Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/genOopClosures.inline.hpp @ 517:e9be0e04635a
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
Summary: Added safe_object_iterate() for use by JMapPerm.
Reviewed-by: tonyp
author | jmasa |
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date | Tue, 06 Jan 2009 07:05:05 -0800 |
parents | 1ee8caae33af |
children | df6caf649ff7 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) : | |
26 OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { | |
27 set_generation(gen); | |
28 } | |
29 | |
30 inline void OopsInGenClosure::set_generation(Generation* gen) { | |
31 _gen = gen; | |
32 _gen_boundary = _gen->reserved().start(); | |
33 // Barrier set for the heap, must be set after heap is initialized | |
34 if (_rs == NULL) { | |
35 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
36 assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind"); | |
37 _rs = (CardTableRS*)rs; | |
38 } | |
39 } | |
40 | |
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41 template <class T> inline void OopsInGenClosure::do_barrier(T* p) { |
0 | 42 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
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43 assert(!oopDesc::is_null(*p), "expected non-null object"); |
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44 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 45 // If p points to a younger generation, mark the card. |
46 if ((HeapWord*)obj < _gen_boundary) { | |
47 _rs->inline_write_ref_field_gc(p, obj); | |
48 } | |
49 } | |
50 | |
342
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51 inline void OopsInGenClosure::par_do_barrier(oop* p) { |
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52 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
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53 oop obj = *p; |
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54 assert(obj != NULL, "expected non-null object"); |
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55 // If p points to a younger generation, mark the card. |
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56 if ((HeapWord*)obj < gen_boundary()) { |
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57 rs()->write_ref_field_gc_par(p, obj); |
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58 } |
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59 } |
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60 |
0 | 61 // NOTE! Any changes made here should also be made |
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62 // in FastScanClosure::do_oop_work() |
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63 template <class T> inline void ScanClosure::do_oop_work(T* p) { |
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64 T heap_oop = oopDesc::load_heap_oop(p); |
0 | 65 // Should we copy the obj? |
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66 if (!oopDesc::is_null(heap_oop)) { |
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67 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 68 if ((HeapWord*)obj < _boundary) { |
69 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
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70 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
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71 : _g->copy_to_survivor_space(obj); |
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72 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
0 | 73 } |
74 if (_gc_barrier) { | |
75 // Now call parent closure | |
76 do_barrier(p); | |
77 } | |
78 } | |
79 } | |
80 | |
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81 inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); } |
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82 inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); } |
0 | 83 |
84 // NOTE! Any changes made here should also be made | |
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85 // in ScanClosure::do_oop_work() |
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86 template <class T> inline void FastScanClosure::do_oop_work(T* p) { |
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87 T heap_oop = oopDesc::load_heap_oop(p); |
0 | 88 // Should we copy the obj? |
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89 if (!oopDesc::is_null(heap_oop)) { |
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90 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 91 if ((HeapWord*)obj < _boundary) { |
92 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
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93 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
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94 : _g->copy_to_survivor_space(obj); |
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95 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
0 | 96 if (_gc_barrier) { |
97 // Now call parent closure | |
98 do_barrier(p); | |
99 } | |
100 } | |
101 } | |
102 } | |
103 | |
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104 inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); } |
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105 inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
0 | 106 |
107 // Note similarity to ScanClosure; the difference is that | |
108 // the barrier set is taken care of outside this closure. | |
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109 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) { |
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110 assert(!oopDesc::is_null(*p), "null weak reference?"); |
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111 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 112 // weak references are sometimes scanned twice; must check |
113 // that to-space doesn't already contain this object | |
114 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { | |
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115 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
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116 : _g->copy_to_survivor_space(obj); |
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117 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
0 | 118 } |
119 } | |
120 | |
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121 inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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122 inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |