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121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=99:
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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 Mozilla Communicator client code, released
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* March 31, 1998.
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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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* Igor Bukanov <igor@mir2.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 jspropertycacheinlines_h___
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#define jspropertycacheinlines_h___
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#include "jslock.h"
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#include "jspropertycache.h"
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#include "jsscope.h"
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/*
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* This method is designed to inline the fast path in js_Interpret, so it makes
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* "just-so" restrictions on parameters, e.g. pobj and obj should not be the
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* same variable, since for JOF_PROP-mode opcodes, obj must not be changed
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* because of a cache miss.
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*
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* On return, if name is null then obj points to the scope chain element in
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* which the property was found, pobj is locked, and entry is valid. If name is
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* non-null then no object is locked but entry is still set correctly for use,
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* e.g., by PropertyCache::fill and name should be used as the id to find.
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*
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* We must lock pobj on a hit in order to close races with threads that might
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* be deleting a property from its scope, or otherwise invalidating property
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* caches (on all threads) by re-generating JSObject::shape().
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*/
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JS_ALWAYS_INLINE void
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js::PropertyCache::test(JSContext *cx, jsbytecode *pc, JSObject *&obj,
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JSObject *&pobj, PropertyCacheEntry *&entry, PropertyName *&name)
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{
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JS_ASSERT(this == &JS_PROPERTY_CACHE(cx));
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const Shape *kshape = obj->lastProperty();
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entry = &table[hash(pc, kshape)];
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PCMETER(pctestentry = entry);
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PCMETER(tests++);
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JS_ASSERT(&obj != &pobj);
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if (entry->kpc == pc && entry->kshape == kshape) {
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JSObject *tmp;
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pobj = obj;
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if (entry->isPrototypePropertyHit() &&
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(tmp = pobj->getProto()) != NULL) {
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pobj = tmp;
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}
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if (pobj->lastProperty() == entry->pshape) {
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PCMETER(pchits++);
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PCMETER(entry->isOwnPropertyHit() || protopchits++);
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name = NULL;
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return;
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}
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}
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name = fullTest(cx, pc, &obj, &pobj, entry);
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if (name)
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PCMETER(misses++);
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}
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JS_ALWAYS_INLINE bool
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js::PropertyCache::testForSet(JSContext *cx, jsbytecode *pc, JSObject *obj,
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PropertyCacheEntry **entryp, JSObject **obj2p, PropertyName **namep)
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{
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JS_ASSERT(this == &JS_PROPERTY_CACHE(cx));
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const Shape *kshape = obj->lastProperty();
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PropertyCacheEntry *entry = &table[hash(pc, kshape)];
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*entryp = entry;
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PCMETER(pctestentry = entry);
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PCMETER(tests++);
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PCMETER(settests++);
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if (entry->kpc == pc && entry->kshape == kshape)
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return true;
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PropertyName *name = fullTest(cx, pc, &obj, obj2p, entry);
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JS_ASSERT(name);
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PCMETER(misses++);
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PCMETER(setmisses++);
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*namep = name;
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return false;
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}
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#endif /* jspropertycacheinlines_h___ */
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