hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp
author tonyp
Thu, 23 Apr 2009 16:58:16 -0400
changeset 2735 84d9ff956137
parent 2344 f2e09ba7ceab
child 2741 34e2a243d69a
permissions -rw-r--r--
6829013: G1: set the default value of G1VerifyConcMarkPrintRechable to false Summary: Turn off G1VerifyConcMarkPrintReachable by default to minimize the amount of verbose output we generate by default. Reviewed-by: jmasa
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/*
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 * Copyright 2001-2008 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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#include "incls/_precompiled.incl"
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#include "incls/_heapRegion.cpp.incl"
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HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1,
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                                 HeapRegion* hr, OopClosure* cl,
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                                 CardTableModRefBS::PrecisionStyle precision,
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                                 FilterKind fk) :
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  ContiguousSpaceDCTOC(hr, cl, precision, NULL),
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  _hr(hr), _fk(fk), _g1(g1)
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{}
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FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r,
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                                                   OopClosure* oc) :
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  _r_bottom(r->bottom()), _r_end(r->end()),
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  _oc(oc), _out_of_region(0)
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{}
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class VerifyLiveClosure: public OopClosure {
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  G1CollectedHeap* _g1h;
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  CardTableModRefBS* _bs;
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  oop _containing_obj;
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  bool _failures;
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  int _n_failures;
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public:
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  VerifyLiveClosure(G1CollectedHeap* g1h) :
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    _g1h(g1h), _bs(NULL), _containing_obj(NULL),
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    _failures(false), _n_failures(0)
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  {
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    BarrierSet* bs = _g1h->barrier_set();
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    if (bs->is_a(BarrierSet::CardTableModRef))
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      _bs = (CardTableModRefBS*)bs;
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  }
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  void set_containing_obj(oop obj) {
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    _containing_obj = obj;
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  }
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  bool failures() { return _failures; }
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  int n_failures() { return _n_failures; }
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  virtual void do_oop(narrowOop* p) {
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    guarantee(false, "NYI");
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  }
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  void do_oop(oop* p) {
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    assert(_containing_obj != NULL, "Precondition");
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    assert(!_g1h->is_obj_dead(_containing_obj), "Precondition");
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    oop obj = *p;
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    if (obj != NULL) {
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      bool failed = false;
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      if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead(obj)) {
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        if (!_failures) {
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          gclog_or_tty->print_cr("");
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          gclog_or_tty->print_cr("----------");
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        }
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        if (!_g1h->is_in_closed_subset(obj)) {
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          gclog_or_tty->print_cr("Field "PTR_FORMAT
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                        " of live obj "PTR_FORMAT
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                        " points to obj "PTR_FORMAT
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                        " not in the heap.",
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                        p, (void*) _containing_obj, (void*) obj);
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        } else {
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          gclog_or_tty->print_cr("Field "PTR_FORMAT
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                        " of live obj "PTR_FORMAT
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                        " points to dead obj "PTR_FORMAT".",
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                        p, (void*) _containing_obj, (void*) obj);
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        }
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        gclog_or_tty->print_cr("Live obj:");
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        _containing_obj->print_on(gclog_or_tty);
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        gclog_or_tty->print_cr("Bad referent:");
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        obj->print_on(gclog_or_tty);
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        gclog_or_tty->print_cr("----------");
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        _failures = true;
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        failed = true;
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        _n_failures++;
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      }
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      if (!_g1h->full_collection()) {
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        HeapRegion* from = _g1h->heap_region_containing(p);
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        HeapRegion* to   = _g1h->heap_region_containing(*p);
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        if (from != NULL && to != NULL &&
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            from != to &&
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            !to->isHumongous()) {
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          jbyte cv_obj = *_bs->byte_for_const(_containing_obj);
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          jbyte cv_field = *_bs->byte_for_const(p);
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          const jbyte dirty = CardTableModRefBS::dirty_card_val();
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          bool is_bad = !(from->is_young()
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                          || to->rem_set()->contains_reference(p)
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                          || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed
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                              (_containing_obj->is_objArray() ?
