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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 = 50; // ms
const FRAME_STEP_CLEAR_DELAY = 100; // ms
const CALL_STACK_PAGE_SIZE = 25; // frames
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://gre/modules/commonjs/sdk/core/promise.js");
Cu.import("resource:///modules/source-editor.jsm");
Cu.import("resource:///modules/devtools/LayoutHelpers.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");
XPCOMUtils.defineLazyModuleGetter(this, "Parser",
"resource:///modules/devtools/Parser.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "NetworkHelper",
"resource://gre/modules/devtools/NetworkHelper.jsm");
/**
* 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._isInitialized) {
return this._startup.promise;
}
this._isInitialized = true;
// Chrome debugging lives in a different process and needs to handle
// debugger startup by itself.
if (window._isChromeDebugger) {
window.removeEventListener("DOMContentLoaded", this.startupDebugger, true);
}
let deferred = this._startup = Promise.defer();
DebuggerView.initialize(() => {
DebuggerView._isInitialized = true;
// Chrome debugging needs to initiate the connection by itself.
if (window._isChromeDebugger) {
this.connect().then(deferred.resolve);
} else {
deferred.resolve();
}
});
return deferred.promise;
},
/**
* 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._isDestroyed) {
return this._shutdown.promise;
}
this._isDestroyed = true;
this._startup = null;
// Chrome debugging lives in a different process and needs to handle
// debugger shutdown by itself.
if (window._isChromeDebugger) {
window.removeEventListener("unload", this.shutdownDebugger, true);
}
let deferred = this._shutdown = Promise.defer();
DebuggerView.destroy(() => {
DebuggerView._isDestroyed = true;
this.SourceScripts.disconnect();
this.StackFrames.disconnect();
this.ThreadState.disconnect();
this.disconnect();
deferred.resolve();
// Chrome debugging needs to close its parent process on shutdown.
window._isChromeDebugger && this._quitApp();
});
return deferred.promise;
},
/**
* 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.promise;
}
let deferred = this._connection = Promise.defer();
if (!window._isChromeDebugger) {
let target = this._target;
let { client, form, threadActor } = target;
target.on("close", this._onTabDetached);
target.on("navigate", this._onTabNavigated);
target.on("will-navigate", this._onTabNavigated);
if (target.chrome) {
this._startChromeDebugging(client, form.chromeDebugger, deferred.resolve);
} else {
this._startDebuggingTab(client, threadActor, deferred.resolve);
}
return deferred.promise;
}
// Chrome debugging needs to make its own connection to the debuggee.
let transport = debuggerSocketConnect(
Prefs.chromeDebuggingHost, Prefs.chromeDebuggingPort);
let client = new DebuggerClient(transport);
client.addListener("tabNavigated", this._onTabNavigated);
client.addListener("tabDetached", this._onTabDetached);
client.connect((aType, aTraits) => {
client.listTabs((aResponse) => {
this._startChromeDebugging(client, aResponse.chromeDebugger, deferred.resolve);
});
});
return deferred.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) {
if (aType == "will-navigate") {
DebuggerView._handleTabNavigation();
// Discard all the old sources.
DebuggerController.SourceScripts.clearCache();
DebuggerController.Parser.clearCache();
SourceUtils.clearCache();
return;
}
this.ThreadState._handleTabNavigation();
this.StackFrames._handleTabNavigation();
this.SourceScripts._handleTabNavigation();
},
/**
* 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 DebuggerClient aClient
* The debugger client.
* @param string aThreadActor
* The remote protocol grip of the tab.
* @param function aCallback
* A function to invoke once the client attached to the active thread.
*/
_startDebuggingTab: function(aClient, aThreadActor, aCallback) {
if (!aClient) {
Cu.reportError("No client found!");
return;
}
this.client = aClient;
aClient.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 DebuggerClient aClient
* The debugger client.
* @param object aChromeDebugger
* The remote protocol grip of the chrome debugger.
* @param function aCallback
* A function to invoke once the client attached to the active thread.
*/
_startChromeDebugging: function(aClient, aChromeDebugger, aCallback) {
if (!aClient) {
Cu.reportError("No client found!");
return;
}
this.client = aClient;
aClient.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 });
},
/**
* Detach and reattach to the thread actor with useSourceMaps true, blow
* away old scripts and get sources again.
