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/*
* Copyright (c) 2005, 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.
*
*/
// Move to some global location
#define HAS_BEEN_MOVED 0x1501d01d
// End move to some global location
class MutableSpace;
class PSOldGen;
class ParCompactionManager;
class ObjectStartArray;
class ParallelCompactData;
class ParMarkBitMap;
class ParCompactionManager : public CHeapObj {
friend class ParallelTaskTerminator;
friend class ParMarkBitMap;
friend class PSParallelCompact;
friend class StealRegionCompactionTask;
friend class UpdateAndFillClosure;
friend class RefProcTaskExecutor;
public:
// ------------------------ Don't putback if not needed
// Actions that the compaction manager should take.
enum Action {
Update,
Copy,
UpdateAndCopy,
CopyAndUpdate,
VerifyUpdate,
ResetObjects,
NotValid
};
// ------------------------ End don't putback if not needed
private:
// 32-bit: 4K * 8 = 32KiB; 64-bit: 8K * 16 = 128KiB
#define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13))
typedef OverflowTaskQueue<ObjArrayTask, QUEUE_SIZE> ObjArrayTaskQueue;
typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet;
#undef QUEUE_SIZE
static ParCompactionManager** _manager_array;
static OopTaskQueueSet* _stack_array;
static ObjArrayTaskQueueSet* _objarray_queues;
static ObjectStartArray* _start_array;
static RegionTaskQueueSet* _region_array;
static PSOldGen* _old_gen;
private:
OverflowTaskQueue<oop> _marking_stack;
ObjArrayTaskQueue _objarray_stack;
// Is there a way to reuse the _marking_stack for the
// saving empty regions? For now just create a different
// type of TaskQueue.
RegionTaskQueue _region_stack;
#if 1 // does this happen enough to need a per thread stack?
GrowableArray<Klass*>* _revisit_klass_stack;
GrowableArray<DataLayout*>* _revisit_mdo_stack;
#endif
static ParMarkBitMap* _mark_bitmap;
Action _action;
static PSOldGen* old_gen() { return _old_gen; }
static ObjectStartArray* start_array() { return _start_array; }
static OopTaskQueueSet* stack_array() { return _stack_array; }
static void initialize(ParMarkBitMap* mbm);
protected:
// Array of tasks. Needed by the ParallelTaskTerminator.
static RegionTaskQueueSet* region_array() { return _region_array; }
OverflowTaskQueue<oop>* marking_stack() { return &_marking_stack; }
RegionTaskQueue* region_stack() { return &_region_stack; }
// Pushes onto the marking stack. If the marking stack is full,
// pushes onto the overflow stack.
void stack_push(oop obj);
// Do not implement an equivalent stack_pop. Deal with the
// marking stack and overflow stack directly.
public:
Action action() { return _action; }
void set_action(Action v) { _action = v; }
inline static ParCompactionManager* manager_array(int index);
ParCompactionManager();
~ParCompactionManager();
void allocate_stacks();
void deallocate_stacks();
ParMarkBitMap* mark_bitmap() { return _mark_bitmap; }
// Take actions in preparation for a compaction.
static void reset();
// void drain_stacks();
bool should_update();
bool should_copy();
bool should_verify_only();
bool should_reset_only();
#if 1
// Probably stays as a growable array
GrowableArray<Klass*>* revisit_klass_stack() { return _revisit_klass_stack; }
GrowableArray<DataLayout*>* revisit_mdo_stack() { return _revisit_mdo_stack; }
#endif
// Save for later processing. Must not fail.
inline void push(oop obj) { _marking_stack.push(obj); }
inline void push_objarray(oop objarray, size_t index);
inline void push_region(size_t index);
// Access function for compaction managers
static ParCompactionManager* gc_thread_compaction_manager(int index);
static bool steal(int queue_num, int* seed, oop& t) {
return stack_array()->steal(queue_num, seed, t);
}
static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) {
return _objarray_queues->steal(queue_num, seed, t);
}
static bool steal(int queue_num, int* seed, size_t& region) {
return region_array()->steal(queue_num, seed, region);
}
// Process tasks remaining on any marking stack
void follow_marking_stacks();
inline bool marking_stacks_empty() const;
// Process tasks remaining on any stack
void drain_region_stacks();
// Debugging support
#ifdef ASSERT
bool stacks_have_been_allocated();
#endif
};
inline ParCompactionManager* ParCompactionManager::manager_array(int index) {
assert(_manager_array != NULL, "access of NULL manager_array");
assert(index >= 0 && index <= (int)ParallelGCThreads,
"out of range manager_array access");
return _manager_array[index];
}
bool ParCompactionManager::marking_stacks_empty() const {
return _marking_stack.is_empty() && _objarray_stack.is_empty();
}
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