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696 lines
19 KiB
696 lines
19 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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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cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file VM.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <unordered_map>
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#include <libdevcore/Exceptions.h>
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#include <libethcore/CommonEth.h>
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#include <libevmface/Instruction.h>
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#include <libdevcrypto/SHA3.h>
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#include <libethcore/BlockInfo.h>
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#include "FeeStructure.h"
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#include "ExtVMFace.h"
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namespace dev
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{
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namespace eth
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{
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struct VMException: virtual Exception {};
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struct StepsDone: virtual VMException {};
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struct BreakPointHit: virtual VMException {};
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struct BadInstruction: virtual VMException {};
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struct OutOfGas: virtual VMException {};
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class StackTooSmall: public VMException { public: StackTooSmall(u256 _req, u256 _got): req(_req), got(_got) {} u256 req; u256 got; };
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// Convert from a 256-bit integer stack/memory entry into a 160-bit Address hash.
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// Currently we just pull out the right (low-order in BE) 160-bits.
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inline Address asAddress(u256 _item)
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{
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return right160(h256(_item));
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}
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inline u256 fromAddress(Address _a)
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{
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return (u160)_a;
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// h256 ret;
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// memcpy(&ret, &_a, sizeof(_a));
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// return ret;
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}
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/**
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*/
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class VM
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{
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public:
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/// Construct VM object.
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explicit VM(u256 _gas = 0) { reset(_gas); }
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void reset(u256 _gas = 0);
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template <class Ext>
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bytesConstRef go(Ext& _ext, OnOpFunc const& _onOp = OnOpFunc(), uint64_t _steps = (uint64_t)-1);
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void require(u256 _n) { if (m_stack.size() < _n) BOOST_THROW_EXCEPTION(StackTooSmall(_n, m_stack.size())); }
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void requireMem(unsigned _n) { if (m_temp.size() < _n) { m_temp.resize(_n); } }
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u256 gas() const { return m_gas; }
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u256 curPC() const { return m_curPC; }
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bytes const& memory() const { return m_temp; }
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u256s const& stack() const { return m_stack; }
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private:
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u256 m_gas = 0;
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u256 m_curPC = 0;
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bytes m_temp;
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u256s m_stack;
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};
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}
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// INLINE:
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template <class Ext> dev::bytesConstRef dev::eth::VM::go(Ext& _ext, OnOpFunc const& _onOp, uint64_t _steps)
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{
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auto memNeed = [](dev::u256 _offset, dev::u256 _size) { return _size ? _offset + _size : 0; };
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u256 nextPC = m_curPC + 1;
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auto osteps = _steps;
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for (bool stopped = false; !stopped && _steps--; m_curPC = nextPC, nextPC = m_curPC + 1)
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{
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// INSTRUCTION...
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Instruction inst = (Instruction)_ext.getCode(m_curPC);
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// FEES...
