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import { OpCode, StructLog, TransactionTrace } from '@0xproject/types';
import { BigNumber, logUtils } from '@0xproject/utils';
import { addHexPrefix, stripHexPrefix } from 'ethereumjs-util';
import * as fs from 'fs';
import * as _ from 'lodash';
export interface TraceByContractAddress {
[contractAddress: string]: StructLog[];
}
function padZeros(address: string) {
return addHexPrefix(_.padStart(stripHexPrefix(address), 40, '0'));
}
export function getTracesByContractAddress(structLogs: StructLog[], startAddress: string): TraceByContractAddress {
const traceByContractAddress: TraceByContractAddress = {};
let currentTraceSegment = [];
const callStack = [startAddress];
// tslint:disable-next-line: prefer-for-of
for (let i = 0; i < structLogs.length; ++i) {
const structLog = structLogs[i];
if (structLog.depth !== callStack.length - 1) {
throw new Error("Malformed trace. trace depth doesn't match call stack depth");
}
// After that check we have a guarantee that call stack is never empty
// If it would: callStack.length - 1 === structLog.depth === -1
// That means that we can always safely pop from it
currentTraceSegment.push(structLog);
if (
structLog.op === OpCode.CallCode ||
structLog.op === OpCode.StaticCall ||
structLog.op === OpCode.Call ||
structLog.op === OpCode.DelegateCall
) {
const currentAddress = _.last(callStack) as string;
const jumpAddressOffset = structLog.op === OpCode.DelegateCall ? 4 : 2;
const newAddress = padZeros(new BigNumber(addHexPrefix(structLog.stack[jumpAddressOffset])).toString(16));
callStack.push(newAddress);
traceByContractAddress[currentAddress] = (traceByContractAddress[currentAddress] || []).concat(
currentTraceSegment,
);
currentTraceSegment = [];
} else if (
structLog.op === OpCode.Return ||
structLog.op === OpCode.Stop ||
structLog.op === OpCode.Revert ||
structLog.op === OpCode.Invalid ||
structLog.op === OpCode.SelfDestruct
) {
const currentAddress = callStack.pop() as string;
traceByContractAddress[currentAddress] = (traceByContractAddress[currentAddress] || []).concat(
currentTraceSegment,
);
currentTraceSegment = [];
if (structLog.op === OpCode.SelfDestruct) {
// TODO: Record contract bytecode before the selfdestruct and handle that scenario
logUtils.warn(
"Detected a selfdestruct. Sol-cov currently doesn't support that scenario. We'll just skip the trace part for a destructed contract",
);
}
} else if (structLog.op === OpCode.Create) {
// TODO: Extract the new contract address from the stack and handle that scenario
logUtils.warn(
"Detected a contract created from within another contract. Sol-cov currently doesn't support that scenario. We'll just skip that trace",
);
return traceByContractAddress;
}
}
if (callStack.length !== 0) {
throw new Error('Malformed trace. Call stack non empty at the end');
}
if (currentTraceSegment.length !== 0) {
throw new Error('Malformed trace. currentTraceSegment non empty at the end');
}
return traceByContractAddress;
}
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