Split NativeData

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

 // Copyright (c) 2012, 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.
 
 library dart2js.js_emitter.native_emitter;
 
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../elements/types.dart' show DartType, FunctionType;
 import '../elements/entities.dart';
 import '../js/js.dart' as jsAst;
 import '../js/js.dart' show js;
 import '../js_backend/backend_helpers.dart' show BackendHelpers;
-import '../js_backend/js_backend.dart' show JavaScriptBackend;
+import '../js_backend/js_backend.dart' show JavaScriptBackend, Namer;
+import '../js_backend/interceptor_data.dart';
+import '../js_backend/native_data.dart';
 import '../universe/world_builder.dart' show CodegenWorldBuilder;
 
 import 'code_emitter_task.dart' show CodeEmitterTask;
 import 'model.dart';
 
 class NativeEmitter {
   final CodeEmitterTask emitterTask;
 
   // Whether the application contains native classes.
   bool hasNativeClasses = false;
@@ skipping 12 matching lines @@
   NativeEmitter(CodeEmitterTask emitterTask) : this.emitterTask = emitterTask;
 
   Compiler get compiler => emitterTask.compiler;
 
   JavaScriptBackend get backend => compiler.backend;
 
   BackendHelpers get helpers => backend.helpers;
 
   CodegenWorldBuilder get worldBuilder => compiler.codegenWorldBuilder;
 
+  NativeData get nativeData => backend.nativeData;
+
+  InterceptorData get interceptorData => backend.interceptorData;
+
+  Namer get namer => backend.namer;
+
   /**
    * Prepares native classes for emission. Returns the unneeded classes.
    *
    * Removes trivial classes (that can be represented by a super type) and
    * generates properties that have to be added to classes (native or not).
    *
    * Updates the `nativeLeafTags`, `nativeNonLeafTags` and `nativeExtensions`
    * fields of the given classes. This data must be emitted with the
    * corresponding classes.
    *
@@ skipping 77 matching lines @@
         needed = true;
       } else if (interceptorClassesNeededByConstants.contains(classElement)) {
         needed = true;
       } else if (classesModifiedByEmitRTISupport.contains(classElement)) {
         // TODO(9556): Remove this test when [emitRuntimeTypeSupport] no longer
         // adds information to a class prototype or constructor.
         needed = true;
       } else if (extensionPoints.containsKey(cls)) {
         needed = true;
       }
-      if (backend.isJsInteropClass(classElement)) {
+      if (nativeData.isJsInteropClass(classElement)) {
         needed = true; // TODO(jacobr): we don't need all interop classes.
       } else if (cls.isNative &&
-          backend.nativeData.hasNativeTagsForcedNonLeaf(classElement)) {
+          nativeData.hasNativeTagsForcedNonLeaf(classElement)) {
         needed = true;
         nonLeafClasses.add(cls);
       }
 
       if (needed || neededClasses.contains(cls)) {
         neededClasses.add(cls);
         neededClasses.add(cls.superclass);
         nonLeafClasses.add(cls.superclass);
       }
     }
 
     // Collect all the tags that map to each native class.
 
     Map<Class, Set<String>> leafTags = new Map<Class, Set<String>>();
     Map<Class, Set<String>> nonleafTags = new Map<Class, Set<String>>();
 
     for (Class cls in classes) {
       if (!cls.isNative) continue;
       ClassEntity element = cls.element;
-      if (backend.isJsInteropClass(element)) continue;
-      List<String> nativeTags =
-          backend.nativeData.getNativeTagsOfClass(cls.element);
+      if (nativeData.isJsInteropClass(element)) continue;
+      List<String> nativeTags = nativeData.getNativeTagsOfClass(cls.element);
 
       if (nonLeafClasses.contains(cls) || extensionPoints.containsKey(cls)) {
         nonleafTags
             .putIfAbsent(cls, () => new Set<String>())
             .addAll(nativeTags);
       } else {
         Class sufficingInterceptor = cls;
         while (!neededClasses.contains(sufficingInterceptor)) {
           sufficingInterceptor = sufficingInterceptor.superclass;
         }
@@ skipping 126 matching lines @@
     List<jsAst.Statement> statements = <jsAst.Statement>[];
     potentiallyConvertDartClosuresToJs(statements, member, stubParameters);
 
     String target;
     jsAst.Expression receiver;
     List<jsAst.Expression> arguments;
 
     assert(invariant(member, nativeMethods.contains(member)));
     // When calling a JS method, we call it with the native name, and only the
     // arguments up until the last one provided.
-    target = backend.nativeData.getFixedBackendName(member);
+    target = nativeData.getFixedBackendName(member);
 
     if (isInterceptedMethod) {
       receiver = argumentsBuffer[0];
       arguments = argumentsBuffer.sublist(
           1, indexOfLastOptionalArgumentInParameters + 1);
     } else {
       // Native methods that are not intercepted must be static.
       assert(invariant(member, member.isStatic));
       arguments = argumentsBuffer.sublist(
           0, indexOfLastOptionalArgumentInParameters + 1);
-      if (backend.isJsInteropMethod(member)) {
+      if (nativeData.isJsInteropMethod(member)) {
         // fixedBackendPath is allowed to have the form foo.bar.baz for
         // interop. This template is uncached to avoid possibly running out of
         // memory when Dart2Js is run in server mode. In reality the risk of
         // caching these templates causing an issue  is very low as each class
         // and library that uses typed JavaScript interop will create only 1
         // unique template.
         receiver = js
-            .uncachedExpressionTemplate(
-                backend.namer.fixedBackendMethodPath(member))
+            .uncachedExpressionTemplate(namer.fixedBackendMethodPath(member))
             .instantiate([]);
       } else {
         receiver = js('this');
       }
     }
     statements
         .add(js.statement('return #.#(#)', [receiver, target, arguments]));
 
     return statements;
   }
 
   bool isSupertypeOfNativeClass(ClassEntity element) {
-    if (backend.interceptorData.isMixedIntoInterceptedClass(element)) {
+    if (interceptorData.isMixedIntoInterceptedClass(element)) {
       return true;
     }
 
     return subtypes[element] != null;
   }
 
   bool requiresNativeIsCheck(ClassEntity element) {
     // TODO(sra): Remove this function.  It determines if a native type may
     // satisfy a check against [element], in which case an interceptor must be
     // used.  We should also use an interceptor if the check can't be satisfied
     // by a native class in case we get a native instance that tries to spoof
     // the type info.  i.e the criteria for whether or not to use an interceptor
     // is whether the receiver can be native, not the type of the test.
     ClassEntity cls = element;
-    if (backend.nativeData.isNativeOrExtendsNative(cls)) return true;
+    if (nativeData.isNativeOrExtendsNative(cls)) return true;
     return isSupertypeOfNativeClass(element);
   }
 }