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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 ///////////////////////////////////////////////////////////////
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26 //
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27 // class JvmtiUtil
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28 //
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29 // class for miscellaneous jvmti utility static methods
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30 //
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31
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32 class JvmtiUtil : AllStatic {
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33
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34 static ResourceArea* _single_threaded_resource_area;
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35
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36 static const char* _error_names[];
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37 static const bool _event_threaded[];
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38
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39 public:
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40
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41 static ResourceArea* single_threaded_resource_area();
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42
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43 static const char* error_name(int num) { return _error_names[num]; } // To Do: add range checking
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44
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45 static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr);
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46
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47 static const bool event_threaded(int num) {
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48 if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) {
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49 return _event_threaded[num];
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50 }
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51 if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) {
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52 return false;
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53 }
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54 ShouldNotReachHere();
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55 return false;
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56 }
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57 };
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58
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59
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60 ///////////////////////////////////////////////////////////////
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61 //
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62 // class SafeResourceMark
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63 //
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64 // ResourceMarks that work before threads exist
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65 //
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66
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67 class SafeResourceMark : public ResourceMark {
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68
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69 ResourceArea* safe_resource_area() {
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70 Thread* thread;
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71
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72 if (Threads::number_of_threads() == 0) {
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73 return JvmtiUtil::single_threaded_resource_area();
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74 }
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75 thread = ThreadLocalStorage::thread();
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76 if (thread == NULL) {
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77 return JvmtiUtil::single_threaded_resource_area();
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78 }
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79 return thread->resource_area();
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80 }
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81
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82 public:
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83
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84 SafeResourceMark() : ResourceMark(safe_resource_area()) {}
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85
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86 };
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