Support type parameters and classes as expression in the vm.

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 5887 matching lines @@
   }
   SetValue(instr, non_constant_);
 }
 
 
 void ConstantPropagator::VisitStoreVMField(StoreVMFieldInstr* instr) {
   SetValue(instr, instr->value()->definition()->constant_value());
 }
 
 
+void ConstantPropagator::VisitInstantiateType(InstantiateTypeInstr* instr) {
+  const Object& object =
+      instr->instantiator()->definition()->constant_value();
+  if (IsNonConstant(object)) {
+    SetValue(instr, non_constant_);
+    return;
+  }
+  if (IsConstant(object)) {
+    if (instr->type().IsTypeParameter()) {
+      if (object.IsNull()) {
+        SetValue(instr, Type::ZoneHandle(Type::DynamicType()));
+        return;
+      }
+      // We could try to instantiate the type parameter and return it if no
+      // malformed error is reported.
+    }
+    SetValue(instr, non_constant_);
+  }
+}
+
+
 void ConstantPropagator::VisitInstantiateTypeArguments(
     InstantiateTypeArgumentsInstr* instr) {
   const Object& object =
       instr->instantiator()->definition()->constant_value();
   if (IsNonConstant(object)) {
     SetValue(instr, non_constant_);
     return;
   }
   if (IsConstant(object)) {
     const intptr_t len = instr->type_arguments().Length();
@@ skipping 1242 matching lines @@
 
   // Insert materializations at environment uses.
   const Class& cls = Class::Handle(alloc->constructor().Owner());
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, cls, *fields);
   }
 }
 
 
 }  // namespace dart