fix(perf): don’t use `try/catch` in production mode

The previous code that had `try/catch` statements in methods could not be optimized by Chrome. 

This change separates `AppView` (no `try/catch`) form `DebugAppView` (always `try/catch`). Our codegen will use `AppView` in production mode and `DebugAppView` in debug mode.

Closes #8338

modules/angular2/src/compiler/identifiers.ts

@@ -1,5 +1,5 @@
 import {CompileIdentifierMetadata, CompileTokenMetadata} from './compile_metadata';
-import {AppView} from 'angular2/src/core/linker/view';
+import {AppView, DebugAppView} from 'angular2/src/core/linker/view';
 import {StaticNodeDebugInfo, DebugContext} from 'angular2/src/core/linker/debug_context';
 import {
   ViewUtils,
@@ -47,6 +47,7 @@ var CD_MODULE_URL = 'asset:angular2/lib/src/core/change_detection/change_detecti
 // (only needed for Dart).
 var impViewUtils = ViewUtils;
 var impAppView = AppView;
+var impDebugAppView = DebugAppView;
 var impDebugContext = DebugContext;
 var impAppElement = AppElement;
 var impElementRef = ElementRef;
@@ -80,6 +81,8 @@ export class Identifiers {
   });
   static AppView = new CompileIdentifierMetadata(
       {name: 'AppView', moduleUrl: APP_VIEW_MODULE_URL, runtime: impAppView});
+  static DebugAppView = new CompileIdentifierMetadata(
+      {name: 'DebugAppView', moduleUrl: APP_VIEW_MODULE_URL, runtime: impDebugAppView});
   static AppElement = new CompileIdentifierMetadata({
     name: 'AppElement',
     moduleUrl: 'asset:angular2/lib/src/core/linker/element' + MODULE_SUFFIX,

modules/angular2/src/compiler/output/interpretive_view.ts

@@ -1,5 +1,5 @@
 import {isPresent} from 'angular2/src/facade/lang';
-import {AppView} from 'angular2/src/core/linker/view';
+import {AppView, DebugAppView} from 'angular2/src/core/linker/view';
 import {AppElement} from 'angular2/src/core/linker/element';
 import {BaseException} from 'angular2/src/facade/exceptions';
 import {InstanceFactory, DynamicInstance} from './output_interpreter';
@@ -8,13 +8,19 @@ export class InterpretiveAppViewInstanceFactory implements InstanceFactory {
   createInstance(superClass: any, clazz: any, args: any[], props: Map<string, any>,
                  getters: Map<string, Function>, methods: Map<string, Function>): any {
     if (superClass === AppView) {
+      // We are always using DebugAppView as parent.
+      // However, in prod mode we generate a constructor call that does
+      // not have the argument for the debugNodeInfos.
+      args = args.concat([null]);
+      return new _InterpretiveAppView(args, props, getters, methods);
+    } else if (superClass === DebugAppView) {
       return new _InterpretiveAppView(args, props, getters, methods);
     }
     throw new BaseException(`Can't instantiate class ${superClass} in interpretative mode`);
   }
 }
 
-class _InterpretiveAppView extends AppView<any> implements DynamicInstance {
+class _InterpretiveAppView extends DebugAppView<any> implements DynamicInstance {
   constructor(args: any[], public props: Map<string, any>, public getters: Map<string, Function>,
               public methods: Map<string, Function>) {
     super(args[0], args[1], args[2], args[3], args[4], args[5], args[6], args[7]);

