Explicit calls to base class function.

libsolidity/AST.cpp

@@ -373,7 +373,8 @@ void MemberAccess::checkTypeRequirements()
 	Type const& type = *m_expression->getType();
 	m_type = type.getMemberType(*m_memberName);
 	if (!m_type)
-		BOOST_THROW_EXCEPTION(createTypeError("Member \"" + *m_memberName + "\" not found in " + type.toString()));
+		BOOST_THROW_EXCEPTION(createTypeError("Member \"" + *m_memberName + "\" not found or not "
+											  "visible in " + type.toString()));
 	//@todo later, this will not always be STORAGE
 	m_lvalue = type.getCategory() == Type::Category::STRUCT ? LValueType::STORAGE : LValueType::NONE;
 }
@@ -423,7 +424,7 @@ void Identifier::checkTypeRequirements()
 	ContractDefinition const* contractDef = dynamic_cast<ContractDefinition const*>(m_referencedDeclaration);
 	if (contractDef)
 	{
-		m_type = make_shared<TypeType>(make_shared<ContractType>(*contractDef));
+		m_type = make_shared<TypeType>(make_shared<ContractType>(*contractDef), m_currentContract);
 		return;
 	}
 	MagicVariableDeclaration const* magicVariable = dynamic_cast<MagicVariableDeclaration const*>(m_referencedDeclaration);

libsolidity/AST.h

@@ -595,7 +595,7 @@ public:
 	virtual void accept(ASTConstVisitor& _visitor) const override;
 	virtual void checkTypeRequirements() override;
 
-	void setFunctionReturnParameters(ParameterList& _parameters) { m_returnParameters = &_parameters; }
+	void setFunctionReturnParameters(ParameterList const& _parameters) { m_returnParameters = &_parameters; }
 	ParameterList const& getFunctionReturnParameters() const
 	{
 		solAssert(m_returnParameters, "");
@@ -607,7 +607,7 @@ private:
 	ASTPointer<Expression> m_expression; ///< value to return, optional
 
 	/// Pointer to the parameter list of the function, filled by the @ref NameAndTypeResolver.
-	ParameterList* m_returnParameters;
+	ParameterList const* m_returnParameters;
 };
 
 /**
@@ -884,21 +884,30 @@ class Identifier: public PrimaryExpression
 {
 public:
 	Identifier(Location const& _location, ASTPointer<ASTString> const& _name):
-		PrimaryExpression(_location), m_name(_name), m_referencedDeclaration(nullptr) {}
+		PrimaryExpression(_location), m_name(_name) {}
 	virtual void accept(ASTVisitor& _visitor) override;
 	virtual void accept(ASTConstVisitor& _visitor) const override;
 	virtual void checkTypeRequirements() override;
 
 	ASTString const& getName() const { return *m_name; }
 
-	void setReferencedDeclaration(Declaration const& _referencedDeclaration) { m_referencedDeclaration = &_referencedDeclaration; }
+	void setReferencedDeclaration(Declaration const& _referencedDeclaration,
+								  ContractDefinition const* _currentContract = nullptr)
+	{
+		m_referencedDeclaration = &_referencedDeclaration;
+		m_currentContract = _currentContract;
+	}
 	Declaration const* getReferencedDeclaration() const { return m_referencedDeclaration; }
+	ContractDefinition const* getCurrentContract() const { return m_currentContract; }
 
 private:
 	ASTPointer<ASTString> m_name;
 
 	/// Declaration the name refers to.
-	Declaration const* m_referencedDeclaration;
+	Declaration const* m_referencedDeclaration = nullptr;
+	/// Stores a reference to the current contract. This is needed because types of base contracts
+	/// change depending on the context.
+	ContractDefinition const* m_currentContract = nullptr;
 };
 
