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1 /*
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1121
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2 * Copyright 1998-2009 Sun Microsystems, Inc. All Rights Reserved.
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0
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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_JVMTIEXPORT_H_
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26 #define _JAVA_JVMTIEXPORT_H_
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27
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28 // Forward declarations
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29
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30 class JvmtiEventControllerPrivate;
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31 class JvmtiManageCapabilities;
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32 class JvmtiEnv;
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33 class JvmtiThreadState;
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34 class AttachOperation;
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35
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36 #ifndef JVMTI_KERNEL
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37 #define JVMTI_SUPPORT_FLAG(key) \
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38 private: \
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39 static bool _##key; \
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40 public: \
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41 inline static void set_##key(bool on) { _##key = (on != 0); } \
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42 inline static bool key() { return _##key; }
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43 #else // JVMTI_KERNEL
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44 #define JVMTI_SUPPORT_FLAG(key) \
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45 private: \
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46 const static bool _##key = false; \
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47 public: \
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48 inline static void set_##key(bool on) { report_unsupported(on); } \
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49 inline static bool key() { return _##key; }
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50 #endif // JVMTI_KERNEL
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51
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52
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53 // This class contains the JVMTI interface for the rest of hotspot.
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54 //
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55 class JvmtiExport : public AllStatic {
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56 private:
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57 static int _field_access_count;
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58 static int _field_modification_count;
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59
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60 static bool _can_access_local_variables;
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61 static bool _can_examine_or_deopt_anywhere;
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62 static bool _can_hotswap_or_post_breakpoint;
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63 static bool _can_modify_any_class;
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64 static bool _can_walk_any_space;
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65
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66 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension)
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67 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order)
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68 JVMTI_SUPPORT_FLAG(can_post_interpreter_events)
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69 JVMTI_SUPPORT_FLAG(can_post_exceptions)
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70 JVMTI_SUPPORT_FLAG(can_post_breakpoint)
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71 JVMTI_SUPPORT_FLAG(can_post_field_access)
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72 JVMTI_SUPPORT_FLAG(can_post_field_modification)
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73 JVMTI_SUPPORT_FLAG(can_post_method_entry)
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74 JVMTI_SUPPORT_FLAG(can_post_method_exit)
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75 JVMTI_SUPPORT_FLAG(can_pop_frame)
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76 JVMTI_SUPPORT_FLAG(can_force_early_return)
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77
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78 friend class JvmtiEventControllerPrivate; // should only modify these flags
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79 JVMTI_SUPPORT_FLAG(should_post_single_step)
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80 JVMTI_SUPPORT_FLAG(should_post_field_access)
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81 JVMTI_SUPPORT_FLAG(should_post_field_modification)
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82 JVMTI_SUPPORT_FLAG(should_post_class_load)
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83 JVMTI_SUPPORT_FLAG(should_post_class_prepare)
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84 JVMTI_SUPPORT_FLAG(should_post_class_unload)
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85 JVMTI_SUPPORT_FLAG(should_post_native_method_bind)
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86 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load)
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87 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload)
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88 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated)
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89 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter)
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90 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered)
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91 JVMTI_SUPPORT_FLAG(should_post_monitor_wait)
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92 JVMTI_SUPPORT_FLAG(should_post_monitor_waited)
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93 JVMTI_SUPPORT_FLAG(should_post_data_dump)
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94 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start)
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95 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish)
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96
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97 // ------ the below maybe don't have to be (but are for now)
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98 // fixed conditions here ------------
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99 // any events can be enabled
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100 JVMTI_SUPPORT_FLAG(should_post_thread_life)
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101 JVMTI_SUPPORT_FLAG(should_post_object_free)
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102 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted)
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103
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104 // we are holding objects on the heap - need to talk to GC - e.g.
