Propagate failures from VirtualMemory::Commit.

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/lockers.h"
@@ skipping 51 matching lines @@
   static intptr_t ObjectStartOffset() {
     return Utils::RoundUp(sizeof(HeapPage), OS::kMaxPreferredCodeAlignment);
   }
 
  private:
   void set_object_end(uword val) {
     ASSERT((val & kObjectAlignmentMask) == kOldObjectAlignmentOffset);
     object_end_ = val;
   }
 
+  // These return NULL on OOM.
   static HeapPage* Initialize(VirtualMemory* memory, PageType type);
   static HeapPage* Allocate(intptr_t size_in_words, PageType type);
 
   // Deallocate the virtual memory backing this page. The page pointer to this
   // page becomes immediately inaccessible.
   void Deallocate();
 
   VirtualMemory* memory_;
   HeapPage* next_;
   uword object_end_;
@@ skipping 350 matching lines @@
   friend class ExclusiveLargePageIterator;
   friend class PageSpaceController;
   friend class SweeperTask;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PageSpace);
 };
 
 }  // namespace dart
 
 #endif  // VM_PAGES_H_