1 jwhaley 1.1.2.1 // EXPR.java, created Wed Jan 13 21:14:57 1999 by cananian
2 jwhaley 1.1.2.1 // Copyright (C) 1998 C. Scott Ananian <cananian@alumni.princeton.edu>
3 jwhaley 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 jwhaley 1.1.2.1 package harpoon.IR.Tree;
5 jwhaley 1.1.2.1
6 jwhaley 1.1.2.1 import harpoon.ClassFile.HCodeElement;
7 jwhaley 1.1.2.1 import harpoon.Temp.TempMap;
8 jwhaley 1.1.2.1 import harpoon.Util.Util;
9 jwhaley 1.1.2.1
10 jwhaley 1.1.2.1 /**
11 jwhaley 1.1.2.1 * <code>EXPR</code> objects evaluate an expression (for side-effects) and then
12 jwhaley 1.1.2.1 * throw away the result.
13 jwhaley 1.1.2.1 *
14 jwhaley 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>, based on
15 jwhaley 1.1.2.1 * <i>Modern Compiler Implementation in Java</i> by Andrew Appel.
16 cananian 1.4 * @version $Id: EXPR.java,v 1.4 2002/04/10 03:05:45 cananian Exp $
17 jwhaley 1.1.2.1 */
18 jwhaley 1.1.2.1 public class EXPR extends Stm {
19 jwhaley 1.1.2.1 /** Constructor. */
20 jwhaley 1.1.2.1 public EXPR(TreeFactory tf, HCodeElement source,
21 jwhaley 1.1.2.1 Exp exp) {
22 jwhaley 1.1.2.1 super(tf, source, 1);
23 cananian 1.3.2.1 assert exp!=null;
24 jwhaley 1.1.2.1 this.setExp(exp);
25 cananian 1.3.2.1 assert tf == exp.tf : "Dest and Src must have same tree factory";
26 jwhaley 1.1.2.1
27 jwhaley 1.1.2.1 // FSK: debugging hack
28 jwhaley 1.1.2.1 // this.accept(TreeVerifyingVisitor.norepeats());
29 jwhaley 1.1.2.1 }
30 jwhaley 1.1.2.1
31 jwhaley 1.1.2.1 /** Returns the expression to evaluate. */
32 jwhaley 1.1.2.1 public Exp getExp() { return (Exp) getChild(0); }
33 jwhaley 1.1.2.1
34 jwhaley 1.1.2.1 /** Sets the expression to evaluate. */
35 jwhaley 1.1.2.1 public void setExp(Exp exp) { setChild(0, exp); }
36 jwhaley 1.1.2.1
37 jwhaley 1.1.2.1 public int kind() { return TreeKind.EXPR; }
38 jwhaley 1.1.2.1
39 jwhaley 1.1.2.1 public Stm build(TreeFactory tf, ExpList kids) {
40 cananian 1.3.2.1 assert kids!=null && kids.tail==null;
41 cananian 1.3.2.1 assert tf == kids.head.tf;
42 jwhaley 1.1.2.1 return new EXPR(tf, this, kids.head);
43 jwhaley 1.1.2.1 }
44 jwhaley 1.1.2.1 /** Accept a visitor */
45 jwhaley 1.1.2.1 public void accept(TreeVisitor v) { v.visit(this); }
46 jwhaley 1.1.2.1
47 jwhaley 1.1.2.1 public Tree rename(TreeFactory tf, TempMap tm, CloneCallback cb) {
48 jwhaley 1.1.2.1 return cb.callback(this, new EXPR(tf, this, (Exp)getExp().rename(tf, tm, cb)), tm);
49 jwhaley 1.1.2.1 }
50 jwhaley 1.1.2.1
51 jwhaley 1.1.2.1 public String toString() {
52 jwhaley 1.1.2.1 return "EXPR(#" + getExp().getID() + ")";
53 jwhaley 1.1.2.1 }
54 jwhaley 1.1.2.1 }
55 cananian 1.2