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1 /* |
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2 * Copyright 1998-2007 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 |
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25 # include "incls/_precompiled.incl" |
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26 # include "incls/_jniHandles.cpp.incl" |
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27 |
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28 |
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29 JNIHandleBlock* JNIHandles::_global_handles = NULL; |
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30 JNIHandleBlock* JNIHandles::_weak_global_handles = NULL; |
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31 oop JNIHandles::_deleted_handle = NULL; |
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32 |
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33 |
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34 jobject JNIHandles::make_local(oop obj) { |
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35 if (obj == NULL) { |
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36 return NULL; // ignore null handles |
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37 } else { |
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38 Thread* thread = Thread::current(); |
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39 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); |
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40 return thread->active_handles()->allocate_handle(obj); |
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41 } |
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42 } |
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43 |
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44 |
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45 // optimized versions |
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46 |
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47 jobject JNIHandles::make_local(Thread* thread, oop obj) { |
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48 if (obj == NULL) { |
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49 return NULL; // ignore null handles |
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50 } else { |
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51 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); |
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52 return thread->active_handles()->allocate_handle(obj); |
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53 } |
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54 } |
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55 |
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56 |
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57 jobject JNIHandles::make_local(JNIEnv* env, oop obj) { |
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58 if (obj == NULL) { |
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59 return NULL; // ignore null handles |
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60 } else { |
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61 JavaThread* thread = JavaThread::thread_from_jni_environment(env); |
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62 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); |
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63 return thread->active_handles()->allocate_handle(obj); |
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64 } |
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65 } |
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66 |
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67 |
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68 jobject JNIHandles::make_global(Handle obj) { |
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69 jobject res = NULL; |
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70 if (!obj.is_null()) { |
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71 // ignore null handles |
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72 MutexLocker ml(JNIGlobalHandle_lock); |
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73 assert(Universe::heap()->is_in_reserved(obj()), "sanity check"); |
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74 res = _global_handles->allocate_handle(obj()); |
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75 } else { |
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76 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); |
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77 } |
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78 |
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79 return res; |
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80 } |
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81 |
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82 |
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83 jobject JNIHandles::make_weak_global(Handle obj) { |
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84 jobject res = NULL; |
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85 if (!obj.is_null()) { |
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86 // ignore null handles |
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87 MutexLocker ml(JNIGlobalHandle_lock); |
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88 assert(Universe::heap()->is_in_reserved(obj()), "sanity check"); |
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89 res = _weak_global_handles->allocate_handle(obj()); |
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90 } else { |
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91 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); |
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92 } |
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93 return res; |
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94 } |
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95 |
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96 jmethodID JNIHandles::make_jmethod_id(methodHandle mh) { |
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97 return (jmethodID) make_weak_global(mh); |
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98 } |
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99 |
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100 |
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101 |
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102 void JNIHandles::change_method_associated_with_jmethod_id(jmethodID jmid, methodHandle mh) { |
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103 MutexLocker ml(JNIGlobalHandle_lock); // Is this necessary? |
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104 Handle obj = (Handle)mh; |
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105 oop* jobj = (oop*)jmid; |
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106 *jobj = obj(); |
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107 } |
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108 |
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109 |
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110 void JNIHandles::destroy_global(jobject handle) { |
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111 if (handle != NULL) { |
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112 assert(is_global_handle(handle), "Invalid delete of global JNI handle"); |
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113 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it |
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114 } |
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115 } |
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116 |
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117 |
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118 void JNIHandles::destroy_weak_global(jobject handle) { |
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119 if (handle != NULL) { |
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120 assert(!CheckJNICalls || is_weak_global_handle(handle), "Invalid delete of weak global JNI handle"); |
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121 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it |
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122 } |
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123 } |
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124 |
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125 void JNIHandles::destroy_jmethod_id(jmethodID mid) { |
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126 destroy_weak_global((jobject)mid); |
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127 } |
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128 |
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129 |
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130 void JNIHandles::oops_do(OopClosure* f) { |
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131 f->do_oop(&_deleted_handle); |
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132 _global_handles->oops_do(f); |
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133 } |
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134 |
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135 |
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136 void JNIHandles::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) { |
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137 _weak_global_handles->weak_oops_do(is_alive, f); |
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138 } |
