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-rw-r--r--application/basilisk/modules/ProcessHangMonitor.jsm398
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diff --git a/application/basilisk/modules/ProcessHangMonitor.jsm b/application/basilisk/modules/ProcessHangMonitor.jsm
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--- a/application/basilisk/modules/ProcessHangMonitor.jsm
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-/* -*- mode: js; indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-var Cc = Components.classes;
-var Ci = Components.interfaces;
-var Cu = Components.utils;
-
-this.EXPORTED_SYMBOLS = ["ProcessHangMonitor"];
-
-Cu.import("resource://gre/modules/Services.jsm");
-
-/**
- * This JSM is responsible for observing content process hang reports
- * and asking the user what to do about them. See nsIHangReport for
- * the platform interface.
- */
-
-var ProcessHangMonitor = {
- /**
- * This timeout is the wait period applied after a user selects "Wait" in
- * an existing notification.
- */
- get WAIT_EXPIRATION_TIME() {
- try {
- return Services.prefs.getIntPref("browser.hangNotification.waitPeriod");
- } catch (ex) {
- return 10000;
- }
- },
-
- /**
- * Collection of hang reports that haven't expired or been dismissed
- * by the user. These are nsIHangReports.
- */
- _activeReports: new Set(),
-
- /**
- * Collection of hang reports that have been suppressed for a short
- * period of time. Value is an nsITimer for when the wait time
- * expires.
- */
- _pausedReports: new Map(),
-
- /**
- * Initialize hang reporting. Called once in the parent process.
- */
- init() {
- Services.obs.addObserver(this, "process-hang-report", false);
- Services.obs.addObserver(this, "clear-hang-report", false);
- Services.obs.addObserver(this, "xpcom-shutdown", false);
- Services.ww.registerNotification(this);
- },
-
- /**
- * Terminate JavaScript associated with the hang being reported for
- * the selected browser in |win|.
- */
- terminateScript(win) {
- this.handleUserInput(win, report => report.terminateScript());
- },
-
- /**
- * Start devtools debugger for JavaScript associated with the hang
- * being reported for the selected browser in |win|.
- */
- debugScript(win) {
- this.handleUserInput(win, report => {
- function callback() {
- report.endStartingDebugger();
- }
-
- report.beginStartingDebugger();
-
- let svc = Cc["@mozilla.org/dom/slow-script-debug;1"].getService(Ci.nsISlowScriptDebug);
- let handler = svc.remoteActivationHandler;
- handler.handleSlowScriptDebug(report.scriptBrowser, callback);
- });
- },
-
- /**
- * Terminate the plugin process associated with a hang being reported
- * for the selected browser in |win|. Will attempt to generate a combined
- * crash report for all processes.
- */
- terminatePlugin(win) {
- this.handleUserInput(win, report => report.terminatePlugin());
- },
-
- /**
- * Dismiss the browser notification and invoke an appropriate action based on
- * the hang type.
- */
- stopIt(win) {
- let report = this.findActiveReport(win.gBrowser.selectedBrowser);
- if (!report) {
- return;
- }
-
- switch (report.hangType) {
- case report.SLOW_SCRIPT:
- this.terminateScript(win);
- break;
- case report.PLUGIN_HANG:
- this.terminatePlugin(win);
- break;
- }
- },
-
- /**
- * Dismiss the notification, clear the report from the active list and set up
- * a new timer to track a wait period during which we won't notify.
- */
- waitLonger(win) {
- let report = this.findActiveReport(win.gBrowser.selectedBrowser);
- if (!report) {
- return;
- }
- // Remove the report from the active list.
- this.removeActiveReport(report);
-
- // NOTE, we didn't call userCanceled on nsIHangReport here. This insures
- // we don't repeatedly generate and cache crash report data for this hang
- // in the process hang reporter. It already has one report for the browser
- // process we want it hold onto.