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bigint runGas = c_stepGas;
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bigint newTempSize = m_temp.size();
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switch (inst)
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{
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case Instruction::STOP:
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runGas = 0;
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break;
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case Instruction::SUICIDE:
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runGas = 0;
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break;
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case Instruction::SSTORE:
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require(2);
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if (!_ext.store(m_stack.back()) && m_stack[m_stack.size() - 2])
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runGas = c_sstoreGas * 2;
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else if (_ext.store(m_stack.back()) && !m_stack[m_stack.size() - 2])
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runGas = 0;
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else
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runGas = c_sstoreGas;
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break;
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case Instruction::SLOAD:
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runGas = c_sloadGas;
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break;
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// These all operate on memory and therefore potentially expand it:
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case Instruction::MSTORE:
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require(2);
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newTempSize = m_stack.back() + 32;
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break;
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case Instruction::MSTORE8:
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require(2);
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newTempSize = m_stack.back() + 1;
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break;
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case Instruction::MLOAD:
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require(1);
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newTempSize = m_stack.back() + 32;
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break;
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case Instruction::RETURN:
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require(2);
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newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 2]);
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break;
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case Instruction::SHA3:
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require(2);
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runGas = c_sha3Gas;
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newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 2]);
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break;
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case Instruction::CALLDATACOPY:
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require(3);
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newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 3]);
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break;
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case Instruction::CODECOPY:
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require(3);
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newTempSize = memNeed(m_stack.back(), m_stack[m_stack.size() - 3]);
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break;
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case Instruction::EXTCODECOPY:
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require(4);
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newTempSize = memNeed(m_stack[m_stack.size() - 2], m_stack[m_stack.size() - 4]);
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break;
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case Instruction::BALANCE:
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runGas = c_balanceGas;
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break;
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case Instruction::CALL:
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require(7);
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runGas = c_callGas + m_stack[m_stack.size() - 1];
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newTempSize = std::max(memNeed(m_stack[m_stack.size() - 6], m_stack[m_stack.size() - 7]), memNeed(m_stack[m_stack.size() - 4], m_stack[m_stack.size() - 5]));
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break;
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case Instruction::CALLSTATELESS:
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require(7);
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runGas = c_callGas + m_stack[m_stack.size() - 1];
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newTempSize = std::max(memNeed(m_stack[m_stack.size() - 6], m_stack[m_stack.size() - 7]), memNeed(m_stack[m_stack.size() - 4], m_stack[m_stack.size() - 5]));
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break;
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case Instruction::POST:
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require(5);
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runGas = c_callGas + m_stack[m_stack.size() - 1];
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newTempSize = memNeed(m_stack[m_stack.size() - 4], m_stack[m_stack.size() - 5]);
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break;
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case Instruction::CREATE:
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{
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require(3);
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auto inOff = m_stack[m_stack.size() - 2];
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auto inSize = m_stack[m_stack.size() - 3];
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newTempSize = inOff + inSize;
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runGas = c_createGas;
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break;
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}
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default:
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break;
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}
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newTempSize = (newTempSize + 31) / 32 * 32;
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if (newTempSize > m_temp.size())
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runGas += c_memoryGas * (newTempSize - m_temp.size()) / 32;
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if (_onOp)
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_onOp(osteps - _steps - 1, inst, newTempSize > m_temp.size() ? (newTempSize - m_temp.size()) / 32 : bigint(0), runGas, this, &_ext);
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if (m_gas < runGas)
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{
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// Out of gas!
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m_gas = 0;
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BOOST_THROW_EXCEPTION(OutOfGas());
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}
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m_gas = (u256)((bigint)m_gas - runGas);
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if (newTempSize > m_temp.size())
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m_temp.resize((size_t)newTempSize);
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// EXECUTE...
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switch (inst)
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{
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case Instruction::ADD:
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//pops two items and pushes S[-1] + S[-2] mod 2^256.
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require(2);
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m_stack[m_stack.size() - 2] += m_stack.back();
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m_stack.pop_back();
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break;
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case Instruction::MUL:
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//pops two items and pushes S[-1] * S[-2] mod 2^256.
