1 /* 2 * Copyright (c) 1999, 2010, 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 #ifndef SHARE_VM_PRIMS_JVMTIUTIL_HPP 26 #define SHARE_VM_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 39 class JvmtiUtil : AllStatic { 40 41 static ResourceArea* _single_threaded_resource_area; 42 43 static const char* _error_names[]; 44 static const bool _event_threaded[]; 45 46 public: 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 74 class 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 = ThreadLocalStorage::thread(); 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_VM_PRIMS_JVMTIUTIL_HPP