Package mars.assembler

Class DataTypes

java.lang.Object
mars.assembler.DataTypes
public final class DataTypes extends Object
Information about MIPS data types.
Version:
August 2003
Author:
Pete Sanderson

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static int
    BYTE_SIZE
    Number of bytes occupied by MIPS byte is 1.
    static int
    CHAR_SIZE
    Number of bytes occupied by MIPS character is 1.
    static int
    DOUBLE_SIZE
    Number of bytes occupied by MIPS double is 8.
    static int
    FLOAT_SIZE
    Number of bytes occupied by MIPS float is 4.
    static int
    HALF_SIZE
    Number of bytes occupied by MIPS halfword is 2.
    static double
    LOW_DOUBLE_VALUE
    Largest magnitude negative value that can be stored in a MIPS double(negative of the max)
    static double
    LOW_FLOAT_VALUE
    Largest magnitude negative value that can be stored in a MIPS float (negative of the max)
    static int
    MAX_BYTE_VALUE
    Maximum value that can be stored in a MIPS byte is 27-1
    static double
    MAX_DOUBLE_VALUE
    Maximum positive finite value that can be stored in a MIPS double is same as Java Double
    static double
    MAX_FLOAT_VALUE
    Maximum positive finite value that can be stored in a MIPS float is same as Java Float
    static int
    MAX_HALF_VALUE
    Maximum value that can be stored in a MIPS halfword is 215-1
    static int
    MAX_UHALF_VALUE
    Maximum value that can be stored in an unsigned MIPS halfword is 216-1
    static int
    MAX_WORD_VALUE
    Maximum value that can be stored in a MIPS word is 231-1
    static int
    MIN_BYTE_VALUE
    Lowest value that can be stored in a MIPS byte is -27
    static int
    MIN_HALF_VALUE
    Lowest value that can be stored in a MIPS halfword is -215
    static int
    MIN_UHALF_VALUE
    Lowest value that can be stored in na unsigned MIPS halfword is 0
    static int
    MIN_WORD_VALUE
    Lowest value that can be stored in a MIPS word is -231
    static int
    WORD_SIZE
    Number of bytes occupied by MIPS word is 4.

  • Constructor Summary

    Constructors
    Constructor
    Description
    DataTypes()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    getLengthInBytes​(Directives direct)
    Get length in bytes for numeric MIPS directives.
    static boolean
    outOfRange​(Directives direct, double value)
    Determines whether given floating point value falls within value range for given directive.
    static boolean
    outOfRange​(Directives direct, int value)
    Determines whether given integer value falls within value range for given directive.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • DOUBLE_SIZE

      public static final int DOUBLE_SIZE
      Number of bytes occupied by MIPS double is 8.
      See Also:
      Constant Field Values

    • FLOAT_SIZE

      public static final int FLOAT_SIZE
      Number of bytes occupied by MIPS float is 4.
      See Also:
      Constant Field Values

    • WORD_SIZE

      public static final int WORD_SIZE
      Number of bytes occupied by MIPS word is 4.
      See Also:
      Constant Field Values

    • HALF_SIZE

      public static final int HALF_SIZE
      Number of bytes occupied by MIPS halfword is 2.
      See Also:
      Constant Field Values

    • BYTE_SIZE

      public static final int BYTE_SIZE
      Number of bytes occupied by MIPS byte is 1.
      See Also:
      Constant Field Values

    • CHAR_SIZE

      public static final int CHAR_SIZE
      Number of bytes occupied by MIPS character is 1.
      See Also:
      Constant Field Values

    • MAX_WORD_VALUE

      public static final int MAX_WORD_VALUE
      Maximum value that can be stored in a MIPS word is 231-1
      See Also:
      Constant Field Values

    • MIN_WORD_VALUE

      public static final int MIN_WORD_VALUE
      Lowest value that can be stored in a MIPS word is -231
      See Also:
      Constant Field Values

    • MAX_HALF_VALUE

      public static final int MAX_HALF_VALUE
      Maximum value that can be stored in a MIPS halfword is 215-1
      See Also:
      Constant Field Values

    • MIN_HALF_VALUE

      public static final int MIN_HALF_VALUE
      Lowest value that can be stored in a MIPS halfword is -215
      See Also:
      Constant Field Values

    • MAX_UHALF_VALUE

      public static final int MAX_UHALF_VALUE
      Maximum value that can be stored in an unsigned MIPS halfword is 216-1
      See Also:
      Constant Field Values

    • MIN_UHALF_VALUE

      public static final int MIN_UHALF_VALUE
      Lowest value that can be stored in na unsigned MIPS halfword is 0
      See Also:
      Constant Field Values

    • MAX_BYTE_VALUE

      public static final int MAX_BYTE_VALUE
      Maximum value that can be stored in a MIPS byte is 27-1
      See Also:
      Constant Field Values

    • MIN_BYTE_VALUE

      public static final int MIN_BYTE_VALUE
      Lowest value that can be stored in a MIPS byte is -27
      See Also:
      Constant Field Values

    • MAX_FLOAT_VALUE

      public static final double MAX_FLOAT_VALUE
      Maximum positive finite value that can be stored in a MIPS float is same as Java Float
      See Also:
      Constant Field Values

    • LOW_FLOAT_VALUE

      public static final double LOW_FLOAT_VALUE
      Largest magnitude negative value that can be stored in a MIPS float (negative of the max)
      See Also:
      Constant Field Values

    • MAX_DOUBLE_VALUE

      public static final double MAX_DOUBLE_VALUE
      Maximum positive finite value that can be stored in a MIPS double is same as Java Double
      See Also:
      Constant Field Values

    • LOW_DOUBLE_VALUE

      public static final double LOW_DOUBLE_VALUE
      Largest magnitude negative value that can be stored in a MIPS double(negative of the max)
      See Also:
      Constant Field Values

  • Constructor Details

    • DataTypes

      public DataTypes()

  • Method Details

    • getLengthInBytes

      public static int getLengthInBytes​(Directives direct)
      Get length in bytes for numeric MIPS directives.
      Parameters:
      direct - Directive to be measured.
      Returns:
      Returns length in bytes for values of that type. If type is not numeric (or not implemented yet), returns 0.

    • outOfRange

      public static boolean outOfRange​(Directives direct, int value)
      Determines whether given integer value falls within value range for given directive.
      Parameters:
      direct - Directive that controls storage allocation for value.
      value - The value to be stored.
      Returns:
      Returns true if value can be stored in the number of bytes allowed by the given directive (.word, .half, .byte), false otherwise.

    • outOfRange

      public static boolean outOfRange​(Directives direct, double value)
      Determines whether given floating point value falls within value range for given directive. For float, this refers to range of the data type, not precision. Example: 1.23456789012345 be stored in a float with loss of precision. It's within the range. But 1.23e500 cannot be stored in a float because the exponent 500 is too large (float allows 8 bits for exponent).
      Parameters:
      direct - Directive that controls storage allocation for value.
      value - The value to be stored.
      Returns:
      Returns true if value is within range of the given directive (.float, .double), false otherwise.