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105 // breakpoint info
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106 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects)
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107 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc)
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108
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109 // If flag cannot be implemented, give an error if on=true
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110 static void report_unsupported(bool on);
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111
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112 // these should only be called by the friend class
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113 friend class JvmtiManageCapabilities;
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114 inline static void set_can_examine_or_deopt_anywhere(bool on) { _can_examine_or_deopt_anywhere = (on != 0); }
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115 inline static void set_can_modify_any_class(bool on) { _can_modify_any_class = (on != 0); }
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116 inline static void set_can_access_local_variables(bool on) { _can_access_local_variables = (on != 0); }
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117 inline static void set_can_hotswap_or_post_breakpoint(bool on) { _can_hotswap_or_post_breakpoint = (on != 0); }
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118 inline static void set_can_walk_any_space(bool on) { _can_walk_any_space = (on != 0); }
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119
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120 enum {
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121 JVMTI_VERSION_MASK = 0x70000000,
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122 JVMTI_VERSION_VALUE = 0x30000000,
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123 JVMDI_VERSION_VALUE = 0x20000000
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124 };
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125
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126 static void post_field_modification(JavaThread *thread, methodOop method, address location,
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127 KlassHandle field_klass, Handle object, jfieldID field,
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128 char sig_type, jvalue *value);
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129
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130
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131 private:
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132 // CompiledMethodUnload events are reported from the VM thread so they
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133 // are collected in lists (of jmethodID/addresses) and the events are posted later
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134 // from threads posting CompieldMethodLoad or DynamicCodeGenerated events.
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135 static bool _have_pending_compiled_method_unload_events;
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136 static GrowableArray<jmethodID>* _pending_compiled_method_unload_method_ids;
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137 static GrowableArray<const void *>* _pending_compiled_method_unload_code_begins;
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138 static JavaThread* _current_poster;
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139
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140 // tests if there are CompiledMethodUnload events pending
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141 inline static bool have_pending_compiled_method_unload_events() {
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142 return _have_pending_compiled_method_unload_events;
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143 }
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144
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145 // posts any pending CompiledMethodUnload events.
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146 static void post_pending_compiled_method_unload_events();
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147
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148 // posts a DynamicCodeGenerated event (internal/private implementation).
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149 // The public post_dynamic_code_generated* functions make use of the
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150 // internal implementation.
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151 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
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152
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153
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154 // GenerateEvents support to allow posting of CompiledMethodLoad and
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155 // DynamicCodeGenerated events for a given environment.
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156 friend class JvmtiCodeBlobEvents;
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157
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158 static void post_compiled_method_load(JvmtiEnv* env, const jmethodID method, const jint length,
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159 const void *code_begin, const jint map_length,
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160 const jvmtiAddrLocationMap* map) KERNEL_RETURN;
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161 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin,
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162 const void *code_end) KERNEL_RETURN;
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163
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164 // The RedefineClasses() API breaks some invariants in the "regular"
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165 // system. For example, there are sanity checks when GC'ing nmethods
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166 // that require the containing class to be unloading. However, when a
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167 // method is redefined, the old method and nmethod can become GC'able
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168 // without the containing class unloading. The state of becoming
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169 // GC'able can be asynchronous to the RedefineClasses() call since
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170 // the old method may still be running and cannot be GC'ed until
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171 // after all old invocations have finished. Additionally, a method
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172 // that has not been redefined may have an nmethod that depends on
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173 // the redefined method. The dependent nmethod will get deopted in
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174 // this case and may also be GC'able without the containing class
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175 // being unloaded.
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176 //
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177 // This flag indicates whether RedefineClasses() has ever redefined
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178 // one or more classes during the lifetime of the VM. The flag should
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179 // only be set by the friend class and can be queried by other sub
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180 // systems as needed to relax invariant checks.
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181 static bool _has_redefined_a_class;
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182 friend class VM_RedefineClasses;
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183 inline static void set_has_redefined_a_class() {
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184 _has_redefined_a_class = true;
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185 }
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186
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187 // Flag to indicate if the compiler has recorded all dependencies. When the
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188 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler
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189 // records all dependencies from startup. However if the capability is first
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190 // enabled some time later then the dependencies recorded by the compiler
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191 // are incomplete. This flag is used by RedefineClasses to know if the
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192 // dependency information is complete or not.
