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EVMRuntime.sol
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pragma solidity ^0.5.2;
pragma experimental ABIEncoderV2;
import { EVMConstants } from "./EVMConstants.sol";
import { EVMMemory } from "./EVMMemory.slb";
import { EVMStack } from "./EVMStack.slb";
import { EVMUtils } from "./EVMUtils.slb";
import { EVMCode } from "./EVMCode.slb";
import { EVMTokenBag } from "./EVMTokenBag.slb";
contract EVMRuntime is EVMConstants {
using EVMMemory for EVMMemory.Memory;
using EVMStack for EVMStack.Stack;
using EVMCode for EVMCode.Code;
using EVMTokenBag for EVMTokenBag.TokenBag;
// bridge has to defreagment the tokens
// bridge has to check approvals
// bridge has to convert color to address
// we are assuming all token calls cost 0 for now
// find correct funcSigs
function getSig(bytes memory _msgData) internal pure returns (bytes4) {
return bytes4(_msgData[3]) >> 24 | bytes4(_msgData[2]) >> 16 | bytes4(_msgData[1]) >> 8 | bytes4(_msgData[0]);
}
// what we do not track (not complete list)
// call depth: as we do not support stateful things like call to other contracts
// staticExec: same as above, we only support precompiles, higher implementations still can intercept calls
struct EVM {
uint customDataPtr;
uint gas;
uint value;
uint8 errno;
uint n;
uint pc;
bytes data;
bytes returnData;
EVMCode.Code code;
EVMMemory.Memory mem;
EVMStack.Stack stack;
EVMTokenBag.TokenBag tokenBag;
uint256 blockNumber;
uint256 blockHash;
uint256 blockTime;
// caller is also origin, as we do not support calling other contracts
address caller;
address target;
}
// solhint-disable-next-line code-complexity, function-max-lines, security/no-assign-params
function _run(EVM memory evm, uint pc, uint pcStepCount) internal {
uint pcNext = 0;
uint stepRun = 0;
while (evm.errno == NO_ERROR && pc < evm.code.length && (pcStepCount == 0 || stepRun < pcStepCount)) {
uint stackIn;
uint stackOut;
uint gasFee;
uint8 opcode = evm.code.getOpcodeAt(pc);
function(EVM memory) internal opcodeHandler;
if (opcode == 0) {
opcodeHandler = handleSTOP;
stackIn = 0;
stackOut = 0;
gasFee = GAS_ZERO;
} else if (opcode == 1) {
opcodeHandler = handleADD;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 2) {
opcodeHandler = handleMUL;
stackIn = 2;
stackOut = 1;
gasFee = GAS_LOW;
} else if (opcode == 3) {
opcodeHandler = handleSUB;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 4) {
opcodeHandler = handleDIV;
stackIn = 2;
stackOut = 1;
gasFee = GAS_LOW;
} else if (opcode == 5) {
opcodeHandler = handleSDIV;
stackIn = 2;
stackOut = 1;
gasFee = GAS_LOW;
} else if (opcode == 6) {
opcodeHandler = handleMOD;
stackIn = 2;
stackOut = 1;
gasFee = GAS_LOW;
} else if (opcode == 7) {
opcodeHandler = handleSMOD;
stackIn = 2;
stackOut = 1;
gasFee = GAS_LOW;
} else if (opcode == 8) {
opcodeHandler = handleADDMOD;
stackIn = 3;
stackOut = 1;
gasFee = GAS_MID;
} else if (opcode == 9) {
opcodeHandler = handleMULMOD;
stackIn = 3;
stackOut = 1;
gasFee = GAS_MID;
} else if (opcode == 10) {
opcodeHandler = handleEXP;
stackIn = 2;
stackOut = 1;
gasFee = GAS_EXP;
} else if (opcode == 11) {
opcodeHandler = handleSIGNEXTEND;
stackIn = 0;
stackOut = 0;
gasFee = GAS_LOW;
} else if (opcode == 16) {
opcodeHandler = handleLT;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 17) {
opcodeHandler = handleGT;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 18) {
opcodeHandler = handleSLT;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 19) {
opcodeHandler = handleSGT;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 20) {
