void Structure::materializePropertyMap(VM& vm)
{
ASSERT(structure()->classInfo() == info());
ASSERT(!propertyTable());
Vector<Structure*, 8> structures;
Structure* structure;
PropertyTable* table;
findStructuresAndMapForMaterialization(structures, structure, table);
if (table) {
table = table->copy(vm, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity));
structure->m_lock.unlock();
}
// Must hold the lock on this structure, since we will be modifying this structure's
// property map. We don't want getConcurrently() to see the property map in a half-baked
// state.
GCSafeConcurrentJITLocker locker(m_lock, vm.heap);
if (!table)
createPropertyMap(locker, vm, numberOfSlotsForLastOffset(m_offset, m_inlineCapacity));
else
propertyTable().set(vm, this, table);
for (size_t i = structures.size(); i--;) {
structure = structures[i];
if (!structure->m_nameInPrevious)
continue;
PropertyMapEntry entry(structure->m_nameInPrevious.get(), structure->m_offset, structure->attributesInPrevious());
propertyTable()->add(entry, m_offset, PropertyTable::PropertyOffsetMustNotChange);
}
checkOffsetConsistency();
}
void PropertyTable::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
PropertyTable* thisObject = jsCast<PropertyTable*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
JSCell::visitChildren(thisObject, visitor);
PropertyTable::iterator end = thisObject->end();
for (PropertyTable::iterator ptr = thisObject->begin(); ptr != end; ++ptr)
visitor.append(&ptr->specificValue);
}
PropertyTable::PropertyTable(const PropertyTable &other)
:
QObject()
{
// Reparent.
setParent(other.parent());
// We just copy one container from another.
m_properties = other.m_properties;
}
PropertyTable::PropertyTable(VM& vm, unsigned initialCapacity, const PropertyTable& other)
: JSCell(vm, vm.propertyTableStructure.get())
, m_indexSize(sizeForCapacity(initialCapacity))
, m_indexMask(m_indexSize - 1)
, m_index(static_cast<unsigned*>(fastZeroedMalloc(dataSize())))
, m_keyCount(0)
, m_deletedCount(0)
{
ASSERT(isPowerOf2(m_indexSize));
ASSERT(initialCapacity >= other.m_keyCount);
const_iterator end = other.end();
for (const_iterator iter = other.begin(); iter != end; ++iter) {
ASSERT(canInsert());
reinsert(*iter);
iter->key->ref();
}
// Copy the m_deletedOffsets vector.
Vector<PropertyOffset>* otherDeletedOffsets = other.m_deletedOffsets.get();
if (otherDeletedOffsets)
m_deletedOffsets = std::make_unique<Vector<PropertyOffset>>(*otherDeletedOffsets);
}
void Structure::willStoreValueSlow(
VM& vm, PropertyName propertyName, JSValue value, bool shouldOptimize,
InferredTypeTable::StoredPropertyAge age)
{
ASSERT(!isCompilationThread());
ASSERT(structure()->classInfo() == info());
ASSERT(!hasBeenDictionary());
// Create the inferred type table before doing anything else, so that we don't GC after we have already
// grabbed a pointer into the property map.
InferredTypeTable* table = m_inferredTypeTable.get();
if (!table) {
table = InferredTypeTable::create(vm);
WTF::storeStoreFence();
m_inferredTypeTable.set(vm, this, table);
}
// This only works if we've got a property table.
PropertyTable* propertyTable;
materializePropertyMapIfNecessary(vm, propertyTable);
// We must be calling this after having created the given property or confirmed that it was present
// already, so we must have a property table now.
ASSERT(propertyTable);
// ... and the property must be present.
PropertyMapEntry* entry = propertyTable->get(propertyName.uid());
ASSERT(entry);
if (shouldOptimize)
entry->hasInferredType = table->willStoreValue(vm, propertyName, value, age);
else {
table->makeTop(vm, propertyName, age);
entry->hasInferredType = false;
}
}
PropertyTable* PropertyTable::clone(VM& vm, JSCell* owner, unsigned initialCapacity, const PropertyTable& other)
{
PropertyTable* table = new (NotNull, allocateCell<PropertyTable>(vm.heap)) PropertyTable(vm, owner, initialCapacity, other);
table->finishCreation(vm);
return table;
}
PropertyTable* PropertyTable::create(VM& vm, unsigned initialCapacity)
{
PropertyTable* table = new (NotNull, allocateCell<PropertyTable>(vm.heap)) PropertyTable(vm, initialCapacity);
table->finishCreation(vm);
return table;
}
PropertyTable* PropertyTable::clone(VM& vm, const PropertyTable& other)
{
PropertyTable* table = new (NotNull, allocateCell<PropertyTable>(vm.heap)) PropertyTable(vm, other);
table->finishCreation(vm);
return table;
}