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require(2);
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m_stack[m_stack.size() - 2] *= m_stack.back();
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m_stack.pop_back();
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break;
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case Instruction::SUB:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() - m_stack[m_stack.size() - 2];
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m_stack.pop_back();
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break;
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case Instruction::DIV:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack[m_stack.size() - 2] ? m_stack.back() / m_stack[m_stack.size() - 2] : 0;
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m_stack.pop_back();
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break;
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case Instruction::SDIV:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack[m_stack.size() - 2] ? s2u(u2s(m_stack.back()) / u2s(m_stack[m_stack.size() - 2])) : 0;
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m_stack.pop_back();
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break;
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case Instruction::MOD:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack[m_stack.size() - 2] ? m_stack.back() % m_stack[m_stack.size() - 2] : 0;
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m_stack.pop_back();
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break;
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case Instruction::SMOD:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack[m_stack.size() - 2] ? s2u(u2s(m_stack.back()) % u2s(m_stack[m_stack.size() - 2])) : 0;
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m_stack.pop_back();
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break;
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case Instruction::EXP:
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{
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require(2);
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auto base = m_stack.back();
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auto expon = m_stack[m_stack.size() - 2];
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m_stack.pop_back();
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m_stack.back() = (u256)boost::multiprecision::powm((bigint)base, (bigint)expon, bigint(2) << 256);
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break;
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}
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case Instruction::NEG:
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require(1);
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m_stack.back() = ~(m_stack.back() - 1);
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break;
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case Instruction::LT:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() < m_stack[m_stack.size() - 2] ? 1 : 0;
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m_stack.pop_back();
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break;
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case Instruction::GT:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() > m_stack[m_stack.size() - 2] ? 1 : 0;
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m_stack.pop_back();
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break;
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case Instruction::SLT:
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require(2);
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m_stack[m_stack.size() - 2] = u2s(m_stack.back()) < u2s(m_stack[m_stack.size() - 2]) ? 1 : 0;
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m_stack.pop_back();
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break;
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case Instruction::SGT:
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require(2);
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m_stack[m_stack.size() - 2] = u2s(m_stack.back()) > u2s(m_stack[m_stack.size() - 2]) ? 1 : 0;
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m_stack.pop_back();
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break;
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case Instruction::EQ:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() == m_stack[m_stack.size() - 2] ? 1 : 0;
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m_stack.pop_back();
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break;
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case Instruction::NOT:
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require(1);
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m_stack.back() = m_stack.back() ? 0 : 1;
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break;
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case Instruction::AND:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() & m_stack[m_stack.size() - 2];
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m_stack.pop_back();
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break;
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case Instruction::OR:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() | m_stack[m_stack.size() - 2];
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m_stack.pop_back();
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break;
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case Instruction::XOR:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() ^ m_stack[m_stack.size() - 2];
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m_stack.pop_back();
