mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
468 lines
13 KiB
C++
468 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "jsweakmap.h"
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#include <string.h>
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#include "jsapi.h"
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#include "jscntxt.h"
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#include "jsfriendapi.h"
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#include "jsobj.h"
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#include "jswrapper.h"
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#include "vm/GlobalObject.h"
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#include "vm/WeakMapObject.h"
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#include "jsobjinlines.h"
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using namespace js;
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WeakMapBase::WeakMapBase(JSObject *memOf, JSCompartment *c)
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: memberOf(memOf),
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compartment(c),
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next(WeakMapNotInList)
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{
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JS_ASSERT_IF(memberOf, memberOf->compartment() == c);
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}
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WeakMapBase::~WeakMapBase()
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{
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JS_ASSERT(next == WeakMapNotInList);
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}
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bool
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WeakMapBase::markCompartmentIteratively(JSCompartment *c, JSTracer *tracer)
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{
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bool markedAny = false;
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for (WeakMapBase *m = c->gcWeakMapList; m; m = m->next) {
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if (m->markIteratively(tracer))
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markedAny = true;
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}
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return markedAny;
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}
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void
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WeakMapBase::sweepCompartment(JSCompartment *c)
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{
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for (WeakMapBase *m = c->gcWeakMapList; m; m = m->next)
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m->sweep();
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}
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void
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WeakMapBase::traceAllMappings(WeakMapTracer *tracer)
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{
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JSRuntime *rt = tracer->runtime;
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for (CompartmentsIter c(rt, SkipAtoms); !c.done(); c.next()) {
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for (WeakMapBase *m = c->gcWeakMapList; m; m = m->next)
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m->traceMappings(tracer);
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}
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}
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void
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WeakMapBase::resetCompartmentWeakMapList(JSCompartment *c)
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{
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JS_ASSERT(WeakMapNotInList != nullptr);
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WeakMapBase *m = c->gcWeakMapList;
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c->gcWeakMapList = nullptr;
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while (m) {
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WeakMapBase *n = m->next;
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m->next = WeakMapNotInList;
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m = n;
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}
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}
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bool
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WeakMapBase::saveCompartmentWeakMapList(JSCompartment *c, WeakMapVector &vector)
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{
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WeakMapBase *m = c->gcWeakMapList;
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while (m) {
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if (!vector.append(m))
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return false;
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m = m->next;
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}
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return true;
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}
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void
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WeakMapBase::restoreCompartmentWeakMapLists(WeakMapVector &vector)
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{
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for (WeakMapBase **p = vector.begin(); p != vector.end(); p++) {
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WeakMapBase *m = *p;
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JS_ASSERT(m->next == WeakMapNotInList);
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JSCompartment *c = m->compartment;
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m->next = c->gcWeakMapList;
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c->gcWeakMapList = m;
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}
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}
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void
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WeakMapBase::removeWeakMapFromList(WeakMapBase *weakmap)
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{
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JSCompartment *c = weakmap->compartment;
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for (WeakMapBase **p = &c->gcWeakMapList; *p; p = &(*p)->next) {
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if (*p == weakmap) {
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*p = (*p)->next;
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weakmap->next = WeakMapNotInList;
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break;
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}
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}
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}
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static JSObject *
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GetKeyArg(JSContext *cx, CallArgs &args)
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{
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if (args[0].isPrimitive()) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT);
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return nullptr;
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}
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return &args[0].toObject();
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}
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JS_ALWAYS_INLINE bool
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IsWeakMap(HandleValue v)
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{
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return v.isObject() && v.toObject().is<WeakMapObject>();
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}
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JS_ALWAYS_INLINE bool
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WeakMap_has_impl(JSContext *cx, CallArgs args)
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{
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JS_ASSERT(IsWeakMap(args.thisv()));
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if (args.length() < 1) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
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"WeakMap.has", "0", "s");
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return false;
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}
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JSObject *key = GetKeyArg(cx, args);
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if (!key)
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return false;
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if (ObjectValueMap *map = args.thisv().toObject().as<WeakMapObject>().getMap()) {
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if (map->has(key)) {
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args.rval().setBoolean(true);
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return true;
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}
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}
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args.rval().setBoolean(false);
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return true;
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}
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static bool
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WeakMap_has(JSContext *cx, unsigned argc, Value *vp)
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{
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CallArgs args = CallArgsFromVp(argc, vp);
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return CallNonGenericMethod<IsWeakMap, WeakMap_has_impl>(cx, args);
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}
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JS_ALWAYS_INLINE bool
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WeakMap_clear_impl(JSContext *cx, CallArgs args)
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{
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JS_ASSERT(IsWeakMap(args.thisv()));
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// We can't js_delete the weakmap because the data gathered during GC
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// is used by the Cycle Collector
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if (ObjectValueMap *map = args.thisv().toObject().as<WeakMapObject>().getMap())
