jdk8-mips64-public/hotspot: src/share/vm/memory/permGen.hpp@09d00c18e323

     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

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    23  */

    25 #ifndef SHARE_VM_MEMORY_PERMGEN_HPP

    26 #define SHARE_VM_MEMORY_PERMGEN_HPP

    28 #include "gc_interface/gcCause.hpp"

    29 #include "memory/generation.hpp"

    30 #include "memory/iterator.hpp"

    31 #include "runtime/handles.hpp"

    32 #include "runtime/mutexLocker.hpp"

    33 #include "runtime/virtualspace.hpp"

    35 // All heaps contains a "permanent generation," containing permanent

    36 // (reflective) objects.  This is like a regular generation in some ways,

    37 // but unlike one in others, and so is split apart.

    39 class Generation;

    40 class GenRemSet;

    41 class CSpaceCounters;

    43 // PermGen models the part of the heap used to allocate class meta-data.

    45 class PermGen : public CHeapObj {

    46   friend class VMStructs;

    47  protected:

    48   size_t _capacity_expansion_limit;  // maximum expansion allowed without a

    49                                      // full gc occurring

    50   void set_capacity_expansion_limit(size_t limit) {

    51     assert_locked_or_safepoint(Heap_lock);

    52     _capacity_expansion_limit = limit;

    53   }

    55   HeapWord* mem_allocate_in_gen(size_t size, Generation* gen);

    56   // Along with mem_allocate_in_gen() above, implements policy for

    57   // "scheduling" allocation/expansion/collection of the perm gen.

    58   // The virtual method request_...() below can be overridden by

    59   // subtypes that want to implement a different expansion/collection

    60   // policy from the default provided.

    61   virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,

    62                                                 GCCause::Cause prev_cause);

    64  public:

    65   enum Name {

    66     MarkSweepCompact, MarkSweep, ConcurrentMarkSweep

    67   };

    69   // Permanent allocation (initialized)

    70   virtual HeapWord* mem_allocate(size_t size) = 0;

    72   // Mark sweep support

    73   virtual void compute_new_size() = 0;

    75   // Ideally, we would use MI (IMHO) but we'll do delegation instead.

    76   virtual Generation* as_gen() const = 0;

    78   virtual void oop_iterate(OopClosure* cl) {

    79     Generation* g = as_gen();

    80     assert(g != NULL, "as_gen() NULL");

    81     g->oop_iterate(cl);

    82   }

    84   virtual void object_iterate(ObjectClosure* cl) {

    85     Generation* g = as_gen();

    86     assert(g != NULL, "as_gen() NULL");

    87     g->object_iterate(cl);

    88   }

    90   // Performance Counter support

    91   virtual void update_counters() {

    92     Generation* g = as_gen();

    93     assert(g != NULL, "as_gen() NULL");

    94     g->update_counters();

    95   }

    96 };

    98 #endif // SHARE_VM_MEMORY_PERMGEN_HPP

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