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gecko/browser/devtools/debugger/debugger-controller.js

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/* -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* 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";
const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
const DBG_STRINGS_URI = "chrome://browser/locale/devtools/debugger.properties";
const NEW_SOURCE_IGNORED_URLS = ["debugger eval code", "self-hosted", "XStringBundle"];
const NEW_SOURCE_DISPLAY_DELAY = 200; // ms
const FETCH_SOURCE_RESPONSE_DELAY = 200; // ms
const FETCH_EVENT_LISTENERS_DELAY = 200; // ms
const FRAME_STEP_CLEAR_DELAY = 100; // ms
const CALL_STACK_PAGE_SIZE = 25; // frames
// The panel's window global is an EventEmitter firing the following events:
const EVENTS = {
// When the debugger's source editor instance finishes loading or unloading.
EDITOR_LOADED: "Debugger:EditorLoaded",
EDITOR_UNLOADED: "Debugger:EditorUnoaded",
// When new sources are received from the debugger server.
NEW_SOURCE: "Debugger:NewSource",
SOURCES_ADDED: "Debugger:SourcesAdded",
// When a source is shown in the source editor.
SOURCE_SHOWN: "Debugger:EditorSourceShown",
SOURCE_ERROR_SHOWN: "Debugger:EditorSourceErrorShown",
// When scopes, variables, properties and watch expressions are fetched and
// displayed in the variables view.
FETCHED_SCOPES: "Debugger:FetchedScopes",
FETCHED_VARIABLES: "Debugger:FetchedVariables",
FETCHED_PROPERTIES: "Debugger:FetchedProperties",
FETCHED_BUBBLE_PROPERTIES: "Debugger:FetchedBubbleProperties",
FETCHED_WATCH_EXPRESSIONS: "Debugger:FetchedWatchExpressions",
// When a breakpoint has been added or removed on the debugger server.
BREAKPOINT_ADDED: "Debugger:BreakpointAdded",
BREAKPOINT_REMOVED: "Debugger:BreakpointRemoved",
// When a breakpoint has been shown or hidden in the source editor.
BREAKPOINT_SHOWN: "Debugger:BreakpointShown",
BREAKPOINT_HIDDEN: "Debugger:BreakpointHidden",
// When a conditional breakpoint's popup is showing or hiding.
CONDITIONAL_BREAKPOINT_POPUP_SHOWING: "Debugger:ConditionalBreakpointPopupShowing",
CONDITIONAL_BREAKPOINT_POPUP_HIDING: "Debugger:ConditionalBreakpointPopupHiding",
// When event listeners are fetched or event breakpoints are updated.
EVENT_LISTENERS_FETCHED: "Debugger:EventListenersFetched",
EVENT_BREAKPOINTS_UPDATED: "Debugger:EventBreakpointsUpdated",
// When a file search was performed.
FILE_SEARCH_MATCH_FOUND: "Debugger:FileSearch:MatchFound",
FILE_SEARCH_MATCH_NOT_FOUND: "Debugger:FileSearch:MatchNotFound",
// When a function search was performed.
FUNCTION_SEARCH_MATCH_FOUND: "Debugger:FunctionSearch:MatchFound",
FUNCTION_SEARCH_MATCH_NOT_FOUND: "Debugger:FunctionSearch:MatchNotFound",
// When a global text search was performed.
GLOBAL_SEARCH_MATCH_FOUND: "Debugger:GlobalSearch:MatchFound",
GLOBAL_SEARCH_MATCH_NOT_FOUND: "Debugger:GlobalSearch:MatchNotFound",
// After the stackframes are cleared and debugger won't pause anymore.
AFTER_FRAMES_CLEARED: "Debugger:AfterFramesCleared",
// When the options popup is showing or hiding.
OPTIONS_POPUP_SHOWING: "Debugger:OptionsPopupShowing",
OPTIONS_POPUP_HIDDEN: "Debugger:OptionsPopupHidden",
// When the widgets layout has been changed.
LAYOUT_CHANGED: "Debugger:LayoutChanged"
};
// Descriptions for what a stack frame represents after the debugger pauses.
const FRAME_TYPE = {
NORMAL: 0,
CONDITIONAL_BREAKPOINT_EVAL: 1,
WATCH_EXPRESSIONS_EVAL: 2,
PUBLIC_CLIENT_EVAL: 3
};
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/devtools/dbg-client.jsm");
Cu.import("resource:///modules/devtools/shared/event-emitter.js");
Cu.import("resource:///modules/devtools/SimpleListWidget.jsm");
Cu.import("resource:///modules/devtools/BreadcrumbsWidget.jsm");
Cu.import("resource:///modules/devtools/SideMenuWidget.jsm");
Cu.import("resource:///modules/devtools/VariablesView.jsm");
Cu.import("resource:///modules/devtools/VariablesViewController.jsm");
Cu.import("resource:///modules/devtools/ViewHelpers.jsm");
const require = Cu.import("resource://gre/modules/devtools/Loader.jsm", {}).devtools.require;
const promise = require("sdk/core/promise");
const Editor = require("devtools/sourceeditor/editor");
const DebuggerEditor = require("devtools/sourceeditor/debugger.js");
const {Tooltip} = require("devtools/shared/widgets/Tooltip");
const FastListWidget = require("devtools/shared/widgets/FastListWidget");
XPCOMUtils.defineLazyModuleGetter(this, "Parser",
"resource:///modules/devtools/Parser.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "devtools",
"resource://gre/modules/devtools/Loader.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "DevToolsUtils",
"resource://gre/modules/devtools/DevToolsUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "ShortcutUtils",
"resource://gre/modules/ShortcutUtils.jsm");
Object.defineProperty(this, "NetworkHelper", {
get: function() {
return devtools.require("devtools/toolkit/webconsole/network-helper");
},
configurable: true,
enumerable: true
});
/**
* Object defining the debugger controller components.
*/
let DebuggerController = {
/**
* Initializes the debugger controller.
*/
initialize: function() {
dumpn("Initializing the DebuggerController");
this.startupDebugger = this.startupDebugger.bind(this);
this.shutdownDebugger = this.shutdownDebugger.bind(this);
this._onTabNavigated = this._onTabNavigated.bind(this);
this._onTabDetached = this._onTabDetached.bind(this);
// Chrome debugging lives in a different process and needs to handle
// debugger startup and shutdown by itself.
if (window._isChromeDebugger) {
window.addEventListener("DOMContentLoaded", this.startupDebugger, true);
window.addEventListener("unload", this.shutdownDebugger, true);
}
},
/**
* Initializes the view.
*
* @return object
* A promise that is resolved when the debugger finishes startup.
*/
startupDebugger: function() {
if (this._startup) {
return this._startup;
}
// Chrome debugging lives in a different process and needs to handle
// debugger startup by itself.
if (window._isChromeDebugger) {
window.removeEventListener("DOMContentLoaded", this.startupDebugger, true);
}
return this._startup = DebuggerView.initialize().then(() => {
// Chrome debugging needs to initiate the connection by itself.
if (window._isChromeDebugger) {
return this.connect();
} else {
return promise.resolve(null); // Done.
}
});
},
/**
* Destroys the view and disconnects the debugger client from the server.
*
* @return object
* A promise that is resolved when the debugger finishes shutdown.
*/
shutdownDebugger: function() {
if (this._shutdown) {
return this._shutdown;
}
// Chrome debugging lives in a different process and needs to handle
// debugger shutdown by itself.
if (window._isChromeDebugger) {
window.removeEventListener("unload", this.shutdownDebugger, true);
}
return this._shutdown = DebuggerView.destroy().then(() => {
DebuggerView.destroy();
this.SourceScripts.disconnect();
this.StackFrames.disconnect();
this.ThreadState.disconnect();
this.Tracer.disconnect();
this.disconnect();
// Chrome debugging needs to close its parent process on shutdown.
if (window._isChromeDebugger) {
return this._quitApp();
} else {
return promise.resolve(null); // Done.
}
});
},
/**
* Initiates remote or chrome debugging based on the current target,
* wiring event handlers as necessary.
*
* In case of a chrome debugger living in a different process, a socket
* connection pipe is opened as well.
*
* @return object
* A promise that is resolved when the debugger finishes connecting.