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                                  cv_field == dirty
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                               : cv_obj == dirty || cv_field == dirty));
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          if (is_bad) {
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            if (!_failures) {
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              gclog_or_tty->print_cr("");
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              gclog_or_tty->print_cr("----------");
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            }
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            gclog_or_tty->print_cr("Missing rem set entry:");
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            gclog_or_tty->print_cr("Field "PTR_FORMAT
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                          " of obj "PTR_FORMAT
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                          ", in region %d ["PTR_FORMAT
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                          ", "PTR_FORMAT"),",
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                          p, (void*) _containing_obj,
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                          from->hrs_index(),
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                          from->bottom(),
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                          from->end());
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            _containing_obj->print_on(gclog_or_tty);
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            gclog_or_tty->print_cr("points to obj "PTR_FORMAT
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                          " in region %d ["PTR_FORMAT
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                          ", "PTR_FORMAT").",
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                          (void*) obj, to->hrs_index(),
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                          to->bottom(), to->end());
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            obj->print_on(gclog_or_tty);
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            gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.",
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                          cv_obj, cv_field);
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            gclog_or_tty->print_cr("----------");
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            _failures = true;
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            if (!failed) _n_failures++;
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          }
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        }
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      }
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    }
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  }
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};
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template<class ClosureType>
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HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h,
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                               HeapRegion* hr,
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                               HeapWord* cur, HeapWord* top) {
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  oop cur_oop = oop(cur);
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  int oop_size = cur_oop->size();
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  HeapWord* next_obj = cur + oop_size;
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  while (next_obj < top) {
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    // Keep filtering the remembered set.
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    if (!g1h->is_obj_dead(cur_oop, hr)) {
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      // Bottom lies entirely below top, so we can call the
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      // non-memRegion version of oop_iterate below.
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#ifndef PRODUCT
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      if (G1VerifyMarkingInEvac) {
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        VerifyLiveClosure vl_cl(g1h);
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        cur_oop->oop_iterate(&vl_cl);
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      }
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#endif
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      cur_oop->oop_iterate(cl);
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    }
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    cur = next_obj;
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    cur_oop = oop(cur);
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    oop_size = cur_oop->size();
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    next_obj = cur + oop_size;
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  }
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  return cur;
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}
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void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr,
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                                              HeapWord* bottom,
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                                              HeapWord* top,
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                                              OopClosure* cl) {
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  G1CollectedHeap* g1h = _g1;
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  int oop_size;
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  OopClosure* cl2 = cl;
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  FilterIntoCSClosure intoCSFilt(this, g1h, cl);
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  FilterOutOfRegionClosure outOfRegionFilt(_hr, cl);
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  switch (_fk) {
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  case IntoCSFilterKind:      cl2 = &intoCSFilt; break;
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  case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break;
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  }
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  // Start filtering what we add to the remembered set. If the object is
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  // not considered dead, either because it is marked (in the mark bitmap)
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  // or it was allocated after marking finished, then we add it. Otherwise
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  // we can safely ignore the object.
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  if (!g1h->is_obj_dead(oop(bottom), _hr)) {
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#ifndef PRODUCT
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    if (G1VerifyMarkingInEvac) {
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      VerifyLiveClosure vl_cl(g1h);
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      oop(bottom)->oop_iterate(&vl_cl, mr);
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    }
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#endif
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    oop_size = oop(bottom)->oop_iterate(cl2, mr);
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  } else {
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    oop_size = oop(bottom)->size();
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  }
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  bottom += oop_size;
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  if (bottom < top) {
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    // We replicate the loop below for several kinds of possible filters.
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    switch (_fk) {
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    case NoFilterKind:
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      bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top);
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      break;
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    case IntoCSFilterKind: {
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      FilterIntoCSClosure filt(this, g1h, cl);
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      bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top);
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      break;
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    }
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    case OutOfRegionFilterKind: {
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      FilterOutOfRegionClosure filt(_hr, cl);
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      bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top);
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      break;
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    }
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    default:
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      ShouldNotReachHere();
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    }
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    // Last object. Need to do dead-obj filtering here too.
