1 /*
   2  * Copyright (c) 2000, 2001, 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,
  20  * CA 94065 USA or visit www.oracle.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.asm.sparc;
  26 
  27 import sun.jvm.hotspot.asm.*;
  28 import sun.jvm.hotspot.utilities.*;
  29 
  30 /** SPARCArgument is an abstraction used to represent an outgoing
  31     actual argument or an incoming formal parameter, whether it
  32     resides in memory or in a register, in a manner consistent with
  33     the SPARC Application Binary Interface, or ABI.  This is often
  34     referred to as the native or C calling convention. */
  35 
  36 public class SPARCArgument {
  37   private int     number;
  38   private boolean isIn;
  39 
  40   // FIXME: add 64-bit stuff here (support for FP registers)
  41 
  42   /** Only 6 registers may contain integer parameters */
  43   public static final int NUM_REGISTER_PARAMETERS = 6;
  44 
  45   public SPARCArgument(int number, boolean isIn) {
  46     this.number = number;
  47     this.isIn   = isIn;
  48   }
  49 
  50   int     getNumber() { return number;     }
  51   boolean getIsIn()   { return isIn;       }
  52   boolean getIsOut()  { return !getIsIn(); }
  53 
  54   public SPARCArgument getSuccessor() { return new SPARCArgument(getNumber() + 1, getIsIn()); }
  55   public SPARCArgument asIn()         { return new SPARCArgument(getNumber(),     true);      }
  56   public SPARCArgument asOut()        { return new SPARCArgument(getNumber(),     false);     }
  57 
  58   /** Locating register-based arguments */
  59   public boolean isRegister()         { return number < NUM_REGISTER_PARAMETERS; }
  60 
  61   public SPARCRegister asRegister() {
  62     if (Assert.ASSERTS_ENABLED) {
  63       Assert.that(isRegister(), "must be a register argument");
  64     }
  65     return new SPARCRegister(getIsIn() ? SPARCRegisterType.IN : SPARCRegisterType.OUT, getNumber());
  66   }
  67 
  68   // locating memory-based arguments (FIXME: elided for now, will
  69   // necessitate creating new SPARCAddress class)
  70   //  public SPARCAddress asAddress() {
  71   //    if (Assert.ASSERTS_ENABLED) {
  72   //      Assert.that(!isRegister(), "must be a memory argument");
  73   //    }
  74   //    return addressInFrame();
  75   //  }
  76   //
  77   //  /** When applied to a register-based argument, give the corresponding address
  78   //      into the 6-word area "into which callee may store register arguments"
  79   //      (This is a different place than the corresponding register-save area location.)  */
  80   //  public SPARCAddress addressInFrame() const {
  81   //    return SPARCAddress( is_in()   ? Address::extra_in_argument
  82   //                          : Address::extra_out_argument,
  83   //                _number );
  84   //  }
  85 }