2013-08-23 19:42:39 -07:00
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/* -*- Mode: C++; tab-width: 2; 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* This file defines various reserved slot indices used by JavaScript
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* reflections of DOM objects.
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*/
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#ifndef mozilla_dom_DOMSlots_h
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#define mozilla_dom_DOMSlots_h
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// We use slot 0 for holding the raw object. This is safe for both
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// globals and non-globals.
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#define DOM_OBJECT_SLOT 0
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// We use slot 1 for holding the expando object. This is not safe for globals
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// until bug 760095 is fixed, so that bug blocks converting Window to new
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// bindings.
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#define DOM_XRAY_EXPANDO_SLOT 1
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// We use slot 2 for holding either a JS::ObjectValue which points to the cached
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// SOW or JS::UndefinedValue if this class doesn't need SOWs. This is not safe
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// for globals until bug 760095 is fixed, so that bug blocks converting Window
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// to new bindings.
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#define DOM_OBJECT_SLOT_SOW 2
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2013-12-04 05:02:19 -08:00
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// The total number of slots non-proxy DOM objects use by default.
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// Specific objects may have more for storing cached values.
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#define DOM_INSTANCE_RESERVED_SLOTS 3
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2013-08-23 19:42:39 -07:00
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// NOTE: This is baked into the Ion JIT as 0 in codegen for LGetDOMProperty and
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// LSetDOMProperty. Those constants need to be changed accordingly if this value
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// changes.
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#define DOM_PROTO_INSTANCE_CLASS_SLOT 0
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// Interface objects store a number of reserved slots equal to
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// DOM_INTERFACE_SLOTS_BASE + number of named constructors.
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#define DOM_INTERFACE_SLOTS_BASE (DOM_XRAY_EXPANDO_SLOT + 1)
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// Interface prototype objects store a number of reserved slots equal to
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// DOM_INTERFACE_PROTO_SLOTS_BASE or DOM_INTERFACE_PROTO_SLOTS_BASE + 1 if a
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// slot for the unforgeable holder is needed.
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#define DOM_INTERFACE_PROTO_SLOTS_BASE (DOM_XRAY_EXPANDO_SLOT + 1)
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static_assert(DOM_PROTO_INSTANCE_CLASS_SLOT != DOM_XRAY_EXPANDO_SLOT,
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"Interface prototype object use both of these, so they must "
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"not be the same slot.");
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#endif /* mozilla_dom_DOMSlots_h */
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