/js/src/jspropertycacheinlines.h
http://github.com/zpao/v8monkey · C Header · 122 lines · 55 code · 12 blank · 55 comment · 17 complexity · 4d213dc78eb1e5cb68b9f420109792e7 MD5 · raw file
- /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- * vim: set ts=8 sw=4 et tw=99:
- *
- * ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Communicator client code, released
- * March 31, 1998.
- *
- * The Initial Developer of the Original Code is
- * Mozilla Corporation.
- * Portions created by the Initial Developer are Copyright (C) 2010
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Igor Bukanov <igor@mir2.org>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef jspropertycacheinlines_h___
- #define jspropertycacheinlines_h___
- #include "jslock.h"
- #include "jspropertycache.h"
- #include "jsscope.h"
- using namespace js;
- /*
- * This method is designed to inline the fast path in js_Interpret, so it makes
- * "just-so" restrictions on parameters, e.g. pobj and obj should not be the
- * same variable, since for JOF_PROP-mode opcodes, obj must not be changed
- * because of a cache miss.
- *
- * On return, if name is null then obj points to the scope chain element in
- * which the property was found, pobj is locked, and entry is valid. If name is
- * non-null then no object is locked but entry is still set correctly for use,
- * e.g., by PropertyCache::fill and name should be used as the id to find.
- *
- * We must lock pobj on a hit in order to close races with threads that might
- * be deleting a property from its scope, or otherwise invalidating property
- * caches (on all threads) by re-generating JSObject::shape().
- */
- JS_ALWAYS_INLINE void
- PropertyCache::test(JSContext *cx, jsbytecode *pc, JSObject *&obj,
- JSObject *&pobj, PropertyCacheEntry *&entry, PropertyName *&name)
- {
- JS_ASSERT(this == &JS_PROPERTY_CACHE(cx));
- const Shape *kshape = obj->lastProperty();
- entry = &table[hash(pc, kshape)];
- PCMETER(pctestentry = entry);
- PCMETER(tests++);
- JS_ASSERT(&obj != &pobj);
- if (entry->kpc == pc && entry->kshape == kshape) {
- JSObject *tmp;
- pobj = obj;
- if (entry->isPrototypePropertyHit() &&
- (tmp = pobj->getProto()) != NULL) {
- pobj = tmp;
- }
- if (pobj->lastProperty() == entry->pshape) {
- PCMETER(pchits++);
- PCMETER(entry->isOwnPropertyHit() || protopchits++);
- name = NULL;
- return;
- }
- }
- name = fullTest(cx, pc, &obj, &pobj, entry);
- if (name)
- PCMETER(misses++);
- }
- JS_ALWAYS_INLINE bool
- PropertyCache::testForSet(JSContext *cx, jsbytecode *pc, JSObject *obj,
- PropertyCacheEntry **entryp, JSObject **obj2p, PropertyName **namep)
- {
- JS_ASSERT(this == &JS_PROPERTY_CACHE(cx));
- const Shape *kshape = obj->lastProperty();
- PropertyCacheEntry *entry = &table[hash(pc, kshape)];
- *entryp = entry;
- PCMETER(pctestentry = entry);
- PCMETER(tests++);
- PCMETER(settests++);
- if (entry->kpc == pc && entry->kshape == kshape)
- return true;
- PropertyName *name = fullTest(cx, pc, &obj, obj2p, entry);
- JS_ASSERT(name);
- PCMETER(misses++);
- PCMETER(setmisses++);
- *namep = name;
- return false;
- }
- #endif /* jspropertycacheinlines_h___ */