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1 /*
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2 * Copyright 1998-2006 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/_debugInfoRec.cpp.incl"
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27
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28 // Private definition.
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29 // There is one DIR_Chunk for each scope and values array.
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30 // A chunk can potentially be used more than once.
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31 // We keep track of these chunks in order to detect
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32 // repetition and enable sharing.
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33 class DIR_Chunk {
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34 friend class DebugInformationRecorder;
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35 int _offset; // location in the stream of this scope
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36 int _length; // number of bytes in the stream
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37 int _hash; // hash of stream bytes (for quicker reuse)
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38
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39 void* operator new(size_t ignore, DebugInformationRecorder* dir) {
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40 assert(ignore == sizeof(DIR_Chunk), "");
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41 if (dir->_next_chunk >= dir->_next_chunk_limit) {
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42 const int CHUNK = 100;
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43 dir->_next_chunk = NEW_RESOURCE_ARRAY(DIR_Chunk, CHUNK);
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44 dir->_next_chunk_limit = dir->_next_chunk + CHUNK;
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45 }
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46 return dir->_next_chunk++;
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47 }
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48
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49 DIR_Chunk(int offset, int length, DebugInformationRecorder* dir) {
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50 _offset = offset;
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51 _length = length;
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52 unsigned int hash = 0;
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53 address p = dir->stream()->buffer() + _offset;
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54 for (int i = 0; i < length; i++) {
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55 if (i == 6) break;
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56 hash *= 127;
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57 hash += p[i];
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58 }
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59 _hash = hash;
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60 }
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61
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62 DIR_Chunk* find_match(GrowableArray<DIR_Chunk*>* arr,
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63 int start_index,
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64 DebugInformationRecorder* dir) {
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65 int end_index = arr->length();
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66 int hash = this->_hash, length = this->_length;
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67 address buf = dir->stream()->buffer();
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68 for (int i = end_index; --i >= start_index; ) {
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69 DIR_Chunk* that = arr->at(i);
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70 if (hash == that->_hash &&
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71 length == that->_length &&
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72 0 == memcmp(buf + this->_offset, buf + that->_offset, length)) {
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73 return that;
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74 }
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75 }
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76 return NULL;
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77 }
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78 };
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79
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80 static inline bool compute_recording_non_safepoints() {
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81 if (JvmtiExport::should_post_compiled_method_load()
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82 && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
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83 // The default value of this flag is taken to be true,
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84 // if JVMTI is looking at nmethod codes.
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85 // We anticipate that JVMTI may wish to participate in profiling.
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86 return true;
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87 }
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88
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89 // If the flag is set manually, use it, whether true or false.
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90 // Otherwise, if JVMTI is not in the picture, use the default setting.
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91 // (This is true in debug, just for the exercise, false in product mode.)
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92 return DebugNonSafepoints;
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93 }
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94
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95 DebugInformationRecorder::DebugInformationRecorder(OopRecorder* oop_recorder)
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96 : _recording_non_safepoints(compute_recording_non_safepoints())
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97 {
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98 _pcs_size = 100;
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99 _pcs = NEW_RESOURCE_ARRAY(PcDesc, _pcs_size);
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100 _pcs_length = 0;
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101
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102 _prev_safepoint_pc = PcDesc::lower_offset_limit;
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103
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104 _stream = new DebugInfoWriteStream(this, 10 * K);
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105 // make sure that there is no stream_decode_offset that is zero
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106 _stream->write_byte((jbyte)0xFF);
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107
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108 // make sure that we can distinguish the value "serialized_null" from offsets
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109 assert(_stream->position() > serialized_null, "sanity");
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110
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111 _oop_recorder = oop_recorder;
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112
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113 _all_chunks = new GrowableArray<DIR_Chunk*>(300);
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114 _shared_chunks = new GrowableArray<DIR_Chunk*>(30);
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115 _next_chunk = _next_chunk_limit = NULL;
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116
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117 add_new_pc_offset(PcDesc::lower_offset_limit); // sentinel record
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118
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119 debug_only(_recording_state = rs_null);
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120 }
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121
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122
