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1 /*
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2 * Copyright 2003-2005 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
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26 # include "incls/_precompiled.incl"
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27 # include "incls/_jvmtiGetLoadedClasses.cpp.incl"
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28
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29
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30 // The closure for GetLoadedClasses and GetClassLoaderClasses
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31 class JvmtiGetLoadedClassesClosure : public StackObj {
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32 // Since the SystemDictionary::classes_do callback
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33 // doesn't pass a closureData pointer,
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34 // we use a thread-local slot to hold a pointer to
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35 // a stack allocated instance of this structure.
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36 private:
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37 jobject _initiatingLoader;
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38 int _count;
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39 Handle* _list;
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40 int _index;
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41
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42 private:
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43 // Getting and setting the thread local pointer
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44 static JvmtiGetLoadedClassesClosure* get_this() {
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45 JvmtiGetLoadedClassesClosure* result = NULL;
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46 JavaThread* thread = JavaThread::current();
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47 result = thread->get_jvmti_get_loaded_classes_closure();
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48 return result;
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49 }
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50 static void set_this(JvmtiGetLoadedClassesClosure* that) {
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51 JavaThread* thread = JavaThread::current();
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52 thread->set_jvmti_get_loaded_classes_closure(that);
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53 }
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54
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55 public:
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56 // Constructor/Destructor
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57 JvmtiGetLoadedClassesClosure() {
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58 JvmtiGetLoadedClassesClosure* that = get_this();
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59 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use");
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60 _initiatingLoader = NULL;
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61 _count = 0;
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62 _list = NULL;
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63 _index = 0;
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64 set_this(this);
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65 }
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66
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67 JvmtiGetLoadedClassesClosure(jobject initiatingLoader) {
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68 JvmtiGetLoadedClassesClosure* that = get_this();
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69 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use");
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70 _initiatingLoader = initiatingLoader;
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71 _count = 0;
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72 _list = NULL;
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73 _index = 0;
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74 set_this(this);
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75 }
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76
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77 ~JvmtiGetLoadedClassesClosure() {
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78 JvmtiGetLoadedClassesClosure* that = get_this();
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79 assert(that != NULL, "JvmtiGetLoadedClassesClosure not found");
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80 set_this(NULL);
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81 _initiatingLoader = NULL;
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82 _count = 0;
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83 if (_list != NULL) {
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84 FreeHeap(_list);
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85 _list = NULL;
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86 }
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87 _index = 0;
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88 }
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89
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90 // Accessors.
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91 jobject get_initiatingLoader() {
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92 return _initiatingLoader;
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93 }
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94
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95 int get_count() {
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96 return _count;
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97 }
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98
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99 void set_count(int value) {
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100 _count = value;
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101 }
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102
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103 Handle* get_list() {
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104 return _list;
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105 }
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106
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107 void set_list(Handle* value) {
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108 _list = value;
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109 }
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110
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111 int get_index() {
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112 return _index;
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113 }
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114
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115 void set_index(int value) {
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116 _index = value;
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117 }
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118
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119 Handle get_element(int index) {
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120 if ((_list != NULL) && (index < _count)) {
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121 return _list[index];
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122 } else {
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123 assert(false, "empty get_element");
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124 return Handle();
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125 }
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126 }
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127
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128 void set_element(int index, Handle value) {
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129 if ((_list != NULL) && (index < _count)) {
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130 _list[index] = value;
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131 } else {
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132 assert(false, "bad set_element");
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133 }
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134 }
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135
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136 // Other predicates
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137 bool available() {
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138 return (_list != NULL);
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139 }
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140
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141 #ifdef ASSERT
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142 // For debugging.
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143 void check(int limit) {
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144 for (int i = 0; i < limit; i += 1) {
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145 assert(Universe::heap()->is_in(get_element(i)()), "check fails");
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146 }
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147 }
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148 #endif
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149
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150 // Public methods that get called within the scope of the closure
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151 void allocate() {
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152 _list = NEW_C_HEAP_ARRAY(Handle, _count);
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153 assert(_list != NULL, "Out of memory");
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154 if (_list == NULL) {
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155 _count = 0;
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156 }
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157 }
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158
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159 void extract(JvmtiEnv *env, jclass* result) {
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160 for (int index = 0; index < _count; index += 1) {
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161 result[index] = (jclass) env->jni_reference(get_element(index));
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162 }
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163 }
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164
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165 // Finally, the static methods that are the callbacks
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166 static void increment(klassOop k) {
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167 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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168 if (that->get_initiatingLoader() == NULL) {
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169 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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170 that->set_count(that->get_count() + 1);
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171 }
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172 } else if (k != NULL) {
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173 // if initiating loader not null, just include the instance with 1 dimension
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174 that->set_count(that->get_count() + 1);
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175 }
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176 }
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177
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178 static void increment_with_loader(klassOop k, oop loader) {
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179 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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180 if (loader == JNIHandles::resolve(that->get_initiatingLoader())) {
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181 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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182 that->set_count(that->get_count() + 1);
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183 }
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184 }
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185 }
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186
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187 static void prim_array_increment_with_loader(klassOop array, oop loader) {
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188 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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189 if (loader == JNIHandles::resolve(that->get_initiatingLoader())) {
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190 that->set_count(that->get_count() + 1);
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191 }
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192 }
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193
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194 static void add(klassOop k) {
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195 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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196 if (that->available()) {
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197 if (that->get_initiatingLoader() == NULL) {
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198 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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199 oop mirror = Klass::cast(l)->java_mirror();
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200 that->set_element(that->get_index(), mirror);
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201 that->set_index(that->get_index() + 1);
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202 }
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203 } else if (k != NULL) {
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204 // if initiating loader not null, just include the instance with 1 dimension
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205 oop mirror = Klass::cast(k)->java_mirror();
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206 that->set_element(that->get_index(), mirror);
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207 that->set_index(that->get_index() + 1);
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208 }
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209 }
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210 }
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211
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212 static void add_with_loader(klassOop k, oop loader) {
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213 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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214 if (that->available()) {
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215 if (loader == JNIHandles::resolve(that->get_initiatingLoader())) {
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216 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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217 oop mirror = Klass::cast(l)->java_mirror();
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218 that->set_element(that->get_index(), mirror);
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219 that->set_index(that->get_index() + 1);
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220 }
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221 }
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222 }
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223 }
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224
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225 // increment the count for the given basic type array class (and any
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226 // multi-dimensional arrays). For example, for [B we check for
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227 // [[B, [[[B, .. and the count is incremented for each one that exists.
