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111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Symbols. */
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#ifndef js_Symbol_h
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#define js_Symbol_h
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#include "js/shadow/Symbol.h" // JS::shadow::Symbol::WellKnownAPILimit
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#include <stddef.h> // size_t
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#include <stdint.h> // uintptr_t, uint32_t
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#include "jstypes.h" // JS_PUBLIC_API
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#include "js/TypeDecls.h"
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namespace JS {
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class JS_PUBLIC_API Symbol;
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/**
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* Create a new Symbol with the given description. This function never returns
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* a Symbol that is in the Runtime-wide symbol registry.
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*
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* If description is null, the new Symbol's [[Description]] attribute is
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* undefined.
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*/
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extern JS_PUBLIC_API Symbol* NewSymbol(JSContext* cx,
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Handle<JSString*> description);
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/**
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* Symbol.for as specified in ES6.
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*
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* Get a Symbol with the description 'key' from the Runtime-wide symbol
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* registry. If there is not already a Symbol with that description in the
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* registry, a new Symbol is created and registered. 'key' must not be null.
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*/
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extern JS_PUBLIC_API Symbol* GetSymbolFor(JSContext* cx, Handle<JSString*> key);
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/**
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* Get the [[Description]] attribute of the given symbol.
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*
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* This function is infallible. If it returns null, that means the symbol's
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* [[Description]] is undefined.
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*/
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extern JS_PUBLIC_API JSString* GetSymbolDescription(Handle<Symbol*> symbol);
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/* Well-known symbols. */
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#define JS_FOR_EACH_WELL_KNOWN_SYMBOL(MACRO) \
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MACRO(isConcatSpreadable) \
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MACRO(iterator) \
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MACRO(match) \
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MACRO(replace) \
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MACRO(search) \
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MACRO(species) \
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MACRO(hasInstance) \
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MACRO(split) \
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MACRO(toPrimitive) \
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MACRO(toStringTag) \
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MACRO(unscopables) \
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MACRO(asyncIterator) \
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MACRO(matchAll)
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enum class SymbolCode : uint32_t {
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// There is one SymbolCode for each well-known symbol.
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#define JS_DEFINE_SYMBOL_ENUM(name) name,
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JS_FOR_EACH_WELL_KNOWN_SYMBOL(
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JS_DEFINE_SYMBOL_ENUM) // SymbolCode::iterator, etc.
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#undef JS_DEFINE_SYMBOL_ENUM
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Limit,
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WellKnownAPILimit = JS::shadow::Symbol::WellKnownAPILimit,
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PrivateNameSymbol = 0xfffffffd, // created by the #PrivateName syntax.
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InSymbolRegistry =
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0xfffffffe, // created by Symbol.for() or JS::GetSymbolFor()
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UniqueSymbol = 0xffffffff // created by Symbol() or JS::NewSymbol()
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};
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/* For use in loops that iterate over the well-known symbols. */
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const size_t WellKnownSymbolLimit = size_t(SymbolCode::Limit);
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/**
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* Return the SymbolCode telling what sort of symbol `symbol` is.
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*
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* A symbol's SymbolCode never changes once it is created.
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*/
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extern JS_PUBLIC_API SymbolCode GetSymbolCode(Handle<Symbol*> symbol);
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/**
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* Get one of the well-known symbols defined by ES6. A single set of well-known
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* symbols is shared by all compartments in a JSRuntime.
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*
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* `which` must be in the range [0, WellKnownSymbolLimit).
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*/
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extern JS_PUBLIC_API Symbol* GetWellKnownSymbol(JSContext* cx,
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SymbolCode which);
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/**
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* Return true if the given JSPropertySpec::name or JSFunctionSpec::name value
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* is actually a symbol code and not a string. See JS_SYM_FN.
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*/
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inline bool PropertySpecNameIsSymbol(uintptr_t name) {
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return name != 0 && name - 1 < WellKnownSymbolLimit;
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}
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} // namespace JS
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#endif /* js_Symbol_h */
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