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map->clear();
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args.rval().setUndefined();
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return true;
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}
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static bool
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WeakMap_clear(JSContext *cx, unsigned argc, Value *vp)
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{
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CallArgs args = CallArgsFromVp(argc, vp);
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return CallNonGenericMethod<IsWeakMap, WeakMap_clear_impl>(cx, args);
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}
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JS_ALWAYS_INLINE bool
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WeakMap_get_impl(JSContext *cx, CallArgs args)
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{
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JS_ASSERT(IsWeakMap(args.thisv()));
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if (args.length() < 1) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
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"WeakMap.get", "0", "s");
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return false;
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}
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JSObject *key = GetKeyArg(cx, args);
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if (!key)
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return false;
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if (ObjectValueMap *map = args.thisv().toObject().as<WeakMapObject>().getMap()) {
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if (ObjectValueMap::Ptr ptr = map->lookup(key)) {
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// Read barrier to prevent an incorrectly gray value from escaping the
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// weak map. See the comment before UnmarkGrayChildren in gc/Marking.cpp
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ExposeValueToActiveJS(ptr->value().get());
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args.rval().set(ptr->value());
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return true;
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}
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}
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args.rval().set((args.length() > 1) ? args[1] : UndefinedValue());
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return true;
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}
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static bool
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WeakMap_get(JSContext *cx, unsigned argc, Value *vp)
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{
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CallArgs args = CallArgsFromVp(argc, vp);
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return CallNonGenericMethod<IsWeakMap, WeakMap_get_impl>(cx, args);
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}
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JS_ALWAYS_INLINE bool
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WeakMap_delete_impl(JSContext *cx, CallArgs args)
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{
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JS_ASSERT(IsWeakMap(args.thisv()));
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if (args.length() < 1) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
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"WeakMap.delete", "0", "s");
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return false;
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}
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JSObject *key = GetKeyArg(cx, args);
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if (!key)
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return false;
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if (ObjectValueMap *map = args.thisv().toObject().as<WeakMapObject>().getMap()) {
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if (ObjectValueMap::Ptr ptr = map->lookup(key)) {
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map->remove(ptr);
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args.rval().setBoolean(true);
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return true;
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}
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}
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args.rval().setBoolean(false);
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return true;
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}
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static bool
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WeakMap_delete(JSContext *cx, unsigned argc, Value *vp)
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{
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CallArgs args = CallArgsFromVp(argc, vp);
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return CallNonGenericMethod<IsWeakMap, WeakMap_delete_impl>(cx, args);
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}
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static bool
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TryPreserveReflector(JSContext *cx, HandleObject obj)
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{
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if (obj->getClass()->ext.isWrappedNative ||
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(obj->getClass()->flags & JSCLASS_IS_DOMJSCLASS) ||
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(obj->is<ProxyObject>() &&
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obj->as<ProxyObject>().handler()->family() == GetDOMProxyHandlerFamily()))
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{
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JS_ASSERT(cx->runtime()->preserveWrapperCallback);
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if (!cx->runtime()->preserveWrapperCallback(cx, obj)) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_WEAKMAP_KEY);
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return false;
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}
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}
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return true;
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}
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static inline void
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WeakMapPostWriteBarrier(JSRuntime *rt, ObjectValueMap *weakMap, JSObject *key)
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{
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#ifdef JSGC_GENERATIONAL
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/*
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* Strip the barriers from the type before inserting into the store buffer.
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* This will automatically ensure that barriers do not fire during GC.
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*
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* Some compilers complain about instantiating the WeakMap class for
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* unbarriered type arguments, so we cast to a HashMap instead. Because of
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* WeakMap's multiple inheritace, We need to do this in two stages, first to
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* the HashMap base class and then to the unbarriered version.
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*/
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ObjectValueMap::Base *baseHashMap = static_cast<ObjectValueMap::Base *>(weakMap);
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typedef HashMap<JSObject *, Value> UnbarrieredMap;
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UnbarrieredMap *unbarrieredMap = reinterpret_cast<UnbarrieredMap *>(baseHashMap);
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typedef gc::HashKeyRef<UnbarrieredMap, JSObject *> Ref;
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if (key && IsInsideNursery(rt, key))
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rt->gcStoreBuffer.putGeneric(Ref((unbarrieredMap), key));
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#endif
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}
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JS_ALWAYS_INLINE bool
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WeakMap_set_impl(JSContext *cx, CallArgs args)
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{
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JS_ASSERT(IsWeakMap(args.thisv()));
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if (args.length() < 1) {
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JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
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"WeakMap.set", "0", "s");
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return false;
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}
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RootedObject key(cx, GetKeyArg(cx, args));
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if (!key)
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return false;
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RootedValue value(cx, (args.length() > 1) ? args[1] : UndefinedValue());
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Rooted<JSObject*> thisObj(cx, &args.thisv().toObject());
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ObjectValueMap *map = thisObj->as<WeakMapObject>().getMap();
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if (!map) {
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map = cx->new_<ObjectValueMap>(cx, thisObj.get());
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if (!map->init()) {
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js_delete(map);
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JS_ReportOutOfMemory(cx);
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return false;
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}
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thisObj->setPrivate(map);
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}
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// Preserve wrapped native keys to prevent wrapper optimization.
