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0
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1 /*
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2 * Copyright 2003-2007 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/_jvmtiEnvBase.cpp.incl"
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26
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27
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28 ///////////////////////////////////////////////////////////////
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29 //
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30 // JvmtiEnvBase
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31 //
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32
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33 JvmtiEnvBase* JvmtiEnvBase::_head_environment = NULL;
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34
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35 bool JvmtiEnvBase::_globally_initialized = false;
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36 volatile bool JvmtiEnvBase::_needs_clean_up = false;
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37
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38 jvmtiPhase JvmtiEnvBase::_phase = JVMTI_PHASE_PRIMORDIAL;
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39
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40 volatile int JvmtiEnvBase::_dying_thread_env_iteration_count = 0;
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41
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42 extern jvmtiInterface_1_ jvmti_Interface;
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43 extern jvmtiInterface_1_ jvmtiTrace_Interface;
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44
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45
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46 // perform initializations that must occur before any JVMTI environments
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47 // are released but which should only be initialized once (no matter
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48 // how many environments are created).
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49 void
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50 JvmtiEnvBase::globally_initialize() {
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51 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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52 assert(_globally_initialized == false, "bad call");
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53
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54 JvmtiManageCapabilities::initialize();
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55
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56 #ifndef JVMTI_KERNEL
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57 // register extension functions and events
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58 JvmtiExtensions::register_extensions();
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59 #endif // !JVMTI_KERNEL
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60
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61 #ifdef JVMTI_TRACE
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62 JvmtiTrace::initialize();
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63 #endif
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64
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65 _globally_initialized = true;
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66 }
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67
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68
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69 void
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70 JvmtiEnvBase::initialize() {
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71 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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72
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73 // Add this environment to the end of the environment list (order is important)
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74 {
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75 // This block of code must not contain any safepoints, as list deallocation
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76 // (which occurs at a safepoint) cannot occur simultaneously with this list
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77 // addition. Note: No_Safepoint_Verifier cannot, currently, be used before
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78 // threads exist.
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79 JvmtiEnvIterator it;
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80 JvmtiEnvBase *previous_env = NULL;
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81 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
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82 previous_env = env;
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83 }
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84 if (previous_env == NULL) {
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85 _head_environment = this;
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86 } else {
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87 previous_env->set_next_environment(this);
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88 }
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89 }
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90
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91 if (_globally_initialized == false) {
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92 globally_initialize();
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93 }
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94 }
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95
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96
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97 JvmtiEnvBase::JvmtiEnvBase() : _env_event_enable() {
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98 _env_local_storage = NULL;
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99 _tag_map = NULL;
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100 _native_method_prefix_count = 0;
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101 _native_method_prefixes = NULL;
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102 _next = NULL;
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103 _class_file_load_hook_ever_enabled = false;
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104
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105 // Moot since ClassFileLoadHook not yet enabled.
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106 // But "true" will give a more predictable ClassFileLoadHook behavior
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107 // for environment creation during ClassFileLoadHook.
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108 _is_retransformable = true;
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109
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110 // all callbacks initially NULL
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111 memset(&_event_callbacks,0,sizeof(jvmtiEventCallbacks));
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112
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113 // all capabilities initially off
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114 memset(&_current_capabilities, 0, sizeof(_current_capabilities));
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115
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116 // all prohibited capabilities initially off
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117 memset(&_prohibited_capabilities, 0, sizeof(_prohibited_capabilities));
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118
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119 _magic = JVMTI_MAGIC;
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120
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121 JvmtiEventController::env_initialize((JvmtiEnv*)this);
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122
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123 #ifdef JVMTI_TRACE
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124 _jvmti_external.functions = strlen(TraceJVMTI)? &jvmtiTrace_Interface : &jvmti_Interface;
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125 #else
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126 _jvmti_external.functions = &jvmti_Interface;
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127 #endif
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128 }
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129
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130
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131 void
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132 JvmtiEnvBase::dispose() {
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133
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134 #ifdef JVMTI_TRACE
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135 JvmtiTrace::shutdown();
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136 #endif
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137
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138 // Dispose of event info and let the event controller call us back
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139 // in a locked state (env_dispose, below)
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140 JvmtiEventController::env_dispose(this);
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141 }
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142
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143 void
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144 JvmtiEnvBase::env_dispose() {
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145 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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146
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147 // We have been entered with all events disabled on this environment.
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148 // A race to re-enable events (by setting callbacks) is prevented by
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149 // checking for a valid environment when setting callbacks (while
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150 // holding the JvmtiThreadState_lock).
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151
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152 // Mark as invalid.
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153 _magic = DISPOSED_MAGIC;
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154
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155 // Relinquish all capabilities.
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156 jvmtiCapabilities *caps = get_capabilities();
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157 JvmtiManageCapabilities::relinquish_capabilities(caps, caps, caps);
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158
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159 // Same situation as with events (see above)
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160 set_native_method_prefixes(0, NULL);
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161
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162 #ifndef JVMTI_KERNEL
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163 JvmtiTagMap* tag_map_to_deallocate = _tag_map;
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164 set_tag_map(NULL);
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165 // A tag map can be big, deallocate it now
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166 if (tag_map_to_deallocate != NULL) {
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167 delete tag_map_to_deallocate;
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168 }
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169 #endif // !JVMTI_KERNEL
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170
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171 _needs_clean_up = true;
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172 }
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173
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174
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175 JvmtiEnvBase::~JvmtiEnvBase() {
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176 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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177
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178 // There is a small window of time during which the tag map of a
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179 // disposed environment could have been reallocated.
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180 // Make sure it is gone.
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181 #ifndef JVMTI_KERNEL
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182 JvmtiTagMap* tag_map_to_deallocate = _tag_map;
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183 set_tag_map(NULL);
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184 // A tag map can be big, deallocate it now
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185 if (tag_map_to_deallocate != NULL) {
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186 delete tag_map_to_deallocate;
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187 }
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188 #endif // !JVMTI_KERNEL
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189
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190 _magic = BAD_MAGIC;
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191 }
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192
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193
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194 void
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195 JvmtiEnvBase::periodic_clean_up() {
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196 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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197
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198 // JvmtiEnvBase reference is saved in JvmtiEnvThreadState. So
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199 // clean up JvmtiThreadState before deleting JvmtiEnv pointer.
