jdk8-mips64-public/hotspot: src/share/vm/memory/cardTableRS.hpp@f258c5828eb8 (annotated)

src/share/vm/memory/cardTableRS.hpp@f258c5828eb8 (annotated)

src/share/vm/memory/cardTableRS.hpp

Mon, 29 Apr 2013 16:13:57 -0400

author: hseigel
date: Mon, 29 Apr 2013 16:13:57 -0400
changeset 4987: f258c5828eb8
parent 4967: 5a9fa2ba85f0
child 5103: f9be75d21404
permissions: -rw-r--r--

8011773: Some tests on Interned String crashed JVM with OOM
Summary: Instead of terminating the VM, throw OutOfMemoryError exceptions.
Reviewed-by: coleenp, dholmes

 /*
  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_MEMORY_CARDTABLERS_HPP
 #define SHARE_VM_MEMORY_CARDTABLERS_HPP
 #include "memory/cardTableModRefBS.hpp"
 #include "memory/genRemSet.hpp"
 #include "memory/memRegion.hpp"
 class Space;
 class OopsInGenClosure;
 // This kind of "GenRemSet" uses a card table both as shared data structure
 // for a mod ref barrier set and for the rem set information.
 class CardTableRS: public GenRemSet {
   friend class VMStructs;
   // Below are private classes used in impl.
   friend class VerifyCTSpaceClosure;
   friend class ClearNoncleanCardWrapper;
   static jbyte clean_card_val() {
     return CardTableModRefBS::clean_card;
   }
   static intptr_t clean_card_row() {
     return CardTableModRefBS::clean_card_row;
   }
   static bool
   card_is_dirty_wrt_gen_iter(jbyte cv) {
     return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv);
   }
   CardTableModRefBSForCTRS* _ct_bs;
   virtual void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl);
   void verify_space(Space* s, HeapWord* gen_start);
   enum ExtendedCardValue {
     youngergen_card   = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
     // These are for parallel collection.
     // There are three P (parallel) youngergen card values.  In general, this
     // needs to be more than the number of generations (including the perm
     // gen) that might have younger_refs_do invoked on them separately.  So
     // if we add more gens, we have to add more values.
     youngergenP1_card  = CardTableModRefBS::CT_MR_BS_last_reserved + 2,
     youngergenP2_card  = CardTableModRefBS::CT_MR_BS_last_reserved + 3,
     youngergenP3_card  = CardTableModRefBS::CT_MR_BS_last_reserved + 4,
     cur_youngergen_and_prev_nonclean_card =
       CardTableModRefBS::CT_MR_BS_last_reserved + 5
   };
   // An array that contains, for each generation, the card table value last
   // used as the current value for a younger_refs_do iteration of that
   // portion of the table.  (The perm gen is index 0; other gens are at
   // their level plus 1.  They youngest gen is in the table, but will
   // always have the value "clean_card".)
   jbyte* _last_cur_val_in_gen;
   jbyte _cur_youngergen_card_val;
   int _regions_to_iterate;
   jbyte cur_youngergen_card_val() {
     return _cur_youngergen_card_val;
   }
   void set_cur_youngergen_card_val(jbyte v) {
     _cur_youngergen_card_val = v;
   }
   bool is_prev_youngergen_card_val(jbyte v) {
     return
       youngergen_card <= v &&
       v < cur_youngergen_and_prev_nonclean_card &&
       v != _cur_youngergen_card_val;
   }
   // Return a youngergen_card_value that is not currently in use.
   jbyte find_unused_youngergenP_card_value();
 public:
   CardTableRS(MemRegion whole_heap, int max_covered_regions);
   // *** GenRemSet functions.
   GenRemSet::Name rs_kind() { return GenRemSet::CardTable; }
   CardTableRS* as_CardTableRS() { return this; }
   CardTableModRefBS* ct_bs() { return _ct_bs; }
   // Override.
   void prepare_for_younger_refs_iterate(bool parallel);
   // Card table entries are cleared before application; "blk" is
   // responsible for dirtying if the oop is still older-to-younger after
   // closure application.
   void younger_refs_iterate(Generation* g, OopsInGenClosure* blk);
   void inline_write_ref_field_gc(void* field, oop new_val) {
     jbyte* byte = _ct_bs->byte_for(field);
     *byte = youngergen_card;
   }
   void write_ref_field_gc_work(void* field, oop new_val) {
     inline_write_ref_field_gc(field, new_val);
   }
   // Override.  Might want to devirtualize this in the same fashion as
   // above.  Ensures that the value of the card for field says that it's
   // a younger card in the current collection.
   virtual void write_ref_field_gc_par(void* field, oop new_val);
   void resize_covered_region(MemRegion new_region);
   bool is_aligned(HeapWord* addr) {
     return _ct_bs->is_card_aligned(addr);
   }
   void verify();
   void verify_aligned_region_empty(MemRegion mr);
   void clear(MemRegion mr) { _ct_bs->clear(mr); }
   void clear_into_younger(Generation* gen);
   void invalidate(MemRegion mr, bool whole_heap = false) {
     _ct_bs->invalidate(mr, whole_heap);
   }
   void invalidate_or_clear(Generation* gen, bool younger);
   static uintx ct_max_alignment_constraint() {
     return CardTableModRefBS::ct_max_alignment_constraint();
   }
   jbyte* byte_for(void* p)     { return _ct_bs->byte_for(p); }
   jbyte* byte_after(void* p)   { return _ct_bs->byte_after(p); }
   HeapWord* addr_for(jbyte* p) { return _ct_bs->addr_for(p); }
   bool is_prev_nonclean_card_val(jbyte v) {
     return
       youngergen_card <= v &&
       v <= cur_youngergen_and_prev_nonclean_card &&
       v != _cur_youngergen_card_val;
   }
   static bool youngergen_may_have_been_dirty(jbyte cv) {
     return cv == CardTableRS::cur_youngergen_and_prev_nonclean_card;
   }
 };
 class ClearNoncleanCardWrapper: public MemRegionClosure {
   DirtyCardToOopClosure* _dirty_card_closure;
   CardTableRS* _ct;
   bool _is_par;
 private:
   // Clears the given card, return true if the corresponding card should be
   // processed.
   inline bool clear_card(jbyte* entry);
   // Work methods called by the clear_card()
   inline bool clear_card_serial(jbyte* entry);
   inline bool clear_card_parallel(jbyte* entry);
   // check alignment of pointer
   bool is_word_aligned(jbyte* entry);
 public:
   ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct);
   void do_MemRegion(MemRegion mr);
 };
 #endif // SHARE_VM_MEMORY_CARDTABLERS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/cardTableRS.hpp@f258c5828eb8 (annotated)

src/share/vm/memory/cardTableRS.hpp