The way reloc entries are visited by the ObjectVisitor is architecture...

src/objects.cc

 // Copyright 2006-2009 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 5153 matching lines @@
 
 
 void Code::CodeIterateBody(ObjectVisitor* v) {
   int mode_mask = RelocInfo::kCodeTargetMask |
                   RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
                   RelocInfo::ModeMask(RelocInfo::EXTERNAL_REFERENCE) |
                   RelocInfo::ModeMask(RelocInfo::JS_RETURN) |
                   RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY);
 
   for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
-    RelocInfo::Mode rmode = it.rinfo()->rmode();
-    if (rmode == RelocInfo::EMBEDDED_OBJECT) {
-      v->VisitPointer(it.rinfo()->target_object_address());
-    } else if (RelocInfo::IsCodeTarget(rmode)) {
-      v->VisitCodeTarget(it.rinfo());
-    } else if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
-      v->VisitExternalReference(it.rinfo()->target_reference_address());
-#ifdef ENABLE_DEBUGGER_SUPPORT
-    } else if (Debug::has_break_points() &&
-               RelocInfo::IsJSReturn(rmode) &&
-               it.rinfo()->IsPatchedReturnSequence()) {
-      v->VisitDebugTarget(it.rinfo());
-#endif
-    } else if (rmode == RelocInfo::RUNTIME_ENTRY) {
-      v->VisitRuntimeEntry(it.rinfo());
-    }
+    it.rinfo()->Visit(v);
   }
 
   ScopeInfo<>::IterateScopeInfo(this, v);
 }
 
 
 void Code::Relocate(intptr_t delta) {
   for (RelocIterator it(this, RelocInfo::kApplyMask); !it.done(); it.next()) {
     it.rinfo()->apply(delta);
   }
@@ skipping 3349 matching lines @@
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 #endif
 
 
 } }  // namespace v8::internal