Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 536 insertions, 0 deletions

diff --git a/devtools/shared/loader/worker-loader.js b/devtools/shared/loader/worker-loader.js
new file mode 100644
index 0000000000..4d8ff61bc7
--- /dev/null
+++ b/devtools/shared/loader/worker-loader.js
@@ -0,0 +1,536 @@
+/* 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";
+
+/* global worker, DebuggerNotificationObserver */
+
+// 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.
+//
+// Note: to see dump output when running inside the worker thread, you might
+// need to enable the browser.dom.window.dump.enabled pref.
+
+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.
+  const [, root, path] = id.match(/^(\w+:\/\/\/?|\/)?(.*)/);
+
+  const 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 (const [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.
+    // Also allow loading JSMs, but they would need a shim in order to
+    // be loaded as a CommonJS module. (See SessionDataHelpers.jsm)
+    return url.endsWith(".js") || url.endsWith(".jsm") ? 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.
+    const prototype = Object.create(globals);
+    prototype.Components = {};
+    prototype.require = createRequire(module);
+    prototype.exports = module.exports;
+    prototype.module = module;
+
+    const 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;
+    };
+  }
+
+  const createSandbox = options.createSandbox;
+  const globals = options.globals || Object.create(null);
+  const 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.
+  const modules = options.modules || {};
+  for (const id in modules) {
+    const 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]]);
+
+  const resolve = options.resolve || resolveId;
+
+  this.require = createRequire();
+}
+
+this.WorkerDebuggerLoader = WorkerDebuggerLoader;
+
+var loader = {
+  lazyGetter(object, name, lambda) {
+    Object.defineProperty(object, name, {
+      get() {
+        delete object[name];
+        object[name] = lambda.apply(object);
+        return object[name];
+      },
+      configurable: true,
+      enumerable: true,
+    });
+  },
+  lazyServiceGetter() {
+    throw new Error("Can't import XPCOM service from worker thread!");
+  },
+  lazyRequireGetter(obj, properties, module, destructure) {
+    if (Array.isArray(properties) && !destructure) {
+      throw new Error(
+        "Pass destructure=true to call lazyRequireGetter with an array of properties"
+      );
+    }
+
+    if (!Array.isArray(properties)) {
+      properties = [properties];
+    }
+
+    for (const property of properties) {
+      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.
+
+/* eslint-disable no-shadow */
+var {
+  Debugger,
+  URL,
+  createSandbox,
+  dump,
+  rpc,
+  loadSubScript,
+  setImmediate,
+  xpcInspector,
+} = function () {
+  // Main thread
+  if (typeof Components === "object") {
+    const principal = Components.Constructor(
+      "@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.
+    const sandbox = Cu.Sandbox(principal, {
+      wantGlobalProperties: ["ChromeUtils"],
+    });
+    Cu.evalInSandbox(
+      `
+const { addDebuggerToGlobal } = ChromeUtils.importESModule(
+  'resource://gre/modules/jsdebugger.sys.mjs'
+);
+addDebuggerToGlobal(globalThis);
+`,
+      sandbox
+    );
+    const Debugger = sandbox.Debugger;
+
+    const createSandbox = function (name, prototype) {
+      return Cu.Sandbox(principal, {
+        invisibleToDebugger: true,
+        sandboxName: name,
+        sandboxPrototype: prototype,
+        wantComponents: false,
+        wantXrays: false,
+      });
+    };
+
+    const rpc = undefined;
+
+    // eslint-disable-next-line mozilla/use-services
+    const subScriptLoader = Cc[
+      "@mozilla.org/moz/jssubscript-loader;1"
+    ].getService(Ci.mozIJSSubScriptLoader);
+
+    const loadSubScript = function (url, sandbox) {
+      subScriptLoader.loadSubScript(url, sandbox);
+    };
+
+    const Timer = ChromeUtils.importESModule(
+      "resource://gre/modules/Timer.sys.mjs"
+    );
+
+    const setImmediate = function (callback) {
+      Timer.setTimeout(callback, 0);
+    };
+
+    const xpcInspector = Cc["@mozilla.org/jsinspector;1"].getService(
+      Ci.nsIJSInspector
+    );
+
+    const { URL } = Cu.Sandbox(principal, {
+      wantGlobalProperties: ["URL"],
+    });
+
+    return {
+      Debugger,
+      URL,
+      createSandbox,
+      dump: this.dump,
+      rpc,
+      loadSubScript,
+      setImmediate,
+      xpcInspector,
+    };
+  }
+  // Worker thread
+  const requestors = [];
+
+  const scope = this;
+
+  const xpcInspector = {
+    get eventLoopNestLevel() {
+      return requestors.length;
+    },
+
+    get lastNestRequestor() {
+      return requestors.length === 0 ? null : requestors[requestors.length - 1];
+    },
+
+    enterNestedEventLoop(requestor) {
+      requestors.push(requestor);
+      scope.enterEventLoop();
+      return requestors.length;
+    },
+
+    exitNestedEventLoop() {
+      requestors.pop();
+      scope.leaveEventLoop();
+      return requestors.length;
+    },
+  };
+
+  return {
+    Debugger: this.Debugger,
+    URL: this.URL,
+    createSandbox: this.createSandbox,
+    dump: this.dump,
+    rpc: this.rpc,
+    loadSubScript: this.loadSubScript,
+    setImmediate: this.setImmediate,
+    xpcInspector,
+  };
+}.call(this);
+/* eslint-enable no-shadow */
+
+// Create the default instance of the worker loader, using the APIs we defined
+// above.
+
+this.worker = new WorkerDebuggerLoader({
+  createSandbox,
+  globals: {
+    isWorker: true,
+    dump,
+    loader,
+    rpc,
+    URL,
+    setImmediate,
+    retrieveConsoleEvents: this.retrieveConsoleEvents,
+    setConsoleEventHandler: this.setConsoleEventHandler,
+    clearConsoleEvents: this.clearConsoleEvents,
+    console,
+    btoa: this.btoa,
+    atob: this.atob,
+    Services: Object.create(null),
+    ChromeUtils,
+    DebuggerNotificationObserver,
+
+    // 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.
+    Cc: undefined,
+    ChromeWorker: undefined,
+    Ci: undefined,
+    Cu: undefined,
+    Cr: undefined,
+    Components: undefined,
+  },
+  loadSubScript,
+  modules: {
+    Debugger,
+    xpcInspector,
+  },
+  paths: {
+    // ⚠ 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 ⚠
+    "xpcshell-test": "resource://test",
+    // ⚠ DISCUSSION ON DEV-DEVELOPER-TOOLS REQUIRED BEFORE MODIFYING ⚠
+  },
+});