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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 # include "incls/_precompiled.incl"
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26 # include "incls/_jvmtiThreadState.cpp.incl"
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27
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28 // marker for when the stack depth has been reset and is now unknown.
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29 // any negative number would work but small ones might obscure an
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30 // underrun error.
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31 static const int UNKNOWN_STACK_DEPTH = -99;
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32
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33 ///////////////////////////////////////////////////////////////
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34 //
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35 // class JvmtiThreadState
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36 //
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37 // Instances of JvmtiThreadState hang off of each thread.
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38 // Thread local storage for JVMTI.
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39 //
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40
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41 JvmtiThreadState *JvmtiThreadState::_head = NULL;
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42
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43 JvmtiThreadState::JvmtiThreadState(JavaThread* thread)
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44 : _thread_event_enable() {
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45 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
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46 _thread = thread;
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47 _exception_detected = false;
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48 _exception_caught = false;
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49 _debuggable = true;
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50 _hide_single_stepping = false;
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51 _hide_level = 0;
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52 _pending_step_for_popframe = false;
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53 _class_being_redefined = NULL;
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54 _class_load_kind = jvmti_class_load_kind_load;
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55 _head_env_thread_state = NULL;
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56 _dynamic_code_event_collector = NULL;
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57 _vm_object_alloc_event_collector = NULL;
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58 _the_class_for_redefinition_verification = NULL;
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59 _scratch_class_for_redefinition_verification = NULL;
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60
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61 // JVMTI ForceEarlyReturn support
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62 _pending_step_for_earlyret = false;
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63 _earlyret_state = earlyret_inactive;
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64 _earlyret_tos = ilgl;
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65 _earlyret_value.j = 0L;
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66 _earlyret_oop = NULL;
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67
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68 // add all the JvmtiEnvThreadState to the new JvmtiThreadState
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69 {
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70 JvmtiEnvIterator it;
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71 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
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72 if (env->is_valid()) {
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73 add_env(env);
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74 }
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75 }
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76 }
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77
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78 // link us into the list
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79 {
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80 // The thread state list manipulation code must not have safepoints.
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81 // See periodic_clean_up().
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82 debug_only(No_Safepoint_Verifier nosafepoint;)
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83
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84 _prev = NULL;
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85 _next = _head;
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86 if (_head != NULL) {
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87 _head->_prev = this;
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88 }
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89 _head = this;
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90 }
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91
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92 // set this as the state for the thread
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93 thread->set_jvmti_thread_state(this);
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94 }
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95
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96
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97 JvmtiThreadState::~JvmtiThreadState() {
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98 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
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99
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100 // clear this as the state for the thread
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101 get_thread()->set_jvmti_thread_state(NULL);
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102
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103 // zap our env thread states
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104 {
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105 JvmtiEnvBase::entering_dying_thread_env_iteration();
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106 JvmtiEnvThreadStateIterator it(this);
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107 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ) {
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108 JvmtiEnvThreadState* zap = ets;
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109 ets = it.next(ets);
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110 delete zap;
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111 }
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112 JvmtiEnvBase::leaving_dying_thread_env_iteration();
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113 }
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114
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115 // remove us from the list
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116 {
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117 // The thread state list manipulation code must not have safepoints.
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118 // See periodic_clean_up().
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119 debug_only(No_Safepoint_Verifier nosafepoint;)
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120
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121 if (_prev == NULL) {
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122 assert(_head == this, "sanity check");
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123 _head = _next;
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124 } else {
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125 assert(_head != this, "sanity check");
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126 _prev->_next = _next;
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127 }
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128 if (_next != NULL) {
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129 _next->_prev = _prev;
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130 }
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131 _next = NULL;
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132 _prev = NULL;
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133 }
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134 }
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135
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136
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137 void
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138 JvmtiThreadState::periodic_clean_up() {
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139 assert(SafepointSynchronize::is_at_safepoint(), "at safepoint");
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140
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141 // This iteration is initialized with "_head" instead of "JvmtiThreadState::first()"
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142 // because the latter requires the JvmtiThreadState_lock.
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143 // This iteration is safe at a safepoint as well, see the No_Safepoint_Verifier
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144 // asserts at all list manipulation sites.
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145 for (JvmtiThreadState *state = _head; state != NULL; state = state->next()) {
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146 // For each environment thread state corresponding to an invalid environment
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147 // unlink it from the list and deallocate it.
