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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 # include "incls/_precompiled.incl"
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25 # include "incls/_jvmtiManageCapabilities.cpp.incl"
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26
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27 static const jint CAPA_SIZE = (JVMTI_INTERNAL_CAPABILITY_COUNT + 7) / 8;
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28
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29 // capabilities which are always potentially available
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30 jvmtiCapabilities JvmtiManageCapabilities::always_capabilities;
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31
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32 // capabilities which are potentially available during OnLoad
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33 jvmtiCapabilities JvmtiManageCapabilities::onload_capabilities;
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34
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35 // capabilities which are always potentially available
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36 // but to only one environment
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37 jvmtiCapabilities JvmtiManageCapabilities::always_solo_capabilities;
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38
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39 // capabilities which are potentially available during OnLoad
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40 // but to only one environment
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41 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_capabilities;
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42
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43 // remaining capabilities which are always potentially available
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44 // but to only one environment
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45 jvmtiCapabilities JvmtiManageCapabilities::always_solo_remaining_capabilities;
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46
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47 // remaining capabilities which are potentially available during OnLoad
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48 // but to only one environment
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49 jvmtiCapabilities JvmtiManageCapabilities::onload_solo_remaining_capabilities;
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50
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51 // all capabilities ever acquired
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52 jvmtiCapabilities JvmtiManageCapabilities::acquired_capabilities;
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53
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54 void JvmtiManageCapabilities::initialize() {
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55 always_capabilities = init_always_capabilities();
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56 if (JvmtiEnv::get_phase() != JVMTI_PHASE_ONLOAD) {
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57 recompute_always_capabilities();
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58 }
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59 onload_capabilities = init_onload_capabilities();
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60 always_solo_capabilities = init_always_solo_capabilities();
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61 onload_solo_capabilities = init_onload_solo_capabilities();
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62 always_solo_remaining_capabilities = init_always_solo_capabilities();
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63 onload_solo_remaining_capabilities = init_onload_solo_capabilities();
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64 memset(&acquired_capabilities, 0, sizeof(acquired_capabilities));
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65 }
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66
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67 // if the capability sets are initialized in the onload phase then
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68 // it happens before class data sharing (CDS) is initialized. If it
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69 // turns out that CDS gets disabled then we must adjust the always
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70 // capabilities. To ensure a consistent view of the capabililties
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71 // anything we add here should already be in the onload set.
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72 void JvmtiManageCapabilities::recompute_always_capabilities() {
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73 if (!UseSharedSpaces) {
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74 jvmtiCapabilities jc = always_capabilities;
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75 jc.can_generate_all_class_hook_events = 1;
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76 always_capabilities = jc;
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77 }
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78 }
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79
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80
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81 // corresponding init functions
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82 jvmtiCapabilities JvmtiManageCapabilities::init_always_capabilities() {
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83 jvmtiCapabilities jc;
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84
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85 memset(&jc, 0, sizeof(jc));
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86 jc.can_get_bytecodes = 1;
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87 jc.can_signal_thread = 1;
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88 jc.can_get_source_file_name = 1;
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89 jc.can_get_line_numbers = 1;
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90 jc.can_get_synthetic_attribute = 1;
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91 jc.can_get_monitor_info = 1;
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92 jc.can_get_constant_pool = 1;
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93 jc.can_generate_monitor_events = 1;
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94 jc.can_generate_garbage_collection_events = 1;
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95 jc.can_generate_compiled_method_load_events = 1;
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96 jc.can_generate_native_method_bind_events = 1;
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97 jc.can_generate_vm_object_alloc_events = 1;
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98 if (os::is_thread_cpu_time_supported()) {
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99 jc.can_get_current_thread_cpu_time = 1;
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100 jc.can_get_thread_cpu_time = 1;
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101 }
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102 jc.can_redefine_classes = 1;
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103 jc.can_redefine_any_class = 1;
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104 jc.can_retransform_classes = 1;
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105 jc.can_retransform_any_class = 1;
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106 jc.can_set_native_method_prefix = 1;
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107 jc.can_tag_objects = 1;
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108 jc.can_generate_object_free_events = 1;
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109 jc.can_generate_resource_exhaustion_heap_events = 1;
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110 jc.can_generate_resource_exhaustion_threads_events = 1;
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111 return jc;
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112 }
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113
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114 jvmtiCapabilities JvmtiManageCapabilities::init_onload_capabilities() {
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115 jvmtiCapabilities jc;
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116
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117 memset(&jc, 0, sizeof(jc));
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118 jc.can_pop_frame = 1;
