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0
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1 /*
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2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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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 JvmtiEnvBase* _next;
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80 bool _is_retransformable;
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81 const void *_env_local_storage; // per env agent allocated data.
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82 jvmtiEventCallbacks _event_callbacks;
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83 jvmtiExtEventCallbacks _ext_event_callbacks;
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84 JvmtiTagMap* _tag_map;
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85 JvmtiEnvEventEnable _env_event_enable;
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86 jvmtiCapabilities _current_capabilities;
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87 jvmtiCapabilities _prohibited_capabilities;
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88 volatile bool _class_file_load_hook_ever_enabled;
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89 static volatile bool _needs_clean_up;
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90 char** _native_method_prefixes;
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91 int _native_method_prefix_count;
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92
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93 protected:
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94 JvmtiEnvBase();
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95 ~JvmtiEnvBase();
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96 void dispose();
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97 void env_dispose();
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98
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99 void set_env_local_storage(const void* data) { _env_local_storage = data; }
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100 const void* get_env_local_storage() { return _env_local_storage; }
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101
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102 void record_class_file_load_hook_enabled();
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103 void record_first_time_class_file_load_hook_enabled();
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104
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105 char** get_native_method_prefixes() { return _native_method_prefixes; }
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106 int get_native_method_prefix_count() { return _native_method_prefix_count; }
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107 jvmtiError set_native_method_prefixes(jint prefix_count, char** prefixes);
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108
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109 private:
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110 friend class JvmtiEventControllerPrivate;
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111 void initialize();
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112 void set_event_callbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks);
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113 static void globally_initialize();
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114 static void periodic_clean_up();
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115
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116 friend class JvmtiEnvIterator;
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117 JvmtiEnv* next_environment() { return (JvmtiEnv*)_next; }
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118 void set_next_environment(JvmtiEnvBase* env) { _next = env; }
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119 static JvmtiEnv* head_environment() { return (JvmtiEnv*)_head_environment; }
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120
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121 public:
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122
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123 bool is_valid() { return _magic == JVMTI_MAGIC; }
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124
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125 bool is_retransformable() { return _is_retransformable; }
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126
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127 static ByteSize jvmti_external_offset() {
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128 return byte_offset_of(JvmtiEnvBase, _jvmti_external);
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129 };
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130
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131 static JvmtiEnv* JvmtiEnv_from_jvmti_env(jvmtiEnv *env) {
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132 return (JvmtiEnv*)((intptr_t)env - in_bytes(jvmti_external_offset()));
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133 };
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134
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135 jvmtiCapabilities *get_capabilities() { return &_current_capabilities; }
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136
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137 jvmtiCapabilities *get_prohibited_capabilities() { return &_prohibited_capabilities; }
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138
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139 static char** get_all_native_method_prefixes(int* count_ptr);
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140
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141 // This test will answer true when all environments have been disposed and some have
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142 // not yet been deallocated. As a result, this test should only be used as an
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143 // optimization for the no environment case.
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144 static bool environments_might_exist() {
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145 return head_environment() != NULL;
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146 }
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147
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148 static void check_for_periodic_clean_up();
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149
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150 JvmtiEnvEventEnable *env_event_enable() {
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151 return &_env_event_enable;
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152 }
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153
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154 jvmtiError allocate(jlong size, unsigned char** mem_ptr) {
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155 if (size < 0) {
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156 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
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157 }
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158 if (size == 0) {
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159 *mem_ptr = NULL;
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160 } else {
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161 *mem_ptr = (unsigned char *)os::malloc((size_t)size);
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162 if (*mem_ptr == NULL) {
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163 return JVMTI_ERROR_OUT_OF_MEMORY;
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164 }
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165 }
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166 return JVMTI_ERROR_NONE;
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167 }
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168
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169 jvmtiError deallocate(unsigned char* mem) {
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170 if (mem != NULL) {
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171 os::free(mem);
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172 }
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173 return JVMTI_ERROR_NONE;
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174 }
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175
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176
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177 // Memory functions
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178 unsigned char* jvmtiMalloc(jlong size); // don't use this - call allocate
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179
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180 // method to create a local handle
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181 jobject jni_reference(Handle hndl) {
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182 return JNIHandles::make_local(hndl());
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183 }
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184
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185 // method to create a local handle.
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186 // This function allows caller to specify which
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187 // threads local handle table to use.