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123 void DebugInformationRecorder::add_oopmap(int pc_offset, OopMap* map) {
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124 // !!!!! Preserve old style handling of oopmaps for now
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125 _oopmaps->add_gc_map(pc_offset, map);
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126 }
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127
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128 void DebugInformationRecorder::add_safepoint(int pc_offset, OopMap* map) {
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129 assert(!_oop_recorder->is_complete(), "not frozen yet");
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130 // Store the new safepoint
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131
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132 // Add the oop map
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133 add_oopmap(pc_offset, map);
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134
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135 add_new_pc_offset(pc_offset);
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136
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137 assert(_recording_state == rs_null, "nesting of recording calls");
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138 debug_only(_recording_state = rs_safepoint);
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139 }
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140
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141 void DebugInformationRecorder::add_non_safepoint(int pc_offset) {
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142 assert(!_oop_recorder->is_complete(), "not frozen yet");
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143 assert(_recording_non_safepoints, "must be recording non-safepoints");
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144
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145 add_new_pc_offset(pc_offset);
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146
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147 assert(_recording_state == rs_null, "nesting of recording calls");
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148 debug_only(_recording_state = rs_non_safepoint);
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149 }
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150
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151 void DebugInformationRecorder::add_new_pc_offset(int pc_offset) {
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152 assert(_pcs_length == 0 || last_pc()->pc_offset() < pc_offset,
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153 "must specify a new, larger pc offset");
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154
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155 // add the pcdesc
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156 if (_pcs_length == _pcs_size) {
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157 // Expand
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158 int new_pcs_size = _pcs_size * 2;
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159 PcDesc* new_pcs = NEW_RESOURCE_ARRAY(PcDesc, new_pcs_size);
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160 for (int index = 0; index < _pcs_length; index++) {
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161 new_pcs[index] = _pcs[index];
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162 }
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163 _pcs_size = new_pcs_size;
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164 _pcs = new_pcs;
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165 }
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166 assert(_pcs_size > _pcs_length, "There must be room for after expanding");
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167
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168 _pcs[_pcs_length++] = PcDesc(pc_offset, DebugInformationRecorder::serialized_null,
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169 DebugInformationRecorder::serialized_null);
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170 }
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171
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172
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173 int DebugInformationRecorder::serialize_monitor_values(GrowableArray<MonitorValue*>* monitors) {
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174 if (monitors == NULL || monitors->is_empty()) return DebugInformationRecorder::serialized_null;
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175 assert(_recording_state == rs_safepoint, "must be recording a safepoint");
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176 int result = stream()->position();
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177 stream()->write_int(monitors->length());
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178 for (int index = 0; index < monitors->length(); index++) {
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179 monitors->at(index)->write_on(stream());
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180 }
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181 assert(result != serialized_null, "sanity");
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182
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183 // (See comment below on DebugInformationRecorder::describe_scope.)
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184 int shared_result = find_sharable_decode_offset(result);
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185 if (shared_result != serialized_null) {
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186 stream()->set_position(result);
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187 result = shared_result;
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188 }
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189
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190 return result;
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191 }
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192
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193
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194 int DebugInformationRecorder::serialize_scope_values(GrowableArray<ScopeValue*>* values) {
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195 if (values == NULL || values->is_empty()) return DebugInformationRecorder::serialized_null;
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196 assert(_recording_state == rs_safepoint, "must be recording a safepoint");
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197 int result = stream()->position();
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198 assert(result != serialized_null, "sanity");
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199 stream()->write_int(values->length());
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200 for (int index = 0; index < values->length(); index++) {
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201 values->at(index)->write_on(stream());
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202 }
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203
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204 // (See comment below on DebugInformationRecorder::describe_scope.)
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205 int shared_result = find_sharable_decode_offset(result);
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206 if (shared_result != serialized_null) {
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207 stream()->set_position(result);
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208 result = shared_result;
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209 }
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210
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211 return result;
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212 }
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213
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214
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215 #ifndef PRODUCT
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216 // These variables are put into one block to reduce relocations
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217 // and make it simpler to print from the debugger.
