LCOV - app.info - js/src/jswatchpoint.cpp

LCOV - code coverage report
| Current view: | directory - js/src - jswatchpoint.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 124 | 82 | 66.1 %
| Date: | 2012-04-07 | Functions: | 16 | 12 | 75.0 %

           1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
           2                 :  *
           3                 :  * ***** BEGIN LICENSE BLOCK *****
           4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           5                 :  *
           6                 :  * The contents of this file are subject to the Mozilla Public License Version
           7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           8                 :  * the License. You may obtain a copy of the License at
           9                 :  * http://www.mozilla.org/MPL/
          10                 :  *
          11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          13                 :  * for the specific language governing rights and limitations under the
          14                 :  * License.
          15                 :  *
          16                 :  * The Original Code is an implementation of watchpoints for SpiderMonkey.
          17                 :  *
          18                 :  * The Initial Developer of the Original Code is
          19                 :  * Mozilla Foundation.
          20                 :  * Portions created by the Initial Developer are Copyright (C) 2011
          21                 :  * the Initial Developer. All Rights Reserved.
          22                 :  *
          23                 :  * Contributor(s):
          24                 :  *   Jason Orendorff <jorendorff@mozilla.com>
          25                 :  *
          26                 :  * Alternatively, the contents of this file may be used under the terms of
          27                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          28                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          30                 :  * of those above. If you wish to allow use of your version of this file only
          31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          32                 :  * use your version of this file under the terms of the MPL, indicate your
          33                 :  * decision by deleting the provisions above and replace them with the notice
          34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          35                 :  * the provisions above, a recipient may use your version of this file under
          36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          37                 :  *
          38                 :  * ***** END LICENSE BLOCK ***** */
          39                 :
          40                 : #include "jswatchpoint.h"
          41                 : #include "jsatom.h"
          42                 : #include "jsgcmark.h"
          43                 : #include "jsobjinlines.h"
          44                 :
          45                 : using namespace js;
          46                 : using namespace js::gc;
          47                 :
          48                 : inline HashNumber
          49            9629 : DefaultHasher<WatchKey>::hash(const Lookup &key)
          50                 : {
          51            9629 :     return DefaultHasher<JSObject *>::hash(key.object.get()) ^ HashId(key.id.get());
          52                 : }
          53                 :
          54                 : class AutoEntryHolder {
          55                 :     typedef WatchpointMap::Map Map;
          56                 :     Map &map;
          57                 :     Map::Ptr p;
          58                 :     uint32_t gen;
          59                 :     WatchKey key;
          60                 :
          61                 :   public:
          62            3825 :     AutoEntryHolder(Map &map, Map::Ptr p)
          63            3825 :         : map(map), p(p), gen(map.generation()), key(p->key) {
          64            3825 :         JS_ASSERT(!p->value.held);
          65            3825 :         p->value.held = true;
          66            3825 :     }
          67                 :
          68            7650 :     ~AutoEntryHolder() {
          69            3825 :         if (gen != map.generation())
          70            1509 :             p = map.lookup(key);
          71            3825 :         if (p)
          72            3825 :             p->value.held = false;
          73            3825 :     }
          74                 : };
          75                 :
          76                 : bool
          77             225 : WatchpointMap::init()
          78                 : {
          79             225 :     return map.init();
          80                 : }
          81                 :
          82                 : bool
          83            3672 : WatchpointMap::watch(JSContext *cx, JSObject *obj, jsid id,
          84                 :                      JSWatchPointHandler handler, JSObject *closure)