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200 JvmtiThreadState::periodic_clean_up();
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201
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202 // Unlink all invalid environments from the list of environments
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203 // and deallocate them
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204 JvmtiEnvIterator it;
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205 JvmtiEnvBase* previous_env = NULL;
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206 JvmtiEnvBase* env = it.first();
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207 while (env != NULL) {
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208 if (env->is_valid()) {
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209 previous_env = env;
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210 env = it.next(env);
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211 } else {
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212 // This one isn't valid, remove it from the list and deallocate it
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213 JvmtiEnvBase* defunct_env = env;
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214 env = it.next(env);
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215 if (previous_env == NULL) {
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216 _head_environment = env;
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217 } else {
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218 previous_env->set_next_environment(env);
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219 }
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220 delete defunct_env;
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221 }
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222 }
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223
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224 }
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225
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226
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227 void
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228 JvmtiEnvBase::check_for_periodic_clean_up() {
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229 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
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230
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231 class ThreadInsideIterationClosure: public ThreadClosure {
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232 private:
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233 bool _inside;
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234 public:
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235 ThreadInsideIterationClosure() : _inside(false) {};
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236
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237 void do_thread(Thread* thread) {
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238 _inside |= thread->is_inside_jvmti_env_iteration();
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239 }
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240
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241 bool is_inside_jvmti_env_iteration() {
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242 return _inside;
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243 }
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244 };
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245
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246 if (_needs_clean_up) {
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247 // Check if we are currently iterating environment,
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248 // deallocation should not occur if we are
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249 ThreadInsideIterationClosure tiic;
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250 Threads::threads_do(&tiic);
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251 if (!tiic.is_inside_jvmti_env_iteration() &&
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252 !is_inside_dying_thread_env_iteration()) {
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253 _needs_clean_up = false;
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254 JvmtiEnvBase::periodic_clean_up();
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255 }
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256 }
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257 }
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258
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259
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260 void
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261 JvmtiEnvBase::record_first_time_class_file_load_hook_enabled() {
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262 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(),
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263 "sanity check");
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264
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265 if (!_class_file_load_hook_ever_enabled) {
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266 _class_file_load_hook_ever_enabled = true;
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267
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268 if (get_capabilities()->can_retransform_classes) {
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269 _is_retransformable = true;
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270 } else {
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271 _is_retransformable = false;
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272
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273 // cannot add retransform capability after ClassFileLoadHook has been enabled
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274 get_prohibited_capabilities()->can_retransform_classes = 1;
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275 }
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276 }
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277 }
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278
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279
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280 void
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281 JvmtiEnvBase::record_class_file_load_hook_enabled() {
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282 if (!_class_file_load_hook_ever_enabled) {
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283 if (Threads::number_of_threads() == 0) {
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284 record_first_time_class_file_load_hook_enabled();
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285 } else {
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286 MutexLocker mu(JvmtiThreadState_lock);
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287 record_first_time_class_file_load_hook_enabled();
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288 }
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289 }
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290 }
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291
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292
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293 jvmtiError
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294 JvmtiEnvBase::set_native_method_prefixes(jint prefix_count, char** prefixes) {
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295 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(),
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296 "sanity check");
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297
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298 int old_prefix_count = get_native_method_prefix_count();
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299 char **old_prefixes = get_native_method_prefixes();
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300
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301 // allocate and install the new prefixex
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302 if (prefix_count == 0 || !is_valid()) {
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303 _native_method_prefix_count = 0;
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304 _native_method_prefixes = NULL;
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305 } else {
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306 // there are prefixes, allocate an array to hold them, and fill it
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307 char** new_prefixes = (char**)os::malloc((prefix_count) * sizeof(char*));
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308 if (new_prefixes == NULL) {
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309 return JVMTI_ERROR_OUT_OF_MEMORY;
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310 }
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311 for (int i = 0; i < prefix_count; i++) {
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312 char* prefix = prefixes[i];
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313 if (prefix == NULL) {
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314 for (int j = 0; j < (i-1); j++) {
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315 os::free(new_prefixes[j]);
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316 }
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317 os::free(new_prefixes);
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318 return JVMTI_ERROR_NULL_POINTER;
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319 }
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320 prefix = os::strdup(prefixes[i]);
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321 if (prefix == NULL) {
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322 for (int j = 0; j < (i-1); j++) {
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323 os::free(new_prefixes[j]);
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324 }
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325 os::free(new_prefixes);
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326 return JVMTI_ERROR_OUT_OF_MEMORY;
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327 }
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328 new_prefixes[i] = prefix;
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329 }
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330 _native_method_prefix_count = prefix_count;
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331 _native_method_prefixes = new_prefixes;
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332 }
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333
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334 // now that we know the new prefixes have been successfully installed we can
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335 // safely remove the old ones
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336 if (old_prefix_count != 0) {
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337 for (int i = 0; i < old_prefix_count; i++) {
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338 os::free(old_prefixes[i]);
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339 }
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340 os::free(old_prefixes);
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341 }
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342
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343 return JVMTI_ERROR_NONE;
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344 }
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345
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346
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347 // Collect all the prefixes which have been set in any JVM TI environments
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348 // by the SetNativeMethodPrefix(es) functions. Be sure to maintain the
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349 // order of environments and the order of prefixes within each environment.
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350 // Return in a resource allocated array.
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351 char**
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352 JvmtiEnvBase::get_all_native_method_prefixes(int* count_ptr) {
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353 assert(Threads::number_of_threads() == 0 ||
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354 SafepointSynchronize::is_at_safepoint() ||
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355 JvmtiThreadState_lock->is_locked(),
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356 "sanity check");
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357
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358 int total_count = 0;
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359 GrowableArray<char*>* prefix_array =new GrowableArray<char*>(5);
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360
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361 JvmtiEnvIterator it;
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362 for (JvmtiEnvBase* env = it.first(); env != NULL; env = it.next(env)) {
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363 int prefix_count = env->get_native_method_prefix_count();
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364 char** prefixes = env->get_native_method_prefixes();
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365 for (int j = 0; j < prefix_count; j++) {
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366 // retrieve a prefix and so that it is safe against asynchronous changes
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367 // copy it into the resource area
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368 char* prefix = prefixes[j];
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369 char* prefix_copy = NEW_RESOURCE_ARRAY(char, strlen(prefix)+1);
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370 strcpy(prefix_copy, prefix);
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371 prefix_array->at_put_grow(total_count++, prefix_copy);
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372 }
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373 }
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374
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375 char** all_prefixes = NEW_RESOURCE_ARRAY(char*, total_count);
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376 char** p = all_prefixes;
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377 for (int i = 0; i < total_count; ++i) {
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378 *p++ = prefix_array->at(i);
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379 }
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380 *count_ptr = total_count;
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381 return all_prefixes;
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382 }
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383
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384 void
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385 JvmtiEnvBase::set_event_callbacks(const jvmtiEventCallbacks* callbacks,
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386 jint size_of_callbacks) {
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387 assert(Threads::number_of_threads() == 0 || JvmtiThreadState_lock->is_locked(), "sanity check");
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388
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389 size_t byte_cnt = sizeof(jvmtiEventCallbacks);
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390
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391 // clear in either case to be sure we got any gap between sizes
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392 memset(&_event_callbacks, 0, byte_cnt);
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393
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394 // Now that JvmtiThreadState_lock is held, prevent a possible race condition where events
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395 // are re-enabled by a call to set event callbacks where the DisposeEnvironment
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396 // occurs after the boiler-plate environment check and before the lock is acquired.
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397 if (callbacks != NULL && is_valid()) {
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398 if (size_of_callbacks < (jint)byte_cnt) {
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399 byte_cnt = size_of_callbacks;
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400 }
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401 memcpy(&_event_callbacks, callbacks, byte_cnt);
|
|
|
402 }
|
|
|
403 }
|
|
|
404
|
|
|
405 // Called from JVMTI entry points which perform stack walking. If the
|
|
|
406 // associated JavaThread is the current thread, then wait_for_suspend
|
|
|
407 // is not used. Otherwise, it determines if we should wait for the
|
|
|
408 // "other" thread to complete external suspension. (NOTE: in future
|
|
|
409 // releases the suspension mechanism should be reimplemented so this
|
|
|
410 // is not necessary.)
|
|
|
411 //
|
|
|
412 bool
|
|
|
413 JvmtiEnvBase::is_thread_fully_suspended(JavaThread* thr, bool wait_for_suspend, uint32_t *bits) {
|
|
|
414 // "other" threads require special handling
|
|
|
415 if (thr != JavaThread::current()) {
|
|
|
416 if (wait_for_suspend) {
|
|
|
417 // We are allowed to wait for the external suspend to complete
|
|
|
418 // so give the other thread a chance to get suspended.
|
|
|
419 if (!thr->wait_for_ext_suspend_completion(SuspendRetryCount,
|
|
|
420 SuspendRetryDelay, bits)) {
|
|
|
421 // didn't make it so let the caller know
|
|
|
422 return false;
|
|
|
423 }
|
|
|
424 }
|
|
|
425 // We aren't allowed to wait for the external suspend to complete
|
|
|
426 // so if the other thread isn't externally suspended we need to
|
|
|
427 // let the caller know.
