Merge pull request #7792 from ethereum/enableYulOptimizer

Enable yul optimizer by default.

Changelog.md

@@ -9,6 +9,7 @@ Breaking changes:
  * Command line interface: Switch to the new error reporter by default. ``--old-reporter`` falls back to the deprecated old error reporter.
  * Command line interface: Add option to disable or choose hash method between IPFS and Swarm for the bytecode metadata.
  * General: Disallow explicit conversions from external function types to ``address`` and add a member called ``address`` to them as replacement.
+ * General: Enable Yul optimizer as part of standard optimization.
  * General: New reserved keywords: ``virtual``.
  * General: Split unnamed fallback functions into two cases defined using ``fallback()`` and ``receive()``.
  * Standard JSON Interface: Add option to disable or choose hash method between IPFS and Swarm for the bytecode metadata.

libsolidity/interface/CompilerStack.cpp

@@ -230,12 +230,6 @@ bool CompilerStack::parse()
 	if (SemVerVersion{string(VersionString)}.isPrerelease())
 		m_errorReporter.warning("This is a pre-release compiler version, please do not use it in production.");
 
-	if (m_optimiserSettings.runYulOptimiser)
-		m_errorReporter.warning(
-			"The Yul optimiser is still experimental. "
-			"Do not use it in production unless correctness of generated code is verified with extensive tests."
-		);
-
 	vector<string> sourcesToParse;
 	for (auto const& s: m_sources)
 		sourcesToParse.push_back(s.first);

libsolidity/interface/OptimiserSettings.h

@@ -54,19 +54,15 @@ struct OptimiserSettings
 		s.runDeduplicate = true;
 		s.runCSE = true;
 		s.runConstantOptimiser = true;
-		// The only disabled ones
-		s.optimizeStackAllocation = false;
-		s.runYulOptimiser = false;
+		s.runYulOptimiser = true;
+		s.optimizeStackAllocation = true;
 		s.expectedExecutionsPerDeployment = 200;
 		return s;
 	}
-	/// Standard optimisations plus yul and stack optimiser.
+	/// Full optimisations. Currently an alias for standard optimisations.
 	static OptimiserSettings full()
 	{
-		OptimiserSettings s = standard();
-		s.optimizeStackAllocation = true;
-		s.runYulOptimiser = true;
-		return s;
+		return standard();
 	}
 
 	bool operator==(OptimiserSettings const& _other) const

libsolidity/interface/StandardCompiler.cpp

@@ -481,8 +481,7 @@ boost::variant<OptimiserSettings, Json::Value> parseOptimizerSettings(Json::Valu
 			return *error;
 		if (auto error = checkOptimizerDetail(details, "yul", settings.runYulOptimiser))
 			return *error;
-		if (settings.runYulOptimiser)
-			settings.optimizeStackAllocation = true;
+		settings.optimizeStackAllocation = settings.runYulOptimiser;
 		if (details.isMember("yulDetails"))
 		{
 			if (!settings.runYulOptimiser)