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break;
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case Instruction::BYTE:
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require(2);
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m_stack[m_stack.size() - 2] = m_stack.back() < 32 ? (m_stack[m_stack.size() - 2] >> (unsigned)(8 * (31 - m_stack.back()))) & 0xff : 0;
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m_stack.pop_back();
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break;
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case Instruction::ADDMOD:
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require(3);
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m_stack[m_stack.size() - 3] = u256((bigint(m_stack.back()) + bigint(m_stack[m_stack.size() - 2])) % m_stack[m_stack.size() - 3]);
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m_stack.pop_back();
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m_stack.pop_back();
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break;
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case Instruction::MULMOD:
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require(3);
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m_stack[m_stack.size() - 3] = u256((bigint(m_stack.back()) * bigint(m_stack[m_stack.size() - 2])) % m_stack[m_stack.size() - 3]);
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m_stack.pop_back();
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m_stack.pop_back();
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break;
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case Instruction::SHA3:
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{
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require(2);
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unsigned inOff = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned inSize = (unsigned)m_stack.back();
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m_stack.pop_back();
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m_stack.push_back(sha3(bytesConstRef(m_temp.data() + inOff, inSize)));
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break;
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}
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case Instruction::ADDRESS:
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m_stack.push_back(fromAddress(_ext.myAddress));
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break;
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case Instruction::ORIGIN:
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m_stack.push_back(fromAddress(_ext.origin));
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break;
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case Instruction::BALANCE:
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{
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require(1);
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m_stack.back() = _ext.balance(asAddress(m_stack.back()));
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break;
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}
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case Instruction::CALLER:
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m_stack.push_back(fromAddress(_ext.caller));
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break;
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case Instruction::CALLVALUE:
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m_stack.push_back(_ext.value);
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break;
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case Instruction::CALLDATALOAD:
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{
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require(1);
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if ((unsigned)m_stack.back() + 31 < _ext.data.size())
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m_stack.back() = (u256)*(h256 const*)(_ext.data.data() + (unsigned)m_stack.back());
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else
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{
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h256 r;
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for (unsigned i = (unsigned)m_stack.back(), e = (unsigned)m_stack.back() + 32, j = 0; i < e; ++i, ++j)
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r[j] = i < _ext.data.size() ? _ext.data[i] : 0;
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m_stack.back() = (u256)r;
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}
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break;
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}
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case Instruction::CALLDATASIZE:
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m_stack.push_back(_ext.data.size());
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break;
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case Instruction::CALLDATACOPY:
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{
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require(3);
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unsigned mf = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned cf = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned l = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned el = cf + l > _ext.data.size() ? _ext.data.size() < cf ? 0 : _ext.data.size() - cf : l;
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memcpy(m_temp.data() + mf, _ext.data.data() + cf, el);
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memset(m_temp.data() + mf + el, 0, l - el);
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break;