 /**

libsolidity/ExpressionCompiler.cpp

@@ -419,6 +419,22 @@ void ExpressionCompiler::endVisit(MemberAccess const& _memberAccess)
 		m_currentLValue.retrieveValueIfLValueNotRequested(_memberAccess);
 		break;
 	}
+	case Type::Category::TYPE:
+	{
+		TypeType const& type = dynamic_cast<TypeType const&>(*_memberAccess.getExpression().getType());
+		if (type.getMembers().getMemberType(member))
+		{
+			ContractDefinition const& contract = dynamic_cast<ContractType const&>(*type.getActualType())
+													.getContractDefinition();
+			for (ASTPointer<FunctionDefinition> const& function: contract.getDefinedFunctions())
+				if (function->getName() == member)
+				{
+					m_context << m_context.getFunctionEntryLabel(*function).pushTag();
+					return;
+				}
+		}
+		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid member access to " + type.toString()));
+	}
 	default:
 		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Member access to unknown type."));
 	}
@@ -449,20 +465,22 @@ void ExpressionCompiler::endVisit(Identifier const& _identifier)
 	{
 		if (magicVar->getType()->getCategory() == Type::Category::CONTRACT) // must be "this"
 			m_context << eth::Instruction::ADDRESS;
-		return;
 	}
-	if (FunctionDefinition const* functionDef = dynamic_cast<FunctionDefinition const*>(declaration))
-	{
+	else if (FunctionDefinition const* functionDef = dynamic_cast<FunctionDefinition const*>(declaration))
 		m_context << m_context.getVirtualFunctionEntryLabel(*functionDef).pushTag();
-		return;
-	}
-	if (dynamic_cast<VariableDeclaration const*>(declaration))
+	else if (dynamic_cast<VariableDeclaration const*>(declaration))
 	{
 		m_currentLValue.fromIdentifier(_identifier, *declaration);
 		m_currentLValue.retrieveValueIfLValueNotRequested(_identifier);
-		return;
 	}
-	BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Identifier type not expected in expression context."));
+	else if (dynamic_cast<ContractDefinition const*>(declaration))
+	{
+		// no-op
+	}
+	else
+	{
+		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Identifier type not expected in expression context."));
+	}
 }
 
 void ExpressionCompiler::endVisit(Literal const& _literal)

libsolidity/NameAndTypeResolver.cpp

@@ -49,7 +49,7 @@ void NameAndTypeResolver::resolveNamesAndTypes(ContractDefinition& _contract)
 	m_currentScope = &m_scopes[nullptr];
 
 	for (ASTPointer<Identifier> const& baseContract: _contract.getBaseContracts())
-		ReferencesResolver resolver(*baseContract, *this, nullptr);
+		ReferencesResolver resolver(*baseContract, *this, &_contract, nullptr);
 
 	m_currentScope = &m_scopes[&_contract];
 
@@ -58,13 +58,13 @@ void NameAndTypeResolver::resolveNamesAndTypes(ContractDefinition& _contract)
 		importInheritedScope(*base);
 
 	for (ASTPointer<StructDefinition> const& structDef: _contract.getDefinedStructs())
-		ReferencesResolver resolver(*structDef, *this, nullptr);
+		ReferencesResolver resolver(*structDef, *this, &_contract, nullptr);
 	for (ASTPointer<VariableDeclaration> const& variable: _contract.getStateVariables())
-		ReferencesResolver resolver(*variable, *this, nullptr);
+		ReferencesResolver resolver(*variable, *this, &_contract, nullptr);
 	for (ASTPointer<FunctionDefinition> const& function: _contract.getDefinedFunctions())
 	{
 		m_currentScope = &m_scopes[function.get()];
-		ReferencesResolver referencesResolver(*function, *this,
+		ReferencesResolver referencesResolver(*function, *this, &_contract,
 											  function->getReturnParameterList().get());
 	}
 }
@@ -267,8 +267,10 @@ void DeclarationRegistrationHelper::registerDeclaration(Declaration& _declaratio
 }
 
 ReferencesResolver::ReferencesResolver(ASTNode& _root, NameAndTypeResolver& _resolver,
-									   ParameterList* _returnParameters, bool _allowLazyTypes):
-	m_resolver(_resolver), m_returnParameters(_returnParameters), m_allowLazyTypes(_allowLazyTypes)
+									   ContractDefinition const* _currentContract,
+									   ParameterList const* _returnParameters, bool _allowLazyTypes):
+	m_resolver(_resolver), m_currentContract(_currentContract),
+	m_returnParameters(_returnParameters), m_allowLazyTypes(_allowLazyTypes)
 {
 	_root.accept(*this);
 }
@@ -316,7 +318,7 @@ bool ReferencesResolver::visit(Identifier& _identifier)
 	if (!declaration)
 		BOOST_THROW_EXCEPTION(DeclarationError() << errinfo_sourceLocation(_identifier.getLocation())
 												 << errinfo_comment("Undeclared identifier."));
-	_identifier.setReferencedDeclaration(*declaration);
+	_identifier.setReferencedDeclaration(*declaration, m_currentContract);
 	return false;
 }
 

libsolidity/NameAndTypeResolver.h

@@ -120,7 +120,9 @@ class ReferencesResolver: private ASTVisitor
 {
 public:
 	ReferencesResolver(ASTNode& _root, NameAndTypeResolver& _resolver,
-					   ParameterList* _returnParameters, bool _allowLazyTypes = true);
+					   ContractDefinition const* _currentContract,
+					   ParameterList const* _returnParameters,
+					   bool _allowLazyTypes = true);
 
 private:
 	virtual void endVisit(VariableDeclaration& _variable) override;
@@ -130,7 +132,8 @@ private:
 	virtual bool visit(Return& _return) override;
 
