harpoon.IR.Quads
Class CONST

java.lang.Object
  harpoon.IR.Quads.Quad
      harpoon.IR.Quads.CONST

All Implemented Interfaces:

HCodeElement, CFGraphable<Quad,Edge>, UseDefable, Graph.Node<Quad,Edge>, Serializable, Cloneable, Comparable<Quad>

public class CONST
extends Quad

CONST objects represent an assignment of a constant value to a compiler temporary.

The type field of a CONST must be one of: Class, Field, Method, String, int, long, float, double or void. A void type corresponds to a null literal constant, and in this case the value field will be null. For class, field, and method constants, the value field will contain an instance of HClass, HField, or HMethod, respectively. In all other cases, value will contain an object of the specified type; values of primitive types will use the standard wrapper class. An example may clarify:

• The integer constant 0 is represented by
  new CONST(qf, hce, dst, new Integer(0), HClass.Int);
• The string constant "hello, world" is represented by
  new CONST(qf, hce, dst, "hello, world", linker.forName("java.lang.String") );
• The class constant that would be returned by Class.forName("java.lang.Object") is represented by
  new CONST(qf, hce, dst, linker.forName("java.lang.Object"), linker.forName("java.lang.Class") );
• The null literal is represented by
  new CONST(qf, hce, dst, null, HClass.Void);

Version:

$Id: CONST.java,v 1.5 2002/04/11 04:00:34 cananian Exp $

Author:

C. Scott Ananian <cananian@alumni.princeton.edu>

See Also:

Serialized Form

Field Summary

protected Temp	dst The destination Temp.
protected HClass	type The type of the constant value.
protected Object	value An object representing the constant value.

Fields inherited from class harpoon.IR.Quads.Quad

arrayFactory

Constructor Summary

CONST(QuadFactory qf, HCodeElement source, Temp dst, Object value, HClass type)
Creates a CONST from a destination temporary, and object value and its class type.

Method Summary

<T> T	accept(QuadValueVisitor<T> v)
void	accept(QuadVisitor v) Accept a visitor.
Temp[]	def() Returns the Temp defined by this Quad.
Temp	dst() Returns the Temp which will contain the specified constant value.
int	kind() Return an integer enumeration of the kind of this Quad.
Quad	rename(QuadFactory qqf, TempMap defMap, TempMap useMap) Create a new Quad identical to the receiver, but with all Temps renamed according to a mapping.
String	toString() Returns a human-readable representation of this Quad.
HClass	type() Returns the type of the constant value.
Object	value() Returns the object representing the constant value.

Methods inherited from class harpoon.IR.Quads.Quad

addEdge, addEdges, addHandlers, clone, clone, clone, compareTo, defC, edgeC, edges, getFactory, getID, getLineNumber, getSourceFile, handlers, hashCode, isPred, isSucc, map, map, map, next, next, nextEdge, nextEdge, nextLength, pred, predC, prev, prev, prevEdge, prevEdge, prevLength, remove, removeHandlers, rename, replace, succ, succC, toLongString, transferHandlers, use, useC

Methods inherited from class java.lang.Object

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

Field Detail

dst

protected Temp dst

The destination Temp.

value

protected final Object value

An object representing the constant value.

type

protected final HClass type

The type of the constant value.

Constructor Detail

CONST

public CONST(QuadFactory qf,
             HCodeElement source,
             Temp dst,
             Object value,
             HClass type)

Creates a CONST from a destination temporary, and object value and its class type.

Parameters:

dst - the Temp which will contain the specified constant value.

value - an object representing the constant value.

type - the type of the constant value.

Method Detail

dst

public Temp dst()

Returns the Temp which will contain the specified constant value.

value

public Object value()

Returns the object representing the constant value.

type

public HClass type()

Returns the type of the constant value.

def

public Temp[] def()

Returns the Temp defined by this Quad.

Specified by:

def in interface UseDefable

Overrides:

def in class Quad

Returns:

the dst field.

kind

public int kind()

Description copied from class: Quad

Return an integer enumeration of the kind of this Quad. The enumerated values are defined in QuadKind.

Specified by:

kind in class Quad

rename

public Quad rename(QuadFactory qqf,
                   TempMap defMap,
                   TempMap useMap)

Description copied from class: Quad

Create a new Quad identical to the receiver, but with all Temps renamed according to a mapping. The new Quad will have no edges.

The new Quad will come from the specified QuadFactory.

Specified by:

rename in class Quad

accept

public void accept(QuadVisitor v)

Description copied from class: Quad

Accept a visitor.

Specified by:

accept in class Quad

accept

public <T> T accept(QuadValueVisitor<T> v)

Specified by:

accept in class Quad

toString

public String toString()

Returns a human-readable representation of this Quad.

Specified by:

toString in class Quad