mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Yul interpreter module that evaluates EVM instructions.
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*/
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#pragma once
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#include <libyul/AsmDataForward.h>
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#include <libdevcore/CommonData.h>
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#include <vector>
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namespace dev
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{
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namespace solidity
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{
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enum class Instruction: uint8_t;
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}
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}
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namespace yul
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{
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namespace test
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{
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struct InterpreterState;
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/**
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* Interprets EVM instructions based on the current state and logs instructions with
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* side-effects.
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*
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* Since this is mainly meant to be used for differential fuzz testing, it is focused
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* on a single contract only, does not do any gas counting and differs from the correct
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* implementation in many ways:
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*
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* - If memory access to a "large" memory position is performed, a deterministic
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* value is returned. Data that is stored in a "large" memory position is not
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* retained.
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* - The blockhash instruction returns a fixed value if the argument is in range.
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* - Extcodesize returns a deterministic value depending on the address.
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* - Extcodecopy copies a deterministic value depending on the address.
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* - And many other things
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*
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* The main focus is that the generated execution trace is the same for equivalent executions
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* and likely to be different for non-equivalent executions.
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*/
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class EVMInstructionInterpreter
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{
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public:
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explicit EVMInstructionInterpreter(InterpreterState& _state):
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m_state(_state)
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{}
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dev::u256 eval(dev::solidity::Instruction _instruction, std::vector<dev::u256> const& _arguments);
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private:
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/// Record a memory read in the trace. Also updates m_state.msize
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/// @returns true if m_state.memory can be used at that offset.
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bool logMemoryRead(dev::u256 const& _offset, dev::u256 const& _size = 32);
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/// Record a memory write in the trace. Also updates m_state.msize
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/// @returns true if m_state.memory can be used at that offset.
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bool logMemoryWrite(dev::u256 const& _offset, dev::u256 const& _size = 32, dev::bytes const& _data = {});
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bool logMemory(bool _write, dev::u256 const& _offset, dev::u256 const& _size = 32, dev::bytes const& _data = {});
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void logTrace(dev::solidity::Instruction _instruction, std::vector<dev::u256> const& _arguments = {}, dev::bytes const& _data = {});
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/// Appends a log to the trace representing an instruction or similar operation by string,
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/// with arguments and auxiliary data (if nonempty).
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void logTrace(std::string const& _pseudoInstruction, std::vector<dev::u256> const& _arguments = {}, dev::bytes const& _data = {});
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InterpreterState& m_state;
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};
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}
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}
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