jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 2005, 2014, 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.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP
 #include "memory/memRegion.hpp"
 #include "oops/oop.hpp"
 #include "utilities/bitMap.hpp"
 class ParMarkBitMapClosure;
 class PSVirtualSpace;
 class ParMarkBitMap: public CHeapObj<mtGC>
 {
 public:
   typedef BitMap::idx_t idx_t;
   // Values returned by the iterate() methods.
   enum IterationStatus { incomplete, complete, full, would_overflow };
   inline ParMarkBitMap();
   bool initialize(MemRegion covered_region);
   // Atomically mark an object as live.
   bool mark_obj(HeapWord* addr, size_t size);
   inline bool mark_obj(oop obj, int size);
   // Return whether the specified begin or end bit is set.
   inline bool is_obj_beg(idx_t bit) const;
   inline bool is_obj_end(idx_t bit) const;
   // Traditional interface for testing whether an object is marked or not (these
   // test only the begin bits).
   inline bool is_marked(idx_t bit)      const;
   inline bool is_marked(HeapWord* addr) const;
   inline bool is_marked(oop obj)        const;
   inline bool is_unmarked(idx_t bit)      const;
   inline bool is_unmarked(HeapWord* addr) const;
   inline bool is_unmarked(oop obj)        const;
   // Convert sizes from bits to HeapWords and back.  An object that is n bits
   // long will be bits_to_words(n) words long.  An object that is m words long
   // will take up words_to_bits(m) bits in the bitmap.
   inline static size_t bits_to_words(idx_t bits);
   inline static idx_t  words_to_bits(size_t words);
   // Return the size in words of an object given a begin bit and an end bit, or
   // the equivalent beg_addr and end_addr.
   inline size_t obj_size(idx_t beg_bit, idx_t end_bit) const;
   inline size_t obj_size(HeapWord* beg_addr, HeapWord* end_addr) const;
   // Return the size in words of the object (a search is done for the end bit).
   inline size_t obj_size(idx_t beg_bit)  const;
   inline size_t obj_size(HeapWord* addr) const;
   // Apply live_closure to each live object that lies completely within the
   // range [live_range_beg, live_range_end).  This is used to iterate over the
   // compacted region of the heap.  Return values:
   //
   // incomplete         The iteration is not complete.  The last object that
   //                    begins in the range does not end in the range;
   //                    closure->source() is set to the start of that object.
   //
   // complete           The iteration is complete.  All objects in the range
   //                    were processed and the closure is not full;
   //                    closure->source() is set one past the end of the range.
   //
   // full               The closure is full; closure->source() is set to one
   //                    past the end of the last object processed.
   //
   // would_overflow     The next object in the range would overflow the closure;
   //                    closure->source() is set to the start of that object.
   IterationStatus iterate(ParMarkBitMapClosure* live_closure,
                           idx_t range_beg, idx_t range_end) const;
   inline IterationStatus iterate(ParMarkBitMapClosure* live_closure,
                                  HeapWord* range_beg,
                                  HeapWord* range_end) const;
   // Apply live closure as above and additionally apply dead_closure to all dead
   // space in the range [range_beg, dead_range_end).  Note that dead_range_end
   // must be >= range_end.  This is used to iterate over the dense prefix.
   //
   // This method assumes that if the first bit in the range (range_beg) is not
   // marked, then dead space begins at that point and the dead_closure is
   // applied.  Thus callers must ensure that range_beg is not in the middle of a
   // live object.
   IterationStatus iterate(ParMarkBitMapClosure* live_closure,
                           ParMarkBitMapClosure* dead_closure,
                           idx_t range_beg, idx_t range_end,
                           idx_t dead_range_end) const;
   inline IterationStatus iterate(ParMarkBitMapClosure* live_closure,
                                  ParMarkBitMapClosure* dead_closure,
                                  HeapWord* range_beg,
                                  HeapWord* range_end,
                                  HeapWord* dead_range_end) const;
   // Return the number of live words in the range [beg_addr, end_obj) due to
   // objects that start in the range.  If a live object extends onto the range,
   // the caller must detect and account for any live words due to that object.