solc/CommandLineInterface.cpp

@@ -136,6 +136,7 @@ static string const g_strMetadataLiteral = "metadata-literal";
 static string const g_strNatspecDev = "devdoc";
 static string const g_strNatspecUser = "userdoc";
 static string const g_strNone = "none";
+static string const g_strNoOptimizeYul = "no-optimize-yul";
 static string const g_strOpcodes = "opcodes";
 static string const g_strOptimize = "optimize";
 static string const g_strOptimizeRuns = "optimize-runs";
@@ -688,7 +689,8 @@ Allowed options)",
 			"Set for how many contract runs to optimize."
 			"Lower values will optimize more for initial deployment cost, higher values will optimize more for high-frequency usage."
 		)
-		(g_strOptimizeYul.c_str(), "Enable Yul optimizer in Solidity, mostly for ABIEncoderV2. Still considered experimental.")
+		(g_strOptimizeYul.c_str(), "Enable Yul optimizer in Solidity. Legacy option: the yul optimizer is enabled as part of the general --optimize option.")
+		(g_strNoOptimizeYul.c_str(), "Disable Yul optimizer in Solidity.")
 		(g_argPrettyJson.c_str(), "Output JSON in pretty format. Currently it only works with the combined JSON output.")
 		(
 			g_argLibraries.c_str(),
@@ -960,7 +962,17 @@ bool CommandLineInterface::processInput()
 		using Machine = yul::AssemblyStack::Machine;
 		Input inputLanguage = m_args.count(g_argYul) ? Input::Yul : (m_args.count(g_argStrictAssembly) ? Input::StrictAssembly : Input::Assembly);
 		Machine targetMachine = Machine::EVM;
-		bool optimize = m_args.count(g_argOptimize) || m_args.count(g_strOptimizeYul);
+		bool optimize = m_args.count(g_argOptimize);
+		if (m_args.count(g_strOptimizeYul))
+		{
+			serr() << "--optimize-yul is invalid in assembly mode. Use --optimize instead." << endl;
+			return false;
+		}
+		if (m_args.count(g_strNoOptimizeYul))
+		{
+			serr() << "--no-optimize-yul is invalid in assembly mode. Optimization is disabled by default and can be enabled with --optimize." << endl;
+			return false;
+		}
 		if (m_args.count(g_argMachine))
 		{
 			string machine = m_args[g_argMachine].as<string>();
@@ -1008,7 +1020,7 @@ bool CommandLineInterface::processInput()
 			return false;
 		}
 		serr() <<
-			"Warning: Yul and its optimizer are still experimental. Please use the output with care." <<
+			"Warning: Yul is still experimental. Please use the output with care." <<
 			endl;
 
 		return assemble(inputLanguage, targetMachine, optimize);
@@ -1065,7 +1077,7 @@ bool CommandLineInterface::processInput()
 
 		OptimiserSettings settings = m_args.count(g_argOptimize) ? OptimiserSettings::standard() : OptimiserSettings::minimal();
 		settings.expectedExecutionsPerDeployment = m_args[g_argOptimizeRuns].as<unsigned>();
-		settings.runYulOptimiser = m_args.count(g_strOptimizeYul);
+		settings.runYulOptimiser = !m_args.count(g_strNoOptimizeYul);
 		settings.optimizeStackAllocation = settings.runYulOptimiser;
 		m_compiler->setOptimiserSettings(settings);
 

test/cmdlineTests/object_compiler/err

@@ -1 +1 @@
-Warning: Yul and its optimizer are still experimental. Please use the output with care.
+Warning: Yul is still experimental. Please use the output with care.

test/cmdlineTests/standard_eWasm_requested/output.json

@@ -60,5 +60,4 @@
 )
 
 )
-"}}}},"errors":[{"component":"general","formattedMessage":"Warning: The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.
-","message":"The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.","severity":"warning","type":"Warning"}],"sources":{"A":{"id":0}}}
+"}}}},"sources":{"A":{"id":0}}}

test/cmdlineTests/standard_optimizer_no_yul/input.json

@@ -0,0 +1,17 @@
+{
+	"language": "Solidity",
+	"sources":
+	{
+		"A":
+		{
+			"content": "pragma solidity >=0.0; contract C { function f() public pure {} }"
+		}
+	},
+	"settings":
+	{
+		"optimizer": {
+			"enabled": true,
+			"details": { "yul": false }
+		}
+	}
+}

test/cmdlineTests/standard_optimizer_no_yul/output.json

@@ -0,0 +1 @@
+{"sources":{"A":{"id":0}}}

test/cmdlineTests/standard_optimizer_yul/input.json

@@ -10,8 +10,7 @@
 	"settings":
 	{
 		"optimizer": {
-			"enabled": true,
-			"details": { "yul": true }
+			"enabled": true
 		}
 	}
 }

test/cmdlineTests/standard_optimizer_yul/output.json

@@ -1,2 +1 @@
-{"errors":[{"component":"general","formattedMessage":"Warning: The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.
-","message":"The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.","severity":"warning","type":"Warning"}],"sources":{"A":{"id":0}}}
+{"sources":{"A":{"id":0}}}