*/
reconfigureThread: function(aUseSourceMaps) {
this.client.reconfigureThread(aUseSourceMaps, (aResponse) => {
if (aResponse.error) {
let msg = "Couldn't reconfigure thread: " + aResponse.message;
Cu.reportError(msg);
dumpn(msg);
return;
}
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.
*/
_quitApp: function() {
let canceled = Cc["@mozilla.org/supports-PRBool;1"]
.createInstance(Ci.nsISupportsPRBool);
Services.obs.notifyObservers(canceled, "quit-application-requested", null);
// Somebody canceled our quit request.
if (canceled.data) {
return;
}
Services.startup.quit(Ci.nsIAppStartup.eAttemptQuit);
},
_isInitialized: false,
_isDestroyed: false,
_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);
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._afterFramesCleared = this._afterFramesCleared.bind(this);
this.evaluate = this.evaluate.bind(this);
}
StackFrames.prototype = {
get activeThread() DebuggerController.activeThread,
autoScopeExpand: false,
currentFrame: null,
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._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);
},
/**
* 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() {
DebuggerView.editor.setDebugLocation(-1);
// Prepare the watch expression evaluation string for the next pause.
if (!this._isWatchExpressionsEvaluation) {
this.currentWatchExpressions = this.syncedWatchExpressions;
}
},
/**
* Handler for the thread client's framesadded notification.
*/
_onFrames: function() {
// Ignore useless notifications.
if (!this.activeThread.cachedFrames.length) {
return;
}
// 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 (this.currentBreakpointLocation) {
let { url, line } = this.currentBreakpointLocation;
let breakpointClient = DebuggerController.Breakpoints.getBreakpoint(url, line);
if (breakpointClient) {
// Make sure a breakpoint actually exists at the specified url and line.
let conditionalExpression = breakpointClient.conditionalExpression;
if (conditionalExpression) {
// 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(conditionalExpression, 0);
this._isConditionalBreakpointEvaluation = true;
return;
}
}
}
// Got our evaluation of the current breakpoint's conditional expression.
if (this._isConditionalBreakpointEvaluation) {
this._isConditionalBreakpointEvaluation = false;
// 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 (this.currentWatchExpressions) {
// Evaluation causes the stack frames to be cleared and active thread to
// pause, sending a 'clientEvaluated' packet and adding the frames again.
this.evaluate(this.currentWatchExpressions, 0);
this._isWatchExpressionsEvaluation = true;
return;
}
// Got our evaluation of the current watch expressions.
if (this._isWatchExpressionsEvaluation) {
this._isWatchExpressionsEvaluation = false;
// 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.
DebuggerView.showInstrumentsPane();
// 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 } } = frame;
let frameLocation = NetworkHelper.convertToUnicode(unescape(url));
let frameTitle = StackFrameUtils.getFrameTitle(frame);
DebuggerView.StackFrames.addFrame(frameTitle, frameLocation, line, depth);
}
if (this.currentFrame == null) {
DebuggerView.StackFrames.selectedDepth = 0;
}
if (this.activeThread.moreFrames) {
DebuggerView.StackFrames.dirty = true;
}
},
/**
* Handler for the thread client's framescleared notification.
*/
_onFramesCleared: function() {
this.currentFrame = null;
this.currentWatchExpressions = null;
this.currentBreakpointLocation = null;
this.currentEvaluation = null;
this.currentException = null;
this.currentReturnedValue = null;
// 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.
window.setTimeout(this._afterFramesCleared, FRAME_STEP_CLEAR_DELAY);
},
/**
* Called soon after the thread client's framescleared notification.
*/
_afterFramesCleared: function() {
// Ignore useless notifications.
if (this.activeThread.cachedFrames.length) {
return;
}
DebuggerView.StackFrames.empty();
DebuggerView.Sources.unhighlightBreakpoint();
DebuggerView.WatchExpressions.toggleContents(true);
DebuggerView.Variables.empty(0);
window.dispatchEvent(document, "Debugger:AfterFramesCleared");
},
/**
* 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.currentFrame = aDepth];
if (!frame) {
return;
}
// Check if the frame does not represent the evaluation of debuggee code.
let { environment, where: { url, line } } = frame;
if (!environment) {
return;
}
// Move the editor's caret to the proper url and line.
