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/*
* Copyright 2005-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
//
// psPromotionManager is used by a single thread to manage object survival
// during a scavenge. The promotion manager contains thread local data only.
//
// NOTE! Be carefull when allocating the stacks on cheap. If you are going
// to use a promotion manager in more than one thread, the stacks MUST be
// on cheap. This can lead to memory leaks, though, as they are not auto
// deallocated.
//
// FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate!
//
// 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;
// Move to it's own file if this works out.
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:
static ParCompactionManager** _manager_array;
static OopTaskQueueSet* _stack_array;
static ObjectStartArray* _start_array;
static RegionTaskQueueSet* _region_array;
static PSOldGen* _old_gen;
OopTaskQueue _marking_stack;
GrowableArray<oop>* _overflow_stack;
// Is there a way to reuse the _marking_stack for the
// saving empty regions? For now just create a different
// type of TaskQueue.
#ifdef USE_RegionTaskQueueWithOverflow
RegionTaskQueueWithOverflow _region_stack;
#else
RegionTaskQueue _region_stack;
GrowableArray<size_t>* _region_overflow_stack;
#endif
#if 1 // does this happen enough to need a per thread stack?
GrowableArray<Klass*>* _revisit_klass_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; }
OopTaskQueue* marking_stack() { return &_marking_stack; }
GrowableArray<oop>* overflow_stack() { return _overflow_stack; }
#ifdef USE_RegionTaskQueueWithOverflow
RegionTaskQueueWithOverflow* region_stack() { return &_region_stack; }
#else
RegionTaskQueue* region_stack() { return &_region_stack; }
GrowableArray<size_t>* region_overflow_stack() {
return _region_overflow_stack;
}
#endif
// 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.
// Pushes onto the region stack. If the region stack is full,
// pushes onto the region overflow stack.
void region_stack_push(size_t region_index);
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; }
#endif
// Save oop for later processing. Must not fail.
void save_for_scanning(oop m);
// Get a oop for scanning. If returns null, no oop were found.
oop retrieve_for_scanning();
// Save region for later processing. Must not fail.
void save_for_processing(size_t region_index);
// Get a region for processing. If returns null, no region were found.
bool retrieve_for_processing(size_t& region_index);
// Access function for compaction managers
static ParCompactionManager* gc_thread_compaction_manager(int index);
static bool steal(int queue_num, int* seed, Task& t) {
return stack_array()->steal(queue_num, seed, t);
}
static bool steal(int queue_num, int* seed, RegionTask& t) {
return region_array()->steal(queue_num, seed, t);
}
// Process tasks remaining on any stack
void drain_marking_stacks(OopClosure *blk);
// Process tasks remaining on any stack
void drain_region_stacks();
// Process tasks remaining on any stack
void drain_region_overflow_stack();
// 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];
}
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