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VM.cpp
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/*
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/>.
*/
#include "interpreter.h"
#include "VM.h"
#include <aleth/version.h>
namespace
{
void destroy(evmc_instance* _instance)
{
(void)_instance;
}
evmc_capabilities_flagset getCapabilities(evmc_instance* _instance) noexcept
{
(void)_instance;
return EVMC_CAPABILITY_EVM1;
}
void delete_output(const evmc_result* result)
{
delete[] result->output_data;
}
evmc_result execute(evmc_instance* _instance, evmc_context* _context, evmc_revision _rev,
const evmc_message* _msg, uint8_t const* _code, size_t _codeSize) noexcept
{
(void)_instance;
std::unique_ptr<dev::eth::VM> vm{new dev::eth::VM};
evmc_result result = {};
dev::eth::owning_bytes_ref output;
try
{
output = vm->exec(_context, _rev, _msg, _code, _codeSize);
result.status_code = EVMC_SUCCESS;
result.gas_left = vm->m_io_gas;
}
catch (dev::eth::RevertInstruction& ex)
{
result.status_code = EVMC_REVERT;
result.gas_left = vm->m_io_gas;
output = ex.output(); // This moves the output from the exception!
}
catch (dev::eth::BadInstruction const&)
{
result.status_code = EVMC_UNDEFINED_INSTRUCTION;
}
catch (dev::eth::OutOfStack const&)
{
result.status_code = EVMC_STACK_OVERFLOW;
}
catch (dev::eth::StackUnderflow const&)
{
result.status_code = EVMC_STACK_UNDERFLOW;
}
catch (dev::eth::BufferOverrun const&)
{
result.status_code = EVMC_INVALID_MEMORY_ACCESS;
}
catch (dev::eth::OutOfGas const&)
{
result.status_code = EVMC_OUT_OF_GAS;
}
catch (dev::eth::BadJumpDestination const&)
{
result.status_code = EVMC_BAD_JUMP_DESTINATION;
}
catch (dev::eth::DisallowedStateChange const&)
{
result.status_code = EVMC_STATIC_MODE_VIOLATION;
}
catch (dev::eth::VMException const&)
{
result.status_code = EVMC_FAILURE;
}
catch (...)
{
result.status_code = EVMC_INTERNAL_ERROR;
}
if (!output.empty())
{
// Make a copy of the output.
auto outputData = new uint8_t[output.size()];
std::memcpy(outputData, output.data(), output.size());
result.output_data = outputData;
result.output_size = output.size();
result.release = delete_output;
}
return result;
}
} // namespace
extern "C" evmc_instance* evmc_create_interpreter() noexcept
{
// TODO: Allow creating multiple instances with different configurations.
static evmc_instance s_instance{
EVMC_ABI_VERSION,
"interpreter",
aleth_version,
::destroy,
::execute,
getCapabilities,
nullptr, // set_tracer
nullptr, // set_option
};
return &s_instance;
}
namespace dev
{
namespace eth
{
uint64_t VM::memNeed(u256 const& _offset, u256 const& _size)
{
return toInt63(_size ? u512(_offset) + _size : u512(0));
}
template <class S>
S divWorkaround(S const& _a, S const& _b)
{
return (S)(s512(_a) / s512(_b));
}
template <class S>
S modWorkaround(S const& _a, S const& _b)
{
return (S)(s512(_a) % s512(_b));
}
//
// for decoding destinations of JUMPTO, JUMPV, JUMPSUB and JUMPSUBV
//
uint64_t VM::decodeJumpDest(const byte* const _code, uint64_t& _pc)
{
// turn 2 MSB-first bytes in the code into a native-order integer
uint64_t dest = _code[_pc++];
dest = (dest << 8) | _code[_pc++];
return dest;
}
uint64_t VM::decodeJumpvDest(const byte* const _code, uint64_t& _pc, byte _voff)
{
// Layout of jump table in bytecode...