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139 |
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140 |
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141 void JNIHandles::initialize() { |
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142 _global_handles = JNIHandleBlock::allocate_block(); |
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143 _weak_global_handles = JNIHandleBlock::allocate_block(); |
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144 EXCEPTION_MARK; |
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145 // We will never reach the CATCH below since Exceptions::_throw will cause |
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146 // the VM to exit if an exception is thrown during initialization |
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147 klassOop k = SystemDictionary::object_klass(); |
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148 _deleted_handle = instanceKlass::cast(k)->allocate_permanent_instance(CATCH); |
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149 } |
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150 |
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151 |
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152 bool JNIHandles::is_local_handle(Thread* thread, jobject handle) { |
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153 JNIHandleBlock* block = thread->active_handles(); |
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154 |
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155 // Look back past possible native calls to jni_PushLocalFrame. |
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156 while (block != NULL) { |
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157 if (block->chain_contains(handle)) { |
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158 return true; |
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159 } |
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160 block = block->pop_frame_link(); |
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161 } |
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162 return false; |
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163 } |
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164 |
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165 |
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166 // Determine if the handle is somewhere in the current thread's stack. |
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167 // We easily can't isolate any particular stack frame the handle might |
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168 // come from, so we'll check the whole stack. |
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169 |
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170 bool JNIHandles::is_frame_handle(JavaThread* thr, jobject obj) { |
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171 // If there is no java frame, then this must be top level code, such |
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172 // as the java command executable, in which case, this type of handle |
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173 // is not permitted. |
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174 return (thr->has_last_Java_frame() && |
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175 (void*)obj < (void*)thr->stack_base() && |
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176 (void*)obj >= (void*)thr->last_Java_sp()); |
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177 } |
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178 |
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179 |
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180 bool JNIHandles::is_global_handle(jobject handle) { |
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181 return _global_handles->chain_contains(handle); |
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182 } |
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183 |
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184 |
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185 bool JNIHandles::is_weak_global_handle(jobject handle) { |
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186 return _weak_global_handles->chain_contains(handle); |
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187 } |
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188 |
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189 long JNIHandles::global_handle_memory_usage() { |
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190 return _global_handles->memory_usage(); |
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191 } |
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192 |
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193 long JNIHandles::weak_global_handle_memory_usage() { |
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194 return _weak_global_handles->memory_usage(); |
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195 } |
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196 |
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197 |
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198 class AlwaysAliveClosure: public BoolObjectClosure { |
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199 public: |
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200 bool do_object_b(oop obj) { return true; } |
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201 void do_object(oop obj) { assert(false, "Don't call"); } |
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202 }; |
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203 |
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204 class CountHandleClosure: public OopClosure { |
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205 private: |
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206 int _count; |
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207 public: |
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208 CountHandleClosure(): _count(0) {} |
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209 void do_oop(oop* unused) { |
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210 _count++; |
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211 } |
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212 int count() { return _count; } |
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213 }; |
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214 |
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215 // We assume this is called at a safepoint: no lock is needed. |
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216 void JNIHandles::print_on(outputStream* st) { |
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217 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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218 assert(_global_handles != NULL && _weak_global_handles != NULL, |
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219 "JNIHandles not initialized"); |
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220 |
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221 CountHandleClosure global_handle_count; |
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222 AlwaysAliveClosure always_alive; |
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223 oops_do(&global_handle_count); |
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224 weak_oops_do(&always_alive, &global_handle_count); |
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225 |
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226 st->print_cr("JNI global references: %d", global_handle_count.count()); |
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227 st->cr(); |
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228 st->flush(); |
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229 } |
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230 |
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231 class VerifyHandleClosure: public OopClosure { |
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232 public: |
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233 void do_oop(oop* root) { |
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234 (*root)->verify(); |
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235 } |
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236 }; |
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237 |
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238 void JNIHandles::verify() { |
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239 VerifyHandleClosure verify_handle; |
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240 AlwaysAliveClosure always_alive; |
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241 |
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242 oops_do(&verify_handle); |
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243 weak_oops_do(&always_alive, &verify_handle); |
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244 } |
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245 |
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246 |
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247 |
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248 void jni_handles_init() { |
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249 JNIHandles::initialize(); |
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250 } |
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251 |
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252 |
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253 int JNIHandleBlock::_blocks_allocated = 0; |