DebuggerView.updateEditor(url, line);
// Highlight the breakpoint at the specified url and line if it exists.
DebuggerView.Sources.highlightBreakpoint(url, line);
// 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.
DebuggerView.Variables.createHierarchy();
// Clear existing scopes and 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 || this.autoScopeExpand) {
scope.expand();
}
} while ((environment = environment.parent));
// Signal that variables have been fetched.
window.dispatchEvent(document, "Debugger:FetchedVariables");
DebuggerView.Variables.commitHierarchy();
},
/**
* 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. This is used
* for modifying the value of variables or properties in scope.
*
* @param string aExpression
* The expression to evaluate.
* @param number aFrame [optional]
* The frame depth used for evaluation.
*/
evaluate: function(aExpression, aFrame = this.currentFrame || 0) {
let frame = this.activeThread.cachedFrames[aFrame];
this.activeThread.eval(frame.actor, aExpression);
},
/**
* 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.dispatchEvent(document, "Debugger:FetchedWatchExpressions");
DebuggerView.Variables.commitHierarchy();
});
},
/**
* 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(function(str) {
// Reflect.parse throws when it encounters a syntax error.
try {
Parser.reflectionAPI.parse(str);
return str; // Watch expression can be executed safely.
} catch (e) {
return "\"" + e.name + ": " + e.message + "\""; // Syntax error.
}
});
if (sanitizedExpressions.length) {
this.syncedWatchExpressions =
this.currentWatchExpressions =
"[" +
sanitizedExpressions.map(function(str)
"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.
str.replace(/"/g, "\\$&") + "\" + " + "'\\n'" + " + \"" +
"} catch (e) {" +
"e.name + ': ' + e.message;" + // TODO: Bug 812765, 812764.
"}" +
"\")"
).join(",") +
"]";
} else {
this.syncedWatchExpressions =
this.currentWatchExpressions = null;
}
this.currentFrame = null;
this._onFrames();
}
};
/**
* Keeps the source script list up-to-date, using the thread client's
* source script cache.
*/
function SourceScripts() {
this._cache = new Map(); // Can't use a WeakMap because keys are strings.
this._onNewGlobal = this._onNewGlobal.bind(this);
this._onNewSource = this._onNewSource.bind(this);
this._onSourcesAdded = this._onSourcesAdded.bind(this);
this._onFetch = this._onFetch.bind(this);
this._onTimeout = this._onTimeout.bind(this);
this._onFinished = this._onFinished.bind(this);
}
SourceScripts.prototype = {
get activeThread() DebuggerController.activeThread,
get debuggerClient() DebuggerController.client,
_newSourceTimeout: null,
/**
* 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._handleTabNavigation();
},
/**
* Disconnect from the client.
*/
disconnect: function() {
if (!this.activeThread) {
return;
}
dumpn("SourceScripts is disconnecting...");
window.clearTimeout(this._newSourceTimeout);
this.debuggerClient.removeListener("newGlobal", this._onNewGlobal);
this.debuggerClient.removeListener("newSource", this._onNewSource);
},
/**
* 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");
window.clearTimeout(this._newSourceTimeout);
// 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 });
let container = DebuggerView.Sources;
let preferredValue = container.preferredValue;
// Select this source if it's the preferred one.
if (aPacket.source.url == preferredValue) {
container.selectedValue = preferredValue;
}
// ..or the first entry if there's none selected yet after a while
else {
window.clearTimeout(this._newSourceTimeout);
this._newSourceTimeout = window.setTimeout(function() {
// If after a certain delay the preferred source still wasn't received,
// just give up on waiting and display the first entry.
if (!container.selectedValue) {
container.selectedIndex = 0;
}
}, NEW_SOURCE_DISPLAY_DELAY);
}
// 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();
// Signal that a new script has been added.
window.dispatchEvent(document, "Debugger:AfterNewSource");
},
/**
* Callback for the debugger's active thread getSources() method.
*/
_onSourcesAdded: function(aResponse) {
if (aResponse.error) {
Cu.reportError("Error getting sources: " + aResponse.message);
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) {
continue;
}
DebuggerView.Sources.addSource(source, { staged: true });
}
let container = DebuggerView.Sources;
let preferredValue = container.preferredValue;
// Flushes all the prepared sources into the sources container.
container.commit({ sorted: true });
// Select the preferred source if it exists and was part of the response.
if (container.containsValue(preferredValue)) {
container.selectedValue = preferredValue;
}
// ..or the first entry if there's no one selected yet.
else if (!container.selectedValue) {
container.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 scripts have been added.
window.dispatchEvent(document, "Debugger:AfterSourcesAdded");
},
/**
* Gets a specified source's text.
