Support type literals as compile-time constants.

sdk/lib/_internal/compiler/implementation/js_backend/constant_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.
 
 part of js_backend;
 
 class ConstantEmitter implements ConstantVisitor {
   final Compiler compiler;
   final Namer namer;
 
@@ skipping 178 matching lines @@
           includeBackendMembers: true,
           includeSuperMembers: true);
       if ((constant.protoValue == null && emittedArgumentCount != 3) ||
           (constant.protoValue != null && emittedArgumentCount != 4)) {
         badFieldCountError();
       }
       buffer.add(")");
     }
   }
 
+  void visitType(TypeConstant constant) {
+    if (shouldEmitCanonicalVersion) {
+      emitCanonicalVersion(constant);
+    } else {
+      SourceString helperSourceName =
+          const SourceString('createRuntimeType');

[ngeoffray, 2012/11/19 16:54:09]

See my comment in compile_time_constant.dart. I'd prefer if we did the same as
literal maps, by calling a Dart factory constructor of an implementation class
that implements/extends Type.

[karlklose, 2012/11/20 14:04:38]

http://code.google.com/p/dart/issues/detail?id=6827

+      Element helper = compiler.findHelper(helperSourceName);
+      JavaScriptBackend backend = compiler.backend;
+      String helperName = backend.namer.getName(helper);
+      DartType type = constant.representedType;
+      Element element = type.element;
+      String typeName;
+      if (type.kind == TypeKind.INTERFACE) {
+        typeName =
+            compiler.codegenWorld.rti.generateRuntimeTypeString(element, 0);
+      } else {
+        assert(type.kind == TypeKind.TYPEDEF);
+        typeName = element.name.slowToString();
+      }
+      buffer.add("${namer.CURRENT_ISOLATE}.$helperName('$typeName')");
+    }
+  }
+
   void visitConstructed(ConstructedConstant constant) {
     if (shouldEmitCanonicalVersion) {
       emitCanonicalVersion(constant);
     } else {
       shouldEmitCanonicalVersion = true;
 
       buffer.add("new ");
       buffer.add(getJsConstructor(constant.type.element));
       buffer.add("(");
       for (int i = 0; i < constant.fields.length; i++) {
         if (i != 0) buffer.add(", ");
         _visit(constant.fields[i]);
       }
       buffer.add(")");
     }
   }
 }