solidity/test/tools/yulInterpreter/EVMInstructionInterpreter.h

131 lines
4.3 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/>.
*/
// SPDX-License-Identifier: GPL-3.0
/**
* Yul interpreter module that evaluates EVM instructions.
*/
#pragma once
#include <libyul/ASTForward.h>
#include <libsolutil/CommonData.h>
#include <libsolutil/Numeric.h>
#include <vector>
namespace solidity::evmasm
{
enum class Instruction: uint8_t;
}
namespace solidity::yul
{
class YulString;
struct BuiltinFunctionForEVM;
}
namespace solidity::yul::test
{
/// Copy @a _size bytes of @a _source at offset @a _sourceOffset to
/// @a _target at offset @a _targetOffset. Behaves as if @a _source would
/// continue with an infinite sequence of zero bytes beyond its end.
void copyZeroExtended(
std::map<u256, uint8_t>& _target, bytes const& _source,
size_t _targetOffset, size_t _sourceOffset, size_t _size
);
struct InterpreterState;
/**
* Interprets EVM instructions based on the current state and logs instructions with
* side-effects.
*
* Since this is mainly meant to be used for differential fuzz testing, it is focused
* on a single contract only, does not do any gas counting and differs from the correct
* implementation in many ways:
*
* - If memory access to a "large" memory position is performed, a deterministic
* value is returned. Data that is stored in a "large" memory position is not
* retained.
* - The blockhash instruction returns a fixed value if the argument is in range.
* - Extcodesize returns a deterministic value depending on the address.
* - Extcodecopy copies a deterministic value depending on the address.
* - And many other things
*
* The main focus is that the generated execution trace is the same for equivalent executions
* and likely to be different for non-equivalent executions.
*/
class EVMInstructionInterpreter
{
public:
explicit EVMInstructionInterpreter(InterpreterState& _state, bool _disableMemWriteTrace):
m_state(_state),
m_disableMemoryWriteInstructions(_disableMemWriteTrace)
{}
/// Evaluate instruction
u256 eval(evmasm::Instruction _instruction, std::vector<u256> const& _arguments);
/// Evaluate builtin function
u256 evalBuiltin(
BuiltinFunctionForEVM const& _fun,
std::vector<Expression> const& _arguments,
std::vector<u256> const& _evaluatedArguments
);
private:
/// Checks if the memory access is not too large for the interpreter and adjusts
/// msize accordingly.
/// @returns false if the amount of bytes read is lager than 0xffff
bool accessMemory(u256 const& _offset, u256 const& _size = 32);
/// @returns the memory contents at the provided address.
/// Does not adjust msize, use @a accessMemory for that
bytes readMemory(u256 const& _offset, u256 const& _size = 32);
/// @returns the memory contents at the provided address.
/// Does not adjust msize, use @a accessMemory for that
u256 readMemoryWord(u256 const& _offset);
/// @returns writes a word to memory
/// Does not adjust msize, use @a accessMemory for that
void writeMemoryWord(u256 const& _offset, u256 const& _value);
void logTrace(
evmasm::Instruction _instruction,
std::vector<u256> const& _arguments = {},
bytes const& _data = {}
);
/// Appends a log to the trace representing an instruction or similar operation by string,
/// with arguments and auxiliary data (if nonempty). Flag @param _writesToMemory indicates
/// whether the instruction writes to (true) or does not write to (false) memory.
void logTrace(
std::string const& _pseudoInstruction,
bool _writesToMemory,
std::vector<u256> const& _arguments = {},
bytes const& _data = {}
);
/// @returns disable trace flag.
bool memWriteTracingDisabled()
{
return m_disableMemoryWriteInstructions;
}
InterpreterState& m_state;
/// Flag to disable trace of instructions that write to memory.
bool m_disableMemoryWriteInstructions;
};
} // solidity::yul::test