|
|
|
428 else if (!thr->is_ext_suspend_completed_with_lock(bits)) {
|
|
|
429 return false;
|
|
|
430 }
|
|
|
431 }
|
|
|
432
|
|
|
433 return true;
|
|
|
434 }
|
|
|
435
|
|
|
436
|
|
|
437 // In the fullness of time, all users of the method should instead
|
|
|
438 // directly use allocate, besides being cleaner and faster, this will
|
|
|
439 // mean much better out of memory handling
|
|
|
440 unsigned char *
|
|
|
441 JvmtiEnvBase::jvmtiMalloc(jlong size) {
|
|
|
442 unsigned char* mem;
|
|
|
443 jvmtiError result = allocate(size, &mem);
|
|
|
444 assert(result == JVMTI_ERROR_NONE, "Allocate failed");
|
|
|
445 return mem;
|
|
|
446 }
|
|
|
447
|
|
|
448
|
|
|
449 //
|
|
|
450 // Threads
|
|
|
451 //
|
|
|
452
|
|
|
453 jobject *
|
|
|
454 JvmtiEnvBase::new_jobjectArray(int length, Handle *handles) {
|
|
|
455 if (length == 0) {
|
|
|
456 return NULL;
|
|
|
457 }
|
|
|
458
|
|
|
459 jobject *objArray = (jobject *) jvmtiMalloc(sizeof(jobject) * length);
|
|
|
460 NULL_CHECK(objArray, NULL);
|
|
|
461
|
|
|
462 for (int i=0; i<length; i++) {
|
|
|
463 objArray[i] = jni_reference(handles[i]);
|
|
|
464 }
|
|
|
465 return objArray;
|
|
|
466 }
|
|
|
467
|
|
|
468 jthread *
|
|
|
469 JvmtiEnvBase::new_jthreadArray(int length, Handle *handles) {
|
|
|
470 return (jthread *) new_jobjectArray(length,handles);
|
|
|
471 }
|
|
|
472
|
|
|
473 jthreadGroup *
|
|
|
474 JvmtiEnvBase::new_jthreadGroupArray(int length, Handle *handles) {
|
|
|
475 return (jthreadGroup *) new_jobjectArray(length,handles);
|
|
|
476 }
|
|
|
477
|
|
|
478
|
|
|
479 JavaThread *
|
|
|
480 JvmtiEnvBase::get_JavaThread(jthread jni_thread) {
|
|
|
481 oop t = JNIHandles::resolve_external_guard(jni_thread);
|
|
|
482 if (t == NULL || !t->is_a(SystemDictionary::thread_klass())) {
|
|
|
483 return NULL;
|
|
|
484 }
|
|
|
485 // The following returns NULL if the thread has not yet run or is in
|
|
|
486 // process of exiting
|
|
|
487 return java_lang_Thread::thread(t);
|
|
|
488 }
|
|
|
489
|
|
|
490
|
|
|
491 // update the access_flags for the field in the klass
|
|
|
492 void
|
|
|
493 JvmtiEnvBase::update_klass_field_access_flag(fieldDescriptor *fd) {
|
|
|
494 instanceKlass* ik = instanceKlass::cast(fd->field_holder());
|
|
|
495 typeArrayOop fields = ik->fields();
|
|
|
496 fields->ushort_at_put(fd->index(), (jushort)fd->access_flags().as_short());
|
|
|
497 }
|
|
|
498
|
|
|
499
|
|
|
500 // return the vframe on the specified thread and depth, NULL if no such frame
|
|
|
501 vframe*
|
|
|
502 JvmtiEnvBase::vframeFor(JavaThread* java_thread, jint depth) {
|
|
|
503 if (!java_thread->has_last_Java_frame()) {
|
|
|
504 return NULL;
|
|
|
505 }
|
|
|
506 RegisterMap reg_map(java_thread);
|
|
|
507 vframe *vf = java_thread->last_java_vframe(®_map);
|
|
|
508 int d = 0;
|
|
|
509 while ((vf != NULL) && (d < depth)) {
|
|
|
510 vf = vf->java_sender();
|
|
|
511 d++;
|
|
|
512 }
|
|
|
513 return vf;
|
|
|
514 }
|
|
|
515
|
|
|
516
|
|
|
517 //
|
|
|
518 // utilities: JNI objects
|
|
|
519 //
|
|
|
520
|
|
|
521
|
|
|
522 jclass
|
|
|
523 JvmtiEnvBase::get_jni_class_non_null(klassOop k) {
|
|
|
524 assert(k != NULL, "k != NULL");
|
|
|
525 return (jclass)jni_reference(Klass::cast(k)->java_mirror());
|
|
|
526 }
|
|
|
527
|
|
|
528 #ifndef JVMTI_KERNEL
|
|
|
529
|
|
|
530 //
|
|
|
531 // Field Information
|
|
|
532 //
|
|
|
533
|
|
|
534 bool
|
|
|
535 JvmtiEnvBase::get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd) {
|
|
|
536 if (!jfieldIDWorkaround::is_valid_jfieldID(k, field)) {
|
|
|
537 return false;
|
|
|
538 }
|
|
|
539 bool found = false;
|
|
|
540 if (jfieldIDWorkaround::is_static_jfieldID(field)) {
|
|
|
541 JNIid* id = jfieldIDWorkaround::from_static_jfieldID(field);
|
|
|
542 int offset = id->offset();
|
|
|
543 klassOop holder = id->holder();
|
|
|
544 found = instanceKlass::cast(holder)->find_local_field_from_offset(offset, true, fd);
|
|
|
545 } else {
|
|
|
546 // Non-static field. The fieldID is really the offset of the field within the object.
|
|
|
547 int offset = jfieldIDWorkaround::from_instance_jfieldID(k, field);
|
|
|
548 found = instanceKlass::cast(k)->find_field_from_offset(offset, false, fd);
|
|
|
549 }
|
|
|
550 return found;
|
|
|
551 }
|
|
|
552
|
|
|
553 //
|
|
|
554 // Object Monitor Information
|
|
|
555 //
|
|
|
556
|
|
|
557 //
|
|
|
558 // Count the number of objects for a lightweight monitor. The hobj
|
|
|
559 // parameter is object that owns the monitor so this routine will
|
|
|
560 // count the number of times the same object was locked by frames
|
|
|
561 // in java_thread.
|
|
|
562 //
|
|
|
563 jint
|
|
|
564 JvmtiEnvBase::count_locked_objects(JavaThread *java_thread, Handle hobj) {
|
|
|
565 jint ret = 0;
|
|
|
566 if (!java_thread->has_last_Java_frame()) {
|
|
|
567 return ret; // no Java frames so no monitors
|
|
|
568 }
|
|
|
569
|
|
|
570 ResourceMark rm;
|
|
|
571 HandleMark hm;
|
|
|
572 RegisterMap reg_map(java_thread);
|
|
|
573
|
|
|
574 for(javaVFrame *jvf=java_thread->last_java_vframe(®_map); jvf != NULL;
|
|
|
575 jvf = jvf->java_sender()) {
|
|
|
576 GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
|
577 if (!mons->is_empty()) {
|
|
|
578 for (int i = 0; i < mons->length(); i++) {
|
|
|
579 MonitorInfo *mi = mons->at(i);
|
|
|
580
|
|
|
581 // see if owner of the monitor is our object
|
|
|
582 if (mi->owner() != NULL && mi->owner() == hobj()) {
|
|
|
583 ret++;
|
|
|
584 }
|
|
|
585 }
|
|
|
586 }
|
|
|
587 }
|
|
|
588 return ret;
|
|
|
589 }
|
|
|
590
|
|
|
591
|
|
|
592
|
|
|
593 jvmtiError
|
|
|
594 JvmtiEnvBase::get_current_contended_monitor(JavaThread *calling_thread, JavaThread *java_thread, jobject *monitor_ptr) {
|
|
|
595 #ifdef ASSERT
|
|
|
596 uint32_t debug_bits = 0;
|
|
|
597 #endif
|
|
|
598 assert((SafepointSynchronize::is_at_safepoint() ||
|
|
|
599 is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
|
600 "at safepoint or target thread is suspended");
|
|
|
601 oop obj = NULL;
|
|
|
602 ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
|
603 if (mon == NULL) {
|
|
|
604 // thread is not doing an Object.wait() call
|
|
|
605 mon = java_thread->current_pending_monitor();
|
|
|
606 if (mon != NULL) {
|
|
|
607 // The thread is trying to enter() or raw_enter() an ObjectMonitor.
|
|
|
608 obj = (oop)mon->object();
|
|
|
609 // If obj == NULL, then ObjectMonitor is raw which doesn't count
|
|
|
610 // as contended for this API
|
|
|
611 }
|
|
|
612 // implied else: no contended ObjectMonitor
|
|
|
613 } else {
|
|
|
614 // thread is doing an Object.wait() call
|
|
|
615 obj = (oop)mon->object();
|
|
|
616 assert(obj != NULL, "Object.wait() should have an object");
|
|
|
617 }
|
|
|
618
|
|
|
619 if (obj == NULL) {
|
|
|
620 *monitor_ptr = NULL;
|
|
|
621 } else {
|
|
|
622 HandleMark hm;
|
|
|
623 Handle hobj(obj);
|
|
|
624 *monitor_ptr = jni_reference(calling_thread, hobj);
|
|
|
625 }
|
|
|
626 return JVMTI_ERROR_NONE;
|
|
|
627 }
|
|
|
628
|
|
|
629
|
|
|
630 jvmtiError
|
|
|
631 JvmtiEnvBase::get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
|
|
|
632 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list) {
|
|
|
633 jvmtiError err = JVMTI_ERROR_NONE;
|
|
|
634 #ifdef ASSERT
|
|
|
635 uint32_t debug_bits = 0;
|
|
|
636 #endif
|
|
|
637 assert((SafepointSynchronize::is_at_safepoint() ||
|
|
|
638 is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
|
639 "at safepoint or target thread is suspended");
|
|
|
640
|
|
|
641 if (java_thread->has_last_Java_frame()) {
|
|
|
642 ResourceMark rm;
|
|
|
643 HandleMark hm;
|
|
|
644 RegisterMap reg_map(java_thread);
|
|
|
645
|
|
|
646 int depth = 0;
|
|
|
647 for (javaVFrame *jvf = java_thread->last_java_vframe(®_map); jvf != NULL;
|
|
|
648 jvf = jvf->java_sender()) {
|
|
|
649 if (depth++ < MaxJavaStackTraceDepth) { // check for stack too deep
|
|
|
650 // add locked objects for this frame into list
|
|
|
651 err = get_locked_objects_in_frame(calling_thread, java_thread, jvf, owned_monitors_list, depth-1);
|
|
|
652 if (err != JVMTI_ERROR_NONE) {
|
|
|
653 return err;
|
|
|
654 }
|
|
|
655 }
|
|
|
656 }
|
|
|
657 }
|
|
|
658
|
|
|
659 // Get off stack monitors. (e.g. acquired via jni MonitorEnter).
