Stop creating dummy call frames when calling out to C functions

runtime/vm/pages.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_PAGES_H_
 #define VM_PAGES_H_
 
 #include "vm/freelist.h"
 #include "vm/globals.h"
 #include "vm/virtual_memory.h"
@@ skipping 25 matching lines @@
     return memory_->Contains(addr);
   }
 
   uword object_start() const {
     return (reinterpret_cast<uword>(this) + ObjectStartOffset());
   }
   uword object_end() const {
     return object_end_;
   }
 
+  uword start() const {
+    return memory_->start();
+  }
+
+  uword end() const {
+    return memory_->end();
+  }

[siva, 2014/02/27 00:00:26]

Where are these used? I don't see any code using these accessors.

[Cutch, 2014/02/27 15:52:37]

Left over debug code. Removed.

+
   PageType type() const {
     return executable_ ? kExecutable : kData;
   }
 
   void VisitObjects(ObjectVisitor* visitor) const;
   void VisitObjectPointers(ObjectPointerVisitor* visitor) const;
 
   RawObject* FindObject(FindObjectVisitor* visitor) const;
 
   void WriteProtect(bool read_only);
@@ skipping 234 matching lines @@
   intptr_t collections_;
 
   friend class PageSpaceController;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PageSpace);
 };
 
 }  // namespace dart
 
 #endif  // VM_PAGES_H_