Add Zone-based handle allocation interface and reduce use of Isolate-based interfaces.

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 94 matching lines @@
 
   // Visit all of the various handles.
   void Visit(HandleVisitor* visitor);
 
   // Reset the handles so that we can reuse.
   void Reset();
 
   // Allocates a handle in the current handle scope. This handle is valid only
   // in the current handle scope and is destroyed when the current handle
   // scope ends.
-  static uword AllocateHandle(Isolate* isolate);
+  static uword AllocateHandle(Zone* zone);
 
   // Allocates a handle in the current zone. This handle will be destroyed
   // when the current zone is destroyed.
-  static uword AllocateZoneHandle(Isolate* isolate);
+  static uword AllocateZoneHandle(Zone* zone);
 
   // Returns true if specified handle is a zone handle.
   static bool IsZoneHandle(uword handle);
 
  protected:
   // Allocates space for a scoped handle.
   uword AllocateScopedHandle() {
     if (scoped_blocks_->IsFull()) {
       SetupNextScopeBlock();
     }
@@ skipping 131 matching lines @@
       OS::PrintErr("*** Starting a new VM handle block 0x%" Px "\n",
                    reinterpret_cast<intptr_t>(this));
     }
 #endif
   }
   ~VMHandles();
 
   // Visit all object pointers stored in the various handles.
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
-  // Allocates a handle in the current handle scope. This handle is valid only
-  // in the current handle scope and is destroyed when the current handle
-  // scope ends.
-  static uword AllocateHandle(Isolate* isolate);
+  // Allocates a handle in the current handle scope of 'zone', which must be
+  // the current zone. This handle is valid only in the current handle scope
+  // and is destroyed when the current handle scope ends.
+  static uword AllocateHandle(Zone* zone);
 
-  // Allocates a handle in the current zone. This handle will be destroyed
-  // when the current zone is destroyed.
-  static uword AllocateZoneHandle(Isolate* isolate);
+  // Allocates a handle in 'zone', which must be the current zone. This handle
+  // will be destroyed when the current zone is destroyed.
+  static uword AllocateZoneHandle(Zone* zone);
 
   // Returns true if specified handle is a zone handle.
   static bool IsZoneHandle(uword handle);
 
   // Returns number of handles, these functions are used for testing purposes.
   static int ScopedHandleCount();
   static int ZoneHandleCount();
 };
 
 
@@ skipping 59 matching lines @@
 };
 #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_