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1 /*
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2 * Copyright 1997-2003 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/_handles.cpp.incl"
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27
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28 #ifdef ASSERT
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29 oop* HandleArea::allocate_handle(oop obj) {
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30 assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark");
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31 assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark");
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32 assert(SharedSkipVerify || obj->is_oop(), "sanity check");
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33 return real_allocate_handle(obj);
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34 }
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35
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36 Handle::Handle(Thread* thread, oop obj) {
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37 assert(thread == Thread::current(), "sanity check");
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38 if (obj == NULL) {
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39 _handle = NULL;
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40 } else {
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41 _handle = thread->handle_area()->allocate_handle(obj);
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42 }
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43 }
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44
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45 #endif
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46
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47 static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) {
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48 oop* bottom = (oop*) chunk->bottom();
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49 oop* top = (oop*) chunk_top;
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50 uintx handles_visited = top - bottom;
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51 assert(top >= bottom && top <= (oop*) chunk->top(), "just checking");
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52 // during GC phase 3, a handle may be a forward pointer that
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53 // is not yet valid, so loosen the assertion
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54 while (bottom < top) {
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55 // assert((*bottom)->is_oop(), "handle should point to oop");
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56 assert(Universe::heap()->is_in(*bottom), "handle should be valid heap address");
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57 f->do_oop(bottom++);
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58 }
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59 return handles_visited;
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60 }
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61
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62 // Used for debugging handle allocation.
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63 NOT_PRODUCT(jint _nof_handlemarks = 0;)
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64
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65 void HandleArea::oops_do(OopClosure* f) {
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66 uintx handles_visited = 0;
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67 // First handle the current chunk. It is filled to the high water mark.
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68 handles_visited += chunk_oops_do(f, _chunk, _hwm);
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69 // Then handle all previous chunks. They are completely filled.
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70 Chunk* k = _first;
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71 while(k != _chunk) {
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72 handles_visited += chunk_oops_do(f, k, k->top());
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73 k = k->next();
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74 }
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75
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76 // The thread local handle areas should not get very large
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77 if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) {
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78 #ifdef ASSERT
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79 warning("%d: Visited in HandleMark : %d",
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80 _nof_handlemarks, handles_visited);
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81 #else
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82 warning("Visited in HandleMark : %d", handles_visited);
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83 #endif
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84 }
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85 if (_prev != NULL) _prev->oops_do(f);
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86 }
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87
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88 void HandleMark::initialize(Thread* thread) {
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89 _thread = thread;
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90 // Save area
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91 _area = thread->handle_area();
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92 // Save current top
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93 _chunk = _area->_chunk;
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94 _hwm = _area->_hwm;
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95 _max = _area->_max;
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96 NOT_PRODUCT(_size_in_bytes = _area->_size_in_bytes;)
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97 debug_only(_area->_handle_mark_nesting++);
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98 assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks");
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99 debug_only(Atomic::inc(&_nof_handlemarks);)
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100
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101 // Link this in the thread
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102 set_previous_handle_mark(thread->last_handle_mark());
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103 thread->set_last_handle_mark(this);
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104 }
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105
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106
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107 HandleMark::~HandleMark() {
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108 HandleArea* area = _area; // help compilers with poor alias analysis
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109 assert(area == _thread->handle_area(), "sanity check");
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110 assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" );
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111 debug_only(area->_handle_mark_nesting--);
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112
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113 // Debug code to trace the number of handles allocated per mark/
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114 #ifdef ASSERT
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115 if (TraceHandleAllocation) {
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116 size_t handles = 0;
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117 Chunk *c = _chunk->next();
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118 if (c == NULL) {
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119 handles = area->_hwm - _hwm; // no new chunk allocated
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120 } else {
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121 handles = _max - _hwm; // add rest in first chunk
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122 while(c != NULL) {
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123 handles += c->length();
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124 c = c->next();
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125 }
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126 handles -= area->_max - area->_hwm; // adjust for last trunk not full
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127 }
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128 handles /= sizeof(void *); // Adjust for size of a handle
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129 if (handles > HandleAllocationLimit) {
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130 // Note: _nof_handlemarks is only set in debug mode
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131 warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles);
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132 }
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133 }
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134 #endif
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135
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136 // Delete later chunks
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137 if( _chunk->next() ) {
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138 _chunk->next_chop();
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139 }
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140 // Roll back arena to saved top markers
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141 area->_chunk = _chunk;
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142 area->_hwm = _hwm;
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143 area->_max = _max;
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144 NOT_PRODUCT(area->set_size_in_bytes(_size_in_bytes);)
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145 #ifdef ASSERT
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146 // clear out first chunk (to detect allocation bugs)
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147 if (ZapVMHandleArea) {
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148 memset(_hwm, badHandleValue, _max - _hwm);
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149 }
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150 Atomic::dec(&_nof_handlemarks);
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151 #endif
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152
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153 // Unlink this from the thread
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154 _thread->set_last_handle_mark(previous_handle_mark());
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155 }
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156
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157 #ifdef ASSERT
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158
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159 NoHandleMark::NoHandleMark() {
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160 HandleArea* area = Thread::current()->handle_area();
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161 area->_no_handle_mark_nesting++;
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162 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
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163 }
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164
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165
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166 NoHandleMark::~NoHandleMark() {
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167 HandleArea* area = Thread::current()->handle_area();
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168 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
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169 area->_no_handle_mark_nesting--;
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170 }
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171
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172
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173 ResetNoHandleMark::ResetNoHandleMark() {
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174 HandleArea* area = Thread::current()->handle_area();
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175 _no_handle_mark_nesting = area->_no_handle_mark_nesting;
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176 area->_no_handle_mark_nesting = 0;
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177 }
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178
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179
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180 ResetNoHandleMark::~ResetNoHandleMark() {
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181 HandleArea* area = Thread::current()->handle_area();
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182 area->_no_handle_mark_nesting = _no_handle_mark_nesting;
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183 }
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184
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185 #endif
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