mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
116 lines
5.2 KiB
C++
116 lines
5.2 KiB
C++
/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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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cpp-ethereum 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 cpp-ethereum. 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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* Type analyzer and checker.
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*/
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#pragma once
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#include <libsolidity/TypeChecker.h>
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#include <libsolidity/Types.h>
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#include <libsolidity/ASTAnnotations.h>
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#include <libsolidity/ASTForward.h>
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#include <libsolidity/ASTVisitor.h>
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namespace dev
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{
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namespace solidity
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{
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/**
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* The module that performs type analysis on the AST, checks the applicability of operations on
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* those types and stores errors for invalid operations.
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* Provides a way to retrieve the type of an AST node.
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*/
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class TypeChecker: private ASTConstVisitor
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{
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public:
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/// Performs type checking on the given contract and all of its sub-nodes.
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/// @returns true iff all checks passed. Note even if all checks passed, errors() can still contain warnings
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bool checkTypeRequirements(ContractDefinition const& _contract);
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/// @returns the list of errors and warnings found during type checking.
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std::vector<std::shared_ptr<Error const>> const& errors() const { return m_errors; }
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/// @returns the type of an expression and asserts that it is present.
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TypePointer const& type(Expression const& _expression) const;
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/// @returns the type of the given variable and throws if the type is not present
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/// (this can happen for variables with non-explicit types before their types are resolved)
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TypePointer const& type(VariableDeclaration const& _variable) const;
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/// Adds a new error to the list of errors.
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void typeError(ASTNode const& _node, std::string const& _description);
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/// Adds a new error to the list of errors and throws to abort type checking.
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void fatalTypeError(ASTNode const& _node, std::string const& _description);
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private:
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virtual bool visit(ContractDefinition const& _contract) override;
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/// Checks that two functions defined in this contract with the same name have different
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/// arguments and that there is at most one constructor.
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void checkContractDuplicateFunctions(ContractDefinition const& _contract);
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void checkContractIllegalOverrides(ContractDefinition const& _contract);
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void checkContractAbstractFunctions(ContractDefinition const& _contract);
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void checkContractAbstractConstructors(ContractDefinition const& _contract);
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/// Checks that different functions with external visibility end up having different
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/// external argument types (i.e. different signature).
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void checkContractExternalTypeClashes(ContractDefinition const& _contract);
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/// Checks that all requirements for a library are fulfilled if this is a library.
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void checkLibraryRequirements(ContractDefinition const& _contract);
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virtual void endVisit(InheritanceSpecifier const& _inheritance) override;
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virtual bool visit(StructDefinition const& _struct) override;
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virtual bool visit(FunctionDefinition const& _function) override;
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virtual bool visit(VariableDeclaration const& _variable) override;
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/// We need to do this manually because we want to pass the bases of the current contract in
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/// case this is a base constructor call.
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void visitManually(ModifierInvocation const& _modifier, std::vector<ContractDefinition const*> const& _bases);
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virtual bool visit(EventDefinition const& _eventDef) override;
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virtual bool visit(IfStatement const& _ifStatement) override;
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virtual bool visit(WhileStatement const& _whileStatement) override;
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virtual bool visit(ForStatement const& _forStatement) override;
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virtual void endVisit(Return const& _return) override;
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virtual void endVisit(ExpressionStatement const& _statement) override;
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virtual bool visit(Assignment const& _assignment) override;
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virtual void endVisit(BinaryOperation const& _operation) override;
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virtual bool visit(UnaryOperation const& _operation) override;
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virtual bool visit(FunctionCall const& _functionCall) override;
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virtual void endVisit(NewExpression const& _newExpression) override;
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virtual bool visit(MemberAccess const& _memberAccess) override;
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virtual bool visit(IndexAccess const& _indexAccess) override;
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virtual bool visit(Identifier const& _identifier) override;
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virtual void endVisit(ElementaryTypeNameExpression const& _expr) override;
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virtual void endVisit(Literal const& _literal) override;
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/// @returns the referenced declaration and throws on error.
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Declaration const& dereference(Identifier const& _identifier);
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/// Runs type checks on @a _expression to infer its type and then checks that it is implicitly
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/// convertible to @a _expectedType.
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void expectType(Expression const& _expression, Type const& _expectedType);
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/// Runs type checks on @a _expression to infer its type and then checks that it is an LValue.
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void requireLValue(Expression const& _expression);
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std::vector<std::shared_ptr<Error const>> m_errors;
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};
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}
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}
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