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218 static
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219 struct dir_stats_struct {
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220 int chunks_queried;
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221 int chunks_shared;
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222 int chunks_reshared;
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223 int chunks_elided;
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224
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225 void print() {
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226 tty->print_cr("Debug Data Chunks: %d, shared %d+%d, non-SP's elided %d",
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227 chunks_queried,
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228 chunks_shared, chunks_reshared,
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229 chunks_elided);
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230 }
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231 } dir_stats;
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232 #endif //PRODUCT
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233
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234
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235 int DebugInformationRecorder::find_sharable_decode_offset(int stream_offset) {
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236 // Only pull this trick if non-safepoint recording
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237 // is enabled, for now.
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238 if (!recording_non_safepoints())
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239 return serialized_null;
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240
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241 NOT_PRODUCT(++dir_stats.chunks_queried);
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242 int stream_length = stream()->position() - stream_offset;
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243 assert(stream_offset != serialized_null, "should not be null");
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244 assert(stream_length != 0, "should not be empty");
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245
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246 DIR_Chunk* ns = new(this) DIR_Chunk(stream_offset, stream_length, this);
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247
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248 // Look in previously shared scopes first:
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249 DIR_Chunk* ms = ns->find_match(_shared_chunks, 0, this);
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250 if (ms != NULL) {
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251 NOT_PRODUCT(++dir_stats.chunks_reshared);
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252 assert(ns+1 == _next_chunk, "");
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253 _next_chunk = ns;
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254 return ms->_offset;
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255 }
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256
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257 // Look in recently encountered scopes next:
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258 const int MAX_RECENT = 50;
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259 int start_index = _all_chunks->length() - MAX_RECENT;
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260 if (start_index < 0) start_index = 0;
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261 ms = ns->find_match(_all_chunks, start_index, this);
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262 if (ms != NULL) {
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263 NOT_PRODUCT(++dir_stats.chunks_shared);
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264 // Searching in _all_chunks is limited to a window,
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265 // but searching in _shared_chunks is unlimited.
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266 _shared_chunks->append(ms);
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267 assert(ns+1 == _next_chunk, "");
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268 _next_chunk = ns;
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269 return ms->_offset;
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270 }
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271
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272 // No match. Add this guy to the list, in hopes of future shares.
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273 _all_chunks->append(ns);
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274 return serialized_null;
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275 }
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276
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277
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278 // must call add_safepoint before: it sets PcDesc and this routine uses
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279 // the last PcDesc set
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280 void DebugInformationRecorder::describe_scope(int pc_offset,
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281 ciMethod* method,
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282 int bci,
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283 DebugToken* locals,
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284 DebugToken* expressions,
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285 DebugToken* monitors) {
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286 assert(_recording_state != rs_null, "nesting of recording calls");
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287 PcDesc* last_pd = last_pc();
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288 assert(last_pd->pc_offset() == pc_offset, "must be last pc");
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289 int sender_stream_offset = last_pd->scope_decode_offset();
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290 // update the stream offset of current pc desc
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291 int stream_offset = stream()->position();
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292 last_pd->set_scope_decode_offset(stream_offset);
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293
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294 // serialize sender stream offest
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295 stream()->write_int(sender_stream_offset);
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296
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297 // serialize scope
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298 jobject method_enc = (method == NULL)? NULL: method->encoding();
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299 stream()->write_int(oop_recorder()->find_index(method_enc));
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300 stream()->write_bci(bci);
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301 assert(method == NULL ||
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302 (method->is_native() && bci == 0) ||
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303 (!method->is_native() && 0 <= bci && bci < method->code_size()) ||
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304 bci == -1, "illegal bci");
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305
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306 // serialize the locals/expressions/monitors
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307 stream()->write_int((intptr_t) locals);
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308 stream()->write_int((intptr_t) expressions);
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309 stream()->write_int((intptr_t) monitors);
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310
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311 // Here's a tricky bit. We just wrote some bytes.
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312 // Wouldn't it be nice to find that we had already
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313 // written those same bytes somewhere else?
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314 // If we get lucky this way, reset the stream
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315 // and reuse the old bytes. By the way, this
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316 // trick not only shares parent scopes, but also
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317 // compresses equivalent non-safepoint PcDescs.
