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/*
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* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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#ifndef SERIALGC
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// A HeapRegion is the smallest piece of a G1CollectedHeap that
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// can be collected independently.
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// NOTE: Although a HeapRegion is a Space, its
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// Space::initDirtyCardClosure method must not be called.
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// The problem is that the existence of this method breaks
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// the independence of barrier sets from remembered sets.
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// The solution is to remove this method from the definition
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// of a Space.
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class CompactibleSpace;
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class ContiguousSpace;
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class HeapRegionRemSet;
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class HeapRegionRemSetIterator;
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class HeapRegion;
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// A dirty card to oop closure for heap regions. It
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// knows how to get the G1 heap and how to use the bitmap
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// in the concurrent marker used by G1 to filter remembered
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// sets.
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class HeapRegionDCTOC : public ContiguousSpaceDCTOC {
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public:
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// Specification of possible DirtyCardToOopClosure filtering.
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enum FilterKind {
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NoFilterKind,
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IntoCSFilterKind,
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OutOfRegionFilterKind
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};
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protected:
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HeapRegion* _hr;
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FilterKind _fk;
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G1CollectedHeap* _g1;
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void walk_mem_region_with_cl(MemRegion mr,
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HeapWord* bottom, HeapWord* top,
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OopClosure* cl);
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// We don't specialize this for FilteringClosure; filtering is handled by
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// the "FilterKind" mechanism. But we provide this to avoid a compiler
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// warning.
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void walk_mem_region_with_cl(MemRegion mr,
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HeapWord* bottom, HeapWord* top,
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FilteringClosure* cl) {
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HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top,
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(OopClosure*)cl);
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}
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// Get the actual top of the area on which the closure will
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// operate, given where the top is assumed to be (the end of the
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// memory region passed to do_MemRegion) and where the object
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// at the top is assumed to start. For example, an object may
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// start at the top but actually extend past the assumed top,
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// in which case the top becomes the end of the object.
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HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) {
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return ContiguousSpaceDCTOC::get_actual_top(top, top_obj);
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}
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// Walk the given memory region from bottom to (actual) top
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// looking for objects and applying the oop closure (_cl) to
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// them. The base implementation of this treats the area as
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// blocks, where a block may or may not be an object. Sub-
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// classes should override this to provide more accurate
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// or possibly more efficient walking.
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void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) {
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Filtering_DCTOC::walk_mem_region(mr, bottom, top);
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}
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public:
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HeapRegionDCTOC(G1CollectedHeap* g1,
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HeapRegion* hr, OopClosure* cl,
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CardTableModRefBS::PrecisionStyle precision,
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FilterKind fk);
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};
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// The complicating factor is that BlockOffsetTable diverged
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// significantly, and we need functionality that is only in the G1 version.
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// So I copied that code, which led to an alternate G1 version of
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// OffsetTableContigSpace. If the two versions of BlockOffsetTable could
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// be reconciled, then G1OffsetTableContigSpace could go away.
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// The idea behind time stamps is the following. Doing a save_marks on
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// all regions at every GC pause is time consuming (if I remember
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// well, 10ms or so). So, we would like to do that only for regions
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// that are GC alloc regions. To achieve this, we use time
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// stamps. For every evacuation pause, G1CollectedHeap generates a
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// unique time stamp (essentially a counter that gets
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// incremented). Every time we want to call save_marks on a region,
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// we set the saved_mark_word to top and also copy the current GC
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// time stamp to the time stamp field of the space. Reading the
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// saved_mark_word involves checking the time stamp of the
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// region. If it is the same as the current GC time stamp, then we
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// can safely read the saved_mark_word field, as it is valid. If the
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// time stamp of the region is not the same as the current GC time
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// stamp, then we instead read top, as the saved_mark_word field is
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// invalid. Time stamps (on the regions and also on the
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// G1CollectedHeap) are reset at every cleanup (we iterate over
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// the regions anyway) and at the end of a Full GC. The current scheme
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// that uses sequential unsigned ints will fail only if we have 4b
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// evacuation pauses between two cleanups, which is _highly_ unlikely.
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class G1OffsetTableContigSpace: public ContiguousSpace {
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friend class VMStructs;
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protected:
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G1BlockOffsetArrayContigSpace _offsets;
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Mutex _par_alloc_lock;
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volatile unsigned _gc_time_stamp;
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public:
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// Constructor. If "is_zeroed" is true, the MemRegion "mr" may be
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// assumed to contain zeros.
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G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray,
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MemRegion mr, bool is_zeroed = false);
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void set_bottom(HeapWord* value);
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void set_end(HeapWord* value);
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virtual HeapWord* saved_mark_word() const;
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virtual void set_saved_mark();
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void reset_gc_time_stamp() { _gc_time_stamp = 0; }
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virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space);
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virtual void clear(bool mangle_space);
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HeapWord* block_start(const void* p);
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HeapWord* block_start_const(const void* p) const;
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// Add offset table update.
