8038399: Remove dead oop_iterate MemRegion variants from SharedHeap, Generation and Space classes

Reviewed-by: tschatzl, stefank

src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp

@@ -795,53 +795,6 @@ void CompactibleFreeListSpace::oop_iterate(ExtendedOopClosure* cl) {
   }
 }
 
-// Apply the given closure to each oop in the space \intersect memory region.
-void CompactibleFreeListSpace::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) {
-  assert_lock_strong(freelistLock());
-  if (is_empty()) {
-    return;
-  }
-  MemRegion cur = MemRegion(bottom(), end());
-  mr = mr.intersection(cur);
-  if (mr.is_empty()) {
-    return;
-  }
-  if (mr.equals(cur)) {
-    oop_iterate(cl);
-    return;
-  }
-  assert(mr.end() <= end(), "just took an intersection above");
-  HeapWord* obj_addr = block_start(mr.start());
-  HeapWord* t = mr.end();
-
-  SpaceMemRegionOopsIterClosure smr_blk(cl, mr);
-  if (block_is_obj(obj_addr)) {
-    // Handle first object specially.
-    oop obj = oop(obj_addr);
-    obj_addr += adjustObjectSize(obj->oop_iterate(&smr_blk));
-  } else {
-    FreeChunk* fc = (FreeChunk*)obj_addr;
-    obj_addr += fc->size();
-  }
-  while (obj_addr < t) {
-    HeapWord* obj = obj_addr;
-    obj_addr += block_size(obj_addr);
-    // If "obj_addr" is not greater than top, then the
-    // entire object "obj" is within the region.
-    if (obj_addr <= t) {
-      if (block_is_obj(obj)) {
-        oop(obj)->oop_iterate(cl);
-      }
-    } else {
-      // "obj" extends beyond end of region
-      if (block_is_obj(obj)) {
-        oop(obj)->oop_iterate(&smr_blk);
-      }
-      break;
-    }
-  }
-}
-
 // NOTE: In the following methods, in order to safely be able to
 // apply the closure to an object, we need to be sure that the
 // object has been initialized. We are guaranteed that an object

src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp

@@ -350,7 +350,6 @@ class CompactibleFreeListSpace: public CompactibleSpace {
   Mutex* freelistLock() const { return &_freelistLock; }
 
   // Iteration support
-  void oop_iterate(MemRegion mr, ExtendedOopClosure* cl);
   void oop_iterate(ExtendedOopClosure* cl);
 
   void object_iterate(ObjectClosure* blk);

src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp

@@ -3167,16 +3167,6 @@ ConcurrentMarkSweepGeneration::younger_refs_iterate(OopsInGenClosure* cl) {
   cl->reset_generation();
 }
 
-void
-ConcurrentMarkSweepGeneration::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) {
-  if (freelistLock()->owned_by_self()) {
-    Generation::oop_iterate(mr, cl);
-  } else {
-    MutexLockerEx x(freelistLock(), Mutex::_no_safepoint_check_flag);
-    Generation::oop_iterate(mr, cl);
-  }
-}
-
 void
 ConcurrentMarkSweepGeneration::oop_iterate(ExtendedOopClosure* cl) {
   if (freelistLock()->owned_by_self()) {

src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp

@@ -1285,7 +1285,6 @@ class ConcurrentMarkSweepGeneration: public CardGeneration {
   void save_sweep_limit();
 
   // More iteration support
-  virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl);
   virtual void oop_iterate(ExtendedOopClosure* cl);
   virtual void safe_object_iterate(ObjectClosure* cl);
   virtual void object_iterate(ObjectClosure* cl);

src/share/vm/memory/genCollectedHeap.cpp

@@ -846,12 +846,6 @@ void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) {
   }
 }
 
-void GenCollectedHeap::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) {
-  for (int i = 0; i < _n_gens; i++) {
-    _gens[i]->oop_iterate(mr, cl);
-  }
-}
-
 void GenCollectedHeap::object_iterate(ObjectClosure* cl) {
   for (int i = 0; i < _n_gens; i++) {
     _gens[i]->object_iterate(cl);

src/share/vm/memory/genCollectedHeap.hpp

@@ -220,7 +220,6 @@ public:
 
   // Iteration functions.
   void oop_iterate(ExtendedOopClosure* cl);
-  void oop_iterate(MemRegion mr, ExtendedOopClosure* cl);
   void object_iterate(ObjectClosure* cl);
   void safe_object_iterate(ObjectClosure* cl);
   Space* space_containing(const void* addr) const;

src/share/vm/memory/generation.cpp

@@ -297,22 +297,16 @@ bool Generation::block_is_obj(const HeapWord* p) const {
 
 class GenerationOopIterateClosure : public SpaceClosure {
  public:
-  ExtendedOopClosure* cl;
-  MemRegion mr;
+  ExtendedOopClosure* _cl;
   virtual void do_space(Space* s) {
-    s->oop_iterate(mr, cl);
+    s->oop_iterate(_cl);
   }
-  GenerationOopIterateClosure(ExtendedOopClosure* _cl, MemRegion _mr) :
-    cl(_cl), mr(_mr) {}
+  GenerationOopIterateClosure(ExtendedOopClosure* cl) :
+    _cl(cl) {}
 };
 
 void Generation::oop_iterate(ExtendedOopClosure* cl) {
-  GenerationOopIterateClosure blk(cl, _reserved);
-  space_iterate(&blk);
-}
-
-void Generation::oop_iterate(MemRegion mr, ExtendedOopClosure* cl) {
-  GenerationOopIterateClosure blk(cl, mr);
+  GenerationOopIterateClosure blk(cl);
   space_iterate(&blk);
 }
 

src/share/vm/memory/generation.hpp

@@ -543,10 +543,6 @@ class Generation: public CHeapObj<mtGC> {
   // generation, calling "cl.do_oop" on each.
   virtual void oop_iterate(ExtendedOopClosure* cl);
 
