scale.clef.expr
Class IncrementOp

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

All Implemented Interfaces:

AnnotationInterface, DisplayNode

Direct Known Subclasses:

PostDecrementOp, PostIncrementOp, PreDecrementOp, PreIncrementOp

public abstract class IncrementOp
extends MonadicOp

This is the base class for all modify and replace operations such as x++.

$Id: IncrementOp.java,v 1.23 2005-03-17 14:11:32 burrill Exp $

Copyright 2005 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

Constructor Summary

IncrementOp(Type type, Expression e)

Method Summary

boolean	isSimpleOp() Return true if compilation of this expression will not result in the generation of a CFG node.
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, numChildren, 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

IncrementOp

public IncrementOp(Type type,
                   Expression e)

Method Detail

isSimpleOp

public boolean isSimpleOp()

Description copied from class: Expression

Return true if compilation of this expression will not result in the generation of a CFG node. For example, (a && b) may require a branch to represent and i++ requires a store.

Overrides:

isSimpleOp in class MonadicOp

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