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    if (!g1h->is_obj_dead(oop(bottom), _hr)) {
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#ifndef PRODUCT
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      if (G1VerifyMarkingInEvac) {
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        VerifyLiveClosure vl_cl(g1h);
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        oop(bottom)->oop_iterate(&vl_cl, mr);
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      }
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#endif
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      oop(bottom)->oop_iterate(cl2, mr);
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    }
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  }
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}
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void HeapRegion::reset_after_compaction() {
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  G1OffsetTableContigSpace::reset_after_compaction();
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  // After a compaction the mark bitmap is invalid, so we must
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  // treat all objects as being inside the unmarked area.
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  zero_marked_bytes();
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  init_top_at_mark_start();
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}
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DirtyCardToOopClosure*
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HeapRegion::new_dcto_closure(OopClosure* cl,
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                             CardTableModRefBS::PrecisionStyle precision,
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                             HeapRegionDCTOC::FilterKind fk) {
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  return new HeapRegionDCTOC(G1CollectedHeap::heap(),
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                             this, cl, precision, fk);
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}
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void HeapRegion::hr_clear(bool par, bool clear_space) {
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  _humongous_type = NotHumongous;
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  _humongous_start_region = NULL;
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  _in_collection_set = false;
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  _is_gc_alloc_region = false;
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  // Age stuff (if parallel, this will be done separately, since it needs
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  // to be sequential).
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  G1CollectedHeap* g1h = G1CollectedHeap::heap();
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  set_young_index_in_cset(-1);
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  uninstall_surv_rate_group();
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  set_young_type(NotYoung);
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  // In case it had been the start of a humongous sequence, reset its end.
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  set_end(_orig_end);
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  if (!par) {
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    // If this is parallel, this will be done later.
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    HeapRegionRemSet* hrrs = rem_set();
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    if (hrrs != NULL) hrrs->clear();
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    _claimed = InitialClaimValue;
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  }
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  zero_marked_bytes();
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  set_sort_index(-1);
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  _offsets.resize(HeapRegion::GrainWords);
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  init_top_at_mark_start();
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  if (clear_space) clear(SpaceDecorator::Mangle);
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}
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// <PREDICTION>
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void HeapRegion::calc_gc_efficiency() {
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  G1CollectedHeap* g1h = G1CollectedHeap::heap();
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  _gc_efficiency = (double) garbage_bytes() /
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                            g1h->predict_region_elapsed_time_ms(this, false);
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}
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// </PREDICTION>
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void HeapRegion::set_startsHumongous() {
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  _humongous_type = StartsHumongous;
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  _humongous_start_region = this;
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  assert(end() == _orig_end, "Should be normal before alloc.");
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}
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bool HeapRegion::claimHeapRegion(jint claimValue) {
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  jint current = _claimed;
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  if (current != claimValue) {
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    jint res = Atomic::cmpxchg(claimValue, &_claimed, current);
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    if (res == current) {
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      return true;
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   313
    }
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  }
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  return false;
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}
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HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) {
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  HeapWord* low = addr;
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  HeapWord* high = end();
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  while (low < high) {
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   322
    size_t diff = pointer_delta(high, low);
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    // Must add one below to bias toward the high amount.  Otherwise, if
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  // "high" were at the desired value, and "low" were one less, we
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    // would not converge on "high".  This is not symmetric, because
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    // we set "high" to a block start, which might be the right one,
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    // which we don't do for "low".
