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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 Federico Bond <federicobond@gmail.com>
* @date 2016
* Static analyzer and checker.
*/
#pragma once
#include <libsolidity/analysis/TypeChecker.h>
#include <libsolidity/ast/Types.h>
#include <libsolidity/ast/ASTAnnotations.h>
#include <libsolidity/ast/ASTForward.h>
#include <libsolidity/ast/ASTVisitor.h>
namespace dev
{
namespace solidity
{
/**
* The module that performs static analysis on the AST.
* In this context, static analysis is anything that can produce warnings which can help
* programmers write cleaner code. For every warning generated here, it has to be possible to write
* equivalent code that does not generate the warning.
*/
class StaticAnalyzer: private ASTConstVisitor
{
public:
/// @param _errorReporter provides the error logging functionality.
explicit StaticAnalyzer(ErrorReporter& _errorReporter): m_errorReporter(_errorReporter) {}
/// Performs static analysis on the given source unit and all of its sub-nodes.
/// @returns true iff all checks passed. Note even if all checks passed, errors() can still contain warnings
bool analyze(SourceUnit const& _sourceUnit);
private:
bool visit(ContractDefinition const& _contract) override;
void endVisit(ContractDefinition const& _contract) override;
bool visit(FunctionDefinition const& _function) override;
void endVisit(FunctionDefinition const& _function) override;
bool visit(ExpressionStatement const& _statement) override;
bool visit(VariableDeclaration const& _variable) override;
bool visit(Identifier const& _identifier) override;
bool visit(Return const& _return) override;
bool visit(MemberAccess const& _memberAccess) override;
bool visit(InlineAssembly const& _inlineAssembly) override;
bool visit(BinaryOperation const& _operation) override;
bool visit(FunctionCall const& _functionCall) override;
/// @returns the size of this type in storage, including all sub-types.
static bigint structureSizeEstimate(Type const& _type, std::set<StructDefinition const*>& _structsSeen);
ErrorReporter& m_errorReporter;
/// Flag that indicates whether the current contract definition is a library.
bool m_library = false;
/// Number of uses of each (named) local variable in a function, counter is initialized with zero.
/// Pairs of AST ids and pointers are used as keys to ensure a deterministic order
/// when traversing.
std::map<std::pair<size_t, VariableDeclaration const*>, int> m_localVarUseCount;
FunctionDefinition const* m_currentFunction = nullptr;
/// Flag that indicates a constructor.
bool m_constructor = false;
/// Current contract.
ContractDefinition const* m_currentContract = nullptr;
};
}
}
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