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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 ExpressionStatement extends Statement {
40      Expression expr;
41  
42      /**
43       * Constructor
44       */
45      public ExpressionStatement(long where, Expression expr) {
46          super(EXPRESSION, where);
47          this.expr = expr;
48      }
49  
50      /**
51       * Check statement
52       */
53      Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
54          checkLabel(env, ctx);
55          return expr.check(env, ctx, reach(env, vset), exp);
56      }
57  
58      /**
59       * Inline
60       */
61      public Statement inline(Environment env, Context ctx) {
62          if (expr != null) {
63              expr = expr.inline(env, ctx);
64              return (expr == null) ? null : this;
65          }
66          return null;
67      }
68  
69      /**
70       * Create a copy of the statement for method inlining
71       */
72      public Statement copyInline(Context ctx, boolean valNeeded) {
73          ExpressionStatement s = (ExpressionStatement)clone();
74          s.expr = expr.copyInline(ctx);
75          return s;
76      }
77  
78      /**
79       * The cost of inlining this statement
80       */
81      public int costInline(int thresh, Environment env, Context ctx) {
82          return expr.costInline(thresh, env, ctx);
83      }
84  
85      /**
86       * Code
87       */
88      public void code(Environment env, Context ctx, Assembler asm) {
89          expr.code(env, ctx, asm);
90      }
91  
92      /**
93       * Check if the first thing is a constructor invocation
94       */
95      public Expression firstConstructor() {
96          return expr.firstConstructor();
97      }
98  
99      /**
100      * Print
101      */
102     public void print(PrintStream out, int indent) {
103         super.print(out, indent);
104         if (expr != null) {
105             expr.print(out);
106         } else {
107             out.print("<empty>");
108         }
109         out.print(";");
110     }
111 }