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    HeapWord* middle = low + (diff+1)/2;
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   329
    if (middle == high) return high;
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   330
    HeapWord* mid_bs = block_start_careful(middle);
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   331
    if (mid_bs < addr) {
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   332
      low = middle;
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   333
    } else {
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   334
      high = mid_bs;
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   335
    }
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   336
  }
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   337
  assert(low == high && low >= addr, "Didn't work.");
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   338
  return low;
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   339
}
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   340
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   341
void HeapRegion::set_next_on_unclean_list(HeapRegion* r) {
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   342
  assert(r == NULL || r->is_on_unclean_list(), "Malformed unclean list.");
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   343
  _next_in_special_set = r;
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   344
}
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diff changeset
   345
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   346
void HeapRegion::set_on_unclean_list(bool b) {
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   347
  _is_on_unclean_list = b;
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   348
}
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void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) {
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  G1OffsetTableContigSpace::initialize(mr, false, mangle_space);
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  hr_clear(false/*par*/, clear_space);
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   353
}
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   354
#ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
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   355
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
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   356
#endif // _MSC_VER
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diff changeset
   357
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diff changeset
   358
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   359
HeapRegion::
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   360
HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray,
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   361
                     MemRegion mr, bool is_zeroed)
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   362
  : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed),
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   363
    _next_fk(HeapRegionDCTOC::NoFilterKind),
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   364
    _hrs_index(-1),
1387
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   365
    _humongous_type(NotHumongous), _humongous_start_region(NULL),
1374
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   366
    _in_collection_set(false), _is_gc_alloc_region(false),
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   367
    _is_on_free_list(false), _is_on_unclean_list(false),
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   368
    _next_in_special_set(NULL), _orig_end(NULL),
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   369
    _claimed(InitialClaimValue), _evacuation_failed(false),
1374
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   370
    _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1),
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   371
    _young_type(NotYoung), _next_young_region(NULL),
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   372
    _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1),
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   373
    _rem_set(NULL), _zfs(NotZeroFilled)
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diff changeset
   374
{
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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   375
  _orig_end = mr.end();
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   376
  // Note that initialize() will set the start of the unmarked area of the
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   377
  // region.
1388
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   378
  this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle);
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   379
  set_top(bottom());
tonyp
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   380
  set_saved_mark();
1374
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   381
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   382
  _rem_set =  new HeapRegionRemSet(sharedOffsetArray, this);
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diff changeset
   383
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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   384
  assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant.");
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   385
  // In case the region is allocated during a pause, note the top.
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diff changeset
   386
  // We haven't done any counting on a brand new region.
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   387
  _top_at_conc_mark_count = bottom();
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diff changeset
   388
}
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diff changeset
   389
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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   390
class NextCompactionHeapRegionClosure: public HeapRegionClosure {
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   391
  const HeapRegion* _target;
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   392
  bool _target_seen;
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   393
  HeapRegion* _last;
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   394
  CompactibleSpace* _res;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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   395
public:
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   396
  NextCompactionHeapRegionClosure(const HeapRegion* target) :
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   397
    _target(target), _target_seen(false), _res(NULL) {}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   398
  bool doHeapRegion(HeapRegion* cur) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   399
    if (_target_seen) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   400
      if (!cur->isHumongous()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   401
        _res = cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   402
        return true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   403
      }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   404
    } else if (cur == _target) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   405
      _target_seen = true;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   406
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   407
    return false;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   408
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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diff changeset
   409
  CompactibleSpace* result() { return _res; }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   410
};
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   411
4c24294029a9 6711316: Open source the Garbage-First garbage collector
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diff changeset
   412
CompactibleSpace* HeapRegion::next_compaction_space() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   413
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   414
  // cast away const-ness
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   415
  HeapRegion* r = (HeapRegion*) this;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   416
  NextCompactionHeapRegionClosure blk(r);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   417
  g1h->heap_region_iterate_from(r, &blk);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   418
  return blk.result();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   419
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   420
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   421
void HeapRegion::set_continuesHumongous(HeapRegion* start) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   422
  // The order is important here.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   423
  start->add_continuingHumongousRegion(this);
1387
580d4ae0a776 6722565: G1: assert !r->is_on_unclean_list() fires
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   424
  _humongous_type = ContinuesHumongous;
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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   425
  _humongous_start_region = start;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   426
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   427
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   428
void HeapRegion::add_continuingHumongousRegion(HeapRegion* cont) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   429
  // Must join the blocks of the current H region seq with the block of the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   430
  // added region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   431
