IonFrameIterator::IonFrameIterator(const IonActivationIterator &activations)
: current_(activations.top()),
type_(IonFrame_Exit),
returnAddressToFp_(NULL),
frameSize_(0),
cachedSafepointIndex_(NULL),
activation_(activations.activation())
{
}
static void
MarkIonActivation(JSTracer *trc, const IonActivationIterator &activations)
{
for (IonFrameIterator frames(activations); !frames.done(); ++frames) {
switch (frames.type()) {
case IonFrame_Exit:
MarkIonExitFrame(trc, frames);
break;
case IonFrame_JS:
MarkIonJSFrame(trc, frames);
break;
case IonFrame_Bailed_JS:
JS_NOT_REACHED("invalid");
break;
case IonFrame_Rectifier:
case IonFrame_Bailed_Rectifier: {
IonCompartment *ionCompartment = activations.activation()->compartment()->ionCompartment();
MarkIonCodeRoot(trc, ionCompartment->getArgumentsRectifierAddr(), "Arguments Rectifier");
break;
}
case IonFrame_Osr:
// The callee token will be marked by the callee JS frame;
// otherwise, it does not need to be marked, since the frame is
// dead.
break;
default:
JS_NOT_REACHED("unexpected frame type");
break;
}
}
}
IonBailoutIterator::IonBailoutIterator(const IonActivationIterator &activations,
BailoutStack *bailout)
: IonFrameIterator(activations),
machine_(bailout->machine())
{
uint8_t *sp = bailout->parentStackPointer();
uint8_t *fp = sp + bailout->frameSize();
current_ = fp;
type_ = IonFrame_OptimizedJS;
topFrameSize_ = current_ - sp;
topIonScript_ = script()->ion;
if (bailout->frameClass() == FrameSizeClass::None()) {
snapshotOffset_ = bailout->snapshotOffset();
return;
}
// Compute the snapshot offset from the bailout ID.
IonActivation *activation = activations.activation();
JSCompartment *jsCompartment = activation->compartment();
IonCompartment *ionCompartment = jsCompartment->ionCompartment();
IonCode *code = ionCompartment->getBailoutTable(bailout->frameClass());
uintptr_t tableOffset = bailout->tableOffset();
uintptr_t tableStart = reinterpret_cast<uintptr_t>(code->raw());
JS_ASSERT(tableOffset >= tableStart &&
tableOffset < tableStart + code->instructionsSize());
JS_ASSERT((tableOffset - tableStart) % BAILOUT_TABLE_ENTRY_SIZE == 0);
uint32_t bailoutId = ((tableOffset - tableStart) / BAILOUT_TABLE_ENTRY_SIZE) - 1;
JS_ASSERT(bailoutId < BAILOUT_TABLE_SIZE);
snapshotOffset_ = topIonScript_->bailoutToSnapshot(bailoutId);
}
