author | goetz |
Mon, 02 Dec 2013 10:26:14 +0100 | |
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/* |
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* Copyright (c) 2001, 2011, 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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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |
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#include "memory/cardTableModRefBS.hpp" |
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#include "memory/memRegion.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "utilities/macros.hpp" |
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#if INCLUDE_ALL_GCS |
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class DirtyCardQueueSet; |
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// This barrier is specialized to use a logging barrier to support |
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// snapshot-at-the-beginning marking. |
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class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { |
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protected: |
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enum G1CardValues { |
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g1_young_gen = CT_MR_BS_last_reserved << 1 |
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}; |
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public: |
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static int g1_young_card_val() { return g1_young_gen; } |
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// Add "pre_val" to a set of objects that may have been disconnected from the |
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// pre-marking object graph. |
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static void enqueue(oop pre_val); |
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G1SATBCardTableModRefBS(MemRegion whole_heap, |
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int max_covered_regions); |
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bool is_a(BarrierSet::Name bsn) { |
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return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); |
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} |
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virtual bool has_write_ref_pre_barrier() { return true; } |
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// This notes that we don't need to access any BarrierSet data |
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// structures, so this can be called from a static context. |
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template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
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T heap_oop = oopDesc::load_heap_oop(field); |
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if (!oopDesc::is_null(heap_oop)) { |
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enqueue(oopDesc::decode_heap_oop(heap_oop)); |
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} |
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} |
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// We export this to make it available in cases where the static |
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// type of the barrier set is known. Note that it is non-virtual. |
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template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
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write_ref_field_pre_static(field, newVal); |
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} |
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// These are the more general virtual versions. |
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virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
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inline_write_ref_field_pre(field, new_val); |
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} |
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virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
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inline_write_ref_field_pre(field, new_val); |
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} |
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virtual void write_ref_field_pre_work(void* field, oop new_val) { |
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guarantee(false, "Not needed"); |
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} |
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template <class T> void write_ref_array_pre_work(T* dst, int count); |
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virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) { |
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if (!dest_uninitialized) { |
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write_ref_array_pre_work(dst, count); |
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} |
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} |
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virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) { |
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if (!dest_uninitialized) { |
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write_ref_array_pre_work(dst, count); |
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} |
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} |
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/* |
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Claimed and deferred bits are used together in G1 during the evacuation |
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pause. These bits can have the following state transitions: |
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1. The claimed bit can be put over any other card state. Except that |
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the "dirty -> dirty and claimed" transition is checked for in |
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G1 code and is not used. |
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2. Deferred bit can be set only if the previous state of the card |
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was either clean or claimed. mark_card_deferred() is wait-free. |
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We do not care if the operation is be successful because if |
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it does not it will only result in duplicate entry in the update |
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buffer because of the "cache-miss". So it's not worth spinning. |
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*/ |
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bool is_card_claimed(size_t card_index) { |
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jbyte val = _byte_map[card_index]; |
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return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); |
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} |
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void set_card_claimed(size_t card_index) { |
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jbyte val = _byte_map[card_index]; |
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if (val == clean_card_val()) { |
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val = (jbyte)claimed_card_val(); |
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} else { |
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val |= (jbyte)claimed_card_val(); |
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} |
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_byte_map[card_index] = val; |
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} |
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void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN; |
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void g1_mark_as_young(const MemRegion& mr); |
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bool mark_card_deferred(size_t card_index); |
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bool is_card_deferred(size_t card_index) { |
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jbyte val = _byte_map[card_index]; |
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return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); |
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} |
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}; |
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// Adds card-table logging to the post-barrier. |
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// Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. |
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class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { |
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private: |
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DirtyCardQueueSet& _dcqs; |
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public: |
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G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, |
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int max_covered_regions); |
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bool is_a(BarrierSet::Name bsn) { |
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return bsn == BarrierSet::G1SATBCTLogging || |
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G1SATBCardTableModRefBS::is_a(bsn); |
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} |
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void write_ref_field_work(void* field, oop new_val, bool release = false); |
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// Can be called from static contexts. |
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static void write_ref_field_static(void* field, oop new_val); |
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// NB: if you do a whole-heap invalidation, the "usual invariant" defined |
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// above no longer applies. |
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void invalidate(MemRegion mr, bool whole_heap = false); |
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void write_region_work(MemRegion mr) { invalidate(mr); } |
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void write_ref_array_work(MemRegion mr) { invalidate(mr); } |
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}; |
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#endif // INCLUDE_ALL_GCS |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |