Check availability of data objects already in analysis phase.

Changelog.md

@@ -18,6 +18,7 @@ Compiler Features:
 
 Bugfixes:
  * View/Pure Checker: Properly detect state variable access through base class.
+ * Yul analyzer: Check availability of data objects already in analysis phase.
 
 
 

libyul/AsmAnalysis.cpp

@@ -383,11 +383,19 @@ bool AsmAnalyzer::operator()(FunctionCall const& _funCall)
 	{
 		if (!expectExpression(arg))
 			success = false;
-		else if (needsLiteralArguments && arg.type() != typeid(Literal))
-			m_errorReporter.typeError(
-				_funCall.functionName.location,
-				"Function expects direct literals as arguments."
-			);
+		else if (needsLiteralArguments)
+		{
+			if (arg.type() != typeid(Literal))
+				m_errorReporter.typeError(
+					_funCall.functionName.location,
+					"Function expects direct literals as arguments."
+				);
+			else if (!m_dataNames.count(boost::get<Literal>(arg).value))
+				m_errorReporter.typeError(
+					_funCall.functionName.location,
+					"Unknown data object \"" + boost::get<Literal>(arg).value.str() + "\"."
+				);
+		}
 	}
 	// Use argument size instead of parameter count to avoid misleading errors.
 	m_stackHeight += int(returns) - int(_funCall.arguments.size());

libyul/AsmAnalysis.h

@@ -61,13 +61,15 @@ public:
 		langutil::ErrorReporter& _errorReporter,
 		boost::optional<langutil::Error::Type> _errorTypeForLoose,
 		Dialect const& _dialect,
-		ExternalIdentifierAccess::Resolver const& _resolver = ExternalIdentifierAccess::Resolver()
+		ExternalIdentifierAccess::Resolver const& _resolver = ExternalIdentifierAccess::Resolver(),
+		std::set<YulString> const& _dataNames = {}
 	):
 		m_resolver(_resolver),
 		m_info(_analysisInfo),
 		m_errorReporter(_errorReporter),
 		m_dialect(_dialect),
-		m_errorTypeForLoose(_errorTypeForLoose)
+		m_errorTypeForLoose(_errorTypeForLoose),
+		m_dataNames(_dataNames)
 	{
 		if (EVMDialect const* evmDialect = dynamic_cast<EVMDialect const*>(&m_dialect))
 			m_evmVersion = evmDialect->evmVersion();
@@ -124,6 +126,8 @@ private:
 	langutil::EVMVersion m_evmVersion;
 	Dialect const& m_dialect;
 	boost::optional<langutil::Error::Type> m_errorTypeForLoose;
+	/// Names of data objects to be referenced by builtin functions with literal arguments.
+	std::set<YulString> m_dataNames;
 	ForLoop const* m_currentForLoop = nullptr;
 };
 

libyul/AssemblyStack.cpp

@@ -113,7 +113,20 @@ bool AssemblyStack::analyzeParsed(Object& _object)
 {
 	solAssert(_object.code, "");
 	_object.analysisInfo = make_shared<AsmAnalysisInfo>();
-	AsmAnalyzer analyzer(*_object.analysisInfo, m_errorReporter, boost::none, languageToDialect(m_language, m_evmVersion));
+
+	set<YulString> objectNames;
+	objectNames.insert(_object.name);
+	for (auto const& subObject: _object.subIndexByName)
+		objectNames.insert(subObject.first);
+
+	AsmAnalyzer analyzer(
+		*_object.analysisInfo,
+		m_errorReporter,
+		boost::none,
+		languageToDialect(m_language, m_evmVersion),
+		{},
+		objectNames
+	);
 	bool success = analyzer.analyze(*_object.code);
 	for (auto& subNode: _object.subObjects)
 		if (auto subObject = dynamic_cast<Object*>(subNode.get()))

test/libyul/ObjectParser.cpp

@@ -278,6 +278,19 @@ BOOST_AUTO_TEST_CASE(args_to_datacopy_are_arbitrary)
 	BOOST_CHECK(successParse(code));
 }
 
+
+BOOST_AUTO_TEST_CASE(non_existing_objects)
+{
+	BOOST_CHECK(successParse(
+		"object \"main\" { code { pop(datasize(\"main\")) } }"
+	));
+	CHECK_ERROR(
+		"object \"main\" { code { pop(datasize(\"abc\")) } }",
+		TypeError,
+		"Unknown data object"
+	);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }

test/libyul/yulOptimizerTests/commonSubexpressionEliminator/object_access.yul

@@ -1,15 +1,18 @@
-{
-    // Arguments to ``datasize`` and ``dataoffset`` need to be
-    // literals. We cannot simplify their arguments, but we can
-    // simplify them as a full expression.
-    // ``datacopy`` does not have this restriction.
-    let r := "abc"
-    let a := datasize("abc")
-    let x := dataoffset("abc")
-    // should be replaced by a
-    let y := datasize("abc")
-    datacopy("abc", x, y)
-    mstore(a, x)
+object "main" {
+    code {
+        // Arguments to ``datasize`` and ``dataoffset`` need to be
+        // literals. We cannot simplify their arguments, but we can
+        // simplify them as a full expression.
+        // ``datacopy`` does not have this restriction.
+        let r := "abc"
+        let a := datasize("abc")
+        let x := dataoffset("abc")
+        // should be replaced by a
+        let y := datasize("abc")
+        datacopy("abc", x, y)
+        mstore(a, x)
+    }
+    data "abc" "Hello, World!"
 }
 // ====
 // step: commonSubexpressionEliminator

test/libyul/yulOptimizerTests/expressionSplitter/object_access.yul

@@ -1,10 +1,13 @@
-{
-    // We should never split arguments to ``dataoffset``
-    // or ``datasize`` because they need to be literals
-    let x := dataoffset("abc")
-    let y := datasize("abc")
-    // datacopy is fine, though
-    datacopy(mload(0), mload(1), mload(2))
+object "main" {
+    code {
+        // We should never split arguments to ``dataoffset``
+        // or ``datasize`` because they need to be literals
+        let x := dataoffset("abc")
+        let y := datasize("abc")
+        // datacopy is fine, though
+        datacopy(mload(0), mload(1), mload(2))
+    }
+    data "abc" "Hello, World!"
 }
 // ====
 // step: expressionSplitter