Compile and run Hello World!

pkg/compiler/lib/src/kernel/element_map.dart

 // Copyright (c) 2017, 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.
 
+import 'package:js_runtime/shared/embedded_names.dart';
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../common/names.dart';
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../common_elements.dart';
 import '../elements/entities.dart';
 import '../elements/jumps.dart';
 import '../elements/names.dart';
 import '../elements/operators.dart';
 import '../elements/types.dart';
+import '../js/js.dart' as js;
 import '../js_backend/backend.dart' show JavaScriptBackend;
+import '../js_backend/namer.dart';
+import '../js_emitter/code_emitter_task.dart';
 import '../native/native.dart' as native;
 import '../types/types.dart';
 import '../universe/call_structure.dart';
 import '../universe/selector.dart';
 import '../world.dart';
 import 'kernel_debug.dart';
 
 /// Interface that translates between Kernel IR nodes and entities.
 abstract class KernelToElementMap {
   /// Access to the commonly used elements and types.
@@ skipping 109 matching lines @@
       ir.StaticInvocation node);
 
   /// Computes the [native.NativeBehavior] for a call to the
   /// [JS_EMBEDDED_GLOBAL] function.
   native.NativeBehavior getNativeBehaviorForJsEmbeddedGlobalCall(
       ir.StaticInvocation node);
 
   /// Compute the kind of foreign helper function called by [node], if any.
   ForeignKind getForeignKind(ir.StaticInvocation node);
 
+  /// Returns the [js.Name] for the `JsGetName` [constant] value.
+  js.Name getNameForJsGetName(ConstantValue constant, Namer namer);
+
+  /// Returns the [js.Template] for the `JsBuiltin` [constant] value.
+  js.Template getJsBuiltinTemplate(
+      ConstantValue constant, CodeEmitterTask emitter);
+
   /// Computes the [InterfaceType] referenced by a call to the
   /// [JS_INTERCEPTOR_CONSTANT] function, if any.
   InterfaceType getInterfaceTypeForJsInterceptorCall(ir.StaticInvocation node);
 
   /// Computes the [ConstantValue] for the constant [expression].
   ConstantValue getConstantValue(ir.Expression expression,
       {bool requireConstant: true, bool implicitNull: false});
 
   /// Return the [ConstantValue] the initial value of [field] or `null` if
   /// the initializer is not a constant expression.
@@ skipping 368 matching lines @@
         // `Object.superNoSuchMethod`.
         break;
       }
     }
     FunctionEntity function = elementEnvironment.lookupClassMember(
         commonElements.objectClass, Identifiers.noSuchMethod_);
     assert(function != null,
         failedAt(cls, "No super noSuchMethod found for class $cls."));
     return function;
   }
+
+  js.Name getNameForJsGetName(ConstantValue constant, Namer namer) {
+    int index = _extractEnumIndexFromConstantValue(
+        constant, commonElements.jsGetNameEnum);
+    if (index == null) return null;
+    return namer.getNameForJsGetName(
+        CURRENT_ELEMENT_SPANNABLE, JsGetName.values[index]);
+  }
+
+  js.Template getJsBuiltinTemplate(
+      ConstantValue constant, CodeEmitterTask emitter) {
+    int index = _extractEnumIndexFromConstantValue(
+        constant, commonElements.jsBuiltinEnum);
+    if (index == null) return null;
+    return emitter.builtinTemplateFor(JsBuiltin.values[index]);
+  }
+
+  int _extractEnumIndexFromConstantValue(
+      ConstantValue constant, ClassEntity classElement) {
+    if (constant is ConstructedConstantValue) {
+      if (constant.type.element == classElement) {
+        assert(constant.fields.length == 1 || constant.fields.length == 2);
+        ConstantValue indexConstant = constant.fields.values.first;
+        if (indexConstant is IntConstantValue) {
+          return indexConstant.primitiveValue;
+        }
+      }
+    }
+    return null;
+  }
 }
 
 /// Visitor that converts string literals and concatenations of string literals
 /// into the string value.
 class Stringifier extends ir.ExpressionVisitor<String> {
   @override
   String visitStringLiteral(ir.StringLiteral node) => node.value;
 
   @override
   String visitStringConcatenation(ir.StringConcatenation node) {
@@ skipping 495 matching lines @@
   /// [closureClassMaps].
   LoopClosureRepresentationInfo getClosureRepresentationInfoForLoop(
       ClosureDataLookup closureLookup, ir.TreeNode node);
 }
 
 /// Comparator for the canonical order or named arguments.
 // TODO(johnniwinther): Remove this when named parameters are sorted in dill.
 int namedOrdering(ir.VariableDeclaration a, ir.VariableDeclaration b) {
   return a.name.compareTo(b.name);
 }