jvmtiUtil.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1999, 2007, 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/////////////////////////////////////////////////////////////// 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