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
26package sun.tools.tree;
27
28import sun.tools.java.*;
29import sun.tools.asm.Assembler;
30import java.util.Hashtable;
31
32/**
33 * WARNING: The contents of this source file are not part of any
34 * supported API.  Code that depends on them does so at its own risk:
35 * they are subject to change or removal without notice.
36 */
37public
38class BinaryAssignExpression extends BinaryExpression {
39    Expression implementation;
40
41    /**
42     * Constructor
43     */
44    BinaryAssignExpression(int op, long where, Expression left, Expression right) {
45        super(op, where, left.type, left, right);
46    }
47
48    public Expression getImplementation() {
49        if (implementation != null)
50            return implementation;
51        return this;
52    }
53
54    /**
55     * Order the expression based on precedence
56     */
57    public Expression order() {
58        if (precedence() >= left.precedence()) {
59            UnaryExpression e = (UnaryExpression)left;
60            left = e.right;
61            e.right = order();
62            return e;
63        }
64        return this;
65    }
66
67    /**
68     * Check void expression
69     */
70    public Vset check(Environment env, Context ctx, Vset vset, Hashtable<Object,Object> exp) {
71        return checkValue(env, ctx, vset, exp);
72    }
73
74    /**
75     * Inline
76     */
77    public Expression inline(Environment env, Context ctx) {
78        if (implementation != null)
79            return implementation.inline(env, ctx);
80        return inlineValue(env, ctx);
81    }
82    public Expression inlineValue(Environment env, Context ctx) {
83        if (implementation != null)
84            return implementation.inlineValue(env, ctx);
85        left = left.inlineLHS(env, ctx);
86        right = right.inlineValue(env, ctx);
87        return this;
88    }
89
90    public Expression copyInline(Context ctx) {
91        if (implementation != null)
92            return implementation.copyInline(ctx);
93        return super.copyInline(ctx);
94    }
95
96    public int costInline(int thresh, Environment env, Context ctx) {
97        if (implementation != null)
98            return implementation.costInline(thresh, env, ctx);
99        return super.costInline(thresh, env, ctx);
100    }
101}
102