jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/ir/IndexNode.java@3a209cbd1d8f

8010701: Immutable nodes - final iteration
Reviewed-by: sundar, hannesw, jlaskey

     1 /*

     2  * Copyright (c) 2010, 2013, 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  */

    26 package jdk.nashorn.internal.ir;

    28 import jdk.nashorn.internal.codegen.types.Type;

    29 import jdk.nashorn.internal.ir.annotations.Immutable;

    30 import jdk.nashorn.internal.ir.visitor.NodeVisitor;

    31 import jdk.nashorn.internal.runtime.Source;

    33 /**

    34  * IR representation of an indexed access (brackets operator.)

    35  */

    36 @Immutable

    37 public final class IndexNode extends BaseNode {

    38     /** Property index. */

    39     private final Node index;

    41     /**

    42      * Constructors

    43      *

    44      * @param source  the source

    45      * @param token   token

    46      * @param finish  finish

    47      * @param base    base node for access

    48      * @param index   index for access

    49      */

    50     public IndexNode(final Source source, final long token, final int finish, final Node base, final Node index) {

    51         super(source, token, finish, base, false, false);

    52         this.index = index;

    53     }

    55     private IndexNode(final IndexNode indexNode, final Node base, final Node index, final boolean isFunction, final boolean hasCallSiteType) {

    56         super(indexNode, base, isFunction, hasCallSiteType);

    57         this.index = index;

    58     }

    60     @Override

    61     public Node accept(final NodeVisitor visitor) {

    62         if (visitor.enterIndexNode(this)) {

    63             final Node      newBase  = base.accept(visitor);

    64             final Node      newIndex = index.accept(visitor);

    65             final IndexNode newNode;

    66             if (newBase != base || newIndex != index) {

    67                 newNode = new IndexNode(this, newBase, newIndex, isFunction(), hasCallSiteType());

    68             } else {

    69                 newNode = this;

    70             }

    71             return visitor.leaveIndexNode(newNode);

    72         }

    74         return this;

    75     }

    77     @Override

    78     public void toString(final StringBuilder sb) {

    79         final boolean needsParen = tokenType().needsParens(base.tokenType(), true);

    81         if (hasCallSiteType()) {

    82             sb.append('{');

    83             final String desc = getType().getDescriptor();

    84             sb.append(desc.charAt(desc.length() - 1) == ';' ? "O" : getType().getDescriptor());

    85             sb.append('}');

    86         }

    88         if (needsParen) {

    89             sb.append('(');

    90         }

    92         base.toString(sb);

    94         if (needsParen) {

    95             sb.append(')');

    96         }

    98         sb.append('[');

    99         index.toString(sb);

   100         sb.append(']');

   101     }

   103     /**

   104      * Get the index expression for this IndexNode

   105      * @return the index

   106      */

   107     public Node getIndex() {

   108         return index;

   109     }

   111     @Override

   112     public BaseNode setIsFunction() {

   113         if (isFunction()) {

   114             return this;

   115         }

   116         return new IndexNode(this, base, index, true, hasCallSiteType());

   117     }

   119     @Override

   120     public IndexNode setType(final Type type) {

   121         logTypeChange(type);

   122         getSymbol().setTypeOverride(type); //always a temp so this is fine.

   123         return new IndexNode(this, base, index, isFunction(), true);

   124     }

   126 }

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