|
|
|
660 JvmtiMonitorClosure jmc(java_thread, calling_thread, owned_monitors_list, this);
|
|
|
661 ObjectSynchronizer::monitors_iterate(&jmc);
|
|
|
662 err = jmc.error();
|
|
|
663
|
|
|
664 return err;
|
|
|
665 }
|
|
|
666
|
|
|
667 // Save JNI local handles for any objects that this frame owns.
|
|
|
668 jvmtiError
|
|
|
669 JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread* java_thread,
|
|
|
670 javaVFrame *jvf, GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list, int stack_depth) {
|
|
|
671 jvmtiError err = JVMTI_ERROR_NONE;
|
|
|
672 ResourceMark rm;
|
|
|
673
|
|
|
674 GrowableArray<MonitorInfo*>* mons = jvf->monitors();
|
|
|
675 if (mons->is_empty()) {
|
|
|
676 return err; // this javaVFrame holds no monitors
|
|
|
677 }
|
|
|
678
|
|
|
679 HandleMark hm;
|
|
|
680 oop wait_obj = NULL;
|
|
|
681 {
|
|
|
682 // save object of current wait() call (if any) for later comparison
|
|
|
683 ObjectMonitor *mon = java_thread->current_waiting_monitor();
|
|
|
684 if (mon != NULL) {
|
|
|
685 wait_obj = (oop)mon->object();
|
|
|
686 }
|
|
|
687 }
|
|
|
688 oop pending_obj = NULL;
|
|
|
689 {
|
|
|
690 // save object of current enter() call (if any) for later comparison
|
|
|
691 ObjectMonitor *mon = java_thread->current_pending_monitor();
|
|
|
692 if (mon != NULL) {
|
|
|
693 pending_obj = (oop)mon->object();
|
|
|
694 }
|
|
|
695 }
|
|
|
696
|
|
|
697 for (int i = 0; i < mons->length(); i++) {
|
|
|
698 MonitorInfo *mi = mons->at(i);
|
|
|
699
|
|
|
700 oop obj = mi->owner();
|
|
|
701 if (obj == NULL) {
|
|
|
702 // this monitor doesn't have an owning object so skip it
|
|
|
703 continue;
|
|
|
704 }
|
|
|
705
|
|
|
706 if (wait_obj == obj) {
|
|
|
707 // the thread is waiting on this monitor so it isn't really owned
|
|
|
708 continue;
|
|
|
709 }
|
|
|
710
|
|
|
711 if (pending_obj == obj) {
|
|
|
712 // the thread is pending on this monitor so it isn't really owned
|
|
|
713 continue;
|
|
|
714 }
|
|
|
715
|
|
|
716 if (owned_monitors_list->length() > 0) {
|
|
|
717 // Our list has at least one object on it so we have to check
|
|
|
718 // for recursive object locking
|
|
|
719 bool found = false;
|
|
|
720 for (int j = 0; j < owned_monitors_list->length(); j++) {
|
|
|
721 jobject jobj = ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(j))->monitor;
|
|
|
722 oop check = JNIHandles::resolve(jobj);
|
|
|
723 if (check == obj) {
|
|
|
724 found = true; // we found the object
|
|
|
725 break;
|
|
|
726 }
|
|
|
727 }
|
|
|
728
|
|
|
729 if (found) {
|
|
|
730 // already have this object so don't include it
|
|
|
731 continue;
|
|
|
732 }
|
|
|
733 }
|
|
|
734
|
|
|
735 // add the owning object to our list
|
|
|
736 jvmtiMonitorStackDepthInfo *jmsdi;
|
|
|
737 err = allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi);
|
|
|
738 if (err != JVMTI_ERROR_NONE) {
|
|
|
739 return err;
|
|
|
740 }
|
|
|
741 Handle hobj(obj);
|
|
|
742 jmsdi->monitor = jni_reference(calling_thread, hobj);
|
|
|
743 jmsdi->stack_depth = stack_depth;
|
|
|
744 owned_monitors_list->append(jmsdi);
|
|
|
745 }
|
|
|
746
|
|
|
747 return err;
|
|
|
748 }
|
|
|
749
|
|
|
750 jvmtiError
|
|
|
751 JvmtiEnvBase::get_stack_trace(JavaThread *java_thread,
|
|
|
752 jint start_depth, jint max_count,
|
|
|
753 jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
|
|
|
754 #ifdef ASSERT
|
|
|
755 uint32_t debug_bits = 0;
|
|
|
756 #endif
|
|
|
757 assert((SafepointSynchronize::is_at_safepoint() ||
|
|
|
758 is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
|
759 "at safepoint or target thread is suspended");
|
|
|
760 int count = 0;
|
|
|
761 if (java_thread->has_last_Java_frame()) {
|
|
|
762 RegisterMap reg_map(java_thread);
|
|
|
763 Thread* current_thread = Thread::current();
|
|
|
764 ResourceMark rm(current_thread);
|
|
|
765 javaVFrame *jvf = java_thread->last_java_vframe(®_map);
|
|
|
766 HandleMark hm(current_thread);
|
|
|
767 if (start_depth != 0) {
|
|
|
768 if (start_depth > 0) {
|
|
|
769 for (int j = 0; j < start_depth && jvf != NULL; j++) {
|
|
|
770 jvf = jvf->java_sender();
|
|
|
771 }
|
|
|
772 if (jvf == NULL) {
|
|
|
773 // start_depth is deeper than the stack depth
|
|
|
774 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
|
775 }
|
|
|
776 } else { // start_depth < 0
|
|
|
777 // we are referencing the starting depth based on the oldest
|
|
|
778 // part of the stack.
|
|
|
779 // optimize to limit the number of times that java_sender() is called
|
|
|
780 javaVFrame *jvf_cursor = jvf;
|
|
|
781 javaVFrame *jvf_prev = NULL;
|
|
|
782 javaVFrame *jvf_prev_prev;
|
|
|
783 int j = 0;
|
|
|
784 while (jvf_cursor != NULL) {
|
|
|
785 jvf_prev_prev = jvf_prev;
|
|
|
786 jvf_prev = jvf_cursor;
|
|
|
787 for (j = 0; j > start_depth && jvf_cursor != NULL; j--) {
|
|
|
788 jvf_cursor = jvf_cursor->java_sender();
|
|
|
789 }
|
|
|
790 }
|
|
|
791 if (j == start_depth) {
|
|
|
792 // previous pointer is exactly where we want to start
|
|
|
793 jvf = jvf_prev;
|
|
|
794 } else {
|
|
|
795 // we need to back up further to get to the right place
|
|
|
796 if (jvf_prev_prev == NULL) {
|
|
|
797 // the -start_depth is greater than the stack depth
|
|
|
798 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
|
799 }
|
|
|
800 // j now is the number of frames on the stack starting with
|
|
|
801 // jvf_prev, we start from jvf_prev_prev and move older on
|
|
|
802 // the stack that many, the result is -start_depth frames
|
|
|
803 // remaining.