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148 JvmtiEnvThreadStateIterator it(state);
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149 JvmtiEnvThreadState* previous_ets = NULL;
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150 JvmtiEnvThreadState* ets = it.first();
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151 while (ets != NULL) {
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152 if (ets->get_env()->is_valid()) {
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153 previous_ets = ets;
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154 ets = it.next(ets);
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155 } else {
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156 // This one isn't valid, remove it from the list and deallocate it
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157 JvmtiEnvThreadState* defunct_ets = ets;
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158 ets = ets->next();
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159 if (previous_ets == NULL) {
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160 assert(state->head_env_thread_state() == defunct_ets, "sanity check");
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161 state->set_head_env_thread_state(ets);
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162 } else {
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163 previous_ets->set_next(ets);
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164 }
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165 delete defunct_ets;
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166 }
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167 }
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168 }
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169 }
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170
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171 void JvmtiThreadState::add_env(JvmtiEnvBase *env) {
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172 assert(JvmtiThreadState_lock->is_locked(), "sanity check");
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173
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174 JvmtiEnvThreadState *new_ets = new JvmtiEnvThreadState(_thread, env);
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175 // add this environment thread state to the end of the list (order is important)
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176 {
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177 // list deallocation (which occurs at a safepoint) cannot occur simultaneously
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178 debug_only(No_Safepoint_Verifier nosafepoint;)
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179
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180 JvmtiEnvThreadStateIterator it(this);
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181 JvmtiEnvThreadState* previous_ets = NULL;
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182 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
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183 previous_ets = ets;
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184 }
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185 if (previous_ets == NULL) {
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186 set_head_env_thread_state(new_ets);
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187 } else {
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188 previous_ets->set_next(new_ets);
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189 }
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190 }
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191 }
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192
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193
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194
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195
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196 void JvmtiThreadState::enter_interp_only_mode() {
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197 assert(_thread->get_interp_only_mode() == 0, "entering interp only when mode not zero");
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198 _thread->increment_interp_only_mode();
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199 }
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200
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201
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202 void JvmtiThreadState::leave_interp_only_mode() {
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203 assert(_thread->get_interp_only_mode() == 1, "leaving interp only when mode not one");
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204 _thread->decrement_interp_only_mode();
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205 }
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206
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207
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208 // Helper routine used in several places
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209 int JvmtiThreadState::count_frames() {
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210 #ifdef ASSERT
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211 uint32_t debug_bits = 0;
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212 #endif
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213 assert(SafepointSynchronize::is_at_safepoint() ||
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214 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits),
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215 "at safepoint or must be suspended");
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216
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217 if (!get_thread()->has_last_Java_frame()) return 0; // no Java frames
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218
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219 ResourceMark rm;
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220 RegisterMap reg_map(get_thread());
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221 javaVFrame *jvf = get_thread()->last_java_vframe(®_map);
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222 int n = 0;
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223 // tty->print_cr("CSD: counting frames on %s ...",
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224 // JvmtiTrace::safe_get_thread_name(get_thread()));
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225 while (jvf != NULL) {
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226 methodOop method = jvf->method();
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227 // tty->print_cr("CSD: frame - method %s.%s - loc %d",
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228 // method->klass_name()->as_C_string(),
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229 // method->name()->as_C_string(),
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230 // jvf->bci() );
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231 jvf = jvf->java_sender();
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232 n++;
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233 }
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234 // tty->print_cr("CSD: frame count: %d", n);
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235 return n;
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236 }
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237
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238
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239 void JvmtiThreadState::invalidate_cur_stack_depth() {
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240 Thread *cur = Thread::current();
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241 uint32_t debug_bits = 0;
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242
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243 // The caller can be the VMThread at a safepoint, the current thread
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244 // or the target thread must be suspended.
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245 guarantee((cur->is_VM_thread() && SafepointSynchronize::is_at_safepoint()) ||
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246 (JavaThread *)cur == get_thread() ||
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247 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits),
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248 "sanity check");
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249
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250 _cur_stack_depth = UNKNOWN_STACK_DEPTH;
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251 }
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252
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253 void JvmtiThreadState::incr_cur_stack_depth() {
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254 guarantee(JavaThread::current() == get_thread(), "must be current thread");
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255
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256 if (!is_interp_only_mode()) {
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257 _cur_stack_depth = UNKNOWN_STACK_DEPTH;
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258 }
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259 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) {
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260 ++_cur_stack_depth;
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261 }
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262 }
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263
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264 void JvmtiThreadState::decr_cur_stack_depth() {
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265 guarantee(JavaThread::current() == get_thread(), "must be current thread");
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266
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267 if (!is_interp_only_mode()) {
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268 _cur_stack_depth = UNKNOWN_STACK_DEPTH;
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269 }
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270 if (_cur_stack_depth != UNKNOWN_STACK_DEPTH) {
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271 --_cur_stack_depth;
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272 assert(_cur_stack_depth >= 0, "incr/decr_cur_stack_depth mismatch");
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273 }
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274 }
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275
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276 int JvmtiThreadState::cur_stack_depth() {
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277 uint32_t debug_bits = 0;
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278 guarantee(JavaThread::current() == get_thread() ||
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279 JvmtiEnv::is_thread_fully_suspended(get_thread(), false, &debug_bits),
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280 "must be current thread or suspended");
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281
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282 if (!is_interp_only_mode() || _cur_stack_depth == UNKNOWN_STACK_DEPTH) {
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283 _cur_stack_depth = count_frames();
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284 } else {
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285 // heavy weight assert
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286 assert(_cur_stack_depth == count_frames(),
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287 "cur_stack_depth out of sync");
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288 }
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289 return _cur_stack_depth;
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290 }
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291
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292 bool JvmtiThreadState::may_be_walked() {
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293 return (get_thread()->is_being_ext_suspended() || (JavaThread::current() == get_thread()));
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294 }
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295
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296
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297 void JvmtiThreadState::process_pending_step_for_popframe() {
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298 // We are single stepping as the last part of the PopFrame() dance
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299 // so we have some house keeping to do.