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188 jobject jni_reference(JavaThread *thread, Handle hndl) {
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189 return JNIHandles::make_local(thread, hndl());
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190 }
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191
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192 // method to destroy a local handle
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193 void destroy_jni_reference(jobject jobj) {
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194 JNIHandles::destroy_local(jobj);
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195 }
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196
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197 // method to destroy a local handle.
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198 // This function allows caller to specify which
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199 // threads local handle table to use although currently it is
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200 // not used.
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201 void destroy_jni_reference(JavaThread *thread, jobject jobj) {
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202 destroy_jni_reference(jobj);
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203 }
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204
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205 jvmtiEnv* jvmti_external() { return &_jvmti_external; };
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206
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207 // Event Dispatch
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208
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209 bool has_callback(jvmtiEvent event_type) {
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210 assert(event_type >= JVMTI_MIN_EVENT_TYPE_VAL &&
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211 event_type <= JVMTI_MAX_EVENT_TYPE_VAL, "checking");
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212 return ((void**)&_event_callbacks)[event_type-JVMTI_MIN_EVENT_TYPE_VAL] != NULL;
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213 }
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214
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215 jvmtiEventCallbacks* callbacks() {
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216 return &_event_callbacks;
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217 }
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218
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219 jvmtiExtEventCallbacks* ext_callbacks() {
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220 return &_ext_event_callbacks;
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221 }
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222
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223 void set_tag_map(JvmtiTagMap* tag_map) {
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224 _tag_map = tag_map;
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225 }
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226
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227 JvmtiTagMap* tag_map() {
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228 return _tag_map;
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229 }
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230
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231
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232 // return true if event is enabled globally or for any thread
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233 // True only if there is a callback for it.
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234 bool is_enabled(jvmtiEvent event_type) {
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235 return _env_event_enable.is_enabled(event_type);
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236 }
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237
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238 // Random Utilities
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239
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240 protected:
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241 // helper methods for creating arrays of global JNI Handles from local Handles
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242 // allocated into environment specific storage
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243 jobject * new_jobjectArray(int length, Handle *handles);
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244 jthread * new_jthreadArray(int length, Handle *handles);
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245 jthreadGroup * new_jthreadGroupArray(int length, Handle *handles);
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246
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247 // convert from JNIHandle to JavaThread *
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248 JavaThread * get_JavaThread(jthread jni_thread);
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249
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250 // convert to a jni jclass from a non-null klassOop
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251 jclass get_jni_class_non_null(klassOop k);
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252
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253 void update_klass_field_access_flag(fieldDescriptor *fd);
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254
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255 jint count_locked_objects(JavaThread *java_thread, Handle hobj);
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256 jvmtiError get_locked_objects_in_frame(JavaThread *calling_thread,
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257 JavaThread* java_thread,
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258 javaVFrame *jvf,
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259 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitors_list,
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260 jint depth);
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261 vframe* vframeFor(JavaThread* java_thread, jint depth);
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262
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263 public:
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264 // get a field descriptor for the specified class and field
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265 static bool get_field_descriptor(klassOop k, jfieldID field, fieldDescriptor* fd);
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266 // test for suspend - most (all?) of these should go away
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267 static bool is_thread_fully_suspended(JavaThread *thread,
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268 bool wait_for_suspend,
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269 uint32_t *bits);
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270
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271
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272 // JVMTI API helper functions which are called at safepoint or thread is suspended.
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273 jvmtiError get_frame_count(JvmtiThreadState *state, jint *count_ptr);
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274 jvmtiError get_frame_location(JavaThread* java_thread, jint depth,
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275 jmethodID* method_ptr, jlocation* location_ptr);
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276 jvmtiError get_object_monitor_usage(JavaThread *calling_thread,
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277 jobject object, jvmtiMonitorUsage* info_ptr);
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278 jvmtiError get_stack_trace(JavaThread *java_thread,
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279 jint stack_depth, jint max_count,
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280 jvmtiFrameInfo* frame_buffer, jint* count_ptr);
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281 jvmtiError get_current_contended_monitor(JavaThread *calling_thread,
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282 JavaThread *java_thread,
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283 jobject *monitor_ptr);
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284 jvmtiError get_owned_monitors(JavaThread *calling_thread, JavaThread* java_thread,
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285 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list);
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286 jvmtiError check_top_frame(JavaThread* current_thread, JavaThread* java_thread,
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287 jvalue value, TosState tos, Handle* ret_ob_h);
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288 jvmtiError force_early_return(JavaThread* java_thread, jvalue value, TosState tos);
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289 };
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290
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291 // This class is the only safe means of iterating through environments.