 	NameAndTypeResolver& m_resolver;
-	ParameterList* m_returnParameters;
+	ContractDefinition const* m_currentContract;
+	ParameterList const* m_returnParameters;
 	bool m_allowLazyTypes;
 };
 

libsolidity/Types.cpp

@@ -695,6 +695,29 @@ bool TypeType::operator==(Type const& _other) const
 	return *getActualType() == *other.getActualType();
 }
 
+MemberList const& TypeType::getMembers() const
+{
+	// We need to lazy-initialize it because of recursive references.
+	if (!m_members)
+	{
+		map<string, TypePointer> members;
+		if (m_actualType->getCategory() == Category::CONTRACT && m_currentContract != nullptr)
+		{
+			ContractDefinition const& contract = dynamic_cast<ContractType const&>(*m_actualType).getContractDefinition();
+			vector<ContractDefinition const*> currentBases = m_currentContract->getLinearizedBaseContracts();
+			if (find(currentBases.begin(), currentBases.end(), &contract) != currentBases.end())
+				// We are accessing the type of a base contract, so add all public and private
+				// functions. Note that this does not add inherited functions on purpose.
+				for (ASTPointer<FunctionDefinition> const& f: contract.getDefinedFunctions())
+					if (f->getName() != contract.getName())
+						members[f->getName()] = make_shared<FunctionType>(*f);
+		}
+		m_members.reset(new MemberList(members));
+	}
+	return *m_members;
+}
+
+
 MagicType::MagicType(MagicType::Kind _kind):
 	m_kind(_kind)
 {

libsolidity/Types.h

@@ -442,7 +442,8 @@ class TypeType: public Type
 {
 public:
 	virtual Category getCategory() const override { return Category::TYPE; }
-	TypeType(TypePointer const& _actualType): m_actualType(_actualType) {}
+	TypeType(TypePointer const& _actualType, ContractDefinition const* _currentContract = nullptr):
+		m_actualType(_actualType), m_currentContract(_currentContract) {}
 	TypePointer const& getActualType() const { return m_actualType; }
 
 	virtual TypePointer binaryOperatorResult(Token::Value, TypePointer const&) const override { return TypePointer(); }
@@ -451,9 +452,14 @@ public:
 	virtual u256 getStorageSize() const override { BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Storage size of non-storable type type requested.")); }
 	virtual bool canLiveOutsideStorage() const override { return false; }
 	virtual std::string toString() const override { return "type(" + m_actualType->toString() + ")"; }
+	virtual MemberList const& getMembers() const override;
 
 private:
 	TypePointer m_actualType;
+	/// Context in which this type is used (influences visibility etc.), can be nullptr.
+	ContractDefinition const* m_currentContract;
+	/// List of member types, will be lazy-initialized because of recursive references.
+	mutable std::unique_ptr<MemberList> m_members;
 };
 
 

test/SolidityEndToEndTest.cpp

@@ -1553,6 +1553,21 @@ BOOST_AUTO_TEST_CASE(single_copy_with_multiple_inheritance)
 	BOOST_CHECK(callContractFunction("getViaB()") == encodeArgs(23));
 }
 
+BOOST_AUTO_TEST_CASE(explicit_base_cass)
+{
+	char const* sourceCode = R"(
+		contract BaseBase { function g() returns (uint r) { return 1; } }
+		contract Base is BaseBase { function g() returns (uint r) { return 2; } }
+		contract Derived is Base {
+			function f() returns (uint r) { return BaseBase.g(); }
+			function g() returns (uint r) { return 3; }
+		}
+	)";
+	compileAndRun(sourceCode, 0, "Derived");
+	BOOST_CHECK(callContractFunction("g()") == encodeArgs(3));
+	BOOST_CHECK(callContractFunction("f()") == encodeArgs(1));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }