UninitializedType.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package com.sun.tools.javac.jvm;

import com.sun.tools.javac.code.*;
import com.sun.tools.javac.util.List;

import static com.sun.tools.javac.code.TypeTag.UNINITIALIZED_OBJECT;
import static com.sun.tools.javac.code.TypeTag.UNINITIALIZED_THIS;

/** These pseudo-types appear in the generated verifier tables to
 *  indicate objects that have been allocated but not yet constructed.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 */
class UninitializedType extends Type.DelegatedType {

    public static UninitializedType uninitializedThis(Type qtype) {
        return new UninitializedType(UNINITIALIZED_THIS, qtype, -1,
                                     qtype.getMetadata());
    }

    public static UninitializedType uninitializedObject(Type qtype, int offset) {
        return new UninitializedType(UNINITIALIZED_OBJECT, qtype, offset,
                                     qtype.getMetadata());
    }

    public final int offset; // PC where allocation took place
    private UninitializedType(TypeTag tag, Type qtype, int offset,
                              TypeMetadata metadata) {
        super(tag, qtype, metadata);
        this.offset = offset;
    }

    @Override
    public UninitializedType cloneWithMetadata(final TypeMetadata md) {
        return new UninitializedType(tag, qtype, offset, md);
    }

    Type initializedType() {
        return qtype;
    }
}