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virtual HeapWord* allocate(size_t word_size);
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HeapWord* par_allocate(size_t word_size);
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// MarkSweep support phase3
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virtual HeapWord* initialize_threshold();
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virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end);
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virtual void print() const;
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};
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class HeapRegion: public G1OffsetTableContigSpace {
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friend class VMStructs;
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private:
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enum HumongousType {
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NotHumongous = 0,
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StartsHumongous,
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ContinuesHumongous
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};
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// The next filter kind that should be used for a "new_dcto_cl" call with
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// the "traditional" signature.
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HeapRegionDCTOC::FilterKind _next_fk;
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// Requires that the region "mr" be dense with objects, and begin and end
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// with an object.
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void oops_in_mr_iterate(MemRegion mr, OopClosure* cl);
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// The remembered set for this region.
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// (Might want to make this "inline" later, to avoid some alloc failure
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// issues.)
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HeapRegionRemSet* _rem_set;
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G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; }
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protected:
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// If this region is a member of a HeapRegionSeq, the index in that
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// sequence, otherwise -1.
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int _hrs_index;
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HumongousType _humongous_type;
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// For a humongous region, region in which it starts.
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HeapRegion* _humongous_start_region;
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// For the start region of a humongous sequence, it's original end().
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HeapWord* _orig_end;
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// True iff the region is in current collection_set.
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bool _in_collection_set;
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// True iff the region is on the unclean list, waiting to be zero filled.
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bool _is_on_unclean_list;
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// True iff the region is on the free list, ready for allocation.
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bool _is_on_free_list;
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// Is this or has it been an allocation region in the current collection
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// pause.
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bool _is_gc_alloc_region;
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// True iff an attempt to evacuate an object in the region failed.
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bool _evacuation_failed;
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// A heap region may be a member one of a number of special subsets, each
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// represented as linked lists through the field below. Currently, these
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// sets include:
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// The collection set.
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// The set of allocation regions used in a collection pause.
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// Spaces that may contain gray objects.
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HeapRegion* _next_in_special_set;
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// next region in the young "generation" region set
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HeapRegion* _next_young_region;
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// For parallel heapRegion traversal.
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jint _claimed;
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// We use concurrent marking to determine the amount of live data
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// in each heap region.
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size_t _prev_marked_bytes; // Bytes known to be live via last completed marking.
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size_t _next_marked_bytes; // Bytes known to be live via in-progress marking.
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// See "sort_index" method. -1 means is not in the array.
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int _sort_index;
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// Means it has (or at least had) a very large RS, and should not be
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// considered for membership in a collection set.
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enum PopularityState {
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NotPopular,
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PopularPending,
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Popular
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};
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PopularityState _popularity;
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// <PREDICTION>
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double _gc_efficiency;
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// </PREDICTION>
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enum YoungType {
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NotYoung, // a region is not young
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ScanOnly, // a region is young and scan-only
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Young, // a region is young
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Survivor // a region is young and it contains
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// survivor
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};
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YoungType _young_type;
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int _young_index_in_cset;
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SurvRateGroup* _surv_rate_group;
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int _age_index;
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// The start of the unmarked area. The unmarked area extends from this
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// word until the top and/or end of the region, and is the part
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// of the region for which no marking was done, i.e. objects may
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// have been allocated in this part since the last mark phase.
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// "prev" is the top at the start of the last completed marking.
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// "next" is the top at the start of the in-progress marking (if any.)
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HeapWord* _prev_top_at_mark_start;
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HeapWord* _next_top_at_mark_start;
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// If a collection pause is in progress, this is the top at the start
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// of that pause.
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// We've counted the marked bytes of objects below here.
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HeapWord* _top_at_conc_mark_count;
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void init_top_at_mark_start() {
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assert(_prev_marked_bytes == 0 &&
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_next_marked_bytes == 0,
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"Must be called after zero_marked_bytes.");
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HeapWord* bot = bottom();
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_prev_top_at_mark_start = bot;
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_next_top_at_mark_start = bot;
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_top_at_conc_mark_count = bot;
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}
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jint _zfs; // A member of ZeroFillState. Protected by ZF_lock.
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Thread* _zero_filler; // If _zfs is ZeroFilling, the thread that (last)
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// made it so.
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void set_young_type(YoungType new_type) {
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//assert(_young_type != new_type, "setting the same type" );
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// TODO: add more assertions here
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_young_type = new_type;
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}
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public:
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// If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros.
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HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray,
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MemRegion mr, bool is_zeroed);
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enum SomePublicConstants {
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// HeapRegions are GrainBytes-aligned
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// and have sizes that are multiples of GrainBytes.
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LogOfHRGrainBytes = 20,
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LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize,
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GrainBytes = 1 << LogOfHRGrainBytes,
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GrainWords = 1 <<LogOfHRGrainWords,
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MaxAge = 2, NoOfAges = MaxAge+1
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};
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enum ClaimValues {
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InitialClaimValue = 0,
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FinalCountClaimValue = 1,
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NoteEndClaimValue = 2,
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ScrubRemSetClaimValue = 3,
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ParVerifyClaimValue = 4
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};
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// Concurrent refinement requires contiguous heap regions (in which TLABs
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// might be allocated) to be zero-filled. Each region therefore has a
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// zero-fill-state.
