1 /* 2 * Copyright (c) 2005, 2022, 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 25 #ifndef SHARE_OOPS_KLASS_INLINE_HPP 26 #define SHARE_OOPS_KLASS_INLINE_HPP 27 28 #include "oops/klass.hpp" 29 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "oops/klassVtable.hpp" 32 #include "oops/markWord.hpp" 33 34 // This loads and keeps the klass's loader alive. 35 inline oop Klass::klass_holder() const { 36 return class_loader_data()->holder(); 37 } 38 39 inline bool Klass::is_non_strong_hidden() const { 40 return access_flags().is_hidden_class() && 41 class_loader_data()->has_class_mirror_holder(); 42 } 43 44 // Iff the class loader (or mirror for non-strong hidden classes) is alive the 45 // Klass is considered alive. This is safe to call before the CLD is marked as 46 // unloading, and hence during concurrent class unloading. 47 // This returns false if the Klass is unloaded, or about to be unloaded because the holder of 48 // the CLD is no longer strongly reachable. 49 // The return value of this function may change from true to false after a safepoint. So the caller 50 // of this function must ensure that a safepoint doesn't happen while interpreting the return value. 51 inline bool Klass::is_loader_alive() const { 52 return class_loader_data()->is_alive(); 53 } 54 55 inline oop Klass::java_mirror() const { 56 return _java_mirror.resolve(); 57 } 58 59 inline klassVtable Klass::vtable() const { 60 return klassVtable(const_cast<Klass*>(this), start_of_vtable(), vtable_length() / vtableEntry::size()); 61 } 62 63 inline oop Klass::class_loader() const { 64 return class_loader_data()->class_loader(); 65 } 66 67 inline vtableEntry* Klass::start_of_vtable() const { 68 return (vtableEntry*) ((address)this + in_bytes(vtable_start_offset())); 69 } 70 71 inline ByteSize Klass::vtable_start_offset() { 72 return in_ByteSize(InstanceKlass::header_size() * wordSize); 73 } 74 75 #endif // SHARE_OOPS_KLASS_INLINE_HPP