modules/angular2/src/compiler/view_compiler/view_builder.ts

@@ -398,19 +398,20 @@ function createViewClass(view: CompileView, renderCompTypeVar: o.ReadVarExpr,
     new o.FnParam(ViewConstructorVars.parentInjector.name, o.importType(Identifiers.Injector)),
     new o.FnParam(ViewConstructorVars.declarationEl.name, o.importType(Identifiers.AppElement))
   ];
-  var viewConstructor = new o.ClassMethod(null, viewConstructorArgs, [
-    o.SUPER_EXPR.callFn([
-                  o.variable(view.className),
-                  renderCompTypeVar,
-                  ViewTypeEnum.fromValue(view.viewType),
-                  ViewConstructorVars.viewUtils,
-                  ViewConstructorVars.parentInjector,
-                  ViewConstructorVars.declarationEl,
-                  ChangeDetectionStrategyEnum.fromValue(getChangeDetectionMode(view)),
-                  nodeDebugInfosVar
-                ])
-        .toStmt()
-  ]);
+  var superConstructorArgs = [
+    o.variable(view.className),
+    renderCompTypeVar,
+    ViewTypeEnum.fromValue(view.viewType),
+    ViewConstructorVars.viewUtils,
+    ViewConstructorVars.parentInjector,
+    ViewConstructorVars.declarationEl,
+    ChangeDetectionStrategyEnum.fromValue(getChangeDetectionMode(view))
+  ];
+  if (view.genConfig.genDebugInfo) {
+    superConstructorArgs.push(nodeDebugInfosVar);
+  }
+  var viewConstructor = new o.ClassMethod(null, viewConstructorArgs,
+                                          [o.SUPER_EXPR.callFn(superConstructorArgs).toStmt()]);
 
   var viewMethods = [
     new o.ClassMethod('createInternal', [new o.FnParam(rootSelectorVar.name, o.STRING_TYPE)],
@@ -431,9 +432,10 @@ function createViewClass(view: CompileView, renderCompTypeVar: o.ReadVarExpr,
     new o.ClassMethod('dirtyParentQueriesInternal', [], view.dirtyParentQueriesMethod.finish()),
     new o.ClassMethod('destroyInternal', [], view.destroyMethod.finish())
   ].concat(view.eventHandlerMethods);
-  var viewClass = new o.ClassStmt(
-      view.className, o.importExpr(Identifiers.AppView, [getContextType(view)]), view.fields,
-      view.getters, viewConstructor, viewMethods.filter((method) => method.body.length > 0));
+  var superClass = view.genConfig.genDebugInfo ? Identifiers.DebugAppView : Identifiers.AppView;
+  var viewClass = new o.ClassStmt(view.className, o.importExpr(superClass, [getContextType(view)]),
+                                  view.fields, view.getters, viewConstructor,
+                                  viewMethods.filter((method) => method.body.length > 0));
   return viewClass;
 }
 

modules/angular2/src/core/linker/debug_context.ts

@@ -2,7 +2,7 @@ import {isPresent, isBlank, CONST} from 'angular2/src/facade/lang';
 import {ListWrapper, StringMapWrapper} from 'angular2/src/facade/collection';
 import {Injector} from 'angular2/src/core/di';
 import {RenderDebugInfo} from 'angular2/src/core/render/api';
-import {AppView} from './view';
+import {DebugAppView} from './view';
 import {ViewType} from './view_type';
 
 @CONST()
@@ -12,7 +12,7 @@ export class StaticNodeDebugInfo {
 }
 
 export class DebugContext implements RenderDebugInfo {
-  constructor(private _view: AppView<any>, private _nodeIndex: number, private _tplRow: number,
+  constructor(private _view: DebugAppView<any>, private _nodeIndex: number, private _tplRow: number,
               private _tplCol: number) {}
 
   private get _staticNodeInfo(): StaticNodeDebugInfo {
@@ -31,7 +31,7 @@ export class DebugContext implements RenderDebugInfo {
     var componentView = this._view;
     while (isPresent(componentView.declarationAppElement) &&
            componentView.type !== ViewType.COMPONENT) {
-      componentView = componentView.declarationAppElement.parentView;
+      componentView = <DebugAppView<any>>componentView.declarationAppElement.parentView;
     }
     return isPresent(componentView.declarationAppElement) ?
                componentView.declarationAppElement.nativeElement :