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}
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case Instruction::CODESIZE:
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m_stack.push_back(_ext.code.size());
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break;
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case Instruction::CODECOPY:
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{
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require(3);
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unsigned mf = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned cf = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned l = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned el = cf + l > _ext.code.size() ? _ext.code.size() < cf ? 0 : _ext.code.size() - cf : l;
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memcpy(m_temp.data() + mf, _ext.code.data() + cf, el);
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memset(m_temp.data() + mf + el, 0, l - el);
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break;
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}
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case Instruction::EXTCODESIZE:
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require(1);
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m_stack.back() = _ext.codeAt(asAddress(m_stack.back())).size();
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break;
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case Instruction::EXTCODECOPY:
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{
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require(4);
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Address a = asAddress(m_stack.back());
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m_stack.pop_back();
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unsigned mf = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned cf = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned l = (unsigned)m_stack.back();
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m_stack.pop_back();
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unsigned el = cf + l > _ext.codeAt(a).size() ? _ext.codeAt(a).size() < cf ? 0 : _ext.codeAt(a).size() - cf : l;
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memcpy(m_temp.data() + mf, _ext.codeAt(a).data() + cf, el);
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memset(m_temp.data() + mf + el, 0, l - el);
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break;
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}
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case Instruction::GASPRICE:
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m_stack.push_back(_ext.gasPrice);
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break;
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case Instruction::PREVHASH:
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m_stack.push_back(_ext.previousBlock.hash);
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break;
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case Instruction::COINBASE:
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m_stack.push_back((u160)_ext.currentBlock.coinbaseAddress);
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break;
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case Instruction::TIMESTAMP:
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m_stack.push_back(_ext.currentBlock.timestamp);
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break;
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case Instruction::NUMBER:
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m_stack.push_back(_ext.currentBlock.number);
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break;
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case Instruction::DIFFICULTY:
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m_stack.push_back(_ext.currentBlock.difficulty);
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break;
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case Instruction::GASLIMIT:
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m_stack.push_back(1000000);
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break;
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case Instruction::PUSH1:
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case Instruction::PUSH2:
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case Instruction::PUSH3:
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case Instruction::PUSH4:
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case Instruction::PUSH5:
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case Instruction::PUSH6:
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case Instruction::PUSH7:
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case Instruction::PUSH8:
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case Instruction::PUSH9:
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case Instruction::PUSH10:
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case Instruction::PUSH11:
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case Instruction::PUSH12:
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case Instruction::PUSH13:
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case Instruction::PUSH14:
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case Instruction::PUSH15:
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case Instruction::PUSH16:
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case Instruction::PUSH17:
|
|
case Instruction::PUSH18:
|
|
case Instruction::PUSH19:
|
|
case Instruction::PUSH20:
|
|
case Instruction::PUSH21:
|
|
case Instruction::PUSH22:
|
|
case Instruction::PUSH23:
|
|
case Instruction::PUSH24:
|
|
case Instruction::PUSH25:
|