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enum ZeroFillState {
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NotZeroFilled,
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ZeroFilling,
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ZeroFilled,
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Allocated
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};
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// If this region is a member of a HeapRegionSeq, the index in that
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// sequence, otherwise -1.
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int hrs_index() const { return _hrs_index; }
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void set_hrs_index(int index) { _hrs_index = index; }
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// The number of bytes marked live in the region in the last marking phase.
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size_t marked_bytes() { return _prev_marked_bytes; }
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// The number of bytes counted in the next marking.
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size_t next_marked_bytes() { return _next_marked_bytes; }
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// The number of bytes live wrt the next marking.
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size_t next_live_bytes() {
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return (top() - next_top_at_mark_start())
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* HeapWordSize
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+ next_marked_bytes();
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}
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// A lower bound on the amount of garbage bytes in the region.
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size_t garbage_bytes() {
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size_t used_at_mark_start_bytes =
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(prev_top_at_mark_start() - bottom()) * HeapWordSize;
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assert(used_at_mark_start_bytes >= marked_bytes(),
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"Can't mark more than we have.");
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return used_at_mark_start_bytes - marked_bytes();
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}
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// An upper bound on the number of live bytes in the region.
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size_t max_live_bytes() { return used() - garbage_bytes(); }
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void add_to_marked_bytes(size_t incr_bytes) {
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_next_marked_bytes = _next_marked_bytes + incr_bytes;
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guarantee( _next_marked_bytes <= used(), "invariant" );
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}
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void zero_marked_bytes() {
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_prev_marked_bytes = _next_marked_bytes = 0;
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}
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bool isHumongous() const { return _humongous_type != NotHumongous; }
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bool startsHumongous() const { return _humongous_type == StartsHumongous; }
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bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; }
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// For a humongous region, region in which it starts.
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HeapRegion* humongous_start_region() const {
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return _humongous_start_region;
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}
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// Causes the current region to represent a humongous object spanning "n"
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// regions.
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virtual void set_startsHumongous();
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// The regions that continue a humongous sequence should be added using
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// this method, in increasing address order.
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void set_continuesHumongous(HeapRegion* start);
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void add_continuingHumongousRegion(HeapRegion* cont);
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// If the region has a remembered set, return a pointer to it.
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|
390 |
HeapRegionRemSet* rem_set() const {
|
|
391 |
return _rem_set;
|
|
392 |
}
|
|
393 |
|
|
394 |
// True iff the region is in current collection_set.
|
|
395 |
bool in_collection_set() const {
|
|
396 |
return _in_collection_set;
|
|
397 |
}
|
|
398 |
void set_in_collection_set(bool b) {
|
|
399 |
_in_collection_set = b;
|
|
400 |
}
|
|
401 |
HeapRegion* next_in_collection_set() {
|
|
402 |
assert(in_collection_set(), "should only invoke on member of CS.");
|
|
403 |
assert(_next_in_special_set == NULL ||
|
|
404 |
_next_in_special_set->in_collection_set(),
|
|
405 |
"Malformed CS.");
|
|
406 |
return _next_in_special_set;
|
|
407 |
}
|
|
408 |
void set_next_in_collection_set(HeapRegion* r) {
|
|
409 |
assert(in_collection_set(), "should only invoke on member of CS.");
|
|
410 |
assert(r == NULL || r->in_collection_set(), "Malformed CS.");
|
|
411 |
_next_in_special_set = r;
|
|
412 |
}
|
|
413 |
|
|
414 |
// True iff it is or has been an allocation region in the current
|
|
415 |
// collection pause.
