Fuchsia: Platform specific calls needed to Initialize and Cleanup VM.

runtime/vm/virtual_memory.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_VIRTUAL_MEMORY_H_
 #define VM_VIRTUAL_MEMORY_H_
 
 #include "platform/utils.h"
 #include "vm/globals.h"
 #include "vm/memory_region.h"
 
 namespace dart {
 
 class VirtualMemory {
  public:
   enum Protection {
     kNoAccess,
     kReadOnly,
     kReadWrite,
     kReadExecute,
     kReadWriteExecute
   };
 
   // The reserved memory is unmapped on destruction.
   ~VirtualMemory();
 
+  int32_t handle() const { return handle_; }
   uword start() const { return region_.start(); }
   uword end() const { return region_.end(); }
   void* address() const { return region_.pointer(); }
   intptr_t size() const { return region_.size(); }
 
   static void InitOnce();
 
   bool Contains(uword addr) const {
     return region_.Contains(addr);
   }
@@ skipping 38 matching lines @@
 
  private:
   static VirtualMemory* ReserveInternal(intptr_t size);
 
   // Free a sub segment. On operating systems that support it this
   // can give back the virtual memory to the system. Returns true on success.
   static bool FreeSubSegment(void* address, intptr_t size);
 
   // This constructor is only used internally when reserving new virtual spaces.
   // It does not reserve any virtual address space on its own.
-  explicit VirtualMemory(const MemoryRegion& region) :
+  explicit VirtualMemory(const MemoryRegion& region, int32_t handle = 0) :
       region_(region.pointer(), region.size()),
       reserved_size_(region.size()),
+      handle_(handle),
       embedder_allocated_(false) { }
 
   MemoryRegion region_;
 
   // The size of the underlying reservation not yet given back to the OS.
   // Its start coincides with region_, but its size might not, due to Truncate.
   intptr_t reserved_size_;
 
+  int32_t handle_;
+
   static uword page_size_;
 
   // True for a region provided by the embedder.
   bool embedder_allocated_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VirtualMemory);
 };
 
 }  // namespace dart
 
 #endif  // VM_VIRTUAL_MEMORY_H_