Named assembly labels.

libjulia/backends/evm/AbstractAssembly.h

@@ -66,6 +66,8 @@ public:
 	virtual void appendLabelReference(LabelID _labelId) = 0;
 	/// Generate a new unique label.
 	virtual LabelID newLabelId() = 0;
+	/// Returns a label identified by the given name. Creates it if it does not yet exist.
+	virtual LabelID namedLabel(std::string const& _name) = 0;
 	/// Append a reference to a to-be-linked symobl.
 	/// Currently, we assume that the value is always a 20 byte number.
 	virtual void appendLinkerSymbol(std::string const& _name) = 0;

libjulia/backends/evm/EVMAssembly.cpp

@@ -77,6 +77,14 @@ EVMAssembly::LabelID EVMAssembly::newLabelId()
 	return m_nextLabelId++;
 }
 
+AbstractAssembly::LabelID EVMAssembly::namedLabel(string const& _name)
+{
+	solAssert(!_name.empty(), "");
+	if (!m_namedLabels.count(_name))
+		m_namedLabels[_name] = newLabelId();
+	return m_namedLabels[_name];
+}
+
 void EVMAssembly::appendLinkerSymbol(string const&)
 {
 	solAssert(false, "Linker symbols not yet implemented.");

libjulia/backends/evm/EVMAssembly.h

@@ -52,6 +52,8 @@ public:
 	virtual void appendLabelReference(LabelID _labelId) override;
 	/// Generate a new unique label.
 	virtual LabelID newLabelId() override;
+	/// Returns a label identified by the given name. Creates it if it does not yet exist.
+	virtual LabelID namedLabel(std::string const& _name) override;
 	/// Append a reference to a to-be-linked symobl.
 	/// Currently, we assume that the value is always a 20 byte number.
 	virtual void appendLinkerSymbol(std::string const& _name) override;
@@ -85,6 +87,7 @@ private:
 	LabelID m_nextLabelId = 0;
 	int m_stackHeight = 0;
 	bytes m_bytecode;
+	std::map<std::string, LabelID> m_namedLabels;
 	std::map<LabelID, size_t> m_labelPositions;
 	std::map<size_t, LabelID> m_labelReferences;
 	std::vector<size_t> m_assemblySizePositions;

libjulia/backends/evm/EVMCodeTransform.cpp

@@ -108,10 +108,10 @@ void CodeTransform::operator()(FunctionCall const& _call)
 		visitExpression(arg);
 	m_assembly.setSourceLocation(_call.location);
 	if (m_evm15)
-		m_assembly.appendJumpsub(functionEntryID(*function), function->arguments.size(), function->returns.size());
+		m_assembly.appendJumpsub(functionEntryID(_call.functionName.name, *function), function->arguments.size(), function->returns.size());
 	else
 	{
-		m_assembly.appendJumpTo(functionEntryID(*function), function->returns.size() - function->arguments.size() - 1);
+		m_assembly.appendJumpTo(functionEntryID(_call.functionName.name, *function), function->returns.size() - function->arguments.size() - 1);
 		m_assembly.appendLabel(returnLabel);
 		m_stackAdjustment--;
 	}
@@ -286,12 +286,12 @@ void CodeTransform::operator()(FunctionDefinition const& _function)
 	if (m_evm15)
 	{
 		m_assembly.appendJumpTo(afterFunction, -stackHeightBefore);
-		m_assembly.appendBeginsub(functionEntryID(function), _function.arguments.size());
+		m_assembly.appendBeginsub(functionEntryID(_function.name, function), _function.arguments.size());
 	}
 	else
 	{
 		m_assembly.appendJumpTo(afterFunction, -stackHeightBefore + height);
-		m_assembly.appendLabel(functionEntryID(function));
+		m_assembly.appendLabel(functionEntryID(_function.name, function));
 	}
 	m_stackAdjustment += localStackAdjustment;
 
