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1 /* |
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2 * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 // JvmtiTagMap |
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26 |
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27 #ifndef _JAVA_JVMTI_TAG_MAP_H_ |
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28 #define _JAVA_JVMTI_TAG_MAP_H_ |
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29 |
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30 // forward references |
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31 class JvmtiTagHashmap; |
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32 class JvmtiTagHashmapEntry; |
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33 class JvmtiTagHashmapEntryClosure; |
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34 |
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35 class JvmtiTagMap : public CHeapObj { |
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36 private: |
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37 |
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38 enum{ |
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39 n_hashmaps = 2, // encapsulates 2 hashmaps |
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40 max_free_entries = 4096 // maximum number of free entries per env |
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41 }; |
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42 |
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43 // memory region for young generation |
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44 static MemRegion _young_gen; |
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45 static void get_young_generation(); |
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46 |
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47 JvmtiEnv* _env; // the jvmti environment |
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48 Mutex _lock; // lock for this tag map |
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49 JvmtiTagHashmap* _hashmap[n_hashmaps]; // the hashmaps |
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50 |
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51 JvmtiTagHashmapEntry* _free_entries; // free list for this environment |
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52 int _free_entries_count; // number of entries on the free list |
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53 |
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54 // create a tag map |
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55 JvmtiTagMap(JvmtiEnv* env); |
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56 |
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57 // accessors |
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58 inline Mutex* lock() { return &_lock; } |
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59 inline JvmtiEnv* env() const { return _env; } |
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60 |
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61 // rehash tags maps for generation start to end |
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62 void rehash(int start, int end); |
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63 |
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64 // indicates if the object is in the young generation |
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65 static bool is_in_young(oop o); |
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66 |
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67 // iterate over all entries in this tag map |
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68 void entry_iterate(JvmtiTagHashmapEntryClosure* closure); |
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69 |
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70 public: |
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71 |
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72 // indicates if this tag map is locked |
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73 bool is_locked() { return lock()->is_locked(); } |
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74 |
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75 // return the appropriate hashmap for a given object |
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76 JvmtiTagHashmap* hashmap_for(oop o); |
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77 |
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78 // create/destroy entries |
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79 JvmtiTagHashmapEntry* create_entry(jweak ref, jlong tag); |
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80 void destroy_entry(JvmtiTagHashmapEntry* entry); |
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81 |
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82 // returns true if the hashmaps are empty |
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83 bool is_empty(); |
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84 |
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85 // return tag for the given environment |
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86 static JvmtiTagMap* tag_map_for(JvmtiEnv* env); |
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87 |
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88 // destroy tag map |
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89 ~JvmtiTagMap(); |
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90 |
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91 // set/get tag |
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92 void set_tag(jobject obj, jlong tag); |
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93 jlong get_tag(jobject obj); |
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94 |
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95 // deprecated heap iteration functions |
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96 void iterate_over_heap(jvmtiHeapObjectFilter object_filter, |
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97 KlassHandle klass, |
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98 jvmtiHeapObjectCallback heap_object_callback, |
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99 const void* user_data); |
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100 |
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101 void iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback, |
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102 jvmtiStackReferenceCallback stack_ref_callback, |
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103 jvmtiObjectReferenceCallback object_ref_callback, |
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104 const void* user_data); |
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105 |
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106 void iterate_over_objects_reachable_from_object(jobject object, |
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107 jvmtiObjectReferenceCallback object_reference_callback, |
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108 const void* user_data); |
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109 |
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110 |
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111 // advanced (JVMTI 1.1) heap iteration functions |
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112 void iterate_through_heap(jint heap_filter, |
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113 KlassHandle klass, |
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114 const jvmtiHeapCallbacks* callbacks, |
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115 const void* user_data); |
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116 |
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117 void follow_references(jint heap_filter, |
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118 KlassHandle klass, |
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119 jobject initial_object, |
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120 const jvmtiHeapCallbacks* callbacks, |
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121 const void* user_data); |
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122 |
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123 // get tagged objects |
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124 jvmtiError get_objects_with_tags(const jlong* tags, jint count, |
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125 jint* count_ptr, jobject** object_result_ptr, |
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126 jlong** tag_result_ptr); |
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127 |
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128 // call post-GC to rehash the tag maps. |
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129 static void gc_epilogue(bool full); |
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130 |
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131 // call after referencing processing has completed (CMS) |
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132 static void cms_ref_processing_epilogue(); |
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133 }; |
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134 |
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135 #endif /* _JAVA_JVMTI_TAG_MAP_H_ */ |