  offsets()->join_blocks(bottom(), cont->bottom());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   432
  arrayOop obj = (arrayOop)(bottom());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   433
  obj->set_length((int) (obj->length() + cont->capacity()/jintSize));
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   434
  set_end(cont->end());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   435
  set_top(cont->end());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   436
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   437
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   438
void HeapRegion::save_marks() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   439
  set_saved_mark();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   440
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   441
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   442
void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   443
  HeapWord* p = mr.start();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   444
  HeapWord* e = mr.end();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   445
  oop obj;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   446
  while (p < e) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   447
    obj = oop(p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   448
    p += obj->oop_iterate(cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   449
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   450
  assert(p == e, "bad memregion: doesn't end on obj boundary");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   451
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   452
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   453
#define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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   454
void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   455
  ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl);              \
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   456
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   457
SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   458
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   459
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   460
void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   461
  oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   462
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   463
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   464
#ifdef DEBUG
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   465
HeapWord* HeapRegion::allocate(size_t size) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
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diff changeset
   466
  jint state = zero_fill_state();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   467
  assert(!G1CollectedHeap::heap()->allocs_are_zero_filled() ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   468
         zero_fill_is_allocated(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   469
         "When ZF is on, only alloc in ZF'd regions");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   470
  return G1OffsetTableContigSpace::allocate(size);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   471
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   472
#endif
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   473
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   474
void HeapRegion::set_zero_fill_state_work(ZeroFillState zfs) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   475
  assert(top() == bottom() || zfs == Allocated,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   476
         "Region must be empty, or we must be setting it to allocated.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   477
  assert(ZF_mon->owned_by_self() ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   478
         Universe::heap()->is_gc_active(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   479
         "Must hold the lock or be a full GC to modify.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   480
  _zfs = zfs;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   481
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   482
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   483
void HeapRegion::set_zero_fill_complete() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   484
  set_zero_fill_state_work(ZeroFilled);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   485
  if (ZF_mon->owned_by_self()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   486
    ZF_mon->notify_all();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   487
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   488
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   489
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   490
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   491
void HeapRegion::ensure_zero_filled() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   492
  MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   493
  ensure_zero_filled_locked();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   494
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   495
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   496
void HeapRegion::ensure_zero_filled_locked() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   497
  assert(ZF_mon->owned_by_self(), "Precondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   498
  bool should_ignore_zf = SafepointSynchronize::is_at_safepoint();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   499
  assert(should_ignore_zf || Heap_lock->is_locked(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   500
         "Either we're in a GC or we're allocating a region.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   501
  switch (zero_fill_state()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   502
  case HeapRegion::NotZeroFilled:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   503
    set_zero_fill_in_progress(Thread::current());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   504
    {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   505
      ZF_mon->unlock();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   506
      Copy::fill_to_words(bottom(), capacity()/HeapWordSize);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   507
      ZF_mon->lock_without_safepoint_check();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   508
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   509
    // A trap.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   510
    guarantee(zero_fill_state() == HeapRegion::ZeroFilling
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   511
              && zero_filler() == Thread::current(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   512
              "AHA!  Tell Dave D if you see this...");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   513
    set_zero_fill_complete();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   514
    // gclog_or_tty->print_cr("Did sync ZF.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   515
    ConcurrentZFThread::note_sync_zfs();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   516
    break;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   517
  case HeapRegion::ZeroFilling:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   518
    if (should_ignore_zf) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   519
      // We can "break" the lock and take over the work.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   520
      Copy::fill_to_words(bottom(), capacity()/HeapWordSize);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   521
      set_zero_fill_complete();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   522
      ConcurrentZFThread::note_sync_zfs();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   523
      break;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   524
    } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   525
      ConcurrentZFThread::wait_for_ZF_completed(this);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   526
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   527
  case HeapRegion::ZeroFilled:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   528
    // Nothing to do.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   529
    break;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   530
  case HeapRegion::Allocated:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   531
    guarantee(false, "Should not call on allocated regions.");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   532
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   533
  assert(zero_fill_state() == HeapRegion::ZeroFilled, "Post");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   534
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   535
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   536
HeapWord*
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   537
HeapRegion::object_iterate_mem_careful(MemRegion mr,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   538
                                                 ObjectClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   539
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   540
  // We used to use "block_start_careful" here.  But we're actually happy
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   541
  // to update the BOT while we do this...
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   542
  HeapWord* cur = block_start(mr.start());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   543
  mr = mr.intersection(used_region());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   544
  if (mr.is_empty()) return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   545
  // Otherwise, find the obj that extends onto mr.start().
