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src/hotspot/share/gc/g1/g1ParScanThreadState.inline.hpp

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rev 52316 : imported patch 8212911-unify-reference-handling-during-gc
rev 52317 : imported patch 8212911-stefanj-review


  44   // References pushed onto the work stack should never point to a humongous region
  45   // as they are not added to the collection set due to above precondition.
  46   assert(!in_cset_state.is_humongous(),
  47          "Obj " PTR_FORMAT " should not refer to humongous region %u from " PTR_FORMAT,
  48          p2i(obj), _g1h->addr_to_region((HeapWord*)obj), p2i(p));
  49 
  50   if (!in_cset_state.is_in_cset()) {
  51     // In this case somebody else already did all the work.
  52     return;
  53   }
  54 
  55   markOop m = obj->mark_raw();
  56   if (m->is_marked()) {
  57     obj = (oop) m->decode_pointer();
  58   } else {
  59     obj = copy_to_survivor_space(in_cset_state, obj, m);
  60   }
  61   RawAccess<IS_NOT_NULL>::oop_store(p, obj);
  62 
  63   assert(obj != NULL, "Must be");
  64   if (!HeapRegion::is_in_same_region(p, obj)) {


  65     HeapRegion* from = _g1h->heap_region_containing(p);
  66     update_rs(from, p, obj);

  67   }
  68 }
  69 
  70 template <class T> inline void G1ParScanThreadState::push_on_queue(T* ref) {
  71   assert(verify_ref(ref), "sanity");
  72   _refs->push(ref);
  73 }
  74 
  75 inline void G1ParScanThreadState::do_oop_partial_array(oop* p) {
  76   assert(has_partial_array_mask(p), "invariant");
  77   oop from_obj = clear_partial_array_mask(p);
  78 
  79   assert(_g1h->is_in_reserved(from_obj), "must be in heap.");
  80   assert(from_obj->is_objArray(), "must be obj array");
  81   objArrayOop from_obj_array = objArrayOop(from_obj);
  82   // The from-space object contains the real length.
  83   int length                 = from_obj_array->length();
  84 
  85   assert(from_obj->is_forwarded(), "must be forwarded");
  86   oop to_obj                 = from_obj->forwardee();


  92   assert(0 <= next_index && next_index < length,
  93          "invariant, next index: %d, length: %d", next_index, length);
  94 
  95   int start                  = next_index;
  96   int end                    = length;
  97   int remainder              = end - start;
  98   // We'll try not to push a range that's smaller than ParGCArrayScanChunk.
  99   if (remainder > 2 * ParGCArrayScanChunk) {
 100     end = start + ParGCArrayScanChunk;
 101     to_obj_array->set_length(end);
 102     // Push the remainder before we process the range in case another
 103     // worker has run out of things to do and can steal it.
 104     oop* from_obj_p = set_partial_array_mask(from_obj);
 105     push_on_queue(from_obj_p);
 106   } else {
 107     assert(length == end, "sanity");
 108     // We'll process the final range for this object. Restore the length
 109     // so that the heap remains parsable in case of evacuation failure.
 110     to_obj_array->set_length(end);
 111   }
 112   _scanner.set_region(_g1h->heap_region_containing(to_obj));


 113   // Process indexes [start,end). It will also process the header
 114   // along with the first chunk (i.e., the chunk with start == 0).
 115   // Note that at this point the length field of to_obj_array is not
 116   // correct given that we are using it to keep track of the next
 117   // start index. oop_iterate_range() (thankfully!) ignores the length
 118   // field and only relies on the start / end parameters.  It does
 119   // however return the size of the object which will be incorrect. So
 120   // we have to ignore it even if we wanted to use it.
 121   to_obj_array->oop_iterate_range(&_scanner, start, end);
 122 }
 123 
 124 inline void G1ParScanThreadState::deal_with_reference(oop* ref_to_scan) {
 125   if (!has_partial_array_mask(ref_to_scan)) {
 126     do_oop_evac(ref_to_scan);
 127   } else {
 128     do_oop_partial_array(ref_to_scan);
 129   }
 130 }
 131 
 132 inline void G1ParScanThreadState::deal_with_reference(narrowOop* ref_to_scan) {




