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1 /*
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2 * Copyright 2003-2006 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 #ifndef _JAVA_JVMTITHREADSTATE_H_
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26 #define _JAVA_JVMTITHREADSTATE_H_
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27
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28 //
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29 // Forward Declarations
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30 //
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31
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32 class JvmtiEnvBase;
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33 class JvmtiEnvThreadState;
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34 class JvmtiDynamicCodeEventCollector;
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35
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36 enum JvmtiClassLoadKind {
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37 jvmti_class_load_kind_load = 100,
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38 jvmti_class_load_kind_retransform,
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39 jvmti_class_load_kind_redefine
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40 };
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41
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42 ///////////////////////////////////////////////////////////////
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43 //
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44 // class JvmtiEnvThreadStateIterator
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45 //
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46 // The only safe means of iterating through the JvmtiEnvThreadStates
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47 // in a JvmtiThreadState.
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48 // Note that this iteratation includes invalid environments pending
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49 // deallocation -- in fact, some uses depend on this behavior.
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50 //
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51 class JvmtiEnvThreadStateIterator : public StackObj {
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52 private:
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53 JvmtiThreadState* state;
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54 public:
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55 JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state);
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56 ~JvmtiEnvThreadStateIterator();
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57 JvmtiEnvThreadState* first();
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58 JvmtiEnvThreadState* next(JvmtiEnvThreadState* ets);
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59 };
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60
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61
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62 ///////////////////////////////////////////////////////////////
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63 //
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64 // class JvmtiThreadState
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65 //
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66 // The Jvmti state for each thread (across all JvmtiEnv):
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67 // 1. Local table of enabled events.
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68 class JvmtiThreadState : public CHeapObj {
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69 private:
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70 friend class JvmtiEnv;
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71 JavaThread *_thread;
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72 bool _exception_detected;
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73 bool _exception_caught;
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74 bool _hide_single_stepping;
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75 bool _pending_step_for_popframe;
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76 bool _pending_step_for_earlyret;
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77 int _hide_level;
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78
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79 // Used to send class being redefined/retransformed and kind of transform
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80 // info to the class file load hook event handler.
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81 KlassHandle *_class_being_redefined;
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82 JvmtiClassLoadKind _class_load_kind;
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83
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84 // This is only valid when is_interp_only_mode() returns true
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85 int _cur_stack_depth;
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86
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87 JvmtiThreadEventEnable _thread_event_enable;
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88
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89 // for support of JvmtiEnvThreadState
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90 JvmtiEnvThreadState* _head_env_thread_state;
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91
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92 // doubly-linked linear list of active thread state
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93 // needed in order to iterate the list without holding Threads_lock
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94 static JvmtiThreadState *_head;
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95 JvmtiThreadState *_next;
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96 JvmtiThreadState *_prev;
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97
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98 // holds the current dynamic code event collector, NULL if no event collector in use
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99 JvmtiDynamicCodeEventCollector* _dynamic_code_event_collector;
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100 // holds the current vm object alloc event collector, NULL if no event collector in use
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101 JvmtiVMObjectAllocEventCollector* _vm_object_alloc_event_collector;
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102
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103 // Should only be created by factory methods
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104 JvmtiThreadState(JavaThread *thread);
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105
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106 friend class JvmtiEnvThreadStateIterator;
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107 inline JvmtiEnvThreadState* head_env_thread_state();
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108 inline void set_head_env_thread_state(JvmtiEnvThreadState* ets);
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109
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110 public:
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111 ~JvmtiThreadState();
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112
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113 // is event_type enabled and usable for this thread in any enviroments?
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114 bool is_enabled(jvmtiEvent event_type) {
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115 return _thread_event_enable.is_enabled(event_type);
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116 }
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117
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118 JvmtiThreadEventEnable *thread_event_enable() {
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119 return &_thread_event_enable;
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120 }
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121
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122 // Must only be called in situations where the state is for the current thread and
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123 // the environment can not go away. To be safe, the returned JvmtiEnvThreadState
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124 // must be used in such a way as there can be no intervening safepoints.