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   546
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   547
  assert(cur <= mr.start()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   548
         && (oop(cur)->klass() == NULL ||
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   549
             cur + oop(cur)->size() > mr.start()),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   550
         "postcondition of block_start");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   551
  oop obj;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   552
  while (cur < mr.end()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   553
    obj = oop(cur);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   554
    if (obj->klass() == NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   555
      // Ran into an unparseable point.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   556
      return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   557
    } else if (!g1h->is_obj_dead(obj)) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   558
      cl->do_object(obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   559
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   560
    if (cl->abort()) return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   561
    // The check above must occur before the operation below, since an
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   562
    // abort might invalidate the "size" operation.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   563
    cur += obj->size();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   564
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   565
  return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   566
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   567
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   568
HeapWord*
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   569
HeapRegion::
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   570
oops_on_card_seq_iterate_careful(MemRegion mr,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   571
                                     FilterOutOfRegionClosure* cl) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   572
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   573
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   574
  // If we're within a stop-world GC, then we might look at a card in a
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   575
  // GC alloc region that extends onto a GC LAB, which may not be
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   576
  // parseable.  Stop such at the "saved_mark" of the region.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   577
  if (G1CollectedHeap::heap()->is_gc_active()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   578
    mr = mr.intersection(used_region_at_save_marks());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   579
  } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   580
    mr = mr.intersection(used_region());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   581
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   582
  if (mr.is_empty()) return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   583
  // Otherwise, find the obj that extends onto mr.start().
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   584
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   585
  // We used to use "block_start_careful" here.  But we're actually happy
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   586
  // to update the BOT while we do this...
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   587
  HeapWord* cur = block_start(mr.start());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   588
  assert(cur <= mr.start(), "Postcondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   589
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   590
  while (cur <= mr.start()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   591
    if (oop(cur)->klass() == NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   592
      // Ran into an unparseable point.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   593
      return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   594
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   595
    // Otherwise...
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   596
    int sz = oop(cur)->size();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   597
    if (cur + sz > mr.start()) break;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   598
    // Otherwise, go on.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   599
    cur = cur + sz;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   600
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   601
  oop obj;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   602
  obj = oop(cur);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   603
  // If we finish this loop...
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   604
  assert(cur <= mr.start()
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   605
         && obj->klass() != NULL
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   606
         && cur + obj->size() > mr.start(),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   607
         "Loop postcondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   608
  if (!g1h->is_obj_dead(obj)) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   609
    obj->oop_iterate(cl, mr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   610
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   611
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   612
  HeapWord* next;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   613
  while (cur < mr.end()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   614
    obj = oop(cur);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   615
    if (obj->klass() == NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   616
      // Ran into an unparseable point.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   617
      return cur;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   618
    };
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   619
    // Otherwise:
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   620
    next = (cur + obj->size());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   621
    if (!g1h->is_obj_dead(obj)) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   622
      if (next < mr.end()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   623
        obj->oop_iterate(cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   624
      } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   625
        // this obj spans the boundary.  If it's an array, stop at the
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   626
        // boundary.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   627
        if (obj->is_objArray()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   628
          obj->oop_iterate(cl, mr);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   629
        } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   630
          obj->oop_iterate(cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   631
        }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   632
      }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   633
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   634
    cur = next;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   635
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   636
  return NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   637
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   638
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   639
void HeapRegion::print() const { print_on(gclog_or_tty); }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   640
void HeapRegion::print_on(outputStream* st) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   641
  if (isHumongous()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   642
    if (startsHumongous())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   643
      st->print(" HS");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   644
    else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   645
      st->print(" HC");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   646
  } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   647
    st->print("   ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   648
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   649
  if (in_collection_set())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   650
    st->print(" CS");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   651
  else if (is_gc_alloc_region())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   652
    st->print(" A ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   653
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   654
    st->print("   ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   655
  if (is_young())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   656
    st->print(is_scan_only() ? " SO" : (is_survivor() ? " SU" : " Y "));
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   657
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   658
    st->print("   ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   659
  if (is_empty())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   660
    st->print(" F");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   661
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   662
    st->print("  ");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   663
  st->print(" %d", _gc_time_stamp);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   664
  G1OffsetTableContigSpace::print_on(st);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   665
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   666
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   667
#define OBJ_SAMPLE_INTERVAL 0
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   668
#define BLOCK_SAMPLE_INTERVAL 100
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   669
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   670
// This really ought to be commoned up into OffsetTableContigSpace somehow.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   671
