trufflesuite/truffle

const codes = {
  0x00: "STOP",
  0x01: "ADD",
  0x02: "MUL",
  0x03: "SUB",
  0x04: "DIV",
  0x05: "SDIV",
  0x06: "MOD",
  0x07: "SMOD",
  0x08: "ADDMOD",
  0x09: "MULMOD",
  0x0a: "EXP",
  0x0b: "SIGNEXTEND",

  // 0x10 range - bit ops
  0x10: "LT",
  0x11: "GT",
  0x12: "SLT",
  0x13: "SGT",
  0x14: "EQ",
  0x15: "ISZERO",
  0x16: "AND",
  0x17: "OR",
  0x18: "XOR",
  0x19: "NOT",
  0x1a: "BYTE",
  0x1b: "SHL",
  0x1c: "SHR",
  0x1d: "SAR",

  // 0x20 range - crypto
  0x20: "SHA3",

  // 0x30 range - closure state
  0x30: "ADDRESS",
  0x31: "BALANCE",
  0x32: "ORIGIN",
  0x33: "CALLER",
  0x34: "CALLVALUE",
  0x35: "CALLDATALOAD",
  0x36: "CALLDATASIZE",
  0x37: "CALLDATACOPY",
  0x38: "CODESIZE",
  0x39: "CODECOPY",
  0x3a: "GASPRICE",
  0x3b: "EXTCODESIZE",
  0x3c: "EXTCODECOPY",
  0x3d: "RETURNDATASIZE",
  0x3e: "RETURNDATACOPY",
  0x3f: "EXTCODEHASH",

  // 0x40 range - block operations
  0x40: "BLOCKHASH",
  0x41: "COINBASE",
  0x42: "TIMESTAMP",
  0x43: "NUMBER",
  0x44: "PREVRANDAO|DIFFICULTY",
  0x45: "GASLIMIT",
  0x46: "CHAINID",
  0x47: "SELFBALANCE",
  0x48: "BASEFEE",

  // 0x50 range - 'storage' and execution
  0x50: "POP",
  0x51: "MLOAD",
  0x52: "MSTORE",
  0x53: "MSTORE8",
  0x54: "SLOAD",
  0x55: "SSTORE",
  0x56: "JUMP",
  0x57: "JUMPI",
  0x58: "PC",
  0x59: "MSIZE",
  0x5a: "GAS",
  0x5b: "JUMPDEST",

  // 0x60 & 0x70 range - pushes
  0x5f: "PUSH0",
  0x60: "PUSH1",
  0x61: "PUSH2",
  0x62: "PUSH3",
  0x63: "PUSH4",
  0x64: "PUSH5",
  0x65: "PUSH6",
  0x66: "PUSH7",
  0x67: "PUSH8",
  0x68: "PUSH9",
  0x69: "PUSH10",
  0x6a: "PUSH11",
  0x6b: "PUSH12",
  0x6c: "PUSH13",
  0x6d: "PUSH14",
  0x6e: "PUSH15",
  0x6f: "PUSH16",
  0x70: "PUSH17",
  0x71: "PUSH18",
  0x72: "PUSH19",
  0x73: "PUSH20",
  0x74: "PUSH21",
  0x75: "PUSH22",
  0x76: "PUSH23",
  0x77: "PUSH24",
  0x78: "PUSH25",
  0x79: "PUSH26",
  0x7a: "PUSH27",
  0x7b: "PUSH28",
  0x7c: "PUSH29",
  0x7d: "PUSH30",
  0x7e: "PUSH31",
  0x7f: "PUSH32",

  // 0x80 range - duplication
  0x80: "DUP1",
  0x81: "DUP2",
  0x82: "DUP3",
  0x83: "DUP4",
  0x84: "DUP5",
  0x85: "DUP6",
  0x86: "DUP7",
  0x87: "DUP8",
  0x88: "DUP9",
  0x89: "DUP10",
  0x8a: "DUP11",
  0x8b: "DUP12",
  0x8c: "DUP13",
  0x8d: "DUP14",
  0x8e: "DUP15",
  0x8f: "DUP16",

  // 0x90 range - swaps
  0x90: "SWAP1",
  0x91: "SWAP2",
  0x92: "SWAP3",
  0x93: "SWAP4",
  0x94: "SWAP5",
  0x95: "SWAP6",
  0x96: "SWAP7",
  0x97: "SWAP8",
  0x98: "SWAP9",
  0x99: "SWAP10",
  0x9a: "SWAP11",
  0x9b: "SWAP12",
  0x9c: "SWAP13",
  0x9d: "SWAP14",
  0x9e: "SWAP15",
  0x9f: "SWAP16",

  // '0xa0' range - logging
  0xa0: "LOG0",
  0xa1: "LOG1",
  0xa2: "LOG2",
  0xa3: "LOG3",
  0xa4: "LOG4",

  // '0xf0' range - closures
  0xf0: "CREATE",
  0xf1: "CALL",
  0xf2: "CALLCODE",
  0xf3: "RETURN",
  0xf4: "DELEGATECALL",
  0xf5: "CREATE2",
  0xfa: "STATICCALL",
  0xfd: "REVERT",
  0xfe: "INVALID",
  0xff: "SELFDESTRUCT"
} as const;

export type OpcodeTable = typeof codes;

export const parseOpcode = (op: number) =>
  op in codes ? codes[op as keyof OpcodeTable] : "INVALID";