void ArrayProfile::computeUpdatedPrediction(const ConcurrentJITLocker&, CodeBlock* codeBlock, Structure* lastSeenStructure)
{
m_observedArrayModes |= arrayModeFromStructure(lastSeenStructure);
if (!m_didPerformFirstRunPruning
&& hasTwoOrMoreBitsSet(m_observedArrayModes)) {
m_observedArrayModes = arrayModeFromStructure(lastSeenStructure);
m_didPerformFirstRunPruning = true;
}
m_mayInterceptIndexedAccesses |=
lastSeenStructure->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero();
JSGlobalObject* globalObject = codeBlock->globalObject();
if (!globalObject->isOriginalArrayStructure(lastSeenStructure)
&& !globalObject->isOriginalTypedArrayStructure(lastSeenStructure))
m_usesOriginalArrayStructures = false;
}
void ArrayProfile::computeUpdatedPrediction(CodeBlock* codeBlock, OperationInProgress operation)
{
const bool verbose = false;
if (m_lastSeenStructure) {
m_observedArrayModes |= arrayModeFromStructure(m_lastSeenStructure);
m_mayInterceptIndexedAccesses |=
m_lastSeenStructure->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero();
if (!codeBlock->globalObject()->isOriginalArrayStructure(m_lastSeenStructure))
m_usesOriginalArrayStructures = false;
if (!structureIsPolymorphic()) {
if (!m_expectedStructure)
m_expectedStructure = m_lastSeenStructure;
else if (m_expectedStructure != m_lastSeenStructure) {
if (verbose)
dataLog(*codeBlock, " bc#", m_bytecodeOffset, ": making structure polymorphic because ", RawPointer(m_expectedStructure), " (", m_expectedStructure->classInfo()->className, ") != ", RawPointer(m_lastSeenStructure), " (", m_lastSeenStructure->classInfo()->className, ")\n");
m_expectedStructure = polymorphicStructure();
}
}
m_lastSeenStructure = 0;
}
if (hasTwoOrMoreBitsSet(m_observedArrayModes)) {
if (verbose)
dataLog(*codeBlock, " bc#", m_bytecodeOffset, ": making structure polymorphic because two or more bits are set in m_observedArrayModes\n");
m_expectedStructure = polymorphicStructure();
}
if (operation == Collection
&& expectedStructure()
&& !Heap::isMarked(m_expectedStructure)) {
if (verbose)
dataLog(*codeBlock, " bc#", m_bytecodeOffset, ": making structure during GC\n");
m_expectedStructure = polymorphicStructure();
}
}
