1   /*
    2    * Copyright (c) 2003, 2005, 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
    6    * under the terms of the GNU General Public License version 2 only, as
    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.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package com.sun.tools.javac.jvm;
   27   
   28   import com.sun.tools.javac.code;
   29   
   30   
   31   /** These pseudo-types appear in the generated verifier tables to
   32    *  indicate objects that have been allocated but not yet constructed.
   33    *
   34    *  <p><b>This is NOT part of any supported API.
   35    *  If you write code that depends on this, you do so at your own risk.
   36    *  This code and its internal interfaces are subject to change or
   37    *  deletion without notice.</b>
   38    */
   39   class UninitializedType extends Type.DelegatedType {
   40       public static final int UNINITIALIZED_THIS = TypeTags.TypeTagCount;
   41       public static final int UNINITIALIZED_OBJECT = UNINITIALIZED_THIS + 1;
   42   
   43       public static UninitializedType uninitializedThis(Type qtype) {
   44           return new UninitializedType(UNINITIALIZED_THIS, qtype, -1);
   45       }
   46   
   47       public static UninitializedType uninitializedObject(Type qtype, int offset) {
   48           return new UninitializedType(UNINITIALIZED_OBJECT, qtype, offset);
   49       }
   50   
   51       public final int offset; // PC where allocation took place
   52       private UninitializedType(int tag, Type qtype, int offset) {
   53           super(tag, qtype);
   54           this.offset = offset;
   55       }
   56   
   57       Type initializedType() {
   58           return qtype;
   59       }
   60   }