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193 static bool _all_dependencies_are_recorded;
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194
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195 public:
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196 inline static bool has_redefined_a_class() {
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197 return _has_redefined_a_class;
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198 }
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199
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200 inline static bool all_dependencies_are_recorded() {
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201 return _all_dependencies_are_recorded;
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202 }
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203
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204 inline static void set_all_dependencies_are_recorded(bool on) {
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205 _all_dependencies_are_recorded = (on != 0);
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206 }
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207
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208
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209 // let JVMTI know that the JVM_OnLoad code is running
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210 static void enter_onload_phase();
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211
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212 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running)
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213 static void enter_primordial_phase();
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214
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215 // let JVMTI know that the VM isn't up yet but JNI is live
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216 static void enter_start_phase();
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217
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218 // let JVMTI know that the VM is fully up and running now
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219 static void enter_live_phase();
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220
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221 // ------ can_* conditions (below) are set at OnLoad and never changed ------------
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222 inline static bool can_examine_or_deopt_anywhere() { return _can_examine_or_deopt_anywhere; }
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223 inline static bool can_modify_any_class() { return _can_modify_any_class; }
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224 inline static bool can_access_local_variables() { return _can_access_local_variables; }
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225 inline static bool can_hotswap_or_post_breakpoint() { return _can_hotswap_or_post_breakpoint; }
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226 inline static bool can_walk_any_space() { return _can_walk_any_space; }
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227
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228 // field access management
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229 static address get_field_access_count_addr();
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230
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231 // field modification management
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232 static address get_field_modification_count_addr();
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233
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234 // -----------------
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235
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236 static bool is_jvmti_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE; }
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237 static bool is_jvmdi_version(jint version) { return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE; }
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238 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version);
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239 static void decode_version_values(jint version, int * major, int * minor,
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240 int * micro);
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241
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242 // single stepping management methods
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243 static void at_single_stepping_point(JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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244 static void expose_single_stepping(JavaThread *thread) KERNEL_RETURN;
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245 static bool hide_single_stepping(JavaThread *thread) KERNEL_RETURN_(return false;);
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246
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247 // Methods that notify the debugger that something interesting has happened in the VM.
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248 static void post_vm_start ();
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249 static void post_vm_initialized ();
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250 static void post_vm_death ();
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251
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252 static void post_single_step (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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253 static void post_raw_breakpoint (JavaThread *thread, methodOop method, address location) KERNEL_RETURN;
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254
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255 static void post_exception_throw (JavaThread *thread, methodOop method, address location, oop exception) KERNEL_RETURN;
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256 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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257
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258 static oop jni_GetField_probe (JavaThread *thread, jobject jobj,
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259 oop obj, klassOop klass, jfieldID fieldID, bool is_static)
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260 KERNEL_RETURN_(return NULL;);
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261 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj,
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262 oop obj, klassOop klass, jfieldID fieldID, bool is_static)
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263 KERNEL_RETURN_(return NULL;);
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264 static void post_field_access_by_jni (JavaThread *thread, oop obj,
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265 klassOop klass, jfieldID fieldID, bool is_static) KERNEL_RETURN;
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266 static void post_field_access (JavaThread *thread, methodOop method,
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267 address location, KlassHandle field_klass, Handle object, jfieldID field) KERNEL_RETURN;
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268 static oop jni_SetField_probe (JavaThread *thread, jobject jobj,
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269 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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270 jvalue *value) KERNEL_RETURN_(return NULL;);
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271 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj,
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272 oop obj, klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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273 jvalue *value) KERNEL_RETURN_(return NULL;);
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274 static void post_field_modification_by_jni(JavaThread *thread, oop obj,
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275 klassOop klass, jfieldID fieldID, bool is_static, char sig_type,
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276 jvalue *value);
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277 static void post_raw_field_modification(JavaThread *thread, methodOop method,
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278 address location, KlassHandle field_klass, Handle object, jfieldID field,
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279 char sig_type, jvalue *value) KERNEL_RETURN;
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280
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281 static void post_method_entry (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
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282 static void post_method_exit (JavaThread *thread, methodOop method, frame current_frame) KERNEL_RETURN;
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283
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284 static void post_class_load (JavaThread *thread, klassOop klass) KERNEL_RETURN;
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285 static void post_class_unload (klassOop klass) KERNEL_RETURN;
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286 static void post_class_prepare (JavaThread *thread, klassOop klass) KERNEL_RETURN;
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287
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288 static void post_thread_start (JavaThread *thread) KERNEL_RETURN;
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289 static void post_thread_end (JavaThread *thread) KERNEL_RETURN;
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290
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291 // Support for java.lang.instrument agent loading.
