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101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is SpiderMonkey code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gregor Wagner <anygregor@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jscell_h___
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#define jscell_h___
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struct JSCompartment;
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namespace js {
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namespace gc {
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template <typename T> struct Arena;
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struct ArenaBitmap;
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struct MarkingDelay;
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struct Chunk;
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struct FreeCell;
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/*
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* A GC cell is the base class for GC Things like JSObject, JSShortString,
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* JSFunction, JSXML and for an empty cell called FreeCell. It helps avoiding
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* casts from an Object to a Cell whenever we call GC related mark functions.
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* Cell is not the base Class for JSString because static initialization
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* (used for unitStringTables) does not work with inheritance.
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*/
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struct Cell {
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static const size_t CellShift = 3;
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static const size_t CellSize = size_t(1) << CellShift;
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static const size_t CellMask = CellSize - 1;
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inline Arena<Cell> *arena() const;
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inline Chunk *chunk() const;
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inline ArenaBitmap *bitmap() const;
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JS_ALWAYS_INLINE size_t cellIndex() const;
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JS_ALWAYS_INLINE bool isMarked(uint32 color) const;
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JS_ALWAYS_INLINE bool markIfUnmarked(uint32 color) const;
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JS_ALWAYS_INLINE void unmark(uint32 color) const;
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inline JSCompartment *compartment() const;
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JS_ALWAYS_INLINE js::gc::FreeCell *asFreeCell() {
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return reinterpret_cast<FreeCell *>(this);
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}
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JS_ALWAYS_INLINE const js::gc::FreeCell *asFreeCell() const {
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return reinterpret_cast<const FreeCell *>(this);
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}
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};
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/* FreeCell has always size 8 */
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struct FreeCell : Cell {
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union {
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FreeCell *link;
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double data;
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};
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};
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JS_STATIC_ASSERT(sizeof(FreeCell) == 8);
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} /* namespace gc */
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} /* namespace js */
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#endif /* jscell_h___ */
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