Package gnu.jel

Class OPbinary

  • public class OPbinary
extends OP
    A tree node, representing binary operation.

    • Constructor Summary

      Constructors 
      Constructor Description
      OPbinary​(java.util.Stack<OP> paramOPs, int opcode)
      Constructs a new binary operation.

    • Field Detail

      • code

        public int code
        code of this operation

      • promotions

        protected static final byte[][] promotions
        binary promotions of base types

    • Constructor Detail

      • OPbinary

        public OPbinary​(java.util.Stack<OP> paramOPs,
                int opcode)
         throws CompilationException
        Constructs a new binary operation.

        Codes are following: 

         0   --  addition
 1   --  substraction
 2   --  multiplication
 3   --  division
 4   --  remainder
 5   --  bitwise AND
 6   --  bitwise OR
 7   --  bitwise and logical XOR
 8   --  comparizon for equality
 9   --  comparizon for non-equality
 10  --  comparizon for "less" <
 11  --  comparizon for "greater or equal" >=
 12  --  comparizon for "greater" >
 13  --  comparizon for "less or equal" <=
 14  --  bitwise left shift <<
 15  --  bitwise right signed shift >>
 16  --  bitwise right unsigned shift >>>
 17  --  logical conjunction operator (AND)
 18  --  logical disjunction operator (OR)
 19  --  array element access operation
 20  --  reserved (used internally for string concatenation)
        Parameters:
        paramOPs - stack holding the operands
        opcode - is the operation code
        Throws:
        CompilationException

    • Method Detail

      • compile

        public void compile​(ClassFile cf)
        Description copied from class: OP
        Called to generate the code implementing this OP.
        Specified by:
        compile in class OP
        Parameters:
        cf - class file with a new open method to write the code into.

      • eval

        public java.lang.Object eval()
                      throws java.lang.Exception
        Description copied from class: OP
        Called to evaluate this node and all its sub-nodes.

        Upon success this node is to be replaced by the constant node holding the returned object.

        Specified by:
        eval in class OP
        Returns:
        an object to which this node evaluates
        Throws:
        java.lang.Exception