0
|
1 /*
|
|
2 * Copyright 1998-2007 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 # 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
|
|
53 void OopRecorder::copy_to(CodeBlob* code) {
|
|
54 assert(_complete, "must be frozen");
|
|
55 maybe_initialize(); // get non-null handles, even if we have no oops
|
|
56 code->copy_oops(_handles);
|
|
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 }
|