|
case Instruction::PUSH26:
|
|
case Instruction::PUSH27:
|
|
case Instruction::PUSH28:
|
|
case Instruction::PUSH29:
|
|
case Instruction::PUSH30:
|
|
case Instruction::PUSH31:
|
|
case Instruction::PUSH32:
|
|
{
|
|
int i = (int)inst - (int)Instruction::PUSH1 + 1;
|
|
nextPC = m_curPC + 1;
|
|
m_stack.push_back(0);
|
|
for (; i--; nextPC++)
|
|
m_stack.back() = (m_stack.back() << 8) | _ext.getCode(nextPC);
|
|
break;
|
|
}
|
|
case Instruction::POP:
|
|
require(1);
|
|
m_stack.pop_back();
|
|
break;
|
|
case Instruction::DUP1:
|
|
case Instruction::DUP2:
|
|
case Instruction::DUP3:
|
|
case Instruction::DUP4:
|
|
case Instruction::DUP5:
|
|
case Instruction::DUP6:
|
|
case Instruction::DUP7:
|
|
case Instruction::DUP8:
|
|
case Instruction::DUP9:
|
|
case Instruction::DUP10:
|
|
case Instruction::DUP11:
|
|
case Instruction::DUP12:
|
|
case Instruction::DUP13:
|
|
case Instruction::DUP14:
|
|
case Instruction::DUP15:
|
|
case Instruction::DUP16:
|
|
{
|
|
auto n = 1 + (int)inst - (int)Instruction::DUP1;
|
|
require(n);
|
|
m_stack.push_back(m_stack[m_stack.size() - n]);
|
|
break;
|
|
}
|
|
case Instruction::SWAP1:
|
|
case Instruction::SWAP2:
|
|
case Instruction::SWAP3:
|
|
case Instruction::SWAP4:
|
|
case Instruction::SWAP5:
|
|
case Instruction::SWAP6:
|
|
case Instruction::SWAP7:
|
|
case Instruction::SWAP8:
|
|
case Instruction::SWAP9:
|
|
case Instruction::SWAP10:
|
|
case Instruction::SWAP11:
|
|
case Instruction::SWAP12:
|
|
case Instruction::SWAP13:
|
|
case Instruction::SWAP14:
|
|
case Instruction::SWAP15:
|
|
case Instruction::SWAP16:
|
|
{
|
|
unsigned n = (int)inst - (int)Instruction::SWAP1 + 2;
|
|
require(n);
|
|
auto d = m_stack.back();
|
|
m_stack.back() = m_stack[m_stack.size() - n];
|
|
m_stack[m_stack.size() - n] = d;
|
|
break;
|
|
}
|
|
case Instruction::MLOAD:
|
|
{
|
|
require(1);
|
|
m_stack.back() = (u256)*(h256 const*)(m_temp.data() + (unsigned)m_stack.back());
|
|
break;
|
|
}
|
|
case Instruction::MSTORE:
|
|
{
|
|
require(2);
|
|
*(h256*)&m_temp[(unsigned)m_stack.back()] = (h256)m_stack[m_stack.size() - 2];
|
|
m_stack.pop_back();
|
|
m_stack.pop_back();
|
|
break;
|
|
}
|
|
case Instruction::MSTORE8:
|
|
{
|
|
require(2);
|
|
m_temp[(unsigned)m_stack.back()] = (byte)(m_stack[m_stack.size() - 2] & 0xff);
|
|
m_stack.pop_back();
|
|
m_stack.pop_back();
|
|
break;
|
|
}
|
|
case Instruction::SLOAD:
|
|
require(1);
|
|
m_stack.back() = _ext.store(m_stack.back());
|
|
break;
|
|
case Instruction::SSTORE:
|
|
require(2);
|
|
_ext.setStore(m_stack.back(), m_stack[m_stack.size() - 2]);
|
|
m_stack.pop_back();
|
|
m_stack.pop_back();
|
|
break;
|
|
case Instruction::JUMP:
|
|
require(1);
|
|
nextPC = m_stack.back();
|
|
m_stack.pop_back();
|
|
break;
|
|
case Instruction::JUMPI:
|
|
require(2);
|
|
if (m_stack[m_stack.size() - 2])
|
|
nextPC = m_stack.back();
|
|
m_stack.pop_back();
|
|
m_stack.pop_back();
|
|
break;
|
|
case Instruction::PC:
|
|
m_stack.push_back(m_curPC);
|
|
break;
|
|
case Instruction::MSIZE:
|
|
m_stack.push_back(m_temp.size());
|
|
break;
|
|
case Instruction::GAS:
|
|
m_stack.push_back(m_gas);
|
|
break;
|
|
case Instruction::CREATE:
|
|
{
|
|
require(3);
|
|
|
|
u256 endowment = m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned initOff = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned initSize = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
|
|
if (_ext.balance(_ext.myAddress) >= endowment)
|
|
{
|
|
_ext.subBalance(endowment);
|
|
m_stack.push_back((u160)_ext.create(endowment, &m_gas, bytesConstRef(m_temp.data() + initOff, initSize), _onOp));
|
|
}
|
|
else
|
|
m_stack.push_back(0);
|
|
break;
|
|
}
|
|
case Instruction::CALL:
|
|
case Instruction::CALLSTATELESS:
|
|
{
|
|
require(7);
|
|
|
|
u256 gas = m_stack.back();
|
|
m_stack.pop_back();
|
|
Address receiveAddress = asAddress(m_stack.back());
|
|
m_stack.pop_back();
|
|
u256 value = m_stack.back();
|
|
m_stack.pop_back();
|
|
|
|
unsigned inOff = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned inSize = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned outOff = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned outSize = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
|
|
if (_ext.balance(_ext.myAddress) >= value)
|
|
{
|
|
_ext.subBalance(value);
|
|
m_stack.push_back(_ext.call(inst == Instruction::CALL ? receiveAddress : _ext.myAddress, value, bytesConstRef(m_temp.data() + inOff, inSize), &gas, bytesRef(m_temp.data() + outOff, outSize), _onOp, Address(), receiveAddress));
|
|
}
|
|
else
|
|
m_stack.push_back(0);
|
|
|
|
m_gas += gas;
|
|
break;
|
|
}
|
|
case Instruction::RETURN:
|
|
{
|
|
require(2);
|
|
|
|
unsigned b = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned s = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
|
|
return bytesConstRef(m_temp.data() + b, s);
|
|
}
|
|
case Instruction::SUICIDE:
|
|
{
|
|
require(1);
|
|
Address dest = asAddress(m_stack.back());
|
|
_ext.suicide(dest);
|
|
// ...follow through to...
|
|
}
|
|
case Instruction::STOP:
|
|
return bytesConstRef();
|
|
case Instruction::POST:
|
|
{
|
|
require(5);
|
|
|
|
u256 gas = m_stack.back();
|
|
m_stack.pop_back();
|
|
u160 receiveAddress = asAddress(m_stack.back());
|
|
m_stack.pop_back();
|
|
u256 value = m_stack.back();
|
|
m_stack.pop_back();
|
|
|
|
unsigned inOff = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
unsigned inSize = (unsigned)m_stack.back();
|
|
m_stack.pop_back();
|
|
|
|
if (_ext.balance(_ext.myAddress) >= value)
|
|
{
|
|
_ext.subBalance(value);
|
|
_ext.post(receiveAddress, value, bytesConstRef(m_temp.data() + inOff, inSize), gas);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
BOOST_THROW_EXCEPTION(BadInstruction());
|
|
}
|
|
}
|
|
if (_steps == (uint64_t)-1)
|
|
BOOST_THROW_EXCEPTION(StepsDone());
|
|
return bytesConstRef();
|
|
}
|
|
}
|
|
|