mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
0c69d5fdcd
Added tests, disallowed non-calling usage of non-unique function references.
156 lines
5.8 KiB
C++
156 lines
5.8 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 2014
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* Parser part that determines the declarations corresponding to names and the types of expressions.
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*/
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#pragma once
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#include <map>
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#include <list>
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#include <boost/noncopyable.hpp>
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#include <libsolidity/DeclarationContainer.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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* Resolves name references, types and checks types of all expressions.
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* Specifically, it checks that all operations are valid for the inferred types.
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* An exception is throw on the first error.
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*/
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class NameAndTypeResolver: private boost::noncopyable
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{
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public:
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explicit NameAndTypeResolver(std::vector<Declaration const*> const& _globals);
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/// Registers all declarations found in the source unit.
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void registerDeclarations(SourceUnit& _sourceUnit);
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/// Resolves all names and types referenced from the given contract.
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void resolveNamesAndTypes(ContractDefinition& _contract);
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/// Check all type requirements in the given contract.
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void checkTypeRequirements(ContractDefinition& _contract);
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/// Updates the given global declaration (used for "this"). Not to be used with declarations
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/// that create their own scope.
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void updateDeclaration(Declaration const& _declaration);
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/// Resolves the given @a _name inside the scope @a _scope. If @a _scope is omitted,
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/// the global scope is used (i.e. the one containing only the contract).
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/// @returns a pointer to the declaration on success or nullptr on failure.
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std::set<Declaration const*> resolveName(ASTString const& _name, Declaration const* _scope = nullptr) const;
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/// Resolves a name in the "current" scope. Should only be called during the initial
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/// resolving phase.
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std::set<Declaration const*> getNameFromCurrentScope(ASTString const& _name, bool _recursive = true);
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private:
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void reset();
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/// Either imports all non-function members or all function members declared directly in the
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/// given contract (i.e. does not import inherited members) into the current scope if they are
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///not present already.
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void importInheritedScope(ContractDefinition const& _base, bool _importFunctions);
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/// Computes "C3-Linearization" of base contracts and stores it inside the contract.
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void linearizeBaseContracts(ContractDefinition& _contract) const;
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/// Computes the C3-merge of the given list of lists of bases.
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/// @returns the linearized vector or an empty vector if linearization is not possible.
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template <class _T>
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static std::vector<_T const*> cThreeMerge(std::list<std::list<_T const*>>& _toMerge);
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/// Maps nodes declaring a scope to scopes, i.e. ContractDefinition and FunctionDeclaration,
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/// where nullptr denotes the global scope. Note that structs are not scope since they do
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/// not contain code.
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std::map<ASTNode const*, DeclarationContainer> m_scopes;
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DeclarationContainer* m_currentScope = nullptr;
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};
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/**
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* Traverses the given AST upon construction and fills _scopes with all declarations inside the
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* AST.
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*/
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class DeclarationRegistrationHelper: private ASTVisitor
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{
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public:
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DeclarationRegistrationHelper(std::map<ASTNode const*, DeclarationContainer>& _scopes, ASTNode& _astRoot);
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private:
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bool visit(ContractDefinition& _contract) override;
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void endVisit(ContractDefinition& _contract) override;
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bool visit(StructDefinition& _struct) override;
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void endVisit(StructDefinition& _struct) override;
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bool visit(EnumDefinition& _enum) override;
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void endVisit(EnumDefinition& _enum) override;
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bool visit(EnumValue& _value) override;
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bool visit(FunctionDefinition& _function) override;
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void endVisit(FunctionDefinition& _function) override;
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bool visit(ModifierDefinition& _modifier) override;
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void endVisit(ModifierDefinition& _modifier) override;
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void endVisit(VariableDeclarationStatement& _variableDeclarationStatement) override;
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bool visit(VariableDeclaration& _declaration) override;
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bool visit(EventDefinition& _event) override;
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void endVisit(EventDefinition& _event) override;
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void enterNewSubScope(Declaration const& _declaration);
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void closeCurrentScope();
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void registerDeclaration(Declaration& _declaration, bool _opensScope);
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std::map<ASTNode const*, DeclarationContainer>& m_scopes;
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Declaration const* m_currentScope;
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VariableScope* m_currentFunction;
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};
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/**
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* Resolves references to declarations (of variables and types) and also establishes the link
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* between a return statement and the return parameter list.
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*/
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class ReferencesResolver: private ASTVisitor
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{
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public:
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ReferencesResolver(
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ASTNode& _root,
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NameAndTypeResolver& _resolver,
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ContractDefinition const* _currentContract,
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ParameterList const* _returnParameters,
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bool _resolveInsideCode = false,
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bool _allowLazyTypes = true
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);
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private:
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virtual void endVisit(VariableDeclaration& _variable) override;
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virtual bool visit(Block&) override { return m_resolveInsideCode; }
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virtual bool visit(Identifier& _identifier) override;
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virtual bool visit(UserDefinedTypeName& _typeName) override;
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virtual bool visit(Mapping&) override;
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virtual bool visit(Return& _return) override;
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NameAndTypeResolver& m_resolver;
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ContractDefinition const* m_currentContract;
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ParameterList const* m_returnParameters;
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bool m_resolveInsideCode;
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bool m_allowLazyTypes;
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};
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}
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}
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