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119 jc.can_force_early_return = 1;
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120 jc.can_get_source_debug_extension = 1;
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121 jc.can_access_local_variables = 1;
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122 jc.can_maintain_original_method_order = 1;
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123 jc.can_generate_all_class_hook_events = 1;
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124 jc.can_generate_single_step_events = 1;
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125 jc.can_generate_exception_events = 1;
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126 jc.can_generate_frame_pop_events = 1;
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127 jc.can_generate_method_entry_events = 1;
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128 jc.can_generate_method_exit_events = 1;
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129 jc.can_get_owned_monitor_info = 1;
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130 jc.can_get_owned_monitor_stack_depth_info = 1;
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131 jc.can_get_current_contended_monitor = 1;
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132 // jc.can_get_monitor_info = 1;
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133 jc.can_tag_objects = 1; // TODO: this should have been removed
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134 jc.can_generate_object_free_events = 1; // TODO: this should have been removed
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135 return jc;
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136 }
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137
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138
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139 jvmtiCapabilities JvmtiManageCapabilities::init_always_solo_capabilities() {
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140 jvmtiCapabilities jc;
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141
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142 memset(&jc, 0, sizeof(jc));
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143 jc.can_suspend = 1;
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144 return jc;
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145 }
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146
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147
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148 jvmtiCapabilities JvmtiManageCapabilities::init_onload_solo_capabilities() {
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149 jvmtiCapabilities jc;
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150
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151 memset(&jc, 0, sizeof(jc));
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152 jc.can_generate_field_modification_events = 1;
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153 jc.can_generate_field_access_events = 1;
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154 jc.can_generate_breakpoint_events = 1;
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155 return jc;
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156 }
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157
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158
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159 jvmtiCapabilities *JvmtiManageCapabilities::either(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
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160 jvmtiCapabilities *result) {
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161 char *ap = (char *)a;
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162 char *bp = (char *)b;
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163 char *resultp = (char *)result;
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164
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165 for (int i = 0; i < CAPA_SIZE; ++i) {
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166 *resultp++ = *ap++ | *bp++;
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167 }
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168
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169 return result;
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170 }
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171
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172
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173 jvmtiCapabilities *JvmtiManageCapabilities::both(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
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174 jvmtiCapabilities *result) {
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175 char *ap = (char *)a;
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176 char *bp = (char *)b;
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177 char *resultp = (char *)result;
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178
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179 for (int i = 0; i < CAPA_SIZE; ++i) {
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180 *resultp++ = *ap++ & *bp++;
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181 }
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182
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183 return result;
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184 }
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185
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186
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187 jvmtiCapabilities *JvmtiManageCapabilities::exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b,
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188 jvmtiCapabilities *result) {
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189 char *ap = (char *)a;
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190 char *bp = (char *)b;
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191 char *resultp = (char *)result;
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192
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193 for (int i = 0; i < CAPA_SIZE; ++i) {
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194 *resultp++ = *ap++ & ~*bp++;
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195 }
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196
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197 return result;
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198 }
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199
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200
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201 bool JvmtiManageCapabilities::has_some(const jvmtiCapabilities *a) {
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202 char *ap = (char *)a;
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203
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204 for (int i = 0; i < CAPA_SIZE; ++i) {
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205 if (*ap++ != 0) {
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206 return true;
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207 }
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208 }
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209
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210 return false;
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211 }
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212
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213
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214 void JvmtiManageCapabilities::copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to) {
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215 char *ap = (char *)from;
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216 char *resultp = (char *)to;
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217
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218 for (int i = 0; i < CAPA_SIZE; ++i) {
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219 *resultp++ = *ap++;
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220 }
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221 }
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222
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223
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224 void JvmtiManageCapabilities::get_potential_capabilities(const jvmtiCapabilities *current,
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225 const jvmtiCapabilities *prohibited,
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226 jvmtiCapabilities *result) {
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227 // exclude prohibited capabilities, must be before adding current
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228 exclude(&always_capabilities, prohibited, result);
