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1 /*
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2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_oopRecorder.cpp.incl"
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27
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28 #ifdef ASSERT
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29 int OopRecorder::_find_index_calls = 0;
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30 int OopRecorder::_hit_indexes = 0;
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31 int OopRecorder::_missed_indexes = 0;
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32 #endif //ASSERT
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33
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34
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35 OopRecorder::OopRecorder(Arena* arena) {
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36 _handles = NULL;
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37 _indexes = NULL;
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38 _arena = arena;
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39 _complete = false;
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40 }
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41
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42 OopRecorder::IndexCache::IndexCache() {
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43 assert(first_index > 0, "initial zero state of cache must be invalid index");
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44 Copy::zero_to_bytes(&_cache[0], sizeof(_cache));
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45 }
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46
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47 int OopRecorder::oop_size() {
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48 _complete = true;
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49 if (_handles == NULL) return 0;
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50 return _handles->length() * sizeof(oop);
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51 }
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52
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53 void OopRecorder::copy_to(CodeBlob* code) {
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54 assert(_complete, "must be frozen");
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55 maybe_initialize(); // get non-null handles, even if we have no oops
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56 code->copy_oops(_handles);
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57 }
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58
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59 void OopRecorder::maybe_initialize() {
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60 if (_handles == NULL) {
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61 if (_arena != NULL) {
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62 _handles = new(_arena) GrowableArray<jobject>(_arena, 10, 0, 0);
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63 _no_finds = new(_arena) GrowableArray<int>( _arena, 10, 0, 0);
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64 } else {
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65 _handles = new GrowableArray<jobject>(10, 0, 0);
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66 _no_finds = new GrowableArray<int>( 10, 0, 0);
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67 }
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68 }
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69 }
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70
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71
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72 jobject OopRecorder::handle_at(int index) {
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73 // there is always a NULL virtually present as first object
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74 if (index == null_index) return NULL;
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75 return _handles->at(index - first_index);
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76 }
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77
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78
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79 // Local definition. Used only in this module.
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80 inline bool OopRecorder::is_real_jobject(jobject h) {
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81 return h != NULL && h != (jobject)Universe::non_oop_word();
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82 }
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83
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84
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85 int OopRecorder::add_handle(jobject h, bool make_findable) {
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86 assert(!_complete, "cannot allocate more elements after size query");
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87 maybe_initialize();
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88 // indexing uses 1 as an origin--0 means null
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89 int index = _handles->length() + first_index;
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90 _handles->append(h);
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91
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92 // Support correct operation of find_index().
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93 assert(!(make_findable && !is_real_jobject(h)), "nulls are not findable");
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94 if (make_findable) {
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95 // This index may be returned from find_index().
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96 if (_indexes != NULL) {
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97 int* cloc = _indexes->cache_location(h);
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98 _indexes->set_cache_location_index(cloc, index);
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99 } else if (index == index_cache_threshold && _arena != NULL) {
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100 _indexes = new(_arena) IndexCache();
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101 for (int i = 0; i < _handles->length(); i++) {
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102 // Load the cache with pre-existing elements.
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103 int index0 = i + first_index;
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104 if (_no_finds->contains(index0)) continue;
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105 int* cloc = _indexes->cache_location(_handles->at(i));
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106 _indexes->set_cache_location_index(cloc, index0);
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107 }
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108 }
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109 } else if (is_real_jobject(h)) {
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110 // Remember that this index is not to be returned from find_index().
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111 // This case is rare, because most or all uses of allocate_index pass
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112 // a jobject argument of NULL or Universe::non_oop_word.
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113 // Thus, the expected length of _no_finds is zero.
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114 _no_finds->append(index);
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115 }
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116
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117 return index;
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118 }
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119
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120
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121 int OopRecorder::maybe_find_index(jobject h) {
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122 debug_only(_find_index_calls++);
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123 assert(!_complete, "cannot allocate more elements after size query");
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124 maybe_initialize();
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125 if (h == NULL) return null_index;
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126 assert(is_real_jobject(h), "must be valid jobject");
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127 int* cloc = (_indexes == NULL)? NULL: _indexes->cache_location(h);
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128 if (cloc != NULL) {
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129 int cindex = _indexes->cache_location_index(cloc);
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130 if (cindex == 0) {
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131 return -1; // We know this handle is completely new.
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132 }
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133 if (cindex >= first_index && _handles->at(cindex - first_index) == h) {
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134 debug_only(_hit_indexes++);
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135 return cindex;
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136 }
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137 if (!_indexes->cache_location_collision(cloc)) {
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138 return -1; // We know the current cache occupant is unique to that cloc.
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139 }
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140 }
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141
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142 // Not found in cache, due to a cache collision. (Or, no cache at all.)
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143 // Do a linear search, most recent to oldest.
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144 for (int i = _handles->length() - 1; i >= 0; i--) {
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145 if (_handles->at(i) == h) {
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146 int findex = i + first_index;
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147 if (_no_finds->contains(findex)) continue; // oops; skip this one
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148 if (cloc != NULL) {
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149 _indexes->set_cache_location_index(cloc, findex);
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150 }
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151 debug_only(_missed_indexes++);
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152 return findex;
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153 }
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154 }
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155 return -1;
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156 }
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