*/
connect: function() {
if (this._connection) {
return this._connection;
}
let startedDebugging = promise.defer();
this._connection = startedDebugging.promise;
if (!window._isChromeDebugger) {
let target = this._target;
let { client, form: { chromeDebugger, traceActor }, threadActor } = target;
target.on("close", this._onTabDetached);
target.on("navigate", this._onTabNavigated);
target.on("will-navigate", this._onTabNavigated);
this.client = client;
if (target.chrome) {
this._startChromeDebugging(chromeDebugger, startedDebugging.resolve);
} else {
this._startDebuggingTab(threadActor, startedDebugging.resolve);
const startedTracing = promise.defer();
this._startTracingTab(traceActor, startedTracing.resolve);
return promise.all([startedDebugging.promise, startedTracing.promise]);
}
return startedDebugging.promise;
}
// Chrome debugging needs to make its own connection to the debuggee.
let transport = debuggerSocketConnect(
Prefs.chromeDebuggingHost, Prefs.chromeDebuggingPort);
let client = this.client = new DebuggerClient(transport);
client.addListener("tabNavigated", this._onTabNavigated);
client.addListener("tabDetached", this._onTabDetached);
client.connect(() => {
client.listTabs(aResponse => {
this._startChromeDebugging(aResponse.chromeDebugger, startedDebugging.resolve);
});
});
return startedDebugging.promise;
},
/**
* Disconnects the debugger client and removes event handlers as necessary.
*/
disconnect: function() {
// Return early if the client didn't even have a chance to instantiate.
if (!this.client) {
return;
}
// When debugging local or a remote instance, the connection is closed by
// the RemoteTarget. Chrome debugging needs to specifically close its own
// connection to the debuggee.
if (window._isChromeDebugger) {
this.client.removeListener("tabNavigated", this._onTabNavigated);
this.client.removeListener("tabDetached", this._onTabDetached);
this.client.close();
}
this._connection = null;
this.client = null;
this.activeThread = null;
},
/**
* Called for each location change in the debugged tab.
*
* @param string aType
* Packet type.
* @param object aPacket
* Packet received from the server.
*/
_onTabNavigated: function(aType, aPacket) {
switch (aType) {
case "will-navigate": {
// Reset UI.
DebuggerView.handleTabNavigation();
// Discard all the cached sources *before* the target starts navigating.
// Sources may be fetched during navigation, in which case we don't
// want to hang on to the old source contents.
DebuggerController.SourceScripts.clearCache();
DebuggerController.Parser.clearCache();
SourceUtils.clearCache();
// Prevent performing any actions that were scheduled before navigation.
clearNamedTimeout("new-source");
clearNamedTimeout("event-breakpoints-update");
clearNamedTimeout("event-listeners-fetch");
break;
}
case "navigate": {
this.ThreadState.handleTabNavigation();
this.StackFrames.handleTabNavigation();
this.SourceScripts.handleTabNavigation();
break;
}
}
},
/**
* Called when the debugged tab is closed.
*/
_onTabDetached: function() {
this.shutdownDebugger();
},
/**
* Warn if resuming execution produced a wrongOrder error.
*/
_ensureResumptionOrder: function(aResponse) {
if (aResponse.error == "wrongOrder") {
DebuggerView.Toolbar.showResumeWarning(aResponse.lastPausedUrl);
}
},
/**
* Sets up a debugging session.
*
* @param string aThreadActor
* The remote protocol grip of the tab.
* @param function aCallback
* A function to invoke once the client attaches to the active thread.
*/
_startDebuggingTab: function(aThreadActor, aCallback) {
this.client.attachThread(aThreadActor, (aResponse, aThreadClient) => {
if (!aThreadClient) {
Cu.reportError("Couldn't attach to thread: " + aResponse.error);
return;
}
this.activeThread = aThreadClient;
this.ThreadState.connect();
this.StackFrames.connect();
this.SourceScripts.connect();
aThreadClient.resume(this._ensureResumptionOrder);
if (aCallback) {
aCallback();
}
}, { useSourceMaps: Prefs.sourceMapsEnabled });
},
/**
* Sets up a chrome debugging session.
*
* @param object aChromeDebugger
* The remote protocol grip of the chrome debugger.
* @param function aCallback
* A function to invoke once the client attaches to the active thread.
*/
_startChromeDebugging: function(aChromeDebugger, aCallback) {
this.client.attachThread(aChromeDebugger, (aResponse, aThreadClient) => {
if (!aThreadClient) {
Cu.reportError("Couldn't attach to thread: " + aResponse.error);
return;
}
this.activeThread = aThreadClient;
this.ThreadState.connect();
this.StackFrames.connect();
this.SourceScripts.connect();
aThreadClient.resume(this._ensureResumptionOrder);
if (aCallback) {
aCallback();
}
}, { useSourceMaps: Prefs.sourceMapsEnabled });
},
/**
* Sets up an execution tracing session.
*
* @param object aTraceActor
* The remote protocol grip of the trace actor.
* @param function aCallback
* A function to invoke once the client attaches to the tracer.
*/
_startTracingTab: function(aTraceActor, aCallback) {
this.client.attachTracer(aTraceActor, (response, traceClient) => {
if (!traceClient) {
DevToolsUtils.reportError(new Error("Failed to attach to tracing actor."));
return;
}
this.traceClient = traceClient;
this.Tracer.connect();
if (aCallback) {
aCallback();
}
});
},
/**
* Detach and reattach to the thread actor with useSourceMaps true, blow
* away old sources and get them again.
*/
reconfigureThread: function(aUseSourceMaps) {
this.client.reconfigureThread({ useSourceMaps: aUseSourceMaps }, aResponse => {
if (aResponse.error) {
let msg = "Couldn't reconfigure thread: " + aResponse.message;
Cu.reportError(msg);
dumpn(msg);
return;
}
// Reset the view and fetch all the sources again.
DebuggerView.handleTabNavigation();
this.SourceScripts.handleTabNavigation();
// Update the stack frame list.
this.activeThread._clearFrames();
this.activeThread.fillFrames(CALL_STACK_PAGE_SIZE);
});
},
/**
* Attempts to quit the current process if allowed.
*
* @return object
* A promise that is resolved if the app will quit successfully.
*/
_quitApp: function() {
let deferred = promise.defer();
// Quitting the app is synchronous. Give the returned promise consumers
// a chance to do their thing before killing the process.
Services.tm.currentThread.dispatch({ run: () => {
let quit = Cc["@mozilla.org/supports-PRBool;1"].createInstance(Ci.nsISupportsPRBool);
Services.obs.notifyObservers(quit, "quit-application-requested", null);
// Somebody canceled our quit request.
if (quit.data) {
deferred.reject(quit.data);
} else {
deferred.resolve(quit.data);
Services.startup.quit(Ci.nsIAppStartup.eForceQuit);
}
}}, 0);
return deferred.promise;
},
_startup: null,
_shutdown: null,
_connection: null,
client: null,
activeThread: null
};
/**
* ThreadState keeps the UI up to date with the state of the
* thread (paused/attached/etc.).
*/
function ThreadState() {
this._update = this._update.bind(this);
}
ThreadState.prototype = {
get activeThread() DebuggerController.activeThread,
/**
* Connect to the current thread client.
*/
connect: function() {
dumpn("ThreadState is connecting...");
this.activeThread.addListener("paused", this._update);
this.activeThread.addListener("resumed", this._update);
this.activeThread.pauseOnExceptions(Prefs.pauseOnExceptions,
Prefs.ignoreCaughtExceptions);
this.handleTabNavigation();
},
/**
* Disconnect from the client.
*/
disconnect: function() {
if (!this.activeThread) {
return;
}
dumpn("ThreadState is disconnecting...");
this.activeThread.removeListener("paused", this._update);
this.activeThread.removeListener("resumed", this._update);
},
/**
* Handles any initialization on a tab navigation event issued by the client.
*/
handleTabNavigation: function() {
if (!this.activeThread) {
return;
}
dumpn("Handling tab navigation in the ThreadState");
this._update();
},
/**
* Update the UI after a thread state change.
*/
_update: function(aEvent) {
DebuggerView.Toolbar.toggleResumeButtonState(this.activeThread.state);
if (gTarget && (aEvent == "paused" || aEvent == "resumed")) {
gTarget.emit("thread-" + aEvent);
}
}
};
/**
* Keeps the stack frame list up-to-date, using the thread client's
* stack frame cache.
*/
function StackFrames() {
this._onPaused = this._onPaused.bind(this);
this._onResumed = this._onResumed.bind(this);
this._onFrames = this._onFrames.bind(this);
this._onFramesCleared = this._onFramesCleared.bind(this);
this._onBlackBoxChange = this._onBlackBoxChange.bind(this);
this._onPrettyPrintChange = this._onPrettyPrintChange.bind(this);
this._afterFramesCleared = this._afterFramesCleared.bind(this);
this.evaluate = this.evaluate.bind(this);
}
StackFrames.prototype = {
get activeThread() DebuggerController.activeThread,
currentFrameDepth: -1,
_currentFrameDescription: FRAME_TYPE.NORMAL,
_syncedWatchExpressions: null,
_currentWatchExpressions: null,
_currentBreakpointLocation: null,
_currentEvaluation: null,
_currentException: null,
_currentReturnedValue: null,
/**
* Connect to the current thread client.
