FiltrationResult AbstractValue::filter(Graph& graph, const StructureSet& other)
{
if (isClear())
return FiltrationOK;
// FIXME: This could be optimized for the common case of m_type not
// having structures, array modes, or a specific value.
// https://bugs.webkit.org/show_bug.cgi?id=109663
m_type &= other.speculationFromStructures();
m_arrayModes &= other.arrayModesFromStructures();
m_currentKnownStructure.filter(other);
// It's possible that prior to the above two statements we had (Foo, TOP), where
// Foo is a SpeculatedType that is disjoint with the passed StructureSet. In that
// case, we will now have (None, [someStructure]). In general, we need to make
// sure that new information gleaned from the SpeculatedType needs to be fed back
// into the information gleaned from the StructureSet.
m_currentKnownStructure.filter(m_type);
if (m_currentKnownStructure.hasSingleton())
setFuturePossibleStructure(graph, m_currentKnownStructure.singleton());
filterArrayModesByType();
filterValueByType();
return normalizeClarity();
}
void AbstractValue::set(Graph& graph, Structure* structure)
{
m_currentKnownStructure = structure;
setFuturePossibleStructure(graph, structure);
m_arrayModes = asArrayModes(structure->indexingType());
m_type = speculationFromStructure(structure);
m_value = JSValue();
checkConsistency();
}
void AbstractValue::setMostSpecific(Graph& graph, JSValue value)
{
if (!!value && value.isCell()) {
Structure* structure = value.asCell()->structure();
m_currentKnownStructure = structure;
setFuturePossibleStructure(graph, structure);
m_arrayModes = asArrayModes(structure->indexingType());
} else {
m_currentKnownStructure.clear();
m_futurePossibleStructure.clear();
m_arrayModes = 0;
}
m_type = speculationFromValue(value);
m_value = value;
checkConsistency();
}
void AbstractValue::set(Graph& graph, JSValue value)
{
if (!!value && value.isCell()) {
m_currentKnownStructure.makeTop();
Structure* structure = value.asCell()->structure();
setFuturePossibleStructure(graph, structure);
m_arrayModes = asArrayModes(structure->indexingType());
clobberArrayModes();
} else {
m_currentKnownStructure.clear();
m_futurePossibleStructure.clear();
m_arrayModes = 0;
}
m_type = speculationFromValue(value);
if (m_type == SpecInt52AsDouble)
m_type = SpecInt52;
m_value = value;
checkConsistency();
}
