- Ensure that BaseIsolate is only used to break the header include cycles.

runtime/vm/handles.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_HANDLES_H_
 #define VM_HANDLES_H_
 
 #include "vm/allocation.h"
 #include "vm/flags.h"
 #include "vm/os.h"
@@ skipping 279 matching lines @@
 // It is used as follows:
 // {
 //   HANDLESCOPE(isolate);
 //   ....
 //   .....
 //   code that creates some scoped handles.
 //   ....
 // }
 class HandleScope : public StackResource {
  public:
-  explicit HandleScope(BaseIsolate* isolate);
+  explicit HandleScope(Isolate* isolate);
   ~HandleScope();
 
  private:
   VMHandles::HandlesBlock* saved_handle_block_;  // Handle block at prev scope.
   uword saved_handle_slot_;  // Next available handle slot at previous scope.
 #if defined(DEBUG)
   HandleScope* link_;  // Link to previous scope.
 #endif
   DISALLOW_IMPLICIT_CONSTRUCTORS(HandleScope);
 };
@@ skipping 11 matching lines @@
 // {
 //   NOHANDLESCOPE(isolate);
 //   ....
 //   .....
 //   critical code that manipulates dart objects directly.
 //   ....
 // }
 #if defined(DEBUG)
 class NoHandleScope : public StackResource {
  public:
-  explicit NoHandleScope(BaseIsolate* isolate);
+  explicit NoHandleScope(Isolate* isolate);
   NoHandleScope();
   ~NoHandleScope();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NoHandleScope);
 };
 #else  // defined(DEBUG)
 class NoHandleScope : public ValueObject {
  public:
-  explicit NoHandleScope(BaseIsolate* isolate) { }
+  explicit NoHandleScope(Isolate* isolate) { }
   NoHandleScope() { }
   ~NoHandleScope() { }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NoHandleScope);
 };
 #endif  // defined(DEBUG)
 
 // Macro to start a no handles scope in the code.
 #define NOHANDLESCOPE(isolate)                                                 \
     dart::NoHandleScope no_vm_internal_handles_scope_(isolate);
 
 }  // namespace dart
 
 #endif  // VM_HANDLES_H_