michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: "use strict";
michael@0: 
michael@0: const Cu = Components.utils;
michael@0: const Ci = Components.interfaces;
michael@0: 
michael@0: Cu.import("resource://gre/modules/XPCOMUtils.jsm");
michael@0: Cu.import("resource://gre/modules/Services.jsm");
michael@0: Cu.import("resource://gre/modules/Promise.jsm");
michael@0: 
michael@0: this.EXPORTED_SYMBOLS = ["ScriptPreloader"];
michael@0: 
michael@0: function debug(aMsg) {
michael@0:   //dump("--*-- ScriptPreloader: " + aMsg + "\n");
michael@0: }
michael@0: 
michael@0: this.ScriptPreloader = {
michael@0: #ifdef MOZ_B2G
michael@0:   _enabled: true,
michael@0: #else
michael@0:   _enabled: false,
michael@0: #endif
michael@0: 
michael@0:   preload: function(aApp, aManifest) {
michael@0:     debug("Preloading " + aApp.origin);
michael@0:     let deferred = Promise.defer();
michael@0: 
michael@0:     if (!this._enabled) {
michael@0:       deferred.resolve();
michael@0:       return deferred.promise;
michael@0:     }
michael@0: 
michael@0:     if (aManifest.precompile &&
michael@0:         Array.isArray(aManifest.precompile) &&
michael@0:         aManifest.precompile.length > 0) {
michael@0:       let origin = Services.io.newURI(aApp.origin, null, null);
michael@0:       let toLoad = aManifest.precompile.length;
michael@0:       let principal =
michael@0:         Services.scriptSecurityManager
michael@0:                 .getAppCodebasePrincipal(origin, aApp.localId, false);
michael@0: 
michael@0:       aManifest.precompile.forEach((aPath) => {
michael@0:         let uri = Services.io.newURI(aPath, null, origin);
michael@0:         debug("Script to compile: " + uri.spec);
michael@0:         try {
michael@0:           Services.scriptloader.precompileScript(uri, principal,
michael@0:             (aSubject, aTopic, aData) => {
michael@0:               let uri = aSubject.QueryInterface(Ci.nsIURI);
michael@0:               debug("Done compiling " + uri.spec);
michael@0: 
michael@0:               toLoad--;
michael@0:               if (toLoad == 0) {
michael@0:                 deferred.resolve();
michael@0:               }
michael@0:             });
michael@0:         } catch (e) {
michael@0:           // Resolve the promise if precompileScript throws.
michael@0:           deferred.resolve();
michael@0:         }
michael@0:       });
michael@0:     } else {
michael@0:       // The precompile field is not an array, let the developer know.
michael@0:       // We don't want to have to enable debug for that to show up.
michael@0:       if (aManifest.precompile) {
michael@0:         Cu.reportError("ASM.JS compilation failed: the 'precompile' manifest " +
michael@0:                        "property should be an array of script uris.\n");
michael@0:       }
michael@0:       deferred.resolve();
michael@0:     }
michael@0: 
michael@0:     return deferred.promise;
michael@0:   }
michael@0: }