Possibility to call library functions.

libsolidity/CompilerContext.h

@@ -112,6 +112,8 @@ public:
 	void appendProgramSize() { return m_asm.appendProgramSize(); }
 	/// Adds data to the data section, pushes a reference to the stack
 	eth::AssemblyItem appendData(bytes const& _data) { return m_asm.append(_data); }
+	/// Appends the address (virtual, will be filled in by linker) of a library.
+	void appendLibraryAddress(std::string const& _identifier) { m_asm.appendLibraryAddress(_identifier); }
 	/// Resets the stack of visited nodes with a new stack having only @c _node
 	void resetVisitedNodes(ASTNode const* _node);
 	/// Pops the stack of visited nodes

libsolidity/ExpressionCompiler.cpp

@@ -772,9 +772,15 @@ void ExpressionCompiler::endVisit(MemberAccess const& _memberAccess)
 
 		if (dynamic_cast<ContractType const*>(type.actualType().get()))
 		{
-			auto const* function = dynamic_cast<FunctionDefinition const*>(_memberAccess.referencedDeclaration());
+			auto const& funType = dynamic_cast<FunctionType const&>(*_memberAccess.type());
-			solAssert(!!function, "Function not found in member access");
+			if (funType.location() != FunctionType::Location::Internal)
-			m_context << m_context.functionEntryLabel(*function).pushTag();
+				m_context << funType.externalIdentifier();
+			else
+			{
+				auto const* function = dynamic_cast<FunctionDefinition const*>(_memberAccess.referencedDeclaration());
+				solAssert(!!function, "Function not found in member access");
+				m_context << m_context.functionEntryLabel(*function).pushTag();
+			}
 		}
 		else if (auto enumType = dynamic_cast<EnumType const*>(type.actualType().get()))
 			m_context << enumType->memberValue(_memberAccess.memberName());
@@ -923,9 +929,11 @@ void ExpressionCompiler::endVisit(Identifier const& _identifier)
 			utils().convertType(*variable->value()->type(), *variable->type());
 		}
 	}
-	else if (dynamic_cast<ContractDefinition const*>(declaration))
+	else if (auto contract = dynamic_cast<ContractDefinition const*>(declaration))
 	{
-		// no-op
+		if (contract->isLibrary())
+			//@todo name should be unique, change once we have module management
+			m_context.appendLibraryAddress(contract->name());
 	}
 	else if (dynamic_cast<EventDefinition const*>(declaration))
 	{

libsolidity/Types.cpp

@@ -971,7 +971,7 @@ MemberList const& ContractType::members() const
 			for (auto const& it: m_contract.interfaceFunctions())
 				members.push_back(MemberList::Member(
 					it.second->declaration().name(),
-					it.second->asMemberFunction(),
+					it.second->asMemberFunction(false),
 					&it.second->declaration()
 				));
 		m_members.reset(new MemberList(members));
@@ -1538,7 +1538,7 @@ TypePointer FunctionType::copyAndSetGasOrValue(bool _setGas, bool _setValue) con
 	);
 }
 
-FunctionTypePointer FunctionType::asMemberFunction() const
+FunctionTypePointer FunctionType::asMemberFunction(bool _inLibrary) const
 {
 	TypePointers parameterTypes;
 	for (auto const& t: m_parameterTypes)
@@ -1563,7 +1563,7 @@ FunctionTypePointer FunctionType::asMemberFunction() const
 		returnParameterTypes,
 		m_parameterNames,
 		returnParameterNames,
-		m_location,
+		_inLibrary ? Location::CallCode : m_location,
 		m_arbitraryParameters,
 		m_declaration,
 		m_gasSet,
@@ -1633,21 +1633,39 @@ u256 TypeType::storageSize() const
 			<< errinfo_comment("Storage size of non-storable type type requested."));
 }
 
+unsigned TypeType::sizeOnStack() const
+{
+	if (auto contractType = dynamic_cast<ContractType const*>(m_actualType.get()))
+		if (contractType->contractDefinition().isLibrary())
+			return 1;
+	return 0;
+}
+
 MemberList const& TypeType::members() const
 {
 	// We need to lazy-initialize it because of recursive references.
 	if (!m_members)
 	{
 		MemberList::MemberMap members;
-		if (m_actualType->category() == Category::Contract && m_currentContract != nullptr)
+		if (m_actualType->category() == Category::Contract)
 		{
 			ContractDefinition const& contract = dynamic_cast<ContractType const&>(*m_actualType).contractDefinition();
-			vector<ContractDefinition const*> currentBases = m_currentContract->linearizedBaseContracts();
+			if (contract.isLibrary())
-			if (find(currentBases.begin(), currentBases.end(), &contract) != currentBases.end())
+				for (auto const& it: contract.interfaceFunctions())
-				// We are accessing the type of a base contract, so add all public and protected
+					members.push_back(MemberList::Member(
-				// members. Note that this does not add inherited functions on purpose.
+						it.second->declaration().name(),
-				for (Declaration const* decl: contract.inheritableMembers())
+						it.second->asMemberFunction(true), // use callcode
-					members.push_back(MemberList::Member(decl->name(), decl->type(), decl));
+						&it.second->declaration()
+					));
+			else if (m_currentContract != nullptr)
+			{
+				vector<ContractDefinition const*> currentBases = m_currentContract->linearizedBaseContracts();
+				if (find(currentBases.begin(), currentBases.end(), &contract) != currentBases.end())
+					// We are accessing the type of a base contract, so add all public and protected
+					// members. Note that this does not add inherited functions on purpose.
+					for (Declaration const* decl: contract.inheritableMembers())
+						members.push_back(MemberList::Member(decl->name(), decl->type(), decl));
+			}
 		}
 		else if (m_actualType->category() == Category::Enum)
 		{

libsolidity/Types.h

@@ -517,7 +517,7 @@ private:
 };
 
