1 /*
   2  * Copyright 2000-2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.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.runtime.*;
  29 import sun.jvm.hotspot.utilities.*;
  30 
  31 public class SPARCRegister extends Register {
  32   private static final int nofRegisters = 32;  // total number of registers
  33 
  34   private static final int GLOBAL_BASE = 0;
  35   private static final int OUT_BASE    = 8;
  36   private static final int LOCAL_BASE  = 16;
  37   private static final int IN_BASE     = 24;
  38 
  39   private static final int LOCAL_SP_WORD_OFFSET = 0;
  40   private static final int IN_SP_WORD_OFFSET    = 8;
  41 
  42   /** Constructor for an explicitly numbered register */
  43   public SPARCRegister(int number) {
  44     super(number);
  45   }
  46 
  47   /** Constructor for an I, G, O, or L register */
  48   public SPARCRegister(SPARCRegisterType type, int number) {
  49     if (type == SPARCRegisterType.GLOBAL) {
  50       this.number = number + GLOBAL_BASE;
  51     } else if (type == SPARCRegisterType.OUT) {
  52       this.number = number + OUT_BASE;
  53     } else if (type == SPARCRegisterType.LOCAL) {
  54       this.number = number + LOCAL_BASE;
  55     } else if (type == SPARCRegisterType.IN) {
  56       this.number = number + IN_BASE;
  57     } else {
  58       throw new IllegalArgumentException("Invalid SPARC register type");
  59     }
  60   }
  61 
  62   public int getNumberOfRegisters() {
  63     return nofRegisters;
  64   }
  65 
  66   public boolean isIn() {
  67     return (IN_BASE <= getNumber());
  68   }
  69 
  70   public boolean isLocal() {
  71     return (LOCAL_BASE <= getNumber() && getNumber() < IN_BASE);
  72   }
  73 
  74   public boolean isOut() {
  75     return (OUT_BASE <= getNumber() && getNumber() < LOCAL_BASE);
  76   }
  77 
  78   public boolean isGlobal() {
  79     return (GLOBAL_BASE <= getNumber() && getNumber() < OUT_BASE);
  80   }
  81 
  82   public SPARCRegister afterSave() {
  83     if (Assert.ASSERTS_ENABLED) {
  84       Assert.that(isOut() || isGlobal(), "register not visible after save");
  85     }
  86     return isOut() ? new SPARCRegister(getNumber() + (IN_BASE - OUT_BASE)) : this;
  87   }
  88 
  89   public SPARCRegister afterRestore() {
  90     if (Assert.ASSERTS_ENABLED) {
  91       Assert.that(isIn() || isGlobal(), "register not visible after save");
  92     }
  93     return isIn() ? new SPARCRegister(getNumber() + (OUT_BASE - IN_BASE)) : this;
  94   }
  95 
  96   /** NOTE: this returns an offset in BYTES in this system! */
  97   public long spOffsetInSavedWindow() {
  98     if (isIn()) {
  99       return VM.getVM().getAddressSize() * (getNumber() - IN_BASE + IN_SP_WORD_OFFSET);
 100     } else if (isLocal()) {
 101       return VM.getVM().getAddressSize() * (getNumber() - LOCAL_BASE + LOCAL_SP_WORD_OFFSET);
 102     }
 103     if (Assert.ASSERTS_ENABLED) {
 104       Assert.that(isIn() || isLocal(), "only ins and locals are saved in my frame");
 105     }
 106     return 0;
 107   }
 108 
 109   public String toString() {
 110     return SPARCRegisters.getRegisterName(number);
 111   }
 112 
 113   public boolean isFramePointer() {
 114     return number == 30; // is I6?
 115   }
 116 
 117   public boolean isStackPointer() {
 118     return number == 14; // is O6?
 119   }
 120 
 121   public boolean isFloat() {
 122     return false;
 123   }
 124 
 125   public boolean isV9Only() {
 126     return false;
 127   }
 128 }