001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.osr.ia32;
014    
015    import org.jikesrvm.VM;
016    import org.jikesrvm.ia32.ArchConstants;
017    import org.jikesrvm.ia32.Registers;
018    import org.vmmagic.unboxed.Address;
019    import org.vmmagic.unboxed.WordArray;
020    
021    /**
022     * Temporary register set.
023     * see: Registers
024     */
025    public class TempRegisters implements ArchConstants {
026    
027      final Address ip;        // next instruction address
028      final WordArray gprs;
029      final double[] fprs;
030    
031      /**
032       * if a GPR hold a reference to an object, we convert the raw memory
033       * address to a reference. When objs[i] is null, the GPR[i] is not
034       * holding a reference.
035       */
036      final Object[] objs;
037    
038      public TempRegisters(Registers contextRegisters) {
039        gprs = WordArray.create(NUM_GPRS);
040        fprs = new double[NUM_FPRS];
041        objs = new Object[NUM_GPRS];
042    
043        for (int i = 0; i < NUM_GPRS; i++) {
044          gprs.set(i, contextRegisters.gprs.get(i));
045        }
046        System.arraycopy(contextRegisters.fprs, 0, fprs, 0, NUM_FPRS);
047        ip = contextRegisters.ip;
048      }
049    
050      public void dumpContents() {
051        System.err.println("OSR_TempRegister: @" + VM.addressAsHexString(ip));
052        System.err.println("  GPRS: ");
053        for (int i = 0; i < NUM_GPRS; i++) {
054          System.err.println("    (" + i + "," + VM.addressAsHexString(gprs.get(i).toAddress()) + ")");
055        }
056    
057        System.err.println();
058        System.err.println("  OBJS: ");
059        for (int i = 0; i < NUM_GPRS; i++) {
060          if (objs[i] != null) {
061            System.err.println("    (" + i + "," + objs[i] + ")");
062          }
063        }
064    
065        System.err.println();
066        System.err.println("  FPRS  ");
067        for (int i = 0; i < NUM_FPRS; i++) {
068          System.err.println("    (" + i + "," + fprs[i] + ")");
069        }
070      }
071    }