annotate src/share/vm/prims/jvmtiExport.hpp @ 6197:d2a62e0f25eb

6995781: Native Memory Tracking (Phase 1) 7151532: DCmd for hotspot native memory tracking Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd Reviewed-by: acorn, coleenp, fparain
author zgu
date Thu, 28 Jun 2012 17:03:16 -0400
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1 /*
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_PRIMS_JVMTIEXPORT_HPP
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26 #define SHARE_VM_PRIMS_JVMTIEXPORT_HPP
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27
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28 #include "jvmtifiles/jvmti.h"
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29 #include "memory/allocation.hpp"
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30 #include "memory/iterator.hpp"
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31 #include "oops/oop.hpp"
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32 #include "oops/oopsHierarchy.hpp"
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33 #include "runtime/frame.hpp"
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34 #include "runtime/handles.hpp"
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35 #include "utilities/globalDefinitions.hpp"
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36 #include "utilities/growableArray.hpp"
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37
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38 // Must be included after jvmti.h.
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39 #include "code/jvmticmlr.h"
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40
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41 // Forward declarations
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42
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43 class JvmtiEventControllerPrivate;
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44 class JvmtiManageCapabilities;
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45 class JvmtiEnv;
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46 class JvmtiThreadState;
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47 class AttachOperation;
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48
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49 #ifndef JVMTI_KERNEL
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50 #define JVMTI_SUPPORT_FLAG(key) \
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51 private: \
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52 static bool _##key; \
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53 public: \
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54 inline static void set_##key(bool on) { _##key = (on != 0); } \
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55 inline static bool key() { return _##key; }
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56 #else // JVMTI_KERNEL
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57 #define JVMTI_SUPPORT_FLAG(key) \
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58 private: \
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59 const static bool _##key = false; \
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60 public: \
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61 inline static void set_##key(bool on) { report_unsupported(on); } \
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62 inline static bool key() { return _##key; }
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63 #endif // JVMTI_KERNEL
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64
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65
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66 // This class contains the JVMTI interface for the rest of hotspot.
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67 //
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68 class JvmtiExport : public AllStatic {
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69 friend class VMStructs;
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70 private:
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71 static int _field_access_count;
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72 static int _field_modification_count;
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73
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74 static bool _can_access_local_variables;
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75 static bool _can_hotswap_or_post_breakpoint;
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76 static bool _can_modify_any_class;
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77 static bool _can_walk_any_space;
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78
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79 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension)
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80 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order)
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81 JVMTI_SUPPORT_FLAG(can_post_interpreter_events)
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82 JVMTI_SUPPORT_FLAG(can_post_on_exceptions)
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83 JVMTI_SUPPORT_FLAG(can_post_breakpoint)
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84 JVMTI_SUPPORT_FLAG(can_post_field_access)
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85 JVMTI_SUPPORT_FLAG(can_post_field_modification)
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86 JVMTI_SUPPORT_FLAG(can_post_method_entry)
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87 JVMTI_SUPPORT_FLAG(can_post_method_exit)
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88 JVMTI_SUPPORT_FLAG(can_pop_frame)
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89 JVMTI_SUPPORT_FLAG(can_force_early_return)
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90
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91 friend class JvmtiEventControllerPrivate; // should only modify these flags
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92 JVMTI_SUPPORT_FLAG(should_post_single_step)
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93 JVMTI_SUPPORT_FLAG(should_post_field_access)
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94 JVMTI_SUPPORT_FLAG(should_post_field_modification)
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95 JVMTI_SUPPORT_FLAG(should_post_class_load)
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96 JVMTI_SUPPORT_FLAG(should_post_class_prepare)
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97 JVMTI_SUPPORT_FLAG(should_post_class_unload)
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98 JVMTI_SUPPORT_FLAG(should_post_native_method_bind)
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99 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)
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100 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)
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101 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)
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102 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)
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103 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)
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104 JVMTI_SUPPORT_FLAG(should_post_monitor_wait)
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105 JVMTI_SUPPORT_FLAG(should_post_monitor_waited)
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106 JVMTI_SUPPORT_FLAG(should_post_data_dump)
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107 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)
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108 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)
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109 JVMTI_SUPPORT_FLAG(should_post_on_exceptions)
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110
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111 // ------ the below maybe don't have to be (but are for now)
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112 // fixed conditions here ------------
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113 // any events can be enabled
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114 JVMTI_SUPPORT_FLAG(should_post_thread_life)
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115 JVMTI_SUPPORT_FLAG(should_post_object_free)
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116 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)
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117
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118 // we are holding objects on the heap - need to talk to GC - e.g.
