jspropertycacheinlines.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sw=4 et tw=99:
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef jspropertycacheinlines_h___
#define jspropertycacheinlines_h___
#include "jslock.h"
#include "jspropertycache.h"
#include "jsscope.h"
/*
* 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
js::PropertyCache::test(JSContext *cx, jsbytecode *pc, JSObject *&obj,
JSObject *&pobj, PropertyCacheEntry *&entry, PropertyName *&name)
{
AutoAssertNoGC nogc;
JS_ASSERT(this == &cx->propertyCache());
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
js::PropertyCache::testForSet(JSContext *cx, jsbytecode *pc, JSObject *obj,
PropertyCacheEntry **entryp, JSObject **obj2p, PropertyName **namep)
{
JS_ASSERT(this == &cx->propertyCache());
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___ */