forked from mirrors/gecko-dev
6dbd19aac8
The module can dump ELF binaries, Mach-O binaries, and pdb files. So it works for all our supported platforms. The module is currently hosted on https://zealous-rosalind-a98ce8.netlify.com/ , which is a netlify server that serves files from the following repo: https://github.com/mstange/profiler-assets To make all of this look a bit more official, I'm planning on doing two things: - Move the github repo under the devtools-html organization - Get a firefox.com subdomain such as profiler-assets.firefox.com for hosting Depends on D13004 Differential Revision: https://phabricator.services.mozilla.com/D13005 --HG-- extra : moz-landing-system : lando
95 lines
3.7 KiB
JavaScript
95 lines
3.7 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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"use strict";
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const EXPORTED_SYMBOLS = ["ProfilerGetSymbols"];
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ChromeUtils.defineModuleGetter(this, "setTimeout",
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"resource://gre/modules/Timer.jsm");
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ChromeUtils.defineModuleGetter(this, "clearTimeout",
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"resource://gre/modules/Timer.jsm");
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Cu.importGlobalProperties(["fetch"]);
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// This module obtains symbol tables for binaries.
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// It does so with the help of a WASM module which gets pulled in from the
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// internet on demand. We're doing this purely for the purposes of saving on
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// code size. The contents of the WASM module are expected to be static, they
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// are checked against the hash specified below.
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// The WASM code is run on a ChromeWorker thread. It takes the raw byte
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// contents of the to-be-dumped binary (and of an additional optional pdb file
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// on Windows) as its input, and returns a set of typed arrays which make up
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// the symbol table.
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// Don't let the strange looking URLs and strings below scare you.
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// The hash check ensures that the contents of the wasm module are what we
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// expect them to be.
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// The source code is at https://github.com/mstange/profiler-get-symbols/ .
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// Generated from https://github.com/mstange/profiler-get-symbols/commit/0a0aadc68d6196823a5f102feacb2f04424cd681
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const WASM_MODULE_URL =
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"https://zealous-rosalind-a98ce8.netlify.com/wasm/4af7553b4848038c5a1e33a15ec107094bd0572e16fe2a367235bcb50a630b148ac4fe1d165859d7a9bb4ca4e2572c0e.wasm";
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const WASM_MODULE_INTEGRITY =
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"sha384-SvdVO0hIA4xaHjOhXsEHCUvQVy4W/io2cjW8tQpjCxSKxP4dFlhZ16m7TKTiVywO";
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const EXPIRY_TIME_IN_MS = 5 * 60 * 1000; // 5 minutes
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let gCachedWASMModulePromise = null;
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let gCachedWASMModuleExpiryTimer = 0;
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function clearCachedWASMModule() {
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gCachedWASMModulePromise = null;
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gCachedWASMModuleExpiryTimer = 0;
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}
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function getWASMProfilerGetSymbolsModule() {
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if (!gCachedWASMModulePromise) {
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gCachedWASMModulePromise = (async function() {
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const request = new Request(WASM_MODULE_URL, {
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integrity: WASM_MODULE_INTEGRITY,
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credentials: "omit",
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});
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return WebAssembly.compileStreaming(fetch(request));
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})();
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}
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// Reset expiry timer.
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clearTimeout(gCachedWASMModuleExpiryTimer);
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gCachedWASMModuleExpiryTimer = setTimeout(clearCachedWASMModule, EXPIRY_TIME_IN_MS);
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return gCachedWASMModulePromise;
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}
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this.ProfilerGetSymbols = {
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/**
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* Obtain symbols for the binary at the specified location.
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*
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* @param {string} binaryPath The absolute path to the binary on the local
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* file system.
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* @param {string} debugPath The absolute path to the binary's pdb file on the
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* local file system if on Windows, otherwise the same as binaryPath.
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* @param {string} breakpadId The breakpadId for the binary whose symbols
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* should be obtained. This is used for two purposes: 1) to locate the
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* correct single-arch binary in "FatArch" files, and 2) to make sure the
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* binary at the given path is actually the one that we want. If no ID match
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* is found, this function throws (rejects the promise).
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* @returns {Promise} The symbol table in SymbolTableAsTuple format, see the
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* documentation for nsIProfiler.getSymbolTable.
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*/
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async getSymbolTable(binaryPath, debugPath, breakpadId) {
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const module = await getWASMProfilerGetSymbolsModule();
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return new Promise((resolve, reject) => {
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const worker =
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new ChromeWorker("resource://app/modules/ProfilerGetSymbols-worker.js");
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worker.onmessage = (e) => {
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if (e.data.error) {
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reject(e.data.error);
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return;
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}
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resolve(e.data.result);
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};
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worker.postMessage({binaryPath, debugPath, breakpadId, module});
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});
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},
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};
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