*/
connect: function() {
dumpn("StackFrames is connecting...");
this.activeThread.addListener("paused", this._onPaused);
this.activeThread.addListener("resumed", this._onResumed);
this.activeThread.addListener("framesadded", this._onFrames);
this.activeThread.addListener("framescleared", this._onFramesCleared);
this.activeThread.addListener("blackboxchange", this._onBlackBoxChange);
this.activeThread.addListener("prettyprintchange", this._onPrettyPrintChange);
this.handleTabNavigation();
},
/**
* Disconnect from the client.
*/
disconnect: function() {
if (!this.activeThread) {
return;
}
dumpn("StackFrames is disconnecting...");
this.activeThread.removeListener("paused", this._onPaused);
this.activeThread.removeListener("resumed", this._onResumed);
this.activeThread.removeListener("framesadded", this._onFrames);
this.activeThread.removeListener("framescleared", this._onFramesCleared);
this.activeThread.removeListener("blackboxchange", this._onBlackBoxChange);
this.activeThread.removeListener("prettyprintchange", this._onPrettyPrintChange);
clearNamedTimeout("frames-cleared");
},
/**
* Handles any initialization on a tab navigation event issued by the client.
*/
handleTabNavigation: function() {
dumpn("Handling tab navigation in the StackFrames");
// Nothing to do here yet.
},
/**
* Handler for the thread client's paused notification.
*
* @param string aEvent
* The name of the notification ("paused" in this case).
* @param object aPacket
* The response packet.
*/
_onPaused: function(aEvent, aPacket) {
switch (aPacket.why.type) {
// If paused by a breakpoint, store the breakpoint location.
case "breakpoint":
this._currentBreakpointLocation = aPacket.frame.where;
break;
// If paused by a client evaluation, store the evaluated value.
case "clientEvaluated":
this._currentEvaluation = aPacket.why.frameFinished;
break;
// If paused by an exception, store the exception value.
case "exception":
this._currentException = aPacket.why.exception;
break;
// If paused while stepping out of a frame, store the returned value or
// thrown exception.
case "resumeLimit":
if (!aPacket.why.frameFinished) {
break;
} else if (aPacket.why.frameFinished.throw) {
this._currentException = aPacket.why.frameFinished.throw;
} else if (aPacket.why.frameFinished.return) {
this._currentReturnedValue = aPacket.why.frameFinished.return;
}
break;
}
this.activeThread.fillFrames(CALL_STACK_PAGE_SIZE);
DebuggerView.editor.focus();
},
/**
* Handler for the thread client's resumed notification.
*/
_onResumed: function() {
// Prepare the watch expression evaluation string for the next pause.
if (this._currentFrameDescription != FRAME_TYPE.WATCH_EXPRESSIONS_EVAL) {
this._currentWatchExpressions = this._syncedWatchExpressions;
}
},
/**
* Handler for the thread client's framesadded notification.
*/
_onFrames: function() {
// Ignore useless notifications.
if (!this.activeThread || !this.activeThread.cachedFrames.length) {
return;
}
let waitForNextPause = false;
let breakLocation = this._currentBreakpointLocation;
let watchExpressions = this._currentWatchExpressions;
// Conditional breakpoints are { breakpoint, expression } tuples. The
// boolean evaluation of the expression decides if the active thread
// automatically resumes execution or not.
// TODO: handle all of this server-side: Bug 812172.
if (breakLocation) {
// Make sure a breakpoint actually exists at the specified url and line.
let breakpointPromise = DebuggerController.Breakpoints._getAdded(breakLocation);
if (breakpointPromise) {
breakpointPromise.then(({ conditionalExpression: e }) => { if (e) {
// Evaluating the current breakpoint's conditional expression will
// cause the stack frames to be cleared and active thread to pause,
// sending a 'clientEvaluated' packed and adding the frames again.
this.evaluate(e, { depth: 0, meta: FRAME_TYPE.CONDITIONAL_BREAKPOINT_EVAL });
waitForNextPause = true;
}});
}
}
// We'll get our evaluation of the current breakpoint's conditional
// expression the next time the thread client pauses...
if (waitForNextPause) {
return;
}
if (this._currentFrameDescription == FRAME_TYPE.CONDITIONAL_BREAKPOINT_EVAL) {
this._currentFrameDescription = FRAME_TYPE.NORMAL;
// If the breakpoint's conditional expression evaluation is falsy,
// automatically resume execution.
if (VariablesView.isFalsy({ value: this._currentEvaluation.return })) {
this.activeThread.resume(DebuggerController._ensureResumptionOrder);
return;
}
}
// Watch expressions are evaluated in the context of the topmost frame,
// and the results are displayed in the variables view.
// TODO: handle all of this server-side: Bug 832470, comment 14.
if (watchExpressions) {
// Evaluation causes the stack frames to be cleared and active thread to
// pause, sending a 'clientEvaluated' packet and adding the frames again.
this.evaluate(watchExpressions, { depth: 0, meta: FRAME_TYPE.WATCH_EXPRESSIONS_EVAL });
waitForNextPause = true;
}
// We'll get our evaluation of the current watch expressions the next time
// the thread client pauses...
if (waitForNextPause) {
return;
}
if (this._currentFrameDescription == FRAME_TYPE.WATCH_EXPRESSIONS_EVAL) {
this._currentFrameDescription = FRAME_TYPE.NORMAL;
// If an error was thrown during the evaluation of the watch expressions,
// then at least one expression evaluation could not be performed. So
// remove the most recent watch expression and try again.
if (this._currentEvaluation.throw) {
DebuggerView.WatchExpressions.removeAt(0);
DebuggerController.StackFrames.syncWatchExpressions();
return;
}
}
// Make sure the debugger view panes are visible, then refill the frames.
DebuggerView.showInstrumentsPane();
this._refillFrames();
// No additional processing is necessary for this stack frame.
if (this._currentFrameDescription != FRAME_TYPE.NORMAL) {
this._currentFrameDescription = FRAME_TYPE.NORMAL;
}
},
/**
* Fill the StackFrames view with the frames we have in the cache, compressing
* frames which have black boxed sources into single frames.
*/
_refillFrames: function() {
// Make sure all the previous stackframes are removed before re-adding them.
DebuggerView.StackFrames.empty();
for (let frame of this.activeThread.cachedFrames) {
let { depth, where: { url, line }, source } = frame;
let isBlackBoxed = source ? this.activeThread.source(source).isBlackBoxed : false;
let location = NetworkHelper.convertToUnicode(unescape(url));
let title = StackFrameUtils.getFrameTitle(frame);
DebuggerView.StackFrames.addFrame(title, location, line, depth, isBlackBoxed);
}
DebuggerView.StackFrames.selectedDepth = Math.max(this.currentFrameDepth, 0);
DebuggerView.StackFrames.dirty = this.activeThread.moreFrames;
},
/**
* Handler for the thread client's framescleared notification.
*/
_onFramesCleared: function() {
switch (this._currentFrameDescription) {
case FRAME_TYPE.NORMAL:
this._currentEvaluation = null;
this._currentException = null;
this._currentReturnedValue = null;
break;
case FRAME_TYPE.CONDITIONAL_BREAKPOINT_EVAL:
this._currentBreakpointLocation = null;
break;
case FRAME_TYPE.WATCH_EXPRESSIONS_EVAL:
this._currentWatchExpressions = null;
break;
}
// After each frame step (in, over, out), framescleared is fired, which
// forces the UI to be emptied and rebuilt on framesadded. Most of the times
// this is not necessary, and will result in a brief redraw flicker.
// To avoid it, invalidate the UI only after a short time if necessary.
setNamedTimeout("frames-cleared", FRAME_STEP_CLEAR_DELAY, this._afterFramesCleared);
},
/**
* Handler for the debugger's blackboxchange notification.
*/
_onBlackBoxChange: function() {
if (this.activeThread.state == "paused") {
// Hack to avoid selecting the topmost frame after blackboxing a source.
this.currentFrameDepth = NaN;
this._refillFrames();
}
},
/**
* Handler for the debugger's prettyprintchange notification.
*/
_onPrettyPrintChange: function() {
if (this.activeThread.state == "paused") {
this.activeThread.fillFrames(CALL_STACK_PAGE_SIZE);
}
},
/**
* Called soon after the thread client's framescleared notification.
*/
_afterFramesCleared: function() {
// Ignore useless notifications.
if (this.activeThread.cachedFrames.length) {
return;
}
DebuggerView.editor.clearDebugLocation();
DebuggerView.StackFrames.empty();
DebuggerView.Sources.unhighlightBreakpoint();
DebuggerView.WatchExpressions.toggleContents(true);
DebuggerView.Variables.empty(0);
window.emit(EVENTS.AFTER_FRAMES_CLEARED);
},
/**
* Marks the stack frame at the specified depth as selected and updates the
* properties view with the stack frame's data.
