mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
78 lines
3.5 KiB
C++
78 lines
3.5 KiB
C++
/*
|
|
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/>.
|
|
*/
|
|
/**
|
|
* @file SemanticInformation.h
|
|
* @author Christian <c@ethdev.com>
|
|
* @date 2015
|
|
* Helper to provide semantic information about assembly items.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <libevmasm/Instruction.h>
|
|
|
|
namespace solidity::evmasm
|
|
{
|
|
|
|
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.
|
|
/// @param _msizeImportant if false, consider an operation non-breaking if its only side-effect is that it modifies msize.
|
|
static bool breaksCSEAnalysisBlock(AssemblyItem const& _item, bool _msizeImportant);
|
|
/// @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);
|
|
static bool terminatesControlFlow(AssemblyItem const& _item);
|
|
static bool terminatesControlFlow(Instruction _instruction);
|
|
static bool reverts(AssemblyItem const& _item);
|
|
static bool reverts(Instruction _instruction);
|
|
/// @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 instruction can be moved or copied (together with its arguments)
|
|
/// without altering the semantics. This means it cannot depend on storage or memory,
|
|
/// cannot have any side-effects, but it can depend on a call-constant state of the blockchain.
|
|
static bool movable(Instruction _instruction);
|
|
/// @returns true if the instruction can be removed without changing the semantics.
|
|
/// This does not mean that it has to be deterministic or retrieve information from
|
|
/// somewhere else than purely the values of its arguments.
|
|
static bool sideEffectFree(Instruction _instruction);
|
|
/// @returns true if the instruction can be removed without changing the semantics.
|
|
/// This does not mean that it has to be deterministic or retrieve information from
|
|
/// somewhere else than purely the values of its arguments.
|
|
/// If true, the instruction is still allowed to influence the value returned by the
|
|
/// msize instruction.
|
|
static bool sideEffectFreeIfNoMSize(Instruction _instruction);
|
|
/// @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);
|
|
static bool invalidInPureFunctions(Instruction _instruction);
|
|
static bool invalidInViewFunctions(Instruction _instruction);
|
|
};
|
|
|
|
}
|