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292 static bool _should_post_class_file_load_hook;
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293 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; }
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294 inline static bool should_post_class_file_load_hook() { return _should_post_class_file_load_hook; }
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295 static void post_class_file_load_hook(symbolHandle h_name, Handle class_loader,
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296 Handle h_protection_domain,
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297 unsigned char **data_ptr, unsigned char **end_ptr,
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298 unsigned char **cached_data_ptr,
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299 jint *cached_length_ptr);
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300 static void post_native_method_bind(methodOop method, address* function_ptr) KERNEL_RETURN;
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301 static void post_compiled_method_load(nmethod *nm) KERNEL_RETURN;
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302 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) KERNEL_RETURN;
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303
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304 // used at a safepoint to post a CompiledMethodUnload event
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305 static void post_compiled_method_unload_at_safepoint(jmethodID mid, const void *code_begin) KERNEL_RETURN;
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306
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307 // similiar to post_dynamic_code_generated except that it can be used to
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308 // post a DynamicCodeGenerated event while holding locks in the VM. Any event
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309 // posted using this function is recorded by the enclosing event collector
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310 // -- JvmtiDynamicCodeEventCollector.
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311 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) KERNEL_RETURN;
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312
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313 static void post_garbage_collection_finish() KERNEL_RETURN;
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314 static void post_garbage_collection_start() KERNEL_RETURN;
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315 static void post_data_dump() KERNEL_RETURN;
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316 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
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317 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) KERNEL_RETURN;
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318 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) KERNEL_RETURN;
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319 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) KERNEL_RETURN;
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320 static void post_object_free(JvmtiEnv* env, jlong tag) KERNEL_RETURN;
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321 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) KERNEL_RETURN;
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322 static void record_vm_internal_object_allocation(oop object) KERNEL_RETURN;
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323 // Post objects collected by vm_object_alloc_event_collector.
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324 static void post_vm_object_alloc(JavaThread *thread, oop object) KERNEL_RETURN;
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325 // Collects vm internal objects for later event posting.
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326 inline static void vm_object_alloc_event_collector(oop object) {
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327 if (should_post_vm_object_alloc()) {
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328 record_vm_internal_object_allocation(object);
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329 }
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330 }
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331
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332 static void cleanup_thread (JavaThread* thread) KERNEL_RETURN;
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333
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334 static void oops_do(OopClosure* f) KERNEL_RETURN;
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335
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336 static void transition_pending_onload_raw_monitors() KERNEL_RETURN;
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337
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338 #ifndef SERVICES_KERNEL
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339 // attach support
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340 static jint load_agent_library(AttachOperation* op, outputStream* out);
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341 #endif // SERVICES_KERNEL
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342
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343 // SetNativeMethodPrefix support
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344 static char** get_all_native_method_prefixes(int* count_ptr);
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345
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346 // call after CMS has completed referencing processing
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347 static void cms_ref_processing_epilogue() KERNEL_RETURN;
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348 };
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349
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350 // Support class used by JvmtiDynamicCodeEventCollector and others. It
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351 // describes a single code blob by name and address range.
