Add a stub_code_space in the heap alongside code_space so that stub code generation happens here an…

vm/stack_frame.h

 // Copyright (c) 2011, 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_STACK_FRAME_H_
 #define VM_STACK_FRAME_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 #include "vm/stub_code.h"
@@ skipping 23 matching lines @@
   // Visit objects in the frame.
   virtual void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   // Print a frame.
   virtual void Print() const;
 
   // Check validity of a frame, used for assertion purposes.
   virtual bool IsValid() const;
 
   // Frame type.
-  virtual bool IsDartFrame() const { return LookupDartCode() != Code::null(); }
+  virtual bool IsDartFrame() const {
+    ASSERT(IsValid());
+    return !(IsStubFrame() || IsEntryFrame() || IsExitFrame());
+  }
   virtual bool IsStubFrame() const;
   virtual bool IsEntryFrame() const { return false; }
   virtual bool IsExitFrame() const { return false; }
 
   RawFunction* LookupDartFunction() const;
   RawCode* LookupDartCode() const;
   bool FindExceptionHandler(uword* handler_pc) const;
 
   // Find code object corresponding to pc (only frames running dart code or
   // stub code will have a code object associated with them).
@@ skipping 170 matching lines @@
 
  private:
   StackFrameIterator frames_;
 
   DISALLOW_COPY_AND_ASSIGN(DartFrameIterator);
 };
 
 }  // namespace dart
 
 #endif  // VM_STACK_FRAME_H_