зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
3.8 KiB
C++
129 строки
3.8 KiB
C++
/* -*- Mode: c++; c-basic-offset: 4; tab-width: 40; indent-tabs-mode: nil -*- */
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/* vim: set ts=40 sw=4 et tw=99: */
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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 the Mozilla SpiderMonkey property tree implementation
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2002-2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brendan Eich <brendan@mozilla.org>
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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 jspropertytree_h___
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#define jspropertytree_h___
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#include "jshashtable.h"
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#include "jsprvtd.h"
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namespace js {
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struct ShapeHasher {
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typedef js::Shape *Key;
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typedef const js::Shape *Lookup;
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static inline HashNumber hash(const Lookup l);
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static inline bool match(Key k, Lookup l);
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};
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typedef HashSet<js::Shape *, ShapeHasher, SystemAllocPolicy> KidsHash;
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class KidsPointer {
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private:
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enum {
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SHAPE = 0,
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HASH = 1,
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TAG = 1
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};
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jsuword w;
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public:
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bool isNull() const { return !w; }
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void setNull() { w = 0; }
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bool isShape() const { return (w & TAG) == SHAPE && !isNull(); }
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js::Shape *toShape() const {
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JS_ASSERT(isShape());
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return reinterpret_cast<js::Shape *>(w & ~jsuword(TAG));
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}
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void setShape(js::Shape *shape) {
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JS_ASSERT(shape);
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JS_ASSERT((reinterpret_cast<jsuword>(shape) & TAG) == 0);
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w = reinterpret_cast<jsuword>(shape) | SHAPE;
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}
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bool isHash() const { return (w & TAG) == HASH; }
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KidsHash *toHash() const {
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JS_ASSERT(isHash());
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return reinterpret_cast<KidsHash *>(w & ~jsuword(TAG));
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}
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void setHash(KidsHash *hash) {
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JS_ASSERT(hash);
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JS_ASSERT((reinterpret_cast<jsuword>(hash) & TAG) == 0);
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w = reinterpret_cast<jsuword>(hash) | HASH;
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}
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#ifdef DEBUG
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void checkConsistency(const js::Shape *aKid) const;
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#endif
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};
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class PropertyTree
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{
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friend struct ::JSFunction;
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JSCompartment *compartment;
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bool insertChild(JSContext *cx, js::Shape *parent, js::Shape *child);
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PropertyTree();
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public:
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enum { MAX_HEIGHT = 128 };
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PropertyTree(JSCompartment *comp)
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: compartment(comp)
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{
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}
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js::Shape *newShape(JSContext *cx);
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js::Shape *getChild(JSContext *cx, js::Shape *parent, const js::Shape &child);
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#ifdef DEBUG
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static void dumpShapes(JSContext *cx);
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static void meter(JSBasicStats *bs, js::Shape *node);
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#endif
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};
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} /* namespace js */
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#endif /* jspropertytree_h___ */
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