jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp

Mon, 07 Jul 2014 10:12:40 +0200

author: stefank
date: Mon, 07 Jul 2014 10:12:40 +0200
changeset 6992: 2c6ef90f030a
parent 6990: 1526a938e670
child 7051: 1f1d373cd044
permissions: -rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

 /*
  * Copyright (c) 2001, 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_G1_G1BLOCKOFFSETTABLE_INLINE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP
 #include "gc_implementation/g1/g1BlockOffsetTable.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/heapRegion.inline.hpp"
 #include "memory/space.hpp"
 inline HeapWord* G1BlockOffsetTable::block_start(const void* addr) {
   if (addr >= _bottom && addr < _end) {
     return block_start_unsafe(addr);
   } else {
     return NULL;
   }
 }
 inline HeapWord*
 G1BlockOffsetTable::block_start_const(const void* addr) const {
   if (addr >= _bottom && addr < _end) {
     return block_start_unsafe_const(addr);
   } else {
     return NULL;
   }
 }
 inline size_t G1BlockOffsetSharedArray::index_for(const void* p) const {
   char* pc = (char*)p;
   assert(pc >= (char*)_reserved.start() &&
          pc <  (char*)_reserved.end(),
          err_msg("p (" PTR_FORMAT ") not in reserved [" PTR_FORMAT ", " PTR_FORMAT ")",
                  p2i(p), p2i(_reserved.start()), p2i(_reserved.end())));
   size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char));
   size_t result = delta >> LogN;
   check_index(result, "bad index from address");
   return result;
 }
 inline HeapWord*
 G1BlockOffsetSharedArray::address_for_index(size_t index) const {
   check_index(index, "index out of range");
   HeapWord* result = _reserved.start() + (index << LogN_words);
   assert(result >= _reserved.start() && result < _reserved.end(),
          err_msg("bad address from index result " PTR_FORMAT
                  " _reserved.start() " PTR_FORMAT " _reserved.end() "
                  PTR_FORMAT,
                  p2i(result), p2i(_reserved.start()), p2i(_reserved.end())));
   return result;
 }
 inline size_t
 G1BlockOffsetArray::block_size(const HeapWord* p) const {
   return gsp()->block_size(p);
 }
 inline HeapWord*
 G1BlockOffsetArray::block_at_or_preceding(const void* addr,
                                           bool has_max_index,
                                           size_t max_index) const {
   assert(_array->offset_array(0) == 0, "objects can't cross covered areas");
   size_t index = _array->index_for(addr);
   // We must make sure that the offset table entry we use is valid.  If
   // "addr" is past the end, start at the last known one and go forward.
   if (has_max_index) {
     index = MIN2(index, max_index);
   }
   HeapWord* q = _array->address_for_index(index);
   uint offset = _array->offset_array(index);  // Extend u_char to uint.
   while (offset >= N_words) {
     // The excess of the offset from N_words indicates a power of Base
     // to go back by.
     size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset);
     q -= (N_words * n_cards_back);
     assert(q >= gsp()->bottom(), "Went below bottom!");
     index -= n_cards_back;
     offset = _array->offset_array(index);
   }
   assert(offset < N_words, "offset too large");
   q -= offset;
   return q;
 }
 inline HeapWord*
 G1BlockOffsetArray::
 forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n,
                                        const void* addr) const {
   if (addr >= gsp()->top()) return gsp()->top();
   while (n <= addr) {
     q = n;
     oop obj = oop(q);
     if (obj->klass_or_null() == NULL) return q;
     n += block_size(q);
   }
   assert(q <= n, "wrong order for q and addr");
   assert(addr < n, "wrong order for addr and n");
   return q;
 }
 inline HeapWord*
 G1BlockOffsetArray::forward_to_block_containing_addr(HeapWord* q,
                                                      const void* addr) {
   if (oop(q)->klass_or_null() == NULL) return q;
   HeapWord* n = q + block_size(q);
   // In the normal case, where the query "addr" is a card boundary, and the
   // offset table chunks are the same size as cards, the block starting at
   // "q" will contain addr, so the test below will fail, and we'll fall
   // through quickly.
   if (n <= addr) {
     q = forward_to_block_containing_addr_slow(q, n, addr);
   }
   assert(q <= addr, "wrong order for current and arg");
   return q;
 }
 //////////////////////////////////////////////////////////////////////////
 // BlockOffsetArrayNonContigSpace inlines
 //////////////////////////////////////////////////////////////////////////
 inline void G1BlockOffsetArray::freed(HeapWord* blk_start, HeapWord* blk_end) {
   // Verify that the BOT shows [blk_start, blk_end) to be one block.
   verify_single_block(blk_start, blk_end);
   // adjust _unallocated_block upward or downward
   // as appropriate
   if (BlockOffsetArrayUseUnallocatedBlock) {
     assert(_unallocated_block <= _end,
            "Inconsistent value for _unallocated_block");
     if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) {
       // CMS-specific note: a block abutting _unallocated_block to
       // its left is being freed, a new block is being added or
       // we are resetting following a compaction
       _unallocated_block = blk_start;
     }
   }
 }
 inline void G1BlockOffsetArray::freed(HeapWord* blk, size_t size) {
   freed(blk, blk + size);
 }
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp@2c6ef90f030a (annotated)

src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp