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/*
This file is part of cpp-ethereum.
cpp-ethereum 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.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Parser part that determines the declarations corresponding to names and the types of expressions.
*/
#pragma once
#include <map>
#include <boost/noncopyable.hpp>
#include <libsolidity/Scope.h>
#include <libsolidity/ASTVisitor.h>
namespace dev
{
namespace solidity
{
/**
* Resolves name references, types and checks types of all expressions.
* Specifically, it checks that all operations are valid for the inferred types.
* An exception is throw on the first error.
*/
class NameAndTypeResolver: private boost::noncopyable
{
public:
explicit NameAndTypeResolver(std::vector<Declaration*> const& _globals);
void resolveNamesAndTypes(ContractDefinition& _contract);
/// Resolves the given @a _name inside the scope @a _scope. If @a _scope is omitted,
/// the global scope is used (i.e. the one containing only the contract).
/// @returns a pointer to the declaration on success or nullptr on failure.
Declaration* resolveName(ASTString const& _name, Declaration const* _scope = nullptr) const;
/// Resolves a name in the "current" scope. Should only be called during the initial
/// resolving phase.
Declaration* getNameFromCurrentScope(ASTString const& _name, bool _recursive = true);
private:
/// Throws if @a _struct contains a recursive loop. Note that recursion via mappings is fine.
void checkForRecursion(StructDefinition const& _struct);
void reset();
/// Maps nodes declaring a scope to scopes, i.e. ContractDefinition and FunctionDeclaration,
/// where nullptr denotes the global scope. Note that structs are not scope since they do
/// not contain code.
std::map<ASTNode const*, Scope> m_scopes;
Scope* m_currentScope;
};
/**
* Traverses the given AST upon construction and fills _scopes with all declarations inside the
* AST.
*/
class DeclarationRegistrationHelper: private ASTVisitor
{
public:
DeclarationRegistrationHelper(std::map<ASTNode const*, Scope>& _scopes, ASTNode& _astRoot);
private:
bool visit(ContractDefinition& _contract);
void endVisit(ContractDefinition& _contract);
bool visit(StructDefinition& _struct);
void endVisit(StructDefinition& _struct);
bool visit(FunctionDefinition& _function);
void endVisit(FunctionDefinition& _function);
void endVisit(VariableDefinition& _variableDefinition);
bool visit(VariableDeclaration& _declaration);
void enterNewSubScope(ASTNode& _node);
void closeCurrentScope();
void registerDeclaration(Declaration& _declaration, bool _opensScope);
std::map<ASTNode const*, Scope>& m_scopes;
Scope* m_currentScope;
FunctionDefinition* m_currentFunction;
};
/**
* Resolves references to declarations (of variables and types) and also establishes the link
* between a return statement and the return parameter list.
*/
class ReferencesResolver: private ASTVisitor
{
public:
ReferencesResolver(ASTNode& _root, NameAndTypeResolver& _resolver,
ParameterList* _returnParameters, bool _allowLazyTypes = true);
private:
virtual void endVisit(VariableDeclaration& _variable) override;
virtual bool visit(Identifier& _identifier) override;
virtual bool visit(UserDefinedTypeName& _typeName) override;
virtual bool visit(Mapping&) override;
virtual bool visit(Return& _return) override;
NameAndTypeResolver& m_resolver;
ParameterList* m_returnParameters;
bool m_allowLazyTypes;
};
}
}
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