Revert "Extract invoke-main stub generator."

pkg/compiler/lib/src/js_emitter/main_call_stub_generator.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of dart2js.js_emitter;
-
-class MainCallStubGenerator {
-  final Compiler compiler;
-  final JavaScriptBackend backend;
-  final CodeEmitterTask emitterTask;
-
-  MainCallStubGenerator(this.compiler, this.backend, this.emitterTask);
-
-  /// Returns the code equivalent to:
-  ///   `function(args) { $.startRootIsolate(X.main$closure(), args); }`
-  jsAst.Expression _buildIsolateSetupClosure(Element appMain,
-                                            Element isolateMain) {
-    jsAst.Expression mainAccess =
-        emitterTask.isolateStaticClosureAccess(appMain);
-    // Since we pass the closurized version of the main method to
-    // the isolate method, we must make sure that it exists.
-    return js('function(a){ #(#, a); }',
-        [emitterTask.staticFunctionAccess(isolateMain), mainAccess]);
-  }
-
-
-  jsAst.Statement generateInvokeMain() {
-    Element main = compiler.mainFunction;
-    jsAst.Expression mainCallClosure = null;
-    if (compiler.hasIsolateSupport) {
-      Element isolateMain =
-        backend.isolateHelperLibrary.find(JavaScriptBackend.START_ROOT_ISOLATE);
-      mainCallClosure = _buildIsolateSetupClosure(main, isolateMain);
-    } else if (compiler.hasIncrementalSupport) {
-      mainCallClosure = js(
-          'function() { return #(); }',
-          emitterTask.staticFunctionAccess(main));
-    } else {
-      mainCallClosure = emitterTask.staticFunctionAccess(main);
-    }
-
-    jsAst.Expression currentScriptAccess =
-        emitterTask.generateEmbeddedGlobalAccess(embeddedNames.CURRENT_SCRIPT);
-
-    // This code finds the currently executing script by listening to the
-    // onload event of all script tags and getting the first script which
-    // finishes. Since onload is called immediately after execution this should
-    // not substantially change execution order.
-    return js.statement('''
-      (function (callback) {
-        if (typeof document === "undefined") {
-          callback(null);
-          return;
-        }
-        if (document.currentScript) {
-          callback(document.currentScript);
-          return;
-        }
-
-        var scripts = document.scripts;
-        function onLoad(event) {
-          for (var i = 0; i < scripts.length; ++i) {
-            scripts[i].removeEventListener("load", onLoad, false);
-          }
-          callback(event.target);
-        }
-        for (var i = 0; i < scripts.length; ++i) {
-          scripts[i].addEventListener("load", onLoad, false);
-        }
-      })(function(currentScript) {
-        #currentScript = currentScript;
-
-        if (typeof dartMainRunner === "function") {
-          dartMainRunner(#mainCallClosure, []);
-        } else {
-          #mainCallClosure([]);
-        }
-      })''',
-      {'currentScript': currentScriptAccess,
-       'mainCallClosure': mainCallClosure});
-  }
-}