[yul-phaser] Add Chromosome class

tools/CMakeLists.txt

@@ -15,6 +15,8 @@ install(TARGETS solidity-upgrade DESTINATION "${CMAKE_INSTALL_BINDIR}")
 
 add_executable(yul-phaser
 	yulPhaser/main.cpp
+	yulPhaser/Chromosome.h
+	yulPhaser/Chromosome.cpp
 	yulPhaser/Program.h
 	yulPhaser/Program.cpp
 	yulPhaser/Random.h

tools/yulPhaser/Chromosome.cpp

@@ -0,0 +1,112 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <tools/yulPhaser/Chromosome.h>
+
+#include <tools/yulPhaser/Random.h>
+
+#include <libyul/optimiser/Suite.h>
+#include <libsolutil/CommonData.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace solidity;
+using namespace solidity::util;
+using namespace solidity::yul;
+using namespace solidity::phaser;
+
+namespace solidity::phaser
+{
+
+ostream& operator<<(ostream& _stream, Chromosome const& _chromosome);
+
+}
+
+Chromosome Chromosome::makeRandom(size_t _length)
+{
+	vector<string> steps;
+	for (size_t i = 0; i < _length; ++i)
+		steps.push_back(randomOptimisationStep());
+
+	return Chromosome(move(steps));
+}
+
+ostream& phaser::operator<<(ostream& _stream, Chromosome const& _chromosome)
+{
+	for (auto const& stepName: _chromosome.m_optimisationSteps)
+		_stream << OptimiserSuite::stepNameToAbbreviationMap().at(stepName);
+
+	return _stream;
+}
+
+vector<string> Chromosome::allStepNames()
+{
+	vector<string> stepNames;
+	for (auto const& step: OptimiserSuite::allSteps())
+		stepNames.push_back(step.first);
+
+	return stepNames;
+}
+
+vector<string> Chromosome::allStepNamesExcept(vector<string> const& _excludedStepNames)
+{
+	// This is not very efficient but vectors are small and the caller will cache the results anyway.
+	// What matters a bit more is that using vector rather than a set gives us O(1) access to
+	// random elements in other functions.
+	return convertContainer<vector<string>>(
+		convertContainer<set<string>>(allStepNames()) -
+		convertContainer<set<string>>(_excludedStepNames)
+	);
+}
+
+string const& Chromosome::randomOptimisationStep()
+{
+	static vector<string> stepNames = allStepNamesExcept({
+		// All possible steps, listed and commented-out for easy tweaking.
+		// The uncommented ones are not used (possibly because they fail).
+		//{BlockFlattener::name},
+		//{CommonSubexpressionEliminator::name},
+		//{ConditionalSimplifier::name},
+		//{ConditionalUnsimplifier::name},
+		//{ControlFlowSimplifier::name},
+		//{DeadCodeEliminator::name},
+		//{EquivalentFunctionCombiner::name},
+		//{ExpressionInliner::name},
+		//{ExpressionJoiner::name},
+		//{ExpressionSimplifier::name},
+		//{ExpressionSplitter::name},
+		//{ForLoopConditionIntoBody::name},
+		//{ForLoopConditionOutOfBody::name},
+		//{ForLoopInitRewriter::name},
+		//{FullInliner::name},
+		//{FunctionGrouper::name},
+		//{FunctionHoister::name},
+		//{LiteralRematerialiser::name},
+		//{LoadResolver::name},
+		//{LoopInvariantCodeMotion::name},
+		//{RedundantAssignEliminator::name},
+		//{Rematerialiser::name},
+		//{SSAReverser::name},
+		//{SSATransform::name},
+		//{StructuralSimplifier::name},
+		//{UnusedPruner::name},
+		//{VarDeclInitializer::name},
+	});
+
+	return stepNames[uniformRandomInt(0, stepNames.size() - 1)];
+}

tools/yulPhaser/Chromosome.h

@@ -0,0 +1,65 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <map>
+#include <ostream>
+#include <string>
+#include <vector>
+
+namespace solidity::phaser
+{
+
+/**
+ * An object that represents a sequence of optimiser steps that can be applied to a program.
+ * Such sequences are used in our genetic algorithm to represent individual members of the
+ * population.
+ *
+ * To calculate the fitness of an individual one must apply its sequence to a specific program.
+ * This class does not provide any means to do so. It just stores information.
+ *
+ * Once created a sequence cannot be changed. The only way to mutate it is to generate a new
+ * chromosome based on the old one.
+ */
+class Chromosome
+{
+public:
+	Chromosome() = default;
+	explicit Chromosome(std::vector<std::string> _optimisationSteps):
+		m_optimisationSteps(std::move(_optimisationSteps)) {}
+	static Chromosome makeRandom(size_t _length);
+
+	size_t length() const { return m_optimisationSteps.size(); }
+	std::vector<std::string> const& optimisationSteps() const { return m_optimisationSteps; }
+
+	friend std::ostream& operator<<(std::ostream& _stream, Chromosome const& _chromosome);
+
+	bool operator==(Chromosome const& _other) const { return m_optimisationSteps == _other.m_optimisationSteps; }
+	bool operator!=(Chromosome const& _other) const { return !(*this == _other); }
+
+private:
+	static std::vector<std::string> allStepNames();
+	static std::vector<std::string> allStepNamesExcept(
+		std::vector<std::string> const& _excludedStepNames
+	);
+	static std::string const& randomOptimisationStep();
+
+	std::vector<std::string> m_optimisationSteps;
+};
+
+}

tools/yulPhaser/main.cpp

@@ -15,6 +15,7 @@
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <tools/yulPhaser/Chromosome.h>
 #include <tools/yulPhaser/Exceptions.h>
 #include <tools/yulPhaser/Program.h>
 
@@ -39,8 +40,8 @@ struct CommandLineParsingResult
 
 void runAlgorithm(string const& _sourcePath)
 {
-	Program::load(_sourcePath);
+	Program::load(_sourcePath).optimize(Chromosome::makeRandom(15).asSequence());
-	cout << "Program load successful." << endl;
+	cout << "Program load and optimization successful." << endl;
 }
 
 CommandLineParsingResult parseCommandLine(int argc, char** argv)