modules/angular2/src/core/linker/view.ts

@@ -24,7 +24,12 @@ import {
 } from 'angular2/src/facade/lang';
 
 import {ObservableWrapper} from 'angular2/src/facade/async';
-import {Renderer, RootRenderer, RenderComponentType} from 'angular2/src/core/render/api';
+import {
+  Renderer,
+  RootRenderer,
+  RenderComponentType,
+  RenderDebugInfo
+} from 'angular2/src/core/render/api';
 import {ViewRef_} from './view_ref';
 
 import {ViewType} from './view_type';
@@ -78,16 +83,13 @@ export abstract class AppView<T> {
 
   renderer: Renderer;
 
-  private _currentDebugContext: DebugContext = null;
-
   private _hasExternalHostElement: boolean;
 
   public context: T;
 
   constructor(public clazz: any, public componentType: RenderComponentType, public type: ViewType,
               public viewUtils: ViewUtils, public parentInjector: Injector,
-              public declarationAppElement: AppElement, public cdMode: ChangeDetectionStrategy,
-              public staticNodeDebugInfos: StaticNodeDebugInfo[]) {
+              public declarationAppElement: AppElement, public cdMode: ChangeDetectionStrategy) {
     this.ref = new ViewRef_(this);
     if (type === ViewType.COMPONENT || type === ViewType.HOST) {
       this.renderer = viewUtils.renderComponent(componentType);
@@ -115,17 +117,7 @@ export abstract class AppView<T> {
     }
     this._hasExternalHostElement = isPresent(rootSelectorOrNode);
     this.projectableNodes = projectableNodes;
-    if (this.debugMode) {
-      this._resetDebug();
-      try {
-        return this.createInternal(rootSelectorOrNode);
-      } catch (e) {
-        this._rethrowWithContext(e, e.stack);
-        throw e;
-      }
-    } else {
-      return this.createInternal(rootSelectorOrNode);
-    }
+    return this.createInternal(rootSelectorOrNode);
   }
 
   /**
@@ -150,28 +142,18 @@ export abstract class AppView<T> {
   }
 
   selectOrCreateHostElement(elementName: string, rootSelectorOrNode: string | any,
-                            debugCtx: DebugContext): any {
+                            debugInfo: RenderDebugInfo): any {
     var hostElement;
     if (isPresent(rootSelectorOrNode)) {
-      hostElement = this.renderer.selectRootElement(rootSelectorOrNode, debugCtx);
+      hostElement = this.renderer.selectRootElement(rootSelectorOrNode, debugInfo);
     } else {
-      hostElement = this.renderer.createElement(null, elementName, debugCtx);
+      hostElement = this.renderer.createElement(null, elementName, debugInfo);
     }
     return hostElement;
   }
 
   injectorGet(token: any, nodeIndex: number, notFoundResult: any): any {
-    if (this.debugMode) {
-      this._resetDebug();
-      try {
-        return this.injectorGetInternal(token, nodeIndex, notFoundResult);
-      } catch (e) {
-        this._rethrowWithContext(e, e.stack);
-        throw e;
-      }
-    } else {
-      return this.injectorGetInternal(token, nodeIndex, notFoundResult);
-    }
+    return this.injectorGetInternal(token, nodeIndex, notFoundResult);
   }
 
   /**
@@ -210,22 +192,12 @@ export abstract class AppView<T> {
     for (var i = 0; i < children.length; i++) {
       children[i]._destroyRecurse();
     }
-    if (this.debugMode) {
-      this._resetDebug();
-      try {
-        this._destroyLocal();
-      } catch (e) {
-        this._rethrowWithContext(e, e.stack);
-        throw e;
-      }
-    } else {
-      this._destroyLocal();
-    }
+    this.destroyLocal();
 
     this.destroyed = true;
   }
 
-  private _destroyLocal() {
+  destroyLocal() {
     var hostElement =
         this.type === ViewType.COMPONENT ? this.declarationAppElement.nativeElement : null;
     for (var i = 0; i < this.disposables.length; i++) {
@@ -250,8 +222,6 @@ export abstract class AppView<T> {
    */
   destroyInternal(): void {}
 