// byte opcode
// byte n_jumps
// byte table[n_jumps][2]
//
uint64_t pc = _pc;
byte n = _code[++pc]; // byte after opcode is number of jumps
if (_voff >= n) _voff = n - 1; // if offset overflows use default jump
pc += _voff * 2; // adjust inout pc before index destination in table
uint64_t dest = decodeJumpDest(_code, pc);
_pc += 1 + n * 2; // adust inout _pc to opcode after table
return dest;
}
//
// set current SP to SP', adjust SP' per _removed and _added items
//
void VM::adjustStack(int _removed, int _added)
{
m_SP = m_SPP;
// adjust stack and check bounds
m_SPP += _removed;
if (m_stackEnd < m_SPP)
throwBadStack(_removed, _added);
m_SPP -= _added;
if (m_SPP < m_stack)
throwBadStack(_removed, _added);
}
uint64_t VM::gasForMem(u512 const& _size)
{
constexpr int64_t memoryGas = VMSchedule::memoryGas;
constexpr int64_t quadCoeffDiv = VMSchedule::quadCoeffDiv;
u512 s = _size / 32;
return toInt63(memoryGas * s + s * s / quadCoeffDiv);
}
void VM::updateIOGas()
{
if (m_io_gas < m_runGas)
throwOutOfGas();
m_io_gas -= m_runGas;
}
void VM::updateGas()
{
if (m_newMemSize > m_mem.size())
m_runGas += toInt63(gasForMem(m_newMemSize) - gasForMem(m_mem.size()));
m_runGas += (VMSchedule::copyGas * ((m_copyMemSize + 31) / 32));
if (m_io_gas < m_runGas)
throwOutOfGas();
}
void VM::updateMem(uint64_t _newMem)
{
m_newMemSize = (_newMem + 31) / 32 * 32;
updateGas();
if (m_newMemSize > m_mem.size())
m_mem.resize(m_newMemSize);
}
void VM::logGasMem()
{
unsigned n = (unsigned) m_OP - (unsigned) Instruction::LOG0;
constexpr int64_t logDataGas = VMSchedule::logDataGas;
m_runGas = toInt63(
VMSchedule::logGas + VMSchedule::logTopicGas * n + logDataGas * u512(m_SP[1]));
updateMem(memNeed(m_SP[0], m_SP[1]));
}
void VM::fetchInstruction()
{
m_OP = Instruction(m_code[m_PC]);
auto const metric = c_metrics[static_cast<size_t>(m_OP)];
adjustStack(metric.num_stack_arguments, metric.num_stack_returned_items);
// FEES...
m_runGas = metric.gas_cost;
m_newMemSize = m_mem.size();
m_copyMemSize = 0;
}
evmc_tx_context const& VM::getTxContext()
{
if (!m_tx_context)
m_tx_context.emplace(m_context->host->get_tx_context(m_context));
return m_tx_context.value();
}
///////////////////////////////////////////////////////////////////////////////
//
// interpreter entry point
owning_bytes_ref VM::exec(evmc_context* _context, evmc_revision _rev, const evmc_message* _msg,
uint8_t const* _code, size_t _codeSize)
{
m_context = _context;
m_rev = _rev;
m_message = _msg;
m_io_gas = uint64_t(_msg->gas);
m_PC = 0;
m_pCode = _code;
m_codeSize = _codeSize;
// trampoline to minimize depth of call stack when calling out
m_bounce = &VM::initEntry;
do
(this->*m_bounce)();
while (m_bounce);
return std::move(m_output);
}
//
// main interpreter loop and switch
//
void VM::interpretCases()
{
INIT_CASES
DO_CASES
{
//
// Call-related instructions
//
CASE(CREATE2)
{
ON_OP();
if (m_rev < EVMC_CONSTANTINOPLE)
throwBadInstruction();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
m_bounce = &VM::caseCreate;
}
BREAK
CASE(CREATE)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
m_bounce = &VM::caseCreate;
}
BREAK
CASE(DELEGATECALL)
CASE(STATICCALL)
CASE(CALL)
CASE(CALLCODE)
{
ON_OP();
if (m_OP == Instruction::DELEGATECALL && m_rev < EVMC_HOMESTEAD)
throwBadInstruction();
if (m_OP == Instruction::STATICCALL && m_rev < EVMC_BYZANTIUM)
throwBadInstruction();
if (m_OP == Instruction::CALL && m_message->flags & EVMC_STATIC && m_SP[2] != 0)
throwDisallowedStateChange();
m_bounce = &VM::caseCall;
}
BREAK
CASE(RETURN)
{
ON_OP();
m_copyMemSize = 0;
updateMem(memNeed(m_SP[0], m_SP[1]));
updateIOGas();
uint64_t b = (uint64_t)m_SP[0];
uint64_t s = (uint64_t)m_SP[1];
m_output = owning_bytes_ref{std::move(m_mem), b, s};
m_bounce = 0;
}
BREAK
CASE(REVERT)
{
// Pre-byzantium
if (m_rev < EVMC_BYZANTIUM)
throwBadInstruction();
ON_OP();
m_copyMemSize = 0;
updateMem(memNeed(m_SP[0], m_SP[1]));
updateIOGas();
uint64_t b = (uint64_t)m_SP[0];
uint64_t s = (uint64_t)m_SP[1];
owning_bytes_ref output{std::move(m_mem), b, s};
throwRevertInstruction(std::move(output));
}
BREAK;
CASE(SUICIDE)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
m_runGas = m_rev >= EVMC_TANGERINE_WHISTLE ? 5000 : 0;
evmc_address destination = toEvmC(asAddress(m_SP[0]));
// After EIP158 zero-value suicides do not have to pay account creation gas.
