mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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243 lines
7.1 KiB
C++
243 lines
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 an implementation of watchpoints for SpiderMonkey.
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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) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jason Orendorff <jorendorff@mozilla.com>
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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#include "jswatchpoint.h"
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#include "jsatom.h"
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#include "jsgcmark.h"
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#include "jsobjinlines.h"
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using namespace js;
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using namespace js::gc;
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inline HashNumber
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DefaultHasher<WatchKey>::hash(const Lookup &key)
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{
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return DefaultHasher<JSObject *>::hash(key.object) ^ HashId(key.id);
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}
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class AutoEntryHolder {
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typedef WatchpointMap::Map Map;
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Map ↦
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Map::Ptr p;
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uint32 gen;
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WatchKey key;
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public:
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AutoEntryHolder(Map &map, Map::Ptr p)
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: map(map), p(p), gen(map.generation()), key(p->key) {
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JS_ASSERT(!p->value.held);
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p->value.held = true;
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}
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~AutoEntryHolder() {
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if (gen != map.generation())
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p = map.lookup(key);
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if (p)
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p->value.held = false;
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}
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};
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bool
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WatchpointMap::init()
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{
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return map.init();
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}
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bool
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WatchpointMap::watch(JSContext *cx, JSObject *obj, jsid id,
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JSWatchPointHandler handler, JSObject *closure)
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{
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JS_ASSERT(id == js_CheckForStringIndex(id));
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obj->setWatched(cx);
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Watchpoint w;
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w.handler = handler;
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w.closure = closure;
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w.held = false;
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if (!map.put(WatchKey(obj, id), w)) {
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js_ReportOutOfMemory(cx);
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return false;
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}
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return true;
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}
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void
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WatchpointMap::unwatch(JSObject *obj, jsid id,
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JSWatchPointHandler *handlerp, JSObject **closurep)
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{
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JS_ASSERT(id == js_CheckForStringIndex(id));
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if (Map::Ptr p = map.lookup(WatchKey(obj, id))) {
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if (handlerp)
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*handlerp = p->value.handler;
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if (closurep)
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*closurep = p->value.closure;
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map.remove(p);
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}
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}
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void
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WatchpointMap::unwatchObject(JSObject *obj)
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{
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for (Map::Enum r(map); !r.empty(); r.popFront()) {
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Map::Entry &e = r.front();
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if (e.key.object == obj)
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r.removeFront();
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}
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}
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void
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WatchpointMap::clear()
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{
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map.clear();
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}
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bool
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WatchpointMap::triggerWatchpoint(JSContext *cx, JSObject *obj, jsid id, Value *vp)
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{
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JS_ASSERT(id == js_CheckForStringIndex(id));
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Map::Ptr p = map.lookup(WatchKey(obj, id));
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if (!p || p->value.held)
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return true;
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AutoEntryHolder holder(map, p);
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/* Copy the entry, since GC would invalidate p. */
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JSWatchPointHandler handler = p->value.handler;
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JSObject *closure = p->value.closure;
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/* Determine the property's old value. */
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Value old;
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old.setUndefined();
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if (obj->isNative()) {
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if (const Shape *shape = obj->nativeLookup(id)) {
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uint32 slot = shape->slot;
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if (obj->containsSlot(slot)) {
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if (shape->isMethod()) {
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/*
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* The existing watched property is a method. Trip
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* the method read barrier in order to avoid
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* passing an uncloned function object to the
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* handler.
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*/
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Value method = ObjectValue(shape->methodObject());
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if (!obj->methodReadBarrier(cx, *shape, &method))
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return false;
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shape = obj->nativeLookup(id);
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JS_ASSERT(shape->isDataDescriptor());
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JS_ASSERT(!shape->isMethod());
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old = method;
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} else {
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old = obj->nativeGetSlot(slot);
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}
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}
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}
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}
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/* Call the handler. */
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return handler(cx, obj, id, Jsvalify(old), Jsvalify(vp), closure);
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}
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bool
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WatchpointMap::markAllIteratively(JSTracer *trc)
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{
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JSRuntime *rt = trc->context->runtime;
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if (rt->gcCurrentCompartment) {
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WatchpointMap *wpmap = rt->gcCurrentCompartment->watchpointMap;
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return wpmap && wpmap->markIteratively(trc);
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}
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bool mutated = false;
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for (JSCompartment **c = rt->compartments.begin(); c != rt->compartments.end(); ++c) {
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if ((*c)->watchpointMap)
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mutated |= (*c)->watchpointMap->markIteratively(trc);
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}
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return mutated;
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}
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bool
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WatchpointMap::markIteratively(JSTracer *trc)
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{
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bool marked = false;
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for (Map::Range r = map.all(); !r.empty(); r.popFront()) {
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Map::Entry &e = r.front();
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bool objectIsLive = e.key.object->isMarked();
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if (objectIsLive || e.value.held) {
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if (!objectIsLive) {
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MarkObject(trc, *e.key.object, "held Watchpoint object");
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marked = true;
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}
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jsid id = e.key.id;
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JS_ASSERT(JSID_IS_STRING(id) || JSID_IS_INT(id));
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MarkId(trc, id, "WatchKey::id");
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if (e.value.closure && !e.value.closure->isMarked()) {
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MarkObject(trc, *e.value.closure, "Watchpoint::closure");
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marked = true;
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}
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}
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}
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return marked;
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}
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void
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WatchpointMap::sweepAll(JSRuntime *rt)
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{
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if (rt->gcCurrentCompartment) {
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if (WatchpointMap *wpmap = rt->gcCurrentCompartment->watchpointMap)
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wpmap->sweep();
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} else {
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for (JSCompartment **c = rt->compartments.begin(); c != rt->compartments.end(); ++c) {
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if ((*c)->watchpointMap)
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(*c)->watchpointMap->sweep();
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}
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}
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}
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void
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WatchpointMap::sweep()
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{
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for (Map::Enum r(map); !r.empty(); r.popFront()) {
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Map::Entry &e = r.front();
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if (!e.key.object->isMarked()) {
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JS_ASSERT(!e.value.held);
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r.removeFront();
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}
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}
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}
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