author | tonyp |
Thu, 22 Jul 2010 10:27:41 -0400 | |
changeset 6248 | 2e661807cef0 |
parent 5892 | 477b32b9d021 |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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class MutableSpace; |
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class ObjectStartArray; |
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class PSPromotionManager; |
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class GCTaskQueue; |
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class CardTableExtension : public CardTableModRefBS { |
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private: |
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// Support methods for resizing the card table. |
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// resize_commit_uncommit() returns true if the pages were committed or |
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// uncommitted |
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bool resize_commit_uncommit(int changed_region, MemRegion new_region); |
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void resize_update_card_table_entries(int changed_region, |
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MemRegion new_region); |
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void resize_update_committed_table(int changed_region, MemRegion new_region); |
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void resize_update_covered_table(int changed_region, MemRegion new_region); |
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protected: |
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static void verify_all_young_refs_precise_helper(MemRegion mr); |
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public: |
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enum ExtendedCardValue { |
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youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, |
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verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5 |
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}; |
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CardTableExtension(MemRegion whole_heap, int max_covered_regions) : |
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CardTableModRefBS(whole_heap, max_covered_regions) { } |
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// Too risky for the 4/10/02 putback |
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// BarrierSet::Name kind() { return BarrierSet::CardTableExtension; } |
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// Scavenge support |
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void scavenge_contents(ObjectStartArray* start_array, |
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MutableSpace* sp, |
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HeapWord* space_top, |
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PSPromotionManager* pm); |
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void scavenge_contents_parallel(ObjectStartArray* start_array, |
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MutableSpace* sp, |
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HeapWord* space_top, |
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PSPromotionManager* pm, |
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uint stripe_number); |
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// Verification |
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static void verify_all_young_refs_imprecise(); |
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static void verify_all_young_refs_precise(); |
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bool addr_is_marked_imprecise(void *addr); |
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bool addr_is_marked_precise(void *addr); |
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void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; } |
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// Testers for entries |
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static bool card_is_dirty(int value) { return value == dirty_card; } |
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static bool card_is_newgen(int value) { return value == youngergen_card; } |
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static bool card_is_clean(int value) { return value == clean_card; } |
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static bool card_is_verify(int value) { return value == verify_card; } |
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// Card marking |
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void inline_write_ref_field_gc(void* field, oop new_val) { |
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jbyte* byte = byte_for(field); |
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*byte = youngergen_card; |
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} |
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// Adaptive size policy support |
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// Allows adjustment of the base and size of the covered regions |
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void resize_covered_region(MemRegion new_region); |
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// Finds the covered region to resize based on the start address |
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// of the covered regions. |
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void resize_covered_region_by_start(MemRegion new_region); |
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// Finds the covered region to resize based on the end address |
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// of the covered regions. |
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void resize_covered_region_by_end(int changed_region, MemRegion new_region); |
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// Finds the lowest start address of a covered region that is |
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// previous (i.e., lower index) to the covered region with index "ind". |
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HeapWord* lowest_prev_committed_start(int ind) const; |
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#ifdef ASSERT |
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bool is_valid_card_address(jbyte* addr) { |
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return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); |
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} |
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#endif // ASSERT |
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}; |