org.eclipse.linuxtools.ctf.core/src/org/eclipse/linuxtools/ctf/core/event/types/FloatDefinition.java

   1 /*******************************************************************************
   2  * Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal and others
   3  *
   4  * All rights reserved. This program and the accompanying materials are made
   5  * available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors: Matthew Khouzam - Initial API and implementation
  10  *******************************************************************************/
  11
  12 package org.eclipse.linuxtools.ctf.core.event.types;
  13
  14 import org.eclipse.linuxtools.internal.ctf.core.event.io.BitBuffer;
  15
  16 public class FloatDefinition extends Definition {
  17     // ------------------------------------------------------------------------
  18     // Attributes
  19     // ------------------------------------------------------------------------
  20
  21     private final FloatDeclaration declaration;
  22     private double value;
  23
  24     // ------------------------------------------------------------------------
  25     // Contructors
  26     // ------------------------------------------------------------------------
  27
  28     public FloatDefinition(FloatDeclaration declaration,
  29             IDefinitionScope definitionScope, String fieldName) {
  30         super(definitionScope, fieldName);
  31         this.declaration = declaration;
  32     }
  33     // ------------------------------------------------------------------------
  34     // Gettters/Setters/Predicates
  35     // ------------------------------------------------------------------------
  36
  37     public double getValue() {
  38         return value;
  39     }
  40
  41     public void setValue(double val) {
  42         value = val;
  43     }
  44
  45     public FloatDeclaration getDeclaration() {
  46         return declaration;
  47     }
  48
  49     // ------------------------------------------------------------------------
  50     // Operations
  51     // ------------------------------------------------------------------------
  52
  53
  54
  55     @Override
  56     public void read(BitBuffer input) {
  57         int exp = declaration.getExponent();
  58         int mant = declaration.getMantissa();
  59         if( (exp + mant) == 32 ){
  60             readRawFloat32(input, mant , exp);
  61         }
  62         else if((exp + mant) == 64)
  63         {
  64             readRawFloat64(input, mant,exp);
  65         }
  66         else
  67         {
  68             value = Double.NaN;
  69         }
  70     }
  71
  72
  73
  74     private void readRawFloat64(BitBuffer input, final int manBits, final int expBits) {
  75        long low = input.getInt(32, false);
  76        low = low & 0x00000000FFFFFFFFL;
  77        long high = input.getInt(32, false);
  78        high = high & 0x00000000FFFFFFFFL;
  79        long temp = (high << 32) | low;
  80
  81
  82        value = createFloat(temp, manBits, expBits);
  83     }
  84
  85     /**
  86      * @param rawValue
  87      * @param manBits
  88      * @param expBits
  89      */
  90     private static double createFloat(long rawValue, final int manBits, final int expBits) {
  91         long manShift = 1L << manBits;
  92            long manMask = manShift -1;
  93            long expMask = (1L << expBits) -1;
  94
  95            int exp =(int)( rawValue >> manBits);
  96            long man  = (rawValue & manMask);
  97            double expPow = Math.pow(2.0, exp-(1 << (expBits-1)));
  98            double ret = man * 1.0f;
  99            ret /= manShift;
 100            ret += 1.0;
 101            ret *= expPow;
 102            return ret;
 103     }
 104
 105     private void readRawFloat32(BitBuffer input, final int manBits,
 106     final int expBits) {
 107         long temp = input.getInt(32, false);
 108
 109         value = createFloat(temp, manBits, expBits);
 110     }
 111
 112     @Override
 113     public String toString() {
 114         return String.valueOf(value);
 115     }
 116 }