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292 // Note that this iteratation includes invalid environments pending
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293 // deallocation -- in fact, some uses depend on this behavior.
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294
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295 class JvmtiEnvIterator : public StackObj {
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296 private:
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297 bool _entry_was_marked;
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298 public:
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299 JvmtiEnvIterator() {
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300 if (Threads::number_of_threads() == 0) {
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301 _entry_was_marked = false; // we are single-threaded, no need
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302 } else {
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303 Thread::current()->entering_jvmti_env_iteration();
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304 _entry_was_marked = true;
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305 }
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306 }
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307 ~JvmtiEnvIterator() {
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308 if (_entry_was_marked) {
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309 Thread::current()->leaving_jvmti_env_iteration();
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310 }
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311 }
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312 JvmtiEnv* first() { return JvmtiEnvBase::head_environment(); }
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313 JvmtiEnv* next(JvmtiEnvBase* env) { return env->next_environment(); }
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314 };
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315
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316
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317 // VM operation to get monitor information with stack depth.
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318 class VM_GetOwnedMonitorInfo : public VM_Operation {
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319 private:
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320 JvmtiEnv *_env;
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321 JavaThread* _calling_thread;
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322 JavaThread *_java_thread;
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323 jvmtiError _result;
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324 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
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325
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326 public:
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327 VM_GetOwnedMonitorInfo(JvmtiEnv* env, JavaThread* calling_thread,
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328 JavaThread* java_thread,
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329 GrowableArray<jvmtiMonitorStackDepthInfo*>* owned_monitor_list) {
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330 _env = env;
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331 _calling_thread = calling_thread;
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332 _java_thread = java_thread;
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333 _owned_monitors_list = owned_monitor_list;
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334 _result = JVMTI_ERROR_NONE;
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335 }
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336 VMOp_Type type() const { return VMOp_GetOwnedMonitorInfo; }
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337 void doit() {
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338 ((JvmtiEnvBase *)_env)->get_owned_monitors(_calling_thread, _java_thread,
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339 _owned_monitors_list);
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340 }
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341 jvmtiError result() { return _result; }
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342 };
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343
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344
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345 // VM operation to get object monitor usage.
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346 class VM_GetObjectMonitorUsage : public VM_Operation {
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347 private:
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348 JvmtiEnv *_env;
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349 jobject _object;
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350 JavaThread* _calling_thread;
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351 jvmtiMonitorUsage* _info_ptr;
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352 jvmtiError _result;
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353
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354 public:
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355 VM_GetObjectMonitorUsage(JvmtiEnv *env, JavaThread* calling_thread, jobject object, jvmtiMonitorUsage* info_ptr) {
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356 _env = env;
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357 _object = object;
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358 _calling_thread = calling_thread;
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359 _info_ptr = info_ptr;
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360 }
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361 VMOp_Type type() const { return VMOp_GetObjectMonitorUsage; }
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362 jvmtiError result() { return _result; }
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363 void doit() {
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364 _result = ((JvmtiEnvBase*) _env)->get_object_monitor_usage(_calling_thread, _object, _info_ptr);
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365 }
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366
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367 };
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368
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369 // VM operation to get current contended monitor.
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370 class VM_GetCurrentContendedMonitor : public VM_Operation {
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371 private:
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372 JvmtiEnv *_env;
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373 JavaThread *_calling_thread;
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374 JavaThread *_java_thread;
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375 jobject *_owned_monitor_ptr;
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376 jvmtiError _result;
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377
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378 public:
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379 VM_GetCurrentContendedMonitor(JvmtiEnv *env, JavaThread *calling_thread, JavaThread *java_thread, jobject *mon_ptr) {
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380 _env = env;
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381 _calling_thread = calling_thread;
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382 _java_thread = java_thread;
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383 _owned_monitor_ptr = mon_ptr;
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384 }
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385 VMOp_Type type() const { return VMOp_GetCurrentContendedMonitor; }
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386 jvmtiError result() { return _result; }
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387 void doit() {
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388 _result = ((JvmtiEnvBase *)_env)->get_current_contended_monitor(_calling_thread,_java_thread,_owned_monitor_ptr);
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389 }
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390 };
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391
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392 // VM operation to get stack trace at safepoint.
