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Java > Open Source Codes > org > aspectj > compiler > base > ast > ThisExpr


1 /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2  *
3  * This file is part of the compiler and core tools for the AspectJ(tm)
4  * programming language; see http://aspectj.org
5  *
6  * The contents of this file are subject to the Mozilla Public License
7  * Version 1.1 (the "License"); you may not use this file except in
8  * compliance with the License. You may obtain a copy of the License at
9  * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/.
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is AspectJ.
17  *
18  * The Initial Developer of the Original Code is Xerox Corporation. Portions
19  * created by Xerox Corporation are Copyright (C) 1999-2002 Xerox Corporation.
20  * All Rights Reserved.
21  *
22  * Contributor(s):
23  */
24
25 package org.aspectj.compiler.base.ast;
26
27 import org.aspectj.compiler.base.*;
28
29 import org.aspectj.compiler.base.bcg.CodeBuilder;
30 import org.aspectj.compiler.base.bcg.Label;
31
32 /**
33  * @grammar this
34  */
35
36 public class ThisExpr extends Expr {
37
38     public Type discoverType() {
39         //showWarning("discover type: " + getDeclaringType());
40 return getDeclaringType();
41     }
42
43     public ThisExpr(SourceLocation source, Type type) {
44         super(source);
45         this.setType(type);
46     }
47
48     public Expr makeReference() {
49         return (Expr)this.copy();
50     }
51     
52     public boolean canBeCopied() {
53         return true;
54     }
55     
56     public boolean isUltimatelyLiteral() {
57         return false;
58     }
59
60     //INTRO from MovingWalker
61 public ASTObject postMove(MovingWalker walker) {
62         //System.out.println("moving: " + this + " by " + walker);
63 return walker.moveThisExpr(this, getType());
64     }
65
66     // ------------------------------
67 // INTRO from InnerInfoPass -- should have a more generic name
68
69     public void postInnerInfo(InnerInfoPass walker) {
70         if (!walker.isAccessibleExactly(getType())) {
71             if (!fromSource() && getParent().fromSource()) {
72                 getParent().showError("no instance available");
73             } else {
74                 showError("no instance available");
75             }
76         }
77     }
78
79     public void unparse(CodeWriter writer) {
80         writer.writeKeyword("this");
81     }
82
83     // ------------------------------
84 // bcg
85
86     protected void cgValue(CodeBuilder cb) {
87         cb.emitALOAD(0);
88     }
89     protected void cgEffect(CodeBuilder cb) { }
90
91     //BEGIN: Generated from @child and @property
92
93     public ThisExpr(SourceLocation location) {
94         super(location);
95
96     }
97
98     public ASTObject copyWalk(CopyWalker walker) {
99         ThisExpr ret = new ThisExpr(getSourceLocation());
100         ret.preCopy(walker, this);
101
102         return ret;
103     }
104
105
106     public String JavaDoc getDefaultDisplayName() {
107         return "ThisExpr()";
108     }
109
110     //END: Generated from @child and @property
111 }
112
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