|
|
|
804 jvf = jvf_prev_prev;
|
|
|
805 for (; j < 0; j++) {
|
|
|
806 jvf = jvf->java_sender();
|
|
|
807 }
|
|
|
808 }
|
|
|
809 }
|
|
|
810 }
|
|
|
811 for (; count < max_count && jvf != NULL; count++) {
|
|
|
812 frame_buffer[count].method = jvf->method()->jmethod_id();
|
|
|
813 frame_buffer[count].location = (jvf->method()->is_native() ? -1 : jvf->bci());
|
|
|
814 jvf = jvf->java_sender();
|
|
|
815 }
|
|
|
816 } else {
|
|
|
817 if (start_depth != 0) {
|
|
|
818 // no frames and there is a starting depth
|
|
|
819 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
|
|
|
820 }
|
|
|
821 }
|
|
|
822 *count_ptr = count;
|
|
|
823 return JVMTI_ERROR_NONE;
|
|
|
824 }
|
|
|
825
|
|
|
826 jvmtiError
|
|
|
827 JvmtiEnvBase::get_frame_count(JvmtiThreadState *state, jint *count_ptr) {
|
|
|
828 assert((state != NULL),
|
|
|
829 "JavaThread should create JvmtiThreadState before calling this method");
|
|
|
830 *count_ptr = state->count_frames();
|
|
|
831 return JVMTI_ERROR_NONE;
|
|
|
832 }
|
|
|
833
|
|
|
834 jvmtiError
|
|
|
835 JvmtiEnvBase::get_frame_location(JavaThread *java_thread, jint depth,
|
|
|
836 jmethodID* method_ptr, jlocation* location_ptr) {
|
|
|
837 #ifdef ASSERT
|
|
|
838 uint32_t debug_bits = 0;
|
|
|
839 #endif
|
|
|
840 assert((SafepointSynchronize::is_at_safepoint() ||
|
|
|
841 is_thread_fully_suspended(java_thread, false, &debug_bits)),
|
|
|
842 "at safepoint or target thread is suspended");
|
|
|
843 Thread* current_thread = Thread::current();
|
|
|
844 ResourceMark rm(current_thread);
|
|
|
845
|
|
|
846 vframe *vf = vframeFor(java_thread, depth);
|
|
|
847 if (vf == NULL) {
|
|
|
848 return JVMTI_ERROR_NO_MORE_FRAMES;
|
|
|
849 }
|
|
|
850
|
|
|
851 // vframeFor should return a java frame. If it doesn't
|
|
|
852 // it means we've got an internal error and we return the
|
|
|
853 // error in product mode. In debug mode we will instead
|
|
|
854 // attempt to cast the vframe to a javaVFrame and will
|
|
|
855 // cause an assertion/crash to allow further diagnosis.
|
|
|
856 #ifdef PRODUCT
|
|
|
857 if (!vf->is_java_frame()) {
|
|
|
858 return JVMTI_ERROR_INTERNAL;
|
|
|
859 }
|
|
|
860 #endif
|
|
|
861
|
|
|
862 HandleMark hm(current_thread);
|
|
|
863 javaVFrame *jvf = javaVFrame::cast(vf);
|
|
|
864 methodOop method = jvf->method();
|
|
|
865 if (method->is_native()) {
|
|
|
866 *location_ptr = -1;
|
|
|
867 } else {
|
|
|
868 *location_ptr = jvf->bci();
|
|
|
869 }
|
|
|
870 *method_ptr = method->jmethod_id();
|
|
|
871
|
|
|
872 return JVMTI_ERROR_NONE;
|
|
|
873 }
|
|
|
874
|
|
|
875
|
|
|
876 jvmtiError
|
|
|
877 JvmtiEnvBase::get_object_monitor_usage(JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
|
|
|
878 HandleMark hm;
|
|
|
879 Handle hobj;
|
|
|
880
|
|
|
881 bool at_safepoint = SafepointSynchronize::is_at_safepoint();
|
|
|
882
|
|
|
883 // Check arguments
|
|
|
884 {
|
|
|
885 oop mirror = JNIHandles::resolve_external_guard(object);
|
|
|
886 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
|
|
|
887 NULL_CHECK(info_ptr, JVMTI_ERROR_NULL_POINTER);
|
|
|
888
|
|
|
889 hobj = Handle(mirror);
|
|
|
890 }
|
|
|
891
|
|
|
892 JavaThread *owning_thread = NULL;
|
|
|
893 ObjectMonitor *mon = NULL;
|
|
|
894 jvmtiMonitorUsage ret = {
|
|
|
895 NULL, 0, 0, NULL, 0, NULL
|
|
|
896 };
|
|
|
897
|
|
|
898 uint32_t debug_bits = 0;
|
|
|
899 // first derive the object's owner and entry_count (if any)
|
|
|
900 {
|
|
|
901 // Revoke any biases before querying the mark word
|
|
|
902 if (SafepointSynchronize::is_at_safepoint()) {
|
|
|
903 BiasedLocking::revoke_at_safepoint(hobj);
|
|
|
904 } else {
|
|
|
905 BiasedLocking::revoke_and_rebias(hobj, false, calling_thread);
|
|
|
906 }
|
|
|
907
|
|
|
908 address owner = NULL;
|
|
|
909 {
|
|
|
910 markOop mark = hobj()->mark();
|
|
|
911
|
|
|
912 if (!mark->has_monitor()) {
|
|
|
913 // this object has a lightweight monitor
|
|
|
914
|
|
|
915 if (mark->has_locker()) {
|
|
|
916 owner = (address)mark->locker(); // save the address of the Lock word
|
|
|
917 }
|
|
|
918 // implied else: no owner
|
|
|
919 } else {
|
|
|
920 // this object has a heavyweight monitor
|
|
|
921 mon = mark->monitor();
|
|
|
922
|
|
|
923 // The owner field of a heavyweight monitor may be NULL for no
|
|
|
924 // owner, a JavaThread * or it may still be the address of the
|
|
|
925 // Lock word in a JavaThread's stack. A monitor can be inflated
|
|
|
926 // by a non-owning JavaThread, but only the owning JavaThread
|
|
|
927 // can change the owner field from the Lock word to the
|
|
|
928 // JavaThread * and it may not have done that yet.
|
|
|
929 owner = (address)mon->owner();
|
|
|
930 }
|
|
|
931 }
|
|
|
932
|
|
|
933 if (owner != NULL) {
|
|
|
934 // This monitor is owned so we have to find the owning JavaThread.
|
|
|
935 // Since owning_thread_from_monitor_owner() grabs a lock, GC can
|
|
|
936 // move our object at this point. However, our owner value is safe
|
|
|
937 // since it is either the Lock word on a stack or a JavaThread *.
|
|
|
938 owning_thread = Threads::owning_thread_from_monitor_owner(owner, !at_safepoint);
|
|
|
939 assert(owning_thread != NULL, "sanity check");
|
|
|
940 if (owning_thread != NULL) { // robustness
|
|
|
941 // The monitor's owner either has to be the current thread, at safepoint
|
|
|
942 // or it has to be suspended. Any of these conditions will prevent both
|
|
|
943 // contending and waiting threads from modifying the state of
|
|
|
944 // the monitor.
|
|
|
945 if (!at_safepoint && !JvmtiEnv::is_thread_fully_suspended(owning_thread, true, &debug_bits)) {
|
|
|
946 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
|
947 }
|
|
|
948 HandleMark hm;
|
|
|
949 Handle th(owning_thread->threadObj());
|
|
|
950 ret.owner = (jthread)jni_reference(calling_thread, th);
|
|
|
951 }
|
|
|
952 // implied else: no owner
|
|
|
953 }
|
|
|
954
|
|
|
955 if (owning_thread != NULL) { // monitor is owned
|
|
|
956 if ((address)owning_thread == owner) {
|
|
|
957 // the owner field is the JavaThread *
|
|
|
958 assert(mon != NULL,
|
|
|
959 "must have heavyweight monitor with JavaThread * owner");
|
|
|
960 ret.entry_count = mon->recursions() + 1;
|
|
|
961 } else {
|
|
|
962 // The owner field is the Lock word on the JavaThread's stack
|
|
|
963 // so the recursions field is not valid. We have to count the
|
|
|
964 // number of recursive monitor entries the hard way. We pass
|
|
|
965 // a handle to survive any GCs along the way.
