mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-17 12:55:56 +00:00
514 lines
16 KiB
JavaScript
514 lines
16 KiB
JavaScript
/* 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";
|
|
|
|
// A CommonJS module loader that is designed to run inside a worker debugger.
|
|
// We can't simply use the SDK module loader, because it relies heavily on
|
|
// Components, which isn't available in workers.
|
|
//
|
|
// In principle, the standard instance of the worker loader should provide the
|
|
// same built-in modules as its devtools counterpart, so that both loaders are
|
|
// interchangable on the main thread, making them easier to test.
|
|
//
|
|
// On the worker thread, some of these modules, in particular those that rely on
|
|
// the use of Components, and for which the worker debugger doesn't provide an
|
|
// alternative API, will be replaced by vacuous objects. Consequently, they can
|
|
// still be required, but any attempts to use them will lead to an exception.
|
|
|
|
this.EXPORTED_SYMBOLS = ["WorkerDebuggerLoader", "worker"];
|
|
|
|
// Some notes on module ids and URLs:
|
|
//
|
|
// An id is either a relative id or an absolute id. An id is relative if and
|
|
// only if it starts with a dot. An absolute id is a normalized id if and only
|
|
// if it contains no redundant components.
|
|
//
|
|
// Every normalized id is a URL. A URL is either an absolute URL or a relative
|
|
// URL. A URL is absolute if and only if it starts with a scheme name followed
|
|
// by a colon and 2 or 3 slashes.
|
|
|
|
/**
|
|
* Convert the given relative id to an absolute id.
|
|
*
|
|
* @param String id
|
|
* The relative id to be resolved.
|
|
* @param String baseId
|
|
* The absolute base id to resolve the relative id against.
|
|
*
|
|
* @return String
|
|
* An absolute id
|
|
*/
|
|
function resolveId(id, baseId) {
|
|
return baseId + "/../" + id;
|
|
};
|
|
|
|
/**
|
|
* Convert the given absolute id to a normalized id.
|
|
*
|
|
* @param String id
|
|
* The absolute id to be normalized.
|
|
*
|
|
* @return String
|
|
* A normalized id.
|
|
*/
|
|
function normalizeId(id) {
|
|
// An id consists of an optional root and a path. A root consists of either
|
|
// a scheme name followed by 2 or 3 slashes, or a single slash. Slashes in the
|
|
// root are not used as separators, so only normalize the path.
|
|
let [_, root, path] = id.match(/^(\w+:\/\/\/?|\/)?(.*)/);
|
|
|
|
let stack = [];
|
|
path.split("/").forEach(function (component) {
|
|
switch (component) {
|
|
case "":
|
|
case ".":
|
|
break;
|
|
case "..":
|
|
if (stack.length === 0) {
|
|
if (root !== undefined) {
|
|
throw new Error("Can't normalize absolute id '" + id + "'!");
|
|
} else {
|
|
stack.push("..");
|
|
}
|
|
} else {
|
|
if (stack[stack.length - 1] == "..") {
|
|
stack.push("..");
|
|
} else {
|
|
stack.pop();
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
stack.push(component);
|
|
break;
|
|
}
|
|
});
|
|
|
|
return (root ? root : "") + stack.join("/");
|
|
}
|
|
|
|
/**
|
|
* Create a module object with the given normalized id.
|
|
*
|
|
* @param String
|
|
* The normalized id of the module to be created.
|
|
*
|
|
* @return Object
|
|
* A module with the given id.
|
|
*/
|
|
function createModule(id) {
|
|
return Object.create(null, {
|
|
// CommonJS specifies the id property to be non-configurable and
|
|
// non-writable.
|
|
id: {
|
|
configurable: false,
|
|
enumerable: true,
|
|
value: id,
|
|
writable: false
|
|
},
|
|
|
|
// CommonJS does not specify an exports property, so follow the NodeJS
|
|
// convention, which is to make it non-configurable and writable.
|
|
exports: {
|
|
configurable: false,
|
|
enumerable: true,
|
|
value: Object.create(null),
|
|
writable: true
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Create a CommonJS loader with the following options:
|
|
* - createSandbox:
|
|
* A function that will be used to create sandboxes. It should take the name
|
|
* and prototype of the sandbox to be created, and return the newly created
|
|
* sandbox as result. This option is required.
|
|
* - globals:
|
|
* A map of names to built-in globals that will be exposed to every module.
|
|
* Defaults to the empty map.