opcodeHandler = handleEQ;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 21) {
opcodeHandler = handleISZERO;
stackIn = 1;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 22) {
opcodeHandler = handleAND;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 23) {
opcodeHandler = handleOR;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 24) {
opcodeHandler = handleXOR;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 25) {
opcodeHandler = handleNOT;
stackIn = 1;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 26) {
opcodeHandler = handleBYTE;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 27) {
opcodeHandler = handleSHL;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 28) {
opcodeHandler = handleSHR;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 29) {
opcodeHandler = handleSAR;
stackIn = 2;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 32) {
opcodeHandler = handleSHA3;
stackIn = 2;
stackOut = 1;
gasFee = GAS_SHA3;
} else if (opcode == 48) {
opcodeHandler = handleADDRESS;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 49) {
opcodeHandler = handleBALANCE;
stackIn = 1;
stackOut = 1;
gasFee = GAS_BALANCE;
} else if (opcode == 50) {
opcodeHandler = handleORIGIN;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 51) {
opcodeHandler = handleCALLER;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 52) {
opcodeHandler = handleCALLVALUE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 53) {
opcodeHandler = handleCALLDATALOAD;
stackIn = 1;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 54) {
opcodeHandler = handleCALLDATASIZE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 55) {
opcodeHandler = handleCALLDATACOPY;
stackIn = 3;
stackOut = 0;
gasFee = GAS_VERYLOW;
} else if (opcode == 56) {
opcodeHandler = handleCODESIZE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 57) {
opcodeHandler = handleCODECOPY;
stackIn = 3;
stackOut = 0;
gasFee = GAS_VERYLOW;
} else if (opcode == 58) {
opcodeHandler = handleGASPRICE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 59) {
opcodeHandler = handleEXTCODESIZE;
stackIn = 1;
stackOut = 1;
gasFee = GAS_EXTCODE;
} else if (opcode == 60) {
opcodeHandler = handleEXTCODECOPY;
stackIn = 4;
stackOut = 0;
gasFee = GAS_EXTCODE;
} else if (opcode == 61) {
opcodeHandler = handleRETURNDATASIZE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 62) {
opcodeHandler = handleRETURNDATACOPY;
stackIn = 3;
stackOut = 0;
gasFee = GAS_VERYLOW;
} else if (opcode == 63) {
opcodeHandler = handleEXTCODEHASH;
stackIn = 1;
stackOut = 1;
gasFee = GAS_EXTCODEHASH;
} else if (opcode == 64) {
opcodeHandler = handleBLOCKHASH;
stackIn = 1;
stackOut = 1;
gasFee = GAS_BLOCKHASH;
} else if (opcode == 65) {
opcodeHandler = handleCOINBASE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 66) {
opcodeHandler = handleTIMESTAMP;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 67) {
opcodeHandler = handleNUMBER;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 68) {
opcodeHandler = handleDIFFICULTY;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 69) {
opcodeHandler = handleGASLIMIT;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 80) {
opcodeHandler = handlePOP;
stackIn = 1;
stackOut = 0;
gasFee = GAS_BASE;
} else if (opcode == 81) {
opcodeHandler = handleMLOAD;
stackIn = 1;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 82) {
opcodeHandler = handleMSTORE;
stackIn = 2;
stackOut = 0;
gasFee = GAS_VERYLOW;
} else if (opcode == 83) {
opcodeHandler = handleMSTORE8;
stackIn = 2;
stackOut = 0;