|
|
|
966 ResourceMark rm;
|
|
|
967 ret.entry_count = count_locked_objects(owning_thread, hobj);
|
|
|
968 }
|
|
|
969 }
|
|
|
970 // implied else: entry_count == 0
|
|
|
971 }
|
|
|
972
|
|
|
973 int nWant,nWait;
|
|
|
974 if (mon != NULL) {
|
|
|
975 // this object has a heavyweight monitor
|
|
|
976 nWant = mon->contentions(); // # of threads contending for monitor
|
|
|
977 nWait = mon->waiters(); // # of threads in Object.wait()
|
|
|
978 ret.waiter_count = nWant + nWait;
|
|
|
979 ret.notify_waiter_count = nWait;
|
|
|
980 } else {
|
|
|
981 // this object has a lightweight monitor
|
|
|
982 ret.waiter_count = 0;
|
|
|
983 ret.notify_waiter_count = 0;
|
|
|
984 }
|
|
|
985
|
|
|
986 // Allocate memory for heavyweight and lightweight monitor.
|
|
|
987 jvmtiError err;
|
|
|
988 err = allocate(ret.waiter_count * sizeof(jthread *), (unsigned char**)&ret.waiters);
|
|
|
989 if (err != JVMTI_ERROR_NONE) {
|
|
|
990 return err;
|
|
|
991 }
|
|
|
992 err = allocate(ret.notify_waiter_count * sizeof(jthread *),
|
|
|
993 (unsigned char**)&ret.notify_waiters);
|
|
|
994 if (err != JVMTI_ERROR_NONE) {
|
|
|
995 deallocate((unsigned char*)ret.waiters);
|
|
|
996 return err;
|
|
|
997 }
|
|
|
998
|
|
|
999 // now derive the rest of the fields
|
|
|
1000 if (mon != NULL) {
|
|
|
1001 // this object has a heavyweight monitor
|
|
|
1002
|
|
|
1003 // Number of waiters may actually be less than the waiter count.
|
|
|
1004 // So NULL out memory so that unused memory will be NULL.
|
|
|
1005 memset(ret.waiters, 0, ret.waiter_count * sizeof(jthread *));
|
|
|
1006 memset(ret.notify_waiters, 0, ret.notify_waiter_count * sizeof(jthread *));
|
|
|
1007
|
|
|
1008 if (ret.waiter_count > 0) {
|
|
|
1009 // we have contending and/or waiting threads
|
|
|
1010 HandleMark hm;
|
|
|
1011 if (nWant > 0) {
|
|
|
1012 // we have contending threads
|
|
|
1013 ResourceMark rm;
|
|
|
1014 // get_pending_threads returns only java thread so we do not need to
|
|
|
1015 // check for non java threads.
|
|
|
1016 GrowableArray<JavaThread*>* wantList = Threads::get_pending_threads(
|
|
|
1017 nWant, (address)mon, !at_safepoint);
|
|
|
1018 if (wantList->length() < nWant) {
|
|
|
1019 // robustness: the pending list has gotten smaller
|
|
|
1020 nWant = wantList->length();
|
|
|
1021 }
|
|
|
1022 for (int i = 0; i < nWant; i++) {
|
|
|
1023 JavaThread *pending_thread = wantList->at(i);
|
|
|
1024 // If the monitor has no owner, then a non-suspended contending
|
|
|
1025 // thread could potentially change the state of the monitor by
|
|
|
1026 // entering it. The JVM/TI spec doesn't allow this.
|
|
|
1027 if (owning_thread == NULL && !at_safepoint &
|
|
|
1028 !JvmtiEnv::is_thread_fully_suspended(pending_thread, true, &debug_bits)) {
|
|
|
1029 if (ret.owner != NULL) {
|
|
|
1030 destroy_jni_reference(calling_thread, ret.owner);
|
|
|
1031 }
|
|
|
1032 for (int j = 0; j < i; j++) {
|
|
|
1033 destroy_jni_reference(calling_thread, ret.waiters[j]);
|
|
|
1034 }
|
|
|
1035 deallocate((unsigned char*)ret.waiters);
|
|
|
1036 deallocate((unsigned char*)ret.notify_waiters);
|
|
|
1037 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
|
1038 }
|
|
|
1039 Handle th(pending_thread->threadObj());
|
|
|
1040 ret.waiters[i] = (jthread)jni_reference(calling_thread, th);
|
|
|
1041 }
|
|
|
1042 }
|
|
|
1043 if (nWait > 0) {
|
|
|
1044 // we have threads in Object.wait()
|
|
|
1045 int offset = nWant; // add after any contending threads
|
|
|
1046 ObjectWaiter *waiter = mon->first_waiter();
|
|
|
1047 for (int i = 0, j = 0; i < nWait; i++) {
|
|
|
1048 if (waiter == NULL) {
|
|
|
1049 // robustness: the waiting list has gotten smaller
|
|
|
1050 nWait = j;
|
|
|
1051 break;
|
|
|
1052 }
|
|
|
1053 Thread *t = mon->thread_of_waiter(waiter);
|
|
|
1054 if (t != NULL && t->is_Java_thread()) {
|
|
|
1055 JavaThread *wjava_thread = (JavaThread *)t;
|
|
|
1056 // If the thread was found on the ObjectWaiter list, then
|
|
|
1057 // it has not been notified. This thread can't change the
|
|
|
1058 // state of the monitor so it doesn't need to be suspended.
|
|
|
1059 Handle th(wjava_thread->threadObj());
|
|
|
1060 ret.waiters[offset + j] = (jthread)jni_reference(calling_thread, th);
|
|
|
1061 ret.notify_waiters[j++] = (jthread)jni_reference(calling_thread, th);
|
|
|
1062 }
|
|
|
1063 waiter = mon->next_waiter(waiter);
|
|
|
1064 }
|
|
|
1065 }
|
|
|
1066 }
|
|
|
1067
|
|
|
1068 // Adjust count. nWant and nWait count values may be less than original.
|
|
|
1069 ret.waiter_count = nWant + nWait;
|
|
|
1070 ret.notify_waiter_count = nWait;
|
|
|
1071 } else {
|
|
|
1072 // this object has a lightweight monitor and we have nothing more
|
|
|
1073 // to do here because the defaults are just fine.
|
|
|
1074 }
|
|
|
1075
|
|
|
1076 // we don't update return parameter unless everything worked
|
|
|
1077 *info_ptr = ret;
|
|
|
1078
|
|
|
1079 return JVMTI_ERROR_NONE;
|
|
|
1080 }
|
|
|
1081
|
|
|
1082 ResourceTracker::ResourceTracker(JvmtiEnv* env) {
|
|
|
1083 _env = env;
|
|
|
1084 _allocations = new (ResourceObj::C_HEAP) GrowableArray<unsigned char*>(20, true);
|
|
|
1085 _failed = false;
|
|
|
1086 }
|
|
|
1087 ResourceTracker::~ResourceTracker() {
|
|
|
1088 if (_failed) {
|
|
|
1089 for (int i=0; i<_allocations->length(); i++) {
|
|
|
1090 _env->deallocate(_allocations->at(i));
|
|
|
1091 }
|
|
|
1092 }
|
|
|
1093 delete _allocations;
|
|
|
1094 }
|
|
|
1095
|
|
|
1096 jvmtiError ResourceTracker::allocate(jlong size, unsigned char** mem_ptr) {
|
|
|
1097 unsigned char *ptr;
|
|
|
1098 jvmtiError err = _env->allocate(size, &ptr);
|
|
|
1099 if (err == JVMTI_ERROR_NONE) {
|
|
|
1100 _allocations->append(ptr);
|
|
|
1101 *mem_ptr = ptr;
|
|
|
1102 } else {
|
|
|
1103 *mem_ptr = NULL;
|
|
|
1104 _failed = true;
|
|
|
1105 }
|
|
|
1106 return err;
|
|
|
1107 }
|
|
|
1108
|
|
|
1109 unsigned char* ResourceTracker::allocate(jlong size) {
|
|
|
1110 unsigned char* ptr;
|
|
|
1111 allocate(size, &ptr);
|
|
|
1112 return ptr;
|
|
|
1113 }
|
|
|
1114
|
|
|
1115 char* ResourceTracker::strdup(const char* str) {
|
|
|
1116 char *dup_str = (char*)allocate(strlen(str)+1);
|
|
|
1117 if (dup_str != NULL) {
|
|
|
1118 strcpy(dup_str, str);
|
|
|
1119 }
|
|
|
1120 return dup_str;
|
|
|
1121 }
|
|
|
1122
|
|
|
1123 struct StackInfoNode {
|
|
|
1124 struct StackInfoNode *next;
|
|
|
1125 jvmtiStackInfo info;
|
|
|
1126 };
|
|
|
1127
|
|
|
1128 // Create a jvmtiStackInfo inside a linked list node and create a
|
|
|
1129 // buffer for the frame information, both allocated as resource objects.