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254 JNIHandleBlock* JNIHandleBlock::_block_free_list = NULL; |
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255 #ifndef PRODUCT |
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256 JNIHandleBlock* JNIHandleBlock::_block_list = NULL; |
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257 #endif |
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258 |
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259 |
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260 void JNIHandleBlock::zap() { |
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261 // Zap block values |
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262 _top = 0; |
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263 for (int index = 0; index < block_size_in_oops; index++) { |
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264 _handles[index] = badJNIHandle; |
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265 } |
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266 } |
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267 |
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268 JNIHandleBlock* JNIHandleBlock::allocate_block(Thread* thread) { |
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269 assert(thread == NULL || thread == Thread::current(), "sanity check"); |
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270 JNIHandleBlock* block; |
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271 // Check the thread-local free list for a block so we don't |
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272 // have to acquire a mutex. |
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273 if (thread != NULL && thread->free_handle_block() != NULL) { |
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274 block = thread->free_handle_block(); |
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275 thread->set_free_handle_block(block->_next); |
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276 } |
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277 else { |
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278 // locking with safepoint checking introduces a potential deadlock: |
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279 // - we would hold JNIHandleBlockFreeList_lock and then Threads_lock |
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280 // - another would hold Threads_lock (jni_AttachCurrentThread) and then |
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281 // JNIHandleBlockFreeList_lock (JNIHandleBlock::allocate_block) |
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282 MutexLockerEx ml(JNIHandleBlockFreeList_lock, |
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283 Mutex::_no_safepoint_check_flag); |
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284 if (_block_free_list == NULL) { |
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285 // Allocate new block |
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286 block = new JNIHandleBlock(); |
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287 _blocks_allocated++; |
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288 if (TraceJNIHandleAllocation) { |
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289 tty->print_cr("JNIHandleBlock " INTPTR_FORMAT " allocated (%d total blocks)", |
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290 block, _blocks_allocated); |
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291 } |
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292 if (ZapJNIHandleArea) block->zap(); |
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293 #ifndef PRODUCT |
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294 // Link new block to list of all allocated blocks |
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295 block->_block_list_link = _block_list; |
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296 _block_list = block; |
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297 #endif |
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298 } else { |
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299 // Get block from free list |
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300 block = _block_free_list; |
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301 _block_free_list = _block_free_list->_next; |
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302 } |
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303 } |
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304 block->_top = 0; |
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305 block->_next = NULL; |
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306 block->_pop_frame_link = NULL; |
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307 // _last, _free_list & _allocate_before_rebuild initialized in allocate_handle |
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308 debug_only(block->_last = NULL); |
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309 debug_only(block->_free_list = NULL); |
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310 debug_only(block->_allocate_before_rebuild = -1); |
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311 return block; |
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312 } |
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313 |
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314 |
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315 void JNIHandleBlock::release_block(JNIHandleBlock* block, Thread* thread) { |
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316 assert(thread == NULL || thread == Thread::current(), "sanity check"); |
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317 JNIHandleBlock* pop_frame_link = block->pop_frame_link(); |
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318 // Put returned block at the beginning of the thread-local free list. |
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319 // Note that if thread == NULL, we use it as an implicit argument that |
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320 // we _don't_ want the block to be kept on the free_handle_block. |
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321 // See for instance JavaThread::exit(). |
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322 if (thread != NULL ) { |
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323 if (ZapJNIHandleArea) block->zap(); |
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324 JNIHandleBlock* freelist = thread->free_handle_block(); |
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325 block->_pop_frame_link = NULL; |
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326 thread->set_free_handle_block(block); |
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327 |
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328 // Add original freelist to end of chain |
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329 if ( freelist != NULL ) { |
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330 while ( block->_next != NULL ) block = block->_next; |
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331 block->_next = freelist; |
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332 } |
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333 block = NULL; |
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334 } |
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335 if (block != NULL) { |
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336 // Return blocks to free list |
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337 // locking with safepoint checking introduces a potential deadlock: |
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338 // - we would hold JNIHandleBlockFreeList_lock and then Threads_lock |
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339 // - another would hold Threads_lock (jni_AttachCurrentThread) and then |
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340 // JNIHandleBlockFreeList_lock (JNIHandleBlock::allocate_block) |
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341 MutexLockerEx ml(JNIHandleBlockFreeList_lock, |
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342 Mutex::_no_safepoint_check_flag); |
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343 while (block != NULL) { |
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344 if (ZapJNIHandleArea) block->zap(); |
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345 JNIHandleBlock* next = block->_next; |
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346 block->_next = _block_free_list; |
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347 _block_free_list = block; |
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348 block = next; |
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349 } |
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350 } |
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351 if (pop_frame_link != NULL) { |
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352 // As a sanity check we release blocks pointed to by the pop_frame_link. |
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353 // This should never happen (only if PopLocalFrame is not called the |
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354 // correct number of times). |
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355 release_block(pop_frame_link, thread); |
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356 } |
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357 } |
