Introduce global optimiser settings.

libsolidity/interface/OptimiserSettings.h

@@ -0,0 +1,105 @@
+/*
+	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/>.
+*/
+/**
+ * @author Alex Beregszaszi
+ * @date 2017
+ * Helper class for optimiser settings.
+ */
+
+#pragma once
+
+#include <cstddef>
+
+namespace dev
+{
+namespace solidity
+{
+
+struct OptimiserSettings
+{
+	/// No optimisations at all - not recommended.
+	static OptimiserSettings none()
+	{
+		return {};
+	}
+	/// Minimal optimisations: Peephole and jumpdest remover
+	static OptimiserSettings minimal()
+	{
+		OptimiserSettings s = none();
+		s.runJumpdestRemover = true;
+		s.runPeephole = true;
+		return s;
+	}
+	/// Standard optimisations.
+	static OptimiserSettings enabled()
+	{
+		OptimiserSettings s;
+		s.runOrderLiterals = true;
+		s.runJumpdestRemover = true;
+		s.runPeephole = true;
+		s.runDeduplicate = true;
+		s.runCSE = true;
+		s.runConstantOptimiser = true;
+		// The only disabled one
+		s.runYulOptimiser = false;
+		s.expectedExecutionsPerDeployment = 200;
+		return s;
+	}
+	/// Standard optimisations plus yul optimiser.
+	static OptimiserSettings full()
+	{
+		OptimiserSettings s = enabled();
+		s.runYulOptimiser = true;
+		return s;
+	}
+
+	bool operator==(OptimiserSettings const& _other) const
+	{
+		return
+			runOrderLiterals == _other.runOrderLiterals &&
+			runJumpdestRemover == _other.runJumpdestRemover &&
+			runPeephole == _other.runPeephole &&
+			runDeduplicate == _other.runDeduplicate &&
+			runCSE == _other.runCSE &&
+			runConstantOptimiser == _other.runConstantOptimiser &&
+			runYulOptimiser == _other.runYulOptimiser &&
+			expectedExecutionsPerDeployment == _other.expectedExecutionsPerDeployment;
+	}
+
+	/// Move literals to the right of commutative binary operators during code generation.
+	/// This helps exploiting associativity.
+	bool runOrderLiterals = false;
+	/// Non-referenced jump destination remover.
+	bool runJumpdestRemover = false;
+	/// Peephole optimizer
+	bool runPeephole = false;
+	/// Assembly block deduplicator
+	bool runDeduplicate = false;
+	/// Common subexpression eliminator based on assembly items.
+	bool runCSE = false;
+	/// Constant optimizer, which tries to find better representations that satisfy the given
+	/// size/cost-trade-off.
+	bool runConstantOptimiser = false;
+	/// Yul optimiser with default settings. Will only run on certain parts of the code for now.
+	bool runYulOptimiser = false;
+	/// This specifies an estimate on how often each opcode in this assembly will be executed,
+	/// i.e. use a small value to optimise for size and a large value to optimise for runtime gas usage.
+	size_t expectedExecutionsPerDeployment = 200;
+};
+
+}
+}