*
* @param number aDepth
* The depth of the frame in the stack.
*/
selectFrame: function(aDepth) {
// Make sure the frame at the specified depth exists first.
let frame = this.activeThread.cachedFrames[this.currentFrameDepth = aDepth];
if (!frame) {
return;
}
// Check if the frame does not represent the evaluation of debuggee code.
let { environment, where } = frame;
if (!environment) {
return;
}
// Don't change the editor's location if the execution was paused by a
// public client evaluation. This is useful for adding overlays on
// top of the editor, like a variable inspection popup.
if (this._currentFrameDescription != FRAME_TYPE.PUBLIC_CLIENT_EVAL) {
// Move the editor's caret to the proper url and line.
DebuggerView.setEditorLocation(where.url, where.line);
// Highlight the breakpoint at the specified url and line if it exists.
DebuggerView.Sources.highlightBreakpoint(where, { noEditorUpdate: true });
}
// Don't display the watch expressions textbox inputs in the pane.
DebuggerView.WatchExpressions.toggleContents(false);
// Start recording any added variables or properties in any scope and
// clear existing scopes to create each one dynamically.
DebuggerView.Variables.empty();
// If watch expressions evaluation results are available, create a scope
// to contain all the values.
if (this._syncedWatchExpressions && aDepth == 0) {
let label = L10N.getStr("watchExpressionsScopeLabel");
let scope = DebuggerView.Variables.addScope(label);
// Customize the scope for holding watch expressions evaluations.
scope.descriptorTooltip = false;
scope.contextMenuId = "debuggerWatchExpressionsContextMenu";
scope.separatorStr = L10N.getStr("watchExpressionsSeparatorLabel");
scope.switch = DebuggerView.WatchExpressions.switchExpression;
scope.delete = DebuggerView.WatchExpressions.deleteExpression;
// The evaluation hasn't thrown, so fetch and add the returned results.
this._fetchWatchExpressions(scope, this._currentEvaluation.return);
// The watch expressions scope is always automatically expanded.
scope.expand();
}
do {
// Create a scope to contain all the inspected variables in the
// current environment.
let label = StackFrameUtils.getScopeLabel(environment);
let scope = DebuggerView.Variables.addScope(label);
let innermost = environment == frame.environment;
// Handle special additions to the innermost scope.
if (innermost) {
this._insertScopeFrameReferences(scope, frame);
}
// Handle the expansion of the scope, lazily populating it with the
// variables in the current environment.
DebuggerView.Variables.controller.addExpander(scope, environment);
// The innermost scope is always automatically expanded, because it
// contains the variables in the current stack frame which are likely to
// be inspected.
if (innermost) {
scope.expand();
}
} while ((environment = environment.parent));
// Signal that scope environments have been shown.
window.emit(EVENTS.FETCHED_SCOPES);
},
/**
* Loads more stack frames from the debugger server cache.
*/
addMoreFrames: function() {
this.activeThread.fillFrames(
this.activeThread.cachedFrames.length + CALL_STACK_PAGE_SIZE);
},
/**
* Evaluate an expression in the context of the selected frame.
*
* @param string aExpression
* The expression to evaluate.
* @param object aOptions [optional]
* Additional options for this client evaluation:
* - depth: the frame depth used for evaluation, 0 being the topmost.
* - meta: some meta-description for what this evaluation represents.
* @return object
* A promise that is resolved when the evaluation finishes,
* or rejected if there was no stack frame available or some
* other error occurred.
*/
evaluate: function(aExpression, aOptions = {}) {
let depth = "depth" in aOptions ? aOptions.depth : this.currentFrameDepth;
let frame = this.activeThread.cachedFrames[depth];
if (frame == null) {
return promise.reject(new Error("No stack frame available."));
}
let deferred = promise.defer();
this.activeThread.addOneTimeListener("paused", (aEvent, aPacket) => {
let { type, frameFinished } = aPacket.why;
if (type == "clientEvaluated") {
if (!("terminated" in frameFinished)) {
deferred.resolve(frameFinished);
} else {
deferred.reject(new Error("The execution was abruptly terminated."));
}
} else {
deferred.reject(new Error("Active thread paused unexpectedly."));
}
});
let meta = "meta" in aOptions ? aOptions.meta : FRAME_TYPE.PUBLIC_CLIENT_EVAL;
this._currentFrameDescription = meta;
this.activeThread.eval(frame.actor, aExpression);
return deferred.promise;
},
/**
* Add nodes for special frame references in the innermost scope.
*
* @param Scope aScope
* The scope where the references will be placed into.
* @param object aFrame
* The frame to get some references from.
*/
_insertScopeFrameReferences: function(aScope, aFrame) {
// Add any thrown exception.
if (this._currentException) {
let excRef = aScope.addItem("<exception>", { value: this._currentException });
DebuggerView.Variables.controller.addExpander(excRef, this._currentException);
}
// Add any returned value.
if (this._currentReturnedValue) {
let retRef = aScope.addItem("<return>", { value: this._currentReturnedValue });
DebuggerView.Variables.controller.addExpander(retRef, this._currentReturnedValue);
}
// Add "this".
if (aFrame.this) {
let thisRef = aScope.addItem("this", { value: aFrame.this });
DebuggerView.Variables.controller.addExpander(thisRef, aFrame.this);
}
},
/**
* Adds the watch expressions evaluation results to a scope in the view.
*
* @param Scope aScope
* The scope where the watch expressions will be placed into.
* @param object aExp
* The grip of the evaluation results.
*/
_fetchWatchExpressions: function(aScope, aExp) {
// Fetch the expressions only once.
if (aScope._fetched) {
return;
}
aScope._fetched = true;
// Add nodes for every watch expression in scope.
this.activeThread.pauseGrip(aExp).getPrototypeAndProperties(aResponse => {
let ownProperties = aResponse.ownProperties;
let totalExpressions = DebuggerView.WatchExpressions.itemCount;
for (let i = 0; i < totalExpressions; i++) {
let name = DebuggerView.WatchExpressions.getString(i);
let expVal = ownProperties[i].value;
let expRef = aScope.addItem(name, ownProperties[i]);
DebuggerView.Variables.controller.addExpander(expRef, expVal);
// Revert some of the custom watch expressions scope presentation flags,
// so that they don't propagate to child items.
expRef.switch = null;
expRef.delete = null;
expRef.descriptorTooltip = true;
expRef.separatorStr = L10N.getStr("variablesSeparatorLabel");
}
// Signal that watch expressions have been fetched.
window.emit(EVENTS.FETCHED_WATCH_EXPRESSIONS);
});
},
/**
* Updates a list of watch expressions to evaluate on each pause.
* TODO: handle all of this server-side: Bug 832470, comment 14.
*/
syncWatchExpressions: function() {
let list = DebuggerView.WatchExpressions.getAllStrings();
// Sanity check all watch expressions before syncing them. To avoid
// having the whole watch expressions array throw because of a single
// faulty expression, simply convert it to a string describing the error.
// There's no other information necessary to be offered in such cases.
let sanitizedExpressions = list.map(aString => {
// Reflect.parse throws when it encounters a syntax error.
try {
Parser.reflectionAPI.parse(aString);
return aString; // Watch expression can be executed safely.
} catch (e) {
return "\"" + e.name + ": " + e.message + "\""; // Syntax error.
}
});
if (sanitizedExpressions.length) {
this._syncedWatchExpressions =
this._currentWatchExpressions =
"[" +
sanitizedExpressions.map(aString =>
"eval(\"" +
"try {" +
// Make sure all quotes are escaped in the expression's syntax,
// and add a newline after the statement to avoid comments
// breaking the code integrity inside the eval block.
aString.replace(/"/g, "\\$&") + "\" + " + "'\\n'" + " + \"" +
"} catch (e) {" +
"e.name + ': ' + e.message;" + // TODO: Bug 812765, 812764.
"}" +
"\")"
).join(",") +
"]";
} else {
this._syncedWatchExpressions =
this._currentWatchExpressions = null;
}
this.currentFrameDepth = -1;
this._onFrames();
}
};
/**
* Keeps the source script list up-to-date, using the thread client's
* source script cache.
*/
function SourceScripts() {
this._onNewGlobal = this._onNewGlobal.bind(this);
this._onNewSource = this._onNewSource.bind(this);
this._onSourcesAdded = this._onSourcesAdded.bind(this);
this._onBlackBoxChange = this._onBlackBoxChange.bind(this);
this._onPrettyPrintChange = this._onPrettyPrintChange.bind(this);
}
SourceScripts.prototype = {
get activeThread() DebuggerController.activeThread,
get debuggerClient() DebuggerController.client,
_cache: new Map(),
/**
* Connect to the current thread client.