// We would need a mechanism to make that code skip dead objects.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   672
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   673
void HeapRegion::verify(bool allow_dirty) const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   674
  G1CollectedHeap* g1 = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   675
  HeapWord* p = bottom();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   676
  HeapWord* prev_p = NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   677
  int objs = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   678
  int blocks = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   679
  VerifyLiveClosure vl_cl(g1);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   680
  while (p < top()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   681
    size_t size = oop(p)->size();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   682
    if (blocks == BLOCK_SAMPLE_INTERVAL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   683
      guarantee(p == block_start_const(p + (size/2)),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   684
                "check offset computation");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   685
      blocks = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   686
    } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   687
      blocks++;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   688
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   689
    if (objs == OBJ_SAMPLE_INTERVAL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   690
      oop obj = oop(p);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   691
      if (!g1->is_obj_dead(obj, this)) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   692
        obj->verify();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   693
        vl_cl.set_containing_obj(obj);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   694
        obj->oop_iterate(&vl_cl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   695
        if (G1MaxVerifyFailures >= 0
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   696
            && vl_cl.n_failures() >= G1MaxVerifyFailures) break;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   697
      }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   698
      objs = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   699
    } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   700
      objs++;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   701
    }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   702
    prev_p = p;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   703
    p += size;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   704
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   705
  HeapWord* rend = end();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   706
  HeapWord* rtop = top();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   707
  if (rtop < rend) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   708
    guarantee(block_start_const(rtop + (rend - rtop) / 2) == rtop,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   709
              "check offset computation");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   710
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   711
  if (vl_cl.failures()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   712
    gclog_or_tty->print_cr("Heap:");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   713
    G1CollectedHeap::heap()->print();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   714
    gclog_or_tty->print_cr("");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   715
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   716
  if (G1VerifyConcMark &&
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   717
      G1VerifyConcMarkPrintReachable &&
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   718
      vl_cl.failures()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   719
    g1->concurrent_mark()->print_prev_bitmap_reachable();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   720
  }
2735
84d9ff956137 6829013: G1: set the default value of G1VerifyConcMarkPrintRechable to false
tonyp
parents: 2344
diff changeset
   721
  guarantee(!vl_cl.failures(), "region verification failed");
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   722
  guarantee(p == top(), "end of last object must match end of space");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   723
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   724
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   725
// G1OffsetTableContigSpace code; copied from space.cpp.  Hope this can go
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   726
// away eventually.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   727
1388
tonyp
parents: 1387
diff changeset
   728
void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) {
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   729
  // false ==> we'll do the clearing if there's clearing to be done.
1388
tonyp
parents: 1387
diff changeset
   730
  ContiguousSpace::initialize(mr, false, mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   731
  _offsets.zero_bottom_entry();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   732
  _offsets.initialize_threshold();
1388
tonyp
parents: 1387
diff changeset
   733
  if (clear_space) clear(mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   734
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   735
1388
tonyp
parents: 1387
diff changeset
   736
void G1OffsetTableContigSpace::clear(bool mangle_space) {
tonyp
parents: 1387
diff changeset
   737
  ContiguousSpace::clear(mangle_space);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   738
  _offsets.zero_bottom_entry();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   739
  _offsets.initialize_threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   740
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   741
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   742
void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   743
  Space::set_bottom(new_bottom);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   744
  _offsets.set_bottom(new_bottom);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   745
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   746
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   747
void G1OffsetTableContigSpace::set_end(HeapWord* new_end) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   748
  Space::set_end(new_end);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   749
  _offsets.resize(new_end - bottom());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   750
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   751
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   752
void G1OffsetTableContigSpace::print() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   753
  print_short();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   754
  gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", "
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   755
                INTPTR_FORMAT ", " INTPTR_FORMAT ")",
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   756
                bottom(), top(), _offsets.threshold(), end());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   757
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   758
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   759
HeapWord* G1OffsetTableContigSpace::initialize_threshold() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   760
  return _offsets.initialize_threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   761
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   762
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   763
HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   764
                                                    HeapWord* end) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   765
  _offsets.alloc_block(start, end);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   766
  return _offsets.threshold();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   767
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   768
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   769
HeapWord* G1OffsetTableContigSpace::saved_mark_word() const {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   770
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   771
  assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" );
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   772
  if (_gc_time_stamp < g1h->get_gc_time_stamp())
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   773
    return top();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   774
  else
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   775
    return ContiguousSpace::saved_mark_word();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   776
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   777
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   778
void G1OffsetTableContigSpace::set_saved_mark() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   779
  G1CollectedHeap* g1h = G1CollectedHeap::heap();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   780
  unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   781
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   782
  if (_gc_time_stamp < curr_gc_time_stamp) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   783
    // The order of these is important, as another thread might be
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   784
    // about to start scanning this region. If it does so after
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   785
    // set_saved_mark and before _gc_time_stamp = ..., then the latter
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   786
    // will be false, and it will pick up top() as the high water mark
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   787
    // of region. If it does so after _gc_time_stamp = ..., then it
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   788
    // will pick up the right saved_mark_word() as the high water mark
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   789
    // of the region. Either way, the behaviour will be correct.