-
- // Create a new wait timer with notify callback
- let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
- timer.initWithCallback(() => {
- for (let [stashedReport, otherTimer] of this._pausedReports) {
- if (otherTimer === timer) {
- this.removePausedReport(stashedReport);
-
- // We're still hung, so move the report back to the active
- // list and update the UI.
- this._activeReports.add(report);
- this.updateWindows();
- break;
- }
- }
- }, this.WAIT_EXPIRATION_TIME, timer.TYPE_ONE_SHOT);
-
- this._pausedReports.set(report, timer);
-
- // remove the browser notification associated with this hang
- this.updateWindows();
- },
-
- /**
- * If there is a hang report associated with the selected browser in
- * |win|, invoke |func| on that report and stop notifying the user
- * about it.
- */
- handleUserInput(win, func) {
- let report = this.findActiveReport(win.gBrowser.selectedBrowser);
- if (!report) {
- return null;
- }
- this.removeActiveReport(report);
-
- return func(report);
- },
-
- observe(subject, topic, data) {
- switch (topic) {
- case "xpcom-shutdown":
- Services.obs.removeObserver(this, "xpcom-shutdown");
- Services.obs.removeObserver(this, "process-hang-report");
- Services.obs.removeObserver(this, "clear-hang-report");
- Services.ww.unregisterNotification(this);
- break;
-
- case "process-hang-report":
- this.reportHang(subject.QueryInterface(Ci.nsIHangReport));
- break;
-
- case "clear-hang-report":
- this.clearHang(subject.QueryInterface(Ci.nsIHangReport));
- break;
-
- case "domwindowopened":
- // Install event listeners on the new window in case one of
- // its tabs is already hung.
- let win = subject.QueryInterface(Ci.nsIDOMWindow);
- let listener = (ev) => {
- win.removeEventListener("load", listener, true);
- this.updateWindows();
- };
- win.addEventListener("load", listener, true);
- break;
- }
- },
-
- /**
- * Find a active hang report for the given <browser> element.
- */
- findActiveReport(browser) {
- let frameLoader = browser.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader;
- for (let report of this._activeReports) {
- if (report.isReportForBrowser(frameLoader)) {
- return report;
- }
- }
- return null;
- },
-
- /**
- * Find a paused hang report for the given <browser> element.
- */
- findPausedReport(browser) {
- let frameLoader = browser.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader;
- for (let [report, ] of this._pausedReports) {
- if (report.isReportForBrowser(frameLoader)) {
- return report;
- }
- }
- return null;
- },
-
- /**
- * Remove an active hang report from the active list and cancel the timer
- * associated with it.
- */
- removeActiveReport(report) {
- this._activeReports.delete(report);
- this.updateWindows();
- },
-
- /**
- * Remove a paused hang report from the paused list and cancel the timer
- * associated with it.
- */
- removePausedReport(report) {
- let timer = this._pausedReports.get(report);
- if (timer) {
- timer.cancel();
- }
- this._pausedReports.delete(report);
- },
-
- /**
- * Iterate over all XUL windows and ensure that the proper hang
- * reports are shown for each one. Also install event handlers in
- * each window to watch for events that would cause a different hang
- * report to be displayed.
- */
- updateWindows() {
- let e = Services.wm.getEnumerator("navigator:browser");
- while (e.hasMoreElements()) {
- let win = e.getNext();
-
- this.updateWindow(win);
-
- // Only listen for these events if there are active hang reports.
- if (this._activeReports.size) {
- this.trackWindow(win);
- } else {
- this.untrackWindow(win);
- }
- }
- },
-
- /**
- * If there is a hang report for the current tab in |win|, display it.
- */
- updateWindow(win) {
- let report = this.findActiveReport(win.gBrowser.selectedBrowser);
-
- if (report) {
- this.showNotification(win, report);
- } else {
- this.hideNotification(win);
- }
- },
-
- /**
- * Show the notification for a hang.
