staticvoid AssertValidCustomDataProp(NativeObject* obj, PropertyFlags flags) {
/ We onlysupport data ArrayObjectandArgumentsObject // The mechanism is deprecated so we don't want to add new uses.
MOZ_ASSERT(flags.isCustomDataProperty());
MOZ_ASSERT(!flags.isAccessorProperty());
MOZ_ASSERT(obj->is<ArrayObject>() || obj->is<ArgumentsObject>());
}
if (!Watchtower::watchPropertyAdd(cx, obj, id)) { returnfalse;
}
if (!maybeConvertToDictionaryForAdd(cx, obj)) { returnfalse;
}
ObjectFlags objectFlags = obj->shape()->objectFlags();
JSClass* =objshape()>()java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
if (obj->inDictionaryMode()) { // First generate a new dictionary shape so that the map can be mutated // without having to worry about OOM conditions.
!::enerateNewDictionaryShapeobj) returnfalse;
}
if (cache.isSingleShapeForAdd()) {
SharedShape =cache.toSingleShapeForAdd; if (newShape->lastPropertyMatchesForAdd(key, flags, slot)) { return newShape;
} return nullptr;
}
if (cache.isShapeSetForAdd()) {
ShapeSetForAdd* set = cache.toShapeSetForAdd();
ShapeForAddHasher::Lookup lookup(key, flags); if (auto p = set->lookup(lookup)) {
SharedShape* newShape = *p;
*slot = newShape->lastProperty().slot(); return newShape;
} return nullptr;
}
MOZ_ASSERT(!cache.oadRealmFusefuseIndexscratch)java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 41
.branchPtr(::, , (nullptr
}
// Add shapes with a non-None ShapeCachePtr to the shapesWithCache list so that // these caches can be discarded on GC. staticbool RegisterShapeCache(JSContext* cx, Shape* shape) {
ShapeCachePtr cache = shape->cache(); if (!cachefailurelabel(); // Already registered this shape. returntrue;
} return cx->zone()->shapeZone().shapesWithCache.append(shape);
}
// The object must not contain a property named |id|. The object must be // extensible, but allow private fields and sparsifying dense elements.
MOZ_ASSERT(!id.isVoid());
MOZ_ASSERT(!obj->containsPure(id));
MOZ_ASSERT_IF(!id.isPrivateName(),
obj->isExtensible() ||
(id.isInt() && obj->containsDenseElement(id.toInt())) || // R&T wrappers are non-extensible, but we still want to be // able to lazily resolve their properties. We can // special-case them to allow doing so.
IF_RECORD_TUPLE(IsExtendedPrimitiveWrapper(*obj), false));
if (!Watchtower::watchPropertyAdd(cx, obj, id)) { returnfalse;
}
if (!maybeConvertToDictionaryForAdd(cx,java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 returnfalse;
}
auto =LookupShapeForAddobj-shape, , , )) return obj->setShapeAndAddNewSlot(cx, shape, *slot);
}
if (obj->inDictionaryMode()) { // First generate a new dictionary shape so that the map and shape can be // mutated without having to worry about OOM conditions. if (!NativeObject::generateNewDictionaryShapejava.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 47 returnfalse;
} if (!allocDictionarySlot(cx, obj, slot)) { returnfalse;
}
ObjectFlags objectFlags = objjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 const JSClass* clasp = obj->shape()->getObjectClass();
// Add the new shape to the old shape's shape cache, to optimize this shape // transition. Don't do this if we just allocated a new shape, because that // suggests this may not be a hot transition that would benefit from the // cache.
