duke@435: /*
duke@435:  * Copyright 1998-2004 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // A compiledICHolderOop is a helper object for the inline cache implementation.
duke@435: // It holds an intermediate value (method+klass pair) used when converting from
duke@435: // compiled to an interpreted call.
duke@435: //
duke@435: // compiledICHolderOops are always allocated permanent (to avoid traversing the
duke@435: // codeCache during scavenge).
duke@435: 
duke@435: 
duke@435: class compiledICHolderOopDesc : public oopDesc {
duke@435:   friend class VMStructs;
duke@435:  private:
duke@435:   methodOop _holder_method;
duke@435:   klassOop  _holder_klass;    // to avoid name conflict with oopDesc::_klass
duke@435:  public:
duke@435:   // accessors
duke@435:   methodOop holder_method() const     { return _holder_method; }
duke@435:   klassOop  holder_klass()  const     { return _holder_klass; }
duke@435: 
duke@435:   void set_holder_method(methodOop m) { oop_store_without_check((oop*)&_holder_method, (oop)m); }
duke@435:   void set_holder_klass(klassOop k)   { oop_store_without_check((oop*)&_holder_klass, (oop)k); }
duke@435: 
duke@435:   static int header_size()            { return sizeof(compiledICHolderOopDesc)/HeapWordSize; }
duke@435:   static int object_size()            { return align_object_size(header_size()); }
duke@435: 
duke@435:   // interpreter support (offsets in bytes)
duke@435:   static int holder_method_offset()   { return offset_of(compiledICHolderOopDesc, _holder_method); }
duke@435:   static int holder_klass_offset()    { return offset_of(compiledICHolderOopDesc, _holder_klass); }
duke@435: 
duke@435:   // GC support
duke@435:   oop* adr_holder_method() const      { return (oop*)&_holder_method; }
duke@435:   oop* adr_holder_klass() const       { return (oop*)&_holder_klass; }
duke@435: };