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/zLock.inline.hpp"
  26 #include "gc/z/zNMethodAllocator.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 size_t ZNMethodDataOops::header_size() {
  36   const size_t size = sizeof(ZNMethodDataOops);
  37   assert(is_aligned(size, sizeof(oop*)), "Header misaligned");
  38   return size;
  39 }
  40 
  41 ZNMethodDataOops* ZNMethodDataOops::create(const GrowableArray<oop*>& immediates, bool has_non_immediates) {
  42   // Allocate memory for the ZNMethodDataOops object
  43   // plus the immediate oop* array that follows right after.
  44   const size_t size = ZNMethodDataOops::header_size() + (sizeof(oop*) * immediates.length());
  45   void* const mem = ZNMethodAllocator::allocate(size);
  46   return ::new (mem) ZNMethodDataOops(immediates, has_non_immediates);
  47 }
  48 
  49 void ZNMethodDataOops::destroy(ZNMethodDataOops* oops) {
  50   ZNMethodAllocator::free(oops);
  51 }
  52 
  53 ZNMethodDataOops::ZNMethodDataOops(const GrowableArray<oop*>& immediates, bool has_non_immediates) :
  54     _nimmediates(immediates.length()),
  55     _has_non_immediates(has_non_immediates) {
  56   // Save all immediate oops
  57   for (size_t i = 0; i < _nimmediates; i++) {
  58     immediates_begin()[i] = immediates.at(i);
  59   }
  60 }
  61 
  62 size_t ZNMethodDataOops::immediates_count() const {
  63   return _nimmediates;
  64 }
  65 
  66 oop** ZNMethodDataOops::immediates_begin() const {
  67   // The immediate oop* array starts immediately after this object
  68   return (oop**)((uintptr_t)this + header_size());
  69 }
  70 
  71 oop** ZNMethodDataOops::immediates_end() const {
  72   return immediates_begin() + immediates_count();
  73 }
  74 
  75 bool ZNMethodDataOops::has_non_immediates() const {
  76   return _has_non_immediates;
  77 }
  78 
  79 ZNMethodData* ZNMethodData::create(nmethod* nm) {
  80   void* const mem = ZNMethodAllocator::allocate(sizeof(ZNMethodData));
  81   return ::new (mem) ZNMethodData(nm);
  82 }
  83 
  84 void ZNMethodData::destroy(ZNMethodData* data) {
  85   ZNMethodAllocator::free(data->oops());
  86   ZNMethodAllocator::free(data);
  87 }
  88 
  89 ZNMethodData::ZNMethodData(nmethod* nm) :
  90     _lock(),
  91     _oops(NULL) {}
  92 
  93 ZReentrantLock* ZNMethodData::lock() {
  94   return &_lock;
  95 }
  96 
  97 ZNMethodDataOops* ZNMethodData::oops() const {
  98   return OrderAccess::load_acquire(&_oops);
  99 }
 100 
 101 ZNMethodDataOops* ZNMethodData::swap_oops(ZNMethodDataOops* new_oops) {
 102   return Atomic::xchg(new_oops, &_oops);
 103 }