*
* @param object aSource
* The source object coming from the active thread.
* @param function aCallback
* Function called after the source text has been loaded.
* @param function aTimeout
* Function called when the source text takes too long to fetch.
*/
getText: function(aSource, aCallback, aTimeout) {
// If already loaded, return the source text immediately.
if (aSource.loaded) {
aCallback(aSource);
return;
}
// If the source text takes too long to fetch, invoke a timeout to
// avoid blocking any operations.
if (aTimeout) {
var fetchTimeout = window.setTimeout(() => {
aSource._fetchingTimedOut = true;
aTimeout(aSource);
}, FETCH_SOURCE_RESPONSE_DELAY);
}
// Get the source text from the active thread.
this.activeThread.source(aSource).source((aResponse) => {
if (aTimeout) {
window.clearTimeout(fetchTimeout);
}
if (aResponse.error) {
Cu.reportError("Error loading: " + aSource.url + "\n" + aResponse.message);
return void aCallback(aSource);
}
aSource.loaded = true;
aSource.text = aResponse.source;
aCallback(aSource);
});
},
/**
* Gets all the fetched sources.
*
* @return array
* An array containing [url, text] entries for the fetched sources.
*/
getCache: function() {
let sources = [];
for (let source of this._cache) {
sources.push(source);
}
return sources.sort(([first], [second]) => first > second);
},
/**
* Clears all the fetched sources from cache.
*/
clearCache: function() {
this._cache.clear();
},
/**
* Starts fetching all the sources, silently.
*
* @param array aUrls
* The urls for the sources to fetch.
* @param object aCallbacks [optional]
* An object containing the callback functions to invoke:
* - onFetch: optional, called after each source is fetched
* - onTimeout: optional, called when a source takes too long to fetch
* - onFinished: called when all the sources are fetched
*/
fetchSources: function(aUrls, aCallbacks = {}) {
this._fetchQueue = new Set();
this._fetchCallbacks = aCallbacks;
// Add each new source which needs to be fetched in a queue.
for (let url of aUrls) {
if (!this._cache.has(url)) {
this._fetchQueue.add(url);
}
}
// If all the sources were already fetched, don't do anything special.
if (this._fetchQueue.size == 0) {
this._onFinished();
return;
}
// Start fetching each new source.
for (let url of this._fetchQueue) {
let sourceItem = DebuggerView.Sources.getItemByValue(url);
let sourceObject = sourceItem.attachment.source;
this.getText(sourceObject, this._onFetch, this._onTimeout);
}
},
/**
* Called when a source has been fetched via fetchSources().
*
* @param object aSource
* The source object coming from the active thread.
*/
_onFetch: function(aSource) {
// Remember the source in a cache so we don't have to fetch it again.
this._cache.set(aSource.url, aSource.text);
// Fetch completed before timeout, remove the source from the fetch queue.
this._fetchQueue.delete(aSource.url);
// If this fetch was eventually completed at some point after a timeout,
// don't call any subsequent event listeners.
if (aSource._fetchingTimedOut) {
return;
}
// Invoke the source fetch callback if provided via fetchSources();
if (this._fetchCallbacks.onFetch) {
this._fetchCallbacks.onFetch(aSource);
}
// Check if all sources were fetched and stored in the cache.
if (this._fetchQueue.size == 0) {
this._onFinished();
}
},
/**
* Called when a source's text takes too long to fetch via fetchSources().
*
* @param object aSource
* The source object coming from the active thread.
*/
_onTimeout: function(aSource) {
// Remove the source from the fetch queue.
this._fetchQueue.delete(aSource.url);
// Invoke the source timeout callback if provided via fetchSources();
if (this._fetchCallbacks.onTimeout) {
this._fetchCallbacks.onTimeout(aSource);
}
// Check if the remaining sources were fetched and stored in the cache.
if (this._fetchQueue.size == 0) {
this._onFinished();
}
},
/**
* Called when all the sources have been fetched.
