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1   /*
2    * Copyright (c) 1994, 2003, 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 sun.tools.tree;
27  
28  import sun.tools.java.*;
29  import sun.tools.asm.Assembler;
30  import java.io.PrintStream;
31  import java.util.Hashtable;
32  
33  /**
34   * WARNING: The contents of this source file are not part of any
35   * supported API.  Code that depends on them does so at its own risk:
36   * they are subject to change or removal without notice.
37   */
38  public
39  class SuperExpression extends ThisExpression {
40  
41      /**
42       * Constructor
43       */
44      public SuperExpression(long where) {
45          super(SUPER, where);
46      }
47  
48      /**
49       * Constructor for "outer.super()"
50       */
51      public SuperExpression(long where, Expression outerArg) {
52          super(where, outerArg);
53          op = SUPER;
54      }
55  
56      public SuperExpression(long where, Context ctx) {
57          super(where, ctx);
58          op = SUPER;
59      }
60  
61      /**
62       * Check expression
63       */
64      public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) {
65          vset = checkCommon(env, ctx, vset, exp);
66          if (type != Type.tError) {
67              // "super" is not allowed in this context:
68              env.error(where, "undef.var.super", idSuper);
69          }
70          return vset;
71      }
72  
73      /**
74       * Check if the present name is part of a scoping prefix.
75       */
76      public Vset checkAmbigName(Environment env, Context ctx,
77                                 Vset vset, Hashtable exp,
78                                 UnaryExpression loc) {
79          return checkCommon(env, ctx, vset, exp);
80      }
81  
82      /** Common code for checkValue and checkAmbigName */
83      private Vset checkCommon(Environment env, Context ctx, Vset vset, Hashtable exp) {
84          ClassDeclaration superClass = ctx.field.getClassDefinition().getSuperClass();
85          if (superClass == null) {
86              env.error(where, "undef.var", idSuper);
87              type = Type.tError;
88              return vset;
89          }
90          vset = super.checkValue(env, ctx, vset, exp);
91          type = superClass.getType();
92          return vset;
93      }
94  
95  }