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125 inline JvmtiEnvThreadState* env_thread_state(JvmtiEnvBase *env);
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126
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127 static void periodic_clean_up();
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128
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129 void add_env(JvmtiEnvBase *env);
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130
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131 // Used by the interpreter for fullspeed debugging support
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132 bool is_interp_only_mode() { return _thread->is_interp_only_mode(); }
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133 void enter_interp_only_mode();
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134 void leave_interp_only_mode();
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135
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136 // access to the linked list of all JVMTI thread states
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137 static JvmtiThreadState *first() {
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138 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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139 return _head;
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140 }
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141
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142 JvmtiThreadState *next() {
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143 return _next;
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144 }
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145
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146 // Current stack depth is only valid when is_interp_only_mode() returns true.
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147 // These functions should only be called at a safepoint - usually called from same thread.
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148 // Returns the number of Java activations on the stack.
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149 int cur_stack_depth();
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150 void invalidate_cur_stack_depth();
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151 void incr_cur_stack_depth();
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152 void decr_cur_stack_depth();
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153
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154 int count_frames();
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155
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156 inline JavaThread *get_thread() { return _thread; }
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157 inline bool is_exception_detected() { return _exception_detected; }
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158 inline bool is_exception_caught() { return _exception_caught; }
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159 inline void set_exception_detected() { _exception_detected = true;
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160 _exception_caught = false; }
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161 inline void set_exception_caught() { _exception_caught = true;
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162 _exception_detected = false; }
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163
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164 inline void clear_hide_single_stepping() {
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165 if (_hide_level > 0) {
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166 _hide_level--;
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167 } else {
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168 assert(_hide_single_stepping, "hide_single_stepping is out of phase");
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169 _hide_single_stepping = false;
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170 }
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171 }
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172 inline bool hide_single_stepping() { return _hide_single_stepping; }
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173 inline void set_hide_single_stepping() {
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174 if (_hide_single_stepping) {
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175 _hide_level++;
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176 } else {
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177 assert(_hide_level == 0, "hide_level is out of phase");
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178 _hide_single_stepping = true;
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179 }
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180 }
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181
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182 // Step pending flag is set when PopFrame is called and it is cleared
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183 // when step for the Pop Frame is completed.
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184 // This logic is used to distinguish b/w step for pop frame and repeat step.
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185 void set_pending_step_for_popframe() { _pending_step_for_popframe = true; }
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186 void clr_pending_step_for_popframe() { _pending_step_for_popframe = false; }
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187 bool is_pending_step_for_popframe() { return _pending_step_for_popframe; }
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188 void process_pending_step_for_popframe();
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189
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190 // Step pending flag is set when ForceEarlyReturn is called and it is cleared
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191 // when step for the ForceEarlyReturn is completed.
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192 // This logic is used to distinguish b/w step for early return and repeat step.
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193 void set_pending_step_for_earlyret() { _pending_step_for_earlyret = true; }
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194 void clr_pending_step_for_earlyret() { _pending_step_for_earlyret = false; }
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195 bool is_pending_step_for_earlyret() { return _pending_step_for_earlyret; }
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196 void process_pending_step_for_earlyret();
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197
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198 // Setter and getter method is used to send redefined class info
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199 // when class file load hook event is posted.
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200 // It is set while loading redefined class and cleared before the
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201 // class file load hook event is posted.
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202 inline void set_class_being_redefined(KlassHandle *h_class, JvmtiClassLoadKind kind) {
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203 _class_being_redefined = h_class;
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204 _class_load_kind = kind;
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205 }
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206
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207 inline void clear_class_being_redefined() {
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208 _class_being_redefined = NULL;
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209 _class_load_kind = jvmti_class_load_kind_load;
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210 }
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211
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212 inline KlassHandle *get_class_being_redefined() {
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213 return _class_being_redefined;
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214 }
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215
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216 inline JvmtiClassLoadKind get_class_load_kind() {
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217 return _class_load_kind;
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218 }
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219
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220 // RedefineClasses support
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221 // The bug 6214132 caused the verification to fail.