@@ -303,8 +303,16 @@ void CodeTransform::operator()(FunctionDefinition const& _function)
 		m_assembly.appendConstant(u256(0));
 	}
 
-	CodeTransform(m_assembly, m_info, m_julia, m_evm15, m_identifierAccess, localStackAdjustment, m_context)
-		(_function.body);
+	CodeTransform(
+		m_assembly,
+		m_info,
+		m_julia,
+		m_evm15,
+		m_identifierAccess,
+		m_useNamedLabelsForFunctions,
+		localStackAdjustment,
+		m_context
+	)(_function.body);
 
 	{
 		// The stack layout here is:
@@ -421,10 +429,16 @@ AbstractAssembly::LabelID CodeTransform::labelID(Scope::Label const& _label)
 	return m_context->labelIDs[&_label];
 }
 
-AbstractAssembly::LabelID CodeTransform::functionEntryID(Scope::Function const& _function)
+AbstractAssembly::LabelID CodeTransform::functionEntryID(string const& _name, Scope::Function const& _function)
 {
 	if (!m_context->functionEntryIDs.count(&_function))
-		m_context->functionEntryIDs[&_function] = m_assembly.newLabelId();
+	{
+		AbstractAssembly::LabelID id =
+			m_useNamedLabelsForFunctions ?
+			m_assembly.namedLabel(_name) :
+			m_assembly.newLabelId();
+		m_context->functionEntryIDs[&_function] = id;
+	}
 	return m_context->functionEntryIDs[&_function];
 }
 

libjulia/backends/evm/EVMCodeTransform.h

@@ -50,13 +50,15 @@ public:
 		solidity::assembly::AsmAnalysisInfo& _analysisInfo,
 		bool _julia = false,
 		bool _evm15 = false,
-		ExternalIdentifierAccess const& _identifierAccess = ExternalIdentifierAccess()
+		ExternalIdentifierAccess const& _identifierAccess = ExternalIdentifierAccess(),
+		bool _useNamedLabelsForFunctions = false
 	): CodeTransform(
 		_assembly,
 		_analysisInfo,
 		_julia,
 		_evm15,
 		_identifierAccess,
+		_useNamedLabelsForFunctions,
 		_assembly.stackHeight(),
 		std::make_shared<Context>()
 	)
@@ -78,6 +80,7 @@ protected:
 		bool _julia,
 		bool _evm15,
 		ExternalIdentifierAccess const& _identifierAccess,
+		bool _useNamedLabelsForFunctions,
 		int _stackAdjustment,
 		std::shared_ptr<Context> _context
 	):
@@ -85,6 +88,7 @@ protected:
 		m_info(_analysisInfo),
 		m_julia(_julia),
 		m_evm15(_evm15),
+		m_useNamedLabelsForFunctions(_useNamedLabelsForFunctions),
 		m_identifierAccess(_identifierAccess),
 		m_stackAdjustment(_stackAdjustment),
 		m_context(_context)
@@ -110,7 +114,7 @@ private:
 	/// @returns the label ID corresponding to the given label, allocating a new one if
 	/// necessary.
 	AbstractAssembly::LabelID labelID(solidity::assembly::Scope::Label const& _label);
-	AbstractAssembly::LabelID functionEntryID(solidity::assembly::Scope::Function const& _function);
+	AbstractAssembly::LabelID functionEntryID(std::string const& _name, solidity::assembly::Scope::Function const& _function);
 	/// Generates code for an expression that is supposed to return a single value.
 	void visitExpression(solidity::assembly::Statement const& _expression);
 
@@ -136,6 +140,7 @@ private:
 	solidity::assembly::Scope* m_scope = nullptr;
 	bool m_julia = false;
 	bool m_evm15 = false;
+	bool m_useNamedLabelsForFunctions = false;
 	ExternalIdentifierAccess m_identifierAccess;
 	/// Adjustment between the stack height as determined during the analysis phase
 	/// and the stack height in the assembly. This is caused by an initial stack being present