-  // Same as above, restricted to the intersection of a memory region and
-  // the generation.
-  virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl);
-
   // Iterate over all objects in the generation, calling "cl.do_object" on
   // each.
   virtual void object_iterate(ObjectClosure* cl);

src/share/vm/memory/sharedHeap.hpp

@@ -163,9 +163,6 @@ public:
   // Iteration functions.
   void oop_iterate(ExtendedOopClosure* cl) = 0;
 
-  // Same as above, restricted to a memory region.
-  virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl) = 0;
-
   // Iterate over all spaces in use in the heap, in an undefined order.
   virtual void space_iterate(SpaceClosure* cl) = 0;
 

src/share/vm/memory/space.cpp

@@ -44,9 +44,6 @@
 #include "utilities/globalDefinitions.hpp"
 #include "utilities/macros.hpp"
 
-void SpaceMemRegionOopsIterClosure::do_oop(oop* p)       { SpaceMemRegionOopsIterClosure::do_oop_work(p); }
-void SpaceMemRegionOopsIterClosure::do_oop(narrowOop* p) { SpaceMemRegionOopsIterClosure::do_oop_work(p); }
-
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 
 HeapWord* DirtyCardToOopClosure::get_actual_top(HeapWord* top,
@@ -690,43 +687,6 @@ void ContiguousSpace::oop_iterate(ExtendedOopClosure* blk) {
   }
 }
 
-void ContiguousSpace::oop_iterate(MemRegion mr, ExtendedOopClosure* blk) {
-  if (is_empty()) {
-    return;
-  }
-  MemRegion cur = MemRegion(bottom(), top());
-  mr = mr.intersection(cur);
-  if (mr.is_empty()) {
-    return;
-  }
-  if (mr.equals(cur)) {
-    oop_iterate(blk);
-    return;
-  }
-  assert(mr.end() <= top(), "just took an intersection above");
-  HeapWord* obj_addr = block_start(mr.start());
-  HeapWord* t = mr.end();
-
-  // Handle first object specially.
-  oop obj = oop(obj_addr);
-  SpaceMemRegionOopsIterClosure smr_blk(blk, mr);
-  obj_addr += obj->oop_iterate(&smr_blk);
-  while (obj_addr < t) {
-    oop obj = oop(obj_addr);
-    assert(obj->is_oop(), "expected an oop");
-    obj_addr += obj->size();
-    // If "obj_addr" is not greater than top, then the
-    // entire object "obj" is within the region.
-    if (obj_addr <= t) {
-      obj->oop_iterate(blk);
-    } else {
-      // "obj" extends beyond end of region
-      obj->oop_iterate(&smr_blk);
-      break;
-    }
-  };
-}
-
 void ContiguousSpace::object_iterate(ObjectClosure* blk) {
   if (is_empty()) return;
   WaterMark bm = bottom_mark();

src/share/vm/memory/space.hpp

@@ -65,31 +65,6 @@ class GenRemSet;
 class CardTableRS;
 class DirtyCardToOopClosure;
 
-// An oop closure that is circumscribed by a filtering memory region.
-class SpaceMemRegionOopsIterClosure: public ExtendedOopClosure {
- private:
-  ExtendedOopClosure* _cl;
-  MemRegion   _mr;
- protected:
-  template <class T> void do_oop_work(T* p) {
-    if (_mr.contains(p)) {
-      _cl->do_oop(p);
-    }
-  }
- public:
-  SpaceMemRegionOopsIterClosure(ExtendedOopClosure* cl, MemRegion mr):
-    _cl(cl), _mr(mr) {}
-  virtual void do_oop(oop* p);
-  virtual void do_oop(narrowOop* p);
-  virtual bool do_metadata() {
-    // _cl is of type ExtendedOopClosure instead of OopClosure, so that we can check this.
-    assert(!_cl->do_metadata(), "I've checked all call paths, this shouldn't happen.");
-    return false;
-  }
-  virtual void do_klass(Klass* k)                         { ShouldNotReachHere(); }
-  virtual void do_class_loader_data(ClassLoaderData* cld) { ShouldNotReachHere(); }
-};
-
 // A Space describes a heap area. Class Space is an abstract
 // base class.
 //
@@ -205,11 +180,6 @@ class Space: public CHeapObj<mtGC> {
   // applications of the closure are not included in the iteration.
   virtual void oop_iterate(ExtendedOopClosure* cl);
 
-  // Same as above, restricted to the intersection of a memory region and
-  // the space.  Fields in objects allocated by applications of the closure
-  // are not included in the iteration.
-  virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl) = 0;
-
   // Iterate over all objects in the space, calling "cl.do_object" on
   // each.  Objects allocated by applications of the closure are not
   // included in the iteration.
@@ -584,7 +554,6 @@ class ContiguousSpace: public CompactibleSpace {
 
   // Iteration
   void oop_iterate(ExtendedOopClosure* cl);
-  void oop_iterate(MemRegion mr, ExtendedOopClosure* cl);
   void object_iterate(ObjectClosure* blk);
   // For contiguous spaces this method will iterate safely over objects
   // in the space (i.e., between bottom and top) when at a safepoint.