1 /*

     2  * Copyright (c) 1999, 2014, 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.comp;

    27 

    28 import com.sun.tools.javac.util.*;

    29 import com.sun.tools.javac.code.*;

    30 import com.sun.tools.javac.code.Scope.WriteableScope;

    31 

    32 /** Contains information specific to the attribute and enter

    33  *  passes, to be used in place of the generic field in environments.

    34  *

    35  *  <p><b>This is NOT part of any supported API.

    36  *  If you write code that depends on this, you do so at your own risk.

    37  *  This code and its internal interfaces are subject to change or

    38  *  deletion without notice.</b>

    39  */

    40 public class AttrContext {

    41 

    42     /** The scope of local symbols.

    43      */

    44     WriteableScope scope = null;

    45 

    46     /** The number of enclosing `static' modifiers.

    47      */

    48     int staticLevel = 0;

    49 

    50     /** Is this an environment for a this(...) or super(...) call?

    51      */

    52     boolean isSelfCall = false;

    53 

    54     /** Are we evaluating the selector of a `super' or type name?

    55      */

    56     boolean selectSuper = false;

    57 

    58     /** Is the current target of lambda expression or method reference serializable?

    59      */

    60     boolean isSerializable = false;

    61 

    62     /**

    63      * Are we doing speculative attribution?

    64      */

    65     boolean isSpeculative = false;

    66 

    67     /** Are arguments to current function applications boxed into an array for varargs?

    68      */

    69     Resolve.MethodResolutionPhase pendingResolutionPhase = null;

    70 

    71     /** A record of the lint/SuppressWarnings currently in effect

    72      */

    73     Lint lint;

    74 

    75     /** The variable whose initializer is being attributed

    76      * useful for detecting self-references in variable initializers

    77      */

    78     Symbol enclVar = null;

    79 

    80     /** ResultInfo to be used for attributing 'return' statement expressions

    81      * (set by Attr.visitMethod and Attr.visitLambda)

    82      */

    83     Attr.ResultInfo returnResult = null;

    84 

    85     /** Symbol corresponding to the site of a qualified default super call

    86      */

    87     Type defaultSuperCallSite = null;

    88 

    89     /** Duplicate this context, replacing scope field and copying all others.

    90      */

    91     AttrContext dup(WriteableScope scope) {

    92         AttrContext info = new AttrContext();

    93         info.scope = scope;

    94         info.staticLevel = staticLevel;

    95         info.isSelfCall = isSelfCall;

    96         info.selectSuper = selectSuper;

    97         info.pendingResolutionPhase = pendingResolutionPhase;

    98         info.lint = lint;

    99         info.enclVar = enclVar;

   100         info.returnResult = returnResult;

   101         info.defaultSuperCallSite = defaultSuperCallSite;

   102         info.isSerializable = isSerializable;

   103         info.isSpeculative = isSpeculative;

   104         return info;

   105     }

   106 

   107     /** Duplicate this context, copying all fields.

   108      */

   109     AttrContext dup() {

   110         return dup(scope);

   111     }

   112 

   113     public Iterable<Symbol> getLocalElements() {

   114         if (scope == null)

   115             return List.nil();

   116         return scope.getSymbols();

   117     }

   118 

   119     boolean lastResolveVarargs() {

   120         return pendingResolutionPhase != null &&

   121                 pendingResolutionPhase.isVarargsRequired();

   122     }

   123 

   124     @Override

   125     public String toString() {

   126         return "AttrContext[" + scope.toString() + "]";

   127     }

   128 }