|
|
416 |
bool is_gc_alloc_region() const {
|
|
417 |
return _is_gc_alloc_region;
|
|
418 |
}
|
|
419 |
void set_is_gc_alloc_region(bool b) {
|
|
420 |
_is_gc_alloc_region = b;
|
|
421 |
}
|
|
422 |
HeapRegion* next_gc_alloc_region() {
|
|
423 |
assert(is_gc_alloc_region(), "should only invoke on member of CS.");
|
|
424 |
assert(_next_in_special_set == NULL ||
|
|
425 |
_next_in_special_set->is_gc_alloc_region(),
|
|
426 |
"Malformed CS.");
|
|
427 |
return _next_in_special_set;
|
|
428 |
}
|
|
429 |
void set_next_gc_alloc_region(HeapRegion* r) {
|
|
430 |
assert(is_gc_alloc_region(), "should only invoke on member of CS.");
|
|
431 |
assert(r == NULL || r->is_gc_alloc_region(), "Malformed CS.");
|
|
432 |
_next_in_special_set = r;
|
|
433 |
}
|
|
434 |
|
|
435 |
bool is_reserved() {
|
|
436 |
return popular();
|
|
437 |
}
|
|
438 |
|
|
439 |
bool is_on_free_list() {
|
|
440 |
return _is_on_free_list;
|
|
441 |
}
|
|
442 |
|
|
443 |
void set_on_free_list(bool b) {
|
|
444 |
_is_on_free_list = b;
|
|
445 |
}
|
|
446 |
|
|
447 |
HeapRegion* next_from_free_list() {
|
|
448 |
assert(is_on_free_list(),
|
|
449 |
"Should only invoke on free space.");
|
|
450 |
assert(_next_in_special_set == NULL ||
|
|
451 |
_next_in_special_set->is_on_free_list(),
|
|
452 |
"Malformed Free List.");
|
|
453 |
return _next_in_special_set;
|
|
454 |
}
|
|
455 |
|
|
456 |
void set_next_on_free_list(HeapRegion* r) {
|
|
457 |
assert(r == NULL || r->is_on_free_list(), "Malformed free list.");
|
|
458 |
_next_in_special_set = r;
|
|
459 |
}
|
|
460 |
|
|
461 |
bool is_on_unclean_list() {
|
|
462 |
return _is_on_unclean_list;
|
|
463 |
}
|
|
464 |
|
|
465 |
void set_on_unclean_list(bool b);
|
|
466 |
|
|
467 |
HeapRegion* next_from_unclean_list() {
|
|
468 |
assert(is_on_unclean_list(),
|
|
469 |
"Should only invoke on unclean space.");
|
|
470 |
assert(_next_in_special_set == NULL ||
|
|
471 |
_next_in_special_set->is_on_unclean_list(),
|
|
472 |
"Malformed unclean List.");
|
|
473 |
return _next_in_special_set;
|
|
474 |
}
|
|
475 |
|
|
476 |
void set_next_on_unclean_list(HeapRegion* r);
|
|
477 |
|
|
478 |
HeapRegion* get_next_young_region() { return _next_young_region; }
|
|
479 |
void set_next_young_region(HeapRegion* hr) {
|
|
480 |
_next_young_region = hr;
|
|
481 |
}
|
|
482 |
|
|
483 |
// Allows logical separation between objects allocated before and after.
|
|
484 |
void save_marks();
|
|
485 |
|
|
486 |
// Reset HR stuff to default values.
|
|
487 |
void hr_clear(bool par, bool clear_space);
|
|
488 |
|
1388
|
489 |
void initialize(MemRegion mr, bool clear_space, bool mangle_space);
|
1374
|
490 |
|
|
491 |
// Ensure that "this" is zero-filled.
|
|
492 |
void ensure_zero_filled();
|
|
493 |
// This one requires that the calling thread holds ZF_mon.
|
|
494 |
void ensure_zero_filled_locked();
|
|
495 |
|
|
496 |
// Get the start of the unmarked area in this region.
|
|
497 |
HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; }
|
|
498 |
HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; }
|
|
499 |
|
|
500 |
// Apply "cl->do_oop" to (the addresses of) all reference fields in objects
|
|
501 |
// allocated in the current region before the last call to "save_mark".
|
|
502 |
void oop_before_save_marks_iterate(OopClosure* cl);
|
|
503 |
|
|
504 |
// This call determines the "filter kind" argument that will be used for
|
|
505 |
// the next call to "new_dcto_cl" on this region with the "traditional"
|
|
506 |
// signature (i.e., the call below.) The default, in the absence of a
|
|
507 |
// preceding call to this method, is "NoFilterKind", and a call to this
|
|
508 |
// method is necessary for each such call, or else it reverts to the
|
|
509 |
// default.
|
|
510 |
// (This is really ugly, but all other methods I could think of changed a
|
|
511 |
// lot of main-line code for G1.)
|
|
512 |
void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) {
|
|
513 |
_next_fk = nfk;
|
|
514 |
}
|
|
515 |
|
|
516 |
DirtyCardToOopClosure*
|
|
517 |
new_dcto_closure(OopClosure* cl,
|
|
518 |
CardTableModRefBS::PrecisionStyle precision,
|
|
519 |
HeapRegionDCTOC::FilterKind fk);
|
|
520 |
|
|
521 |
#if WHASSUP
|
|
522 |
DirtyCardToOopClosure*
|
|
523 |
new_dcto_closure(OopClosure* cl,
|
|
524 |
CardTableModRefBS::PrecisionStyle precision,
|
|
525 |
HeapWord* boundary) {
|
|
526 |
assert(boundary == NULL, "This arg doesn't make sense here.");
|
|
527 |
DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk);
|
|
528 |
_next_fk = HeapRegionDCTOC::NoFilterKind;
|
|
529 |
return res;
|
|
530 |
}
|
|
531 |
#endif
|
|
532 |
|
|
533 |
//
|
|
534 |
// Note the start or end of marking. This tells the heap region
|
|
535 |
// that the collector is about to start or has finished (concurrently)
|
|
536 |
// marking the heap.
|
|
537 |
//
|
|
538 |
|
|
539 |
// Note the start of a marking phase. Record the
|
|
540 |
// start of the unmarked area of the region here.
