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/*
* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
// All heaps contains a "permanent generation," containing permanent
// (reflective) objects. This is like a regular generation in some ways,
// but unlike one in others, and so is split apart.
class Generation;
class GenRemSet;
class CSpaceCounters;
// PermGen models the part of the heap used to allocate class meta-data.
class PermGen : public CHeapObj {
friend class VMStructs;
protected:
size_t _capacity_expansion_limit; // maximum expansion allowed without a
// full gc occurring
void set_capacity_expansion_limit(size_t limit) {
assert_locked_or_safepoint(Heap_lock);
_capacity_expansion_limit = limit;
}
HeapWord* mem_allocate_in_gen(size_t size, Generation* gen);
// Along with mem_allocate_in_gen() above, implements policy for
// "scheduling" allocation/expansion/collection of the perm gen.
// The virtual method request_...() below can be overridden by
// subtypes that want to implement a different expansion/collection
// policy from the default provided.
virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,
GCCause::Cause prev_cause);
public:
enum Name {
MarkSweepCompact, MarkSweep, ConcurrentMarkSweep
};
// Permanent allocation (initialized)
virtual HeapWord* mem_allocate(size_t size) = 0;
// Mark sweep support
virtual void compute_new_size() = 0;
// Ideally, we would use MI (IMHO) but we'll do delegation instead.
virtual Generation* as_gen() const = 0;
virtual void oop_iterate(OopClosure* cl) {
Generation* g = as_gen();
assert(g != NULL, "as_gen() NULL");
g->oop_iterate(cl);
}
virtual void object_iterate(ObjectClosure* cl) {
Generation* g = as_gen();
assert(g != NULL, "as_gen() NULL");
g->object_iterate(cl);
}
// Performance Counter support
virtual void update_counters() {
Generation* g = as_gen();
assert(g != NULL, "as_gen() NULL");
g->update_counters();
}
};
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