1 /*
   2  * Copyright (c) 2017, 2019, 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 #include "precompiled.hpp"
  25 #include "gc/z/zAttachedArray.inline.hpp"
  26 #include "gc/z/zLock.inline.hpp"
  27 #include "gc/z/zNMethodData.hpp"
  28 #include "memory/allocation.hpp"
  29 #include "runtime/atomic.hpp"
  30 #include "runtime/orderAccess.hpp"
  31 #include "utilities/align.hpp"
  32 #include "utilities/debug.hpp"
  33 #include "utilities/growableArray.hpp"
  34 
  35 ZNMethodDataOops* ZNMethodDataOops::create(const GrowableArray<oop*>& immediates, bool has_non_immediates) {
  36   return ::new (AttachedArray::alloc(immediates.length())) ZNMethodDataOops(immediates, has_non_immediates);
  37 }
  38 
  39 void ZNMethodDataOops::destroy(ZNMethodDataOops* oops) {
  40   AttachedArray::free(oops);
  41 }
  42 
  43 ZNMethodDataOops::ZNMethodDataOops(const GrowableArray<oop*>& immediates, bool has_non_immediates) :
  44     _immediates(immediates.length()),
  45     _has_non_immediates(has_non_immediates) {
  46   // Save all immediate oops
  47   for (size_t i = 0; i < immediates_count(); i++) {
  48     immediates_begin()[i] = immediates.at(int(i));
  49   }
  50 }
  51 
  52 size_t ZNMethodDataOops::immediates_count() const {
  53   return _immediates.length();
  54 }
  55 
  56 oop** ZNMethodDataOops::immediates_begin() const {
  57   return _immediates(this);
  58 }
  59 
  60 oop** ZNMethodDataOops::immediates_end() const {
  61   return immediates_begin() + immediates_count();
  62 }
  63 
  64 bool ZNMethodDataOops::has_non_immediates() const {
  65   return _has_non_immediates;
  66 }
  67 
  68 ZNMethodData::ZNMethodData() :
  69     _lock(),
  70     _oops(NULL) {}
  71 
  72 ZNMethodData::~ZNMethodData() {
  73   ZNMethodDataOops::destroy(_oops);
  74 }
  75 
  76 ZReentrantLock* ZNMethodData::lock() {
  77   return &_lock;
  78 }
  79 
  80 ZNMethodDataOops* ZNMethodData::oops() const {
  81   return OrderAccess::load_acquire(&_oops);
  82 }
  83 
  84 ZNMethodDataOops* ZNMethodData::swap_oops(ZNMethodDataOops* new_oops) {
  85   ZLocker<ZReentrantLock> locker(&_lock);
  86   ZNMethodDataOops* const old_oops = _oops;
  87   _oops = new_oops;
  88   return old_oops;
  89 }