Support metadata via IR.

libyul/backends/evm/AbstractAssembly.h

@@ -110,6 +110,9 @@ public:
 	/// Appends an assignment to an immutable variable.
 	virtual void appendImmutableAssignment(std::string const& _identifier) = 0;
 
+	/// Appends data to the very end of the bytecode. Repeated calls concatenate.
+	virtual void appendToAuxiliaryData(bytes const& _data) = 0;
+
 	/// Mark this assembly as invalid. Any attempt to request bytecode from it should throw.
 	virtual void markAsInvalid() = 0;
 };

libyul/backends/evm/EVMObjectCompiler.cpp

@@ -53,7 +53,11 @@ void EVMObjectCompiler::run(Object& _object, bool _optimize)
 		else
 		{
 			Data const& data = dynamic_cast<Data const&>(*subNode);
-			context.subIDs[data.name] = m_assembly.appendData(data.data);
+			// Special handling of metadata.
+			if (data.name.str() == Object::metadataName())
+				m_assembly.appendToAuxiliaryData(data.data);
+			else
+				context.subIDs[data.name] = m_assembly.appendData(data.data);
 		}
 
 	yulAssert(_object.analysisInfo, "No analysis info.");

libyul/backends/evm/EthAssemblyAdapter.cpp

@@ -161,6 +161,11 @@ AbstractAssembly::SubID EthAssemblyAdapter::appendData(bytes const& _data)
 	return subID;
 }
 
+void EthAssemblyAdapter::appendToAuxiliaryData(bytes const& _data)
+{
+	m_assembly.appendToAuxiliaryData(_data);
+}
+
 void EthAssemblyAdapter::appendImmutable(std::string const& _identifier)
 {
 	m_assembly.appendImmutable(_identifier);

libyul/backends/evm/EthAssemblyAdapter.h

@@ -58,6 +58,8 @@ public:
 	void appendDataSize(std::vector<SubID> const& _subPath) override;
 	SubID appendData(bytes const& _data) override;
 
+	void appendToAuxiliaryData(bytes const& _data) override;
+
 	void appendImmutable(std::string const& _identifier) override;
 	void appendImmutableAssignment(std::string const& _identifier) override;
 

libyul/backends/evm/NoOutputAssembly.h

@@ -70,6 +70,8 @@ public:
 	void appendDataSize(std::vector<SubID> const& _subPath) override;
 	SubID appendData(bytes const& _data) override;
 
+	void appendToAuxiliaryData(bytes const&) override {}
+
 	void appendImmutable(std::string const& _identifier) override;
 	void appendImmutableAssignment(std::string const& _identifier) override;