  44   // References pushed onto the work stack should never point to a humongous region
  45   // as they are not added to the collection set due to above precondition.
  46   assert(!in_cset_state.is_humongous(),
  47          "Obj " PTR_FORMAT " should not refer to humongous region %u from " PTR_FORMAT,
  48          p2i(obj), _g1h->addr_to_region((HeapWord*)obj), p2i(p));
  49 
  50   if (!in_cset_state.is_in_cset()) {
  51     // In this case somebody else already did all the work.
  52     return;
  53   }
  54 
  55   markOop m = obj->mark_raw();
  56   if (m->is_marked()) {
  57     obj = (oop) m->decode_pointer();
  58   } else {
  59     obj = copy_to_survivor_space(in_cset_state, obj, m);
  60   }
  61   RawAccess<IS_NOT_NULL>::oop_store(p, obj);
  62 
  63   assert(obj != NULL, "Must be");
  64   if (HeapRegion::is_in_same_region(p, obj)) {
  65     return;
  66   }
  67   HeapRegion* from = _g1h->heap_region_containing(p);
  68   if (!from->is_young()) {
  69     enqueue_card_if_tracked(p, obj);
  70   }
  71 }
  72 
  73 template <class T> inline void G1ParScanThreadState::push_on_queue(T* ref) {
  74   assert(verify_ref(ref), "sanity");
  75   _refs->push(ref);
  76 }
  77 
  78 inline void G1ParScanThreadState::do_oop_partial_array(oop* p) {
  79   assert(has_partial_array_mask(p), "invariant");
  80   oop from_obj = clear_partial_array_mask(p);
  81 
  82   assert(_g1h->is_in_reserved(from_obj), "must be in heap.");
  83   assert(from_obj->is_objArray(), "must be obj array");
  84   objArrayOop from_obj_array = objArrayOop(from_obj);
  85   // The from-space object contains the real length.
  86   int length                 = from_obj_array->length();
  87 
  88   assert(from_obj->is_forwarded(), "must be forwarded");
  89   oop to_obj                 = from_obj->forwardee();


  95   assert(0 <= next_index && next_index < length,
  96          "invariant, next index: %d, length: %d", next_index, length);
  97 
  98   int start                  = next_index;
  99   int end                    = length;
 100   int remainder              = end - start;
 101   // We'll try not to push a range that's smaller than ParGCArrayScanChunk.
 102   if (remainder > 2 * ParGCArrayScanChunk) {
 103     end = start + ParGCArrayScanChunk;
 104     to_obj_array->set_length(end);
 105     // Push the remainder before we process the range in case another
 106     // worker has run out of things to do and can steal it.
 107     oop* from_obj_p = set_partial_array_mask(from_obj);
 108     push_on_queue(from_obj_p);
 109   } else {
 110     assert(length == end, "sanity");
 111     // We'll process the final range for this object. Restore the length
 112     // so that the heap remains parsable in case of evacuation failure.
 113     to_obj_array->set_length(end);
 114   }
 115 
 116   HeapRegion* hr = _g1h->heap_region_containing(to_obj);
 117   _scanner.set_scanning_in_young(hr->is_young());
 118   // Process indexes [start,end). It will also process the header
 119   // along with the first chunk (i.e., the chunk with start == 0).
 120   // Note that at this point the length field of to_obj_array is not
 121   // correct given that we are using it to keep track of the next
 122   // start index. oop_iterate_range() (thankfully!) ignores the length
 123   // field and only relies on the start / end parameters.  It does
 124   // however return the size of the object which will be incorrect. So
 125   // we have to ignore it even if we wanted to use it.
 126   to_obj_array->oop_iterate_range(&_scanner, start, end);
 127 }
 128 
 129 inline void G1ParScanThreadState::deal_with_reference(oop* ref_to_scan) {
 130   if (!has_partial_array_mask(ref_to_scan)) {
 131     do_oop_evac(ref_to_scan);
 132   } else {
 133     do_oop_partial_array(ref_to_scan);
 134   }
 135 }
 136 
 137 inline void G1ParScanThreadState::deal_with_reference(narrowOop* ref_to_scan) {


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