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229
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230 // must include current since it may possess solo capabilities and now prohibited
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231 either(result, current, result);
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232
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233 // add other remaining
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234 either(result, &always_solo_remaining_capabilities, result);
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235
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236 // if this is during OnLoad more capabilities are available
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237 if (JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
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238 either(result, &onload_capabilities, result);
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239 either(result, &onload_solo_remaining_capabilities, result);
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240 }
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241 }
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242
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243 jvmtiError JvmtiManageCapabilities::add_capabilities(const jvmtiCapabilities *current,
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244 const jvmtiCapabilities *prohibited,
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245 const jvmtiCapabilities *desired,
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246 jvmtiCapabilities *result) {
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247 // check that the capabilities being added are potential capabilities
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248 jvmtiCapabilities temp;
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249 get_potential_capabilities(current, prohibited, &temp);
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250 if (has_some(exclude(desired, &temp, &temp))) {
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251 return JVMTI_ERROR_NOT_AVAILABLE;
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252 }
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253
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254 // add to the set of ever acquired capabilities
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255 either(&acquired_capabilities, desired, &acquired_capabilities);
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256
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257 // onload capabilities that got added are now permanent - so, also remove from onload
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258 both(&onload_capabilities, desired, &temp);
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259 either(&always_capabilities, &temp, &always_capabilities);
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260 exclude(&onload_capabilities, &temp, &onload_capabilities);
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261
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262 // same for solo capabilities (transferred capabilities in the remaining sets handled as part of standard grab - below)
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263 both(&onload_solo_capabilities, desired, &temp);
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264 either(&always_solo_capabilities, &temp, &always_solo_capabilities);
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265 exclude(&onload_solo_capabilities, &temp, &onload_solo_capabilities);
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266
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267 // remove solo capabilities that are now taken
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268 exclude(&always_solo_remaining_capabilities, desired, &always_solo_remaining_capabilities);
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269 exclude(&onload_solo_remaining_capabilities, desired, &onload_solo_remaining_capabilities);
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270
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271 // return the result
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272 either(current, desired, result);
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273
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274 update();
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275
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276 return JVMTI_ERROR_NONE;
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277 }
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278
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279
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280 void JvmtiManageCapabilities::relinquish_capabilities(const jvmtiCapabilities *current,
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281 const jvmtiCapabilities *unwanted,
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282 jvmtiCapabilities *result) {
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283 jvmtiCapabilities to_trash;
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284 jvmtiCapabilities temp;
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285
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286 // can't give up what you don't have
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287 both(current, unwanted, &to_trash);
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288
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289 // restore solo capabilities but only those that belong
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290 either(&always_solo_remaining_capabilities, both(&always_solo_capabilities, &to_trash, &temp),
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291 &always_solo_remaining_capabilities);
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292 either(&onload_solo_remaining_capabilities, both(&onload_solo_capabilities, &to_trash, &temp),
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293 &onload_solo_remaining_capabilities);
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294
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295 update();
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296
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297 // return the result
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298 exclude(current, unwanted, result);
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299 }
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300
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301
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302 void JvmtiManageCapabilities::update() {
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303 jvmtiCapabilities avail;
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304
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305 // all capabilities
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306 either(&always_capabilities, &always_solo_capabilities, &avail);
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307
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308 bool interp_events =
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309 avail.can_generate_field_access_events ||
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310 avail.can_generate_field_modification_events ||
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311 avail.can_generate_single_step_events ||
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312 avail.can_generate_frame_pop_events ||
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313 avail.can_generate_method_entry_events ||
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314 avail.can_generate_method_exit_events;
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315 bool enter_all_methods =
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316 interp_events ||
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317 avail.can_generate_breakpoint_events;
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318 UseFastEmptyMethods = !enter_all_methods;
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319 UseFastAccessorMethods = !enter_all_methods;
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320
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321 if (avail.can_generate_breakpoint_events) {
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322 RewriteFrequentPairs = false;
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323 }
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324
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325 // If can_redefine_classes is enabled in the onload phase then we know that the
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326 // dependency information recorded by the compiler is complete.
