duke@435: /*
duke@435:  * Copyright 1997-2007 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:  public:
duke@435: 
duke@435:   // Sentinel placed in the code for interpreter returns so
duke@435:   // that i2c adapters and osr code can recognize an interpreter
duke@435:   // return address and convert the return to a specialized
duke@435:   // block of code to handle compiedl return values and cleaning
duke@435:   // the fpu stack.
duke@435:   static const int return_sentinel;
duke@435: 
duke@435: 
duke@435:   static Address::ScaleFactor stackElementScale() {
duke@435:     return TaggedStackInterpreter? Address::times_8 : Address::times_4;
duke@435:   }
duke@435: 
duke@435:   // Offset from rsp (which points to the last stack element)
duke@435:   static int expr_offset_in_bytes(int i) { return stackElementSize()*i ; }
duke@435:   static int expr_tag_offset_in_bytes(int i) {
duke@435:     assert(TaggedStackInterpreter, "should not call this");
duke@435:     return expr_offset_in_bytes(i) + wordSize;
duke@435:   }
duke@435: 
duke@435:   // Support for Tagged Stacks
duke@435: 
duke@435:   // Stack index relative to tos (which points at value)
duke@435:   static int expr_index_at(int i)     {
duke@435:     return stackElementWords() * i;
duke@435:   }
duke@435: 
duke@435:   static int expr_tag_index_at(int i) {
duke@435:     assert(TaggedStackInterpreter, "should not call this");
duke@435:     // tag is one word above java stack element
duke@435:     return stackElementWords() * i + 1;
duke@435:   }
duke@435: 
duke@435:   // Already negated by c++ interpreter
duke@435:   static int local_index_at(int i)     {
duke@435:     assert(i<=0, "local direction already negated");
duke@435:     return stackElementWords() * i + (value_offset_in_bytes()/wordSize);
duke@435:   }
duke@435: 
duke@435:   static int local_tag_index_at(int i) {
duke@435:     assert(i<=0, "local direction already negated");
duke@435:     assert(TaggedStackInterpreter, "should not call this");
duke@435:     return stackElementWords() * i + (tag_offset_in_bytes()/wordSize);
duke@435:   }