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300
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301 JavaThread *thr = get_thread();
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302 if (thr->popframe_condition() != JavaThread::popframe_inactive) {
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303 // If the popframe_condition field is not popframe_inactive, then
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304 // we missed all of the popframe_field cleanup points:
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305 //
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306 // - unpack_frames() was not called (nothing to deopt)
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307 // - remove_activation_preserving_args_entry() was not called
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308 // (did not get suspended in a call_vm() family call and did
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309 // not complete a call_vm() family call on the way here)
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310 thr->clear_popframe_condition();
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311 }
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312
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313 // clearing the flag indicates we are done with the PopFrame() dance
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314 clr_pending_step_for_popframe();
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315
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316 // If step is pending for popframe then it may not be
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317 // a repeat step. The new_bci and method_id is same as current_bci
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318 // and current method_id after pop and step for recursive calls.
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319 // Force the step by clearing the last location.
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320 JvmtiEnvThreadStateIterator it(this);
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321 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
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322 ets->clear_current_location();
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323 }
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324 }
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325
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326
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327 // Class: JvmtiThreadState
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328 // Function: update_for_pop_top_frame
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329 // Description:
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330 // This function removes any frame pop notification request for
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331 // the top frame and invalidates both the current stack depth and
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332 // all cached frameIDs.
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333 //
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334 // Called by: PopFrame
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335 //
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336 void JvmtiThreadState::update_for_pop_top_frame() {
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337 if (is_interp_only_mode()) {
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338 // remove any frame pop notification request for the top frame
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339 // in any environment
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340 int popframe_number = cur_stack_depth();
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341 {
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342 JvmtiEnvThreadStateIterator it(this);
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343 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
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344 if (ets->is_frame_pop(popframe_number)) {
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345 ets->clear_frame_pop(popframe_number);
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346 }
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347 }
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348 }
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349 // force stack depth to be recalculated
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350 invalidate_cur_stack_depth();
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351 } else {
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352 assert(!is_enabled(JVMTI_EVENT_FRAME_POP), "Must have no framepops set");
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353 }
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354 }
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355
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356
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357 void JvmtiThreadState::process_pending_step_for_earlyret() {
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358 // We are single stepping as the last part of the ForceEarlyReturn
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359 // dance so we have some house keeping to do.
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360
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361 if (is_earlyret_pending()) {
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362 // If the earlyret_state field is not earlyret_inactive, then
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363 // we missed all of the earlyret_field cleanup points:
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364 //
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365 // - remove_activation() was not called
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366 // (did not get suspended in a call_vm() family call and did
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367 // not complete a call_vm() family call on the way here)
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368 //
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369 // One legitimate way for us to miss all the cleanup points is
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370 // if we got here right after handling a compiled return. If that
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371 // is the case, then we consider our return from compiled code to
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372 // complete the ForceEarlyReturn request and we clear the condition.
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373 clr_earlyret_pending();
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374 set_earlyret_oop(NULL);
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375 clr_earlyret_value();
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376 }
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377
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378 // clearing the flag indicates we are done with
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379 // the ForceEarlyReturn() dance
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380 clr_pending_step_for_earlyret();
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381
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382 // If step is pending for earlyret then it may not be a repeat step.
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383 // The new_bci and method_id is same as current_bci and current
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384 // method_id after earlyret and step for recursive calls.
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385 // Force the step by clearing the last location.
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386 JvmtiEnvThreadStateIterator it(this);
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387 for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
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388 ets->clear_current_location();
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389 }
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390 }
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391
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392 void JvmtiThreadState::oops_do(OopClosure* f) {
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393 f->do_oop((oop*) &_earlyret_oop);
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394 }
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