|
|
541 |
void note_start_of_marking(bool during_initial_mark) {
|
|
542 |
init_top_at_conc_mark_count();
|
|
543 |
_next_marked_bytes = 0;
|
|
544 |
if (during_initial_mark && is_young() && !is_survivor())
|
|
545 |
_next_top_at_mark_start = bottom();
|
|
546 |
else
|
|
547 |
_next_top_at_mark_start = top();
|
|
548 |
}
|
|
549 |
|
|
550 |
// Note the end of a marking phase. Install the start of
|
|
551 |
// the unmarked area that was captured at start of marking.
|
|
552 |
void note_end_of_marking() {
|
|
553 |
_prev_top_at_mark_start = _next_top_at_mark_start;
|
|
554 |
_prev_marked_bytes = _next_marked_bytes;
|
|
555 |
_next_marked_bytes = 0;
|
|
556 |
|
|
557 |
guarantee(_prev_marked_bytes <=
|
|
558 |
(size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize,
|
|
559 |
"invariant");
|
|
560 |
}
|
|
561 |
|
|
562 |
// After an evacuation, we need to update _next_top_at_mark_start
|
|
563 |
// to be the current top. Note this is only valid if we have only
|
|
564 |
// ever evacuated into this region. If we evacuate, allocate, and
|
|
565 |
// then evacuate we are in deep doodoo.
|
|
566 |
void note_end_of_copying() {
|
|
567 |
assert(top() >= _next_top_at_mark_start,
|
|
568 |
"Increase only");
|
|
569 |
_next_top_at_mark_start = top();
|
|
570 |
}
|
|
571 |
|
|
572 |
// Returns "false" iff no object in the region was allocated when the
|
|
573 |
// last mark phase ended.
|
|
574 |
bool is_marked() { return _prev_top_at_mark_start != bottom(); }
|
|
575 |
|
|
576 |
// If "is_marked()" is true, then this is the index of the region in
|
|
577 |
// an array constructed at the end of marking of the regions in a
|
|
578 |
// "desirability" order.
|
|
579 |
int sort_index() {
|
|
580 |
return _sort_index;
|
|
581 |
}
|
|
582 |
void set_sort_index(int i) {
|
|
583 |
_sort_index = i;
|
|
584 |
}
|
|
585 |
|
|
586 |
void init_top_at_conc_mark_count() {
|
|
587 |
_top_at_conc_mark_count = bottom();
|
|
588 |
}
|
|
589 |
|
|
590 |
void set_top_at_conc_mark_count(HeapWord *cur) {
|
|
591 |
assert(bottom() <= cur && cur <= end(), "Sanity.");
|
|
592 |
_top_at_conc_mark_count = cur;
|
|
593 |
}
|
|
594 |
|
|
595 |
HeapWord* top_at_conc_mark_count() {
|
|
596 |
return _top_at_conc_mark_count;
|
|
597 |
}
|
|
598 |
|
|
599 |
void reset_during_compaction() {
|
|
600 |
guarantee( isHumongous() && startsHumongous(),
|
|
601 |
"should only be called for humongous regions");
|
|
602 |
|
|
603 |
zero_marked_bytes();
|
|
604 |
init_top_at_mark_start();
|
|
605 |
}
|
|
606 |
|
|
607 |
bool popular() { return _popularity == Popular; }
|
|
608 |
void set_popular(bool b) {
|
|
609 |
if (b) {
|
|
610 |
_popularity = Popular;
|
|
611 |
} else {
|
|
612 |
_popularity = NotPopular;
|
|
613 |
}
|
|
614 |
}
|
|
615 |
bool popular_pending() { return _popularity == PopularPending; }
|
|
616 |
void set_popular_pending(bool b) {
|
|
617 |
if (b) {
|
|
618 |
_popularity = PopularPending;
|
|
619 |
} else {
|
|
620 |
_popularity = NotPopular;
|
|
621 |
}
|
|
622 |
}
|
|
623 |
|
|
624 |
// <PREDICTION>
|
|
625 |
void calc_gc_efficiency(void);
|
|
626 |
double gc_efficiency() { return _gc_efficiency;}
|
|
627 |
// </PREDICTION>
|
|
628 |
|
|
629 |
bool is_young() const { return _young_type != NotYoung; }
|
|
630 |
bool is_scan_only() const { return _young_type == ScanOnly; }
|
|
631 |
bool is_survivor() const { return _young_type == Survivor; }
|
|
632 |
|
|
633 |
int young_index_in_cset() const { return _young_index_in_cset; }
|
|
634 |
void set_young_index_in_cset(int index) {
|
|
635 |
assert( (index == -1) || is_young(), "pre-condition" );
|
|
636 |
_young_index_in_cset = index;
|
|
637 |
}
|
|
638 |
|
|
639 |
int age_in_surv_rate_group() {
|
|
640 |
assert( _surv_rate_group != NULL, "pre-condition" );
|
|
641 |
assert( _age_index > -1, "pre-condition" );
|
|
642 |
return _surv_rate_group->age_in_group(_age_index);
|
|
643 |
}
|
|
644 |
|
|
645 |
void recalculate_age_in_surv_rate_group() {
|
|
646 |
assert( _surv_rate_group != NULL, "pre-condition" );
|
|
647 |