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222 //
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223 // Below is the detailed description of the fix approach taken:
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224 // 1. What's done in RedefineClasses() before verification:
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225 // a) A reference to the class being redefined (_the_class) and a
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226 // reference to new version of the class (_scratch_class) are
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227 // saved here for use during the bytecode verification phase of
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228 // RedefineClasses. See RedefineVerifyMark for how these fields
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229 // are managed.
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230 // b) The _java_mirror field from _the_class is copied to the
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231 // _java_mirror field in _scratch_class. This means that a jclass
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232 // returned for _the_class or _scratch_class will refer to the
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233 // same Java mirror. The verifier will see the "one true mirror"
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234 // for the class being verified.
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235 // 2. What is done at verification:
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236 // When the verifier makes calls into the VM to ask questions about
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237 // the class being verified, it will pass the jclass to JVM_* functions.
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238 // The jclass is always pointing to the mirror of _the_class.
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239 // ~28 JVM_* functions called by the verifier for the information
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240 // about CP entries and klass structure should check the jvmtiThreadState
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241 // info about equivalent klass versions and use it to replace a klassOop
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242 // of _the_class with a klassOop of _scratch_class. The function
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243 // class_to_verify_considering_redefinition() must be called for it.
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244 //
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245 // Note again, that this redirection happens only for the verifier thread.
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246 // Other threads have very small overhead by checking the existence
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247 // of the jvmtiThreadSate and the information about klasses equivalence.
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248 // No JNI functions need to be changed, they don't reference the klass guts.
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249 // The JavaThread pointer is already available in all JVM_* functions
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250 // used by the verifier, so there is no extra performance issue with it.
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251
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252 private:
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253 KlassHandle *_the_class_for_redefinition_verification;
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254 KlassHandle *_scratch_class_for_redefinition_verification;
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255
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256 public:
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257 inline void set_class_versions_map(KlassHandle *the_class,
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258 KlassHandle *scratch_class) {
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259 _the_class_for_redefinition_verification = the_class;
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260 _scratch_class_for_redefinition_verification = scratch_class;
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261 }
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262
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263 inline void clear_class_versions_map() { set_class_versions_map(NULL, NULL); }
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264
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265 static inline
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266 klassOop class_to_verify_considering_redefinition(klassOop klass,
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267 JavaThread *thread) {
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268 JvmtiThreadState *state = thread->jvmti_thread_state();
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269 if (state != NULL && state->_the_class_for_redefinition_verification != NULL) {
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270 if ((*(state->_the_class_for_redefinition_verification))() == klass) {
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271 klass = (*(state->_scratch_class_for_redefinition_verification))();
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272 }
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273 }
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274 return klass;
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275 }
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276
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277 // Todo: get rid of this!
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278 private:
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279 bool _debuggable;
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280 public:
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281 // Should the thread be enumerated by jvmtiInternal::GetAllThreads?
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282 bool is_debuggable() { return _debuggable; }
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283 // If a thread cannot be suspended (has no valid last_java_frame) then it gets marked !debuggable
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284 void set_debuggable(bool debuggable) { _debuggable = debuggable; }
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285
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286 public:
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287
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288 bool may_be_walked();
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289
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290 // Thread local event collector setter and getter methods.
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291 JvmtiDynamicCodeEventCollector* get_dynamic_code_event_collector() {
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292 return _dynamic_code_event_collector;
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293 }
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294 JvmtiVMObjectAllocEventCollector* get_vm_object_alloc_event_collector() {
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295 return _vm_object_alloc_event_collector;
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296 }
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297 void set_dynamic_code_event_collector(JvmtiDynamicCodeEventCollector* collector) {
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298 _dynamic_code_event_collector = collector;
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299 }
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300 void set_vm_object_alloc_event_collector(JvmtiVMObjectAllocEventCollector* collector) {
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301 _vm_object_alloc_event_collector = collector;
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302 }
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303
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304
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305 //
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306 // Frame routines
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307 //
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308
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309 public:
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310
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311 // true when the thread was suspended with a pointer to the last Java frame.
