--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/cardTableRS.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2001-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class Space;
+class OopsInGenClosure;
+class DirtyCardToOopClosure;
+
+// 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 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;
+
+ 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(oop* field, oop new_val) {
+ jbyte* byte = _ct_bs.byte_for(field);
+ *byte = youngergen_card;
+ }
+ void write_ref_field_gc_work(oop* 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(oop* 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_empty(MemRegion mr);
+
+ void clear(MemRegion mr) { _ct_bs.clear(mr); }
+ void clear_into_younger(Generation* gen, bool clear_perm);
+
+ void invalidate(MemRegion mr) { _ct_bs.invalidate(mr); }
+ void invalidate_or_clear(Generation* gen, bool younger, bool perm);
+
+ 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;
+ }
+
+};