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import {
AbstractArtifactAdapter,
BranchCoverage,
collectCoverageEntries,
ContractData,
Coverage,
FunctionCoverage,
FunctionDescription,
SingleFileSubtraceHandler,
SourceRange,
StatementCoverage,
StatementDescription,
Subtrace,
TraceCollector,
TraceInfo,
TraceInfoSubprovider,
utils,
} from '@0x/sol-tracing-utils';
import * as _ from 'lodash';
/**
* This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
* It's used to compute your code coverage while running solidity tests.
*/
export class CoverageSubprovider extends TraceInfoSubprovider {
private readonly _coverageCollector: TraceCollector;
/**
* Instantiates a CoverageSubprovider instance
* @param artifactAdapter Adapter for used artifacts format (0x, truffle, giveth, etc.)
* @param defaultFromAddress default from address to use when sending transactions
* @param isVerbose If true, we will log any unknown transactions. Otherwise we will ignore them
*/
constructor(artifactAdapter: AbstractArtifactAdapter, defaultFromAddress: string, isVerbose: boolean = true) {
const traceCollectionSubproviderConfig = {
shouldCollectTransactionTraces: true,
shouldCollectGasEstimateTraces: true,
shouldCollectCallTraces: true,
};
super(defaultFromAddress, traceCollectionSubproviderConfig);
this._coverageCollector = new TraceCollector(artifactAdapter, isVerbose, coverageHandler);
}
protected async _handleTraceInfoAsync(traceInfo: TraceInfo): Promise<void> {
await this._coverageCollector.computeSingleTraceCoverageAsync(traceInfo);
}
/**
* Write the test coverage results to a file in Istanbul format.
*/
public async writeCoverageAsync(): Promise<void> {
await this._coverageCollector.writeOutputAsync();
}
}
/**
* Computed partial coverage for a single file & subtrace.
* @param contractData Contract metadata (source, srcMap, bytecode)
* @param subtrace A subset of a transcation/call trace that was executed within that contract
* @param pcToSourceRange A mapping from program counters to source ranges
* @param fileIndex Index of a file to compute coverage for
* @return Partial istanbul coverage for that file & subtrace
*/
export const coverageHandler: SingleFileSubtraceHandler = (
contractData: ContractData,
subtrace: Subtrace,
pcToSourceRange: { [programCounter: number]: SourceRange },
fileIndex: number,
): Coverage => {
const absoluteFileName = contractData.sources[fileIndex];
const coverageEntriesDescription = collectCoverageEntries(contractData.sourceCodes[fileIndex]);
// if the source wasn't provided for the fileIndex, we can't cover the file
if (_.isUndefined(coverageEntriesDescription)) {
return {};
}
let sourceRanges = _.map(subtrace, structLog => pcToSourceRange[structLog.pc]);
sourceRanges = _.compact(sourceRanges); // Some PC's don't map to a source range and we just ignore them.
// By default lodash does a shallow object comparison. We JSON.stringify them and compare as strings.
sourceRanges = _.uniqBy(sourceRanges, s => JSON.stringify(s)); // We don't care if one PC was covered multiple times within a single transaction
sourceRanges = _.filter(sourceRanges, sourceRange => sourceRange.fileName === absoluteFileName);
const branchCoverage: BranchCoverage = {};
const branchIds = _.keys(coverageEntriesDescription.branchMap);
for (const branchId of branchIds) {
const branchDescription = coverageEntriesDescription.branchMap[branchId];
const branchIndexToIsBranchCovered = _.map(branchDescription.locations, location => {
const isBranchCovered = _.some(sourceRanges, range => utils.isRangeInside(range.location, location));
const timesBranchCovered = Number(isBranchCovered);
return timesBranchCovered;
});
branchCoverage[branchId] = branchIndexToIsBranchCovered;
}
const statementCoverage: StatementCoverage = {};
const statementIds = _.keys(coverageEntriesDescription.statementMap);
for (const statementId of statementIds) {
const statementDescription = coverageEntriesDescription.statementMap[statementId];
const isStatementCovered = _.some(sourceRanges, range =>
utils.isRangeInside(range.location, statementDescription),
);
const timesStatementCovered = Number(isStatementCovered);
statementCoverage[statementId] = timesStatementCovered;
}
const functionCoverage: FunctionCoverage = {};
const functionIds = _.keys(coverageEntriesDescription.fnMap);
for (const fnId of functionIds) {
const functionDescription = coverageEntriesDescription.fnMap[fnId];
const isFunctionCovered = _.some(sourceRanges, range =>
utils.isRangeInside(range.location, functionDescription.loc),
);
const timesFunctionCovered = Number(isFunctionCovered);
functionCoverage[fnId] = timesFunctionCovered;
}
// HACK: Solidity doesn't emit any opcodes that map back to modifiers with no args, that's why we map back to the
// function range and check if there is any covered statement within that range.
for (const modifierStatementId of coverageEntriesDescription.modifiersStatementIds) {
if (statementCoverage[modifierStatementId]) {
// Already detected as covered
continue;
}
const modifierDescription = coverageEntriesDescription.statementMap[modifierStatementId];
const enclosingFunction = _.find(coverageEntriesDescription.fnMap, functionDescription =>
utils.isRangeInside(modifierDescription, functionDescription.loc),
) as FunctionDescription;
const isModifierCovered = _.some(
coverageEntriesDescription.statementMap,
(statementDescription: StatementDescription, statementId: number) => {
const isInsideTheModifierEnclosingFunction = utils.isRangeInside(
statementDescription,
enclosingFunction.loc,
);
const isCovered = statementCoverage[statementId];
return isInsideTheModifierEnclosingFunction && isCovered;
},
);
const timesModifierCovered = Number(isModifierCovered);
statementCoverage[modifierStatementId] = timesModifierCovered;
}
const partialCoverage = {
[absoluteFileName]: {
...coverageEntriesDescription,
path: absoluteFileName,
f: functionCoverage,
s: statementCoverage,
b: branchCoverage,
},
};
return partialCoverage;
};
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