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352 class JvmtiCodeBlobDesc : public CHeapObj {
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353 private:
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354 char _name[64];
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355 address _code_begin;
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356 address _code_end;
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357
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358 public:
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359 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) {
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360 assert(name != NULL, "all code blobs must be named");
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361 strncpy(_name, name, sizeof(_name));
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362 _name[sizeof(_name)-1] = '\0';
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363 _code_begin = code_begin;
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364 _code_end = code_end;
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365 }
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366 char* name() { return _name; }
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367 address code_begin() { return _code_begin; }
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368 address code_end() { return _code_end; }
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369 };
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370
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371 // JvmtiEventCollector is a helper class to setup thread for
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372 // event collection.
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373 class JvmtiEventCollector : public StackObj {
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374 private:
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375 JvmtiEventCollector* _prev; // Save previous one to support nested event collector.
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376
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377 public:
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378 void setup_jvmti_thread_state(); // Set this collector in current thread.
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379 void unset_jvmti_thread_state(); // Reset previous collector in current thread.
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380 virtual bool is_dynamic_code_event() { return false; }
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381 virtual bool is_vm_object_alloc_event(){ return false; }
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382 JvmtiEventCollector *get_prev() { return _prev; }
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383 };
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384
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385 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport
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386 // interface. It collects "dynamic code generated" events that are posted
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387 // while holding locks. When the event collector goes out of scope the
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388 // events will be posted.
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389 //
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390 // Usage :-
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391 //
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392 // {
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393 // JvmtiDynamicCodeEventCollector event_collector;
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394 // :
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395 // { MutexLocker ml(...)
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396 // :
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397 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...)
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398 // }
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399 // // event collector goes out of scope => post events to profiler.
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400 // }
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401
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402 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector {
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403 private:
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404 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events
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405
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406 friend class JvmtiExport;
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407 void register_stub(const char* name, address start, address end);
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408
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409 public:
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410 JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
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411 ~JvmtiDynamicCodeEventCollector() KERNEL_RETURN;
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412 bool is_dynamic_code_event() { return true; }
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413
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414 };
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415
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416 // Used to record vm internally allocated object oops and post
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417 // vm object alloc event for objects visible to java world.
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418 // Constructor enables JvmtiThreadState flag and all vm allocated
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419 // objects are recorded in a growable array. When destructor is
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420 // called the vm object alloc event is posted for each objects
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421 // visible to java world.
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422 // See jvm.cpp file for its usage.
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423 //
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424 class JvmtiVMObjectAllocEventCollector : public JvmtiEventCollector {
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425 private:
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426 GrowableArray<oop>* _allocated; // field to record vm internally allocated object oop.
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427 bool _enable; // This flag is enabled in constructor and disabled
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428 // in destructor before posting event. To avoid
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429 // collection of objects allocated while running java code inside
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430 // agent post_vm_object_alloc() event handler.
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431
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432 //GC support
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433 void oops_do(OopClosure* f);
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434
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|
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435 friend class JvmtiExport;
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436 // Record vm allocated object oop.
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437 inline void record_allocation(oop obj);
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438
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439 //GC support
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440 static void oops_do_for_all_threads(OopClosure* f);
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441
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442 public:
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443 JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
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444 ~JvmtiVMObjectAllocEventCollector() KERNEL_RETURN;
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|
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445 bool is_vm_object_alloc_event() { return true; }
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446
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|
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447 bool is_enabled() { return _enable; }
|
|
|
448 void set_enabled(bool on) { _enable = on; }
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|
|
449 };
|
|
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450
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451
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452
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453 // Marker class to disable the posting of VMObjectAlloc events
|
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454 // within its scope.
|
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|
455 //
|
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456 // Usage :-
|
|
|
457 //
|
|
|
458 // {
|
|
|
459 // NoJvmtiVMObjectAllocMark njm;
|
|
|
460 // :
|
|
|
461 // // VMObjAlloc event will not be posted
|
|
|
462 // JvmtiExport::vm_object_alloc_event_collector(obj);
|
|
|
463 // :
|
|
|
464 // }
|
|
|
465
|
|
|
466 class NoJvmtiVMObjectAllocMark : public StackObj {
|
|
|
467 private:
|
|
|
468 // enclosing collector if enabled, NULL otherwise
|
|
|
469 JvmtiVMObjectAllocEventCollector *_collector;
|
|
|
470
|
|
|
471 bool was_enabled() { return _collector != NULL; }
|
|
|
472
|
|
|
473 public:
|
|
|
474 NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
|
|
|
475 ~NoJvmtiVMObjectAllocMark() KERNEL_RETURN;
|
|
|
476 };
|
|
|
477
|
|
|
478
|
|
|
479 // Base class for reporting GC events to JVMTI.
