|
|
|
|
/*
|
|
|
|
|
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);
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
