harpoon.IR.Tree
Class Stm

java.lang.Object
  harpoon.IR.Tree.Tree
      harpoon.IR.Tree.Stm

All Implemented Interfaces:

HCodeElement

Direct Known Subclasses:

ALIGN, CJUMP, DATUM, EXPR, INVOCATION, JUMP, LABEL, METHOD, MOVE, RETURN, SEGMENT, SEQ, THROW

public abstract class Stm
extends Tree

Stm objects are statements which perform side effects and control flow.

Version:

$Id: Stm.java,v 1.3 2002/04/10 03:05:45 cananian Exp $

Author:

C. Scott Ananian <cananian@alumni.princeton.edu>, based on Modern Compiler Implementation in Java by Andrew Appel.

Nested Class Summary

Nested classes/interfaces inherited from class harpoon.IR.Tree.Tree

Tree.CloneCallback

Field Summary

Fields inherited from class harpoon.IR.Tree.Tree

arrayFactory, child

Constructor Summary

protected

Stm(TreeFactory tf, HCodeElement source, int arity)

Method Summary

Stm	build(ExpList kids) Build an Stm of this type from the given list of subexpressions.
abstract Stm	build(TreeFactory tf, ExpList kids)
static boolean	isNop(Stm stm) Returns true if stm has no effect.
static Stm	linearize(Stm stm) Returns a Stm such that all SEQ objects contained within the Stm object are on the top level.
static Stm	toStm(List<Stm> list) Returns a tree-based representation of list.

Methods inherited from class harpoon.IR.Tree.Tree

accept, clone, clone, getChild, getFactory, getFirstChild, getID, getLineNumber, getParent, getSibling, getSourceFile, hashCode, kids, kind, rename, rename, replace, setChild, unlink

Methods inherited from class java.lang.Object

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

Constructor Detail

Stm

protected Stm(TreeFactory tf,
              HCodeElement source,
              int arity)

Method Detail

build

public final Stm build(ExpList kids)

Build an Stm of this type from the given list of subexpressions.

build

public abstract Stm build(TreeFactory tf,
                          ExpList kids)

toStm

public static Stm toStm(List<Stm> list)

Returns a tree-based representation of list.
Requires: foreach element, l, of list, (l != null) && (l instanceof Stm).
Modifies:
Effects: returns a tree-based representation of list. If list is null, returns null.

linearize

public static Stm linearize(Stm stm)

Returns a Stm such that all SEQ objects contained within the Stm object are on the top level.

isNop

public static boolean isNop(Stm stm)

Returns true if stm has no effect.