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      */
ExpressionStatement(long where, Expression expr)45     public ExpressionStatement(long where, Expression expr) {
46         super(EXPRESSION, where);
47         this.expr = expr;
48     }
49 
50     /**
51      * Check statement
52      */
check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp)53     Vset check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) {
54         checkLabel(env, ctx);
55         return expr.check(env, ctx, reach(env, vset), exp);
56     }
57 
58     /**
59      * Inline
60      */
inline(Environment env, Context ctx)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      */
copyInline(Context ctx, boolean valNeeded)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      */
costInline(int thresh, Environment env, Context ctx)81     public int costInline(int thresh, Environment env, Context ctx) {
82         return expr.costInline(thresh, env, ctx);
83     }
84 
85     /**
86      * Code
87      */
code(Environment env, Context ctx, Assembler asm)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      */
firstConstructor()95     public Expression firstConstructor() {
96         return expr.firstConstructor();
97     }
98 
99     /**
100      * Print
101      */
print(PrintStream out, int indent)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 }
112