1/*
2 * Copyright (c) 1999, 2019, 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.
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23 */
24
25#ifndef SHARE_PRIMS_JVMTIUTIL_HPP
26#define SHARE_PRIMS_JVMTIUTIL_HPP
27
28#include "jvmtifiles/jvmti.h"
29#include "memory/resourceArea.hpp"
30#include "prims/jvmtiEventController.hpp"
31
32///////////////////////////////////////////////////////////////
33//
34// class JvmtiUtil
35//
36// class for miscellaneous jvmti utility static methods
37//
38
39class JvmtiUtil : AllStatic {
40
41 static ResourceArea* _single_threaded_resource_area;
42
43 static const char* _error_names[];
44 static const bool _event_threaded[];
45
46public:
47
48 static ResourceArea* single_threaded_resource_area();
49
50 static const char* error_name(int num) { return _error_names[num]; } // To Do: add range checking
51
52 static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr);
53
54 static const bool event_threaded(int num) {
55 if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) {
56 return _event_threaded[num];
57 }
58 if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) {
59 return false;
60 }
61 ShouldNotReachHere();
62 return false;
63 }
64};
65
66
67///////////////////////////////////////////////////////////////
68//
69// class SafeResourceMark
70//
71// ResourceMarks that work before threads exist
72//
73
74class SafeResourceMark : public ResourceMark {
75
76 ResourceArea* safe_resource_area() {
77 Thread* thread;
78
79 if (Threads::number_of_threads() == 0) {
80 return JvmtiUtil::single_threaded_resource_area();
81 }
82 thread = Thread::current_or_null();
83 if (thread == NULL) {
84 return JvmtiUtil::single_threaded_resource_area();
85 }
86 return thread->resource_area();
87 }
88
89 public:
90
91 SafeResourceMark() : ResourceMark(safe_resource_area()) {}
92
93};
94
95#endif // SHARE_PRIMS_JVMTIUTIL_HPP
96