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Java example source code file (SPARCRegister.java)

This example Java source code file (SPARCRegister.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

global_base, illegalargumentexception, in_base, in_sp_word_offset, invalid, local_base, local_sp_word_offset, out_base, sparcregister, string

The SPARCRegister.java Java example source code

/*
 * Copyright (c) 2000, 2002, 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.runtime.*;
import sun.jvm.hotspot.utilities.*;

public class SPARCRegister extends Register {
  private static final int nofRegisters = 32;  // total number of registers

  private static final int GLOBAL_BASE = 0;
  private static final int OUT_BASE    = 8;
  private static final int LOCAL_BASE  = 16;
  private static final int IN_BASE     = 24;

  private static final int LOCAL_SP_WORD_OFFSET = 0;
  private static final int IN_SP_WORD_OFFSET    = 8;

  /** Constructor for an explicitly numbered register */
  public SPARCRegister(int number) {
    super(number);
  }

  /** Constructor for an I, G, O, or L register */
  public SPARCRegister(SPARCRegisterType type, int number) {
    if (type == SPARCRegisterType.GLOBAL) {
      this.number = number + GLOBAL_BASE;
    } else if (type == SPARCRegisterType.OUT) {
      this.number = number + OUT_BASE;
    } else if (type == SPARCRegisterType.LOCAL) {
      this.number = number + LOCAL_BASE;
    } else if (type == SPARCRegisterType.IN) {
      this.number = number + IN_BASE;
    } else {
      throw new IllegalArgumentException("Invalid SPARC register type");
    }
  }

  public int getNumberOfRegisters() {
    return nofRegisters;
  }

  public boolean isIn() {
    return (IN_BASE <= getNumber());
  }

  public boolean isLocal() {
    return (LOCAL_BASE <= getNumber() && getNumber() < IN_BASE);
  }

  public boolean isOut() {
    return (OUT_BASE <= getNumber() && getNumber() < LOCAL_BASE);
  }

  public boolean isGlobal() {
    return (GLOBAL_BASE <= getNumber() && getNumber() < OUT_BASE);
  }

  public SPARCRegister afterSave() {
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(isOut() || isGlobal(), "register not visible after save");
    }
    return isOut() ? new SPARCRegister(getNumber() + (IN_BASE - OUT_BASE)) : this;
  }

  public SPARCRegister afterRestore() {
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(isIn() || isGlobal(), "register not visible after save");
    }
    return isIn() ? new SPARCRegister(getNumber() + (OUT_BASE - IN_BASE)) : this;
  }

  /** NOTE: this returns an offset in BYTES in this system! */
  public long spOffsetInSavedWindow() {
    if (isIn()) {
      return VM.getVM().getAddressSize() * (getNumber() - IN_BASE + IN_SP_WORD_OFFSET);
    } else if (isLocal()) {
      return VM.getVM().getAddressSize() * (getNumber() - LOCAL_BASE + LOCAL_SP_WORD_OFFSET);
    }
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(isIn() || isLocal(), "only ins and locals are saved in my frame");
    }
    return 0;
  }

  public String toString() {
    return SPARCRegisters.getRegisterName(number);
  }

  public boolean isFramePointer() {
    return number == 30; // is I6?
  }

  public boolean isStackPointer() {
    return number == 14; // is O6?
  }

  public boolean isFloat() {
    return false;
  }

  public boolean isV9Only() {
    return false;
  }
}

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