1 /*
2  * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package com.sun.tools.javac.jvm;
27 
28 import com.sun.tools.javac.code.*;
29 import com.sun.tools.javac.util.List;
30 
31 import static com.sun.tools.javac.code.TypeTag.UNINITIALIZED_OBJECT;
32 import static com.sun.tools.javac.code.TypeTag.UNINITIALIZED_THIS;
33 
34 /** These pseudo-types appear in the generated verifier tables to
35  *  indicate objects that have been allocated but not yet constructed.
36  *
37  *  <p><b>This is NOT part of any supported API.
38  *  If you write code that depends on this, you do so at your own risk.
39  *  This code and its internal interfaces are subject to change or
40  *  deletion without notice.</b>
41  */
42 class UninitializedType extends Type.DelegatedType {
43 
uninitializedThis(Type qtype)44     public static UninitializedType uninitializedThis(Type qtype) {
45         return new UninitializedType(UNINITIALIZED_THIS, qtype, -1,
46                                      qtype.getMetadata());
47     }
48 
uninitializedObject(Type qtype, int offset)49     public static UninitializedType uninitializedObject(Type qtype, int offset) {
50         return new UninitializedType(UNINITIALIZED_OBJECT, qtype, offset,
51                                      qtype.getMetadata());
52     }
53 
54     public final int offset; // PC where allocation took place
UninitializedType(TypeTag tag, Type qtype, int offset, TypeMetadata metadata)55     private UninitializedType(TypeTag tag, Type qtype, int offset,
56                               TypeMetadata metadata) {
57         super(tag, qtype, metadata);
58         this.offset = offset;
59     }
60 
61     @Override
cloneWithMetadata(final TypeMetadata md)62     public UninitializedType cloneWithMetadata(final TypeMetadata md) {
63         return new UninitializedType(tag, qtype, offset, md);
64     }
65 
initializedType()66     Type initializedType() {
67         return qtype;
68     }
69 }
70