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119 // breakpoint info
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120 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)
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121 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)
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122
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123 // If flag cannot be implemented, give an error if on=true
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124 static void report_unsupported(bool on);
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125
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126 // these should only be called by the friend class
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127 friend class JvmtiManageCapabilities;
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128 inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); }
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129 inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); }
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130 inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); }
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131 inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); }
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132
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133 enum {
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134 JVMTI_VERSION_MASK = 0x70000000,
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135 JVMTI_VERSION_VALUE = 0x30000000,
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136 JVMDI_VERSION_VALUE = 0x20000000
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137 };
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138
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139 static void post_field_modification(JavaThread *thread, methodOop method, address location,
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140 KlassHandle field_klass, Handle object, jfieldID field,
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141 char sig_type, jvalue *value);
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142
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143
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144 // posts a DynamicCodeGenerated event (internal/private implementation).
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145 // The public post_dynamic_code_generated* functions make use of the
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146 // internal implementation. Also called from JvmtiDeferredEvent::post()
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147 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
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148
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149 private:
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150
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151 // GenerateEvents support to allow posting of CompiledMethodLoad and
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152 // DynamicCodeGenerated events for a given environment.
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153 friend class JvmtiCodeBlobEvents;
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154
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155 static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
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156 const void *code_begin, const jint map_length,
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157 const jvmtiAddrLocationMap* map) KERNEL_RETURN;
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158 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,
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159 const void *code_end) KERNEL_RETURN;
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160
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161 // The RedefineClasses() API breaks some invariants in the "regular"
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162 // system. For example, there are sanity checks when GC'ing nmethods
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163 // that require the containing class to be unloading. However, when a
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164 // method is redefined, the old method and nmethod can become GC'able
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165 // without the containing class unloading. The state of becoming
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166 // GC'able can be asynchronous to the RedefineClasses() call since
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167 // the old method may still be running and cannot be GC'ed until
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168 // after all old invocations have finished. Additionally, a method
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169 // that has not been redefined may have an nmethod that depends on
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170 // the redefined method. The dependent nmethod will get deopted in
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171 // this case and may also be GC'able without the containing class
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172 // being unloaded.
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173 //
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174 // This flag indicates whether RedefineClasses() has ever redefined
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175 // one or more classes during the lifetime of the VM. The flag should
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176 // only be set by the friend class and can be queried by other sub
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177 // systems as needed to relax invariant checks.
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178 static bool _has_redefined_a_class;
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179 friend class VM_RedefineClasses;
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180 inline static void set_has_redefined_a_class() {
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181 _has_redefined_a_class = true;
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182 }
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183
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184 // Flag to indicate if the compiler has recorded all dependencies. When the
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185 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler
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186 // records all dependencies from startup. However if the capability is first
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187 // enabled some time later then the dependencies recorded by the compiler
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188 // are incomplete. This flag is used by RedefineClasses to know if the
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189 // dependency information is complete or not.
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190 static bool _all_dependencies_are_recorded;
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191
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192 public:
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193 inline static bool has_redefined_a_class() {
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194 return _has_redefined_a_class;
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195 }
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196
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197 inline static bool all_dependencies_are_recorded() {
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198 return _all_dependencies_are_recorded;
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199 }
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200
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201 inline static void set_all_dependencies_are_recorded(bool on) {
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202 _all_dependencies_are_recorded = (on != 0);
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203 }
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204
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205
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206 // let JVMTI know that the JVM_OnLoad code is running
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207 static void enter_onload_phase();
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208
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209 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
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210 static void enter_primordial_phase();
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211
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212 // let JVMTI know that the VM isn't up yet but JNI is live
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213 static void enter_start_phase();
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214
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215 // let JVMTI know that the VM is fully up and running now
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216 static void enter_live_phase();
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217
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218 // ------ can_* conditions (below) are set at OnLoad and never changed ------------
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219 inline static bool can_modify_any_class() { return _can_modify_any_class; }
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220 inline static bool can_access_local_variables() { return _can_access_local_variables; }
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221 inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; }
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222 inline static bool can_walk_any_space() { return _can_walk_any_space; }
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223
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224 // field access management
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225 static address get_field_access_count_addr();
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226
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227 // field modification management
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228 static address get_field_modification_count_addr();
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229
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230 // -----------------
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231
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232 static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; }
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233 static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; }
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234 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version);
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235 static void decode_version_values(jint version, int * major, int * minor,
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236 int * micro);
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237
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238 // single stepping management methods
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239 static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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240 static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN;
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241 static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(false);
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242
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243 // Methods that notify the debugger that something interesting has happened in the VM.
