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1 /*
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2 * Copyright 2003-2009 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 #ifndef _JAVA_JVMTIENVBASE_H_
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26 #define _JAVA_JVMTIENVBASE_H_
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27
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28 //
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29 // Forward Declarations
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30 //
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31
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32 class JvmtiEnv;
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33 class JvmtiThreadState;
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34 class JvmtiRawMonitor; // for jvmtiEnv.hpp
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35 class JvmtiEventControllerPrivate;
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36 class JvmtiTagMap;
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37
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38
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39
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40 // One JvmtiEnv object is created per jvmti attachment;
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41 // done via JNI GetEnv() call. Multiple attachments are
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42 // allowed in jvmti.
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43
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44 class JvmtiEnvBase : public CHeapObj {
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45
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46 private:
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47
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48 static JvmtiEnvBase* _head_environment; // head of environment list
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49
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50 static bool _globally_initialized;
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51 static jvmtiPhase _phase;
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52 static volatile int _dying_thread_env_iteration_count;
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53
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54 public:
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55
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56 enum {
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57 JDK15_JVMTI_VERSION = JVMTI_VERSION_1_0 + 33, /* version: 1.0.33 */
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58 JDK16_JVMTI_VERSION = JVMTI_VERSION_1_1 + 102 /* version: 1.1.102 */
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59 };
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60
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61 static jvmtiPhase get_phase() { return _phase; }
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62 static void set_phase(jvmtiPhase phase) { _phase = phase; }
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63 static bool is_vm_live() { return _phase == JVMTI_PHASE_LIVE; }
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64
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65 static void entering_dying_thread_env_iteration() { ++_dying_thread_env_iteration_count; }
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66 static void leaving_dying_thread_env_iteration() { --_dying_thread_env_iteration_count; }
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67 static bool is_inside_dying_thread_env_iteration(){ return _dying_thread_env_iteration_count > 0; }
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68
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69 private:
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70
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71 enum {
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72 JVMTI_MAGIC = 0x71EE,
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73 DISPOSED_MAGIC = 0xDEFC,
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74 BAD_MAGIC = 0xDEAD
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75 };
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76
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77 jvmtiEnv _jvmti_external;
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78 jint _magic;
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79 jint _version; // version value passed to JNI GetEnv()
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80 JvmtiEnvBase* _next;
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81 bool _is_retransformable;
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82 const void *_env_local_storage; // per env agent allocated data.
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83 jvmtiEventCallbacks _event_callbacks;
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84 jvmtiExtEventCallbacks _ext_event_callbacks;
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85 JvmtiTagMap* _tag_map;
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86 JvmtiEnvEventEnable _env_event_enable;
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87 jvmtiCapabilities _current_capabilities;
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88 jvmtiCapabilities _prohibited_capabilities;
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89 volatile bool _class_file_load_hook_ever_enabled;
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90 static volatile bool _needs_clean_up;
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91 char** _native_method_prefixes;
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92 int _native_method_prefix_count;
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93
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94 protected:
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95 JvmtiEnvBase(jint version);
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96 ~JvmtiEnvBase();
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97 void dispose();
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98 void env_dispose();
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99
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100 void set_env_local_storage(const void* data) { _env_local_storage = data; }
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101 const void* get_env_local_storage() { return _env_local_storage; }
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102
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103 void record_class_file_load_hook_enabled();
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104 void record_first_time_class_file_load_hook_enabled();
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105
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106 char** get_native_method_prefixes() { return _native_method_prefixes; }
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107 int get_native_method_prefix_count() { return _native_method_prefix_count; }
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108 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes);
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109
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110 private:
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111 friend class JvmtiEventControllerPrivate;
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112 void initialize();
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113 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks);
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114 static void globally_initialize();
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115 static void periodic_clean_up();
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116
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117 friend class JvmtiEnvIterator;
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118 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; }
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119 void set_next_environment(JvmtiEnvBase* env) { _next = env; }
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120 static JvmtiEnv* head_environment() { return (JvmtiEnv*)_head_environment; }
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121
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122 public:
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123
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124 bool is_valid() { return _magic == JVMTI_MAGIC; }
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125
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126 bool use_version_1_0_semantics(); // agent asked for version 1.0
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127 bool use_version_1_1_semantics(); // agent asked for version 1.1
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128
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129 bool is_retransformable() { return _is_retransformable; }
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130
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131 static ByteSize jvmti_external_offset() {
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132 return byte_offset_of(JvmtiEnvBase, _jvmti_external);
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133 };
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134
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135 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) {
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136 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset()));
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137 };
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138
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139 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; }
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140
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141 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; }
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142
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143 static char** get_all_native_method_prefixes(int* count_ptr);
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144
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145 // This test will answer true when all environments have been disposed and some have
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146 // not yet been deallocated. As a result, this test should only be used as an
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147 // optimization for the no environment case.