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   790
    ContiguousSpace::set_saved_mark();
1385
1751733b089b 6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents: 1374
diff changeset
   791
    _gc_time_stamp = curr_gc_time_stamp;
1751733b089b 6723570: G1: assertion failure: p == current_top or oop(p)->is_oop(),"p is not a block start" (revisited!)
iveresov
parents: 1374
diff changeset
   792
    OrderAccess::fence();
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   793
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   794
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   795
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   796
G1OffsetTableContigSpace::
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   797
G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   798
                         MemRegion mr, bool is_zeroed) :
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   799
  _offsets(sharedOffsetArray, mr),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   800
  _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true),
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   801
  _gc_time_stamp(0)
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   802
{
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   803
  _offsets.set_space(this);
1388
tonyp
parents: 1387
diff changeset
   804
  initialize(mr, !is_zeroed, SpaceDecorator::Mangle);
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   805
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   806
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   807
size_t RegionList::length() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   808
  size_t len = 0;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   809
  HeapRegion* cur = hd();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   810
  DEBUG_ONLY(HeapRegion* last = NULL);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   811
  while (cur != NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   812
    len++;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   813
    DEBUG_ONLY(last = cur);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   814
    cur = get_next(cur);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   815
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   816
  assert(last == tl(), "Invariant");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   817
  return len;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   818
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   819
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   820
void RegionList::insert_before_head(HeapRegion* r) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   821
  assert(well_formed(), "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   822
  set_next(r, hd());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   823
  _hd = r;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   824
  _sz++;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   825
  if (tl() == NULL) _tl = r;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   826
  assert(well_formed(), "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   827
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   828
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   829
void RegionList::prepend_list(RegionList* new_list) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   830
  assert(well_formed(), "Precondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   831
  assert(new_list->well_formed(), "Precondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   832
  HeapRegion* new_tl = new_list->tl();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   833
  if (new_tl != NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   834
    set_next(new_tl, hd());
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   835
    _hd = new_list->hd();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   836
    _sz += new_list->sz();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   837
    if (tl() == NULL) _tl = new_list->tl();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   838
  } else {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   839
    assert(new_list->hd() == NULL && new_list->sz() == 0, "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   840
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   841
  assert(well_formed(), "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   842
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   843
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   844
void RegionList::delete_after(HeapRegion* r) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   845
  assert(well_formed(), "Precondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   846
  HeapRegion* next = get_next(r);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   847
  assert(r != NULL, "Precondition");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   848
  HeapRegion* next_tl = get_next(next);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   849
  set_next(r, next_tl);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   850
  dec_sz();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   851
  if (next == tl()) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   852
    assert(next_tl == NULL, "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   853
    _tl = r;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   854
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   855
  assert(well_formed(), "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   856
}
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   857
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   858
HeapRegion* RegionList::pop() {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   859
  assert(well_formed(), "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   860
  HeapRegion* res = hd();
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   861
  if (res != NULL) {
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   862
    _hd = get_next(res);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   863
    _sz--;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   864
    set_next(res, NULL);
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   865
    if (sz() == 0) _tl = NULL;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   866
  }
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   867
  assert(well_formed(), "Inv");
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   868
  return res;
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents:
diff changeset
   869
}