KnownState::StoreOperation KnownState::feedItem(AssemblyItem const& _item, bool _copyItem)
{
StoreOperation op;
if (_item.type() == Tag)
{
// can be ignored
}
else if (_item.type() != Operation)
{
assertThrow(_item.deposit() == 1, InvalidDeposit, "");
if (_item.pushedValue())
// only available after assembly stage, should not be used for optimisation
setStackElement(++m_stackHeight, m_expressionClasses->find(*_item.pushedValue()));
else
setStackElement(++m_stackHeight, m_expressionClasses->find(_item, {}, _copyItem));
}
else
{
Instruction instruction = _item.instruction();
InstructionInfo info = instructionInfo(instruction);
if (SemanticInformation::isDupInstruction(_item))
setStackElement(
m_stackHeight + 1,
stackElement(
m_stackHeight - int(instruction) + int(Instruction::DUP1),
_item.getLocation()
)
);
else if (SemanticInformation::isSwapInstruction(_item))
swapStackElements(
m_stackHeight,
m_stackHeight - 1 - int(instruction) + int(Instruction::SWAP1),
_item.getLocation()
);
else if (instruction != Instruction::POP)
{
vector<Id> arguments(info.args);
for (int i = 0; i < info.args; ++i)
arguments[i] = stackElement(m_stackHeight - i, _item.getLocation());
if (_item.instruction() == Instruction::SSTORE)
op = storeInStorage(arguments[0], arguments[1], _item.getLocation());
else if (_item.instruction() == Instruction::SLOAD)
setStackElement(
m_stackHeight + _item.deposit(),
loadFromStorage(arguments[0], _item.getLocation())
);
else if (_item.instruction() == Instruction::MSTORE)
op = storeInMemory(arguments[0], arguments[1], _item.getLocation());
else if (_item.instruction() == Instruction::MLOAD)
setStackElement(
m_stackHeight + _item.deposit(),
loadFromMemory(arguments[0], _item.getLocation())
);
else if (_item.instruction() == Instruction::SHA3)
setStackElement(
m_stackHeight + _item.deposit(),
applySha3(arguments.at(0), arguments.at(1), _item.getLocation())
);
else
{
if (SemanticInformation::invalidatesMemory(_item.instruction()))
resetMemory();
if (SemanticInformation::invalidatesStorage(_item.instruction()))
resetStorage();
assertThrow(info.ret <= 1, InvalidDeposit, "");
if (info.ret == 1)
setStackElement(
m_stackHeight + _item.deposit(),
m_expressionClasses->find(_item, arguments, _copyItem)
);
}
}
m_stackElements.erase(
m_stackElements.upper_bound(m_stackHeight + _item.deposit()),
m_stackElements.end()
);
m_stackHeight += _item.deposit();
}
return op;
}