|
|
* - loadSubScript:
|
|
* A function that will be used to load scripts in sandboxes. It should take
|
|
* the URL from and the sandbox in which the script is to be loaded, and not
|
|
* return a result. This option is required.
|
|
* - modules:
|
|
* A map from normalized ids to built-in modules that will be added to the
|
|
* module cache. Defaults to the empty map.
|
|
* - paths:
|
|
* A map of paths to base URLs that will be used to resolve relative URLs to
|
|
* absolute URLS. Defaults to the empty map.
|
|
* - resolve:
|
|
* A function that will be used to resolve relative ids to absolute ids. It
|
|
* should take the relative id of a module to be required and the absolute
|
|
* id of the requiring module as arguments, and return the absolute id of
|
|
* the module to be required as result. Defaults to resolveId above.
|
|
*/
|
|
function WorkerDebuggerLoader(options) {
|
|
/**
|
|
* Convert the given relative URL to an absolute URL, using the map of paths
|
|
* given below.
|
|
*
|
|
* @param String url
|
|
* The relative URL to be resolved.
|
|
*
|
|
* @return String
|
|
* An absolute URL.
|
|
*/
|
|
function resolveURL(url) {
|
|
let found = false;
|
|
for (let [path, baseURL] of paths) {
|
|
if (url.startsWith(path)) {
|
|
found = true;
|
|
url = url.replace(path, baseURL);
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
throw new Error("Can't resolve relative URL '" + url + "'!");
|
|
}
|
|
|
|
// If the url has no extension, use ".js" by default.
|
|
return url.endsWith(".js") ? url : url + ".js";
|
|
}
|
|
|
|
/**
|
|
* Load the given module with the given url.
|
|
*
|
|
* @param Object module
|
|
* The module object to be loaded.
|
|
* @param String url
|
|
* The URL to load the module from.
|
|
*/
|
|
function loadModule(module, url) {
|
|
// CommonJS specifies 3 free variables: require, exports, and module. These
|
|
// must be exposed to every module, so define these as properties on the
|
|
// sandbox prototype. Additional built-in globals are exposed by making
|
|
// the map of built-in globals the prototype of the sandbox prototype.
|
|
let prototype = Object.create(globals);
|
|
prototype.Components = {};
|
|
prototype.require = createRequire(module);
|
|
prototype.exports = module.exports;
|
|
prototype.module = module;
|
|
|
|
let sandbox = createSandbox(url, prototype);
|
|
try {
|
|
loadSubScript(url, sandbox);
|
|
} catch (error) {
|
|
if (/^Error opening input stream/.test(String(error))) {
|
|
throw new Error("Can't load module '" + module.id + "' with url '" +
|
|
url + "'!");
|
|
}
|
|
throw error;
|
|
}
|
|
|
|
// The value of exports may have been changed by the module script, so
|
|
// freeze it if and only if it is still an object.
|
|
if (typeof module.exports === "object" && module.exports !== null) {
|
|
Object.freeze(module.exports);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Create a require function for the given module. If no module is given,
|
|
* create a require function for the top-level module instead.
|
|
*
|
|
* @param Object requirer
|
|
* The module for which the require function is to be created.
|
|
*
|
|
* @return Function
|
|
* A require function for the given module.
|
|
*/
|
|
function createRequire(requirer) {
|
|
return function require(id) {
|
|
// Make sure an id was passed.
|
|
if (id === undefined) {
|
|
throw new Error("Can't require module without id!");
|
|
}
|
|
|
|
// Built-in modules are cached by id rather than URL, so try to find the
|
|
// module to be required by id first.
|
|
let module = modules[id];
|
|
if (module === undefined) {
|
|
// Failed to find the module to be required by id, so convert the id to
|
|
// a URL and try again.
|
|
|
|
// If the id is relative, convert it to an absolute id.
|
|
if (id.startsWith(".")) {
|
|
if (requirer === undefined) {
|
|
throw new Error("Can't require top-level module with relative id " +
|
|
"'" + id + "'!");
|
|
}
|
|
id = resolve(id, requirer.id);
|
|
}
|
|
|
|
// Convert the absolute id to a normalized id.
|
|
id = normalizeId(id);
|
|
|
|
// Convert the normalized id to a URL.
|
|
let url = id;
|
|
|
|
// If the URL is relative, resolve it to an absolute URL.
|
|
if (url.match(/^\w+:\/\//) === null) {
|
|
url = resolveURL(id);
|
|
}
|
|
|
|
// Try to find the module to be required by URL.
