c8eb3cc7f1
In order to rewrite the Gecko Profiler add-on as a WebExtension, we need an API for the profiler which allows us to control the nsIProfiler, and symbolicate the stacks that it provides. This is the implementation of the simpler parts of that API. TODO: - Support profiling of remote targets through a new devtools API. - Support the dump_syms breakpad code which was asm.js in the old extension by directly calling into native code. - Figure out a faster way to send the large volume of data from getSymbols all the way from our extension down to the content process and then into the page's context. MozReview-Commit-ID: JzDbV4l2eXd
60 lines
1.5 KiB
JavaScript
60 lines
1.5 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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/* globals OS, ParseSymbols */
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"use strict";
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importScripts("resource://gre/modules/osfile.jsm");
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importScripts("resource:///modules/ParseSymbols.jsm");
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async function fetchSymbolFile(url) {
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const response = await fetch(url);
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if (!response.ok) {
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throw new Error(`got error status ${response.status}`);
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}
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return response.text();
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}
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function parse(text) {
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const syms = new Map();
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// Lines look like this:
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//
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// PUBLIC 3fc74 0 test_public_symbol
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//
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// FUNC 40330 8e 0 test_func_symbol
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const symbolRegex = /\nPUBLIC ([0-9a-f]+) [0-9a-f]+ (.*)|\nFUNC ([0-9a-f]+) [0-9a-f]+ [0-9a-f]+ (.*)/g;
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let match;
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let approximateLength = 0;
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while ((match = symbolRegex.exec(text))) {
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const [address0, symbol0, address1, symbol1] = match.slice(1);
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const address = parseInt(address0 || address1, 16);
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const sym = (symbol0 || symbol1).trimRight();
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syms.set(address, sym);
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approximateLength += sym.length;
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}
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return ParseSymbols.convertSymsMapToExpectedSymFormat(syms, approximateLength);
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}
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onmessage = async e => {
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try {
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let text;
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if (e.data.filepath) {
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text = await OS.File.read(e.data.filepath, {encoding: "utf-8"});
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} else if (e.data.url) {
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text = await fetchSymbolFile(e.data.url);
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}
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const result = parse(text);
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postMessage({result}, result.map(r => r.buffer));
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} catch (error) {
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postMessage({error: error.toString()});
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}
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close();
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};
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