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1 /*
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2 * Copyright 1997-2003 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 // Events and EventMark provide interfaces to log events taking place in the vm.
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26 // This facility is extremly useful for post-mortem debugging. The eventlog
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27 // often provides crucial information about events leading up to the crash.
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28 //
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29 // All arguments past the format string must be passed as an intptr_t.
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30 //
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31 // To log a single event use:
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32 // Events::log("New nmethod has been created " INTPTR_FORMAT, nm);
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33 //
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34 // To log a block of events use:
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35 // EventMark m("GarbageCollecting %d", (intptr_t)gc_number);
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36 //
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37 // The constructor to eventlog indents the eventlog until the
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38 // destructor has been executed.
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39 //
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40 // IMPLEMENTATION RESTRICTION:
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41 // Max 3 arguments are saved for each logged event.
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42 //
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43
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44 class Events : AllStatic {
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45 public:
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46 // Logs an event, format as printf
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47 static void log(const char* format, ...) PRODUCT_RETURN;
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48
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49 // Prints all events in the buffer
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50 static void print_all(outputStream* st) PRODUCT_RETURN;
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51
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52 // Prints last number events from the event buffer
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53 static void print_last(outputStream *st, int number) PRODUCT_RETURN;
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54 };
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55
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56 class EventMark : public StackObj {
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57 public:
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58 // log a begin event, format as printf
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59 EventMark(const char* format, ...) PRODUCT_RETURN;
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60 // log an end event
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61 ~EventMark() PRODUCT_RETURN;
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62 };
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63
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64 int print_all_events(outputStream *st);
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