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327 if ((avail.can_redefine_classes || avail.can_retransform_classes) &&
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328 JvmtiEnv::get_phase() == JVMTI_PHASE_ONLOAD) {
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329 JvmtiExport::set_all_dependencies_are_recorded(true);
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330 }
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331
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332 JvmtiExport::set_can_get_source_debug_extension(avail.can_get_source_debug_extension);
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333 JvmtiExport::set_can_examine_or_deopt_anywhere(
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334 avail.can_generate_breakpoint_events ||
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335 interp_events ||
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336 avail.can_redefine_classes ||
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337 avail.can_retransform_classes ||
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338 avail.can_access_local_variables ||
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339 avail.can_get_owned_monitor_info ||
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340 avail.can_get_current_contended_monitor ||
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341 avail.can_get_monitor_info ||
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342 avail.can_get_owned_monitor_stack_depth_info);
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343 JvmtiExport::set_can_maintain_original_method_order(avail.can_maintain_original_method_order);
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344 JvmtiExport::set_can_post_interpreter_events(interp_events);
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345 JvmtiExport::set_can_hotswap_or_post_breakpoint(
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346 avail.can_generate_breakpoint_events ||
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347 avail.can_redefine_classes ||
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348 avail.can_retransform_classes);
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349 JvmtiExport::set_can_modify_any_class(
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350 avail.can_generate_breakpoint_events ||
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351 avail.can_generate_all_class_hook_events);
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352 JvmtiExport::set_can_walk_any_space(
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353 avail.can_tag_objects); // disable sharing in onload phase
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354 JvmtiExport::set_can_access_local_variables(
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355 avail.can_access_local_variables ||
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356 avail.can_redefine_classes ||
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357 avail.can_retransform_classes);
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358 JvmtiExport::set_can_post_exceptions(
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359 avail.can_generate_exception_events ||
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360 avail.can_generate_frame_pop_events ||
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361 avail.can_generate_method_exit_events);
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362 JvmtiExport::set_can_post_breakpoint(avail.can_generate_breakpoint_events);
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363 JvmtiExport::set_can_post_field_access(avail.can_generate_field_access_events);
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364 JvmtiExport::set_can_post_field_modification(avail.can_generate_field_modification_events);
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365 JvmtiExport::set_can_post_method_entry(avail.can_generate_method_entry_events);
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366 JvmtiExport::set_can_post_method_exit(avail.can_generate_method_exit_events ||
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367 avail.can_generate_frame_pop_events);
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368 JvmtiExport::set_can_pop_frame(avail.can_pop_frame);
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369 JvmtiExport::set_can_force_early_return(avail.can_force_early_return);
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370 JvmtiExport::set_should_clean_up_heap_objects(avail.can_generate_breakpoint_events);
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371 }
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372
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373 #ifndef PRODUCT
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374
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375 void JvmtiManageCapabilities:: print(const jvmtiCapabilities* cap) {
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376 tty->print_cr("----- capabilities -----");
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377 if (cap->can_tag_objects)
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378 tty->print_cr("can_tag_objects");
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379 if (cap->can_generate_field_modification_events)
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380 tty->print_cr("can_generate_field_modification_events");
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381 if (cap->can_generate_field_access_events)
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382 tty->print_cr("can_generate_field_access_events");
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383 if (cap->can_get_bytecodes)
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384 tty->print_cr("can_get_bytecodes");
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385 if (cap->can_get_synthetic_attribute)
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386 tty->print_cr("can_get_synthetic_attribute");
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387 if (cap->can_get_owned_monitor_info)
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388 tty->print_cr("can_get_owned_monitor_info");
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389 if (cap->can_get_current_contended_monitor)
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390 tty->print_cr("can_get_current_contended_monitor");
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391 if (cap->can_get_monitor_info)