 /**
- * The type of a contract instance, there is one distinct type for each contract definition.
+ * The type of a contract instance or library, there is one distinct type for each contract definition.
  */
 class ContractType: public Type
 {
@@ -788,7 +788,8 @@ public:
 	/// removed and the location of reference types is changed from CallData to Memory.
 	/// This is needed if external functions are called on other contracts, as they cannot return
 	/// dynamic values.
-	FunctionTypePointer asMemberFunction() const;
+	/// @param _inLibrary if true, uses CallCode as location.
+	FunctionTypePointer asMemberFunction(bool _inLibrary) const;
 
 private:
 	static TypePointers parseElementaryTypeVector(strings const& _types);
@@ -851,6 +852,7 @@ public:
 /**
  * The type of a type reference. The type of "uint32" when used in "a = uint32(2)" is an example
  * of a TypeType.
+ * For super contracts or libraries, this has members directly.
  */
 class TypeType: public Type
 {
@@ -865,7 +867,7 @@ public:
 	virtual bool canBeStored() const override { return false; }
 	virtual u256 storageSize() const override;
 	virtual bool canLiveOutsideStorage() const override { return false; }
-	virtual unsigned sizeOnStack() const override { return 0; }
+	virtual unsigned sizeOnStack() const override;
 	virtual std::string toString(bool _short) const override { return "type(" + m_actualType->toString(_short) + ")"; }
 	virtual MemberList const& members() const override;
 

test/libsolidity/SolidityEndToEndTest.cpp

@@ -5230,6 +5230,38 @@ BOOST_AUTO_TEST_CASE(storage_string_as_mapping_key_without_variable)
 	BOOST_CHECK(callContractFunction("f()") == encodeArgs(u256(2)));
 }
 
+BOOST_AUTO_TEST_CASE(library_call)
+{
+	char const* sourceCode = R"(
+		library Lib { function m(uint x, uint y) returns (uint) { return x * y; } }
+		contract Test {
+			function f(uint x) returns (uint) {
+				return Lib.m(x, 9);
+			}
+		}
+	)";
+	compileAndRun(sourceCode, 0, "Lib");
+	compileAndRun(sourceCode, 0, "Test", bytes(), map<string, Address>{{"Lib", m_contractAddress}});
+	BOOST_CHECK(callContractFunction("f(uint256)", u256(33)) == encodeArgs(u256(33) * 9));
+}
+
+BOOST_AUTO_TEST_CASE(library_stray_values)
+{
+	char const* sourceCode = R"(
+		library Lib { function m(uint x, uint y) returns (uint) { return x * y; } }
+		contract Test {
+			function f(uint x) returns (uint) {
+				Lib;
+				Lib.m;
+				return x + 9;
+			}
+		}
+	)";
+	compileAndRun(sourceCode, 0, "Lib");
+	compileAndRun(sourceCode, 0, "Test", bytes(), map<string, Address>{{"Lib", m_contractAddress}});
+	BOOST_CHECK(callContractFunction("f(uint256)", u256(33)) == encodeArgs(u256(42)));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }

test/libsolidity/SolidityNameAndTypeResolution.cpp

@@ -2228,6 +2228,22 @@ BOOST_AUTO_TEST_CASE(valid_library)
 	BOOST_CHECK_NO_THROW(parseTextAndResolveNames(text));
 }
 
+BOOST_AUTO_TEST_CASE(call_to_library_function)
+{
+	char const* text = R"(
+		library Lib {
+			uint constant public pimil = 3141592;
+			function min(uint x, uint y) returns (uint);
+		}
+		contract Test {
+			function f() {
+				uint t = Lib.min(Lib.pimil(), 7);
+			}
+		}
+	)";
+	BOOST_CHECK_NO_THROW(parseTextAndResolveNames(text));
+}
+
 BOOST_AUTO_TEST_CASE(creating_contract_within_the_contract)
 {
 	char const* sourceCode = R"(

test/libsolidity/solidityExecutionFramework.h

@@ -53,14 +53,17 @@ public:
 		std::string const& _sourceCode,
 		u256 const& _value = 0,
 		std::string const& _contractName = "",
-		bytes const& _arguments = bytes()
+		bytes const& _arguments = bytes(),
+		std::map<std::string, Address> const& _libraryAddresses = std::map<std::string, Address>()
 	)
 	{
 		m_compiler.reset(false, m_addStandardSources);
 		m_compiler.addSource("", _sourceCode);
 		ETH_TEST_REQUIRE_NO_THROW(m_compiler.compile(m_optimize, m_optimizeRuns), "Compiling contract failed");
-		bytes code = m_compiler.object(_contractName).bytecode;
+		eth::LinkerObject obj = m_compiler.object(_contractName);
-		sendMessage(code + _arguments, true, _value);
+		obj.link(_libraryAddresses);
+		BOOST_REQUIRE(obj.linkReferences.empty());
+		sendMessage(obj.bytecode + _arguments, true, _value);
 		return m_output;
 	}
 
@@ -76,10 +79,11 @@ public:
 		std::string const& _sourceCode,
 		u256 const& _value = 0,
 		std::string const& _contractName = "",
-		bytes const& _arguments = bytes()
+		bytes const& _arguments = bytes(),
+		std::map<std::string, Address> const& _libraryAddresses = std::map<std::string, Address>()
 	)
 	{
-		compileAndRunWithoutCheck(_sourceCode, _value, _contractName, _arguments);
+		compileAndRunWithoutCheck(_sourceCode, _value, _contractName, _arguments, _libraryAddresses);
 		BOOST_REQUIRE(!m_output.empty());
 		return m_output;
 	}