1 /*

     2  * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    19  * or visit www.oracle.com if you need additional information or have any

    20  * questions.

    21  *

    22  */

    23 

    24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGION_INLINE_HPP

    25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGION_INLINE_HPP

    26 

    27 #include "gc/shenandoah/shenandoahHeap.inline.hpp"

    28 #include "gc/shenandoah/shenandoahHeapRegion.hpp"

    29 #include "gc/shenandoah/shenandoahPacer.inline.hpp"

    30 #include "runtime/atomic.hpp"

    31 

    32 HeapWord* ShenandoahHeapRegion::allocate(size_t size, ShenandoahAllocRequest::Type type) {

    33   _heap->assert_heaplock_or_safepoint();

    34 

    35   HeapWord* obj = top();

    36   if (pointer_delta(end(), obj) >= size) {

    37     make_regular_allocation();

    38     adjust_alloc_metadata(type, size);

    39 

    40     HeapWord* new_top = obj + size;

    41     set_top(new_top);

    42     assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");

    43 

    44     return obj;

    45   } else {

    46     return NULL;

    47   }

    48 }

    49 

    50 inline void ShenandoahHeapRegion::adjust_alloc_metadata(ShenandoahAllocRequest::Type type, size_t size) {

    51   bool is_first_alloc = (top() == bottom());

    52 

    53   switch (type) {

    54     case ShenandoahAllocRequest::_alloc_shared:

    55     case ShenandoahAllocRequest::_alloc_tlab:

    56       _seqnum_last_alloc_mutator = _alloc_seq_num.value++;

    57       if (is_first_alloc) {

    58         assert (_seqnum_first_alloc_mutator == 0, "Region " SIZE_FORMAT " metadata is correct", _region_number);

    59         _seqnum_first_alloc_mutator = _seqnum_last_alloc_mutator;

    60       }

    61       break;

    62     case ShenandoahAllocRequest::_alloc_shared_gc:

    63     case ShenandoahAllocRequest::_alloc_gclab:

    64       _seqnum_last_alloc_gc = _alloc_seq_num.value++;

    65       if (is_first_alloc) {

    66         assert (_seqnum_first_alloc_gc == 0, "Region " SIZE_FORMAT " metadata is correct", _region_number);

    67         _seqnum_first_alloc_gc = _seqnum_last_alloc_gc;

    68       }

    69       break;

    70     default:

    71       ShouldNotReachHere();

    72   }

    73 

    74   switch (type) {

    75     case ShenandoahAllocRequest::_alloc_shared:

    76     case ShenandoahAllocRequest::_alloc_shared_gc:

    77       _shared_allocs += size;

    78       break;

    79     case ShenandoahAllocRequest::_alloc_tlab:

    80       _tlab_allocs += size;

    81       break;

    82     case ShenandoahAllocRequest::_alloc_gclab:

    83       _gclab_allocs += size;

    84       break;

    85     default:

    86       ShouldNotReachHere();

    87   }

    88 }

    89 

    90 inline void ShenandoahHeapRegion::increase_live_data_alloc_words(size_t s) {

    91   internal_increase_live_data(s);

    92 }

    93 

    94 inline void ShenandoahHeapRegion::increase_live_data_gc_words(size_t s) {

    95   internal_increase_live_data(s);

    96   if (ShenandoahPacing) {

    97     _pacer->report_mark(s);

    98   }

    99 }

   100 

   101 inline void ShenandoahHeapRegion::internal_increase_live_data(size_t s) {

   102   size_t new_live_data = Atomic::add(s, &_live_data);

   103 #ifdef ASSERT

   104   size_t live_bytes = new_live_data * HeapWordSize;

   105   size_t used_bytes = used();

   106   assert(live_bytes <= used_bytes,

   107          "can't have more live data than used: " SIZE_FORMAT ", " SIZE_FORMAT, live_bytes, used_bytes);

   108 #endif

   109 }

   110 

   111 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGION_INLINE_HPP