|
|
|
480 class JvmtiGCMarker : public StackObj {
|
|
|
481 private:
|
|
|
482 bool _full; // marks a "full" GC
|
|
|
483 unsigned int _invocation_count; // GC invocation count
|
|
|
484 protected:
|
|
|
485 JvmtiGCMarker(bool full) KERNEL_RETURN; // protected
|
|
|
486 ~JvmtiGCMarker() KERNEL_RETURN; // protected
|
|
|
487 };
|
|
|
488
|
|
|
489
|
|
|
490 // Support class used to report GC events to JVMTI. The class is stack
|
|
|
491 // allocated and should be placed in the doit() implementation of all
|
|
|
492 // vm operations that do a stop-the-world GC for failed allocation.
|
|
|
493 //
|
|
|
494 // Usage :-
|
|
|
495 //
|
|
|
496 // void VM_GenCollectForAllocation::doit() {
|
|
|
497 // JvmtiGCForAllocationMarker jgcm;
|
|
|
498 // :
|
|
|
499 // }
|
|
|
500 //
|
|
|
501 // If jvmti is not enabled the constructor and destructor is essentially
|
|
|
502 // a no-op (no overhead).
|
|
|
503 //
|
|
|
504 class JvmtiGCForAllocationMarker : public JvmtiGCMarker {
|
|
|
505 public:
|
|
|
506 JvmtiGCForAllocationMarker() : JvmtiGCMarker(false) {
|
|
|
507 }
|
|
|
508 };
|
|
|
509
|
|
|
510 // Support class used to report GC events to JVMTI. The class is stack
|
|
|
511 // allocated and should be placed in the doit() implementation of all
|
|
|
512 // vm operations that do a "full" stop-the-world GC. This class differs
|
|
|
513 // from JvmtiGCForAllocationMarker in that this class assumes that a
|
|
|
514 // "full" GC will happen.
|
|
|
515 //
|
|
|
516 // Usage :-
|
|
|
517 //
|
|
|
518 // void VM_GenCollectFull::doit() {
|
|
|
519 // JvmtiGCFullMarker jgcm;
|
|
|
520 // :
|
|
|
521 // }
|
|
|
522 //
|
|
|
523 class JvmtiGCFullMarker : public JvmtiGCMarker {
|
|
|
524 public:
|
|
|
525 JvmtiGCFullMarker() : JvmtiGCMarker(true) {
|
|
|
526 }
|
|
|
527 };
|
|
|
528
|
|
|
529
|
|
|
530 // JvmtiHideSingleStepping is a helper class for hiding
|
|
|
531 // internal single step events.
|
|
|
532 class JvmtiHideSingleStepping : public StackObj {
|
|
|
533 private:
|
|
|
534 bool _single_step_hidden;
|
|
|
535 JavaThread * _thread;
|
|
|
536
|
|
|
537 public:
|
|
|
538 JvmtiHideSingleStepping(JavaThread * thread) {
|
|
|
539 assert(thread != NULL, "sanity check");
|
|
|
540
|
|
|
541 _single_step_hidden = false;
|
|
|
542 _thread = thread;
|
|
|
543 if (JvmtiExport::should_post_single_step()) {
|
|
|
544 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread);
|
|
|
545 }
|
|
|
546 }
|
|
|
547
|
|
|
548 ~JvmtiHideSingleStepping() {
|
|
|
549 if (_single_step_hidden) {
|
|
|
550 JvmtiExport::expose_single_stepping(_thread);
|
|
|
551 }
|
|
|
552 }
|
|
|
553 };
|
|
|
554
|
|
|
555 #endif /* _JAVA_JVMTIEXPORT_H_ */
|