*/
connect: function() {
dumpn("SourceScripts is connecting...");
this.debuggerClient.addListener("newGlobal", this._onNewGlobal);
this.debuggerClient.addListener("newSource", this._onNewSource);
this.activeThread.addListener("blackboxchange", this._onBlackBoxChange);
this.activeThread.addListener("prettyprintchange", this._onPrettyPrintChange);
this.handleTabNavigation();
},
/**
* Disconnect from the client.
*/
disconnect: function() {
if (!this.activeThread) {
return;
}
dumpn("SourceScripts is disconnecting...");
this.debuggerClient.removeListener("newGlobal", this._onNewGlobal);
this.debuggerClient.removeListener("newSource", this._onNewSource);
this.activeThread.removeListener("blackboxchange", this._onBlackBoxChange);
this.activeThread.addListener("prettyprintchange", this._onPrettyPrintChange);
},
/**
* Clears all the cached source contents.
*/
clearCache: function() {
this._cache.clear();
},
/**
* Handles any initialization on a tab navigation event issued by the client.
*/
handleTabNavigation: function() {
if (!this.activeThread) {
return;
}
dumpn("Handling tab navigation in the SourceScripts");
// Retrieve the list of script sources known to the server from before
// the client was ready to handle "newSource" notifications.
this.activeThread.getSources(this._onSourcesAdded);
},
/**
* Handler for the debugger client's unsolicited newGlobal notification.
*/
_onNewGlobal: function(aNotification, aPacket) {
// TODO: bug 806775, update the globals list using aPacket.hostAnnotations
// from bug 801084.
},
/**
* Handler for the debugger client's unsolicited newSource notification.
*/
_onNewSource: function(aNotification, aPacket) {
// Ignore bogus scripts, e.g. generated from 'clientEvaluate' packets.
if (NEW_SOURCE_IGNORED_URLS.indexOf(aPacket.source.url) != -1) {
return;
}
// Add the source in the debugger view sources container.
DebuggerView.Sources.addSource(aPacket.source, { staged: false });
// Select this source if it's the preferred one.
let preferredValue = DebuggerView.Sources.preferredValue;
if (aPacket.source.url == preferredValue) {
DebuggerView.Sources.selectedValue = preferredValue;
}
// ..or the first entry if there's none selected yet after a while
else {
setNamedTimeout("new-source", NEW_SOURCE_DISPLAY_DELAY, () => {
// If after a certain delay the preferred source still wasn't received,
// just give up on waiting and display the first entry.
if (!DebuggerView.Sources.selectedValue) {
DebuggerView.Sources.selectedIndex = 0;
}
});
}
// If there are any stored breakpoints for this source, display them again,
// both in the editor and the breakpoints pane.
DebuggerController.Breakpoints.updateEditorBreakpoints();
DebuggerController.Breakpoints.updatePaneBreakpoints();
// Make sure the events listeners are up to date.
if (DebuggerView.instrumentsPaneTab == "events-tab") {
DebuggerController.Breakpoints.DOM.scheduleEventListenersFetch();
}
// Signal that a new source has been added.
window.emit(EVENTS.NEW_SOURCE);
},
/**
* Callback for the debugger's active thread getSources() method.
*/
_onSourcesAdded: function(aResponse) {
if (aResponse.error) {
let msg = "Error getting sources: " + aResponse.message;
Cu.reportError(msg);
dumpn(msg);
return;
}
// Add all the sources in the debugger view sources container.
for (let source of aResponse.sources) {
// Ignore bogus scripts, e.g. generated from 'clientEvaluate' packets.
if (NEW_SOURCE_IGNORED_URLS.indexOf(source.url) == -1) {
DebuggerView.Sources.addSource(source, { staged: true });
}
}
// Flushes all the prepared sources into the sources container.
DebuggerView.Sources.commit({ sorted: true });
// Select the preferred source if it exists and was part of the response.
let preferredValue = DebuggerView.Sources.preferredValue;
if (DebuggerView.Sources.containsValue(preferredValue)) {
DebuggerView.Sources.selectedValue = preferredValue;
}
// ..or the first entry if there's no one selected yet.
else if (!DebuggerView.Sources.selectedValue) {
DebuggerView.Sources.selectedIndex = 0;
}
// If there are any stored breakpoints for the sources, display them again,
// both in the editor and the breakpoints pane.
DebuggerController.Breakpoints.updateEditorBreakpoints();
DebuggerController.Breakpoints.updatePaneBreakpoints();
// Signal that sources have been added.
window.emit(EVENTS.SOURCES_ADDED);
},
/**
* Handler for the debugger client's 'blackboxchange' notification.
*/
_onBlackBoxChange: function (aEvent, { url, isBlackBoxed }) {
const item = DebuggerView.Sources.getItemByValue(url);
if (item) {
if (isBlackBoxed) {
item.target.classList.add("black-boxed");
} else {
item.target.classList.remove("black-boxed");
}
}
DebuggerView.Sources.updateToolbarButtonsState();
DebuggerView.maybeShowBlackBoxMessage();
},
/**
* Set the black boxed status of the given source.
*
* @param Object aSource
* The source form.
* @param bool aBlackBoxFlag
* True to black box the source, false to un-black box it.
* @returns Promise
* A promize that resolves to [aSource, isBlackBoxed] or rejects to
* [aSource, error].
*/
setBlackBoxing: function(aSource, aBlackBoxFlag) {
const sourceClient = this.activeThread.source(aSource);
const deferred = promise.defer();
sourceClient[aBlackBoxFlag ? "blackBox" : "unblackBox"](aPacket => {
const { error, message } = aPacket;
if (error) {
let msg = "Couldn't toggle black boxing for " + aSource.url + ": " + message;
dumpn(msg);
Cu.reportError(msg);
deferred.reject([aSource, msg]);
} else {
deferred.resolve([aSource, sourceClient.isBlackBoxed]);
}
});
return deferred.promise;
},
/**
* Toggle the pretty printing of a source's text. All subsequent calls to
* |getText| will return the pretty-toggled text. Nothing will happen for
* non-javascript files.
*
* @param Object aSource
* The source form from the RDP.
* @returns Promise
* A promise that resolves to [aSource, prettyText] or rejects to
* [aSource, error].
*/
togglePrettyPrint: function(aSource) {
// Only attempt to pretty print JavaScript sources.
if (!SourceUtils.isJavaScript(aSource.url, aSource.contentType)) {
return promise.reject([aSource, "Can't prettify non-javascript files."]);
}
const sourceClient = this.activeThread.source(aSource);
const wantPretty = !sourceClient.isPrettyPrinted;
// Only use the existing promise if it is pretty printed.
let textPromise = this._cache.get(aSource.url);
if (textPromise && textPromise.pretty === wantPretty) {
return textPromise;
}
const deferred = promise.defer();
deferred.promise.pretty = wantPretty;
this._cache.set(aSource.url, deferred.promise);
const afterToggle = ({ error, message, source: text }) => {
if (error) {
// Revert the rejected promise from the cache, so that the original
// source's text may be shown when the source is selected.
this._cache.set(aSource.url, textPromise);
deferred.reject([aSource, message || error]);
return;
}
deferred.resolve([aSource, text]);
};
if (wantPretty) {
sourceClient.prettyPrint(Prefs.editorTabSize, afterToggle);
} else {
sourceClient.disablePrettyPrint(afterToggle);
}
return deferred.promise;
},
/**
* Handler for the debugger's prettyprintchange notification.
*/
_onPrettyPrintChange: function(aEvent, { url }) {
// Remove the cached source AST from the Parser, to avoid getting
// wrong locations when searching for functions.
DebuggerController.Parser.clearSource(url);
},
/**
* Gets a specified source's text.
*
* @param object aSource
* The source object coming from the active thread.
* @param function aOnTimeout [optional]
* Function called when the source text takes a long time to fetch,
* but not necessarily failing. Long fetch times don't cause the
* rejection of the returned promise.
* @param number aDelay [optional]
* The amount of time it takes to consider a source slow to fetch.
* If unspecified, it defaults to a predefined value.
* @return object
* A promise that is resolved after the source text has been fetched.
*/
getText: function(aSource, aOnTimeout, aDelay = FETCH_SOURCE_RESPONSE_DELAY) {
// Fetch the source text only once.
let textPromise = this._cache.get(aSource.url);
if (textPromise) {
return textPromise;
}
let deferred = promise.defer();
this._cache.set(aSource.url, deferred.promise);
// If the source text takes a long time to fetch, invoke a callback.
if (aOnTimeout) {
var fetchTimeout = window.setTimeout(() => aOnTimeout(aSource), aDelay);
}
// Get the source text from the active thread.
this.activeThread.source(aSource).source(({ error, message, source: text }) => {
if (aOnTimeout) {
window.clearTimeout(fetchTimeout);
}
if (error) {
deferred.reject([aSource, message || error]);
} else {
deferred.resolve([aSource, text]);
}
});
return deferred.promise;
},
/**
* Starts fetching all the sources, silently.