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312 bool has_last_frame() { return _thread->has_last_Java_frame(); }
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313
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314 void update_for_pop_top_frame();
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315
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316 // already holding JvmtiThreadState_lock - retrieve or create JvmtiThreadState
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317 inline static JvmtiThreadState *state_for_while_locked(JavaThread *thread) {
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318 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
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319
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320 JvmtiThreadState *state = thread->jvmti_thread_state();
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321 if (state == NULL) {
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322 state = new JvmtiThreadState(thread);
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323 }
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324 return state;
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325 }
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326
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327 // retrieve or create JvmtiThreadState
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328 inline static JvmtiThreadState *state_for(JavaThread *thread) {
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329 JvmtiThreadState *state = thread->jvmti_thread_state();
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330 if (state == NULL) {
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331 MutexLocker mu(JvmtiThreadState_lock);
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332 // check again with the lock held
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333 state = state_for_while_locked(thread);
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334 } else {
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335 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
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336 }
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337 return state;
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338 }
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339
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340 // JVMTI ForceEarlyReturn support
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341
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342 // This is set to earlyret_pending to signal that top Java frame
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343 // should be returned immediately
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344 public:
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345 int _earlyret_state;
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346 TosState _earlyret_tos;
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347 jvalue _earlyret_value;
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348 oop _earlyret_oop; // Used to return an oop result into Java code from
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349 // ForceEarlyReturnObject, GC-preserved
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350
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351 // Setting and clearing earlyret_state
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352 // earlyret_pending indicates that a ForceEarlyReturn() has been
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353 // requested and not yet been completed.
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354 public:
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355 enum EarlyretState {
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356 earlyret_inactive = 0,
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357 earlyret_pending = 1
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358 };
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359
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360 void set_earlyret_pending(void) { _earlyret_state = earlyret_pending; }
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361 void clr_earlyret_pending(void) { _earlyret_state = earlyret_inactive; }
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362 bool is_earlyret_pending(void) { return (_earlyret_state == earlyret_pending); }
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363
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364 TosState earlyret_tos() { return _earlyret_tos; }
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365 oop earlyret_oop() const { return _earlyret_oop; }
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366 void set_earlyret_oop (oop x) { _earlyret_oop = x; }
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367 jvalue earlyret_value() { return _earlyret_value; }
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368 void set_earlyret_value(jvalue val, TosState tos) { _earlyret_tos = tos; _earlyret_value = val; }
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369 void clr_earlyret_value() { _earlyret_tos = ilgl; _earlyret_value.j = 0L; }
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370
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371 static ByteSize earlyret_state_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_state); }
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372 static ByteSize earlyret_tos_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_tos); }
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373 static ByteSize earlyret_oop_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_oop); }
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374 static ByteSize earlyret_value_offset() { return byte_offset_of(JvmtiThreadState, _earlyret_value); }
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375
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376 void oops_do(OopClosure* f); // GC support
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377 };
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378
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379 class RedefineVerifyMark : public StackObj {
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380 private:
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381 JvmtiThreadState *_state;
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382
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383 public:
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384 RedefineVerifyMark(KlassHandle *the_class, KlassHandle *scratch_class,
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385 JvmtiThreadState *state) : _state(state)
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386 {
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387 _state->set_class_versions_map(the_class, scratch_class);
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388 (*scratch_class)->set_java_mirror((*the_class)->java_mirror());
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389 }
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390
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391 ~RedefineVerifyMark() {
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392 _state->clear_class_versions_map();
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393 }
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394 };
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395
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396 #endif /* _JAVA_JVMTITHREADSTATE_H_ */
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