jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/ir/IndexNode.java@544e17632e96

8013913: Removed Source field from all nodes except FunctionNode in order to save footprint
Reviewed-by: jlaskey, attila

     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;

    32 /**

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

    34  */

    35 @Immutable

    36 public final class IndexNode extends BaseNode {

    37     /** Property index. */

    38     private final Node index;

    40     /**

    41      * Constructors

    42      *

    43      * @param token   token

    44      * @param finish  finish

    45      * @param base    base node for access

    46      * @param index   index for access

    47      */

    48     public IndexNode(final long token, final int finish, final Node base, final Node index) {

    49         super(token, finish, base, false, false);

    50         this.index = index;

    51     }

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

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

    55         this.index = index;

    56     }

    58     @Override

    59     public Node accept(final NodeVisitor visitor) {

    60         if (visitor.enterIndexNode(this)) {

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

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

    63             final IndexNode newNode;

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

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

    66             } else {

    67                 newNode = this;

    68             }

    69             return visitor.leaveIndexNode(newNode);

    70         }

    72         return this;

    73     }

    75     @Override

    76     public void toString(final StringBuilder sb) {

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

    79         if (hasCallSiteType()) {

    80             sb.append('{');

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

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

    83             sb.append('}');

    84         }

    86         if (needsParen) {

    87             sb.append('(');

    88         }

    90         base.toString(sb);

    92         if (needsParen) {

    93             sb.append(')');

    94         }

    96         sb.append('[');

    97         index.toString(sb);

    98         sb.append(']');

    99     }

   101     /**

   102      * Get the index expression for this IndexNode

   103      * @return the index

   104      */

   105     public Node getIndex() {

   106         return index;

   107     }

   109     @Override

   110     public BaseNode setIsFunction() {

   111         if (isFunction()) {

   112             return this;

   113         }

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

   115     }

   117     @Override

   118     public IndexNode setType(final Type type) {

   119         logTypeChange(type);

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

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

   122     }

   124 }

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