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318 int shared_stream_offset = find_sharable_decode_offset(stream_offset);
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319 if (shared_stream_offset != serialized_null) {
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320 stream()->set_position(stream_offset);
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321 last_pd->set_scope_decode_offset(shared_stream_offset);
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322 }
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323 }
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324
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325 void DebugInformationRecorder::dump_object_pool(GrowableArray<ScopeValue*>* objects) {
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326 guarantee( _pcs_length > 0, "safepoint must exist before describing scopes");
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327 PcDesc* last_pd = &_pcs[_pcs_length-1];
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328 if (objects != NULL) {
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329 for (int i = objects->length() - 1; i >= 0; i--) {
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330 ((ObjectValue*) objects->at(i))->set_visited(false);
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331 }
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332 }
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333 int offset = serialize_scope_values(objects);
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334 last_pd->set_obj_decode_offset(offset);
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335 }
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336
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337 void DebugInformationRecorder::end_scopes(int pc_offset, bool is_safepoint) {
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338 assert(_recording_state == (is_safepoint? rs_safepoint: rs_non_safepoint),
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339 "nesting of recording calls");
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340 debug_only(_recording_state = rs_null);
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341
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342 // Try to compress away an equivalent non-safepoint predecessor.
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343 // (This only works because we have previously recognized redundant
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344 // scope trees and made them use a common scope_decode_offset.)
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345 if (_pcs_length >= 2 && recording_non_safepoints()) {
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346 PcDesc* last = last_pc();
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347 PcDesc* prev = prev_pc();
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348 // If prev is (a) not a safepoint and (b) has the same
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349 // stream pointer, then it can be coalesced into the last.
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350 // This is valid because non-safepoints are only sought
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351 // with pc_desc_near, which (when it misses prev) will
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352 // search forward until it finds last.
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353 // In addition, it does not matter if the last PcDesc
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354 // is for a safepoint or not.
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355 if (_prev_safepoint_pc < prev->pc_offset() &&
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356 prev->scope_decode_offset() == last->scope_decode_offset()) {
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357 assert(prev == last-1, "sane");
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358 prev->set_pc_offset(pc_offset);
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359 _pcs_length -= 1;
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360 NOT_PRODUCT(++dir_stats.chunks_elided);
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361 }
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362 }
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363
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364 // We have just recorded this safepoint.
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365 // Remember it in case the previous paragraph needs to know.
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366 if (is_safepoint) {
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367 _prev_safepoint_pc = pc_offset;
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368 }
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369 }
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370
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371 DebugToken* DebugInformationRecorder::create_scope_values(GrowableArray<ScopeValue*>* values) {
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372 assert(!_oop_recorder->is_complete(), "not frozen yet");
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373 return (DebugToken*) (intptr_t) serialize_scope_values(values);
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374 }
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375
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376
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377 DebugToken* DebugInformationRecorder::create_monitor_values(GrowableArray<MonitorValue*>* monitors) {
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378 assert(!_oop_recorder->is_complete(), "not frozen yet");
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379 return (DebugToken*) (intptr_t) serialize_monitor_values(monitors);
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380 }
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381
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382
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383 int DebugInformationRecorder::data_size() {
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384 debug_only(_oop_recorder->oop_size()); // mark it "frozen" for asserts
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385 return _stream->position();
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386 }
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387
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388
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389 int DebugInformationRecorder::pcs_size() {
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390 debug_only(_oop_recorder->oop_size()); // mark it "frozen" for asserts
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391 if (last_pc()->pc_offset() != PcDesc::upper_offset_limit)
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392 add_new_pc_offset(PcDesc::upper_offset_limit);
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393 return _pcs_length * sizeof(PcDesc);
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394 }
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395
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396
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397 void DebugInformationRecorder::copy_to(nmethod* nm) {
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398 nm->copy_scopes_data(stream()->buffer(), stream()->position());
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399 nm->copy_scopes_pcs(_pcs, _pcs_length);
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400 }
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401
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402
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403 void DebugInformationRecorder::verify(const nmethod* code) {
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404 Unimplemented();
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405 }
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406
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407 #ifndef PRODUCT
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408 void DebugInformationRecorder::print_statistics() {
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409 dir_stats.print();
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410 }
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411 #endif //PRODUCT
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