*
* @param array aUrls
* The urls for the sources to fetch. If fetching a source's text
* takes too long, it will be discarded.
* @return object
* A promise that is resolved after source texts have been fetched.
*/
getTextForSources: function(aUrls) {
let deferred = promise.defer();
let pending = new Set(aUrls);
let fetched = [];
// Can't use promise.all, because if one fetch operation is rejected, then
// everything is considered rejected, thus no other subsequent source will
// be getting fetched. We don't want that. Something like Q's allSettled
// would work like a charm here.
// Try to fetch as many sources as possible.
for (let url of aUrls) {
let sourceItem = DebuggerView.Sources.getItemByValue(url);
let sourceForm = sourceItem.attachment.source;
this.getText(sourceForm, onTimeout).then(onFetch, onError);
}
/* Called if fetching a source takes too long. */
function onTimeout(aSource) {
onError([aSource]);
}
/* Called if fetching a source finishes successfully. */
function onFetch([aSource, aText]) {
// If fetching the source has previously timed out, discard it this time.
if (!pending.has(aSource.url)) {
return;
}
pending.delete(aSource.url);
fetched.push([aSource.url, aText]);
maybeFinish();
}
/* Called if fetching a source failed because of an error. */
function onError([aSource, aError]) {
pending.delete(aSource.url);
maybeFinish();
}
/* Called every time something interesting happens while fetching sources. */
function maybeFinish() {
if (pending.size == 0) {
// Sort the fetched sources alphabetically by their url.
deferred.resolve(fetched.sort(([aFirst], [aSecond]) => aFirst > aSecond));
}
}
return deferred.promise;
}
};
/**
* Tracer update the UI according to the messages exchanged with the tracer
* actor.
*/
function Tracer() {
this._trace = null;
this._idCounter = 0;
this.onTraces = this.onTraces.bind(this);
}
Tracer.prototype = {
get client() {
return DebuggerController.client;
},
get traceClient() {
return DebuggerController.traceClient;
},
get tracing() {
return !!this._trace;
},
/**
* Hooks up the debugger controller with the tracer client.
*/
connect: function() {
this._stack = [];
this.client.addListener("traces", this.onTraces);
},
/**
* Disconnects the debugger controller from the tracer client. Any further
* communcation with the tracer actor will not have any effect on the UI.
*/
disconnect: function() {
this._stack = null;
this.client.removeListener("traces", this.onTraces);
},
/**
* Instructs the tracer actor to start tracing.
*/
startTracing: function(aCallback = () => {}) {
DebuggerView.Tracer.selectTab();
if (this.tracing) {
return;
}
this._trace = "dbg.trace" + Math.random();
this.traceClient.startTrace([
"name",
"location",
"parameterNames",
"depth",
"arguments",
"return",
"throw",
"yield"
], this._trace, (aResponse) => {
const { error } = aResponse;
if (error) {
DevToolsUtils.reportException(error);
this._trace = null;
}
aCallback(aResponse);
});
},
/**
* Instructs the tracer actor to stop tracing.
*/
stopTracing: function(aCallback = () => {}) {
if (!this.tracing) {
return;
}
this.traceClient.stopTrace(this._trace, aResponse => {
const { error } = aResponse;
if (error) {
DevToolsUtils.reportException(error);
}
this._trace = null;
aCallback(aResponse);
});
},
onTraces: function (aEvent, { traces }) {
const tracesLength = traces.length;
let tracesToShow;
if (tracesLength > TracerView.MAX_TRACES) {
tracesToShow = traces.slice(tracesLength - TracerView.MAX_TRACES,
tracesLength);
DebuggerView.Tracer.empty();
this._stack.splice(0, this._stack.length);
} else {
tracesToShow = traces;
}
for (let t of tracesToShow) {
if (t.type == "enteredFrame") {
this._onCall(t);
} else {
this._onReturn(t);
}
}
DebuggerView.Tracer.commit();
},
/**
* Callback for handling a new call frame.
*/
_onCall: function({ name, location, parameterNames, depth, arguments: args }) {
const item = {
name: name,
location: location,
id: this._idCounter++
};
this._stack.push(item);
DebuggerView.Tracer.addTrace({
type: "call",
name: name,
location: location,
depth: depth,
parameterNames: parameterNames,
arguments: args,
frameId: item.id
});
},
/**
* Callback for handling an exited frame.
*/
_onReturn: function(aPacket) {
if (!this._stack.length) {
return;
}
const { name, id, location } = this._stack.pop();
DebuggerView.Tracer.addTrace({
type: aPacket.why,
name: name,
location: location,
depth: aPacket.depth,
frameId: id,
returnVal: aPacket.return || aPacket.throw || aPacket.yield
});
},
/**
* Create an object which has the same interface as a normal object client,
* but since we already have all the information for an object that we will
* ever get (the server doesn't create actors when tracing, just firehoses
* data and forgets about it) just return the data immdiately.
*
* @param Object aObject
* The tracer object "grip" (more like a limited snapshot).
* @returns Object
* The synchronous client object.
*/
syncGripClient: function(aObject) {
return {
get isFrozen() { return aObject.frozen; },
get isSealed() { return aObject.sealed; },
get isExtensible() { return aObject.extensible; },
get ownProperties() { return aObject.ownProperties; },
get prototype() { return null; },
getParameterNames: callback => callback(aObject),
getPrototypeAndProperties: callback => callback(aObject),
getPrototype: callback => callback(aObject),
getOwnPropertyNames: (callback) => {
callback({
ownPropertyNames: aObject.ownProperties
? Object.keys(aObject.ownProperties)
: []
});
},
getProperty: (property, callback) => {
callback({
descriptor: aObject.ownProperties
? aObject.ownProperties[property]
: null
});
},
getDisplayString: callback => callback("[object " + aObject.class + "]"),
getScope: callback => callback({
error: "scopeNotAvailable",
message: "Cannot get scopes for traced objects"
})
};
},
/**
* Wraps object snapshots received from the tracer server so that we can
* differentiate them from long living object grips from the debugger server
* in the variables view.
*
* @param Object aObject
* The object snapshot from the tracer actor.
*/
WrappedObject: function(aObject) {
this.object = aObject;
}
};
/**
* Handles breaking on event listeners in the currently debugged target.
*/
function EventListeners() {
this._onEventListeners = this._onEventListeners.bind(this);
}
EventListeners.prototype = {
/**
* A list of event names on which the debuggee will automatically pause
* when invoked.
*/
activeEventNames: [],
/**
* Updates the list of events types with listeners that, when invoked,
* will automatically pause the debuggee. The respective events are
* retrieved from the UI.
*/
scheduleEventBreakpointsUpdate: function() {
// Make sure we're not sending a batch of closely repeated requests.
// This can easily happen when toggling all events of a certain type.
setNamedTimeout("event-breakpoints-update", 0, () => {
this.activeEventNames = DebuggerView.EventListeners.getCheckedEvents();
gThreadClient.pauseOnDOMEvents(this.activeEventNames);
// Notify that event breakpoints were added/removed on the server.
window.emit(EVENTS.EVENT_BREAKPOINTS_UPDATED);
});
},
/**
* Fetches the currently attached event listeners from the debugee.
*/
scheduleEventListenersFetch: function() {
let getListeners = aCallback => gThreadClient.eventListeners(aResponse => {
if (aResponse.error) {
let msg = "Error getting event listeners: " + aResponse.message;
DevToolsUtils.reportException("scheduleEventListenersFetch", msg);
return;
}
let outstandingListenersDefinitionSite = aResponse.listeners.map(aListener => {
const deferred = promise.defer();
gThreadClient.pauseGrip(aListener.function).getDefinitionSite(aResponse => {
if (aResponse.error) {
const msg = "Error getting function definition site: " + aResponse.message;
DevToolsUtils.reportException("scheduleEventListenersFetch", msg);
deferred.reject(msg);
return;
}
aListener.function.url = aResponse.url;
deferred.resolve(aListener);
});
return deferred.promise;
});
promise.all(outstandingListenersDefinitionSite).then(aListeners => {
this._onEventListeners(aListeners);
// Notify that event listeners were fetched and shown in the view,
// and callback to resume the active thread if necessary.
window.emit(EVENTS.EVENT_LISTENERS_FETCHED);
aCallback && aCallback();
});
});
// Make sure we're not sending a batch of closely repeated requests.
// This can easily happen whenever new sources are fetched.
setNamedTimeout("event-listeners-fetch", FETCH_EVENT_LISTENERS_DELAY, () => {
if (gThreadClient.state != "paused") {
gThreadClient.interrupt(() => getListeners(() => gThreadClient.resume()));
} else {
getListeners();
}
});
},
/**
* Callback for a debugger's successful active thread eventListeners() call.
