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"iterator", symbolIterator,
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// TODO(dslomov, caitp): Currently defined in harmony-tostring.js ---
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// Move here when shipping
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// "toStringTag", symbolToStringTag,
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"unscopables", symbolUnscopables
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]);
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InstallFunctions(GlobalSymbol, DONT_ENUM, [
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"for", SymbolFor,
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"keyFor", SymbolKeyFor
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]);
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%AddNamedProperty(
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GlobalSymbol.prototype, "constructor", GlobalSymbol, DONT_ENUM);
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%AddNamedProperty(
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GlobalSymbol.prototype, symbolToStringTag, "Symbol", DONT_ENUM | READ_ONLY);
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InstallFunctions(GlobalSymbol.prototype, DONT_ENUM, [
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"toString", SymbolToString,
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"valueOf", SymbolValueOf
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]);
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InstallFunctions(GlobalObject, DONT_ENUM, [
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"getOwnPropertySymbols", ObjectGetOwnPropertySymbols
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]);
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$symbolToString = SymbolToString;
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})();
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