Adding mapping treatment to FunctionType

Plus a TypeResolution test for it

libsolidity/Types.cpp

@@ -621,12 +621,25 @@ FunctionType::FunctionType(FunctionDefinition const& _function, bool _isInternal
 FunctionType::FunctionType(VariableDeclaration const& _varDecl):
 	m_location(Location::EXTERNAL), m_isConstant(true), m_declaration(&_varDecl)
 {
-	TypePointers params({});
-	vector<string> paramNames({});
-	TypePointers retParams({_varDecl.getType()});
-	vector<string> retParamNames({ _varDecl.getName()});
-	// for now, no input parameters LTODO: change for some things like mapping
+	TypePointers params;
+	vector<string> paramNames;
+	TypePointers retParams;
+	vector<string> retParamNames;
+	TypePointer varDeclType = _varDecl.getType();
+	auto mappingType = dynamic_cast<const MappingType*>(varDeclType.get());
+	if (mappingType!= nullptr)
+	{
+		params.push_back(mappingType->getKeyType());
+		paramNames.push_back(mappingType->getKeyType()->toString());
 
+		retParams.push_back(mappingType->getValueType());
+		retParamNames.push_back(mappingType->getValueType()->toString());
+	}
+	else // elelemntary type
+	{
+		retParams.push_back(varDeclType);
+		retParamNames.push_back(_varDecl.getName());
+	}
 	swap(params, m_parameterTypes);
 	swap(paramNames, m_parameterNames);
 	swap(retParams, m_returnParameterTypes);

test/SolidityNameAndTypeResolution.cpp

@@ -637,6 +637,7 @@ BOOST_AUTO_TEST_CASE(state_variable_accessors)
 					   "    uint64(2);\n"
 					   "  }\n"
 					   "uint256 foo;\n"
+					   "mapping(uint=>string4) map;\n"
 					   "}\n";
 
 	ASTPointer<SourceUnit> source;
@@ -644,10 +645,17 @@ BOOST_AUTO_TEST_CASE(state_variable_accessors)
 	BOOST_CHECK_NO_THROW(source = parseTextAndResolveNamesWithChecks(text));
 	BOOST_REQUIRE((contract = retrieveContract(source, 0)) != nullptr);
 	FunctionTypePointer function = retrieveFunctionBySignature(contract, "foo()");
-	BOOST_REQUIRE(function->hasDeclaration());
+	BOOST_REQUIRE(function && function->hasDeclaration());
 	auto returnParams = function->getReturnParameterTypeNames();
 	BOOST_CHECK_EQUAL(returnParams.at(0), "uint256");
 	BOOST_CHECK(function->isConstant());
+	function = retrieveFunctionBySignature(contract, "map(uint256)");
+	BOOST_REQUIRE(function && function->hasDeclaration());
+	auto Params = function->getParameterTypeNames();
+	BOOST_CHECK_EQUAL(returnParams.at(0), "uint256");
+	returnParams = function->getReturnParameterTypeNames();
+	BOOST_CHECK_EQUAL(returnParams.at(0), "string4");
+	BOOST_CHECK(function->isConstant());
 }
 
 BOOST_AUTO_TEST_CASE(function_clash_with_state_variable_accessor)