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120 lines
4.0 KiB
120 lines
4.0 KiB
/*
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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 <boost/noncopyable.hpp>
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#include <libsolidity/Scope.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& _globals);
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void resolveNamesAndTypes(ContractDefinition& _contract);
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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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Declaration* 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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Declaration* getNameFromCurrentScope(ASTString const& _name, bool _recursive = true);
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private:
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/// Throws if @a _struct contains a recursive loop. Note that recursion via mappings is fine.
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void checkForRecursion(StructDefinition const& _struct);
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void reset();
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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*, Scope> m_scopes;
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Scope* m_currentScope;
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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*, Scope>& _scopes, ASTNode& _astRoot);
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private:
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bool visit(ContractDefinition& _contract);
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void endVisit(ContractDefinition& _contract);
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bool visit(StructDefinition& _struct);
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void endVisit(StructDefinition& _struct);
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bool visit(FunctionDefinition& _function);
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void endVisit(FunctionDefinition& _function);
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void endVisit(VariableDefinition& _variableDefinition);
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bool visit(VariableDeclaration& _declaration);
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void enterNewSubScope(ASTNode& _node);
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void closeCurrentScope();
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void registerDeclaration(Declaration& _declaration, bool _opensScope);
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std::map<ASTNode const*, Scope>& m_scopes;
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Scope* m_currentScope;
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FunctionDefinition* 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(ASTNode& _root, NameAndTypeResolver& _resolver,
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ParameterList* _returnParameters, bool _allowLazyTypes = true);
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private:
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virtual void endVisit(VariableDeclaration& _variable) override;
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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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ParameterList* m_returnParameters;
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bool m_allowLazyTypes;
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};
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}
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}
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