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hotspot/src/share/vm/utilities/events.hpp

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+/*
+ * Copyright 1997-2003 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// Events and EventMark provide interfaces to log events taking place in the vm.
+// This facility is extremly useful for post-mortem debugging. The eventlog
+// often provides crucial information about events leading up to the crash.
+//
+// All arguments past the format string must be passed as an intptr_t.
+//
+// To log a single event use:
+//    Events::log("New nmethod has been created " INTPTR_FORMAT, nm);
+//
+// To log a block of events use:
+//    EventMark m("GarbageCollecting %d", (intptr_t)gc_number);
+//
+// The constructor to eventlog indents the eventlog until the
+// destructor has been executed.
+//
+// IMPLEMENTATION RESTRICTION:
+//   Max 3 arguments are saved for each logged event.
+//
+
+class Events : AllStatic {
+ public:
+  // Logs an event, format as printf
+  static void log(const char* format, ...) PRODUCT_RETURN;
+
+  // Prints all events in the buffer
+  static void print_all(outputStream* st) PRODUCT_RETURN;
+
+  // Prints last number events from the event buffer
+  static void print_last(outputStream *st, int number) PRODUCT_RETURN;
+};
+
+class EventMark : public StackObj {
+ public:
+  // log a begin event, format as printf
+  EventMark(const char* format, ...) PRODUCT_RETURN;
+  // log an end event
+  ~EventMark() PRODUCT_RETURN;
+};
+
+int print_all_events(outputStream *st);