jvmtiUtil.hpp revision 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
32class JvmtiUtil : AllStatic {
33
34  static ResourceArea* _single_threaded_resource_area;
35
36  static const char* _error_names[];
37  static const bool  _event_threaded[];
38
39public:
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
67class 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};
87