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authorDimitry <winsvega@mail.ru>2016-03-21 16:55:45 +0800
committerDimitry <winsvega@mail.ru>2016-03-21 16:55:45 +0800
commitb50e65437ebad535af29e84156b8b1af71f61c3d (patch)
treef2594fc7b539e5848f4fc08ebcfafedab90e00b5 /libevmasm/SemanticInformation.h
parent2fe6037b9bc42946dafbf0f870ca59546712d14c (diff)
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+/*
+ This file is part of cpp-ethereum.
+
+ cpp-ethereum 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.
+
+ cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @file SemanticInformation.h
+ * @author Christian <c@ethdev.com>
+ * @date 2015
+ * Helper to provide semantic information about assembly items.
+ */
+
+#pragma once
+
+#include <libevmcore/Instruction.h>
+
+namespace dev
+{
+namespace eth
+{
+
+class AssemblyItem;
+
+/**
+ * Helper functions to provide context-independent information about assembly items.
+ */
+struct SemanticInformation
+{
+ /// @returns true if the given items starts a new block for common subexpression analysis.
+ static bool breaksCSEAnalysisBlock(AssemblyItem const& _item);
+ /// @returns true if the item is a two-argument operation whose value does not depend on the
+ /// order of its arguments.
+ static bool isCommutativeOperation(AssemblyItem const& _item);
+ static bool isDupInstruction(AssemblyItem const& _item);
+ static bool isSwapInstruction(AssemblyItem const& _item);
+ static bool isJumpInstruction(AssemblyItem const& _item);
+ static bool altersControlFlow(AssemblyItem const& _item);
+ /// @returns false if the value put on the stack by _item depends on anything else than
+ /// the information in the current block header, memory, storage or stack.
+ static bool isDeterministic(AssemblyItem const& _item);
+ /// @returns true if the given instruction modifies memory.
+ static bool invalidatesMemory(Instruction _instruction);
+ /// @returns true if the given instruction modifies storage (even indirectly).
+ static bool invalidatesStorage(Instruction _instruction);
+};
+
+}
+}