import { addressUtils, BigNumber } from '@0xproject/utils'; import { OpCode, StructLog } from 'ethereum-types'; import { addHexPrefix } from 'ethereumjs-util'; import * as _ from 'lodash'; import { ContractData, LineColumn, SingleFileSourceRange } from './types'; export const utils = { compareLineColumn(lhs: LineColumn, rhs: LineColumn): number { return lhs.line !== rhs.line ? lhs.line - rhs.line : lhs.column - rhs.column; }, removeHexPrefix(hex: string): string { const hexPrefix = '0x'; return hex.startsWith(hexPrefix) ? hex.slice(hexPrefix.length) : hex; }, isRangeInside(childRange: SingleFileSourceRange, parentRange: SingleFileSourceRange): boolean { return ( utils.compareLineColumn(parentRange.start, childRange.start) <= 0 && utils.compareLineColumn(childRange.end, parentRange.end) <= 0 ); }, bytecodeToBytecodeRegex(bytecode: string): string { const bytecodeRegex = bytecode // Library linking placeholder: __ConvertLib____________________________ .replace(/_.*_/, '.*') // Last 86 characters is solidity compiler metadata that's different between compilations .replace(/.{86}$/, '') // Libraries contain their own address at the beginning of the code and it's impossible to know it in advance .replace(/^0x730000000000000000000000000000000000000000/, '0x73........................................'); // HACK: Node regexes can't be longer that 32767 characters. Contracts bytecode can. We just truncate the regexes. It's safe in practice. const MAX_REGEX_LENGTH = 32767; const truncatedBytecodeRegex = bytecodeRegex.slice(0, MAX_REGEX_LENGTH); return truncatedBytecodeRegex; }, getContractDataIfExists(contractsData: ContractData[], bytecode: string): ContractData | undefined { if (!bytecode.startsWith('0x')) { throw new Error(`0x hex prefix missing: ${bytecode}`); } const contractData = _.find(contractsData, contractDataCandidate => { const bytecodeRegex = utils.bytecodeToBytecodeRegex(contractDataCandidate.bytecode); const runtimeBytecodeRegex = utils.bytecodeToBytecodeRegex(contractDataCandidate.runtimeBytecode); // We use that function to find by bytecode or runtimeBytecode. Those are quasi-random strings so // collisions are practically impossible and it allows us to reuse that code return !_.isNull(bytecode.match(bytecodeRegex)) || !_.isNull(bytecode.match(runtimeBytecodeRegex)); }); return contractData; }, isCallLike(op: OpCode): boolean { return _.includes([OpCode.CallCode, OpCode.StaticCall, OpCode.Call, OpCode.DelegateCall], op); }, isEndOpcode(op: OpCode): boolean { return _.includes([OpCode.Return, OpCode.Stop, OpCode.Revert, OpCode.Invalid, OpCode.SelfDestruct], op); }, getAddressFromStackEntry(stackEntry: string): string { const hexBase = 16; return addressUtils.padZeros(new BigNumber(addHexPrefix(stackEntry)).toString(hexBase)); }, normalizeStructLogs(structLogs: StructLog[]): StructLog[] { if (structLogs[0].depth === 1) { // Geth uses 1-indexed depth counter whilst ganache starts from 0 const newStructLogs = _.map(structLogs, structLog => ({ ...structLog, depth: structLog.depth - 1, })); return newStructLogs; } return structLogs; }, };