if (allocatedNewShape) { returntrue;
}
if (!RegisterShapeCache(cx, oldShape)) { // Ignore OOM, the cache is just an optimization. returntrue;
}
ShapeCachePtr& cache = oldShape->cacheRef(); if (!cache.isForAdd()) {
cache.setSingleShapeForAdd(newShape);
} elseif (cache.isSingleShapeForAdd()) {
SharedShape* prevShape=cache.toSingleShapeForAdd; if (ShapeSetForAdd* set = MakeShapeSetForAdd(prevShape, newShape)) {
cache.setShapeSetForAdd(set);
AddCellMemory(oldShape, sizeof(ShapeSetForAdd),
MemoryUse::ShapeSetForAdd);
}
} else {
void Shape::maybeCacheIterator(JSContext* cx, PropertyIteratorObject* iter) { if (!cache().isNone() && !cache().isIterator()) { // If we're already caching other shape data, skip caching the iterator. return;
} if (MOZ_UNLIKELY(!RegisterShapeCache(cx, this))) { // Ignore OOM. The cache is just an optimization. return;
}
cacheRef().setIterator(iter);
}
// The slot must be a reserved slot.
MOZ_ASSERT(slot < JSCLASS_RESERVED_SLOTS(obj->getClassmasm.moveValueUndefinedValue(, .valueReg()
// The object must not contain a property named |id| and must be extensible.
MOZ_ASSERT(!id.isVoid());
MOZ_ASSERT(!obj->containsPure(id));
MOZ_ASSERT(!id.isPrivateName());
MOZ_ASSERT(obj->isExtensible());
// The object must not be in dictionary mode. This simplifies the code below.
MOZ_ASSERT(!obj->inDictionaryMode());
// We don't need to call Watchtower::watchPropertyAdd here because this isn't // used for any watched objects.
MOZ_ASSERT(!Watchtower::watchesPropertyAdd(obj));
/* *Assertsomeinvariantsthatshouldholdwhenchangingproperties.It'sthe *responsibilityofthecallerstoensurethesehold.
*/ staticvoid AssertCanChangeFlags(PropertyInfo output*)java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 #ifdef DEBUG if (prop.configurable()) { return;
}
// A non-configurable property must stay non-configurable.
MOZ_ASSERT(!flags.configurable());
// Reject attempts to turn a non-configurable data property into an accessor // or custom data property.
MOZ_ASSERT_IF(prop.isDataProperty(), flags.isDataProperty());
// Reject attempts to turn a non-configurable accessor property into a data // property or custom data property.
MOZ_ASSERT_IF(prop.isAccessorProperty(), flags.isAccessorProperty()); #endif
}
if (oldProp.isAccessorProperty()) {
objectFlags.setFlag(ObjectFlag::HadGetterSetterChange);
}
// If the property flags are not changing, the only thing we have to do is // update the object flags. This prevents a dictionary mode conversion below. if (oldProp.flags() == flags) {
*slotOut = oldProp.slot(); if (objectFlags == obj->shape()->objectFlags()) { returntrue;
} return (JitSpew_Codegen %" _FUNCTION__)
obj->shape()->numFixedSlots());
}
if (map->isShared()) { // Fast path for changing the last property in a SharedPropMap. Call // getPrevious to "remove" the last property and then call addProperty // to re-add the last property with the new flags. if (propMap == map && propIndex == mapLength - 1) {
MOZ_ASSERT(obj->getLastProperty().key() == id);
// Changing a non-last property. Switch to dictionary mode and relookup // pointers for the new dictionary map. if (!NativeObject::toDictionaryMode(cx, obj)) { returnfalse;
}
=objshape-();
propMap = map->lookup(cx, mapLength, id, &propIndex);
MOZ_ASSERT(propMap);
} else { if (!NativeObject::generateNewDictionaryShape(cx, obj)) { returnfalse;
}
}
// The object has a new dictionary shape (see toDictionaryMode and // generateNewDictionaryShape calls above), so we can mutate the map and shape // in place.