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228 static void increment_for_basic_type_arrays(klassOop k) {
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229 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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230 assert(that != NULL, "no JvmtiGetLoadedClassesClosure");
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231 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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232 that->set_count(that->get_count() + 1);
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233 }
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234 }
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235
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236 // add the basic type array class and its multi-dimensional array classes to the list
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237 static void add_for_basic_type_arrays(klassOop k) {
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238 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
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239 assert(that != NULL, "no JvmtiGetLoadedClassesClosure");
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240 assert(that->available(), "no list");
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241 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
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242 oop mirror = Klass::cast(l)->java_mirror();
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243 that->set_element(that->get_index(), mirror);
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244 that->set_index(that->get_index() + 1);
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245 }
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246 }
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247 };
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248
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249
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250 jvmtiError
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251 JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) {
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252 // Since SystemDictionary::classes_do only takes a function pointer
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253 // and doesn't call back with a closure data pointer,
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254 // we can only pass static methods.
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255
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256 JvmtiGetLoadedClassesClosure closure;
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257 {
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258 // To get a consistent list of classes we need MultiArray_lock to ensure
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259 // array classes aren't created, and SystemDictionary_lock to ensure that
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260 // classes aren't added to the system dictionary,
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261 MutexLocker ma(MultiArray_lock);
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262 MutexLocker sd(SystemDictionary_lock);
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263
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264 // First, count the classes
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265 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment);
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266 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment);
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267 // Next, fill in the classes
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268 closure.allocate();
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269 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add);
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270 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add);
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271 // Drop the SystemDictionary_lock, so the results could be wrong from here,
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272 // but we still have a snapshot.
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273 }
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274 // Post results
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275 jclass* result_list;
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276 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
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277 (unsigned char**)&result_list);
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278 if (err != JVMTI_ERROR_NONE) {
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279 return err;
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280 }
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281 closure.extract(env, result_list);
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282 *classCountPtr = closure.get_count();
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283 *classesPtr = result_list;
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284 return JVMTI_ERROR_NONE;
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285 }
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286
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287 jvmtiError
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288 JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader,
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289 jint* classCountPtr, jclass** classesPtr) {
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290 // Since SystemDictionary::classes_do only takes a function pointer
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291 // and doesn't call back with a closure data pointer,
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292 // we can only pass static methods.
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293 JvmtiGetLoadedClassesClosure closure(initiatingLoader);
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294 {
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295 // To get a consistent list of classes we need MultiArray_lock to ensure
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296 // array classes aren't created, and SystemDictionary_lock to ensure that
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297 // classes aren't added to the system dictionary,
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298 MutexLocker ma(MultiArray_lock);
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299 MutexLocker sd(SystemDictionary_lock);
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300 // First, count the classes in the system dictionary which have this loader recorded
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301 // as an initiating loader. For basic type arrays this information is not recorded
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302 // so GetClassLoaderClasses will return all of the basic type arrays. This is okay
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303 // because the defining loader for basic type arrays is always the boot class loader
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304 // and these classes are "visible" to all loaders.
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305 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader);
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306 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays);
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307 // Next, fill in the classes
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308 closure.allocate();
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309 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader);
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310 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays);
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311 // Drop the SystemDictionary_lock, so the results could be wrong from here,
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312 // but we still have a snapshot.
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313 }
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314 // Post results
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315 jclass* result_list;
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316 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
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317 (unsigned char**)&result_list);
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318 if (err != JVMTI_ERROR_NONE) {
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319 return err;
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320 }
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321 closure.extract(env, result_list);
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322 *classCountPtr = closure.get_count();
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323 *classesPtr = result_list;
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324 return JVMTI_ERROR_NONE;
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325 }
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