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148 static bool environments_might_exist() {
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149 return head_environment() != NULL;
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150 }
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151
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152 static void check_for_periodic_clean_up();
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153
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154 JvmtiEnvEventEnable *env_event_enable() {
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155 return &_env_event_enable;
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156 }
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157
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158 jvmtiError allocate(jlong size, unsigned char** mem_ptr) {
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159 if (size < 0) {
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160 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
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161 }
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162 if (size == 0) {
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163 *mem_ptr = NULL;
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164 } else {
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165 *mem_ptr = (unsigned char *)os::malloc((size_t)size);
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166 if (*mem_ptr == NULL) {
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167 return JVMTI_ERROR_OUT_OF_MEMORY;
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168 }
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169 }
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170 return JVMTI_ERROR_NONE;
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171 }
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172
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173 jvmtiError deallocate(unsigned char* mem) {
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174 if (mem != NULL) {
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175 os::free(mem);
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176 }
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177 return JVMTI_ERROR_NONE;
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178 }
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179
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180
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181 // Memory functions
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182 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate
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183
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184 // method to create a local handle
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185 jobject jni_reference(Handle hndl) {
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186 return JNIHandles::make_local(hndl());
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187 }
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188
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189 // method to create a local handle.
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190 // This function allows caller to specify which
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191 // threads local handle table to use.
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192 jobject jni_reference(JavaThread *thread, Handle hndl) {
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193 return JNIHandles::make_local(thread, hndl());
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194 }
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195
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196 // method to destroy a local handle
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197 void destroy_jni_reference(jobject jobj) {
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198 JNIHandles::destroy_local(jobj);
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199 }
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200
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201 // method to destroy a local handle.
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202 // This function allows caller to specify which
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203 // threads local handle table to use although currently it is
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204 // not used.
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205 void destroy_jni_reference(JavaThread *thread, jobject jobj) {
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206 destroy_jni_reference(jobj);
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207 }
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208
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209 jvmtiEnv* jvmti_external() { return &_jvmti_external; };
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210
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211 // Event Dispatch
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212
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213 bool has_callback(jvmtiEvent event_type) {
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214 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL &&
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215 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking");
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216 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL;
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217 }
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218
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219 jvmtiEventCallbacks* callbacks() {
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220 return &_event_callbacks;
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221 }
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222
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223 jvmtiExtEventCallbacks* ext_callbacks() {
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224 return &_ext_event_callbacks;
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225 }
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226
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227 void set_tag_map(JvmtiTagMap* tag_map) {
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228 _tag_map = tag_map;
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229 }
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230
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231 JvmtiTagMap* tag_map() {
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232 return _tag_map;
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233 }
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234
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235
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236 // return true if event is enabled globally or for any thread
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237 // True only if there is a callback for it.