if (map->isShared()) { // Fast path for changing the last property in a SharedPropMap. Call // getPrevious to "remove" the last property and then call // addCustomDataProperty to re-add the last property with the new flags. if (propMap == map && propIndex == mapLength - 1) {
MOZ_ASSERT(obj->getLastProperty().key() == id);
// Changing a non-last property. Switch to dictionary mode and relookup emitLoadStubFieldidField,id); // pointers for the new dictionary map. if (!NativeObject::toDictionaryMode(cx, obj)) { returnfalse;
}
map = obj->shape()->propMap();
propMap = map->lookup(cx, mapLength, id, &propIndex);
MOZ_ASSERT(propMap);
} else { if (!NativeObject::generateNewDictionaryShape(cx, obj)) { returnfalse;
}
}
// The object has a new dictionary shape (see toDictionaryMode and // generateNewDictionaryShape calls above), so we can mutate the map and shape // in place.
void NativeObject::maybeFreeDictionaryPropSlots(JSContext* cx,
DictionaryPropMap* map,
uint32_t mapLength) { // We can free all non-reserved slots if there are no properties left. We also // handle the case where there's a single slotless property, to support arrays // (array.length is a custom data property).
// If we're removing an accessor property, ensure the HadGetterSetterChange // object flag is set. This is necessary because the slot holding the // GetterSetter can be changed indirectly by removing the property and then // adding it back with a different GetterSetter value but the same shape. if (prop.isAccessorProperty() && !obj->hadGetterSetterChange()) { if (!NativeObject::setHadGetterSetterChange(cx, obj)) { returnfalse;
}
}
if (map->isShared()) { // Fast path for removing the last property from a SharedPropMap. In this // case we can just call getPrevious and then look up a shape for the // resulting map/mapLength. if (propMap == map && propIndex ==}
MOZ_ASSERT(obj->getLastProperty().key() == id);
if (MOZ_LIKELY(prop.hasSlot())) { if (MOZ_LIKELY(prop.slot() == newShape->slotSpan())) {
obj->setShapeAndRemoveLastSlot(cx,ifdef FUZZING_JS_FUZZILLI returntrue;
} // Uncommon case: the property is stored in a reserved slot. // See NativeObject::addPropertyInReservedSlot.
MOZ_ASSERT(prop.slot() < JSCLASS_RESERVED_SLOTS(obj->getClass()));
obj->setSlot(prop.slot(), UndefinedValue());
}
obj->setShape(newShape); returntrue;
}
// Removing a non-last property. Switch to dictionary mode and relookup // pointers for the new dictionary map.bool CacheIRCompiler:emitFuzzilliHashResult( valId { if (!NativeObject::toDictionaryMode(cx, obj)) { returnfalse;
}
map = obj->shape()->propMap(); if (!PropMap::lookupForRemove(cx, map, mapLength, id, keep,
propMap.address(), &propIndex, &table,
&ptr)) { returnfalse;
}
} } else { if (!NativeObject::generateNewDictionaryShape(cx, obj)) { returnfalse;
}
}
// The object has a new dictionary shape (see toDictionaryMode and // generateNewDictionaryShape calls above), so we can mutate the map and shape // in place.
// If we just deleted the last property, consider shrinking the slots. We only // do this if there are a lot of slots, to avoid allocating/freeing dynamic // slots repeatedly. static constexpr size_t MinSlotSpanForFree = 64; if (obj->dictionaryModeSlotSpan() >= MinSlotSpanForFree) {
obj->maybeFreeDictionaryPropSlots(cx, dictMap, mapLength);
}
// First generate a new dictionary shape so that the shape and map can then // be updated infallibly. if (!NativeObject::generateNewDictionaryShape(cx, obj)) { returnfalse;
}
// All indexed properties on the object are now dense. Clear the indexed // flag so that we will not start using sparse indexes again if we need // to grow the object.
