1 /*
   2  * Copyright (c) 1997, 2010, 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 CPU_X86_VM_INTERPRETER_X86_HPP
  26 #define CPU_X86_VM_INTERPRETER_X86_HPP
  27 
  28  public:
  29 
  30   // Sentinel placed in the code for interpreter returns so
  31   // that i2c adapters and osr code can recognize an interpreter
  32   // return address and convert the return to a specialized
  33   // block of code to handle compiedl return values and cleaning
  34   // the fpu stack.
  35   static const int return_sentinel;
  36 
  37   static Address::ScaleFactor stackElementScale() { return Address::times_4; }
  38 
  39   // Offset from rsp (which points to the last stack element)
  40   static int expr_offset_in_bytes(int i) { return stackElementSize * i; }
  41 
  42   // Stack index relative to tos (which points at value)
  43   static int expr_index_at(int i)        { return stackElementWords * i; }
  44 
  45   // Already negated by c++ interpreter
  46   static int local_index_at(int i) {
  47     assert(i <= 0, "local direction already negated");
  48     return stackElementWords * i;
  49   }
  50 
  51 #endif // CPU_X86_VM_INTERPRETER_X86_HPP