assert( _age_index > -1, "pre-condition" );
|
|
648 |
_age_index = _surv_rate_group->recalculate_age_index(_age_index);
|
|
649 |
}
|
|
650 |
|
|
651 |
void record_surv_words_in_group(size_t words_survived) {
|
|
652 |
assert( _surv_rate_group != NULL, "pre-condition" );
|
|
653 |
assert( _age_index > -1, "pre-condition" );
|
|
654 |
int age_in_group = age_in_surv_rate_group();
|
|
655 |
_surv_rate_group->record_surviving_words(age_in_group, words_survived);
|
|
656 |
}
|
|
657 |
|
|
658 |
int age_in_surv_rate_group_cond() {
|
|
659 |
if (_surv_rate_group != NULL)
|
|
660 |
return age_in_surv_rate_group();
|
|
661 |
else
|
|
662 |
return -1;
|
|
663 |
}
|
|
664 |
|
|
665 |
SurvRateGroup* surv_rate_group() {
|
|
666 |
return _surv_rate_group;
|
|
667 |
}
|
|
668 |
|
|
669 |
void install_surv_rate_group(SurvRateGroup* surv_rate_group) {
|
|
670 |
assert( surv_rate_group != NULL, "pre-condition" );
|
|
671 |
assert( _surv_rate_group == NULL, "pre-condition" );
|
|
672 |
assert( is_young(), "pre-condition" );
|
|
673 |
|
|
674 |
_surv_rate_group = surv_rate_group;
|
|
675 |
_age_index = surv_rate_group->next_age_index();
|
|
676 |
}
|
|
677 |
|
|
678 |
void uninstall_surv_rate_group() {
|
|
679 |
if (_surv_rate_group != NULL) {
|
|
680 |
assert( _age_index > -1, "pre-condition" );
|
|
681 |
assert( is_young(), "pre-condition" );
|
|
682 |
|
|
683 |
_surv_rate_group = NULL;
|
|
684 |
_age_index = -1;
|
|
685 |
} else {
|
|
686 |
assert( _age_index == -1, "pre-condition" );
|
|
687 |
}
|
|
688 |
}
|
|
689 |
|
|
690 |
void set_young() { set_young_type(Young); }
|
|
691 |
|
|
692 |
void set_scan_only() { set_young_type(ScanOnly); }
|
|
693 |
|
|
694 |
void set_survivor() { set_young_type(Survivor); }
|
|
695 |
|
|
696 |
void set_not_young() { set_young_type(NotYoung); }
|
|
697 |
|
|
698 |
// Determine if an object has been allocated since the last
|
|
699 |
// mark performed by the collector. This returns true iff the object
|
|
700 |
// is within the unmarked area of the region.
|
|
701 |
bool obj_allocated_since_prev_marking(oop obj) const {
|
|
702 |
return (HeapWord *) obj >= prev_top_at_mark_start();
|
|
703 |
}
|
|
704 |
bool obj_allocated_since_next_marking(oop obj) const {
|
|
705 |
return (HeapWord *) obj >= next_top_at_mark_start();
|
|
706 |
}
|
|
707 |
|
|
708 |
// For parallel heapRegion traversal.
|
|
709 |
bool claimHeapRegion(int claimValue);
|
|
710 |
jint claim_value() { return _claimed; }
|
|
711 |
// Use this carefully: only when you're sure no one is claiming...
|
|
712 |
void set_claim_value(int claimValue) { _claimed = claimValue; }
|
|
713 |
|
|
714 |
// Returns the "evacuation_failed" property of the region.
|
|
715 |
bool evacuation_failed() { return _evacuation_failed; }
|
|
716 |
|
|
717 |
// Sets the "evacuation_failed" property of the region.
|
|
718 |
void set_evacuation_failed(bool b) {
|
|
719 |
_evacuation_failed = b;
|
|
720 |
|
|
721 |
if (b) {
|
|
722 |
init_top_at_conc_mark_count();
|
|
723 |
_next_marked_bytes = 0;
|
|
724 |
}
|
|
725 |
}
|
|
726 |
|
|
727 |
// Requires that "mr" be entirely within the region.
|
|
728 |
// Apply "cl->do_object" to all objects that intersect with "mr".
|
|
729 |
// If the iteration encounters an unparseable portion of the region,
|
|
730 |
// or if "cl->abort()" is true after a closure application,
|
|
731 |
// terminate the iteration and return the address of the start of the
|
|
732 |
// subregion that isn't done. (The two can be distinguished by querying
|
|
733 |
// "cl->abort()".) Return of "NULL" indicates that the iteration
|
|
734 |
// completed.
|
|
735 |
HeapWord*
|
|
736 |
object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl);
|
|
737 |
|
|
738 |
HeapWord*
|
|
739 |
oops_on_card_seq_iterate_careful(MemRegion mr,
|
|
740 |
FilterOutOfRegionClosure* cl);
|
|
741 |
|
|
742 |
// The region "mr" is entirely in "this", and starts and ends at block
|
|
743 |
// boundaries. The caller declares that all the contained blocks are
|
|
744 |
// coalesced into one.