gasFee = GAS_VERYLOW;
} else if (opcode == 84) {
opcodeHandler = handleSLOAD;
stackIn = 1;
stackOut = 1;
gasFee = GAS_SLOAD;
} else if (opcode == 85) {
opcodeHandler = handleSSTORE;
stackIn = 2;
stackOut = 0;
gasFee = GAS_ADDITIONAL_HANDLING;
} else if (opcode == 86) {
opcodeHandler = handleJUMP;
stackIn = 1;
stackOut = 0;
gasFee = GAS_MID;
} else if (opcode == 87) {
opcodeHandler = handleJUMPI;
stackIn = 2;
stackOut = 0;
gasFee = GAS_HIGH;
} else if (opcode == 88) {
opcodeHandler = handlePC;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 89) {
opcodeHandler = handleMSIZE;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 90) {
opcodeHandler = handleGAS;
stackIn = 0;
stackOut = 1;
gasFee = GAS_BASE;
} else if (opcode == 91) {
opcodeHandler = handleJUMPDEST;
stackIn = 0;
stackOut = 0;
gasFee = GAS_JUMPDEST;
} else if (opcode >= 96 && opcode <= 127) {
opcodeHandler = handlePUSH;
stackIn = 0;
stackOut = 1;
gasFee = GAS_VERYLOW;
} else if (opcode == 128) {
opcodeHandler = handleDUP;
stackIn = 1;
stackOut = 2;
gasFee = GAS_VERYLOW;
} else if (opcode == 129) {
opcodeHandler = handleDUP;
stackIn = 2;
stackOut = 3;
gasFee = GAS_VERYLOW;
} else if (opcode == 130) {
opcodeHandler = handleDUP;
stackIn = 3;
stackOut = 4;
gasFee = GAS_VERYLOW;
} else if (opcode == 131) {
opcodeHandler = handleDUP;
stackIn = 4;
stackOut = 5;
gasFee = GAS_VERYLOW;
} else if (opcode == 132) {
opcodeHandler = handleDUP;
stackIn = 5;
stackOut = 6;
gasFee = GAS_VERYLOW;
} else if (opcode == 133) {
opcodeHandler = handleDUP;
stackIn = 6;
stackOut = 7;
gasFee = GAS_VERYLOW;
} else if (opcode == 134) {
opcodeHandler = handleDUP;
stackIn = 7;
stackOut = 8;
gasFee = GAS_VERYLOW;
} else if (opcode == 135) {
opcodeHandler = handleDUP;
stackIn = 8;
stackOut = 9;
gasFee = GAS_VERYLOW;
} else if (opcode == 136) {
opcodeHandler = handleDUP;
stackIn = 9;
stackOut = 10;
gasFee = GAS_VERYLOW;
} else if (opcode == 137) {
opcodeHandler = handleDUP;
stackIn = 10;
stackOut = 11;
gasFee = GAS_VERYLOW;
} else if (opcode == 138) {
opcodeHandler = handleDUP;
stackIn = 11;
stackOut = 12;
gasFee = GAS_VERYLOW;
} else if (opcode == 139) {
opcodeHandler = handleDUP;
stackIn = 12;
stackOut = 13;
gasFee = GAS_VERYLOW;
} else if (opcode == 140) {
opcodeHandler = handleDUP;
stackIn = 13;
stackOut = 14;
gasFee = GAS_VERYLOW;
} else if (opcode == 141) {
opcodeHandler = handleDUP;
stackIn = 14;
stackOut = 15;
gasFee = GAS_VERYLOW;
} else if (opcode == 142) {
opcodeHandler = handleDUP;
stackIn = 15;
stackOut = 16;
gasFee = GAS_VERYLOW;
} else if (opcode == 143) {
opcodeHandler = handleDUP;
stackIn = 16;
stackOut = 17;
gasFee = GAS_VERYLOW;
} else if (opcode == 144) {
opcodeHandler = handleSWAP;
stackIn = 2;
stackOut = 2;
gasFee = GAS_VERYLOW;
} else if (opcode == 145) {
opcodeHandler = handleSWAP;
stackIn = 3;
stackOut = 3;
gasFee = GAS_VERYLOW;
} else if (opcode == 146) {
opcodeHandler = handleSWAP;
stackIn = 4;
stackOut = 4;
gasFee = GAS_VERYLOW;
} else if (opcode == 147) {
opcodeHandler = handleSWAP;
stackIn = 5;
stackOut = 5;
gasFee = GAS_VERYLOW;
} else if (opcode == 148) {
opcodeHandler = handleSWAP;
stackIn = 6;
stackOut = 6;
gasFee = GAS_VERYLOW;
} else if (opcode == 149) {
opcodeHandler = handleSWAP;
stackIn = 7;
stackOut = 7;
gasFee = GAS_VERYLOW;
} else if (opcode == 150) {
opcodeHandler = handleSWAP;
stackIn = 8;
stackOut = 8;
gasFee = GAS_VERYLOW;
} else if (opcode == 151) {
opcodeHandler = handleSWAP;
stackIn = 9;
stackOut = 9;
gasFee = GAS_VERYLOW;
} else if (opcode == 152) {
opcodeHandler = handleSWAP;
stackIn = 10;
stackOut = 10;
gasFee = GAS_VERYLOW;
