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Java example source code file (SPARCArgument.java)

This example Java source code file (SPARCArgument.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

num_register_parameters, sparcargument, sparcregister

The SPARCArgument.java Java example source code

/*
 * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.asm.sparc;

import sun.jvm.hotspot.asm.*;
import sun.jvm.hotspot.utilities.*;

/** SPARCArgument is an abstraction used to represent an outgoing
    actual argument or an incoming formal parameter, whether it
    resides in memory or in a register, in a manner consistent with
    the SPARC Application Binary Interface, or ABI.  This is often
    referred to as the native or C calling convention. */

public class SPARCArgument {
  private int     number;
  private boolean isIn;

  // FIXME: add 64-bit stuff here (support for FP registers)

  /** Only 6 registers may contain integer parameters */
  public static final int NUM_REGISTER_PARAMETERS = 6;

  public SPARCArgument(int number, boolean isIn) {
    this.number = number;
    this.isIn   = isIn;
  }

  int     getNumber() { return number;     }
  boolean getIsIn()   { return isIn;       }
  boolean getIsOut()  { return !getIsIn(); }

  public SPARCArgument getSuccessor() { return new SPARCArgument(getNumber() + 1, getIsIn()); }
  public SPARCArgument asIn()         { return new SPARCArgument(getNumber(),     true);      }
  public SPARCArgument asOut()        { return new SPARCArgument(getNumber(),     false);     }

  /** Locating register-based arguments */
  public boolean isRegister()         { return number < NUM_REGISTER_PARAMETERS; }

  public SPARCRegister asRegister() {
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(isRegister(), "must be a register argument");
    }
    return new SPARCRegister(getIsIn() ? SPARCRegisterType.IN : SPARCRegisterType.OUT, getNumber());
  }

  // locating memory-based arguments (FIXME: elided for now, will
  // necessitate creating new SPARCAddress class)
  //  public SPARCAddress asAddress() {
  //    if (Assert.ASSERTS_ENABLED) {
  //      Assert.that(!isRegister(), "must be a memory argument");
  //    }
  //    return addressInFrame();
  //  }
  //
  //  /** When applied to a register-based argument, give the corresponding address
  //      into the 6-word area "into which callee may store register arguments"
  //      (This is a different place than the corresponding register-save area location.)  */
  //  public SPARCAddress addressInFrame() const {
  //    return SPARCAddress( is_in()   ? Address::extra_in_argument
  //                          : Address::extra_out_argument,
  //                _number );
  //  }
}

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