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if (!TryPreserveReflector(cx, key))
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return false;
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if (JSWeakmapKeyDelegateOp op = key->getClass()->ext.weakmapKeyDelegateOp) {
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RootedObject delegate(cx, op(key));
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if (delegate && !TryPreserveReflector(cx, delegate))
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return false;
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}
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JS_ASSERT(key->compartment() == thisObj->compartment());
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JS_ASSERT_IF(value.isObject(), value.toObject().compartment() == thisObj->compartment());
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if (!map->put(key, value)) {
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JS_ReportOutOfMemory(cx);
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return false;
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}
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WeakMapPostWriteBarrier(cx->runtime(), map, key.get());
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args.rval().setUndefined();
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return true;
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}
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static bool
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WeakMap_set(JSContext *cx, unsigned argc, Value *vp)
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{
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CallArgs args = CallArgsFromVp(argc, vp);
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return CallNonGenericMethod<IsWeakMap, WeakMap_set_impl>(cx, args);
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}
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JS_FRIEND_API(bool)
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JS_NondeterministicGetWeakMapKeys(JSContext *cx, JSObject *objArg, JSObject **ret)
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{
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RootedObject obj(cx, objArg);
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obj = UncheckedUnwrap(obj);
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if (!obj || !obj->is<WeakMapObject>()) {
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*ret = nullptr;
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return true;
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}
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RootedObject arr(cx, NewDenseEmptyArray(cx));
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if (!arr)
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return false;
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ObjectValueMap *map = obj->as<WeakMapObject>().getMap();
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if (map) {
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// Prevent GC from mutating the weakmap while iterating.
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gc::AutoSuppressGC suppress(cx);
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for (ObjectValueMap::Base::Range r = map->all(); !r.empty(); r.popFront()) {
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RootedObject key(cx, r.front().key());
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if (!cx->compartment()->wrap(cx, &key))
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return false;
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if (!NewbornArrayPush(cx, arr, ObjectValue(*key)))
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return false;
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}
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}
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*ret = arr;
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return true;
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}
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static void
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WeakMap_mark(JSTracer *trc, JSObject *obj)
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{
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if (ObjectValueMap *map = obj->as<WeakMapObject>().getMap())
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map->trace(trc);
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}
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static void
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WeakMap_finalize(FreeOp *fop, JSObject *obj)
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{
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if (ObjectValueMap *map = obj->as<WeakMapObject>().getMap()) {
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map->check();
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#ifdef DEBUG
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map->~ObjectValueMap();
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memset(static_cast<void *>(map), 0xdc, sizeof(*map));
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fop->free_(map);
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#else
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fop->delete_(map);
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#endif
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}
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}
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static bool
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WeakMap_construct(JSContext *cx, unsigned argc, Value *vp)
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{
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JSObject *obj = NewBuiltinClassInstance(cx, &WeakMapObject::class_);
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if (!obj)
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return false;
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vp->setObject(*obj);
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return true;
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}
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const Class WeakMapObject::class_ = {
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"WeakMap",
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JSCLASS_HAS_PRIVATE | JSCLASS_IMPLEMENTS_BARRIERS |
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JSCLASS_HAS_CACHED_PROTO(JSProto_WeakMap),
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JS_PropertyStub, /* addProperty */
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JS_DeletePropertyStub, /* delProperty */
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JS_PropertyStub, /* getProperty */
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JS_StrictPropertyStub, /* setProperty */
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JS_EnumerateStub,
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JS_ResolveStub,
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JS_ConvertStub,
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WeakMap_finalize,
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nullptr, /* checkAccess */
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nullptr, /* call */
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nullptr, /* construct */
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nullptr, /* xdrObject */
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WeakMap_mark
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};
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static const JSFunctionSpec weak_map_methods[] = {
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JS_FN("has", WeakMap_has, 1, 0),
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JS_FN("get", WeakMap_get, 2, 0),
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JS_FN("delete", WeakMap_delete, 1, 0),
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JS_FN("set", WeakMap_set, 2, 0),
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JS_FN("clear", WeakMap_clear, 0, 0),
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JS_FS_END
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};
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JSObject *
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js_InitWeakMapClass(JSContext *cx, HandleObject obj)
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{
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JS_ASSERT(obj->isNative());
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Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
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RootedObject weakMapProto(cx, global->createBlankPrototype(cx, &WeakMapObject::class_));
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if (!weakMapProto)
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return nullptr;
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RootedFunction ctor(cx, global->createConstructor(cx, WeakMap_construct,
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cx->names().WeakMap, 0));
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if (!ctor)
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return nullptr;
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if (!LinkConstructorAndPrototype(cx, ctor, weakMapProto))
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return nullptr;
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if (!DefinePropertiesAndBrand(cx, weakMapProto, nullptr, weak_map_methods))
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return nullptr;
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if (!DefineConstructorAndPrototype(cx, global, JSProto_WeakMap, ctor, weakMapProto))
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return nullptr;
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return weakMapProto;
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}
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