Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp @ 845:df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
| author | ysr |
|---|---|
| date | Tue, 14 Jul 2009 15:40:39 -0700 |
| parents | 37f87013dfd8 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SERIALGC | |
| 26 | |
| 27 class DirtyCardQueueSet; | |
| 28 | |
| 29 // This barrier is specialized to use a logging barrier to support | |
| 30 // snapshot-at-the-beginning marking. | |
| 31 | |
| 32 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { | |
| 33 private: | |
| 34 // Add "pre_val" to a set of objects that may have been disconnected from the | |
| 35 // pre-marking object graph. | |
| 36 static void enqueue(oop pre_val); | |
| 37 | |
| 38 public: | |
| 39 G1SATBCardTableModRefBS(MemRegion whole_heap, | |
| 40 int max_covered_regions); | |
| 41 | |
| 42 bool is_a(BarrierSet::Name bsn) { | |
| 43 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); | |
| 44 } | |
| 45 | |
| 46 virtual bool has_write_ref_pre_barrier() { return true; } | |
| 47 | |
| 48 // This notes that we don't need to access any BarrierSet data | |
| 49 // structures, so this can be called from a static context. | |
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50 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
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51 T heap_oop = oopDesc::load_heap_oop(field); |
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52 if (!oopDesc::is_null(heap_oop)) { |
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53 enqueue(oopDesc::decode_heap_oop(heap_oop)); |
| 342 | 54 } |
| 55 } | |
| 56 | |
| 57 // When we know the current java thread: | |
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58 template <class T> static void write_ref_field_pre_static(T* field, oop newVal, |
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59 JavaThread* jt); |
| 342 | 60 |
| 61 // We export this to make it available in cases where the static | |
| 62 // type of the barrier set is known. Note that it is non-virtual. | |
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63 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
| 342 | 64 write_ref_field_pre_static(field, newVal); |
| 65 } | |
| 66 | |
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67 // These are the more general virtual versions. |
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68 virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
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69 inline_write_ref_field_pre(field, new_val); |
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70 } |
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71 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
| 342 | 72 inline_write_ref_field_pre(field, new_val); |
| 73 } | |
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74 virtual void write_ref_field_pre_work(void* field, oop new_val) { |
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75 guarantee(false, "Not needed"); |
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76 } |
| 342 | 77 |
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78 template <class T> void write_ref_array_pre_work(T* dst, int count); |
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79 virtual void write_ref_array_pre(oop* dst, int count) { |
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80 write_ref_array_pre_work(dst, count); |
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81 } |
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82 virtual void write_ref_array_pre(narrowOop* dst, int count) { |
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83 write_ref_array_pre_work(dst, count); |
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84 } |
| 342 | 85 }; |
| 86 | |
| 87 // Adds card-table logging to the post-barrier. | |
| 88 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. | |
| 89 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { | |
| 90 private: | |
| 91 DirtyCardQueueSet& _dcqs; | |
| 92 public: | |
| 93 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
| 94 int max_covered_regions); | |
| 95 | |
| 96 bool is_a(BarrierSet::Name bsn) { | |
| 97 return bsn == BarrierSet::G1SATBCTLogging || | |
| 98 G1SATBCardTableModRefBS::is_a(bsn); | |
| 99 } | |
| 100 | |
| 101 void write_ref_field_work(void* field, oop new_val); | |
| 102 | |
| 103 // Can be called from static contexts. | |
| 104 static void write_ref_field_static(void* field, oop new_val); | |
| 105 | |
| 106 // NB: if you do a whole-heap invalidation, the "usual invariant" defined | |
| 107 // above no longer applies. | |
| 108 void invalidate(MemRegion mr, bool whole_heap = false); | |
| 109 | |
| 110 void write_region_work(MemRegion mr) { invalidate(mr); } | |
| 111 void write_ref_array_work(MemRegion mr) { invalidate(mr); } | |
| 112 | |
| 113 | |
| 114 }; | |
| 115 | |
| 116 | |
| 117 #endif // SERIALGC |