-  get debugMode(): boolean { return isPresent(this.staticNodeDebugInfos); }
-
   get changeDetectorRef(): ChangeDetectorRef { return this.ref; }
 
   get parent(): AppView<any> {
@@ -293,17 +263,7 @@ export abstract class AppView<T> {
     if (this.destroyed) {
       this.throwDestroyedError('detectChanges');
     }
-    if (this.debugMode) {
-      this._resetDebug();
-      try {
-        this.detectChangesInternal(throwOnChange);
-      } catch (e) {
-        this._rethrowWithContext(e, e.stack);
-        throw e;
-      }
-    } else {
-      this.detectChangesInternal(throwOnChange);
-    }
+    this.detectChangesInternal(throwOnChange);
     if (this.cdMode === ChangeDetectionStrategy.CheckOnce)
       this.cdMode = ChangeDetectionStrategy.Checked;
 
@@ -355,6 +315,61 @@ export abstract class AppView<T> {
     }
   }
 
+  eventHandler(cb: Function): Function { return cb; }
+
+  throwDestroyedError(details: string): void { throw new ViewDestroyedException(details); }
+}
+
+export class DebugAppView<T> extends AppView<T> {
+  private _currentDebugContext: DebugContext = null;
+
+  constructor(clazz: any, componentType: RenderComponentType, type: ViewType, viewUtils: ViewUtils,
+              parentInjector: Injector, declarationAppElement: AppElement,
+              cdMode: ChangeDetectionStrategy, public staticNodeDebugInfos: StaticNodeDebugInfo[]) {
+    super(clazz, componentType, type, viewUtils, parentInjector, declarationAppElement, cdMode);
+  }
+
+  create(context: T, givenProjectableNodes: Array<any | any[]>,
+         rootSelectorOrNode: string | any): AppElement {
+    this._resetDebug();
+    try {
+      return super.create(context, givenProjectableNodes, rootSelectorOrNode);
+    } catch (e) {
+      this._rethrowWithContext(e, e.stack);
+      throw e;
+    }
+  }
+
+  injectorGet(token: any, nodeIndex: number, notFoundResult: any): any {
+    this._resetDebug();
+    try {
+      return super.injectorGet(token, nodeIndex, notFoundResult);
+    } catch (e) {
+      this._rethrowWithContext(e, e.stack);
+      throw e;
+    }
+  }
+
+  destroyLocal() {
+    this._resetDebug();
+    try {
+      super.destroyLocal();
+    } catch (e) {
+      this._rethrowWithContext(e, e.stack);
+      throw e;
+    }
+  }
+
+  detectChanges(throwOnChange: boolean): void {
+    this._resetDebug();
+    try {
+      super.detectChanges(throwOnChange);
+    } catch (e) {
+      this._rethrowWithContext(e, e.stack);
+      throw e;
+    }
+  }
+
   private _resetDebug() { this._currentDebugContext = null; }
 
   debug(nodeIndex: number, rowNum: number, colNum: number): DebugContext {
@@ -373,22 +388,17 @@ export abstract class AppView<T> {
   }
 
   eventHandler(cb: Function): Function {
-    if (this.debugMode) {
-      return (event) => {
-        this._resetDebug();
-        try {
-          return cb(event);
-        } catch (e) {
-          this._rethrowWithContext(e, e.stack);
-          throw e;
-        }
-      };
-    } else {
-      return cb;
-    }
+    var superHandler = super.eventHandler(cb);
+    return (event) => {
+      this._resetDebug();
+      try {
+        return superHandler(event);
+      } catch (e) {
+        this._rethrowWithContext(e, e.stack);
+        throw e;
+      }
+    };
   }
-
-  throwDestroyedError(details: string): void { throw new ViewDestroyedException(details); }
 }
 
 function _findLastRenderNode(node: any): any {