          85                 : {
          86            3672 :     JS_ASSERT(id == js_CheckForStringIndex(id));
          87            3672 :     JS_ASSERT(JSID_IS_STRING(id) || JSID_IS_INT(id));
          88                 :
          89            3672 :     if (!obj->setWatched(cx))
          90               0 :         return false;
          91                 :
          92            7344 :     Watchpoint w;
          93            3672 :     w.handler = handler;
          94            3672 :     w.closure = closure;
          95            3672 :     w.held = false;
          96            3672 :     if (!map.put(WatchKey(obj, id), w)) {
          97               0 :         js_ReportOutOfMemory(cx);
          98               0 :         return false;
          99                 :     }
         100            3672 :     return true;
         101                 : }
         102                 :
         103                 : void
         104               9 : WatchpointMap::unwatch(JSObject *obj, jsid id,
         105                 :                        JSWatchPointHandler *handlerp, JSObject **closurep)
         106                 : {
         107               9 :     JS_ASSERT(id == js_CheckForStringIndex(id));
         108               9 :     if (Map::Ptr p = map.lookup(WatchKey(obj, id))) {
         109               9 :         if (handlerp)
         110               0 :             *handlerp = p->value.handler;
         111               9 :         if (closurep)
         112               0 :             *closurep = p->value.closure;
         113               9 :         map.remove(p);
         114                 :     }
         115               9 : }
         116                 :
         117                 : void
         118               0 : WatchpointMap::unwatchObject(JSObject *obj)
         119                 : {
         120               0 :     for (Map::Enum r(map); !r.empty(); r.popFront()) {
         121               0 :         Map::Entry &e = r.front();
         122               0 :         if (e.key.object == obj)
         123               0 :             r.removeFront();
         124                 :     }
         125               0 : }
         126                 :
         127                 : void
         128             216 : WatchpointMap::clear()
         129                 : {
         130             216 :     map.clear();
         131             216 : }
         132                 :
         133                 : bool
         134            4439 : WatchpointMap::triggerWatchpoint(JSContext *cx, JSObject *obj, jsid id, Value *vp)
         135                 : {
         136            4439 :     JS_ASSERT(id == js_CheckForStringIndex(id));
         137            4439 :     Map::Ptr p = map.lookup(WatchKey(obj, id));
         138            4439 :     if (!p || p->value.held)
         139             614 :         return true;
         140                 :
         141            7650 :     AutoEntryHolder holder(map, p);
         142                 :
         143                 :     /* Copy the entry, since GC would invalidate p. */
         144            3825 :     JSWatchPointHandler handler = p->value.handler;
         145            3825 :     JSObject *closure = p->value.closure;
         146                 :
         147                 :     /* Determine the property's old value. */
         148                 :     Value old;
         149            3825 :     old.setUndefined();
         150            3825 :     if (obj->isNative()) {
         151            3825 :         if (const Shape *shape = obj->nativeLookup(cx, id)) {
         152             702 :             if (shape->hasSlot())
         153             675 :                 old = obj->nativeGetSlot(shape->slot());
         154                 :         }
         155                 :     }
         156                 :
         157                 :     /* Call the handler. */
         158            3825 :     return handler(cx, obj, id, old, vp, closure);
         159                 : }
         160                 :
         161                 : bool
         162           77192 : WatchpointMap::markAllIteratively(JSTracer *trc)
         163                 : {
         164           77192 :     JSRuntime *rt = trc->runtime;
         165           77192 :     bool mutated = false;
         166          245879 :     for (GCCompartmentsIter c(rt); !c.done(); c.next()) {
         167          168687 :         if (c->watchpointMap)
         168             468 :             mutated |= c->watchpointMap->markIteratively(trc);
         169                 :     }
         170           77192 :     return mutated;
         171                 : }
         172                 :
         173                 : bool
         174             468 : WatchpointMap::markIteratively(JSTracer *trc)
         175                 : {
         176             468 :     bool marked = false;
         177             504 :     for (Map::Range r = map.all(); !r.empty(); r.popFront()) {
