1 /* 2 * Copyright (c) 1998, 2004, 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 // A compiledICHolderOop is a helper object for the inline cache implementation. 26 // It holds an intermediate value (method+klass pair) used when converting from 27 // compiled to an interpreted call. 28 // 29 // compiledICHolderOops are always allocated permanent (to avoid traversing the 30 // codeCache during scavenge). 31 32 33 class compiledICHolderOopDesc : public oopDesc { 34 friend class VMStructs; 35 private: 36 methodOop _holder_method; 37 klassOop _holder_klass; // to avoid name conflict with oopDesc::_klass 38 public: 39 // accessors 40 methodOop holder_method() const { return _holder_method; } 41 klassOop holder_klass() const { return _holder_klass; } 42 43 void set_holder_method(methodOop m) { oop_store_without_check((oop*)&_holder_method, (oop)m); } 44 void set_holder_klass(klassOop k) { oop_store_without_check((oop*)&_holder_klass, (oop)k); } 45 46 static int header_size() { return sizeof(compiledICHolderOopDesc)/HeapWordSize; } 47 static int object_size() { return align_object_size(header_size()); } 48 49 // interpreter support (offsets in bytes) 50 static int holder_method_offset() { return offset_of(compiledICHolderOopDesc, _holder_method); } 51 static int holder_klass_offset() { return offset_of(compiledICHolderOopDesc, _holder_klass); } 52 53 // GC support 54 oop* adr_holder_method() const { return (oop*)&_holder_method; } 55 oop* adr_holder_klass() const { return (oop*)&_holder_klass; } 56 };