291 lines
8.5 KiB
JavaScript
291 lines
8.5 KiB
JavaScript
const SourceMap = require('./source_map');
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class ContractSource {
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constructor(file, body) {
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let self = this;
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this.file = file;
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this.body = body;
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this.lineLengths = body.split("\n").map((line) => { return line.length; });
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this.lineCount = this.lineLengths.length;
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this.lineOffsets = this.lineLengths.reduce((sum, _elt, i) => {
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sum[i] = (i == 0) ? 0 : self.lineLengths[i-1] + sum[i-1] + 1;
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return sum;
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}, []);
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this.contracts = {};
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}
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sourceMapToLocations(sourceMap) {
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var [offset, length, ..._] = sourceMap.split(":").map((val) => {
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return parseInt(val, 10);
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});
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var locations = {};
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for(let i = 0; i < this.lineCount; i++) {
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if(this.lineOffsets[i+1] <= offset) continue;
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locations.start = {line: i, column: offset - this.lineOffsets[i]};
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break;
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}
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for(var i = locations.start.line; i < this.lineCount; i++) {
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if(this.lineOffsets[i+1] <= offset + length) continue;
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locations.end = {line: i, column: ((offset + length) - this.lineOffsets[i])};
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break;
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}
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// Ensure we return an "end" as a safeguard if the marker ends up to be
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// or surpass the offset for last character.
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if(!locations.end) {
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var lastLine = this.lineCount - 1;
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locations.end = {line: lastLine, column: this.lineLengths[lastLine]};
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}
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// Istanbul likes lines to be 1-indexed, so we'll increment here before returning.
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locations.start.line++;
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locations.end.line++;
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return locations;
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}
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parseSolcOutput(source, contracts) {
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this.id = source.id;
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this.ast = source.ast;
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this.contractBytecode = {};
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for(var contractName in contracts) {
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this.contractBytecode[contractName] = {};
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var contract = contracts[contractName];
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var bytecodeMapping = this.contractBytecode[contractName];
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var opcodes = contract.evm.deployedBytecode.opcodes.trim().split(' ');
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var sourceMaps = contract.evm.deployedBytecode.sourceMap.split(';');
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var bytecodeIdx = 0;
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var pc = 0;
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var instructions = 0;
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do {
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var instruction = opcodes[bytecodeIdx];
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var length = this._instructionLength(instruction);
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bytecodeMapping[pc] = {
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instruction: instruction,
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sourceMap: sourceMaps[instructions],
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seen: false
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};
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pc += length;
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instructions++;
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bytecodeIdx += (length > 1) ? 2 : 1;
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} while(bytecodeIdx < opcodes.length);
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}
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}
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/*eslint complexity: ["error", 27]*/
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generateCodeCoverage(trace) {
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if(!this.ast || !this.contractBytecode) throw new Error('Error generating coverage: solc output was not assigned');
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var coverage = {
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code: this.body.split("\n"),
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l: {},
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path: this.file,
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s: {},
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b: {},
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f: {},
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fnMap: {},
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statementMap: {},
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branchMap: {}
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};
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var nodesRequiringVisiting = [this.ast];
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var sourceMapToNodeType = {};
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do {
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var node = nodesRequiringVisiting.pop();
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if(!node) continue;
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var children = [];
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var markLocations = [];
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switch(node.nodeType) {
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case 'Identifier':
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case 'Literal':
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case 'VariableDeclaration':
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case 'PragmaDirective':
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// We don't need to do anything with these. Just carry on.