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244 static void post_vm_start ();
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245 static void post_vm_initialized ();
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246 static void post_vm_death ();
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247
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248 static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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249 static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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250
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251 static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN;
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252 static void notice_unwind_due_to_exception (JavaThread *thread, methodOop method, address location, oop exception, bool in_handler_frame) KERNEL_RETURN;
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253
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254 static oop jni_GetField_probe (JavaThread *thread, jobject jobj,
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255 oop obj, klassOop klass, jfieldID fieldID, bool is_static)
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256 KERNEL_RETURN_(NULL);
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257 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj,
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258 oop obj, klassOop klass, jfieldID fieldID, bool is_static)
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259 KERNEL_RETURN_(NULL);
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260 static void post_field_access_by_jni (JavaThread *thread, oop obj,
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261 klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN;
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262 static void post_field_access (JavaThread *thread, methodOop method,
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263 address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN;
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264 static oop jni_SetField_probe (JavaThread *thread, jobject jobj,
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265 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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266 jvalue *value) KERNEL_RETURN_(NULL);
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267 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj,
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268 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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269 jvalue *value) KERNEL_RETURN_(NULL);
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270 static void post_field_modification_by_jni(JavaThread *thread, oop obj,
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271 klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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272 jvalue *value);
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273 static void post_raw_field_modification(JavaThread *thread, methodOop method,
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274 address location, KlassHandle field_klass, Handle object, jfieldID field,
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275 char sig_type, jvalue *value) KERNEL_RETURN;
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276
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277 static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
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278 static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
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279
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280 static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN;
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281 static void post_class_unload (klassOop klass) KERNEL_RETURN;
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282 static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN;
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283
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284 static void post_thread_start (JavaThread *thread) KERNEL_RETURN;
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285 static void post_thread_end (JavaThread *thread) KERNEL_RETURN;
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286
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287 // Support for java.lang.instrument agent loading.
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288 static bool _should_post_class_file_load_hook;
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289 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; }
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290 inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; }
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291 static void post_class_file_load_hook(Symbol* h_name, Handle class_loader,
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292 Handle h_protection_domain,
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293 unsigned char **data_ptr, unsigned char **end_ptr,
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294 unsigned char **cached_data_ptr,
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295 jint *cached_length_ptr);
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296 static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN;
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297 static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN;
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298 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
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299
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300 // used to post a CompiledMethodUnload event
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301 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) KERNEL_RETURN;
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302
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303 // similiar to post_dynamic_code_generated except that it can be used to
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304 // post a DynamicCodeGenerated event while holding locks in the VM. Any event
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305 // posted using this function is recorded by the enclosing event collector
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306 // -- JvmtiDynamicCodeEventCollector.
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307 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN;
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308
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309 static void post_garbage_collection_finish() KERNEL_RETURN;
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310 static void post_garbage_collection_start() KERNEL_RETURN;
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311 static void post_data_dump() KERNEL_RETURN;
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312 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
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313 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
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314 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN;
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315 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN;
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316 static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN;
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317 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN;
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318 static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN;
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319 // Post objects collected by vm_object_alloc_event_collector.
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320 static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN;
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321 // Collects vm internal objects for later event posting.
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322 inline static void vm_object_alloc_event_collector(oop object) {
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323 if (should_post_vm_object_alloc()) {
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324 record_vm_internal_object_allocation(object);
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325 }
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326 }
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327 inline static void post_array_size_exhausted() {
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328 if (should_post_resource_exhausted()) {
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329 post_resource_exhausted(JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
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330 "Requested array size exceeds VM limit");
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331 }
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332 }
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333
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334 static void cleanup_thread (JavaThread* thread) KERNEL_RETURN;
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335
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336 static void oops_do(OopClosure* f) KERNEL_RETURN;
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337 static void weak_oops_do(BoolObjectClosure* b, OopClosure* f) KERNEL_RETURN;
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338 static void gc_epilogue() KERNEL_RETURN;
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339
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340 static void transition_pending_onload_raw_monitors() KERNEL_RETURN;
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341
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342 #ifndef SERVICES_KERNEL
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343 // attach support
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344 static jint load_agent_library(AttachOperation* op, outputStream* out);
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345 #endif // SERVICES_KERNEL
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346
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347 // SetNativeMethodPrefix support
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348 static char** get_all_native_method_prefixes(int* count_ptr);
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349 };
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350
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351 // Support class used by JvmtiDynamicCodeEventCollector and others. It
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352 // describes a single code blob by name and address range.
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353 class JvmtiCodeBlobDesc : public CHeapObj<mtInternal> {
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354 private:
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355 char _name[64];
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356 address _code_begin;
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357 address _code_end;
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358
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359 public:
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360 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
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361 assert(name != NULL, "all code blobs must be named");
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362 strncpy(_name, name, sizeof(_name));
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363 _name[sizeof(_name)-1] = '\0';
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364 _code_begin = code_begin;
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365 _code_end = code_end;
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366 }
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367 char* name() { return _name; }
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368 address code_begin() { return _code_begin; }
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369 address code_end() { return _code_end; }
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370 };
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371
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372 // JvmtiEventCollector is a helper class to setup thread for
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373 // event collection.
