Microoptimizations to the way we get the current heap.

src/objects.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3469 matching lines @@
 #ifdef OBJECT_PRINT
   inline void CodePrint() {
     CodePrint(stdout);
   }
   void CodePrint(FILE* out);
 #endif
 #ifdef DEBUG
   void CodeVerify();
 #endif
 
+  // Returns the isolate/heap this code object belongs to.
+  inline Isolate* isolate();
+  inline Heap* heap();
+
   // Max loop nesting marker used to postpose OSR. We don't take loop
   // nesting that is deeper than 5 levels into account.
   static const int kMaxLoopNestingMarker = 6;
 
   // Layout description.
   static const int kInstructionSizeOffset = HeapObject::kHeaderSize;
   static const int kRelocationInfoOffset = kInstructionSizeOffset + kIntSize;
   static const int kDeoptimizationDataOffset =
       kRelocationInfoOffset + kPointerSize;
   static const int kFlagsOffset = kDeoptimizationDataOffset + kPointerSize;
@@ skipping 2502 matching lines @@
 #endif
 
   // Layout description.
   static const int kValueOffset = HeapObject::kHeaderSize;
   static const int kSize = kValueOffset + kPointerSize;
 
   typedef FixedBodyDescriptor<kValueOffset,
                               kValueOffset + kPointerSize,
                               kSize> BodyDescriptor;
 
+  // Returns the isolate/heap this cell object belongs to.
+  inline Isolate* isolate();
+  inline Heap* heap();
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalPropertyCell);
 };
 
 
 
 // Proxy describes objects pointing from JavaScript to C structures.
 // Since they cannot contain references to JS HeapObjects they can be
 // placed in old_data_space.
 class Proxy: public HeapObject {
@@ skipping 627 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_