|
|
|
1130 // Fill in both the jvmtiStackInfo and the jvmtiFrameInfo.
|
|
|
1131 // Note that either or both of thr and thread_oop
|
|
|
1132 // may be null if the thread is new or has exited.
|
|
|
1133 void
|
|
|
1134 VM_GetMultipleStackTraces::fill_frames(jthread jt, JavaThread *thr, oop thread_oop) {
|
|
|
1135 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
|
1136
|
|
|
1137 jint state = 0;
|
|
|
1138 struct StackInfoNode *node = NEW_RESOURCE_OBJ(struct StackInfoNode);
|
|
|
1139 jvmtiStackInfo *infop = &(node->info);
|
|
|
1140 node->next = head();
|
|
|
1141 set_head(node);
|
|
|
1142 infop->frame_count = 0;
|
|
|
1143 infop->thread = jt;
|
|
|
1144
|
|
|
1145 if (thread_oop != NULL) {
|
|
|
1146 // get most state bits
|
|
|
1147 state = (jint)java_lang_Thread::get_thread_status(thread_oop);
|
|
|
1148 }
|
|
|
1149
|
|
|
1150 if (thr != NULL) { // add more state bits if there is a JavaThead to query
|
|
|
1151 // same as is_being_ext_suspended() but without locking
|
|
|
1152 if (thr->is_ext_suspended() || thr->is_external_suspend()) {
|
|
|
1153 state |= JVMTI_THREAD_STATE_SUSPENDED;
|
|
|
1154 }
|
|
|
1155 JavaThreadState jts = thr->thread_state();
|
|
|
1156 if (jts == _thread_in_native) {
|
|
|
1157 state |= JVMTI_THREAD_STATE_IN_NATIVE;
|
|
|
1158 }
|
|
|
1159 OSThread* osThread = thr->osthread();
|
|
|
1160 if (osThread != NULL && osThread->interrupted()) {
|
|
|
1161 state |= JVMTI_THREAD_STATE_INTERRUPTED;
|
|
|
1162 }
|
|
|
1163 }
|
|
|
1164 infop->state = state;
|
|
|
1165
|
|
|
1166 if (thr != NULL || (state & JVMTI_THREAD_STATE_ALIVE) != 0) {
|
|
|
1167 infop->frame_buffer = NEW_RESOURCE_ARRAY(jvmtiFrameInfo, max_frame_count());
|
|
|
1168 env()->get_stack_trace(thr, 0, max_frame_count(),
|
|
|
1169 infop->frame_buffer, &(infop->frame_count));
|
|
|
1170 } else {
|
|
|
1171 infop->frame_buffer = NULL;
|
|
|
1172 infop->frame_count = 0;
|
|
|
1173 }
|
|
|
1174 _frame_count_total += infop->frame_count;
|
|
|
1175 }
|
|
|
1176
|
|
|
1177 // Based on the stack information in the linked list, allocate memory
|
|
|
1178 // block to return and fill it from the info in the linked list.
|
|
|
1179 void
|
|
|
1180 VM_GetMultipleStackTraces::allocate_and_fill_stacks(jint thread_count) {
|
|
|
1181 // do I need to worry about alignment issues?
|
|
|
1182 jlong alloc_size = thread_count * sizeof(jvmtiStackInfo)
|
|
|
1183 + _frame_count_total * sizeof(jvmtiFrameInfo);
|
|
|
1184 env()->allocate(alloc_size, (unsigned char **)&_stack_info);
|
|
|
1185
|
|
|
1186 // pointers to move through the newly allocated space as it is filled in
|
|
|
1187 jvmtiStackInfo *si = _stack_info + thread_count; // bottom of stack info
|
|
|
1188 jvmtiFrameInfo *fi = (jvmtiFrameInfo *)si; // is the top of frame info
|
|
|
1189
|
|
|
1190 // copy information in resource area into allocated buffer
|
|
|
1191 // insert stack info backwards since linked list is backwards
|
|
|
1192 // insert frame info forwards
|
|
|
1193 // walk the StackInfoNodes
|
|
|
1194 for (struct StackInfoNode *sin = head(); sin != NULL; sin = sin->next) {
|
|
|
1195 jint frame_count = sin->info.frame_count;
|
|
|
1196 size_t frames_size = frame_count * sizeof(jvmtiFrameInfo);
|
|
|
1197 --si;
|
|
|
1198 memcpy(si, &(sin->info), sizeof(jvmtiStackInfo));
|
|
|
1199 if (frames_size == 0) {
|
|
|
1200 si->frame_buffer = NULL;
|
|
|
1201 } else {
|
|
|
1202 memcpy(fi, sin->info.frame_buffer, frames_size);
|
|
|
1203 si->frame_buffer = fi; // point to the new allocated copy of the frames
|
|
|
1204 fi += frame_count;
|
|
|
1205 }
|
|
|
1206 }
|
|
|
1207 assert(si == _stack_info, "the last copied stack info must be the first record");
|
|
|
1208 assert((unsigned char *)fi == ((unsigned char *)_stack_info) + alloc_size,
|
|
|
1209 "the last copied frame info must be the last record");
|
|
|
1210 }
|
|
|
1211
|
|
|
1212
|
|
|
1213 void
|
|
|
1214 VM_GetThreadListStackTraces::doit() {
|
|
|
1215 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
|
1216
|
|
|
1217 ResourceMark rm;
|
|
|
1218 for (int i = 0; i < _thread_count; ++i) {
|
|
|
1219 jthread jt = _thread_list[i];
|
|
|
1220 oop thread_oop = JNIHandles::resolve_external_guard(jt);
|
|
|
1221 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::thread_klass())) {
|
|
|
1222 set_result(JVMTI_ERROR_INVALID_THREAD);
|
|
|
1223 return;
|
|
|
1224 }
|
|
|
1225 fill_frames(jt, java_lang_Thread::thread(thread_oop), thread_oop);
|
|
|
1226 }
|
|
|
1227 allocate_and_fill_stacks(_thread_count);
|
|
|
1228 }
|
|
|
1229
|
|
|
1230 void
|
|
|
1231 VM_GetAllStackTraces::doit() {
|
|
|
1232 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
|
|
|
1233
|
|
|
1234 ResourceMark rm;
|
|
|
1235 _final_thread_count = 0;
|
|
|
1236 for (JavaThread *jt = Threads::first(); jt != NULL; jt = jt->next()) {
|
|
|
1237 oop thread_oop = jt->threadObj();
|
|
|
1238 if (thread_oop != NULL &&
|
|
|
1239 !jt->is_exiting() &&
|
|
|
1240 java_lang_Thread::is_alive(thread_oop) &&
|
|
|
1241 !jt->is_hidden_from_external_view()) {
|
|
|
1242 ++_final_thread_count;
|
|
|
1243 // Handle block of the calling thread is used to create local refs.
|
|
|
1244 fill_frames((jthread)JNIHandles::make_local(_calling_thread, thread_oop),
|
|
|
1245 jt, thread_oop);
|
|
|
1246 }
|
|
|
1247 }
|
|
|
1248 allocate_and_fill_stacks(_final_thread_count);
|
|
|
1249 }
|
|
|
1250
|
|
|
1251 // Verifies that the top frame is a java frame in an expected state.
|
|
|
1252 // Deoptimizes frame if needed.
|
|
|
1253 // Checks that the frame method signature matches the return type (tos).
|
|
|
1254 // HandleMark must be defined in the caller only.
|
|
|
1255 // It is to keep a ret_ob_h handle alive after return to the caller.
|
|
|
1256 jvmtiError
|
|
|
1257 JvmtiEnvBase::check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
|
|
|
1258 jvalue value, TosState tos, Handle* ret_ob_h) {
|
|
|
1259 ResourceMark rm(current_thread);
|
|
|
1260
|
|
|
1261 vframe *vf = vframeFor(java_thread, 0);
|
|
|
1262 NULL_CHECK(vf, JVMTI_ERROR_NO_MORE_FRAMES);
|
|
|
1263
|
|
|
1264 javaVFrame *jvf = (javaVFrame*) vf;
|
|
|
1265 if (!vf->is_java_frame() || jvf->method()->is_native()) {
|
|
|
1266 return JVMTI_ERROR_OPAQUE_FRAME;
|
|
|
1267 }
|
|
|
1268
|
|
|
1269 // If the frame is a compiled one, need to deoptimize it.
