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comparison src/share/vm/prims/jvmtiUtil.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 ///////////////////////////////////////////////////////////////
26 //
27 // class JvmtiUtil
28 //
29 // class for miscellaneous jvmti utility static methods
30 //
31
32 class JvmtiUtil : AllStatic {
33
34 static ResourceArea* _single_threaded_resource_area;
35
36 static const char* _error_names[];
37 static const bool _event_threaded[];
38
39 public:
40
41 static ResourceArea* single_threaded_resource_area();
42
43 static const char* error_name(int num) { return _error_names[num]; } // To Do: add range checking
44
45 static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr);
46
47 static const bool event_threaded(int num) {
48 if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) {
49 return _event_threaded[num];
50 }
51 if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) {
52 return false;
53 }
54 ShouldNotReachHere();
55 return false;
56 }
57 };
58
59
60 ///////////////////////////////////////////////////////////////
61 //
62 // class SafeResourceMark
63 //
64 // ResourceMarks that work before threads exist
65 //
66
67 class SafeResourceMark : public ResourceMark {
68
69 ResourceArea* safe_resource_area() {
70 Thread* thread;
71
72 if (Threads::number_of_threads() == 0) {
73 return JvmtiUtil::single_threaded_resource_area();
74 }
75 thread = ThreadLocalStorage::thread();
76 if (thread == NULL) {
77 return JvmtiUtil::single_threaded_resource_area();
78 }
79 return thread->resource_area();
80 }
81
82 public:
83
84 SafeResourceMark() : ResourceMark(safe_resource_area()) {}
85
86 };