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 }