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 sun.tools.asm.Label;
31import java.io.PrintStream;
32import java.util.Hashtable;
33
34/**
35 * WARNING: The contents of this source file are not part of any
36 * supported API.  Code that depends on them does so at its own risk:
37 * they are subject to change or removal without notice.
38 */
39public
40class InstanceOfExpression extends BinaryExpression {
41    /**
42     * constructor
43     */
44    public InstanceOfExpression(long where, Expression left, Expression right) {
45        super(INSTANCEOF, where, Type.tBoolean, left, right);
46    }
47
48    /**
49     * Check the expression
50     */
51    public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) {
52        vset = left.checkValue(env, ctx, vset, exp);
53        right = new TypeExpression(right.where, right.toType(env, ctx));
54
55        if (right.type.isType(TC_ERROR) || left.type.isType(TC_ERROR)) {
56            // An error was already reported
57            return vset;
58        }
59
60        if (!right.type.inMask(TM_CLASS|TM_ARRAY)) {
61            env.error(right.where, "invalid.arg.type", right.type, opNames[op]);
62            return vset;
63        }
64        try {
65            if (!env.explicitCast(left.type, right.type)) {
66                env.error(where, "invalid.instanceof", left.type, right.type);
67            }
68        } catch (ClassNotFound e) {
69            env.error(where, "class.not.found", e.name, opNames[op]);
70        }
71        return vset;
72    }
73
74    /**
75     * Inline
76     */
77    public Expression inline(Environment env, Context ctx) {
78        return left.inline(env, ctx);
79    }
80    public Expression inlineValue(Environment env, Context ctx) {
81        left = left.inlineValue(env, ctx);
82        return this;
83    }
84
85    public int costInline(int thresh, Environment env, Context ctx) {
86        if (ctx == null) {
87            return 1 + left.costInline(thresh, env, ctx);
88        }
89        // sourceClass is the current class trying to inline this method
90        ClassDefinition sourceClass = ctx.field.getClassDefinition();
91        try {
92            // We only allow the inlining if the current class can access
93            // the "instance of" class
94            if (right.type.isType(TC_ARRAY) ||
95                 sourceClass.permitInlinedAccess(env, env.getClassDeclaration(right.type)))
96                return 1 + left.costInline(thresh, env, ctx);
97        } catch (ClassNotFound e) {
98        }
99        return thresh;
100    }
101
102
103
104
105    /**
106     * Code
107     */
108    public void codeValue(Environment env, Context ctx, Assembler asm) {
109        left.codeValue(env, ctx, asm);
110        if (right.type.isType(TC_CLASS)) {
111            asm.add(where, opc_instanceof, env.getClassDeclaration(right.type));
112        } else {
113            asm.add(where, opc_instanceof, right.type);
114        }
115    }
116    void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) {
117        codeValue(env, ctx, asm);
118        asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl, whenTrue);
119    }
120    public void code(Environment env, Context ctx, Assembler asm) {
121        left.code(env, ctx, asm);
122    }
123
124    /**
125     * Print
126     */
127    public void print(PrintStream out) {
128        out.print("(" + opNames[op] + " ");
129        left.print(out);
130        out.print(" ");
131        if (right.op == TYPE) {
132            out.print(right.type.toString());
133        } else {
134            right.print(out);
135        }
136        out.print(")");
137    }
138}
139