*/
_onEventListeners: function(aListeners) {
// Add all the listeners in the debugger view event linsteners container.
for (let listener of aListeners) {
DebuggerView.EventListeners.addListener(listener, { staged: true });
}
// Flushes all the prepared events into the event listeners container.
DebuggerView.EventListeners.commit();
}
};
/**
* Handles all the breakpoints in the current debugger.
*/
function Breakpoints() {
this._onEditorBreakpointAdd = this._onEditorBreakpointAdd.bind(this);
this._onEditorBreakpointRemove = this._onEditorBreakpointRemove.bind(this);
this.addBreakpoint = this.addBreakpoint.bind(this);
this.removeBreakpoint = this.removeBreakpoint.bind(this);
}
Breakpoints.prototype = {
/**
* A map of breakpoint promises as tracked by the debugger frontend.
* The keys consist of a string representation of the breakpoint location.
*/
_added: new Map(),
_removing: new Map(),
_disabled: new Map(),
/**
* Adds the source editor breakpoint handlers.
*
* @return object
* A promise that is resolved when the breakpoints finishes initializing.
*/
initialize: function() {
DebuggerView.editor.on("breakpointAdded", this._onEditorBreakpointAdd);
DebuggerView.editor.on("breakpointRemoved", this._onEditorBreakpointRemove);
// Initialization is synchronous, for now.
return promise.resolve(null);
},
/**
* Removes the source editor breakpoint handlers & all the added breakpoints.
*
* @return object
* A promise that is resolved when the breakpoints finishes destroying.
*/
destroy: function() {
DebuggerView.editor.off("breakpointAdded", this._onEditorBreakpointAdd);
DebuggerView.editor.off("breakpointRemoved", this._onEditorBreakpointRemove);
return this.removeAllBreakpoints();
},
/**
* Event handler for new breakpoints that come from the editor.
*
* @param number aLine
* Line number where breakpoint was set.
*/
_onEditorBreakpointAdd: function(_, aLine) {
let url = DebuggerView.Sources.selectedValue;
let location = { url: url, line: aLine + 1 };
// Initialize the breakpoint, but don't update the editor, since this
// callback is invoked because a breakpoint was added in the editor itself.
this.addBreakpoint(location, { noEditorUpdate: true }).then(aBreakpointClient => {
// If the breakpoint client has an "requestedLocation" attached, then
// the original requested placement for the breakpoint wasn't accepted.
// In this case, we need to update the editor with the new location.
if (aBreakpointClient.requestedLocation) {
DebuggerView.editor.removeBreakpoint(aBreakpointClient.requestedLocation.line - 1);
DebuggerView.editor.addBreakpoint(aBreakpointClient.location.line - 1);
}
// Notify that we've shown a breakpoint in the source editor.
window.emit(EVENTS.BREAKPOINT_SHOWN);
});
},
/**
* Event handler for breakpoints that are removed from the editor.
*
* @param number aLine
* Line number where breakpoint was removed.
*/
_onEditorBreakpointRemove: function(_, aLine) {
let url = DebuggerView.Sources.selectedValue;
let location = { url: url, line: aLine + 1 };
// Destroy the breakpoint, but don't update the editor, since this callback
// is invoked because a breakpoint was removed from the editor itself.
this.removeBreakpoint(location, { noEditorUpdate: true }).then(() => {
// Notify that we've hidden a breakpoint in the source editor.
window.emit(EVENTS.BREAKPOINT_HIDDEN);
});
},
/**
* Update the breakpoints in the editor view. This function takes the list of
* breakpoints in the debugger and adds them back into the editor view.
* This is invoked when the selected script is changed, or when new sources
* are received via the _onNewSource and _onSourcesAdded event listeners.
*/
updateEditorBreakpoints: function() {
for (let breakpointPromise of this._addedOrDisabled) {
breakpointPromise.then(aBreakpointClient => {
let currentSourceUrl = DebuggerView.Sources.selectedValue;
let breakpointUrl = aBreakpointClient.location.url;
// Update the view only if the breakpoint is in the currently shown source.
if (currentSourceUrl == breakpointUrl) {
this._showBreakpoint(aBreakpointClient, { noPaneUpdate: true });
}
});
}
},
/**
* Update the breakpoints in the pane view. This function takes the list of
* breakpoints in the debugger and adds them back into the breakpoints pane.
* This is invoked when new sources are received via the _onNewSource and
* _onSourcesAdded event listeners.
*/
updatePaneBreakpoints: function() {
for (let breakpointPromise of this._addedOrDisabled) {
breakpointPromise.then(aBreakpointClient => {
let container = DebuggerView.Sources;
let breakpointUrl = aBreakpointClient.location.url;
// Update the view only if the breakpoint exists in a known source.
if (container.containsValue(breakpointUrl)) {
this._showBreakpoint(aBreakpointClient, { noEditorUpdate: true });
}
});
}
},
/**
* Add a breakpoint.
*
* @param object aLocation
* The location where you want the breakpoint.
* This object must have two properties:
* - url: the breakpoint's source location.
* - line: the breakpoint's line number.
* @param object aOptions [optional]
* Additional options or flags supported by this operation:
* - openPopup: tells if the expression popup should be shown.
* - noEditorUpdate: tells if you want to skip editor updates.
* - noPaneUpdate: tells if you want to skip breakpoint pane updates.
* @return object
* A promise that is resolved after the breakpoint is added, or
* rejected if there was an error.
*/
addBreakpoint: function(aLocation, aOptions = {}) {
// Make sure a proper location is available.
if (!aLocation) {
return promise.reject(new Error("Invalid breakpoint location."));
}
// If the breakpoint was already added, or is currently being added at the
// specified location, then return that promise immediately.
let addedPromise = this._getAdded(aLocation);
if (addedPromise) {
return addedPromise;
}
// If the breakpoint is currently being removed from the specified location,
// then wait for that to finish and retry afterwards.
let removingPromise = this._getRemoving(aLocation);
if (removingPromise) {
return removingPromise.then(() => this.addBreakpoint(aLocation, aOptions));
}
let deferred = promise.defer();
// Remember the breakpoint initialization promise in the store.
let identifier = this.getIdentifier(aLocation);
this._added.set(identifier, deferred.promise);
// Try adding the breakpoint.
gThreadClient.setBreakpoint(aLocation, (aResponse, aBreakpointClient) => {
// If the breakpoint response has an "actualLocation" attached, then
// the original requested placement for the breakpoint wasn't accepted.
if (aResponse.actualLocation) {
// Remember the initialization promise for the new location instead.
let oldIdentifier = identifier;
let newIdentifier = identifier = this.getIdentifier(aResponse.actualLocation);
this._added.delete(oldIdentifier);
this._added.set(newIdentifier, deferred.promise);
// Store the originally requested location in case it's ever needed
// and update the breakpoint client with the actual location.
aBreakpointClient.requestedLocation = aLocation;
aBreakpointClient.location = aResponse.actualLocation;
}
// By default, new breakpoints are always enabled. Disabled breakpoints
// are, in fact, removed from the server but preserved in the frontend,
// so that they may not be forgotten across target navigations.
let disabledPromise = this._disabled.get(identifier);
if (disabledPromise) {
disabledPromise.then(({ conditionalExpression: previousValue }) => {
// Setting a falsy conditional expression is redundant.
if (previousValue) {
aBreakpointClient.conditionalExpression = previousValue;
}
});
this._disabled.delete(identifier);
}
// Preserve information about the breakpoint's line text, to display it
// in the sources pane without requiring fetching the source (for example,
// after the target navigated). Note that this will get out of sync
// if the source text contents change.
let line = aBreakpointClient.location.line - 1;
aBreakpointClient.text = DebuggerView.editor.getText(line).trim();
// Show the breakpoint in the editor and breakpoints pane, and resolve.
this._showBreakpoint(aBreakpointClient, aOptions);
// Notify that we've added a breakpoint.
window.emit(EVENTS.BREAKPOINT_ADDED, aBreakpointClient);
deferred.resolve(aBreakpointClient);
});
return deferred.promise;
},
/**
* Remove a breakpoint.
*
* @param object aLocation
* @see DebuggerController.Breakpoints.addBreakpoint
* @param object aOptions [optional]
* @see DebuggerController.Breakpoints.addBreakpoint
* @return object
* A promise that is resolved after the breakpoint is removed, or
* rejected if there was an error.