test/cmdlineTests/standard_optimizer_yulDetails/output.json

@@ -1,2 +1 @@
-{"errors":[{"component":"general","formattedMessage":"Warning: The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.
-","message":"The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.","severity":"warning","type":"Warning"}],"sources":{"A":{"id":0}}}
+{"sources":{"A":{"id":0}}}

test/cmdlineTests/strict_asm_jump/err

@@ -1,4 +1,4 @@
-Warning: Yul and its optimizer are still experimental. Please use the output with care.
+Warning: Yul is still experimental. Please use the output with care.
 Error: Function not found.
  --> strict_asm_jump/input.sol:1:3:
   |

test/cmdlineTests/yul_stack_opt/err

@@ -1 +1 @@
-Warning: Yul and its optimizer are still experimental. Please use the output with care.
+Warning: Yul is still experimental. Please use the output with care.

test/cmdlineTests/yul_stack_opt_disabled/err

@@ -1,4 +1,4 @@
-Warning: Yul and its optimizer are still experimental. Please use the output with care.
+Warning: Yul is still experimental. Please use the output with care.
 Exception while assembling:
 Dynamic exception type:
 std::exception::what: Variable a1 is 17 slot(s) too deep inside the stack.

test/libsolidity/StandardCompiler.cpp

@@ -1042,12 +1042,6 @@ BOOST_AUTO_TEST_CASE(optimizer_settings_details_different)
 	)";
 	Json::Value result = compile(input);
 	BOOST_CHECK(containsAtMostWarnings(result));
-	BOOST_CHECK(containsError(
-		result,
-		"Warning",
-		"The Yul optimiser is still experimental. "
-		"Do not use it in production unless correctness of generated code is verified with extensive tests."
-	));
 	Json::Value contract = getContractResult(result, "fileA", "A");
 	BOOST_CHECK(contract.isObject());
 	BOOST_CHECK(contract["metadata"].isString());

test/libsolidity/SyntaxTest.cpp

@@ -63,10 +63,18 @@ SyntaxTest::SyntaxTest(string const& _filename, langutil::EVMVersion _evmVersion
 
 	if (m_settings.count("optimize-yul"))
 	{
-		m_optimiseYul = true;
+		if (m_settings["optimize-yul"] == "true")
+		{
 			m_validatedSettings["optimize-yul"] = "true";
 			m_settings.erase("optimize-yul");
 		}
+		else if (m_settings["optimize-yul"] == "false")
+		{
+			m_validatedSettings["optimize-yul"] = "false";
+			m_settings.erase("optimize-yul");
+			m_optimiseYul = false;
+		}
+	}
 	m_expectations = parseExpectations(file);
 	m_parserErrorRecovery = _parserErrorRecovery;
 }

test/libsolidity/SyntaxTest.h

@@ -90,7 +90,7 @@ protected:
 	std::map<std::string, std::string> m_sources;
 	std::vector<SyntaxTestError> m_expectations;
 	std::vector<SyntaxTestError> m_errorList;
-	bool m_optimiseYul = false;
+	bool m_optimiseYul = true;
 	langutil::EVMVersion const m_evmVersion;
 	bool m_parserErrorRecovery = false;
 };

test/libsolidity/syntaxTests/inlineAssembly/use_msize_with_optimizer.sol

@@ -8,5 +8,4 @@ contract C {
 // ====
 // optimize-yul: true
 // ----
-// Warning: The Yul optimiser is still experimental. Do not use it in production unless correctness of generated code is verified with extensive tests.
 // SyntaxError: (52-101): The msize instruction cannot be used when the Yul optimizer is activated because it can change its semantics. Either disable the Yul optimizer or do not use the instruction.

test/libsolidity/syntaxTests/inlineAssembly/use_msize_without_optimizer.sol

@@ -5,4 +5,6 @@ contract C {
         }
     }
 }
+// ====
+// optimize-yul: false
 // ----