1 /* 2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // All heaps contains a "permanent generation," containing permanent 26 // (reflective) objects. This is like a regular generation in some ways, 27 // but unlike one in others, and so is split apart. 28 29 class Generation; 30 class GenRemSet; 31 class CSpaceCounters; 32 33 // PermGen models the part of the heap 34 35 class PermGen : public CHeapObj { 36 friend class VMStructs; 37 protected: 38 size_t _capacity_expansion_limit; // maximum expansion allowed without a 39 // full gc occurring 40 41 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); 42 43 public: 44 enum Name { 45 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep 46 }; 47 48 // Permanent allocation (initialized) 49 virtual HeapWord* mem_allocate(size_t size) = 0; 50 51 // Mark sweep support 52 virtual void compute_new_size() = 0; 53 54 // Ideally, we would use MI (IMHO) but we'll do delegation instead. 55 virtual Generation* as_gen() const = 0; 56 57 virtual void oop_iterate(OopClosure* cl) { 58 Generation* g = as_gen(); 59 assert(g != NULL, "as_gen() NULL"); 60 g->oop_iterate(cl); 61 } 62 63 virtual void object_iterate(ObjectClosure* cl) { 64 Generation* g = as_gen(); 65 assert(g != NULL, "as_gen() NULL"); 66 g->object_iterate(cl); 67 } 68 69 // Performance Counter support 70 virtual void update_counters() { 71 Generation* g = as_gen(); 72 assert(g != NULL, "as_gen() NULL"); 73 g->update_counters(); 74 } 75 };