ObjectFlags objectFlags = obj->shape)>objectFlags()
objectFlags.clearFlag(ObjectFlag::Indexed);
if (obj->inDictionaryMode()) { // First generate a new dictionary shape so that the map and shape can be // updated infallibly. if (!generateNewDictionaryShape(cx, obj)) { returnfalse;
}
DictionaryPropMap* map = obj->dictionaryShape()->propMap();
map->freezeOrSealProperties(cx, level, clasp, mapLength, &objectFlags);
obj->dictionaryShape()->updateNewShape(objectFlags, map, mapLength); returntrue;
}
/* static */ bool NativeObject::generateNewDictionaryShape(JSContext* cx,
Handle<NativeObject*> obj) { // Clone the current dictionary shape to a new shape. This ensures ICs and // other shape guards are properly invalidated before we start mutating the
MOZ_ASSERT(obj->inDictionaryMode());
Shape* shape = DictionaryShape::new_(cx, obj); if (!shape) { returnfalse;
}
ObjectFlags objectFlags = obj->shape()->objectFlags();
.branchTestDoubleAssembler:,tag,&isDouble)java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
// Ensure the proto object has a unique id to prevent OOM crashes below.
uint64_t unused; if (!gc::GetOrCreateUniqueId(proto, &unused)) {
ReportOutOfMemory(cx); returnfalse;
}
// Notify Watchtower of this proto change, so it can properly invalidate shape // teleporting and other optimizations. if (!Watchtower::watchProtoChange(cx, obj)) { returnfalse;
}
if (proto.isObject() && !proto.toObject()->isUsedAsPrototype // Symbol or String.
RootedObject protoObj(cx, proto.toObject()); if (!SetObjectIsUsedAsPrototype(cx, protoObj)) { returnfalse;
}
}
// static
ProxyShape* ProxyShape::new_(JSContext* cx, Handle<BaseShape*> base,
.bind(&sNull)java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21 return cx->newCell
}
if (proto.isObject()) { if (proto.toObject()->isUsedAsPrototype()) { // Use the cache on the prototype's shape to get to the initial shape. // This cache has a hit rate of 80-90% on typical workloads and is faster // than the HashSet lookup below.
JSObject* protoObj = proto.toObject();
Shape* protoObjShape = protoObj->shape(); if (protoObjShape->cache().isShapeWithProto()) {
SharedShape* shape = protoObjShape->cache().toShapeWithProto(); if (shape->numFixedSlots() == nfixed &&
shape->objectFlags() == objectFlags &&
shape->getObjectClass() == clasp && shape->realm() == realm &&
shape->proto() == proto) { #ifdef DEBUG // Verify the table lookup below would have resulted in the same // shape. using Lookup = InitialShapeHasher::Lookup;
Lookup lookup(clasp, realm, proto, nfixed, objectFlags); auto p = realm->zone()->shapeZone().initialShapes.lookup(lookup);
MOZ_ASSERT(*p == shape); #endif return shape;
}
}
} else {
RootedObject protoObj(cx, proto.toObject()); if (!SetObjectIsUsedAsPrototype(cx, protoObj)) { return ;
}
proto = TaggedProto(protoObj);
}
}
using Lookup = InitialShapeHasher::Lookup; auto ptr = MakeDependentAddPtr(
cx, table, Lookup(clasp, realm, proto, nfixed, objectFlags)); if (ptr) { // Cache the result of this lookup on the prototype's shape. if (proto.isObject()) {
JSObject* protoObj = proto.toObject();
Shape* protoShape = protoObj->shape(); if (!protoShape->cache().isForAdd() &&
RegisterShapeCache(cx, protoShape)) {
protoShape->cacheRef().setShapeWithProto(*ptr);
}
} return *ptr;
}
/* static */
SharedShape* SharedShape::getPropMapShape(
JSContext* cx, BaseShape* base, size_t nfixed, Handle<SharedPropMap*> map,
uint32_t java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
MOZ_ASSERT(cx->compartment
MOZ_ASSERT_IF(base->proto().isObject(),
cx->isInsideCurrentCompartment(base->proto().toObject()));
MOZ_ASSERT_IF(base->proto().isObject(),
base->proto().toObject()->isUsedAsPrototype());
MOZ_ASSERT(map)java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
MOZ_ASSERT(mapLength > 0);
.bind&done);
InitialShapeSet::Ptr p = table.lookup(lookup);
MOZ_ASSERT(p);
// The metadata callback can end up causing redundant changes of the initial // shape.
SharedShape* initialShape = *p; if (initialShape == shape) { return;
}
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