jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSeq.hpp@0ac769a57c64 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSeq.hpp@0ac769a57c64 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSeq.hpp

Tue, 01 Mar 2011 14:56:48 -0800

author: iveresov
date: Tue, 01 Mar 2011 14:56:48 -0800
changeset 2606: 0ac769a57c64
parent 2472: 0fa27f37d4d4
child 2643: 1216415d8e35
permissions: -rw-r--r--

6627983: G1: Bad oop deference during marking
Summary: Bulk zeroing reduction didn't work with G1, because arraycopy would call pre-barriers on uninitialized oops. The solution is to have version of arraycopy stubs that don't have pre-barriers. Also refactored arraycopy stubs generation on SPARC to be more readable and reduced the number of stubs necessary in some cases.
Reviewed-by: jrose, kvn, never

 /*
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  * 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.
  *
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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
 #include "gc_implementation/g1/heapRegion.hpp"
 #include "utilities/growableArray.hpp"
 class HeapRegion;
 class HeapRegionClosure;
 class HeapRegionSeq: public CHeapObj {
   // _regions is kept sorted by start address order, and no two regions are
   // overlapping.
   GrowableArray<HeapRegion*> _regions;
   // The index in "_regions" at which to start the next allocation search.
   // (For efficiency only; private to obj_allocate after initialization.)
   int _alloc_search_start;
   // Finds a contiguous set of empty regions of length num, starting
   // from a given index.
   int find_contiguous_from(int from, size_t num);
   // Currently, we're choosing collection sets in a round-robin fashion,
   // starting here.
   int _next_rr_candidate;
   // The bottom address of the bottom-most region, or else NULL if there
   // are no regions in the sequence.
   char* _seq_bottom;
  public:
   // Initializes "this" to the empty sequence of regions.
   HeapRegionSeq(const size_t max_size);
   // Adds "hr" to "this" sequence.  Requires "hr" not to overlap with
   // any region already in "this".  (Will perform better if regions are
   // inserted in ascending address order.)
   void insert(HeapRegion* hr);
   // Given a HeapRegion*, returns its index within _regions,
   // or returns -1 if not found.
   int find(HeapRegion* hr);
   // Requires the index to be valid, and return the region at the index.
   HeapRegion* at(size_t i) { return _regions.at((int)i); }
   // Return the number of regions in the sequence.
   size_t length();
   // Returns the number of contiguous regions at the end of the sequence
   // that are available for allocation.
   size_t free_suffix();
   // Finds a contiguous set of empty regions of length num.
   int find_contiguous(size_t num);
   // Apply the "doHeapRegion" method of "blk" to all regions in "this",
   // in address order, terminating the iteration early
   // if the "doHeapRegion" method returns "true".
   void iterate(HeapRegionClosure* blk);
   // Apply the "doHeapRegion" method of "blk" to all regions in "this",
   // starting at "r" (or first region, if "r" is NULL), in a circular
   // manner, terminating the iteration early if the "doHeapRegion" method
   // returns "true".
   void iterate_from(HeapRegion* r, HeapRegionClosure* blk);
   // As above, but start from a given index in the sequence
   // instead of a given heap region.
   void iterate_from(int idx, HeapRegionClosure* blk);
   // Requires "shrink_bytes" to be a multiple of the page size and heap
   // region granularity.  Deletes as many "rightmost" completely free heap
   // regions from the sequence as comprise shrink_bytes bytes.  Returns the
   // MemRegion indicating the region those regions comprised, and sets
   // "num_regions_deleted" to the number of regions deleted.
   MemRegion shrink_by(size_t shrink_bytes, size_t& num_regions_deleted);
   // If "addr" falls within a region in the sequence, return that region,
   // or else NULL.
   inline HeapRegion* addr_to_region(const void* addr);
   void print();
   // Prints out runs of empty regions.
   void print_empty_runs();
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP

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src/share/vm/gc_implementation/g1/heapRegionSeq.hpp@0ac769a57c64 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSeq.hpp