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393 class VM_GetStackTrace : public VM_Operation {
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394 private:
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395 JvmtiEnv *_env;
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396 JavaThread *_java_thread;
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397 jint _start_depth;
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398 jint _max_count;
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399 jvmtiFrameInfo *_frame_buffer;
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400 jint *_count_ptr;
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401 jvmtiError _result;
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402
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403 public:
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404 VM_GetStackTrace(JvmtiEnv *env, JavaThread *java_thread,
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405 jint start_depth, jint max_count,
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406 jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
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407 _env = env;
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408 _java_thread = java_thread;
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409 _start_depth = start_depth;
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410 _max_count = max_count;
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411 _frame_buffer = frame_buffer;
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412 _count_ptr = count_ptr;
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413 }
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414 jvmtiError result() { return _result; }
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415 VMOp_Type type() const { return VMOp_GetStackTrace; }
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416 void doit() {
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417 _result = ((JvmtiEnvBase *)_env)->get_stack_trace(_java_thread,
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418 _start_depth, _max_count,
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419 _frame_buffer, _count_ptr);
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420 }
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421 };
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422
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423 // forward declaration
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424 struct StackInfoNode;
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425
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426 // VM operation to get stack trace at safepoint.
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427 class VM_GetMultipleStackTraces : public VM_Operation {
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428 private:
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429 JvmtiEnv *_env;
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430 jint _max_frame_count;
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431 jvmtiStackInfo *_stack_info;
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432 jvmtiError _result;
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433 int _frame_count_total;
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434 struct StackInfoNode *_head;
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435
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436 JvmtiEnvBase *env() { return (JvmtiEnvBase *)_env; }
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437 jint max_frame_count() { return _max_frame_count; }
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438 struct StackInfoNode *head() { return _head; }
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439 void set_head(StackInfoNode *head) { _head = head; }
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440
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441 protected:
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442 void set_result(jvmtiError result) { _result = result; }
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443 void fill_frames(jthread jt, JavaThread *thr, oop thread_oop);
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444 void allocate_and_fill_stacks(jint thread_count);
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445
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446 public:
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447 VM_GetMultipleStackTraces(JvmtiEnv *env, jint max_frame_count) {
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448 _env = env;
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449 _max_frame_count = max_frame_count;
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450 _frame_count_total = 0;
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451 _head = NULL;
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452 _result = JVMTI_ERROR_NONE;
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453 }
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454 VMOp_Type type() const { return VMOp_GetMultipleStackTraces; }
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455 jvmtiStackInfo *stack_info() { return _stack_info; }
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456 jvmtiError result() { return _result; }
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457 };
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458
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459
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460 // VM operation to get stack trace at safepoint.
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461 class VM_GetAllStackTraces : public VM_GetMultipleStackTraces {
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462 private:
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463 JavaThread *_calling_thread;
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464 jint _final_thread_count;
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465
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466 public:
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467 VM_GetAllStackTraces(JvmtiEnv *env, JavaThread *calling_thread,
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468 jint max_frame_count)
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469 : VM_GetMultipleStackTraces(env, max_frame_count) {
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470 _calling_thread = calling_thread;
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471 }
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472 VMOp_Type type() const { return VMOp_GetAllStackTraces; }
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473 void doit();
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474 jint final_thread_count() { return _final_thread_count; }
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475 };
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476
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477 // VM operation to get stack trace at safepoint.
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478 class VM_GetThreadListStackTraces : public VM_GetMultipleStackTraces {
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479 private:
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480 jint _thread_count;
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481 const jthread* _thread_list;
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482
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483 public:
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484 VM_GetThreadListStackTraces(JvmtiEnv *env, jint thread_count, const jthread* thread_list, jint max_frame_count)
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485 : VM_GetMultipleStackTraces(env, max_frame_count) {
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486 _thread_count = thread_count;
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487 _thread_list = thread_list;
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488 }
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489 VMOp_Type type() const { return VMOp_GetThreadListStackTraces; }
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490 void doit();
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491 };
|
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492
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493
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494 // VM operation to count stack frames at safepoint.
