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1 /*
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2 * Copyright 1997-2006 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 // The following classes are C++ `closures` for iterating over objects, roots and spaces
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26
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27 class ReferenceProcessor;
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28
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29 // OopClosure is used for iterating through roots (oop*)
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30
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31 class OopClosure : public StackObj {
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32 public:
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33 ReferenceProcessor* _ref_processor;
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34 OopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { }
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35 OopClosure() : _ref_processor(NULL) { }
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36 virtual void do_oop(oop* o) = 0;
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37 virtual void do_oop_v(oop* o) { do_oop(o); }
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38
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39 // In support of post-processing of weak links of KlassKlass objects;
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40 // see KlassKlass::oop_oop_iterate().
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41 virtual const bool should_remember_klasses() const { return false; }
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42 virtual void remember_klass(Klass* k) { /* do nothing */ }
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43
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44 // If "true", invoke on nmethods (when scanning compiled frames).
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45 virtual const bool do_nmethods() const { return false; }
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46
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47 // The methods below control how object iterations invoking this closure
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48 // should be performed:
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49
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50 // If "true", invoke on header klass field.
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51 bool do_header() { return true; } // Note that this is non-virtual.
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52 // Controls how prefetching is done for invocations of this closure.
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53 Prefetch::style prefetch_style() { // Note that this is non-virtual.
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54 return Prefetch::do_none;
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55 }
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56 };
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57
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58 // ObjectClosure is used for iterating through an object space
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59
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60 class ObjectClosure : public StackObj {
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61 public:
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62 // Called for each object.
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63 virtual void do_object(oop obj) = 0;
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64 };
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65
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66
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67 class BoolObjectClosure : public ObjectClosure {
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68 public:
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69 virtual bool do_object_b(oop obj) = 0;
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70 };
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71
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72 // Applies an oop closure to all ref fields in objects iterated over in an
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73 // object iteration.
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74 class ObjectToOopClosure: public ObjectClosure {
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75 OopClosure* _cl;
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76 public:
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77 void do_object(oop obj);
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78 ObjectToOopClosure(OopClosure* cl) : _cl(cl) {}
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79 };
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80
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81 // A version of ObjectClosure with "memory" (see _previous_address below)
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82 class UpwardsObjectClosure: public BoolObjectClosure {
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83 HeapWord* _previous_address;
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84 public:
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85 UpwardsObjectClosure() : _previous_address(NULL) { }
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86 void set_previous(HeapWord* addr) { _previous_address = addr; }
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87 HeapWord* previous() { return _previous_address; }
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88 // A return value of "true" can be used by the caller to decide
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89 // if this object's end should *NOT* be recorded in
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90 // _previous_address above.
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91 virtual bool do_object_bm(oop obj, MemRegion mr) = 0;
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92 };
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93
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94 // A version of ObjectClosure that is expected to be robust
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95 // in the face of possibly uninitialized objects.
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96 class ObjectClosureCareful : public ObjectClosure {
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97 public:
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98 virtual size_t do_object_careful_m(oop p, MemRegion mr) = 0;
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99 virtual size_t do_object_careful(oop p) = 0;
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100 };
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101
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102 // The following are used in CompactibleFreeListSpace and
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103 // ConcurrentMarkSweepGeneration.
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104
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105 // Blk closure (abstract class)
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106 class BlkClosure : public StackObj {
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107 public:
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108 virtual size_t do_blk(HeapWord* addr) = 0;
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109 };
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110
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111 // A version of BlkClosure that is expected to be robust
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112 // in the face of possibly uninitialized objects.
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113 class BlkClosureCareful : public BlkClosure {
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114 public:
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115 size_t do_blk(HeapWord* addr) {
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116 guarantee(false, "call do_blk_careful instead");
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117 return 0;
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118 }
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119 virtual size_t do_blk_careful(HeapWord* addr) = 0;
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120 };
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121
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122 // SpaceClosure is used for iterating over spaces
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123
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124 class Space;
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125 class CompactibleSpace;
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126
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127 class SpaceClosure : public StackObj {
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128 public:
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129 // Called for each space
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130 virtual void do_space(Space* s) = 0;
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131 };
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132
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133 class CompactibleSpaceClosure : public StackObj {
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134 public:
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135 // Called for each compactible space
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136 virtual void do_space(CompactibleSpace* s) = 0;
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137 };
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138
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139
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140
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141 // MonitorClosure is used for iterating over monitors in the monitors cache
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142
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143 class ObjectMonitor;
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144
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145 class MonitorClosure : public StackObj {
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146 public:
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147 // called for each monitor in cache
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148 virtual void do_monitor(ObjectMonitor* m) = 0;
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149 };
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150
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151 // A closure that is applied without any arguments.
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152 class VoidClosure : public StackObj {
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153 public:
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154 // I would have liked to declare this a pure virtual, but that breaks
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155 // in mysterious ways, for unknown reasons.
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156 virtual void do_void();
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157 };
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158
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159
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160 // YieldClosure is intended for use by iteration loops
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161 // to incrementalize their work, allowing interleaving
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162 // of an interruptable task so as to allow other
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163 // threads to run (which may not otherwise be able to access
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164 // exclusive resources, for instance). Additionally, the
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165 // closure also allows for aborting an ongoing iteration
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166 // by means of checking the return value from the polling
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167 // call.
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168 class YieldClosure : public StackObj {
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169 public:
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170 virtual bool should_return() = 0;
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171 };
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172
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173 // Abstract closure for serializing data (read or write).
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174
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175 class SerializeOopClosure : public OopClosure {
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176 public:
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177 // Return bool indicating whether closure implements read or write.
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178 virtual bool reading() const = 0;
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179
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180 // Read/write the int pointed to by i.
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181 virtual void do_int(int* i) = 0;
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182
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183 // Read/write the size_t pointed to by i.
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184 virtual void do_size_t(size_t* i) = 0;
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185
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186 // Read/write the void pointer pointed to by p.
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187 virtual void do_ptr(void** p) = 0;
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188
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189 // Read/write the HeapWord pointer pointed to be p.
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190 virtual void do_ptr(HeapWord** p) = 0;
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191
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192 // Read/write the region specified.
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193 virtual void do_region(u_char* start, size_t size) = 0;
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194
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195 // Check/write the tag. If reading, then compare the tag against
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196 // the passed in value and fail is they don't match. This allows
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197 // for verification that sections of the serialized data are of the
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198 // correct length.
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199 virtual void do_tag(int tag) = 0;
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200 };
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