|
|
module = modules[url];
|
|
if (module === undefined) {
|
|
// Failed to find the module to be required in the cache, so create
|
|
// a new module, load it from the given URL, and add it to the cache.
|
|
|
|
// Add modules to the cache early so that any recursive calls to
|
|
// require for the same module will return the partially-loaded module
|
|
// from the cache instead of triggering a new load.
|
|
module = modules[url] = createModule(id);
|
|
|
|
try {
|
|
loadModule(module, url);
|
|
} catch (error) {
|
|
// If the module failed to load, remove it from the cache so that
|
|
// subsequent calls to require for the same module will trigger a
|
|
// new load, instead of returning a partially-loaded module from
|
|
// the cache.
|
|
delete modules[url];
|
|
throw error;
|
|
}
|
|
|
|
Object.freeze(module);
|
|
}
|
|
}
|
|
|
|
return module.exports;
|
|
};
|
|
}
|
|
|
|
let createSandbox = options.createSandbox;
|
|
let globals = options.globals || Object.create(null);
|
|
let loadSubScript = options.loadSubScript;
|
|
|
|
// Create the module cache, by converting each entry in the map from
|
|
// normalized ids to built-in modules to a module object, with the exports
|
|
// property of each module set to a frozen version of the original entry.
|
|
let modules = options.modules || {};
|
|
for (let id in modules) {
|
|
let module = createModule(id);
|
|
module.exports = Object.freeze(modules[id]);
|
|
modules[id] = module;
|
|
}
|
|
|
|
// Convert the map of paths to base URLs into an array for use by resolveURL.
|
|
// The array is sorted from longest to shortest path to ensure that the
|
|
// longest path is always the first to be found.
|
|
let paths = options.paths || Object.create(null);
|
|
paths = Object.keys(paths)
|
|
.sort((a, b) => b.length - a.length)
|
|
.map(path => [path, paths[path]]);
|
|
|
|
let resolve = options.resolve || resolveId;
|
|
|
|
this.require = createRequire();
|
|
}
|
|
|
|
this.WorkerDebuggerLoader = WorkerDebuggerLoader;
|
|
|
|
// The following APIs rely on the use of Components, and the worker debugger
|
|
// does not provide alternative definitions for them. Consequently, they are
|
|
// stubbed out both on the main thread and worker threads.
|
|
|
|
var PromiseDebugging = {
|
|
getState: function () {
|
|
throw new Error("PromiseDebugging is not available in workers!");
|
|
}
|
|
};
|
|
|
|
var chrome = {
|
|
CC: undefined,
|
|
Cc: undefined,
|
|
ChromeWorker: undefined,
|
|
Cm: undefined,
|
|
Ci: undefined,
|
|
Cu: undefined,
|
|
Cr: undefined,
|
|
components: undefined
|
|
};
|
|
|
|
var loader = {
|
|
lazyGetter: function (object, name, lambda) {
|
|
Object.defineProperty(object, name, {
|
|
get: function () {
|
|
delete object[name];
|
|
return object[name] = lambda.apply(object);
|
|
},
|
|
configurable: true,
|
|
enumerable: true
|
|
});
|
|
},
|
|
lazyImporter: function () {
|
|
throw new Error("Can't import JSM from worker thread!");
|
|
},
|
|
lazyServiceGetter: function () {
|
|
throw new Error("Can't import XPCOM service from worker thread!");
|
|
},
|
|
lazyRequireGetter: function (obj, property, module, destructure) {
|
|
Object.defineProperty(obj, property, {
|
|
get: () => destructure ? worker.require(module)[property]
|
|
: worker.require(module || property)
|
|
});
|
|
}
|
|
};
|
|
|
|
// The following APIs are defined differently depending on whether we are on the
|
|
// main thread or a worker thread. On the main thread, we use the Components
|
|
// object to implement them. On worker threads, we use the APIs provided by
|
|
// the worker debugger.
|
|
|
|
var {
|
|
Debugger,
|
|
createSandbox,
|
|
dump,
|
|
rpc,
|
|
loadSubScript,
|
|
reportError,
|
|
setImmediate,
|
|
xpcInspector
|
|
} = (function () {
|
|
if (typeof Components === "object") { // Main thread
|
|
let {
|
|
Constructor: CC,
|
|
classes: Cc,
|
|
manager: Cm,
|
|
interfaces: Ci,
|
|
results: Cr,
|
|
utils: Cu
|
|
} = Components;
|
|
|
|
let principal = CC('@mozilla.org/systemprincipal;1', 'nsIPrincipal')();
|
|
|
|
// To ensure that the this passed to addDebuggerToGlobal is a global, the
|
|
// Debugger object needs to be defined in a sandbox.
