зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
4.0 KiB
C++
118 строки
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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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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#ifndef js_public_Object_h
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#define js_public_Object_h
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#include "js/shadow/Object.h" // JS::shadow::Object
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#include "mozilla/Assertions.h" // MOZ_ASSERT
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#include <stddef.h> // size_t
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#include <stdint.h> // uint32_t
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#include "jstypes.h" // JS_PUBLIC_API
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#include "js/Class.h" // js::ESClass, JSCLASS_RESERVED_SLOTS, JSCLASS_HAS_PRIVATE
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#include "js/Realm.h" // JS::GetCompartmentForRealm
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#include "js/RootingAPI.h" // JS::{,Mutable}Handle
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#include "js/Value.h" // JS::Value
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struct JS_PUBLIC_API JSContext;
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class JS_PUBLIC_API JSObject;
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namespace JS {
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class JS_PUBLIC_API Compartment;
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/**
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* Determine the ECMAScript "class" -- Date, String, RegExp, and all the other
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* builtin object types (described in ECMAScript in terms of an objecting having
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* "an [[ArrayBufferData]] internal slot" or similar language for other kinds of
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* object -- of the provided object.
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*
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* If this function is passed a wrapper that can be unwrapped, the determination
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* is performed on that object. If the wrapper can't be unwrapped, and it's not
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* a wrapper that prefers to treat this operation as a failure, this function
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* will indicate that the object is |js::ESClass::Other|.
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*/
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extern JS_PUBLIC_API bool GetBuiltinClass(JSContext* cx, Handle<JSObject*> obj,
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js::ESClass* cls);
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/** Get the |JSClass| of an object. */
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inline const JSClass* GetClass(const JSObject* obj) {
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return reinterpret_cast<const shadow::Object*>(obj)->shape->base->clasp;
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}
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/**
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* Get the |JS::Compartment*| of an object.
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*
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* Note that the compartment of an object in this realm, that is a
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* cross-compartment wrapper around an object from another realm, is the
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* compartment of this realm.
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*/
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static MOZ_ALWAYS_INLINE Compartment* GetCompartment(JSObject* obj) {
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Realm* realm = reinterpret_cast<shadow::Object*>(obj)->shape->base->realm;
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return GetCompartmentForRealm(realm);
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}
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/**
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* Get the private value stored for an object whose class has a private.
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*
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* It is safe to call this function within |obj|'s finalize hook.
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*/
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inline void* GetPrivate(JSObject* obj) {
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MOZ_ASSERT(GetClass(obj)->flags & JSCLASS_HAS_PRIVATE);
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const auto* nobj = reinterpret_cast<const shadow::Object*>(obj);
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return nobj->fixedSlots()[nobj->numFixedSlots()].toPrivate();
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}
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/**
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* Set the private value for |obj|.
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*
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* This function may called during the finalization of |obj|.
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*/
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extern JS_PUBLIC_API void SetPrivate(JSObject* obj, void* data);
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/**
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* Get the value stored in a reserved slot in an object.
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*
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* If |obj| is known to be a proxy and you're willing to use friend APIs,
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* |js::GetProxyReservedSlot| in "js/Proxy.h" is very slightly more efficient.
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*/
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inline const Value& GetReservedSlot(JSObject* obj, size_t slot) {
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MOZ_ASSERT(slot < JSCLASS_RESERVED_SLOTS(GetClass(obj)));
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return reinterpret_cast<const shadow::Object*>(obj)->slotRef(slot);
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}
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namespace detail {
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extern JS_FRIEND_API void SetReservedSlotWithBarrier(JSObject* obj, size_t slot,
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const Value& value);
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} // namespace detail
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/**
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* Store a value in an object's reserved slot.
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*
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* This can be used with both native objects and proxies. However, if |obj| is
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* known to be a proxy, |js::SetProxyReservedSlot| in "js/Proxy.h" is very
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* slightly more efficient.
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*/
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inline void SetReservedSlot(JSObject* obj, size_t slot, const Value& value) {
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MOZ_ASSERT(slot < JSCLASS_RESERVED_SLOTS(GetClass(obj)));
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auto* sobj = reinterpret_cast<shadow::Object*>(obj);
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if (sobj->slotRef(slot).isGCThing() || value.isGCThing()) {
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detail::SetReservedSlotWithBarrier(obj, slot, value);
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} else {
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sobj->slotRef(slot) = value;
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}
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}
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} // namespace JS
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#endif // js_public_Object_h
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