         178              36 :         Map::Entry &e = r.front();
         179              36 :         bool objectIsLive = !IsAboutToBeFinalized(e.key.object);
         180              36 :         if (objectIsLive || e.value.held) {
         181              18 :             if (!objectIsLive) {
         182               0 :                 HeapPtrObject tmp(e.key.object);
         183               0 :                 MarkObject(trc, &tmp, "held Watchpoint object");
         184               0 :                 JS_ASSERT(tmp == e.key.object);
         185               0 :                 marked = true;
         186                 :             }
         187                 :
         188              18 :             const HeapId &id = e.key.id;
         189              18 :             JS_ASSERT(JSID_IS_STRING(id) || JSID_IS_INT(id));
         190              36 :             HeapId tmp(id.get());
         191              18 :             MarkId(trc, &tmp, "WatchKey::id");
         192              18 :             JS_ASSERT(tmp.get() == id.get());
         193                 :
         194              18 :             if (e.value.closure && IsAboutToBeFinalized(e.value.closure)) {
         195               0 :                 MarkObject(trc, &e.value.closure, "Watchpoint::closure");
         196               0 :                 marked = true;
         197                 :             }
         198                 :         }
         199                 :     }
         200             468 :     return marked;
         201                 : }
         202                 :
         203                 : void
         204               0 : WatchpointMap::markAll(JSTracer *trc)
         205                 : {
         206               0 :     for (Map::Range r = map.all(); !r.empty(); r.popFront()) {
         207               0 :         Map::Entry &e = r.front();
         208               0 :         HeapPtrObject tmpObj(e.key.object);
         209               0 :         MarkObject(trc, &tmpObj, "held Watchpoint object");
         210               0 :         JS_ASSERT(tmpObj == e.key.object);
         211                 :
         212               0 :         const HeapId &id = e.key.id;
         213               0 :         JS_ASSERT(JSID_IS_STRING(id) || JSID_IS_INT(id));
         214               0 :         HeapId tmpId(id.get());
         215               0 :         MarkId(trc, &tmpId, "WatchKey::id");
         216               0 :         JS_ASSERT(tmpId.get() == id.get());
         217                 :
         218               0 :         MarkObject(trc, &e.value.closure, "Watchpoint::closure");
         219                 :     }
         220               0 : }
         221                 :
         222                 : void
         223           38427 : WatchpointMap::sweepAll(JSRuntime *rt)
         224                 : {
         225          122124 :     for (GCCompartmentsIter c(rt); !c.done(); c.next()) {
         226           83697 :         if (WatchpointMap *wpmap = c->watchpointMap)
         227             234 :             wpmap->sweep();
         228                 :     }
         229           38427 : }
         230                 :
         231                 : void
         232             234 : WatchpointMap::sweep()
         233                 : {
         234             252 :     for (Map::Enum r(map); !r.empty(); r.popFront()) {
         235              18 :         Map::Entry &e = r.front();
         236              18 :         if (IsAboutToBeFinalized(e.key.object)) {
         237               9 :             JS_ASSERT(!e.value.held);
         238               9 :             r.removeFront();
         239                 :         }
         240                 :     }
         241             234 : }
         242                 :
         243                 : void
         244               0 : WatchpointMap::traceAll(WeakMapTracer *trc)
         245                 : {
         246               0 :     JSRuntime *rt = trc->runtime;
         247               0 :     for (JSCompartment **c = rt->compartments.begin(); c != rt->compartments.end(); ++c) {
         248               0 :         if (WatchpointMap *wpmap = (*c)->watchpointMap)
         249               0 :             wpmap->trace(trc);
         250                 :     }
         251               0 : }
         252                 :
         253                 : void
         254               0 : WatchpointMap::trace(WeakMapTracer *trc)
         255                 : {
         256               0 :     for (Map::Range r = map.all(); !r.empty(); r.popFront()) {
         257               0 :         Map::Entry &e = r.front();
         258                 :         trc->callback(trc, NULL,
         259               0 :                       e.key.object.get(), JSTRACE_OBJECT,
         260               0 :                       e.value.closure.get(), JSTRACE_OBJECT);
         261                 :     }
         262               0 : }

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