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/zNMethodData.hpp" 27 #include "memory/allocation.hpp" 28 #include "runtime/atomic.hpp" 29 #include "runtime/orderAccess.hpp" 30 #include "utilities/align.hpp" 31 #include "utilities/debug.hpp" 32 #include "utilities/globalCounter.inline.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 = NEW_C_HEAP_ARRAY(uint8_t, size, mtGC); 46 return ::new (mem) ZNMethodDataOops(immediates, has_non_immediates); 47 } 48 49 void ZNMethodDataOops::destroy(ZNMethodDataOops* oops) { 50 FREE_C_HEAP_ARRAY(uint8_t, 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() : 80 _lock(), 81 _oops(NULL) {} 82 83 ZNMethodData::~ZNMethodData() { 84 ZNMethodDataOops::destroy(_oops); 85 } 86 87 ZReentrantLock* ZNMethodData::lock() { 88 return &_lock; 89 } 90 91 ZNMethodDataOops* ZNMethodData::oops() const { 92 return OrderAccess::load_acquire(&_oops); 93 } 94 95 ZNMethodDataOops* ZNMethodData::swap_oops(ZNMethodDataOops* new_oops) { 96 ZNMethodDataOops* const oops = Atomic::xchg(new_oops, &_oops); 97 if (oops != NULL) { 98 GlobalCounter::write_synchronize(); 99 } 100 return oops; 101 }