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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 }; |