0 /*
1  * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 #include "precompiled.hpp"
24 #include "gc/z/zLock.inline.hpp"

25 #include "gc/z/zNMethodData.hpp"
26 #include "memory/allocation.hpp"
27 #include "runtime/atomic.hpp"
28 #include "runtime/orderAccess.hpp"
29 #include "utilities/align.hpp"
30 #include "utilities/debug.hpp"
31 #include "utilities/globalCounter.inline.hpp"
32 #include "utilities/growableArray.hpp"
33 
34 size_t ZNMethodDataOops::header_size() {
35   const size_t size = sizeof(ZNMethodDataOops);
36   assert(is_aligned(size, sizeof(oop*)), "Header misaligned");
37   return size;
38 }
39 
40 ZNMethodDataOops* ZNMethodDataOops::create(const GrowableArray<oop*>& immediates, bool has_non_immediates) {
41   // Allocate memory for the ZNMethodDataOops object
42   // plus the immediate oop* array that follows right after.
43   const size_t size = ZNMethodDataOops::header_size() + (sizeof(oop*) * immediates.length());
44   void* const mem = NEW_C_HEAP_ARRAY(uint8_t, size, mtGC);
45   return ::new (mem) ZNMethodDataOops(immediates, has_non_immediates);
46 }
47 
48 void ZNMethodDataOops::destroy(ZNMethodDataOops* oops) {
49   FREE_C_HEAP_ARRAY(uint8_t, oops);
50 }
51 
52 ZNMethodDataOops::ZNMethodDataOops(const GrowableArray<oop*>& immediates, bool has_non_immediates) :
53     _nimmediates(immediates.length()),
54     _has_non_immediates(has_non_immediates) {
55   // Save all immediate oops
56   for (size_t i = 0; i < _nimmediates; i++) {
57     immediates_begin()[i] = immediates.at(i);
58   }
59 }
60 
61 size_t ZNMethodDataOops::immediates_count() const {
62   return _nimmediates;
63 }
64 
65 oop** ZNMethodDataOops::immediates_begin() const {
66   // The immediate oop* array starts immediately after this object
67   return (oop**)((uintptr_t)this + header_size());
68 }
69 
70 oop** ZNMethodDataOops::immediates_end() const {
71   return immediates_begin() + immediates_count();
72 }
73 
74 bool ZNMethodDataOops::has_non_immediates() const {
75   return _has_non_immediates;
76 }
77 
78 ZNMethodData::ZNMethodData() :
79     _lock(),
80     _oops(NULL) {}
81 
82 ZNMethodData::~ZNMethodData() {
83   ZNMethodDataOops::destroy(_oops);
84 }
85 
86 ZReentrantLock* ZNMethodData::lock() {
87   return &_lock;
88 }
89 
90 ZNMethodDataOops* ZNMethodData::oops() const {
91   return OrderAccess::load_acquire(&_oops);
92 }
93 
94 ZNMethodDataOops* ZNMethodData::swap_oops(ZNMethodDataOops* new_oops) {
95   ZNMethodDataOops* const oops = Atomic::xchg(new_oops, &_oops);
96   if (oops != NULL) {
97     GlobalCounter::write_synchronize();
98   }
99   return oops;
100 }
--- EOF ---