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55 lines
2.3 KiB
C
55 lines
2.3 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 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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// 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_OBJECT_SLOT 0
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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 1
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// Interface objects store a number of reserved slots equal to
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// INTERFACE_OBJECT_INFO_RESERVED_SLOT + number of legacy factory functions,
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// with a maximum of js::FunctionExtended::NUM_EXTENDED_SLOTS.
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// INTERFACE_OBJECT_INFO_RESERVED_SLOT contains the DOMInterfaceInfo.
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// INTERFACE_OBJECT_FIRST_LEGACY_FACTORY_FUNCTION and higher contain the
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// JSObjects for the legacy factory functions.
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enum {
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INTERFACE_OBJECT_INFO_RESERVED_SLOT = 0,
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INTERFACE_OBJECT_FIRST_LEGACY_FACTORY_FUNCTION,
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};
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// See js::FunctionExtended::NUM_EXTENDED_SLOTS.
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#define INTERFACE_OBJECT_MAX_SLOTS 3
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// Legacy factory functions store a JSNativeHolder in the
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// LEGACY_FACTORY_FUNCTION_NATIVE_HOLDER_RESERVED_SLOT slot.
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enum { LEGACY_FACTORY_FUNCTION_NATIVE_HOLDER_RESERVED_SLOT = 0 };
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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 0
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// The slot index of raw pointer of dom object stored in observable array exotic
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// object. We need this in order to call the OnSet* and OnDelete* callbacks.
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#define OBSERVABLE_ARRAY_DOM_INTERFACE_SLOT 0
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// The slot index of backing list stored in observable array exotic object.
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#define OBSERVABLE_ARRAY_BACKING_LIST_OBJECT_SLOT 1
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#endif /* mozilla_dom_DOMSlots_h */
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