1 /* 2 * Copyright (c) 2000, 2010, 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 #ifndef SHARE_VM_MEMORY_PERMGEN_HPP 26 #define SHARE_VM_MEMORY_PERMGEN_HPP 27 28 #include "gc_interface/gcCause.hpp" 29 #include "memory/generation.hpp" 30 #include "memory/iterator.hpp" 31 #include "runtime/handles.hpp" 32 #include "runtime/virtualspace.hpp" 33 34 // All heaps contains a "permanent generation," containing permanent 35 // (reflective) objects. This is like a regular generation in some ways, 36 // but unlike one in others, and so is split apart. 37 38 class Generation; 39 class GenRemSet; 40 class CSpaceCounters; 41 42 // PermGen models the part of the heap 43 44 class PermGen : public CHeapObj { 45 friend class VMStructs; 46 protected: 47 size_t _capacity_expansion_limit; // maximum expansion allowed without a 48 // full gc occurring 49 50 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); 51 52 public: 53 enum Name { 54 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep 55 }; 56 57 // Permanent allocation (initialized) 58 virtual HeapWord* mem_allocate(size_t size) = 0; 59 60 // Mark sweep support 61 virtual void compute_new_size() = 0; 62 63 // Ideally, we would use MI (IMHO) but we'll do delegation instead. 64 virtual Generation* as_gen() const = 0; 65 66 virtual void oop_iterate(OopClosure* cl) { 67 Generation* g = as_gen(); 68 assert(g != NULL, "as_gen() NULL"); 69 g->oop_iterate(cl); 70 } 71 72 virtual void object_iterate(ObjectClosure* cl) { 73 Generation* g = as_gen(); 74 assert(g != NULL, "as_gen() NULL"); 75 g->object_iterate(cl); 76 } 77 78 // Performance Counter support 79 virtual void update_counters() { 80 Generation* g = as_gen(); 81 assert(g != NULL, "as_gen() NULL"); 82 g->update_counters(); 83 } 84 }; 85 86 #endif // SHARE_VM_MEMORY_PERMGEN_HPP