jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/comp/Env.java@24a47c3062fe

6754988: Update copyright year
Summary: Update for files that have been modified starting July 2008
Reviewed-by: ohair, tbell

     1 /*

     2  * Copyright 1999-2008 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    26 package com.sun.tools.javac.comp;

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

    29 import java.util.Iterator;

    30 import java.util.NoSuchElementException;

    32 /** A class for environments, instances of which are passed as

    33  *  arguments to tree visitors.  Environments refer to important ancestors

    34  *  of the subtree that's currently visited, such as the enclosing method,

    35  *  the enclosing class, or the enclosing toplevel node. They also contain

    36  *  a generic component, represented as a type parameter, to carry further

    37  *  information specific to individual passes.

    38  *

    39  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

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

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

    42  *  deletion without notice.</b>

    43  */

    44 public class Env<A> implements Iterable<Env<A>> {

    46     /** The next enclosing environment.

    47      */

    48     public Env<A> next;

    50     /** The environment enclosing the current class.

    51      */

    52     public Env<A> outer;

    54     /** The tree with which this environment is associated.

    55      */

    56     public JCTree tree;

    58     /** The enclosing toplevel tree.

    59      */

    60     public JCTree.JCCompilationUnit toplevel;

    62     /** The next enclosing class definition.

    63      */

    64     public JCTree.JCClassDecl enclClass;

    66     /** The next enclosing method definition.

    67      */

    68     public JCTree.JCMethodDecl enclMethod;

    70     /** A generic field for further information.

    71      */

    72     public A info;

    74     /** Is this an environment for evaluating a base clause?

    75      */

    76     public boolean baseClause = false;

    78     /** Create an outermost environment for a given (toplevel)tree,

    79      *  with a given info field.

    80      */

    81     public Env(JCTree tree, A info) {

    82         this.next = null;

    83         this.outer = null;

    84         this.tree = tree;

    85         this.toplevel = null;

    86         this.enclClass = null;

    87         this.enclMethod = null;

    88         this.info = info;

    89     }

    91     /** Duplicate this environment, updating with given tree and info,

    92      *  and copying all other fields.

    93      */

    94     public Env<A> dup(JCTree tree, A info) {

    95         return dupto(new Env<A>(tree, info));

    96     }

    98     /** Duplicate this environment into a given Environment,

    99      *  using its tree and info, and copying all other fields.

   100      */

   101     public Env<A> dupto(Env<A> that) {

   102         that.next = this;

   103         that.outer = this.outer;

   104         that.toplevel = this.toplevel;

   105         that.enclClass = this.enclClass;

   106         that.enclMethod = this.enclMethod;

   107         return that;

   108     }

   110     /** Duplicate this environment, updating with given tree,

   111      *  and copying all other fields.

   112      */

   113     public Env<A> dup(JCTree tree) {

   114         return dup(tree, this.info);

   115     }

   117     /** Return closest enclosing environment which points to a tree with given tag.

   118      */

   119     public Env<A> enclosing(int tag) {

   120         Env<A> env1 = this;

   121         while (env1 != null && env1.tree.getTag() != tag) env1 = env1.next;

   122         return env1;

   123     }

   125     public String toString() {

   126         return "Env[" + info + (outer == null ? "" : ",outer=" + outer) + "]";

   127     }

   129     public Iterator<Env<A>> iterator() {

   130         return new Iterator<Env<A>>() {

   131             Env<A> next = Env.this;

   132             public boolean hasNext() {

   133                 return next.outer != null;

   134             }

   135             public Env<A> next() {

   136                 if (hasNext()) {

   137                     Env<A> current = next;

   138                     next = current.outer;

   139                     return current;

   140                 }

   141                 throw new NoSuchElementException();

   143             }

   144             public void remove() {

   145                 throw new UnsupportedOperationException();

   146             }

   147         };

   148     }

   149 }

Mercurial > jdk8-mips64-public > langtools / file revision