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358 |
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359 |
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360 void JNIHandleBlock::oops_do(OopClosure* f) { |
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361 JNIHandleBlock* current_chain = this; |
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362 // Iterate over chain of blocks, followed by chains linked through the |
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363 // pop frame links. |
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364 while (current_chain != NULL) { |
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365 for (JNIHandleBlock* current = current_chain; current != NULL; |
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366 current = current->_next) { |
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367 assert(current == current_chain || current->pop_frame_link() == NULL, |
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368 "only blocks first in chain should have pop frame link set"); |
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369 for (int index = 0; index < current->_top; index++) { |
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370 oop* root = &(current->_handles)[index]; |
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371 oop value = *root; |
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372 // traverse heap pointers only, not deleted handles or free list |
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373 // pointers |
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374 if (value != NULL && Universe::heap()->is_in_reserved(value)) { |
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375 f->do_oop(root); |
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376 } |
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377 } |
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378 // the next handle block is valid only if current block is full |
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379 if (current->_top < block_size_in_oops) { |
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380 break; |
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381 } |
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382 } |
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383 current_chain = current_chain->pop_frame_link(); |
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384 } |
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385 } |
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386 |
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387 |
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388 void JNIHandleBlock::weak_oops_do(BoolObjectClosure* is_alive, |
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389 OopClosure* f) { |
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390 for (JNIHandleBlock* current = this; current != NULL; current = current->_next) { |
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391 assert(current->pop_frame_link() == NULL, |
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392 "blocks holding weak global JNI handles should not have pop frame link set"); |
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393 for (int index = 0; index < current->_top; index++) { |
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394 oop* root = &(current->_handles)[index]; |
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395 oop value = *root; |
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396 // traverse heap pointers only, not deleted handles or free list pointers |
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397 if (value != NULL && Universe::heap()->is_in_reserved(value)) { |
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398 if (is_alive->do_object_b(value)) { |
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399 // The weakly referenced object is alive, update pointer |
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400 f->do_oop(root); |
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401 } else { |
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402 // The weakly referenced object is not alive, clear the reference by storing NULL |
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403 if (TraceReferenceGC) { |
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404 tty->print_cr("Clearing JNI weak reference (" INTPTR_FORMAT ")", root); |
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405 } |
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406 *root = NULL; |
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407 } |
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408 } |
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409 } |
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410 // the next handle block is valid only if current block is full |
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411 if (current->_top < block_size_in_oops) { |
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412 break; |
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413 } |
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414 } |
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415 } |
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416 |
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417 |
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418 jobject JNIHandleBlock::allocate_handle(oop obj) { |
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419 assert(Universe::heap()->is_in_reserved(obj), "sanity check"); |
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420 if (_top == 0) { |
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421 // This is the first allocation or the initial block got zapped when |
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422 // entering a native function. If we have any following blocks they are |
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423 // not valid anymore. |
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424 for (JNIHandleBlock* current = _next; current != NULL; |
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425 current = current->_next) { |
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426 assert(current->_last == NULL, "only first block should have _last set"); |
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427 assert(current->_free_list == NULL, |
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428 "only first block should have _free_list set"); |
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429 current->_top = 0; |
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430 if (ZapJNIHandleArea) current->zap(); |
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431 } |
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432 // Clear initial block |
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433 _free_list = NULL; |
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434 _allocate_before_rebuild = 0; |
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435 _last = this; |
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436 if (ZapJNIHandleArea) zap(); |
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437 } |
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438 |
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439 // Try last block |
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440 if (_last->_top < block_size_in_oops) { |
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441 oop* handle = &(_last->_handles)[_last->_top++]; |
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442 *handle = obj; |
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443 return (jobject) handle; |
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444 } |
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445 |
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446 // Try free list |
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447 if (_free_list != NULL) { |
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448 oop* handle = _free_list; |
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449 _free_list = (oop*) *_free_list; |
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450 *handle = obj; |
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451 return (jobject) handle; |
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452 } |
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453 // Check if unused block follow last |
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454 if (_last->_next != NULL) { |
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455 // update last and retry |
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456 _last = _last->_next; |
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457 return allocate_handle(obj); |
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458 } |
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459 |
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460 // No space available, we have to rebuild free list or expand |
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461 if (_allocate_before_rebuild == 0) { |
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462 rebuild_free_list(); // updates _allocate_before_rebuild counter |
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463 } else { |
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464 // Append new block |
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465 Thread* thread = Thread::current(); |
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466 Handle obj_handle(thread, obj); |