*/
removeBreakpoint: function(aLocation, aOptions = {}) {
// Make sure a proper location is available.
if (!aLocation) {
return promise.reject(new Error("Invalid breakpoint location."));
}
// If the breakpoint was already removed, or has never even been added,
// then return a resolved promise immediately.
let addedPromise = this._getAdded(aLocation);
if (!addedPromise) {
return promise.resolve(aLocation);
}
// If the breakpoint is currently being removed from the specified location,
// then return that promise immediately.
let removingPromise = this._getRemoving(aLocation);
if (removingPromise) {
return removingPromise;
}
let deferred = promise.defer();
// Remember the breakpoint removal promise in the store.
let identifier = this.getIdentifier(aLocation);
this._removing.set(identifier, deferred.promise);
// Retrieve the corresponding breakpoint client first.
addedPromise.then(aBreakpointClient => {
// Try removing the breakpoint.
aBreakpointClient.remove(aResponse => {
// If there was an error removing the breakpoint, reject the promise
// and forget about it that the breakpoint may be re-removed later.
if (aResponse.error) {
deferred.reject(aResponse);
return void this._removing.delete(identifier);
}
// When a breakpoint is removed, the frontend may wish to preserve some
// details about it, so that it can be easily re-added later. In such
// cases, breakpoints are marked and stored as disabled, so that they
// may not be forgotten across target navigations.
if (aOptions.rememberDisabled) {
aBreakpointClient.disabled = true;
this._disabled.set(identifier, promise.resolve(aBreakpointClient));
}
// Forget both the initialization and removal promises from the store.
this._added.delete(identifier);
this._removing.delete(identifier);
// Hide the breakpoint from the editor and breakpoints pane, and resolve.
this._hideBreakpoint(aLocation, aOptions);
// Notify that we've removed a breakpoint.
window.emit(EVENTS.BREAKPOINT_REMOVED, aLocation);
deferred.resolve(aLocation);
});
});
return deferred.promise;
},
/**
* Removes all the currently enabled breakpoints.
*
* @return object
* A promise that is resolved after all breakpoints are removed, or
* rejected if there was an error.
*/
removeAllBreakpoints: function() {
/* Gets an array of all the existing breakpoints promises. */
let getActiveBreakpoints = (aPromises, aStore = []) => {
for (let [, breakpointPromise] of aPromises) {
aStore.push(breakpointPromise);
}
return aStore;
}
/* Gets an array of all the removed breakpoints promises. */
let getRemovedBreakpoints = (aClients, aStore = []) => {
for (let breakpointClient of aClients) {
aStore.push(this.removeBreakpoint(breakpointClient.location));
}
return aStore;
}
// First, populate an array of all the currently added breakpoints promises.
// Then, once all the breakpoints clients are retrieved, populate an array
// of all the removed breakpoints promises and wait for their fulfillment.
return promise.all(getActiveBreakpoints(this._added)).then(aBreakpointClients => {
return promise.all(getRemovedBreakpoints(aBreakpointClients));
});
},
/**
* Update the editor and breakpoints pane to show a specified breakpoint.
*
* @param object aBreakpointData
* Information about the breakpoint to be shown.
* This object must have the following properties:
* - location: the breakpoint's source location and line number
* - disabled: the breakpoint's disabled state, boolean
* - text: the breakpoint's line text to be displayed
* @param object aOptions [optional]
* @see DebuggerController.Breakpoints.addBreakpoint
*/
_showBreakpoint: function(aBreakpointData, aOptions = {}) {
let currentSourceUrl = DebuggerView.Sources.selectedValue;
let location = aBreakpointData.location;
// Update the editor if required.
if (!aOptions.noEditorUpdate && !aBreakpointData.disabled) {
if (location.url == currentSourceUrl) {
DebuggerView.editor.addBreakpoint(location.line - 1);
}
}
// Update the breakpoints pane if required.
if (!aOptions.noPaneUpdate) {
DebuggerView.Sources.addBreakpoint(aBreakpointData, aOptions);
}
},
/**
* Update the editor and breakpoints pane to hide a specified breakpoint.
*
* @param object aLocation
* @see DebuggerController.Breakpoints.addBreakpoint
* @param object aOptions [optional]
* @see DebuggerController.Breakpoints.addBreakpoint
*/
_hideBreakpoint: function(aLocation, aOptions = {}) {
let currentSourceUrl = DebuggerView.Sources.selectedValue;
// Update the editor if required.
if (!aOptions.noEditorUpdate) {
if (aLocation.url == currentSourceUrl) {
DebuggerView.editor.removeBreakpoint(aLocation.line - 1);
}
}
// Update the breakpoints pane if required.
if (!aOptions.noPaneUpdate) {
DebuggerView.Sources.removeBreakpoint(aLocation);
}
},
/**
* Gets all Promises for the BreakpointActor client objects that are
* either enabled (added to the server) or disabled (removed from the server,
* but for which some details are preserved).
*/
get _addedOrDisabled() {
for (let [, value] of this._added) yield value;
for (let [, value] of this._disabled) yield value;
},
/**
* Get a Promise for the BreakpointActor client object which is already added
* or currently being added at the given location.
*
* @param object aLocation
* @see DebuggerController.Breakpoints.addBreakpoint
* @return object | null
* A promise that is resolved after the breakpoint is added, or
* null if no breakpoint was found.
*/
_getAdded: function(aLocation) {
return this._added.get(this.getIdentifier(aLocation));
},
/**
* Get a Promise for the BreakpointActor client object which is currently
* being removed from the given location.
*
* @param object aLocation
* @see DebuggerController.Breakpoints.addBreakpoint
* @return object | null
* A promise that is resolved after the breakpoint is removed, or
* null if no breakpoint was found.
*/
_getRemoving: function(aLocation) {
return this._removing.get(this.getIdentifier(aLocation));
},
/**
* Get an identifier string for a given location. Breakpoint promises are
* identified in the store by a string representation of their location.
*
* @param object aLocation
* The location to serialize to a string.
* @return string
* The identifier string.
*/
getIdentifier: function(aLocation) {
return aLocation.url + ":" + aLocation.line;
}
};
/**
* Localization convenience methods.
*/
let L10N = new ViewHelpers.L10N(DBG_STRINGS_URI);
/**
* Shortcuts for accessing various debugger preferences.
*/
let Prefs = new ViewHelpers.Prefs("devtools", {
chromeDebuggingHost: ["Char", "debugger.chrome-debugging-host"],
chromeDebuggingPort: ["Int", "debugger.chrome-debugging-port"],
sourcesWidth: ["Int", "debugger.ui.panes-sources-width"],
instrumentsWidth: ["Int", "debugger.ui.panes-instruments-width"],
panesVisibleOnStartup: ["Bool", "debugger.ui.panes-visible-on-startup"],
variablesSortingEnabled: ["Bool", "debugger.ui.variables-sorting-enabled"],
variablesOnlyEnumVisible: ["Bool", "debugger.ui.variables-only-enum-visible"],
variablesSearchboxVisible: ["Bool", "debugger.ui.variables-searchbox-visible"],
pauseOnExceptions: ["Bool", "debugger.pause-on-exceptions"],
ignoreCaughtExceptions: ["Bool", "debugger.ignore-caught-exceptions"],
sourceMapsEnabled: ["Bool", "debugger.source-maps-enabled"],
prettyPrintEnabled: ["Bool", "debugger.pretty-print-enabled"],
autoPrettyPrint: ["Bool", "debugger.auto-pretty-print"],
tracerEnabled: ["Bool", "debugger.tracer"],
editorTabSize: ["Int", "editor.tabsize"]
});
/**
* Returns true if this is a chrome debugger instance.
* @return boolean
*/
XPCOMUtils.defineLazyGetter(window, "_isChromeDebugger", function() {
// We're inside a single top level XUL window in a different process.
return !(window.frameElement instanceof XULElement);
});
/**
* Convenient way of emitting events from the panel window.
*/
EventEmitter.decorate(this);
/**
* Preliminary setup for the DebuggerController object.
*/
DebuggerController.initialize();
DebuggerController.Parser = new Parser();
DebuggerController.ThreadState = new ThreadState();
DebuggerController.StackFrames = new StackFrames();
DebuggerController.SourceScripts = new SourceScripts();
DebuggerController.Breakpoints = new Breakpoints();
DebuggerController.Breakpoints.DOM = new EventListeners();
DebuggerController.Tracer = new Tracer();
/**
* Export some properties to the global scope for easier access.
*/
Object.defineProperties(window, {
"gTarget": {
get: function() DebuggerController._target
},
"gHostType": {
get: function() DebuggerView._hostType
},
"gClient": {
get: function() DebuggerController.client
},
"gThreadClient": {
get: function() DebuggerController.activeThread
},
"gCallStackPageSize": {
get: function() CALL_STACK_PAGE_SIZE
}
});
/**
* Helper method for debugging.
* @param string
*/
function dumpn(str) {
if (wantLogging) {
dump("DBG-FRONTEND: " + str + "\n");
}
}
let wantLogging = Services.prefs.getBoolPref("devtools.debugger.log");
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