|
|
|
1270 if (vf->is_compiled_frame()) {
|
|
|
1271 if (!vf->fr().can_be_deoptimized()) {
|
|
|
1272 return JVMTI_ERROR_OPAQUE_FRAME;
|
|
|
1273 }
|
|
|
1274 VM_DeoptimizeFrame deopt(java_thread, jvf->fr().id());
|
|
|
1275 VMThread::execute(&deopt);
|
|
|
1276 }
|
|
|
1277
|
|
|
1278 // Get information about method return type
|
|
|
1279 symbolHandle signature(current_thread, jvf->method()->signature());
|
|
|
1280
|
|
|
1281 ResultTypeFinder rtf(signature);
|
|
|
1282 TosState fr_tos = as_TosState(rtf.type());
|
|
|
1283 if (fr_tos != tos) {
|
|
|
1284 if (tos != itos || (fr_tos != btos && fr_tos != ctos && fr_tos != stos)) {
|
|
|
1285 return JVMTI_ERROR_TYPE_MISMATCH;
|
|
|
1286 }
|
|
|
1287 }
|
|
|
1288
|
|
|
1289 // Check that the jobject class matches the return type signature.
|
|
|
1290 jobject jobj = value.l;
|
|
|
1291 if (tos == atos && jobj != NULL) { // NULL reference is allowed
|
|
|
1292 Handle ob_h = Handle(current_thread, JNIHandles::resolve_external_guard(jobj));
|
|
|
1293 NULL_CHECK(ob_h, JVMTI_ERROR_INVALID_OBJECT);
|
|
|
1294 KlassHandle ob_kh = KlassHandle(current_thread, ob_h()->klass());
|
|
|
1295 NULL_CHECK(ob_kh, JVMTI_ERROR_INVALID_OBJECT);
|
|
|
1296
|
|
|
1297 // Method return type signature.
|
|
|
1298 char* ty_sign = 1 + strchr(signature->as_C_string(), ')');
|
|
|
1299
|
|
|
1300 if (!VM_GetOrSetLocal::is_assignable(ty_sign, Klass::cast(ob_kh()), current_thread)) {
|
|
|
1301 return JVMTI_ERROR_TYPE_MISMATCH;
|
|
|
1302 }
|
|
|
1303 *ret_ob_h = ob_h;
|
|
|
1304 }
|
|
|
1305 return JVMTI_ERROR_NONE;
|
|
|
1306 } /* end check_top_frame */
|
|
|
1307
|
|
|
1308
|
|
|
1309 // ForceEarlyReturn<type> follows the PopFrame approach in many aspects.
|
|
|
1310 // Main difference is on the last stage in the interpreter.
|
|
|
1311 // The PopFrame stops method execution to continue execution
|
|
|
1312 // from the same method call instruction.
|
|
|
1313 // The ForceEarlyReturn forces return from method so the execution
|
|
|
1314 // continues at the bytecode following the method call.
|
|
|
1315
|
|
|
1316 // Threads_lock NOT held, java_thread not protected by lock
|
|
|
1317 // java_thread - pre-checked
|
|
|
1318
|
|
|
1319 jvmtiError
|
|
|
1320 JvmtiEnvBase::force_early_return(JavaThread* java_thread, jvalue value, TosState tos) {
|
|
|
1321 JavaThread* current_thread = JavaThread::current();
|
|
|
1322 HandleMark hm(current_thread);
|
|
|
1323 uint32_t debug_bits = 0;
|
|
|
1324
|
|
|
1325 // Check if java_thread is fully suspended
|
|
|
1326 if (!is_thread_fully_suspended(java_thread,
|
|
|
1327 true /* wait for suspend completion */,
|
|
|
1328 &debug_bits)) {
|
|
|
1329 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
|
|
|
1330 }
|
|
|
1331
|
|
|
1332 // retreive or create the state
|
|
|
1333 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
|
|
|
1334
|
|
|
1335 // Check to see if a ForceEarlyReturn was already in progress
|
|
|
1336 if (state->is_earlyret_pending()) {
|
|
|
1337 // Probably possible for JVMTI clients to trigger this, but the
|
|
|
1338 // JPDA backend shouldn't allow this to happen
|
|
|
1339 return JVMTI_ERROR_INTERNAL;
|
|
|
1340 }
|
|
|
1341 {
|
|
|
1342 // The same as for PopFrame. Workaround bug:
|
|
|
1343 // 4812902: popFrame hangs if the method is waiting at a synchronize
|
|
|
1344 // Catch this condition and return an error to avoid hanging.
|
|
|
1345 // Now JVMTI spec allows an implementation to bail out with an opaque
|
|
|
1346 // frame error.
|
|
|
1347 OSThread* osThread = java_thread->osthread();
|
|
|
1348 if (osThread->get_state() == MONITOR_WAIT) {
|
|
|
1349 return JVMTI_ERROR_OPAQUE_FRAME;
|
|
|
1350 }
|
|
|
1351 }
|
|
|
1352 Handle ret_ob_h = Handle();
|
|
|
1353 jvmtiError err = check_top_frame(current_thread, java_thread, value, tos, &ret_ob_h);
|
|
|
1354 if (err != JVMTI_ERROR_NONE) {
|
|
|
1355 return err;
|
|
|
1356 }
|
|
|
1357 assert(tos != atos || value.l == NULL || ret_ob_h() != NULL,
|
|
|
1358 "return object oop must not be NULL if jobject is not NULL");
|
|
|
1359
|
|
|
1360 // Update the thread state to reflect that the top frame must be
|
|
|
1361 // forced to return.
|
|
|
1362 // The current frame will be returned later when the suspended
|
|
|
1363 // thread is resumed and right before returning from VM to Java.
|
|
|
1364 // (see call_VM_base() in assembler_<cpu>.cpp).
|
|
|
1365
|
|
|
1366 state->set_earlyret_pending();
|
|
|
1367 state->set_earlyret_oop(ret_ob_h());
|
|
|
1368 state->set_earlyret_value(value, tos);
|
|
|
1369
|
|
|
1370 // Set pending step flag for this early return.
|
|
|
1371 // It is cleared when next step event is posted.
|
|
|
1372 state->set_pending_step_for_earlyret();
|
|
|
1373
|
|
|
1374 return JVMTI_ERROR_NONE;
|
|
|
1375 } /* end force_early_return */
|
|
|
1376
|
|
|
1377 void
|
|
|
1378 JvmtiMonitorClosure::do_monitor(ObjectMonitor* mon) {
|
|
|
1379 if ( _error != JVMTI_ERROR_NONE) {
|
|
|
1380 // Error occurred in previous iteration so no need to add
|
|
|
1381 // to the list.
|
|
|
1382 return;
|
|
|
1383 }
|
|
|
1384 if (mon->owner() == _java_thread ) {
|
|
|
1385 // Filter out on stack monitors collected during stack walk.
|
|
|
1386 oop obj = (oop)mon->object();
|
|
|
1387 bool found = false;
|
|
|
1388 for (int j = 0; j < _owned_monitors_list->length(); j++) {
|
|
|
1389 jobject jobj = ((jvmtiMonitorStackDepthInfo*)_owned_monitors_list->at(j))->monitor;
|
|
|
1390 oop check = JNIHandles::resolve(jobj);
|
|
|
1391 if (check == obj) {
|
|
|
1392 // On stack monitor already collected during the stack walk.
|
|
|
1393 found = true;
|
|
|
1394 break;
|
|
|
1395 }
|
|
|
1396 }
|
|
|
1397 if (found == false) {
|
|
|
1398 // This is off stack monitor (e.g. acquired via jni MonitorEnter).
|
|
|
1399 jvmtiError err;
|
|
|
1400 jvmtiMonitorStackDepthInfo *jmsdi;
|
|
|
1401 err = _env->allocate(sizeof(jvmtiMonitorStackDepthInfo), (unsigned char **)&jmsdi);
|
|
|
1402 if (err != JVMTI_ERROR_NONE) {
|
|
|
1403 _error = err;
|
|
|
1404 return;
|
|
|
1405 }
|
|
|
1406 Handle hobj(obj);
|
|
|
1407 jmsdi->monitor = _env->jni_reference(_calling_thread, hobj);
|
|
|
1408 // stack depth is unknown for this monitor.
|
|
|
1409 jmsdi->stack_depth = -1;
|
|
|
1410 _owned_monitors_list->append(jmsdi);
|
|
|
1411 }
|
|
|
1412 }
|
|
|
1413 }
|
|
|
1414
|
|
|
1415 #endif // !JVMTI_KERNEL
|