   // If a live object extends beyond the end of the range, only the words within
   // the range are included in the result. The end of the range must be a live object,
   // which is the case when updating pointers.  This allows a branch to be removed
   // from inside the loop.
   size_t live_words_in_range(HeapWord* beg_addr, oop end_obj) const;
   inline HeapWord* region_start() const;
   inline HeapWord* region_end() const;
   inline size_t    region_size() const;
   inline size_t    size() const;
   size_t reserved_byte_size() const { return _reserved_byte_size; }
   // Convert a heap address to/from a bit index.
   inline idx_t     addr_to_bit(HeapWord* addr) const;
   inline HeapWord* bit_to_addr(idx_t bit) const;
   // Return the bit index of the first marked object that begins (or ends,
   // respectively) in the range [beg, end).  If no object is found, return end.
   inline idx_t find_obj_beg(idx_t beg, idx_t end) const;
   inline idx_t find_obj_end(idx_t beg, idx_t end) const;
   inline HeapWord* find_obj_beg(HeapWord* beg, HeapWord* end) const;
   inline HeapWord* find_obj_end(HeapWord* beg, HeapWord* end) const;
   // Clear a range of bits or the entire bitmap (both begin and end bits are
   // cleared).
   inline void clear_range(idx_t beg, idx_t end);
   // Return the number of bits required to represent the specified number of
   // HeapWords, or the specified region.
   static inline idx_t bits_required(size_t words);
   static inline idx_t bits_required(MemRegion covered_region);
   void print_on_error(outputStream* st) const {
     st->print_cr("Marking Bits: (ParMarkBitMap*) " PTR_FORMAT, p2i(this));
     _beg_bits.print_on_error(st, " Begin Bits: ");
     _end_bits.print_on_error(st, " End Bits:   ");
   }
 #ifdef  ASSERT
   void verify_clear() const;
   inline void verify_bit(idx_t bit) const;
   inline void verify_addr(HeapWord* addr) const;
 #endif  // #ifdef ASSERT
 private:
   // Each bit in the bitmap represents one unit of 'object granularity.' Objects
   // are double-word aligned in 32-bit VMs, but not in 64-bit VMs, so the 32-bit
   // granularity is 2, 64-bit is 1.
   static inline size_t obj_granularity() { return size_t(MinObjAlignment); }
   static inline int obj_granularity_shift() { return LogMinObjAlignment; }
   HeapWord*       _region_start;
   size_t          _region_size;
   BitMap          _beg_bits;
   BitMap          _end_bits;
   PSVirtualSpace* _virtual_space;
   size_t          _reserved_byte_size;
 };
 inline ParMarkBitMap::ParMarkBitMap():
   _beg_bits(), _end_bits(), _region_start(NULL), _region_size(0), _virtual_space(NULL), _reserved_byte_size(0)
 { }
 inline void ParMarkBitMap::clear_range(idx_t beg, idx_t end)
 {
   _beg_bits.clear_range(beg, end);
   _end_bits.clear_range(beg, end);
 }
 inline ParMarkBitMap::idx_t
 ParMarkBitMap::bits_required(size_t words)
 {
   // Need two bits (one begin bit, one end bit) for each unit of 'object
   // granularity' in the heap.
   return words_to_bits(words * 2);
 }
 inline ParMarkBitMap::idx_t
 ParMarkBitMap::bits_required(MemRegion covered_region)
 {
   return bits_required(covered_region.word_size());
 }
 inline HeapWord*
 ParMarkBitMap::region_start() const
 {
   return _region_start;
 }
 inline HeapWord*
 ParMarkBitMap::region_end() const
 {
   return region_start() + region_size();
 }
 inline size_t
 ParMarkBitMap::region_size() const
 {
   return _region_size;
 }
 inline size_t
 ParMarkBitMap::size() const
 {
   return _beg_bits.size();
 }
 inline bool ParMarkBitMap::is_obj_beg(idx_t bit) const
 {
   return _beg_bits.at(bit);
 }
 inline bool ParMarkBitMap::is_obj_end(idx_t bit) const
 {
   return _end_bits.at(bit);
 }
 inline bool ParMarkBitMap::is_marked(idx_t bit) const
 {
   return is_obj_beg(bit);
 }
 inline bool ParMarkBitMap::is_marked(HeapWord* addr) const
 {
   return is_marked(addr_to_bit(addr));
 }
 inline bool ParMarkBitMap::is_marked(oop obj) const
 {
   return is_marked((HeapWord*)obj);
 }
 inline bool ParMarkBitMap::is_unmarked(idx_t bit) const
 {
   return !is_marked(bit);
 }
