9ca534b98d
Pulls out the CppFiltParser work into a worker to run in the background and avoid the jank induced by the final convertSymsMapToExpectedSymFormat call. Profiling shows that after this change there is virtually no jank when asking the geckoProfiler API for symbols. MozReview-Commit-ID: CAKMvjLa4dl
65 lines
1.6 KiB
JavaScript
65 lines
1.6 KiB
JavaScript
/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set sts=2 sw=2 et tw=80: */
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/* eslint-env worker */
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"use strict";
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importScripts("resource:///modules/ParseSymbols.jsm");
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class WorkerCppFiltParser {
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constructor(length) {
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this._decoder = new TextDecoder();
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this._index = 0;
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this._approximateLength = 0;
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this._results = new Array(length);
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}
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consume(arrayBuffer) {
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const data = this._decoder.decode(arrayBuffer, {stream: true});
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const lineRegex = /.*\n?/g;
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const buffer = this._currentLine + data;
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let match;
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while ((match = lineRegex.exec(buffer))) {
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let [line] = match;
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if (line[line.length - 1] === "\n") {
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this._processLine(line);
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} else {
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this._currentLine = line;
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break;
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}
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}
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}
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finish() {
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this._processLine(this._currentLine);
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return {symsArray: this._results, approximateLength: this._approximateLength};
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}
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_processLine(line) {
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const trimmed = line.trimRight();
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this._approximateLength += trimmed.length;
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this._results[this._index++] = trimmed;
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}
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}
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let cppFiltParser;
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onmessage = async e => {
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try {
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if (!cppFiltParser) {
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cppFiltParser = new WorkerCppFiltParser();
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}
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if (e.data.finish) {
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const {symsArray, approximateLength} = cppFiltParser.finish();
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const result = ParseSymbols.convertSymsArrayToExpectedSymFormat(symsArray, approximateLength);
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postMessage({result}, result.map(r => r.buffer));
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close();
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} else {
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cppFiltParser.consume(e.data.buffer);
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}
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} catch (error) {
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postMessage({error: error.toString()});
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}
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};
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