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238 bool is_enabled(jvmtiEvent event_type) {
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239 return _env_event_enable.is_enabled(event_type);
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240 }
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241
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242 // Random Utilities
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243
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244 protected:
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245 // helper methods for creating arrays of global JNI Handles from local Handles
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246 // allocated into environment specific storage
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247 jobject * new_jobjectArray(int length, Handle *handles);
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248 jthread * new_jthreadArray(int length, Handle *handles);
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249 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles);
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250
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251 // convert from JNIHandle to JavaThread *
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252 JavaThread * get_JavaThread(jthread jni_thread);
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253
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254 // convert to a jni jclass from a non-null klassOop
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255 jclass get_jni_class_non_null(klassOop k);
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256
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257 void update_klass_field_access_flag(fieldDescriptor *fd);
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258
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259 jint count_locked_objects(JavaThread *java_thread, Handle hobj);
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260 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread,
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261 JavaThread* java_thread,
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262 javaVFrame *jvf,
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263 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list,
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264 jint depth);
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265 vframe* vframeFor(JavaThread* java_thread, jint depth);
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266
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267 public:
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268 // get a field descriptor for the specified class and field
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269 static bool get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd);
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270 // test for suspend - most (all?) of these should go away
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271 static bool is_thread_fully_suspended(JavaThread *thread,
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272 bool wait_for_suspend,
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273 uint32_t *bits);
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274
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275
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276 // JVMTI API helper functions which are called at safepoint or thread is suspended.
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277 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr);
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278 jvmtiError get_frame_location(JavaThread* java_thread, jint depth,
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279 jmethodID* method_ptr, jlocation* location_ptr);
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280 jvmtiError get_object_monitor_usage(JavaThread *calling_thread,
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281 jobject object, jvmtiMonitorUsage* info_ptr);
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282 jvmtiError get_stack_trace(JavaThread *java_thread,
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283 jint stack_depth, jint max_count,
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284 jvmtiFrameInfo* frame_buffer, jint* count_ptr);
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285 jvmtiError get_current_contended_monitor(JavaThread *calling_thread,
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286 JavaThread *java_thread,
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287 jobject *monitor_ptr);
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288 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
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289 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list);
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290 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
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291 jvalue value, TosState tos, Handle* ret_ob_h);
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292 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos);
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293 };
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294
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295 // This class is the only safe means of iterating through environments.
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296 // Note that this iteratation includes invalid environments pending
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297 // deallocation -- in fact, some uses depend on this behavior.
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298
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299 class JvmtiEnvIterator : public StackObj {
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300 private:
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301 bool _entry_was_marked;
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302 public:
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303 JvmtiEnvIterator() {
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304 if (Threads::number_of_threads() == 0) {
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305 _entry_was_marked = false; // we are single-threaded, no need
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306 } else {
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307 Thread::current()->entering_jvmti_env_iteration();
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308 _entry_was_marked = true;
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309 }
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310 }
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311 ~JvmtiEnvIterator() {
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312 if (_entry_was_marked) {
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313 Thread::current()->leaving_jvmti_env_iteration();
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314 }
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315 }
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316 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); }
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317 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); }
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318 };
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319
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320
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321 // VM operation to get monitor information with stack depth.
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322 class VM_GetOwnedMonitorInfo : public VM_Operation {
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323 private:
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324 JvmtiEnv *_env;
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325 JavaThread* _calling_thread;
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326 JavaThread *_java_thread;
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327 jvmtiError _result;
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328 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
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329
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330 public:
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331 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread,
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332 JavaThread* java_thread,
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333 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) {
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334 _env = env;
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335 _calling_thread = calling_thread;
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336 _java_thread = java_thread;
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337 _owned_monitors_list = owned_monitor_list;
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338 _result = JVMTI_ERROR_NONE;
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339 }
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340 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; }
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341 void doit() {
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342 ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread,
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343 _owned_monitors_list);
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344 }
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345 jvmtiError result() { return _result; }
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346 };
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347
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348
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349 // VM operation to get object monitor usage.
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350 class VM_GetObjectMonitorUsage : public VM_Operation {
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351 private:
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352 JvmtiEnv *_env;
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353 jobject _object;
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354 JavaThread* _calling_thread;
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355 jvmtiMonitorUsage* _info_ptr;
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356 jvmtiError _result;
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357
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358 public:
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359 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
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360 _env = env;
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361 _object = object;
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362 _calling_thread = calling_thread;
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363 _info_ptr = info_ptr;
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364 }
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365 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; }
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366 jvmtiError result() { return _result; }
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367 void doit() {
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368 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr);
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369 }
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370
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371 };
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372
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373 // VM operation to get current contended monitor.
