bool Why3Translator::visit(ContractDefinition const& _contract)
{
if (m_seenContract)
error(_contract, "More than one contract not supported.");
m_seenContract = true;
m_currentContract.contract = &_contract;
if (_contract.isLibrary())
error(_contract, "Libraries not supported.");
addLine("module Contract_" + _contract.name());
indent();
addLine("use import int.Int");
addLine("use import ref.Ref");
addLine("use import map.Map");
addLine("use import array.Array");
addLine("use import int.ComputerDivision");
addLine("use import mach.int.Unsigned");
addLine("use import UInt256");
addLine("exception Revert");
addLine("exception Return");
if (_contract.stateVariables().empty())
addLine("type state = ()");
else
{
addLine("type state = {");
indent();
m_currentContract.stateVariables = _contract.stateVariables();
for (VariableDeclaration const* variable: m_currentContract.stateVariables)
{
string varType;
try
{
varType = toFormalType(*variable->annotation().type);
}
catch (NoFormalType &err)
{
string const* typeNamePtr = boost::get_error_info<errinfo_noFormalTypeFrom>(err);
string typeName = typeNamePtr ? " \"" + *typeNamePtr + "\"" : "";
fatalError(*variable, "Type" + typeName + " not supported for state variable.");
}
addLine("mutable _" + variable->name() + ": " + varType);
}
unindent();
addLine("}");
}
addLine("type account = {");
indent();
addLine("mutable balance: uint256;");
addLine("storage: state");
unindent();
addLine("}");
addLine("val external_call (this: account): bool");
indent();
addLine("ensures { result = false -> this = (old this) }");
addLine("writes { this }");
addSourceFromDocStrings(m_currentContract.contract->annotation());
unindent();
if (!_contract.baseContracts().empty())
error(*_contract.baseContracts().front(), "Inheritance not supported.");
if (!_contract.definedStructs().empty())
error(*_contract.definedStructs().front(), "User-defined types not supported.");
if (!_contract.definedEnums().empty())
error(*_contract.definedEnums().front(), "User-defined types not supported.");
if (!_contract.events().empty())
error(*_contract.events().front(), "Events not supported.");
if (!_contract.functionModifiers().empty())
error(*_contract.functionModifiers().front(), "Modifiers not supported.");
ASTNode::listAccept(_contract.definedFunctions(), *this);
return false;
}