} else if (opcode == 153) {
opcodeHandler = handleSWAP;
stackIn = 11;
stackOut = 11;
gasFee = GAS_VERYLOW;
} else if (opcode == 154) {
opcodeHandler = handleSWAP;
stackIn = 12;
stackOut = 12;
gasFee = GAS_VERYLOW;
} else if (opcode == 155) {
opcodeHandler = handleSWAP;
stackIn = 13;
stackOut = 13;
gasFee = GAS_VERYLOW;
} else if (opcode == 156) {
opcodeHandler = handleSWAP;
stackIn = 14;
stackOut = 14;
gasFee = GAS_VERYLOW;
} else if (opcode == 157) {
opcodeHandler = handleSWAP;
stackIn = 15;
stackOut = 15;
gasFee = GAS_VERYLOW;
} else if (opcode == 158) {
opcodeHandler = handleSWAP;
stackIn = 16;
stackOut = 16;
gasFee = GAS_VERYLOW;
} else if (opcode == 159) {
opcodeHandler = handleSWAP;
stackIn = 17;
stackOut = 17;
gasFee = GAS_VERYLOW;
} else if (opcode == 160) {
opcodeHandler = handleLOG;
stackIn = 2;
stackOut = 0;
gasFee = GAS_LOG;
} else if (opcode == 161) {
opcodeHandler = handleLOG;
stackIn = 3;
stackOut = 0;
gasFee = GAS_LOG;
} else if (opcode == 162) {
opcodeHandler = handleLOG;
stackIn = 4;
stackOut = 0;
gasFee = GAS_LOG;
} else if (opcode == 163) {
opcodeHandler = handleLOG;
stackIn = 5;
stackOut = 0;
gasFee = GAS_LOG;
} else if (opcode == 164) {
opcodeHandler = handleLOG;
stackIn = 6;
stackOut = 0;
gasFee = GAS_LOG;
} else if (opcode == 240) {
opcodeHandler = handleCREATE;
stackIn = 3;
stackOut = 1;
gasFee = GAS_CREATE;
} else if (opcode == 241) {
opcodeHandler = handleCALL;
stackIn = 7;
stackOut = 1;
gasFee = GAS_CALL;
} else if (opcode == 242) {
opcodeHandler = handleCALLCODE;
stackIn = 7;
stackOut = 1;
gasFee = GAS_CALL;
} else if (opcode == 243) {
opcodeHandler = handleRETURN;
stackIn = 2;
stackOut = 0;
gasFee = GAS_ZERO;
} else if (opcode == 244) {
opcodeHandler = handleDELEGATECALL;
stackIn = 6;
stackOut = 1;
gasFee = GAS_CALL;
} else if (opcode == 245) {
opcodeHandler = handleCREATE2;
stackIn = 4;
stackOut = 1;
gasFee = GAS_CREATE;
} else if (opcode == 250) {
opcodeHandler = handleSTATICCALL;
stackIn = 6;
stackOut = 1;
gasFee = GAS_CALL;
} else if (opcode == 253) {
opcodeHandler = handleREVERT;
stackIn = 2;
stackOut = 0;
gasFee = GAS_ZERO;
} else if (opcode == 255) {
opcodeHandler = handleSELFDESTRUCT;
stackIn = 1;
stackOut = 0;
gasFee = GAS_SELFDESTRUCT;
} else {
opcodeHandler = handleINVALID;
stackIn = 0;
stackOut = 0;
gasFee = 0;
}
if (gasFee != GAS_ADDITIONAL_HANDLING) {
if (gasFee > evm.gas) {
evm.errno = ERROR_OUT_OF_GAS;
evm.gas = 0;
break;
}
evm.gas -= gasFee;
}
// Check for stack errors
if (evm.stack.size < stackIn) {
evm.errno = ERROR_STACK_UNDERFLOW;
break;
} else if (stackOut > stackIn && evm.stack.size + stackOut - stackIn > MAX_STACK_SIZE) {
evm.errno = ERROR_STACK_OVERFLOW;
break;
}
if (OP_PUSH1 <= opcode && opcode <= OP_PUSH32) {
evm.pc = pc;
uint n = opcode - OP_PUSH1 + 1;
evm.n = n;
opcodeHandler(evm);
pcNext = pc + n + 1;
} else if (opcode == OP_JUMP || opcode == OP_JUMPI) {
evm.pc = pc;
opcodeHandler(evm);
pcNext = evm.pc;
} else if (opcode == OP_STOP || opcode == OP_RETURN || opcode == OP_REVERT || opcode == OP_SELFDESTRUCT) {
opcodeHandler(evm);
break;
} else {
if (OP_DUP1 <= opcode && opcode <= OP_DUP16) {
evm.n = opcode - OP_DUP1 + 1;
opcodeHandler(evm);
} else if (OP_SWAP1 <= opcode && opcode <= OP_SWAP16) {
evm.n = opcode - OP_SWAP1 + 1;
opcodeHandler(evm);
} else if (OP_LOG0 <= opcode && opcode <= OP_LOG4) {
evm.n = opcode - OP_LOG0;
opcodeHandler(evm);
} else if (opcode == OP_PC) {
evm.pc = pc;
opcodeHandler(evm);
} else {
opcodeHandler(evm);
}
pcNext = pc + 1;
}
if (evm.errno == NO_ERROR) {
pc = pcNext;
}
stepRun = stepRun + 1;
}
evm.pc = pc;
}