 inline bool ParMarkBitMap::is_unmarked(HeapWord* addr) const
 {
   return !is_marked(addr);
 }
 inline bool ParMarkBitMap::is_unmarked(oop obj) const
 {
   return !is_marked(obj);
 }
 inline size_t
 ParMarkBitMap::bits_to_words(idx_t bits)
 {
   return bits << obj_granularity_shift();
 }
 inline ParMarkBitMap::idx_t
 ParMarkBitMap::words_to_bits(size_t words)
 {
   return words >> obj_granularity_shift();
 }
 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const
 {
   DEBUG_ONLY(verify_bit(beg_bit);)
   DEBUG_ONLY(verify_bit(end_bit);)
   return bits_to_words(end_bit - beg_bit + 1);
 }
 inline size_t
 ParMarkBitMap::obj_size(HeapWord* beg_addr, HeapWord* end_addr) const
 {
   DEBUG_ONLY(verify_addr(beg_addr);)
   DEBUG_ONLY(verify_addr(end_addr);)
   return pointer_delta(end_addr, beg_addr) + obj_granularity();
 }
 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit) const
 {
   const idx_t end_bit = _end_bits.get_next_one_offset_inline(beg_bit, size());
   assert(is_marked(beg_bit), "obj not marked");
   assert(end_bit < size(), "end bit missing");
   return obj_size(beg_bit, end_bit);
 }
 inline size_t ParMarkBitMap::obj_size(HeapWord* addr) const
 {
   return obj_size(addr_to_bit(addr));
 }
 inline ParMarkBitMap::IterationStatus
 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure,
                        HeapWord* range_beg,
                        HeapWord* range_end) const
 {
   return iterate(live_closure, addr_to_bit(range_beg), addr_to_bit(range_end));
 }
 inline ParMarkBitMap::IterationStatus
 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure,
                        ParMarkBitMapClosure* dead_closure,
                        HeapWord* range_beg,
                        HeapWord* range_end,
                        HeapWord* dead_range_end) const
 {
   return iterate(live_closure, dead_closure,
                  addr_to_bit(range_beg), addr_to_bit(range_end),
                  addr_to_bit(dead_range_end));
 }
 inline bool
 ParMarkBitMap::mark_obj(oop obj, int size)
 {
   return mark_obj((HeapWord*)obj, (size_t)size);
 }
 inline BitMap::idx_t
 ParMarkBitMap::addr_to_bit(HeapWord* addr) const
 {
   DEBUG_ONLY(verify_addr(addr);)
   return words_to_bits(pointer_delta(addr, region_start()));
 }
 inline HeapWord*
 ParMarkBitMap::bit_to_addr(idx_t bit) const
 {
   DEBUG_ONLY(verify_bit(bit);)
   return region_start() + bits_to_words(bit);
 }
 inline ParMarkBitMap::idx_t
 ParMarkBitMap::find_obj_beg(idx_t beg, idx_t end) const
 {
   return _beg_bits.get_next_one_offset_inline_aligned_right(beg, end);
 }
 inline ParMarkBitMap::idx_t
 ParMarkBitMap::find_obj_end(idx_t beg, idx_t end) const
 {
   return _end_bits.get_next_one_offset_inline_aligned_right(beg, end);
 }
 inline HeapWord*
 ParMarkBitMap::find_obj_beg(HeapWord* beg, HeapWord* end) const
 {
   const idx_t beg_bit = addr_to_bit(beg);
   const idx_t end_bit = addr_to_bit(end);
   const idx_t search_end = BitMap::word_align_up(end_bit);
   const idx_t res_bit = MIN2(find_obj_beg(beg_bit, search_end), end_bit);
   return bit_to_addr(res_bit);
 }
 inline HeapWord*
 ParMarkBitMap::find_obj_end(HeapWord* beg, HeapWord* end) const
 {
   const idx_t beg_bit = addr_to_bit(beg);
   const idx_t end_bit = addr_to_bit(end);
   const idx_t search_end = BitMap::word_align_up(end_bit);
   const idx_t res_bit = MIN2(find_obj_end(beg_bit, search_end), end_bit);
   return bit_to_addr(res_bit);
 }
 #ifdef  ASSERT
 inline void ParMarkBitMap::verify_bit(idx_t bit) const {
   // Allow one past the last valid bit; useful for loop bounds.
   assert(bit <= _beg_bits.size(), "bit out of range");
 }
 inline void ParMarkBitMap::verify_addr(HeapWord* addr) const {
   // Allow one past the last valid address; useful for loop bounds.
   assert(addr >= region_start(),
       err_msg("addr too small, addr: " PTR_FORMAT " region start: " PTR_FORMAT, p2i(addr), p2i(region_start())));
   assert(addr <= region_end(),
       err_msg("addr too big, addr: " PTR_FORMAT " region end: " PTR_FORMAT, p2i(addr), p2i(region_end())));
 }
 #endif  // #ifdef ASSERT
 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.hpp