1 /*
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   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.
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   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
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  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
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  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