1 /*

     2  * Copyright (c) 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

     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 jdk.nashorn.internal.ir;

    27 

    28 import java.io.Serializable;

    29 import java.util.List;

    30 import jdk.nashorn.internal.codegen.CompileUnit;

    31 

    32 /**

    33  * An interface for splittable expressions.

    34  */

    35 public interface Splittable {

    36 

    37     /**

    38      * Get a list of split ranges for this splittable expression, or null

    39      * if the expression should not be split.

    40      *

    41      * @return a list of split ranges

    42      */

    43     List<SplitRange> getSplitRanges();

    44 

    45     /**

    46      * A SplitRange is a range in a splittable expression. It defines the

    47      * boundaries of the split range and provides a compile unit for code generation.

    48      */

    49     final class SplitRange implements CompileUnitHolder, Serializable {

    50         private static final long serialVersionUID = 1L;

    51 

    52         /** Compile unit associated with the postsets range. */

    53         private final CompileUnit compileUnit;

    54 

    55         /** postsets range associated with the unit (hi not inclusive). */

    56         private final int low, high;

    57 

    58         /**

    59          * Constructor

    60          * @param compileUnit compile unit

    61          * @param low lowest array index in unit

    62          * @param high highest array index in unit + 1

    63          */

    64         public SplitRange(final CompileUnit compileUnit, final int low, final int high) {

    65             this.compileUnit = compileUnit;

    66             this.low   = low;

    67             this.high   = high;

    68         }

    69 

    70         /**

    71          * Get the high index position of the ArrayUnit (exclusive)

    72          * @return high index position

    73          */

    74         public int getHigh() {

    75             return high;

    76         }

    77 

    78         /**

    79          * Get the low index position of the ArrayUnit (inclusive)

    80          * @return low index position

    81          */

    82         public int getLow() {

    83             return low;

    84         }

    85 

    86         /**

    87          * The array compile unit

    88          * @return array compile unit

    89          */

    90         @Override

    91         public CompileUnit getCompileUnit() {

    92             return compileUnit;

    93         }

    94     }

    95 }