*/
_onFinished: function() {
// Invoke the finish callback if provided via fetchSources();
if (this._fetchCallbacks.onFinished) {
this._fetchCallbacks.onFinished();
}
},
_cache: null,
_fetchQueue: null,
_fetchCallbacks: null
};
/**
* Handles all the breakpoints in the current debugger.
*/
function Breakpoints() {
this._onEditorBreakpointChange = this._onEditorBreakpointChange.bind(this);
this._onEditorBreakpointAdd = this._onEditorBreakpointAdd.bind(this);
this._onEditorBreakpointRemove = this._onEditorBreakpointRemove.bind(this);
this.addBreakpoint = this.addBreakpoint.bind(this);
this.removeBreakpoint = this.removeBreakpoint.bind(this);
this.getBreakpoint = this.getBreakpoint.bind(this);
}
Breakpoints.prototype = {
get activeThread() DebuggerController.ThreadState.activeThread,
get editor() DebuggerView.editor,
/**
* The list of breakpoints in the debugger as tracked by the current
* debugger instance. This is an object where the values are BreakpointActor
* objects received from the client, while the keys are actor names, for
* example "conn0.breakpoint3".
*/
store: {},
/**
* Skip editor breakpoint change events.
*
* This property tells the source editor event handler to skip handling of
* the BREAKPOINT_CHANGE events. This is used when the debugger adds/removes
* breakpoints from the editor. Typically, the BREAKPOINT_CHANGE event handler
* adds/removes events from the debugger, but when breakpoints are added from
* the public debugger API, we need to do things in reverse.
*
* This implementation relies on the fact that the source editor fires the
* BREAKPOINT_CHANGE events synchronously.
*/
_skipEditorBreakpointCallbacks: false,
/**
* Adds the source editor breakpoint handlers.
*/
initialize: function() {
this.editor.addEventListener(
SourceEditor.EVENTS.BREAKPOINT_CHANGE, this._onEditorBreakpointChange);
},
/**
* Removes the source editor breakpoint handlers & all the added breakpoints.
*/
destroy: function() {
this.editor.removeEventListener(
SourceEditor.EVENTS.BREAKPOINT_CHANGE, this._onEditorBreakpointChange);
for each (let breakpointClient in this.store) {
this.removeBreakpoint(breakpointClient);
}
},
/**
* Event handler for breakpoint changes that happen in the editor. This
* function syncs the breakpoints in the editor to those in the debugger.
*
* @param object aEvent
* The SourceEditor.EVENTS.BREAKPOINT_CHANGE event object.
*/
_onEditorBreakpointChange: function(aEvent) {
if (this._skipEditorBreakpointCallbacks) {
return;
}
this._skipEditorBreakpointCallbacks = true;
aEvent.added.forEach(this._onEditorBreakpointAdd, this);
aEvent.removed.forEach(this._onEditorBreakpointRemove, this);
this._skipEditorBreakpointCallbacks = false;
},
/**
* Event handler for new breakpoints that come from the editor.
*
* @param object aEditorBreakpoint
* The breakpoint object coming from the editor.
*/
_onEditorBreakpointAdd: function(aEditorBreakpoint) {
let url = DebuggerView.Sources.selectedValue;
let line = aEditorBreakpoint.line + 1;
this.addBreakpoint({ url: url, line: line }, (aBreakpointClient) => {
// If the breakpoint client has an "actualLocation" 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.actualLocation) {
this.editor.removeBreakpoint(line - 1);
this.editor.addBreakpoint(aBreakpointClient.actualLocation.line - 1);
}
});
},
/**
* Event handler for breakpoints that are removed from the editor.
*
* @param object aEditorBreakpoint
* The breakpoint object that was removed from the editor.
*/
_onEditorBreakpointRemove: function(aEditorBreakpoint) {
let url = DebuggerView.Sources.selectedValue;
let line = aEditorBreakpoint.line + 1;
this.removeBreakpoint(this.getBreakpoint(url, line));
},
/**
* 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 each (let breakpointClient in this.store) {
if (DebuggerView.Sources.selectedValue == breakpointClient.location.url) {
this._showBreakpoint(breakpointClient, {
noPaneUpdate: true,
noPaneHighlight: 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 each (let breakpointClient in this.store) {
if (DebuggerView.Sources.containsValue(breakpointClient.location.url)) {
this._showBreakpoint(breakpointClient, {
noEditorUpdate: true,
noPaneHighlight: true
});
}
}
},
/**
* Add a breakpoint.
