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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 <list>
#include <boost/noncopyable.hpp>
#include <libsolidity/DeclarationContainer.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*> const& _globals);
/// Registers all declarations found in the source unit.
void registerDeclarations(SourceUnit& _sourceUnit);
/// Resolves all names and types referenced from the given contract.
void resolveNamesAndTypes(ContractDefinition& _contract);
/// Check all type requirements in the given contract.
void checkTypeRequirements(ContractDefinition& _contract);
/// Updates the given global declaration (used for "this"). Not to be used with declarations
/// that create their own scope.
void updateDeclaration(Declaration const& _declaration);
/// 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.
std::vector<Declaration const*> 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.
std::vector<Declaration const*> nameFromCurrentScope(ASTString const& _name, bool _recursive = true);
/// returns the vector of declarations without repetitions
static std::vector<Declaration const*> cleanedDeclarations(
Identifier const& _identifier,
std::vector<Declaration const*> const& _declarations
);
private:
void reset();
/// Imports all members declared directly in the given contract (i.e. does not import inherited members)
/// into the current scope if they are not present already.
void importInheritedScope(ContractDefinition const& _base);
/// Computes "C3-Linearization" of base contracts and stores it inside the contract.
void linearizeBaseContracts(ContractDefinition& _contract) const;
/// Computes the C3-merge of the given list of lists of bases.
/// @returns the linearized vector or an empty vector if linearization is not possible.
template <class _T>
static std::vector<_T const*> cThreeMerge(std::list<std::list<_T const*>>& _toMerge);
/// 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*, DeclarationContainer> m_scopes;
DeclarationContainer* m_currentScope = nullptr;
};
/**
* 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*, DeclarationContainer>& _scopes, ASTNode& _astRoot);
private:
bool visit(ContractDefinition& _contract) override;
void endVisit(ContractDefinition& _contract) override;
bool visit(StructDefinition& _struct) override;
void endVisit(StructDefinition& _struct) override;
bool visit(EnumDefinition& _enum) override;
void endVisit(EnumDefinition& _enum) override;
bool visit(EnumValue& _value) override;
bool visit(FunctionDefinition& _function) override;
void endVisit(FunctionDefinition& _function) override;
bool visit(ModifierDefinition& _modifier) override;
void endVisit(ModifierDefinition& _modifier) override;
void endVisit(VariableDeclarationStatement& _variableDeclarationStatement) override;
bool visit(VariableDeclaration& _declaration) override;
bool visit(EventDefinition& _event) override;
void endVisit(EventDefinition& _event) override;
void enterNewSubScope(Declaration const& _declaration);
void closeCurrentScope();
void registerDeclaration(Declaration& _declaration, bool _opensScope);
std::map<ASTNode const*, DeclarationContainer>& m_scopes;
Declaration const* m_currentScope;
VariableScope* 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,
ContractDefinition const* _currentContract,
ParameterList const* _returnParameters,
bool _resolveInsideCode = false,
bool _allowLazyTypes = true
);
private:
virtual void endVisit(VariableDeclaration& _variable) override;
virtual bool visit(Block&) override { return m_resolveInsideCode; }
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;
ContractDefinition const* m_currentContract;
ParameterList const* m_returnParameters;
bool m_resolveInsideCode;
bool m_allowLazyTypes;
};
}
}
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