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|
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495 class VM_GetFrameCount : public VM_Operation {
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496 private:
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497 JvmtiEnv *_env;
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498 JvmtiThreadState *_state;
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499 jint *_count_ptr;
|
|
|
500 jvmtiError _result;
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501
|
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502 public:
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503 VM_GetFrameCount(JvmtiEnv *env, JvmtiThreadState *state, jint *count_ptr) {
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504 _env = env;
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|
505 _state = state;
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|
506 _count_ptr = count_ptr;
|
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507 }
|
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|
508 VMOp_Type type() const { return VMOp_GetFrameCount; }
|
|
|
509 jvmtiError result() { return _result; }
|
|
|
510 void doit() {
|
|
|
511 _result = ((JvmtiEnvBase*)_env)->get_frame_count(_state, _count_ptr);
|
|
|
512 }
|
|
|
513 };
|
|
|
514
|
|
|
515 // VM operation to frame location at safepoint.
|
|
|
516 class VM_GetFrameLocation : public VM_Operation {
|
|
|
517 private:
|
|
|
518 JvmtiEnv *_env;
|
|
|
519 JavaThread* _java_thread;
|
|
|
520 jint _depth;
|
|
|
521 jmethodID* _method_ptr;
|
|
|
522 jlocation* _location_ptr;
|
|
|
523 jvmtiError _result;
|
|
|
524
|
|
|
525 public:
|
|
|
526 VM_GetFrameLocation(JvmtiEnv *env, JavaThread* java_thread, jint depth,
|
|
|
527 jmethodID* method_ptr, jlocation* location_ptr) {
|
|
|
528 _env = env;
|
|
|
529 _java_thread = java_thread;
|
|
|
530 _depth = depth;
|
|
|
531 _method_ptr = method_ptr;
|
|
|
532 _location_ptr = location_ptr;
|
|
|
533 }
|
|
|
534 VMOp_Type type() const { return VMOp_GetFrameLocation; }
|
|
|
535 jvmtiError result() { return _result; }
|
|
|
536 void doit() {
|
|
|
537 _result = ((JvmtiEnvBase*)_env)->get_frame_location(_java_thread, _depth,
|
|
|
538 _method_ptr, _location_ptr);
|
|
|
539 }
|
|
|
540 };
|
|
|
541
|
|
|
542
|
|
|
543 // ResourceTracker
|
|
|
544 //
|
|
|
545 // ResourceTracker works a little like a ResourceMark. All allocates
|
|
|
546 // using the resource tracker are recorded. If an allocate using the
|
|
|
547 // resource tracker fails the destructor will free any resources
|
|
|
548 // that were allocated using the tracker.
|
|
|
549 // The motive for this class is to avoid messy error recovery code
|
|
|
550 // in situations where multiple allocations are done in sequence. If
|
|
|
551 // the second or subsequent allocation fails it avoids any code to
|
|
|
552 // release memory allocated in the previous calls.
|
|
|
553 //
|
|
|
554 // Usage :-
|
|
|
555 // ResourceTracker rt(env);
|
|
|
556 // :
|
|
|
557 // err = rt.allocate(1024, &ptr);
|
|
|
558
|
|
|
559 class ResourceTracker : public StackObj {
|
|
|
560 private:
|
|
|
561 JvmtiEnv* _env;
|
|
|
562 GrowableArray<unsigned char*> *_allocations;
|
|
|
563 bool _failed;
|
|
|
564 public:
|
|
|
565 ResourceTracker(JvmtiEnv* env);
|
|
|
566 ~ResourceTracker();
|
|
|
567 jvmtiError allocate(jlong size, unsigned char** mem_ptr);
|
|
|
568 unsigned char* allocate(jlong size);
|
|
|
569 char* strdup(const char* str);
|
|
|
570 };
|
|
|
571
|
|
|
572
|
|
|
573 // Jvmti monitor closure to collect off stack monitors.
|
|
|
574 class JvmtiMonitorClosure: public MonitorClosure {
|
|
|
575 private:
|
|
|
576 JavaThread *_java_thread;
|
|
|
577 JavaThread *_calling_thread;
|
|
|
578 GrowableArray<jvmtiMonitorStackDepthInfo*> *_owned_monitors_list;
|
|
|
579 jvmtiError _error;
|
|
|
580 JvmtiEnvBase *_env;
|
|
|
581
|
|
|
582 public:
|
|
|
583 JvmtiMonitorClosure(JavaThread* thread, JavaThread *calling_thread,
|
|
|
584 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors,
|
|
|
585 JvmtiEnvBase *env) {
|
|
|
586 _java_thread = thread;
|
|
|
587 _calling_thread = calling_thread;
|
|
|
588 _owned_monitors_list = owned_monitors;
|
|
|
589 _error = JVMTI_ERROR_NONE;
|
|
|
590 _env = env;
|
|
|
591 }
|
|
|
592 void do_monitor(ObjectMonitor* mon);
|
|
|
593 jvmtiError error() { return _error;}
|
|
|
594 };
|
|
|
595
|
|
|
596 #endif /* _JAVA_JVMTIENVBASE_H_ */
|
