Add near calls (32-bit displacement) to Code objects on X64 platform.

src/mark-compact.cc

 // Copyright 2006-2008 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 264 matching lines @@
     } else {
       MarkCompactCollector::MarkObject(code);
     }
   }
 
   void VisitDebugTarget(RelocInfo* rinfo) {
     ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()) &&
            rinfo->IsCallInstruction());
     HeapObject* code = Code::GetCodeFromTargetAddress(rinfo->call_address());
     MarkCompactCollector::MarkObject(code);
-    // When compacting we convert the call to a real object pointer.
-    if (IsCompacting()) rinfo->set_call_object(code);
   }
 
  private:
   // Mark object pointed to by p.
   void MarkObjectByPointer(Object** p) {
     if (!(*p)->IsHeapObject()) return;
     HeapObject* object = ShortCircuitConsString(p);
     MarkCompactCollector::MarkObject(object);
   }
 
@@ skipping 1079 matching lines @@
   }
 
   void VisitCodeTarget(RelocInfo* rinfo) {
     ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode()));
     Object* target = Code::GetCodeFromTargetAddress(rinfo->target_address());
     VisitPointer(&target);
     rinfo->set_target_address(
         reinterpret_cast<Code*>(target)->instruction_start());
   }
 
+  void VisitDebugTarget(RelocInfo* rinfo) {
+    ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()) && rinfo->IsCallInstruction());
+    Object* target = Code::GetCodeFromTargetAddress(rinfo->call_address());
+    VisitPointer(&target);
+    rinfo->set_call_address(
+        reinterpret_cast<Code*>(target)->instruction_start());
+  }
+
  private:
   void UpdatePointer(Object** p) {
     if (!(*p)->IsHeapObject()) return;
 
     HeapObject* obj = HeapObject::cast(*p);
     Address old_addr = obj->address();
     Address new_addr;
     ASSERT(!Heap::InFromSpace(obj));
 
     if (Heap::new_space()->Contains(obj)) {
@@ skipping 404 matching lines @@
 
 void MarkCompactCollector::RebuildRSets() {
 #ifdef DEBUG
   ASSERT(state_ == RELOCATE_OBJECTS);
   state_ = REBUILD_RSETS;
 #endif
   Heap::RebuildRSets();
 }
 
 } }  // namespace v8::internal