u256 const balance =
fromEvmC(m_context->host->get_balance(m_context, &m_message->destination));
if (balance > 0 || m_rev < EVMC_SPURIOUS_DRAGON)
{
// After EIP150 hard fork charge additional cost of sending
// ethers to non-existing account.
int destinationExists =
m_context->host->account_exists(m_context, &destination);
if (m_rev >= EVMC_TANGERINE_WHISTLE && !destinationExists)
m_runGas += VMSchedule::callNewAccount;
}
updateIOGas();
m_context->host->selfdestruct(m_context, &m_message->destination, &destination);
m_bounce = nullptr;
}
BREAK
CASE(STOP)
{
ON_OP();
updateIOGas();
m_bounce = 0;
}
BREAK
//
// instructions potentially expanding memory
//
CASE(MLOAD)
{
ON_OP();
updateMem(toInt63(m_SP[0]) + 32);
updateIOGas();
m_SPP[0] = (u256)*(h256 const*)(m_mem.data() + (unsigned)m_SP[0]);
}
NEXT
CASE(MSTORE)
{
ON_OP();
updateMem(toInt63(m_SP[0]) + 32);
updateIOGas();
*(h256*)&m_mem[(unsigned)m_SP[0]] = (h256)m_SP[1];
}
NEXT
CASE(MSTORE8)
{
ON_OP();
updateMem(toInt63(m_SP[0]) + 1);
updateIOGas();
m_mem[(unsigned)m_SP[0]] = (byte)(m_SP[1] & 0xff);
}
NEXT
CASE(SHA3)
{
ON_OP();
constexpr int64_t sha3Gas = VMSchedule::sha3Gas;
constexpr int64_t sha3WordGas = VMSchedule::sha3WordGas;
m_runGas = toInt63(sha3Gas + (u512(m_SP[1]) + 31) / 32 * sha3WordGas);
updateMem(memNeed(m_SP[0], m_SP[1]));
updateIOGas();
uint64_t inOff = (uint64_t)m_SP[0];
uint64_t inSize = (uint64_t)m_SP[1];
const auto h = ethash::keccak256(m_mem.data() + inOff, inSize);
m_SPP[0] = static_cast<u256>(h256{h.bytes, h256::ConstructFromPointer});
}
NEXT
CASE(LOG0)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
logGasMem();
updateIOGas();
uint8_t const* data = m_mem.data() + size_t(m_SP[0]);
size_t dataSize = size_t(m_SP[1]);
m_context->host->emit_log(
m_context, &m_message->destination, data, dataSize, nullptr, 0);
}
NEXT
CASE(LOG1)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
logGasMem();
updateIOGas();
uint8_t const* data = m_mem.data() + size_t(m_SP[0]);
size_t dataSize = size_t(m_SP[1]);
evmc_uint256be topics[] = {toEvmC(m_SP[2])};
size_t numTopics = sizeof(topics) / sizeof(topics[0]);
m_context->host->emit_log(
m_context, &m_message->destination, data, dataSize, topics, numTopics);
}
NEXT
CASE(LOG2)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
logGasMem();
updateIOGas();
uint8_t const* data = m_mem.data() + size_t(m_SP[0]);
size_t dataSize = size_t(m_SP[1]);
evmc_uint256be topics[] = {toEvmC(m_SP[2]), toEvmC(m_SP[3])};
size_t numTopics = sizeof(topics) / sizeof(topics[0]);
m_context->host->emit_log(
m_context, &m_message->destination, data, dataSize, topics, numTopics);
}
NEXT
CASE(LOG3)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
logGasMem();
updateIOGas();
uint8_t const* data = m_mem.data() + size_t(m_SP[0]);
size_t dataSize = size_t(m_SP[1]);
evmc_uint256be topics[] = {toEvmC(m_SP[2]), toEvmC(m_SP[3]), toEvmC(m_SP[4])};
size_t numTopics = sizeof(topics) / sizeof(topics[0]);
m_context->host->emit_log(
m_context, &m_message->destination, data, dataSize, topics, numTopics);
}
NEXT
CASE(LOG4)
{
ON_OP();
if (m_message->flags & EVMC_STATIC)
throwDisallowedStateChange();
logGasMem();
updateIOGas();
uint8_t const* data = m_mem.data() + size_t(m_SP[0]);
size_t dataSize = size_t(m_SP[1]);
evmc_uint256be topics[] = {
toEvmC(m_SP[2]), toEvmC(m_SP[3]), toEvmC(m_SP[4]), toEvmC(m_SP[5])};
size_t numTopics = sizeof(topics) / sizeof(topics[0]);
m_context->host->emit_log(
m_context, &m_message->destination, data, dataSize, topics, numTopics);
}
NEXT
CASE(EXP)
{
u256 expon = m_SP[1];
const int64_t byteCost = m_rev >= EVMC_SPURIOUS_DRAGON ? 50 : 10;
m_runGas = toInt63(VMSchedule::stepGas5 + byteCost * (32 - (h256(expon).firstBitSet() / 8)));
ON_OP();
updateIOGas();
u256 base = m_SP[0];
m_SPP[0] = exp256(base, expon);
}
NEXT
//
// ordinary instructions
//
CASE(ADD)
{
ON_OP();
updateIOGas();
//pops two items and pushes their sum mod 2^256.