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374 class JvmtiEventCollector : public StackObj {
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375 private:
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376 JvmtiEventCollector* _prev; // Save previous one to support nested event collector.
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377
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378 public:
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379 void setup_jvmti_thread_state(); // Set this collector in current thread.
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380 void unset_jvmti_thread_state(); // Reset previous collector in current thread.
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381 virtual bool is_dynamic_code_event() { return false; }
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382 virtual bool is_vm_object_alloc_event(){ return false; }
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383 JvmtiEventCollector *get_prev() { return _prev; }
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384 };
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385
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386 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
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387 // interface. It collects "dynamic code generated" events that are posted
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388 // while holding locks. When the event collector goes out of scope the
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389 // events will be posted.
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390 //
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391 // Usage :-
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392 //
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393 // {
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394 // JvmtiDynamicCodeEventCollector event_collector;
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395 // :
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396 // { MutexLocker ml(...)
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397 // :
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398 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
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399 // }
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400 // // event collector goes out of scope => post events to profiler.
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401 // }
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402
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403 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
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404 private:
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405 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events
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406
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407 friend class JvmtiExport;
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408 void register_stub(const char* name, address start, address end);
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409
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410 public:
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411 JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
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412 ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
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413 bool is_dynamic_code_event() { return true; }
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414
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415 };
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416
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417 // Used to record vm internally allocated object oops and post
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418 // vm object alloc event for objects visible to java world.
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419 // Constructor enables JvmtiThreadState flag and all vm allocated
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420 // objects are recorded in a growable array. When destructor is
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421 // called the vm object alloc event is posted for each objects
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422 // visible to java world.
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423 // See jvm.cpp file for its usage.
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424 //
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425 class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector {
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426 private:
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427 GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop.
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428 bool _enable; // This flag is enabled in constructor and disabled
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429 // in destructor before posting event. To avoid
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430 // collection of objects allocated while running java code inside
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431 // agent post_vm_object_alloc() event handler.
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432
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433 //GC support
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434 void oops_do(OopClosure* f);
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435
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436 friend class JvmtiExport;
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437 // Record vm allocated object oop.
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438 inline void record_allocation(oop obj);
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439
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440 //GC support
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441 static void oops_do_for_all_threads(OopClosure* f);
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442
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443 public:
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444 JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
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445 ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
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446 bool is_vm_object_alloc_event() { return true; }
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447
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448 bool is_enabled() { return _enable; }
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449 void set_enabled(bool on) { _enable = on; }
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450 };
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451
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452
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453
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454 // Marker class to disable the posting of VMObjectAlloc events
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455 // within its scope.
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456 //
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457 // Usage :-
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458 //
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459 // {
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460 // NoJvmtiVMObjectAllocMark njm;
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461 // :
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462 // // VMObjAlloc event will not be posted
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463 // JvmtiExport::vm_object_alloc_event_collector(obj);
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464 // :
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465 // }
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466
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467 class NoJvmtiVMObjectAllocMark : public StackObj {
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468 private:
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469 // enclosing collector if enabled, NULL otherwise
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470 JvmtiVMObjectAllocEventCollector *_collector;
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471
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472 bool was_enabled() { return _collector != NULL; }
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473
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474 public:
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475 NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
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476 ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
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477 };
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478
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479
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480 // Base class for reporting GC events to JVMTI.
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481 class JvmtiGCMarker : public StackObj {
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482 public:
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483 JvmtiGCMarker() KERNEL_RETURN;
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484 ~JvmtiGCMarker() KERNEL_RETURN;
0
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485 };
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486
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487 // JvmtiHideSingleStepping is a helper class for hiding
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488 // internal single step events.
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489 class JvmtiHideSingleStepping : public StackObj {
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490 private:
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491 bool _single_step_hidden;
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492 JavaThread * _thread;
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493
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494 public:
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495 JvmtiHideSingleStepping(JavaThread * thread) {
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496 assert(thread != NULL, "sanity check");
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497
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498 _single_step_hidden = false;
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499 _thread = thread;
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500 if (JvmtiExport::should_post_single_step()) {
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501 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
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502 }
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503 }
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504
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505 ~JvmtiHideSingleStepping() {
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506 if (_single_step_hidden) {
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507 JvmtiExport::expose_single_stepping(_thread);
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508 }
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509 }
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510 };
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511
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512 #endif // SHARE_VM_PRIMS_JVMTIEXPORT_HPP