1 /*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // JvmtiTagMap
26
27 #ifndef SHARE_VM_PRIMS_JVMTITAGMAP_HPP
28 #define SHARE_VM_PRIMS_JVMTITAGMAP_HPP
29
30 #ifndef JVMTI_KERNEL
31 #include "gc_interface/collectedHeap.hpp"
32 #include "jvmtifiles/jvmti.h"
33 #include "jvmtifiles/jvmtiEnv.hpp"
34 #include "memory/allocation.hpp"
35 #include "memory/genCollectedHeap.hpp"
36 #include "memory/universe.hpp"
37 #endif
38
39 // forward references
40 class JvmtiTagHashmap;
41 class JvmtiTagHashmapEntry;
42 class JvmtiTagHashmapEntryClosure;
43
44 class JvmtiTagMap : public CHeapObj<mtInternal> {
45 private:
46
47 enum{
48 max_free_entries = 4096 // maximum number of free entries per env
49 };
50
51 JvmtiEnv* _env; // the jvmti environment
52 Mutex _lock; // lock for this tag map
53 JvmtiTagHashmap* _hashmap; // the hashmap
54
55 JvmtiTagHashmapEntry* _free_entries; // free list for this environment
56 int _free_entries_count; // number of entries on the free list
57
58 // create a tag map
59 JvmtiTagMap(JvmtiEnv* env);
60
61 // accessors
62 inline Mutex* lock() { return &_lock; }
63 inline JvmtiEnv* env() const { return _env; }
64
65 void do_weak_oops(BoolObjectClosure* is_alive, OopClosure* f);
66
67 // iterate over all entries in this tag map
68 void entry_iterate(JvmtiTagHashmapEntryClosure* closure);
69
70 public:
71
72 // indicates if this tag map is locked
73 bool is_locked() { return lock()->is_locked(); }
74
75 JvmtiTagHashmap* hashmap() { return _hashmap; }
76
77 // create/destroy entries
78 JvmtiTagHashmapEntry* create_entry(oop ref, jlong tag);
79 void destroy_entry(JvmtiTagHashmapEntry* entry);
80
81 // returns true if the hashmaps are empty
82 bool is_empty();
83
84 // return tag for the given environment
85 static JvmtiTagMap* tag_map_for(JvmtiEnv* env);
86
87 // destroy tag map
88 ~JvmtiTagMap();
89
90 // set/get tag
91 void set_tag(jobject obj, jlong tag);
92 jlong get_tag(jobject obj);
93
94 // deprecated heap iteration functions
95 void iterate_over_heap(jvmtiHeapObjectFilter object_filter,
96 KlassHandle klass,
97 jvmtiHeapObjectCallback heap_object_callback,
98 const void* user_data);
99
100 void iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback,
101 jvmtiStackReferenceCallback stack_ref_callback,
102 jvmtiObjectReferenceCallback object_ref_callback,
103 const void* user_data);
104
105 void iterate_over_objects_reachable_from_object(jobject object,
106 jvmtiObjectReferenceCallback object_reference_callback,
107 const void* user_data);
108
109
110 // advanced (JVMTI 1.1) heap iteration functions
111 void iterate_through_heap(jint heap_filter,
112 KlassHandle klass,
113 const jvmtiHeapCallbacks* callbacks,
114 const void* user_data);
115
116 void follow_references(jint heap_filter,
117 KlassHandle klass,
118 jobject initial_object,
119 const jvmtiHeapCallbacks* callbacks,
120 const void* user_data);
121
122 // get tagged objects
123 jvmtiError get_objects_with_tags(const jlong* tags, jint count,
124 jint* count_ptr, jobject** object_result_ptr,
125 jlong** tag_result_ptr);
126
127 static void weak_oops_do(
128 BoolObjectClosure* is_alive, OopClosure* f) NOT_JVMTI_RETURN;
129 };
130
131 #endif // SHARE_VM_PRIMS_JVMTITAGMAP_HPP