scale.clef.expr
Class SelectOp

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

All Implemented Interfaces:

AnnotationInterface, DisplayNode

public class SelectOp
extends AggregateOp

A class which represents value of the "." and "->" operators in C.

$Id: SelectOp.java,v 1.29 2007-06-05 14:15:24 burrill Exp $

Copyright 2007 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

The selection operation represents the value of the operation. The right argument is the address of the structure and the left argument is the field.

Constructor Summary

SelectOp(Expression struct, FieldDecl fd)

Method Summary

void	visit(Predicate p) Process a node by calling its associated routine.

Methods inherited from class scale.clef.expr.AggregateOp

getChild, getField, getStruct, numChildren

Methods inherited from class scale.clef.expr.MonadicOp

containsDeclaration, equivalent, getDeclList, getExpr, isSimpleOp, setExpr

Methods inherited from class scale.clef.expr.Expression

canonical, getConstantValue, getCoreType, getDisplayColorHint, getDisplayLabel, getDisplayShapeHint, getPointedToCore, getType, hasTrueFalseResult, setType, toStringSpecial

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

SelectOp

public SelectOp(Expression struct,
                FieldDecl fd)

Method Detail

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 AggregateOp

See Also:

Predicate