1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.optimize.info;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.CodeAttribute;
25import proguard.classfile.constant.*;
26import proguard.classfile.constant.visitor.ConstantVisitor;
27import proguard.classfile.instruction.*;
28import proguard.classfile.instruction.visitor.InstructionVisitor;
29import proguard.classfile.util.SimplifiedVisitor;
30import proguard.classfile.visitor.*;
31
32/**
33 * This InstructionVisitor marks whether the methods whose instructions it
34 * visits contain the invokedynamic instruction.
35 *
36 * @author Eric Lafortune
37 */
38public class DynamicInvocationMarker
39extends      SimplifiedVisitor
40implements   InstructionVisitor,
41             ConstantVisitor,
42             ClassVisitor,
43             MemberVisitor
44{
45    // Implementations for InstructionVisitor.
46
47    public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {}
48
49
50    public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
51    {
52        if (constantInstruction.opcode == InstructionConstants.OP_INVOKEDYNAMIC)
53        {
54            setInvokesDynamically(method);
55        }
56    }
57
58
59    // Small utility methods.
60
61    private static void setInvokesDynamically(Method method)
62    {
63        MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
64        if (info != null)
65        {
66            info.setInvokesDynamically();
67        }
68    }
69
70
71    /**
72     * Returns whether the given method calls the invokedynamic instruction.
73     */
74    public static boolean invokesDynamically(Method method)
75    {
76        MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
77        return info == null || info.invokesDynamically();
78    }
79}
80