Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp @ 3249:e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
| author | johnc |
|---|---|
| date | Thu, 07 Apr 2011 09:53:20 -0700 |
| parents | 0ac769a57c64 |
| children | 92add02409c9 |
| rev | line source |
|---|---|
| 342 | 1 /* |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2324
diff
changeset
|
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
845
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
845
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
845
diff
changeset
|
21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP | |
| 27 | |
| 28 #include "memory/cardTableModRefBS.hpp" | |
| 29 #include "memory/memRegion.hpp" | |
| 30 #include "oops/oop.inline.hpp" | |
| 31 | |
| 342 | 32 #ifndef SERIALGC |
| 33 | |
| 34 class DirtyCardQueueSet; | |
| 35 | |
| 36 // This barrier is specialized to use a logging barrier to support | |
| 37 // snapshot-at-the-beginning marking. | |
| 38 | |
| 39 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { | |
|
3249
e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
johnc
parents:
2324
diff
changeset
|
40 public: |
| 342 | 41 // Add "pre_val" to a set of objects that may have been disconnected from the |
| 42 // pre-marking object graph. | |
| 43 static void enqueue(oop pre_val); | |
| 44 | |
| 45 G1SATBCardTableModRefBS(MemRegion whole_heap, | |
| 46 int max_covered_regions); | |
| 47 | |
| 48 bool is_a(BarrierSet::Name bsn) { | |
| 49 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); | |
| 50 } | |
| 51 | |
| 52 virtual bool has_write_ref_pre_barrier() { return true; } | |
| 53 | |
| 54 // This notes that we don't need to access any BarrierSet data | |
| 55 // structures, so this can be called from a static context. | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
56 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
57 T heap_oop = oopDesc::load_heap_oop(field); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
58 if (!oopDesc::is_null(heap_oop)) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
59 enqueue(oopDesc::decode_heap_oop(heap_oop)); |
| 342 | 60 } |
| 61 } | |
| 62 | |
| 63 // We export this to make it available in cases where the static | |
| 64 // type of the barrier set is known. Note that it is non-virtual. | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
65 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
| 342 | 66 write_ref_field_pre_static(field, newVal); |
| 67 } | |
| 68 | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
69 // These are the more general virtual versions. |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
70 virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
71 inline_write_ref_field_pre(field, new_val); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
72 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
73 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
| 342 | 74 inline_write_ref_field_pre(field, new_val); |
| 75 } | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
76 virtual void write_ref_field_pre_work(void* field, oop new_val) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
77 guarantee(false, "Not needed"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
78 } |
| 342 | 79 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
80 template <class T> void write_ref_array_pre_work(T* dst, int count); |
| 2324 | 81 virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) { |
| 82 if (!dest_uninitialized) { | |
| 83 write_ref_array_pre_work(dst, count); | |
| 84 } | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
85 } |
| 2324 | 86 virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) { |
| 87 if (!dest_uninitialized) { | |
| 88 write_ref_array_pre_work(dst, count); | |
| 89 } | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
342
diff
changeset
|
90 } |
| 342 | 91 }; |
| 92 | |
| 93 // Adds card-table logging to the post-barrier. | |
| 94 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. | |
| 95 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { | |
| 96 private: | |
| 97 DirtyCardQueueSet& _dcqs; | |
| 98 public: | |
| 99 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, | |
| 100 int max_covered_regions); | |
| 101 | |
| 102 bool is_a(BarrierSet::Name bsn) { | |
| 103 return bsn == BarrierSet::G1SATBCTLogging || | |
| 104 G1SATBCardTableModRefBS::is_a(bsn); | |
| 105 } | |
| 106 | |
| 107 void write_ref_field_work(void* field, oop new_val); | |
| 108 | |
| 109 // Can be called from static contexts. | |
| 110 static void write_ref_field_static(void* field, oop new_val); | |
| 111 | |
| 112 // NB: if you do a whole-heap invalidation, the "usual invariant" defined | |
| 113 // above no longer applies. | |
| 114 void invalidate(MemRegion mr, bool whole_heap = false); | |
| 115 | |
| 116 void write_region_work(MemRegion mr) { invalidate(mr); } | |
| 117 void write_ref_array_work(MemRegion mr) { invalidate(mr); } | |
| 118 | |
| 119 | |
| 120 }; | |
| 121 | |
| 122 | |
| 123 #endif // SERIALGC | |
| 1972 | 124 |
| 125 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |