1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef SHARE_GC_Z_ZOBJECTALLOCATOR_HPP
  25 #define SHARE_GC_Z_ZOBJECTALLOCATOR_HPP
  26 
  27 #include "gc/z/zAllocationFlags.hpp"
  28 #include "gc/z/zPage.hpp"
  29 #include "gc/z/zValue.hpp"
  30 #include "memory/allocation.hpp"
  31 
  32 class ZObjectAllocator {
  33 private:
  34   const uint         _nworkers;
  35   ZPerCPU<size_t>    _used;
  36   ZContended<ZPage*> _shared_medium_page;
  37   ZPerCPU<ZPage*>    _shared_small_page;
  38   ZPerWorker<ZPage*> _worker_small_page;
  39 
  40   ZPage* alloc_page(uint8_t type, size_t size, ZAllocationFlags flags);
  41 
  42   // Allocate an object in a shared page. Allocate and
  43   // atomically install a new page if necessary.
  44   uintptr_t alloc_object_in_shared_page(ZPage** shared_page,
  45                                         uint8_t page_type,
  46                                         size_t page_size,
  47                                         size_t size,
  48                                         ZAllocationFlags flags);
  49 
  50   uintptr_t alloc_large_object(size_t size, ZAllocationFlags flags);
  51   uintptr_t alloc_medium_object(size_t size, ZAllocationFlags flags);
  52   uintptr_t alloc_small_object_from_nonworker(size_t size, ZAllocationFlags flags);
  53   uintptr_t alloc_small_object_from_worker(size_t size, ZAllocationFlags flags);
  54   uintptr_t alloc_small_object(size_t size, ZAllocationFlags flags);
  55   uintptr_t alloc_object(size_t size, ZAllocationFlags flags);
  56 
  57   bool undo_alloc_large_object(ZPage* page);
  58   bool undo_alloc_medium_object(ZPage* page, uintptr_t addr, size_t size);
  59   bool undo_alloc_small_object_from_nonworker(ZPage* page, uintptr_t addr, size_t size);
  60   bool undo_alloc_small_object_from_worker(ZPage* page, uintptr_t addr, size_t size);
  61   bool undo_alloc_small_object(ZPage* page, uintptr_t addr, size_t size);
  62   bool undo_alloc_object(ZPage* page, uintptr_t addr, size_t size);
  63 
  64 public:
  65   ZObjectAllocator(uint nworkers);
  66 
  67   uintptr_t alloc_object(size_t size);
  68 
  69   uintptr_t alloc_object_for_relocation(size_t size);
  70   void undo_alloc_object_for_relocation(ZPage* page, uintptr_t addr, size_t size);
  71 
  72   size_t used() const;
  73   size_t remaining() const;
  74 
  75   void retire_tlabs();
  76   void remap_tlabs();
  77 };
  78 
  79 #endif // SHARE_GC_Z_ZOBJECTALLOCATOR_HPP
--- EOF ---