|
|
let sandbox = Cu.Sandbox(principal, {});
|
|
Cu.evalInSandbox(
|
|
"Components.utils.import('resource://gre/modules/jsdebugger.jsm');" +
|
|
"addDebuggerToGlobal(this);",
|
|
sandbox
|
|
);
|
|
let Debugger = sandbox.Debugger;
|
|
|
|
let createSandbox = function(name, prototype) {
|
|
return Cu.Sandbox(principal, {
|
|
invisibleToDebugger: true,
|
|
sandboxName: name,
|
|
sandboxPrototype: prototype,
|
|
wantComponents: false,
|
|
wantXrays: false
|
|
});
|
|
};
|
|
|
|
let rpc = undefined;
|
|
|
|
let subScriptLoader = Cc['@mozilla.org/moz/jssubscript-loader;1'].
|
|
getService(Ci.mozIJSSubScriptLoader);
|
|
|
|
let loadSubScript = function (url, sandbox) {
|
|
subScriptLoader.loadSubScript(url, sandbox, "UTF-8");
|
|
};
|
|
|
|
let reportError = Cu.reportError;
|
|
|
|
let Timer = Cu.import("resource://gre/modules/Timer.jsm", {});
|
|
|
|
let setImmediate = function (callback) {
|
|
Timer.setTimeout(callback, 0);
|
|
}
|
|
|
|
let xpcInspector = Cc["@mozilla.org/jsinspector;1"].
|
|
getService(Ci.nsIJSInspector);
|
|
|
|
return {
|
|
Debugger,
|
|
createSandbox,
|
|
dump: this.dump,
|
|
rpc,
|
|
loadSubScript,
|
|
reportError,
|
|
setImmediate,
|
|
xpcInspector
|
|
};
|
|
} else { // Worker thread
|
|
let requestors = [];
|
|
|
|
let scope = this;
|
|
|
|
let xpcInspector = {
|
|
get eventLoopNestLevel() {
|
|
return requestors.length;
|
|
},
|
|
|
|
get lastNestRequestor() {
|
|
return requestors.length === 0 ? null : requestors[requestors.length - 1];
|
|
},
|
|
|
|
enterNestedEventLoop: function (requestor) {
|
|
requestors.push(requestor);
|
|
scope.enterEventLoop();
|
|
return requestors.length;
|
|
},
|
|
|
|
exitNestedEventLoop: function () {
|
|
requestors.pop();
|
|
scope.leaveEventLoop();
|
|
return requestors.length;
|
|
}
|
|
};
|
|
|
|
return {
|
|
Debugger: this.Debugger,
|
|
createSandbox: this.createSandbox,
|
|
dump: this.dump,
|
|
rpc: this.rpc,
|
|
loadSubScript: this.loadSubScript,
|
|
reportError: this.reportError,
|
|
setImmediate: this.setImmediate,
|
|
xpcInspector: xpcInspector
|
|
};
|
|
}
|
|
}).call(this);
|
|
|
|
// Create the default instance of the worker loader, using the APIs we defined
|
|
// above.
|
|
|
|
this.worker = new WorkerDebuggerLoader({
|
|
createSandbox: createSandbox,
|
|
globals: {
|
|
"isWorker": true,
|
|
"dump": dump,
|
|
"loader": loader,
|
|
"reportError": reportError,
|
|
"rpc": rpc,
|
|
"setImmediate": setImmediate
|
|
},
|
|
loadSubScript: loadSubScript,
|
|
modules: {
|
|
"Debugger": Debugger,
|
|
"PromiseDebugging": PromiseDebugging,
|
|
"Services": Object.create(null),
|
|
"chrome": chrome,
|
|
"xpcInspector": xpcInspector
|
|
},
|
|
paths: {
|
|
// ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
|
|
"": "resource://gre/modules/commonjs/",
|
|
// ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
|
|
"devtools": "resource://devtools",
|
|
// ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
|
|
"promise": "resource://gre/modules/Promise-backend.js",
|
|
// ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
|
|
"source-map": "resource://devtools/shared/sourcemap/source-map.js",
|
|
// ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
|
|
"xpcshell-test": "resource://test"
|
|
// ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
|
|
}
|
|
});
|