- */
- showNotification(win, report) {
- let nb = win.document.getElementById("high-priority-global-notificationbox");
- let notification = nb.getNotificationWithValue("process-hang");
- if (notification) {
- return;
- }
-
- let bundle = win.gNavigatorBundle;
-
- let buttons = [{
- label: bundle.getString("processHang.button_stop.label"),
- accessKey: bundle.getString("processHang.button_stop.accessKey"),
- callback() {
- ProcessHangMonitor.stopIt(win);
- }
- },
- {
- label: bundle.getString("processHang.button_wait.label"),
- accessKey: bundle.getString("processHang.button_wait.accessKey"),
- callback() {
- ProcessHangMonitor.waitLonger(win);
- }
- }];
-
-#ifdef MOZ_DEV_EDITION
- if (report.hangType == report.SLOW_SCRIPT) {
- buttons.push({
- label: bundle.getString("processHang.button_debug.label"),
- accessKey: bundle.getString("processHang.button_debug.accessKey"),
- callback() {
- ProcessHangMonitor.debugScript(win);
- }
- });
- }
-#endif
-
- nb.appendNotification(bundle.getString("processHang.label"),
- "process-hang",
- "chrome://browser/content/aboutRobots-icon.png",
- nb.PRIORITY_WARNING_HIGH, buttons);
- },
-
- /**
- * Ensure that no hang notifications are visible in |win|.
- */
- hideNotification(win) {
- let nb = win.document.getElementById("high-priority-global-notificationbox");
- let notification = nb.getNotificationWithValue("process-hang");
- if (notification) {
- nb.removeNotification(notification);
- }
- },
-
- /**
- * Install event handlers on |win| to watch for events that would
- * cause a different hang report to be displayed.
- */
- trackWindow(win) {
- win.gBrowser.tabContainer.addEventListener("TabSelect", this, true);
- win.gBrowser.tabContainer.addEventListener("TabRemotenessChange", this, true);
- },
-
- untrackWindow(win) {
- win.gBrowser.tabContainer.removeEventListener("TabSelect", this, true);
- win.gBrowser.tabContainer.removeEventListener("TabRemotenessChange", this, true);
- },
-
- handleEvent(event) {
- let win = event.target.ownerGlobal;
-
- // If a new tab is selected or if a tab changes remoteness, then
- // we may need to show or hide a hang notification.
-
- if (event.type == "TabSelect" || event.type == "TabRemotenessChange") {
- this.updateWindow(win);
- }
- },
-
- /**
- * Handle a potentially new hang report. If it hasn't been seen
- * before, show a notification for it in all open XUL windows.
- */
- reportHang(report) {
- // If this hang was already reported reset the timer for it.
- if (this._activeReports.has(report)) {
- // if this report is in active but doesn't have a notification associated
- // with it, display a notification.
- this.updateWindows();
- return;
- }
-
- // If this hang was already reported and paused by the user ignore it.
- if (this._pausedReports.has(report)) {
- return;
- }
-
- // On e10s this counts slow-script/hanged-plugin notice only once.
- // This code is not reached on non-e10s.
- if (report.hangType == report.SLOW_SCRIPT) {
- // On non-e10s, SLOW_SCRIPT_NOTICE_COUNT is probed at nsGlobalWindow.cpp
- Services.telemetry.getHistogramById("SLOW_SCRIPT_NOTICE_COUNT").add();
- } else if (report.hangType == report.PLUGIN_HANG) {
- // On non-e10s we have sufficient plugin telemetry probes,
- // so PLUGIN_HANG_NOTICE_COUNT is only probed on e10s.
- Services.telemetry.getHistogramById("PLUGIN_HANG_NOTICE_COUNT").add();
- }
-
- this._activeReports.add(report);
- this.updateWindows();
- },
-
- clearHang(report) {
- this.removeActiveReport(report);
- this.removePausedReport(report);
- report.userCanceled();
- },
-};