mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
106 lines
3.0 KiB
C++
106 lines
3.0 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2015
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* Evaluator for types of constant expressions.
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*/
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#include <libsolidity/analysis/ConstantEvaluator.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/interface/ErrorReporter.h>
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using namespace std;
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using namespace dev;
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using namespace dev::solidity;
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void ConstantEvaluator::endVisit(UnaryOperation const& _operation)
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{
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auto sub = type(_operation.subExpression());
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if (sub)
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setType(_operation, sub->unaryOperatorResult(_operation.getOperator()));
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}
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void ConstantEvaluator::endVisit(BinaryOperation const& _operation)
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{
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auto left = type(_operation.leftExpression());
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auto right = type(_operation.rightExpression());
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if (left && right)
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{
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auto commonType = left->binaryOperatorResult(_operation.getOperator(), right);
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if (!commonType)
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m_errorReporter.fatalTypeError(
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_operation.location(),
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"Operator " +
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string(Token::toString(_operation.getOperator())) +
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" not compatible with types " +
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left->toString() +
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" and " +
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right->toString()
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);
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setType(
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_operation,
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Token::isCompareOp(_operation.getOperator()) ?
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make_shared<BoolType>() :
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commonType
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);
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}
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}
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void ConstantEvaluator::endVisit(Literal const& _literal)
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{
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setType(_literal, Type::forLiteral(_literal));
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}
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void ConstantEvaluator::endVisit(Identifier const& _identifier)
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{
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VariableDeclaration const* variableDeclaration = dynamic_cast<VariableDeclaration const*>(_identifier.annotation().referencedDeclaration);
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if (!variableDeclaration)
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return;
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if (!variableDeclaration->isConstant())
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return;
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ASTPointer<Expression> const& value = variableDeclaration->value();
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if (!value)
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return;
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else if (!m_types->count(value.get()))
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{
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if (m_depth > 32)
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m_errorReporter.fatalTypeError(_identifier.location(), "Cyclic constant definition (or maximum recursion depth exhausted).");
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ConstantEvaluator(m_errorReporter, m_depth + 1, m_types).evaluate(*value);
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}
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setType(_identifier, type(*value));
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}
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void ConstantEvaluator::setType(ASTNode const& _node, TypePointer const& _type)
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{
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if (_type && _type->category() == Type::Category::RationalNumber)
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(*m_types)[&_node] = _type;
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}
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TypePointer ConstantEvaluator::type(ASTNode const& _node)
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{
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return (*m_types)[&_node];
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}
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TypePointer ConstantEvaluator::evaluate(Expression const& _expr)
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{
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_expr.accept(*this);
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return type(_expr);
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}
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