Package EDU.purdue.cs.bloat.tree

Class Expr

java.lang.Object

EDU.purdue.cs.bloat.tree.Node

EDU.purdue.cs.bloat.tree.Expr

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

ArithExpr, ArrayLengthExpr, CallExpr, CastExpr, CatchExpr, CheckExpr, CondExpr, ConstantExpr, DefExpr, NegExpr, NewArrayExpr, NewExpr, NewMultiArrayExpr, ReturnAddressExpr, ShiftExpr, StoreExpr

public abstract class Expr
extends Node
implements java.lang.Cloneable

Expr is the superclass for a number of other classes representing expressions in byte code. Expressions are typed and may be nested.

See Also:

DefExpr

Field Summary

Fields

Modifier and Type	Field	Description
protected Type	type

Fields inherited from class EDU.purdue.cs.bloat.tree.Node

parent

Constructor Summary

Constructors

Constructor	Description
Expr(Type type)	Constructor.

Method Summary

Modifier and Type	Method	Description
void	cleanupOnly()	Cleans up this expression only, not its children.
abstract java.lang.Object	clone()
java.lang.Object	comparator()	Returns an Object that can be used to compare other Expr to this.
protected Expr	copyInto(Expr expr)	Copies the contents of another expression in this one.
DefExpr	def()	Returns the expression in which this Expr is defined.
abstract boolean	equalsExpr(Expr other)	Compares this expression to another.
abstract int	exprHashCode()	Returns the hash code for this expresion.
boolean	isDef()	Returns whether or not this expression is a defining occurrence.
void	setDef(DefExpr def)	Sets the expression that defines this expression.
boolean	setType(Type type)	Sets the type of this expression.
Stmt	stmt()	Returns the statement to which this expression belongs.
Type	type()	Returns the Type of this expression.

Methods inherited from class EDU.purdue.cs.bloat.tree.Node

block, cleanup, copyInto, hasParent, key, parent, replaceWith, replaceWith, setKey, setParent, setValueNumber, toString, valueNumber, visit, visitChildren, visitForceChildren, visitOnly

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

type

protected Type type

Constructor Detail

Expr

public Expr(Type type)

Constructor. Initializes an expression with a given type.

Parameters:

type - The initial Type (descriptor) of this expression.

Method Detail

setType

public boolean setType(Type type)

Sets the type of this expression. Returns whether or not the type changed as a result of calling this method.

isDef

public boolean isDef()

Returns whether or not this expression is a defining occurrence. By default, false is returned.

stmt

public Stmt stmt()

Returns the statement to which this expression belongs. It essentially searches up the expression tree for this expression's first ancestor which is a Stmt.

type

public Type type()

Returns the Type of this expression.

cleanupOnly

public void cleanupOnly()

Cleans up this expression only, not its children.

Specified by:

cleanupOnly in class Node

setDef

public void setDef(DefExpr def)

Sets the expression that defines this expression.

Parameters:

def - Defining expression.

def

public DefExpr def()

Returns the expression in which this Expr is defined.

exprHashCode

public abstract int exprHashCode()

Returns the hash code for this expresion.

equalsExpr

public abstract boolean equalsExpr(Expr other)

Compares this expression to another.

Parameters:

other - Expr to which to compare this.

clone

public abstract java.lang.Object clone()

Overrides:

clone in class java.lang.Object

copyInto

protected Expr copyInto(Expr expr)

Copies the contents of another expression in this one.

Parameters:

expr - The expression from which to copy.

comparator

public java.lang.Object comparator()

Returns an Object that can be used to compare other Expr to this.