scale.clef.expr
Class TranscendentalOp

java.lang.Object
  scale.common.Root
      scale.clef.Node
          scale.clef.expr.Expression
              scale.clef.expr.MonadicOp
                  scale.clef.expr.TranscendentalOp

All Implemented Interfaces:

AnnotationInterface, DisplayNode

public class TranscendentalOp
extends MonadicOp

This class represents the monadic intrinsic functions.

$Id: TranscendentalOp.java,v 1.20 2007-03-21 13:31:54 burrill Exp $

Copyright 2008 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

If would have been better to name this class the BuiltInOperation class. It represents those complex operations which it may be possible to implement on the target architecture with a simple sequence of instructions. An example is the square root function which some architectures provide as a single instruction.

Constructor Summary

TranscendentalOp(Type type, Expression e, TransFtn ftn)

Method Summary

Literal	getConstantValue() Return the constant value of the expression.
java.lang.String	getDisplayLabel() Return a String suitable for labeling this node in a graphical display.
TransFtn	getFtn() Return a value indicating the transcendental function represented.
java.lang.String	toStringSpecial() This method allows sub-classes to provide class specific stuff to the string.
void	visit(Predicate p) Process a node by calling its associated routine.

Methods inherited from class scale.clef.expr.MonadicOp

containsDeclaration, equivalent, getChild, getDeclList, getExpr, isSimpleOp, numChildren, setExpr

Methods inherited from class scale.clef.expr.Expression

canonical, getCoreType, getDisplayColorHint, getDisplayShapeHint, getPointedToCore, getType, hasTrueFalseResult, setType

Methods inherited from class scale.clef.Node

getDecl, getSourceLineNumber, setAnnotationLevel, setReportLevel, setSourceLineNumber, toString, toString, toStringChildren

Methods inherited from class scale.common.Root

addAnnotation, allAnnotations, allMatchingAnnotations, getAnnotation, getDisplayName, getDisplayString, getNodeCount, getNodeID, hasAnnotation, hasEqualAnnotation, hashCode, removeAnnotation, removeAnnotations, toStringAnnotations, toStringClass, trace, trace, trace

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TranscendentalOp

public TranscendentalOp(Type type,
                        Expression e,
                        TransFtn ftn)

Method Detail

getFtn

public TransFtn getFtn()

Return a value indicating the transcendental function represented.

getDisplayLabel

public java.lang.String getDisplayLabel()

Description copied from class: Expression

Return a String suitable for labeling this node in a graphical display. This method should be over-ridden as it simplay returns the class name.

Specified by:

getDisplayLabel in interface DisplayNode

Overrides:

getDisplayLabel in class Expression

Returns:

short description of current node.

visit

public void visit(Predicate p)

Description copied from class: Node

Process a node by calling its associated routine. See the "visitor" design pattern in Design Patterns: Elements of Reusable Object-Oriented Software by E. Gamma, et al, Addison Wesley, ISBN 0-201-63361-2.

Each class has a visit(Predicate p) method. For example, in class ABC:

   public void visit(Predicate p)
   {
     p.visitABC(this);
   }
 

and the class that implements Predicate has a method

   public void visitABC(Node n)
   {
     ABC a = (ABC) n;
     ...
   }
 

Thus, the class that implements Predicate can call

   n.visit(this);
 

where n is a Node sub-class without determining which specific sub-class n is. The visit pattern basically avoids implementing a large switch statement or defining different methods in each class for some purpose.

Overrides:

visit in class MonadicOp

See Also:

Predicate

getConstantValue

public Literal getConstantValue()

Return the constant value of the expression.

Overrides:

getConstantValue in class Expression

See Also:

Lattice

toStringSpecial

public java.lang.String toStringSpecial()

Description copied from class: Node

This method allows sub-classes to provide class specific stuff to the string.

Overrides:

toStringSpecial in class Expression