1 #ifdef USE_PRAGMA_IDENT_HDR 2 #pragma ident "@(#)permGen.hpp 1.38 07/05/29 09:44:16 JVM" 3 #endif 4 /* 5 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. 6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 7 * 8 * This code is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License version 2 only, as 10 * published by the Free Software Foundation. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 23 * CA 95054 USA or visit www.sun.com if you need additional information or 24 * have any questions. 25 * 26 */ 27 28 // All heaps contains a "permanent generation," containing permanent 29 // (reflective) objects. This is like a regular generation in some ways, 30 // but unlike one in others, and so is split apart. 31 32 class Generation; 33 class GenRemSet; 34 class CSpaceCounters; 35 36 // PermGen models the part of the heap 37 38 class PermGen : public CHeapObj { 39 friend class VMStructs; 40 protected: 41 size_t _capacity_expansion_limit; // maximum expansion allowed without a 42 // full gc occuring 43 44 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); 45 46 public: 47 enum Name { 48 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep 49 }; 50 51 // Permanent allocation (initialized) 52 virtual HeapWord* mem_allocate(size_t size) = 0; 53 54 // Mark sweep support 55 virtual void compute_new_size() = 0; 56 57 // Ideally, we would use MI (IMHO) but we'll do delegation instead. 58 virtual Generation* as_gen() const = 0; 59 60 virtual void oop_iterate(OopClosure* cl) { 61 Generation* g = as_gen(); 62 assert(g != NULL, "as_gen() NULL"); 63 g->oop_iterate(cl); 64 } 65 66 virtual void object_iterate(ObjectClosure* cl) { 67 Generation* g = as_gen(); 68 assert(g != NULL, "as_gen() NULL"); 69 g->object_iterate(cl); 70 } 71 72 // Performance Counter support 73 virtual void update_counters() { 74 Generation* g = as_gen(); 75 assert(g != NULL, "as_gen() NULL"); 76 g->update_counters(); 77 } 78 }; 79