function computeGasForMemory(EVM memory state, uint mAddr) internal pure returns (uint) {
uint words = (mAddr + 31) / 32;
if (words > state.mem.size) {
// only charge the difference
uint a = (state.mem.size * GAS_MEMORY) + ((state.mem.size * state.mem.size) / 512);
uint b = (words * GAS_MEMORY) + ((words * words) / 512);
return b - a;
}
return 0;
}
function computeGasForMemory(EVM memory state, uint a, uint b) internal pure returns (uint) {
if (a > b) {
return computeGasForMemory(state, a);
}
return computeGasForMemory(state, b);
}
function computeGasForMemoryCopy(EVM memory state, uint mAddr, uint len) internal pure returns (uint) {
return computeGasForMemory(state, mAddr + len) + (((len + 31) / 32) * GAS_MEMORY);
}
// ************************* Handlers ***************************
// solhint-disable-next-line func-name-mixedcase
function handlePreC_ECRECOVER(EVM memory state) internal {
if (GAS_ECRECOVER > state.gas) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= GAS_ECRECOVER;
uint hash = state.data.length < 32 ? 0 : EVMUtils.toUint(state.data, 0, 32);
uint v = state.data.length < 64 ? 0 : uint8(EVMUtils.toUint(state.data, 32, 32));
uint r = state.data.length < 96 ? 0 : EVMUtils.toUint(state.data, 64, 32);
uint s = state.data.length < 128 ? 0 : EVMUtils.toUint(state.data, 96, 32);
address result = ecrecover(bytes32(hash), uint8(v), bytes32(r), bytes32(s));
state.returnData = EVMUtils.fromUint(uint(result));
}
// solhint-disable-next-line func-name-mixedcase
function handlePreC_SHA256(EVM memory state) internal {
uint gasFee = GAS_SHA256_BASE + (((state.data.length + 31) / 32) * GAS_SHA256_WORD);
if (gasFee > state.gas) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= gasFee;
bytes32 result = sha256(state.data);
state.returnData = EVMUtils.fromUint(uint(result));
}
// solhint-disable-next-line func-name-mixedcase
function handlePreC_RIPEMD160(EVM memory state) internal {
uint gasFee = GAS_RIPEMD160_BASE + (((state.data.length + 31) / 32) * GAS_RIPEMD160_WORD);
if (gasFee > state.gas) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= gasFee;
bytes20 result = ripemd160(state.data);
state.returnData = EVMUtils.fromUint(uint(bytes32(result)));
}
// solhint-disable-next-line func-name-mixedcase
function handlePreC_IDENTITY(EVM memory state) internal {
uint gasFee = GAS_IDENTITY_BASE + (((state.data.length + 31) / 32) * GAS_IDENTITY_WORD);
if (gasFee > state.gas) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= gasFee;
state.returnData = state.data;
}
// solhint-disable-next-line func-name-mixedcase, function-max-lines
function handlePreC_MODEXP(EVM memory state) internal {
// EIP-198
bytes memory inData = state.data;
bytes memory outData;
uint256 gasFee = 0;
assembly {
let inSize := mload(inData)
// outSize is length of modulus
let outSize := mload(add(inData, 0x60))
// get free mem ptr
outData := mload(0x40)
// padding up to word size
let memEnd := add(
outData,
and(
add(
add(
add(outData, outSize),
0x20
),
0x1F
),
not(0x1F)
)
)
// update free mem ptr
mstore(0x40, memEnd)
// for correct gas calculation, we have to touch the new highest mem slot
mstore8(memEnd, 0)
// store outData.length
mstore(outData, outSize)
let inOff := add(inData, 0x20)
let outOff := add(outData, 0x20)
let curGas := gas()
let success := staticcall(curGas, 0x05, inOff, inSize, outOff, outSize)
if iszero(success) {
// In this case we run out of gas, and have to revert (safety measure)
revert(0, 0)
}
gasFee := sub(curGas, gas())
}
// XXX: static warning, if that is not correct anymore then the bytecode changed.
