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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2015
* Evaluator for types of constant expressions.
*/
#include <libsolidity/analysis/ConstantEvaluator.h>
#include <libsolidity/ast/AST.h>
#include <libsolidity/interface/ErrorReporter.h>
using namespace std;
using namespace dev;
using namespace dev::solidity;
void ConstantEvaluator::endVisit(UnaryOperation const& _operation)
{
auto sub = type(_operation.subExpression());
if (sub)
setType(_operation, sub->unaryOperatorResult(_operation.getOperator()));
}
void ConstantEvaluator::endVisit(BinaryOperation const& _operation)
{
auto left = type(_operation.leftExpression());
auto right = type(_operation.rightExpression());
if (left && right)
{
auto commonType = left->binaryOperatorResult(_operation.getOperator(), right);
if (!commonType)
m_errorReporter.fatalTypeError(
_operation.location(),
"Operator " +
string(Token::toString(_operation.getOperator())) +
" not compatible with types " +
left->toString() +
" and " +
right->toString()
);
setType(
_operation,
Token::isCompareOp(_operation.getOperator()) ?
make_shared<BoolType>() :
commonType
);
}
}
void ConstantEvaluator::endVisit(Literal const& _literal)
{
setType(_literal, Type::forLiteral(_literal));
}
void ConstantEvaluator::endVisit(Identifier const& _identifier)
{
VariableDeclaration const* variableDeclaration = dynamic_cast<VariableDeclaration const*>(_identifier.annotation().referencedDeclaration);
if (!variableDeclaration)
return;
if (!variableDeclaration->isConstant())
return;
ASTPointer<Expression> const& value = variableDeclaration->value();
if (!value)
return;
else if (!m_types->count(value.get()))
{
if (m_depth > 32)
m_errorReporter.fatalTypeError(_identifier.location(), "Cyclic constant definition (or maximum recursion depth exhausted).");
ConstantEvaluator(m_errorReporter, m_depth + 1, m_types).evaluate(*value);
}
setType(_identifier, type(*value));
}
void ConstantEvaluator::setType(ASTNode const& _node, TypePointer const& _type)
{
if (_type && _type->category() == Type::Category::RationalNumber)
(*m_types)[&_node] = _type;
}
TypePointer ConstantEvaluator::type(ASTNode const& _node)
{
return (*m_types)[&_node];
}
TypePointer ConstantEvaluator::evaluate(Expression const& _expr)
{
_expr.accept(*this);
return type(_expr);
}
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