m_SPP[0] = m_SP[0] + m_SP[1];
}
NEXT
CASE(MUL)
{
ON_OP();
updateIOGas();
//pops two items and pushes their product mod 2^256.
m_SPP[0] = m_SP[0] * m_SP[1];
}
NEXT
CASE(SUB)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] - m_SP[1];
}
NEXT
CASE(DIV)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[1] ? divWorkaround(m_SP[0], m_SP[1]) : 0;
}
NEXT
CASE(SDIV)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[1] ? s2u(divWorkaround(u2s(m_SP[0]), u2s(m_SP[1]))) : 0;
--m_SP;
}
NEXT
CASE(MOD)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[1] ? modWorkaround(m_SP[0], m_SP[1]) : 0;
}
NEXT
CASE(SMOD)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[1] ? s2u(modWorkaround(u2s(m_SP[0]), u2s(m_SP[1]))) : 0;
}
NEXT
CASE(NOT)
{
ON_OP();
updateIOGas();
m_SPP[0] = ~m_SP[0];
}
NEXT
CASE(LT)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] < m_SP[1] ? 1 : 0;
}
NEXT
CASE(GT)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] > m_SP[1] ? 1 : 0;
}
NEXT
CASE(SLT)
{
ON_OP();
updateIOGas();
m_SPP[0] = u2s(m_SP[0]) < u2s(m_SP[1]) ? 1 : 0;
}
NEXT
CASE(SGT)
{
ON_OP();
updateIOGas();
m_SPP[0] = u2s(m_SP[0]) > u2s(m_SP[1]) ? 1 : 0;
}
NEXT
CASE(EQ)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] == m_SP[1] ? 1 : 0;
}
NEXT
CASE(ISZERO)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] ? 0 : 1;
}
NEXT
CASE(AND)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] & m_SP[1];
}
NEXT
CASE(OR)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] | m_SP[1];
}
NEXT
CASE(XOR)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] ^ m_SP[1];
}
NEXT
CASE(BYTE)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[0] < 32 ? (m_SP[1] >> (unsigned)(8 * (31 - m_SP[0]))) & 0xff : 0;
}
NEXT
CASE(SHL)
{
// Pre-constantinople
if (m_rev < EVMC_CONSTANTINOPLE)
throwBadInstruction();
ON_OP();
updateIOGas();
if (m_SP[0] >= 256)
m_SPP[0] = 0;
else
m_SPP[0] = m_SP[1] << unsigned(m_SP[0]);
}
NEXT
CASE(SHR)
{
// Pre-constantinople
if (m_rev < EVMC_CONSTANTINOPLE)
throwBadInstruction();
ON_OP();
updateIOGas();
if (m_SP[0] >= 256)
m_SPP[0] = 0;
else
m_SPP[0] = m_SP[1] >> unsigned(m_SP[0]);
}
NEXT
CASE(SAR)
{
// Pre-constantinople
if (m_rev < EVMC_CONSTANTINOPLE)
throwBadInstruction();
ON_OP();
updateIOGas();
static u256 const hibit = u256(1) << 255;
static u256 const allbits =
u256("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
u256 shiftee = m_SP[1];
if (m_SP[0] >= 256)
{
if (shiftee & hibit)
m_SPP[0] = allbits;
else
m_SPP[0] = 0;
}
else
{
unsigned amount = unsigned(m_SP[0]);
m_SPP[0] = shiftee >> amount;
if (shiftee & hibit)
m_SPP[0] |= allbits << (256 - amount);
}
}
NEXT
CASE(ADDMOD)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[2] ? u256((u512(m_SP[0]) + u512(m_SP[1])) % m_SP[2]) : 0;
