mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
b424446c5f
If ever you want to separate building analysis from scanning/parsing/ast, this will help.
116 lines
3.5 KiB
C++
116 lines
3.5 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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#include <libsolidity/analysis/PostTypeChecker.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/interface/Version.h>
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#include <liblangutil/ErrorReporter.h>
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#include <liblangutil/SemVerHandler.h>
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#include <libdevcore/Algorithms.h>
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#include <boost/range/adaptor/map.hpp>
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#include <memory>
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using namespace std;
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using namespace dev;
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using namespace langutil;
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using namespace dev::solidity;
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bool PostTypeChecker::check(ASTNode const& _astRoot)
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{
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_astRoot.accept(*this);
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return Error::containsOnlyWarnings(m_errorReporter.errors());
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}
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bool PostTypeChecker::visit(ContractDefinition const&)
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{
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solAssert(!m_currentConstVariable, "");
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solAssert(m_constVariableDependencies.empty(), "");
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return true;
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}
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void PostTypeChecker::endVisit(ContractDefinition const&)
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{
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solAssert(!m_currentConstVariable, "");
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for (auto declaration: m_constVariables)
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if (auto identifier = findCycle(*declaration))
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m_errorReporter.typeError(
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declaration->location(),
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"The value of the constant " + declaration->name() +
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" has a cyclic dependency via " + identifier->name() + "."
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);
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m_constVariables.clear();
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m_constVariableDependencies.clear();
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}
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bool PostTypeChecker::visit(VariableDeclaration const& _variable)
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{
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solAssert(!m_currentConstVariable, "");
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if (_variable.isConstant())
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{
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m_currentConstVariable = &_variable;
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m_constVariables.push_back(&_variable);
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}
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return true;
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}
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void PostTypeChecker::endVisit(VariableDeclaration const& _variable)
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{
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if (_variable.isConstant())
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{
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solAssert(m_currentConstVariable == &_variable, "");
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m_currentConstVariable = nullptr;
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}
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}
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bool PostTypeChecker::visit(Identifier const& _identifier)
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{
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if (m_currentConstVariable)
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if (auto var = dynamic_cast<VariableDeclaration const*>(_identifier.annotation().referencedDeclaration))
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if (var->isConstant())
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m_constVariableDependencies[m_currentConstVariable].insert(var);
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return true;
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}
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VariableDeclaration const* PostTypeChecker::findCycle(VariableDeclaration const& _startingFrom)
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{
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auto visitor = [&](VariableDeclaration const& _variable, CycleDetector<VariableDeclaration>& _cycleDetector, size_t _depth)
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{
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if (_depth >= 256)
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m_errorReporter.fatalDeclarationError(_variable.location(), "Variable definition exhausting cyclic dependency validator.");
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// Iterating through the dependencies needs to be deterministic and thus cannot
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// depend on the memory layout.
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// Because of that, we sort by AST node id.
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vector<VariableDeclaration const*> dependencies(
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m_constVariableDependencies[&_variable].begin(),
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m_constVariableDependencies[&_variable].end()
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);
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sort(dependencies.begin(), dependencies.end(), [](VariableDeclaration const* _a, VariableDeclaration const* _b) -> bool
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{
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return _a->id() < _b->id();
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});
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for (auto v: dependencies)
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if (_cycleDetector.run(*v))
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return;
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};
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return CycleDetector<VariableDeclaration>(visitor).run(_startingFrom);
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}
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