// adjust accordingly ;)
gasFee = (gasFee - 743);
if (gasFee > state.gas) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= gasFee;
state.returnData = outData;
}
// solhint-disable-next-line func-name-mixedcase
function handlePreC_ECADD(EVM memory state) internal {
// EIP-196
bytes memory inData = state.data;
bytes memory outData;
uint256 success;
uint256 gas = state.gas;
assembly {
let inSize := mload(inData)
// outSize is 64 bytes
let outSize := 0x40
// get free mem ptr
outData := mload(0x40)
// padding up to word size
let memEnd := add(
outData,
and(
add(
add(
add(outData, outSize),
0x20
),
0x1F
),
not(0x1F)
)
)
// update free mem ptr
mstore(0x40, memEnd)
// store outData.length
mstore(outData, outSize)
let inOff := add(inData, 0x20)
let outOff := add(outData, 0x20)
success := staticcall(gas, 0x06, inOff, inSize, outOff, outSize)
}
if (GAS_EC_ADD > gas || success == 0) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= GAS_EC_ADD;
state.returnData = outData;
}
// solhint-disable-next-line func-name-mixedcase
function handlePreC_ECMUL(EVM memory state) internal {
// EIP-196
bytes memory inData = state.data;
bytes memory outData;
uint256 success;
uint256 gas = state.gas;
assembly {
let inSize := mload(inData)
// outSize is 64 bytes
let outSize := 0x40
// get free mem ptr
outData := mload(0x40)
// padding up to word size
let memEnd := add(
outData,
and(
add(
add(
add(outData, outSize),
0x20
),
0x1F
),
not(0x1F)
)
)
// update free mem ptr
mstore(0x40, memEnd)
// store outData.length
mstore(outData, outSize)
let inOff := add(inData, 0x20)
let outOff := add(outData, 0x20)
success := staticcall(gas, 0x07, inOff, inSize, outOff, outSize)
}
if (GAS_EC_MUL > gas || success == 0) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= GAS_EC_MUL;
state.returnData = outData;
}
// solhint-disable-next-line func-name-mixedcase, function-max-lines
function handlePreC_ECPAIRING(EVM memory state) internal {
// EIP-197
bytes memory inData = state.data;
bytes memory outData;
uint256 success;
uint256 gasFee = 0;
assembly {
let inSize := mload(inData)
// outSize is 32 bytes
let outSize := 0x20
// get free mem ptr
outData := mload(0x40)
// padding up to word size
let memEnd := add(
outData,
and(
add(
add(
add(outData, outSize),
0x20
),
0x1F
),
not(0x1F)
)
)
// update free mem ptr
mstore(0x40, memEnd)
// for correct gas calculation, we have to touch the new highest mem slot
mstore8(memEnd, 0)
// store outData.length
mstore(outData, outSize)
let inOff := add(inData, 0x20)
let outOff := add(outData, 0x20)
let curGas := gas()
success := staticcall(curGas, 0x08, inOff, inSize, outOff, outSize)
gasFee := sub(curGas, gas())
}
// XXX: static warning, if that is not correct anymore then the bytecode changed.
// adjust accordingly ;)
gasFee = (gasFee - 725);
if (gasFee > state.gas || success == 0) {
state.gas = 0;
state.errno = ERROR_OUT_OF_GAS;
return;
}
state.gas -= gasFee;
state.returnData = outData;
}
// 0x0X
// solhint-disable-next-line no-empty-blocks
function handleSTOP(EVM memory state) internal {
}
function handleADD(EVM memory state) internal {
uint a = state.stack.pop();
uint b = state.stack.pop();
uint c;
assembly {
c := add(a, b)
}
state.stack.push(c);
}
function handleMUL(EVM memory state) internal {
uint a = state.stack.pop();
uint b = state.stack.pop();
uint c;
assembly {
c := mul(a, b)
}
state.stack.push(c);
}
function handleSUB(EVM memory state) internal {
uint a = state.stack.pop();