*
* @param object aLocation
* The location where you want the breakpoint. This object must have
* two properties:
* - url: the url of the source.
* - line: the line number (starting from 1).
* @param function aCallback [optional]
* Optional function to invoke once the breakpoint is added. The
* callback is invoked with two arguments:
* - aBreakpointClient: the BreakpointActor client object
* - aResponseError: if there was any error
* @param object aFlags [optional]
* An object containing some of the following boolean properties:
* - conditionalExpression: tells this breakpoint's conditional expression
* - 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
* - noPaneHighlight: tells if you don't want to highlight the breakpoint
*/
addBreakpoint: function(aLocation, aCallback, aFlags = {}) {
// Make sure a proper location is available.
if (!aLocation) {
aCallback && aCallback(null, new Error("Invalid breakpoint location."));
return;
}
let breakpointClient = this.getBreakpoint(aLocation.url, aLocation.line);
// If the breakpoint was already added, callback immediately.
if (breakpointClient) {
aCallback && aCallback(breakpointClient);
return;
}
this.activeThread.setBreakpoint(aLocation, (aResponse, aBreakpointClient) => {
let { url, line } = aResponse.actualLocation || aLocation;
// If the response contains a breakpoint that exists in the cache, prevent
// it from being shown in the source editor at an incorrect position.
if (this.getBreakpoint(url, line)) {
this._hideBreakpoint(aBreakpointClient);
return;
}
// If the breakpoint response has an "actualLocation" attached, then
// the original requested placement for the breakpoint wasn't accepted.
if (aResponse.actualLocation) {
// Store the originally requested location in case it's ever needed.
aBreakpointClient.requestedLocation = {
url: aBreakpointClient.location.url,
line: aBreakpointClient.location.line
};
// Store the response actual location to be used.
aBreakpointClient.actualLocation = aResponse.actualLocation;
// Update the breakpoint client with the actual location.
aBreakpointClient.location.url = aResponse.actualLocation.url;
aBreakpointClient.location.line = aResponse.actualLocation.line;
}
// Remember the breakpoint client in the store.
this.store[aBreakpointClient.actor] = aBreakpointClient;
// Attach any specified conditional expression to the breakpoint client.
aBreakpointClient.conditionalExpression = aFlags.conditionalExpression;
// 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).
aBreakpointClient.lineText = DebuggerView.getEditorLineText(line - 1).trim();
// Show the breakpoint in the editor and breakpoints pane.
this._showBreakpoint(aBreakpointClient, aFlags);
// We're done here.
aCallback && aCallback(aBreakpointClient, aResponse.error);
});
},
/**
* Remove a breakpoint.
*
* @param object aBreakpointClient
* The BreakpointActor client object to remove.
* @param function aCallback [optional]
* Optional function to invoke once the breakpoint is removed. The
* callback is invoked with one argument
* - aBreakpointClient: the breakpoint location (url and line)
* @param object aFlags [optional]
* @see DebuggerController.Breakpoints.addBreakpoint
*/
removeBreakpoint: function(aBreakpointClient, aCallback, aFlags = {}) {
// Make sure a proper breakpoint client is available.
if (!aBreakpointClient) {
aCallback && aCallback(null, new Error("Invalid breakpoint client."));
return;
}
let breakpointActor = aBreakpointClient.actor;
// If the breakpoint was already removed, callback immediately.
if (!this.store[breakpointActor]) {
aCallback && aCallback(aBreakpointClient.location);
return;
}
aBreakpointClient.remove(() => {
// Delete the breakpoint client from the store.
delete this.store[breakpointActor];
// Hide the breakpoint from the editor and breakpoints pane.
this._hideBreakpoint(aBreakpointClient, aFlags);
// We're done here.
aCallback && aCallback(aBreakpointClient.location);
});
},
/**
* Update the editor and breakpoints pane to show a specified breakpoint.
*
* @param object aBreakpointClient
* The BreakpointActor client object to show.