}
NEXT
CASE(MULMOD)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_SP[2] ? u256((u512(m_SP[0]) * u512(m_SP[1])) % m_SP[2]) : 0;
}
NEXT
CASE(SIGNEXTEND)
{
ON_OP();
updateIOGas();
if (m_SP[0] < 31)
{
unsigned testBit = static_cast<unsigned>(m_SP[0]) * 8 + 7;
u256& number = m_SP[1];
u256 mask = ((u256(1) << testBit) - 1);
if (boost::multiprecision::bit_test(number, testBit))
number |= ~mask;
else
number &= mask;
}
}
NEXT
CASE(JUMPTO)
CASE(JUMPIF)
CASE(JUMPV)
CASE(JUMPSUB)
CASE(JUMPSUBV)
CASE(RETURNSUB)
CASE(BEGINSUB)
CASE(BEGINDATA)
CASE(GETLOCAL)
CASE(PUTLOCAL)
{
throwBadInstruction();
}
CONTINUE
CASE(XADD)
CASE(XMUL)
CASE(XSUB)
CASE(XDIV)
CASE(XSDIV)
CASE(XMOD)
CASE(XSMOD)
CASE(XLT)
CASE(XGT)
CASE(XSLT)
CASE(XSGT)
CASE(XEQ)
CASE(XISZERO)
CASE(XAND)
CASE(XOOR)
CASE(XXOR)
CASE(XNOT)
CASE(XSHL)
CASE(XSHR)
CASE(XSAR)
CASE(XROL)
CASE(XROR)
CASE(XMLOAD)
CASE(XMSTORE)
CASE(XSLOAD)
CASE(XSSTORE)
CASE(XVTOWIDE)
CASE(XWIDETOV)
CASE(XPUSH)
CASE(XPUT)
CASE(XGET)
CASE(XSWIZZLE)
CASE(XSHUFFLE)
{
throwBadInstruction();
}
CONTINUE
CASE(ADDRESS)
{
ON_OP();
updateIOGas();
m_SPP[0] = fromAddress(fromEvmC(m_message->destination));
}
NEXT
CASE(ORIGIN)
{
ON_OP();
updateIOGas();
m_SPP[0] = fromAddress(fromEvmC(getTxContext().tx_origin));
}
NEXT
CASE(BALANCE)
{
m_runGas = m_rev >= EVMC_TANGERINE_WHISTLE ? 400 : 20;
ON_OP();
updateIOGas();
evmc_address address = toEvmC(asAddress(m_SP[0]));
m_SPP[0] = fromEvmC(m_context->host->get_balance(m_context, &address));
}
NEXT
CASE(CALLER)
{
ON_OP();
updateIOGas();
m_SPP[0] = fromAddress(fromEvmC(m_message->sender));
}
NEXT
CASE(CALLVALUE)
{
ON_OP();
updateIOGas();
m_SPP[0] = fromEvmC(m_message->value);
}
NEXT
CASE(CALLDATALOAD)
{
ON_OP();
updateIOGas();
size_t const dataSize = m_message->input_size;
uint8_t const* const data = m_message->input_data;
if (u512(m_SP[0]) + 31 < dataSize)
m_SP[0] = (u256)*(h256 const*)(data + (size_t)m_SP[0]);
else if (m_SP[0] >= dataSize)
m_SP[0] = u256(0);
else
{ h256 r;
for (uint64_t i = (uint64_t)m_SP[0], e = (uint64_t)m_SP[0] + (uint64_t)32, j = 0; i < e; ++i, ++j)
r[j] = i < dataSize ? data[i] : 0;
m_SP[0] = (u256)r;
};
}
NEXT
CASE(CALLDATASIZE)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_message->input_size;
}
NEXT
CASE(RETURNDATASIZE)
{
if (m_rev < EVMC_BYZANTIUM)
throwBadInstruction();
ON_OP();
updateIOGas();
m_SPP[0] = m_returnData.size();
}
NEXT
CASE(CODESIZE)
{
ON_OP();
updateIOGas();
m_SPP[0] = m_codeSize;
}
NEXT
CASE(EXTCODESIZE)
{
m_runGas = m_rev >= EVMC_TANGERINE_WHISTLE ? 700 : 20;
ON_OP();
updateIOGas();
evmc_address address = toEvmC(asAddress(m_SP[0]));
m_SPP[0] = m_context->host->get_code_size(m_context, &address);
}
NEXT
CASE(CALLDATACOPY)
{