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392 tty->print_cr("can_get_monitor_info");
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393 if (cap->can_get_constant_pool)
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394 tty->print_cr("can_get_constant_pool");
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395 if (cap->can_pop_frame)
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396 tty->print_cr("can_pop_frame");
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397 if (cap->can_force_early_return)
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398 tty->print_cr("can_force_early_return");
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399 if (cap->can_redefine_classes)
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400 tty->print_cr("can_redefine_classes");
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401 if (cap->can_retransform_classes)
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402 tty->print_cr("can_retransform_classes");
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403 if (cap->can_signal_thread)
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404 tty->print_cr("can_signal_thread");
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405 if (cap->can_get_source_file_name)
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406 tty->print_cr("can_get_source_file_name");
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407 if (cap->can_get_line_numbers)
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408 tty->print_cr("can_get_line_numbers");
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409 if (cap->can_get_source_debug_extension)
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410 tty->print_cr("can_get_source_debug_extension");
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411 if (cap->can_access_local_variables)
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412 tty->print_cr("can_access_local_variables");
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413 if (cap->can_maintain_original_method_order)
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414 tty->print_cr("can_maintain_original_method_order");
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415 if (cap->can_generate_single_step_events)
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416 tty->print_cr("can_generate_single_step_events");
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417 if (cap->can_generate_exception_events)
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418 tty->print_cr("can_generate_exception_events");
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419 if (cap->can_generate_frame_pop_events)
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420 tty->print_cr("can_generate_frame_pop_events");
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421 if (cap->can_generate_breakpoint_events)
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422 tty->print_cr("can_generate_breakpoint_events");
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423 if (cap->can_suspend)
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424 tty->print_cr("can_suspend");
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425 if (cap->can_redefine_any_class )
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426 tty->print_cr("can_redefine_any_class");
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427 if (cap->can_retransform_any_class )
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428 tty->print_cr("can_retransform_any_class");
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429 if (cap->can_get_current_thread_cpu_time)
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430 tty->print_cr("can_get_current_thread_cpu_time");
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431 if (cap->can_get_thread_cpu_time)
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432 tty->print_cr("can_get_thread_cpu_time");
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433 if (cap->can_generate_method_entry_events)
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434 tty->print_cr("can_generate_method_entry_events");
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435 if (cap->can_generate_method_exit_events)
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436 tty->print_cr("can_generate_method_exit_events");
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437 if (cap->can_generate_all_class_hook_events)
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438 tty->print_cr("can_generate_all_class_hook_events");
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439 if (cap->can_generate_compiled_method_load_events)
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440 tty->print_cr("can_generate_compiled_method_load_events");
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441 if (cap->can_generate_monitor_events)
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442 tty->print_cr("can_generate_monitor_events");
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443 if (cap->can_generate_vm_object_alloc_events)
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444 tty->print_cr("can_generate_vm_object_alloc_events");
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445 if (cap->can_generate_native_method_bind_events)
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446 tty->print_cr("can_generate_native_method_bind_events");
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447 if (cap->can_generate_garbage_collection_events)
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448 tty->print_cr("can_generate_garbage_collection_events");
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449 if (cap->can_generate_object_free_events)
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450 tty->print_cr("can_generate_object_free_events");
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451 if (cap->can_generate_resource_exhaustion_heap_events)
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452 tty->print_cr("can_generate_resource_exhaustion_heap_events");
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453 if (cap->can_generate_resource_exhaustion_threads_events)
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454 tty->print_cr("can_generate_resource_exhaustion_threads_events");
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455 }
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456
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457 #endif
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