Mercurial > hg > graal-compiler
annotate src/share/vm/code/oopRecorder.cpp @ 1644:2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
Reviewed-by: kvn
author | never |
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date | Thu, 08 Jul 2010 14:29:44 -0700 |
parents | e9ff18c4ace7 |
children | f95d63e2154a |
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0 | 1 /* |
1579 | 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_oopRecorder.cpp.incl" | |
27 | |
28 #ifdef ASSERT | |
29 int OopRecorder::_find_index_calls = 0; | |
30 int OopRecorder::_hit_indexes = 0; | |
31 int OopRecorder::_missed_indexes = 0; | |
32 #endif //ASSERT | |
33 | |
34 | |
35 OopRecorder::OopRecorder(Arena* arena) { | |
36 _handles = NULL; | |
37 _indexes = NULL; | |
38 _arena = arena; | |
39 _complete = false; | |
40 } | |
41 | |
42 OopRecorder::IndexCache::IndexCache() { | |
43 assert(first_index > 0, "initial zero state of cache must be invalid index"); | |
44 Copy::zero_to_bytes(&_cache[0], sizeof(_cache)); | |
45 } | |
46 | |
47 int OopRecorder::oop_size() { | |
48 _complete = true; | |
49 if (_handles == NULL) return 0; | |
50 return _handles->length() * sizeof(oop); | |
51 } | |
52 | |
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53 void OopRecorder::copy_to(nmethod* nm) { |
0 | 54 assert(_complete, "must be frozen"); |
55 maybe_initialize(); // get non-null handles, even if we have no oops | |
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56 nm->copy_oops(_handles); |
0 | 57 } |
58 | |
59 void OopRecorder::maybe_initialize() { | |
60 if (_handles == NULL) { | |
61 if (_arena != NULL) { | |
62 _handles = new(_arena) GrowableArray<jobject>(_arena, 10, 0, 0); | |
63 _no_finds = new(_arena) GrowableArray<int>( _arena, 10, 0, 0); | |
64 } else { | |
65 _handles = new GrowableArray<jobject>(10, 0, 0); | |
66 _no_finds = new GrowableArray<int>( 10, 0, 0); | |
67 } | |
68 } | |
69 } | |
70 | |
71 | |
72 jobject OopRecorder::handle_at(int index) { | |
73 // there is always a NULL virtually present as first object | |
74 if (index == null_index) return NULL; | |
75 return _handles->at(index - first_index); | |
76 } | |
77 | |
78 | |
79 // Local definition. Used only in this module. | |
80 inline bool OopRecorder::is_real_jobject(jobject h) { | |
81 return h != NULL && h != (jobject)Universe::non_oop_word(); | |
82 } | |
83 | |
84 | |
85 int OopRecorder::add_handle(jobject h, bool make_findable) { | |
86 assert(!_complete, "cannot allocate more elements after size query"); | |
87 maybe_initialize(); | |
88 // indexing uses 1 as an origin--0 means null | |
89 int index = _handles->length() + first_index; | |
90 _handles->append(h); | |
91 | |
92 // Support correct operation of find_index(). | |
93 assert(!(make_findable && !is_real_jobject(h)), "nulls are not findable"); | |
94 if (make_findable) { | |
95 // This index may be returned from find_index(). | |
96 if (_indexes != NULL) { | |
97 int* cloc = _indexes->cache_location(h); | |
98 _indexes->set_cache_location_index(cloc, index); | |
99 } else if (index == index_cache_threshold && _arena != NULL) { | |
100 _indexes = new(_arena) IndexCache(); | |
101 for (int i = 0; i < _handles->length(); i++) { | |
102 // Load the cache with pre-existing elements. | |
103 int index0 = i + first_index; | |
104 if (_no_finds->contains(index0)) continue; | |
105 int* cloc = _indexes->cache_location(_handles->at(i)); | |
106 _indexes->set_cache_location_index(cloc, index0); | |
107 } | |
108 } | |
109 } else if (is_real_jobject(h)) { | |
110 // Remember that this index is not to be returned from find_index(). | |
111 // This case is rare, because most or all uses of allocate_index pass | |
112 // a jobject argument of NULL or Universe::non_oop_word. | |
113 // Thus, the expected length of _no_finds is zero. | |
114 _no_finds->append(index); | |
115 } | |
116 | |
117 return index; | |
118 } | |
119 | |
120 | |
121 int OopRecorder::maybe_find_index(jobject h) { | |
122 debug_only(_find_index_calls++); | |
123 assert(!_complete, "cannot allocate more elements after size query"); | |
124 maybe_initialize(); | |
125 if (h == NULL) return null_index; | |
126 assert(is_real_jobject(h), "must be valid jobject"); | |
127 int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h); | |
128 if (cloc != NULL) { | |
129 int cindex = _indexes->cache_location_index(cloc); | |
130 if (cindex == 0) { | |
131 return -1; // We know this handle is completely new. | |
132 } | |
133 if (cindex >= first_index && _handles->at(cindex - first_index) == h) { | |
134 debug_only(_hit_indexes++); | |
135 return cindex; | |
136 } | |
137 if (!_indexes->cache_location_collision(cloc)) { | |
138 return -1; // We know the current cache occupant is unique to that cloc. | |
139 } | |
140 } | |
141 | |
142 // Not found in cache, due to a cache collision. (Or, no cache at all.) | |
143 // Do a linear search, most recent to oldest. | |
144 for (int i = _handles->length() - 1; i >= 0; i--) { | |
145 if (_handles->at(i) == h) { | |
146 int findex = i + first_index; | |
147 if (_no_finds->contains(findex)) continue; // oops; skip this one | |
148 if (cloc != NULL) { | |
149 _indexes->set_cache_location_index(cloc, findex); | |
150 } | |
151 debug_only(_missed_indexes++); | |
152 return findex; | |
153 } | |
154 } | |
155 return -1; | |
156 } |