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break;
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case 'IfStatement':
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coverage.b[node.id] = [0,0];
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var location = this.sourceMapToLocations(node.src);
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var trueBranchLocation = this.sourceMapToLocations(node.trueBody.src);
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var falseBranchLocation;
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if(node.falseBody) {
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falseBranchLocation = this.sourceMapToLocations(node.falseBody.src);
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} else {
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falseBranchLocation = trueBranchLocation;
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}
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coverage.branchMap[node.id] = {
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type: 'if',
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locations: [trueBranchLocation, falseBranchLocation],
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line: location.start.line
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};
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children = [node.condition]
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.concat(node.trueBody.statements);
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if(node.falseBody) children = children.concat(node.falseBody.statements);
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markLocations = [location, trueBranchLocation, falseBranchLocation];
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if(node.trueBody.statements[0]) {
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node.trueBody.statements[0]._parent = {type: 'b', id: node.id, idx: 0};
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}
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if(node.falseBody && node.falseBody.statements[0]) {
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node.falseBody.statements[0]._parent = {type: 'b', id: node.id, idx: 1};
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}
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sourceMapToNodeType[node.src] = [{type: 'b', id: node.id, body: {loc: location}}];
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break;
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case 'BinaryOperation':
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children = [node.leftExpression, node.rightExpression];
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break;
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case 'Return':
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// Return is a bit of a special case, because the statement src is the
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// return "body". We don't `break` here on purpose so it can share the
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// same logic below.
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node.src = node.expression.src;
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// falls through
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case 'Assignment':
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case 'ExpressionStatement':
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coverage.s[node.id] = 0;
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location = this.sourceMapToLocations(node.src);
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coverage.statementMap[node.id] = location;
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if(!sourceMapToNodeType[node.src]) sourceMapToNodeType[node.src] = [];
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sourceMapToNodeType[node.src].push({
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type: 's',
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id: node.id,
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body: {loc: coverage.statementMap[node.id]},
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parent: node._parent
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});
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children = node.expression ? [node.expression] : [];
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markLocations = [location];
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break;
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case 'ContractDefinition':
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case 'SourceUnit':
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children = node.nodes;
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break;
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case 'FunctionDefinition':
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// Istanbul only wants the function definition, not the body, so we're
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// going to do some fun math here.
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var functionSourceMap = new SourceMap(node.src);
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var functionParametersSourceMap = new SourceMap(node.parameters.src);
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var functionDefinitionSourceMap = new SourceMap(
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functionSourceMap.offset,
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(functionParametersSourceMap.offset + functionParametersSourceMap.length) - functionSourceMap.offset
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).toString();
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var fnName = node.isConstructor ? "(constructor)" : node.name;
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location = this.sourceMapToLocations(functionDefinitionSourceMap);
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coverage.f[node.id] = 0;
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coverage.fnMap[node.id] = {
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name: fnName,
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line: location.start.line,
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loc: location
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};
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// Record function positions.
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sourceMapToNodeType[node.src] = [{type: 'f', id: node.id, body: coverage.fnMap[node.id]}];
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if(node.body) children = node.body.statements;
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markLocations = [location];
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break;
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default:
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// console.log(`Don't know how to handle node type ${node.nodeType}`);
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break;
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}
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nodesRequiringVisiting = nodesRequiringVisiting.concat(children);
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markLocations.forEach((location) => {
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for(var i = location.start.line; i <= location.end.line; i++) {
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coverage.l[i] = 0;
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}
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});
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} while(nodesRequiringVisiting.length > 0);
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var contractMatches = true;
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for(var contractName in this.contractBytecode) {
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var bytecode = this.contractBytecode[contractName];
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// Try to match the contract to the bytecode. If it doesn't,
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// then we bail.
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contractMatches = trace.structLogs.every((step) => { return bytecode[step.pc]; });
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if(!contractMatches) break;
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trace.structLogs.forEach((step) => {
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step = bytecode[step.pc];
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if(!step.sourceMap || step.sourceMap == '') return;
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var nodes = sourceMapToNodeType[step.sourceMap];
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if(!nodes) return;
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var recordedLineHit = false;
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nodes.forEach((node) => {
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if(node.body && node.body.loc && !recordedLineHit) {
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for(var line = node.body.loc.start.line; line <= node.body.loc.end.line; line++) {
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coverage.l[line]++;
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}
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recordedLineHit = true;
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}
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if(node.type != 'b') coverage[node.type][node.id]++;
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if(!node.parent) return;
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switch(node.parent.type) {
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case 'b':
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coverage.b[node.parent.id][node.parent.idx]++;
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break;
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default:
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// do nothing
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}
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});
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});
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}
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return coverage;
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}
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_instructionLength(instruction) {
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if(instruction.indexOf('PUSH') == -1) return 1;
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return parseInt(instruction.match(/PUSH(\d+)/m)[1], 10) + 1;
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}
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}
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module.exports = ContractSource;
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