* @param object aFlags [optional]
* @see DebuggerController.Breakpoints.addBreakpoint
*/
_showBreakpoint: function(aBreakpointClient, aFlags = {}) {
let currentSourceUrl = DebuggerView.Sources.selectedValue;
let { url, line } = aBreakpointClient.location;
// Update the editor if required.
if (!aFlags.noEditorUpdate) {
if (url == currentSourceUrl) {
this._skipEditorBreakpointCallbacks = true;
this.editor.addBreakpoint(line - 1);
this._skipEditorBreakpointCallbacks = false;
}
}
// Update the breakpoints pane if required.
if (!aFlags.noPaneUpdate) {
DebuggerView.Sources.addBreakpoint({
sourceLocation: url,
lineNumber: line,
lineText: aBreakpointClient.lineText,
actor: aBreakpointClient.actor,
openPopupFlag: aFlags.openPopup
});
}
// Highlight the breakpoint in the pane if required.
if (!aFlags.noPaneHighlight) {
DebuggerView.Sources.highlightBreakpoint(url, line, aFlags);
}
// Notify that we've shown a breakpoint.
window.dispatchEvent(document, "Debugger:BreakpointShown", aBreakpointClient);
},
/**
* Update the editor and breakpoints pane to hide a specified breakpoint.
*
* @param object aBreakpointClient
* The BreakpointActor client object to hide.
* @param object aFlags [optional]
* @see DebuggerController.Breakpoints.addBreakpoint
*/
_hideBreakpoint: function(aBreakpointClient, aFlags = {}) {
let currentSourceUrl = DebuggerView.Sources.selectedValue;
let { url, line } = aBreakpointClient.location;
// Update the editor if required.
if (!aFlags.noEditorUpdate) {
if (url == currentSourceUrl) {
this._skipEditorBreakpointCallbacks = true;
this.editor.removeBreakpoint(line - 1);
this._skipEditorBreakpointCallbacks = false;
}
}
// Update the breakpoints pane if required.
if (!aFlags.noPaneUpdate) {
DebuggerView.Sources.removeBreakpoint(url, line);
}
// Notify that we've hidden a breakpoint.
window.dispatchEvent(document, "Debugger:BreakpointHidden", aBreakpointClient);
},
/**
* Get the BreakpointActor client object at the given location.
*
* @param string aUrl
* The URL of where the breakpoint is.
* @param number aLine
* The line number where the breakpoint is.
* @return object
* The BreakpointActor client object.
*/
getBreakpoint: function(aUrl, aLine) {
for each (let breakpointClient in this.store) {
if (breakpointClient.location.url == aUrl &&
breakpointClient.location.line == aLine) {
return breakpointClient;
}
}
return null;
}
};
/**
* Localization convenience methods.
*/
let L10N = new ViewHelpers.L10N(DBG_STRINGS_URI);
/**
* Shortcuts for accessing various debugger preferences.
*/
let Prefs = new ViewHelpers.Prefs("devtools.debugger", {
chromeDebuggingHost: ["Char", "chrome-debugging-host"],
chromeDebuggingPort: ["Int", "chrome-debugging-port"],
sourcesWidth: ["Int", "ui.panes-sources-width"],
instrumentsWidth: ["Int", "ui.panes-instruments-width"],
panesVisibleOnStartup: ["Bool", "ui.panes-visible-on-startup"],
variablesSortingEnabled: ["Bool", "ui.variables-sorting-enabled"],
variablesOnlyEnumVisible: ["Bool", "ui.variables-only-enum-visible"],
variablesSearchboxVisible: ["Bool", "ui.variables-searchbox-visible"],
pauseOnExceptions: ["Bool", "pause-on-exceptions"],
sourceMapsEnabled: ["Bool", "source-maps-enabled"]
});
/**
* 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);
});
/**
* 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();
/**
* Export some properties to the global scope for easier access.
*/
Object.defineProperties(window, {
"dispatchEvent": {
get: function() ViewHelpers.dispatchEvent,
},
"editor": {
get: function() DebuggerView.editor
},
"gTarget": {
get: function() DebuggerController._target
},
"gClient": {
get: function() DebuggerController.client
},
"gThreadClient": {
get: function() DebuggerController.activeThread
},
"gThreadState": {
get: function() DebuggerController.ThreadState
},
"gStackFrames": {
get: function() DebuggerController.StackFrames
},
"gSourceScripts": {
get: function() DebuggerController.SourceScripts
},
"gBreakpoints": {
get: function() DebuggerController.Breakpoints
},
"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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