|
|
745 |
void declare_filled_region_to_BOT(MemRegion mr) {
|
|
746 |
_offsets.single_block(mr.start(), mr.end());
|
|
747 |
}
|
|
748 |
|
|
749 |
// A version of block start that is guaranteed to find *some* block
|
|
750 |
// boundary at or before "p", but does not object iteration, and may
|
|
751 |
// therefore be used safely when the heap is unparseable.
|
|
752 |
HeapWord* block_start_careful(const void* p) const {
|
|
753 |
return _offsets.block_start_careful(p);
|
|
754 |
}
|
|
755 |
|
|
756 |
// Requires that "addr" is within the region. Returns the start of the
|
|
757 |
// first ("careful") block that starts at or after "addr", or else the
|
|
758 |
// "end" of the region if there is no such block.
|
|
759 |
HeapWord* next_block_start_careful(HeapWord* addr);
|
|
760 |
|
|
761 |
// Returns the zero-fill-state of the current region.
|
|
762 |
ZeroFillState zero_fill_state() { return (ZeroFillState)_zfs; }
|
|
763 |
bool zero_fill_is_allocated() { return _zfs == Allocated; }
|
|
764 |
Thread* zero_filler() { return _zero_filler; }
|
|
765 |
|
|
766 |
// Indicate that the contents of the region are unknown, and therefore
|
|
767 |
// might require zero-filling.
|
|
768 |
void set_zero_fill_needed() {
|
|
769 |
set_zero_fill_state_work(NotZeroFilled);
|
|
770 |
}
|
|
771 |
void set_zero_fill_in_progress(Thread* t) {
|
|
772 |
set_zero_fill_state_work(ZeroFilling);
|
|
773 |
_zero_filler = t;
|
|
774 |
}
|
|
775 |
void set_zero_fill_complete();
|
|
776 |
void set_zero_fill_allocated() {
|
|
777 |
set_zero_fill_state_work(Allocated);
|
|
778 |
}
|
|
779 |
|
|
780 |
void set_zero_fill_state_work(ZeroFillState zfs);
|
|
781 |
|
|
782 |
// This is called when a full collection shrinks the heap.
|
|
783 |
// We want to set the heap region to a value which says
|
|
784 |
// it is no longer part of the heap. For now, we'll let "NotZF" fill
|
|
785 |
// that role.
|
|
786 |
void reset_zero_fill() {
|
|
787 |
set_zero_fill_state_work(NotZeroFilled);
|
|
788 |
_zero_filler = NULL;
|
|
789 |
}
|
|
790 |
|
|
791 |
#define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \
|
|
792 |
virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl);
|
|
793 |
SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL)
|
|
794 |
|
|
795 |
CompactibleSpace* next_compaction_space() const;
|
|
796 |
|
|
797 |
virtual void reset_after_compaction();
|
|
798 |
|
|
799 |
void print() const;
|
|
800 |
void print_on(outputStream* st) const;
|
|
801 |
|
|
802 |
// Override
|
|
803 |
virtual void verify(bool allow_dirty) const;
|
|
804 |
|
|
805 |
#ifdef DEBUG
|
|
806 |
HeapWord* allocate(size_t size);
|
|
807 |
#endif
|
|
808 |
};
|
|
809 |
|
|
810 |
// HeapRegionClosure is used for iterating over regions.
|
|
811 |
// Terminates the iteration when the "doHeapRegion" method returns "true".
|
|
812 |
class HeapRegionClosure : public StackObj {
|
|
813 |
friend class HeapRegionSeq;
|
|
814 |
friend class G1CollectedHeap;
|
|
815 |
|
|
816 |
bool _complete;
|
|
817 |
void incomplete() { _complete = false; }
|
|
818 |
|
|
819 |
public:
|
|
820 |
HeapRegionClosure(): _complete(true) {}
|
|
821 |
|
|
822 |
// Typically called on each region until it returns true.
|
|
823 |
virtual bool doHeapRegion(HeapRegion* r) = 0;
|
|
824 |
|
|
825 |
// True after iteration if the closure was applied to all heap regions
|
|
826 |
// and returned "false" in all cases.
|
|
827 |
bool complete() { return _complete; }
|
|
828 |
};
|
|
829 |
|
|
830 |
// A linked lists of heap regions. It leaves the "next" field
|
|
831 |
// unspecified; that's up to subtypes.
|
|
832 |
class RegionList {
|
|
833 |
protected:
|
|
834 |
virtual HeapRegion* get_next(HeapRegion* chr) = 0;
|
|
835 |
virtual void set_next(HeapRegion* chr,
|
|
836 |
HeapRegion* new_next) = 0;
|
|
837 |
|
|
838 |
HeapRegion* _hd;
|
|
839 |
HeapRegion* _tl;
|
|
840 |
size_t _sz;
|
|
841 |
|
|
842 |
// Protected constructor because this type is only meaningful
|
|
843 |
// when the _get/_set next functions are defined.