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467 // This can block, so we need to preserve obj accross call. |
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468 _last->_next = JNIHandleBlock::allocate_block(thread); |
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469 _last = _last->_next; |
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470 _allocate_before_rebuild--; |
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471 obj = obj_handle(); |
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472 } |
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473 return allocate_handle(obj); // retry |
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474 } |
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475 |
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476 |
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477 void JNIHandleBlock::rebuild_free_list() { |
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478 assert(_allocate_before_rebuild == 0 && _free_list == NULL, "just checking"); |
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479 int free = 0; |
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480 int blocks = 0; |
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481 for (JNIHandleBlock* current = this; current != NULL; current = current->_next) { |
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482 for (int index = 0; index < current->_top; index++) { |
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483 oop* handle = &(current->_handles)[index]; |
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484 if (*handle == JNIHandles::deleted_handle()) { |
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485 // this handle was cleared out by a delete call, reuse it |
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486 *handle = (oop) _free_list; |
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487 _free_list = handle; |
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488 free++; |
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489 } |
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490 } |
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491 // we should not rebuild free list if there are unused handles at the end |
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492 assert(current->_top == block_size_in_oops, "just checking"); |
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493 blocks++; |
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494 } |
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495 // Heuristic: if more than half of the handles are free we rebuild next time |
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496 // as well, otherwise we append a corresponding number of new blocks before |
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497 // attempting a free list rebuild again. |
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498 int total = blocks * block_size_in_oops; |
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499 int extra = total - 2*free; |
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500 if (extra > 0) { |
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501 // Not as many free handles as we would like - compute number of new blocks to append |
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502 _allocate_before_rebuild = (extra + block_size_in_oops - 1) / block_size_in_oops; |
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503 } |
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504 if (TraceJNIHandleAllocation) { |
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505 tty->print_cr("Rebuild free list JNIHandleBlock " INTPTR_FORMAT " blocks=%d used=%d free=%d add=%d", |
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506 this, blocks, total-free, free, _allocate_before_rebuild); |
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507 } |
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508 } |
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509 |
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510 |
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511 bool JNIHandleBlock::contains(jobject handle) const { |
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512 return ((jobject)&_handles[0] <= handle && handle<(jobject)&_handles[_top]); |
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513 } |
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514 |
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515 |
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516 bool JNIHandleBlock::chain_contains(jobject handle) const { |
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517 for (JNIHandleBlock* current = (JNIHandleBlock*) this; current != NULL; current = current->_next) { |
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518 if (current->contains(handle)) { |
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519 return true; |
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520 } |
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521 } |
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522 return false; |
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523 } |
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524 |
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525 |
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526 int JNIHandleBlock::length() const { |
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527 int result = 1; |
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528 for (JNIHandleBlock* current = _next; current != NULL; current = current->_next) { |
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529 result++; |
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530 } |
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531 return result; |
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532 } |
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533 |
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534 // This method is not thread-safe, i.e., must be called whule holding a lock on the |
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535 // structure. |
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536 long JNIHandleBlock::memory_usage() const { |
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537 return length() * sizeof(JNIHandleBlock); |
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538 } |
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539 |
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540 |
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541 #ifndef PRODUCT |
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542 |
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543 bool JNIHandleBlock::any_contains(jobject handle) { |
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544 for (JNIHandleBlock* current = _block_list; current != NULL; current = current->_block_list_link) { |
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545 if (current->contains(handle)) { |
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546 return true; |
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547 } |
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548 } |
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549 return false; |
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550 } |
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551 |
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552 void JNIHandleBlock::print_statistics() { |
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553 int used_blocks = 0; |
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554 int free_blocks = 0; |
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555 int used_handles = 0; |
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556 int free_handles = 0; |
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557 JNIHandleBlock* block = _block_list; |
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558 while (block != NULL) { |
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559 if (block->_top > 0) { |
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560 used_blocks++; |
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561 } else { |
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562 free_blocks++; |
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563 } |
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564 used_handles += block->_top; |
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565 free_handles += (block_size_in_oops - block->_top); |
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566 block = block->_block_list_link; |
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567 } |
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568 tty->print_cr("JNIHandleBlocks statistics"); |
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569 tty->print_cr("- blocks allocated: %d", used_blocks + free_blocks); |
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570 tty->print_cr("- blocks in use: %d", used_blocks); |
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571 tty->print_cr("- blocks free: %d", free_blocks); |
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572 tty->print_cr("- handles in use: %d", used_handles); |
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573 tty->print_cr("- handles free: %d", free_handles); |
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574 } |
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575 |
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576 #endif |