Implement type cast in the VM.

runtime/vm/flow_graph_builder.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 156 matching lines @@
                               const String& dst_name);
 
   void BuildStoreIndexedValues(StoreIndexedNode* node,
                                Value** array,
                                Value** index,
                                Value** value);
   void BuildInstanceSetterValues(InstanceSetterNode* node,
                                  Value** receiver,
                                  Value** value);
 
-  virtual void BuildInstanceOf(ComparisonNode* node);
+  virtual void BuildTypeTest(ComparisonNode* node);
+  virtual void BuildTypeCast(ComparisonNode* node);
 
   bool MustSaveRestoreContext(SequenceNode* node) const;
 
   // Moves parent context into the context register.
   void UnchainContext();
 
   void CloseFragment() { exit_ = NULL; }
   intptr_t AllocateTempIndex() { return temp_index_++; }
   void DeallocateTempIndex(intptr_t n) {
     ASSERT(temp_index_ >= n);
@@ skipping 75 matching lines @@
   // parameters).
   virtual void ReturnComputation(Computation* computation) {
     BindInstr* defn = new BindInstr(computation);
     AddInstruction(defn);
     ReturnValue(new UseVal(defn));
   }
 
   virtual void CompiletimeStringInterpolation(const Function& interpol_func,
                                               const Array& literals);
 
-  virtual void BuildInstanceOf(ComparisonNode* node);
+  virtual void BuildTypeTest(ComparisonNode* node);
+  virtual void BuildTypeCast(ComparisonNode* node);
 };
 
 
 // Translate an AstNode to a control-flow graph fragment for both its
 // effects and true/false control flow (e.g., for an expression in a test
 // context).  The resulting graph is always closed (even if it is empty)
 // Successor control flow is explicitly set by a pair of pointers to
 // TargetEntryInstr*.
 //
 // To distinguish between the graphs with only nonlocal exits and graphs
@@ skipping 37 matching lines @@
   // Output parameters.
   TargetEntryInstr** true_successor_address_;
   TargetEntryInstr** false_successor_address_;
 
   intptr_t condition_token_pos_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_