Thu, 25 Sep 2008 12:50:51 -0700
6744783: HotSpot segfaults if given -XX options with an empty string argument
Reviewed-by: kamg, kvn
Contributed-by: volker.simonis@gmail.com
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // A simple allocation profiler for Java. The profiler collects and prints |
duke@435 | 26 | // the number and total size of instances allocated per class, including |
duke@435 | 27 | // array classes. |
duke@435 | 28 | // |
duke@435 | 29 | // The profiler is currently global for all threads. It can be changed to a |
duke@435 | 30 | // per threads profiler by keeping a more elaborate data structure and calling |
duke@435 | 31 | // iterate_since_last_scavenge at thread switches. |
duke@435 | 32 | |
duke@435 | 33 | |
duke@435 | 34 | class AllocationProfiler: AllStatic { |
duke@435 | 35 | friend class GenCollectedHeap; |
duke@435 | 36 | friend class MarkSweep; |
duke@435 | 37 | private: |
duke@435 | 38 | static bool _active; // tells whether profiler is active |
duke@435 | 39 | static GrowableArray<klassOop>* _print_array; // temporary array for printing |
duke@435 | 40 | |
duke@435 | 41 | // Utility printing functions |
duke@435 | 42 | static void add_class_to_array(klassOop k); |
duke@435 | 43 | static void add_classes_to_array(klassOop k); |
duke@435 | 44 | static int compare_classes(klassOop* k1, klassOop* k2); |
duke@435 | 45 | static int average(size_t alloc_size, int alloc_count); |
duke@435 | 46 | static void sort_and_print_array(size_t cutoff); |
duke@435 | 47 | |
duke@435 | 48 | // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage. |
duke@435 | 49 | static void iterate_since_last_gc(); |
duke@435 | 50 | |
duke@435 | 51 | public: |
duke@435 | 52 | // Start profiler |
duke@435 | 53 | static void engage(); |
duke@435 | 54 | // Stop profiler |
duke@435 | 55 | static void disengage(); |
duke@435 | 56 | // Tells whether profiler is active |
duke@435 | 57 | static bool is_active() { return _active; } |
duke@435 | 58 | // Print profile |
duke@435 | 59 | static void print(size_t cutoff); // Cutoff in total allocation size (in words) |
duke@435 | 60 | }; |