|
|
844 |
RegionList() : _hd(NULL), _tl(NULL), _sz(0) {}
|
|
845 |
public:
|
|
846 |
void reset() {
|
|
847 |
_hd = NULL;
|
|
848 |
_tl = NULL;
|
|
849 |
_sz = 0;
|
|
850 |
}
|
|
851 |
HeapRegion* hd() { return _hd; }
|
|
852 |
HeapRegion* tl() { return _tl; }
|
|
853 |
size_t sz() { return _sz; }
|
|
854 |
size_t length();
|
|
855 |
|
|
856 |
bool well_formed() {
|
|
857 |
return
|
|
858 |
((hd() == NULL && tl() == NULL && sz() == 0)
|
|
859 |
|| (hd() != NULL && tl() != NULL && sz() > 0))
|
|
860 |
&& (sz() == length());
|
|
861 |
}
|
|
862 |
virtual void insert_before_head(HeapRegion* r);
|
|
863 |
void prepend_list(RegionList* new_list);
|
|
864 |
virtual HeapRegion* pop();
|
|
865 |
void dec_sz() { _sz--; }
|
|
866 |
// Requires that "r" is an element of the list, and is not the tail.
|
|
867 |
void delete_after(HeapRegion* r);
|
|
868 |
};
|
|
869 |
|
|
870 |
class EmptyNonHRegionList: public RegionList {
|
|
871 |
protected:
|
|
872 |
// Protected constructor because this type is only meaningful
|
|
873 |
// when the _get/_set next functions are defined.
|
|
874 |
EmptyNonHRegionList() : RegionList() {}
|
|
875 |
|
|
876 |
public:
|
|
877 |
void insert_before_head(HeapRegion* r) {
|
|
878 |
// assert(r->is_empty(), "Better be empty");
|
|
879 |
assert(!r->isHumongous(), "Better not be humongous.");
|
|
880 |
RegionList::insert_before_head(r);
|
|
881 |
}
|
|
882 |
void prepend_list(EmptyNonHRegionList* new_list) {
|
|
883 |
// assert(new_list->hd() == NULL || new_list->hd()->is_empty(),
|
|
884 |
// "Better be empty");
|
|
885 |
assert(new_list->hd() == NULL || !new_list->hd()->isHumongous(),
|
|
886 |
"Better not be humongous.");
|
|
887 |
// assert(new_list->tl() == NULL || new_list->tl()->is_empty(),
|
|
888 |
// "Better be empty");
|
|
889 |
assert(new_list->tl() == NULL || !new_list->tl()->isHumongous(),
|
|
890 |
"Better not be humongous.");
|
|
891 |
RegionList::prepend_list(new_list);
|
|
892 |
}
|
|
893 |
};
|
|
894 |
|
|
895 |
class UncleanRegionList: public EmptyNonHRegionList {
|
|
896 |
public:
|
|
897 |
HeapRegion* get_next(HeapRegion* hr) {
|
|
898 |
return hr->next_from_unclean_list();
|
|
899 |
}
|
|
900 |
void set_next(HeapRegion* hr, HeapRegion* new_next) {
|
|
901 |
hr->set_next_on_unclean_list(new_next);
|
|
902 |
}
|
|
903 |
|
|
904 |
UncleanRegionList() : EmptyNonHRegionList() {}
|
|
905 |
|
|
906 |
void insert_before_head(HeapRegion* r) {
|
|
907 |
assert(!r->is_on_free_list(),
|
|
908 |
"Better not already be on free list");
|
|
909 |
assert(!r->is_on_unclean_list(),
|
|
910 |
"Better not already be on unclean list");
|
|
911 |
r->set_zero_fill_needed();
|
|
912 |
r->set_on_unclean_list(true);
|
|
913 |
EmptyNonHRegionList::insert_before_head(r);
|
|
914 |
}
|
|
915 |
void prepend_list(UncleanRegionList* new_list) {
|
|
916 |
assert(new_list->tl() == NULL || !new_list->tl()->is_on_free_list(),
|
|
917 |
"Better not already be on free list");
|
|
918 |
assert(new_list->tl() == NULL || new_list->tl()->is_on_unclean_list(),
|
|
919 |
"Better already be marked as on unclean list");
|
|
920 |
assert(new_list->hd() == NULL || !new_list->hd()->is_on_free_list(),
|
|
921 |
"Better not already be on free list");
|
|
922 |
assert(new_list->hd() == NULL || new_list->hd()->is_on_unclean_list(),
|
|
923 |
"Better already be marked as on unclean list");
|
|
924 |
EmptyNonHRegionList::prepend_list(new_list);
|
|
925 |
}
|
|
926 |
HeapRegion* pop() {
|
|
927 |
HeapRegion* res = RegionList::pop();
|
|
928 |
if (res != NULL) res->set_on_unclean_list(false);
|
|
929 |
return res;
|
|
930 |
}
|
|
931 |
};
|
|
932 |
|
|
933 |
// Local Variables: ***
|
|
934 |
// c-indentation-style: gnu ***
|
|
935 |
// End: ***
|
|
936 |
|
|
937 |
#endif // SERIALGC
|