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374 class VM_GetCurrentContendedMonitor : public VM_Operation {
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375 private:
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376 JvmtiEnv *_env;
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377 JavaThread *_calling_thread;
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378 JavaThread *_java_thread;
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379 jobject *_owned_monitor_ptr;
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380 jvmtiError _result;
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381
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382 public:
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383 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) {
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384 _env = env;
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385 _calling_thread = calling_thread;
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386 _java_thread = java_thread;
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387 _owned_monitor_ptr = mon_ptr;
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388 }
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389 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; }
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390 jvmtiError result() { return _result; }
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391 void doit() {
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392 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr);
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393 }
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394 };
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395
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396 // VM operation to get stack trace at safepoint.
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397 class VM_GetStackTrace : public VM_Operation {
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398 private:
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399 JvmtiEnv *_env;
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400 JavaThread *_java_thread;
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401 jint _start_depth;
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402 jint _max_count;
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403 jvmtiFrameInfo *_frame_buffer;
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404 jint *_count_ptr;
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405 jvmtiError _result;
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406
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407 public:
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408 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread,
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409 jint start_depth, jint max_count,
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410 jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
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411 _env = env;
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412 _java_thread = java_thread;
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413 _start_depth = start_depth;
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414 _max_count = max_count;
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415 _frame_buffer = frame_buffer;
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416 _count_ptr = count_ptr;
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417 }
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418 jvmtiError result() { return _result; }
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419 VMOp_Type type() const { return VMOp_GetStackTrace; }
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420 void doit() {
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421 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread,
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422 _start_depth, _max_count,
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423 _frame_buffer, _count_ptr);
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424 }
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425 };
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426
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427 // forward declaration
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428 struct StackInfoNode;
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429
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430 // VM operation to get stack trace at safepoint.
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431 class VM_GetMultipleStackTraces : public VM_Operation {
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432 private:
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433 JvmtiEnv *_env;
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434 jint _max_frame_count;
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435 jvmtiStackInfo *_stack_info;
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436 jvmtiError _result;
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437 int _frame_count_total;
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438 struct StackInfoNode *_head;
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439
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440 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; }
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441 jint max_frame_count() { return _max_frame_count; }
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442 struct StackInfoNode *head() { return _head; }
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443 void set_head(StackInfoNode *head) { _head = head; }
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444
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445 protected:
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446 void set_result(jvmtiError result) { _result = result; }
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447 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop);
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448 void allocate_and_fill_stacks(jint thread_count);
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449
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450 public:
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451 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) {
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452 _env = env;
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453 _max_frame_count = max_frame_count;
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454 _frame_count_total = 0;
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455 _head = NULL;
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456 _result = JVMTI_ERROR_NONE;
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457 }
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458 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; }
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459 jvmtiStackInfo *stack_info() { return _stack_info; }
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460 jvmtiError result() { return _result; }
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461 };
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462
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463
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464 // VM operation to get stack trace at safepoint.
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465 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces {
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466 private:
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467 JavaThread *_calling_thread;
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468 jint _final_thread_count;
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469
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470 public:
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471 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread,
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472 jint max_frame_count)
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473 : VM_GetMultipleStackTraces(env, max_frame_count) {
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474 _calling_thread = calling_thread;
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475 }
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476 VMOp_Type type() const { return VMOp_GetAllStackTraces; }
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477 void doit();
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478 jint final_thread_count() { return _final_thread_count; }
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479 };
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480
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481 // VM operation to get stack trace at safepoint.
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482 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces {
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483 private:
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484 jint _thread_count;
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485 const jthread* _thread_list;
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486
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487 public:
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488 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count)
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489 : VM_GetMultipleStackTraces(env, max_frame_count) {
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490 _thread_count = thread_count;
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491 _thread_list = thread_list;
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492 }
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493 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; }
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494 void doit();
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495 };
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496
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497
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498 // VM operation to count stack frames at safepoint.
