Value
SnapshotIterator::slotValue(const Slot &slot)
{
switch (slot.mode()) {
case SnapshotReader::DOUBLE_REG:
return DoubleValue(machine_.read(slot.floatReg()));
case SnapshotReader::TYPED_REG:
return FromTypedPayload(slot.knownType(), machine_.read(slot.reg()));
case SnapshotReader::TYPED_STACK:
{
JSValueType type = slot.knownType();
if (type == JSVAL_TYPE_DOUBLE)
return DoubleValue(ReadFrameDoubleSlot(fp_, slot.stackSlot()));
return FromTypedPayload(type, ReadFrameSlot(fp_, slot.stackSlot()));
}
case SnapshotReader::UNTYPED:
{
jsval_layout layout;
#if defined(JS_NUNBOX32)
layout.s.tag = (JSValueTag)fromLocation(slot.type());
layout.s.payload.word = fromLocation(slot.payload());
#elif defined(JS_PUNBOX64)
layout.asBits = fromLocation(slot.value());
#endif
return IMPL_TO_JSVAL(layout);
}
case SnapshotReader::JS_UNDEFINED:
return UndefinedValue();
case SnapshotReader::JS_NULL:
return NullValue();
case SnapshotReader::JS_INT32:
return Int32Value(slot.int32Value());
case SnapshotReader::CONSTANT:
return ionScript_->getConstant(slot.constantIndex());
default:
JS_NOT_REACHED("huh?");
return UndefinedValue();
}
}
bool
SnapshotIterator::slotReadable(const Slot &slot)
{
switch (slot.mode()) {
case SnapshotReader::DOUBLE_REG:
return machine_.has(slot.floatReg());
case SnapshotReader::TYPED_REG:
return machine_.has(slot.reg());
case SnapshotReader::UNTYPED:
#if defined(JS_NUNBOX32)
return hasLocation(slot.type()) && hasLocation(slot.payload());
#elif defined(JS_PUNBOX64)
return hasLocation(slot.value());
#endif
default:
return true;
}
}