Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/survRateGroup.hpp @ 1779:6eddcbe17c83
6981746: G1: SEGV with -XX:+TraceGen0Time
Summary: Pass correct value for length to NumberSeq constructor. Guard dereferences of "body_summary" pointer with a NULL check.
Reviewed-by: tonyp, ysr
author | johnc |
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date | Mon, 13 Sep 2010 10:00:24 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
25 class G1CollectorPolicy; | |
26 | |
27 class SurvRateGroup : public CHeapObj { | |
28 private: | |
29 G1CollectorPolicy* _g1p; | |
30 const char* _name; | |
31 | |
545 | 32 size_t _stats_arrays_length; |
342 | 33 double* _surv_rate; |
34 double* _accum_surv_rate_pred; | |
35 double _last_pred; | |
36 double _accum_surv_rate; | |
37 TruncatedSeq** _surv_rate_pred; | |
38 NumberSeq** _summary_surv_rates; | |
39 size_t _summary_surv_rates_len; | |
40 size_t _summary_surv_rates_max_len; | |
41 | |
42 int _all_regions_allocated; | |
545 | 43 size_t _region_num; |
342 | 44 size_t _setup_seq_num; |
45 | |
46 public: | |
47 SurvRateGroup(G1CollectorPolicy* g1p, | |
48 const char* name, | |
49 size_t summary_surv_rates_len); | |
545 | 50 void reset(); |
342 | 51 void start_adding_regions(); |
52 void stop_adding_regions(); | |
53 void record_surviving_words(int age_in_group, size_t surv_words); | |
54 void all_surviving_words_recorded(bool propagate); | |
55 const char* name() { return _name; } | |
56 | |
545 | 57 size_t region_num() { return _region_num; } |
342 | 58 double accum_surv_rate_pred(int age) { |
59 assert(age >= 0, "must be"); | |
545 | 60 if ((size_t)age < _stats_arrays_length) |
342 | 61 return _accum_surv_rate_pred[age]; |
62 else { | |
545 | 63 double diff = (double) (age - _stats_arrays_length + 1); |
64 return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred; | |
342 | 65 } |
66 } | |
67 | |
68 double accum_surv_rate(size_t adjustment); | |
69 | |
70 TruncatedSeq* get_seq(size_t age) { | |
71 if (age >= _setup_seq_num) { | |
72 guarantee( _setup_seq_num > 0, "invariant" ); | |
73 age = _setup_seq_num-1; | |
74 } | |
75 TruncatedSeq* seq = _surv_rate_pred[age]; | |
76 guarantee( seq != NULL, "invariant" ); | |
77 return seq; | |
78 } | |
79 | |
80 int next_age_index(); | |
81 int age_in_group(int age_index) { | |
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82 int ret = (int) (_all_regions_allocated - age_index); |
342 | 83 assert( ret >= 0, "invariant" ); |
84 return ret; | |
85 } | |
86 void finished_recalculating_age_indexes() { | |
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87 _all_regions_allocated = 0; |
342 | 88 } |
89 | |
90 #ifndef PRODUCT | |
91 void print(); | |
92 void print_surv_rate_summary(); | |
93 #endif // PRODUCT | |
94 }; |