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499 class VM_GetFrameCount : public VM_Operation {
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500 private:
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501 JvmtiEnv *_env;
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502 JvmtiThreadState *_state;
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503 jint *_count_ptr;
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504 jvmtiError _result;
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505
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506 public:
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507 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) {
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508 _env = env;
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509 _state = state;
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510 _count_ptr = count_ptr;
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511 }
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512 VMOp_Type type() const { return VMOp_GetFrameCount; }
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513 jvmtiError result() { return _result; }
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514 void doit() {
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515 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr);
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516 }
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517 };
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518
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519 // VM operation to frame location at safepoint.
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520 class VM_GetFrameLocation : public VM_Operation {
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521 private:
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522 JvmtiEnv *_env;
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523 JavaThread* _java_thread;
|
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524 jint _depth;
|
|
525 jmethodID* _method_ptr;
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526 jlocation* _location_ptr;
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527 jvmtiError _result;
|
|
528
|
|
529 public:
|
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530 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth,
|
|
531 jmethodID* method_ptr, jlocation* location_ptr) {
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532 _env = env;
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533 _java_thread = java_thread;
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534 _depth = depth;
|
|
535 _method_ptr = method_ptr;
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536 _location_ptr = location_ptr;
|
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537 }
|
|
538 VMOp_Type type() const { return VMOp_GetFrameLocation; }
|
|
539 jvmtiError result() { return _result; }
|
|
540 void doit() {
|
|
541 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth,
|
|
542 _method_ptr, _location_ptr);
|
|
543 }
|
|
544 };
|
|
545
|
|
546
|
|
547 // ResourceTracker
|
|
548 //
|
|
549 // ResourceTracker works a little like a ResourceMark. All allocates
|
|
550 // using the resource tracker are recorded. If an allocate using the
|
|
551 // resource tracker fails the destructor will free any resources
|
|
552 // that were allocated using the tracker.
|
|
553 // The motive for this class is to avoid messy error recovery code
|
|
554 // in situations where multiple allocations are done in sequence. If
|
|
555 // the second or subsequent allocation fails it avoids any code to
|
|
556 // release memory allocated in the previous calls.
|
|
557 //
|
|
558 // Usage :-
|
|
559 // ResourceTracker rt(env);
|
|
560 // :
|
|
561 // err = rt.allocate(1024, &ptr);
|
|
562
|
|
563 class ResourceTracker : public StackObj {
|
|
564 private:
|
|
565 JvmtiEnv* _env;
|
|
566 GrowableArray<unsigned char*> *_allocations;
|
|
567 bool _failed;
|
|
568 public:
|
|
569 ResourceTracker(JvmtiEnv* env);
|
|
570 ~ResourceTracker();
|
|
571 jvmtiError allocate(jlong size, unsigned char** mem_ptr);
|
|
572 unsigned char* allocate(jlong size);
|
|
573 char* strdup(const char* str);
|
|
574 };
|
|
575
|
|
576
|
|
577 // Jvmti monitor closure to collect off stack monitors.
|
|
578 class JvmtiMonitorClosure: public MonitorClosure {
|
|
579 private:
|
|
580 JavaThread *_java_thread;
|
|
581 JavaThread *_calling_thread;
|
|
582 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
|
|
583 jvmtiError _error;
|
|
584 JvmtiEnvBase *_env;
|
|
585
|
|
586 public:
|
|
587 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread,
|
|
588 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors,
|
|
589 JvmtiEnvBase *env) {
|
|
590 _java_thread = thread;
|
|
591 _calling_thread = calling_thread;
|
|
592 _owned_monitors_list = owned_monitors;
|
|
593 _error = JVMTI_ERROR_NONE;
|
|
594 _env = env;
|
|
595 }
|
|
596 void do_monitor(ObjectMonitor* mon);
|
|
597 jvmtiError error() { return _error;}
|
|
598 };
|
|
599
|
|
600 #endif /* _JAVA_JVMTIENVBASE_H_ */
|