1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2010 Ben Gruver
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29package org.jf.baksmali.Adaptors;
30
31import org.jf.baksmali.baksmaliOptions;
32import org.jf.dexlib2.analysis.AnalyzedInstruction;
33import org.jf.dexlib2.analysis.RegisterType;
34import org.jf.util.IndentingWriter;
35
36import javax.annotation.Nonnull;
37import java.io.IOException;
38import java.util.BitSet;
39
40public class PostInstructionRegisterInfoMethodItem extends MethodItem {
41    @Nonnull private final RegisterFormatter registerFormatter;
42    @Nonnull private final AnalyzedInstruction analyzedInstruction;
43
44    public PostInstructionRegisterInfoMethodItem(@Nonnull RegisterFormatter registerFormatter,
45                                                 @Nonnull AnalyzedInstruction analyzedInstruction,
46                                                 int codeAddress) {
47        super(codeAddress);
48        this.registerFormatter = registerFormatter;
49        this.analyzedInstruction = analyzedInstruction;
50    }
51
52    @Override
53    public double getSortOrder() {
54        return 100.1;
55    }
56
57    @Override
58    public boolean writeTo(IndentingWriter writer) throws IOException {
59        int registerInfo = registerFormatter.options.registerInfo;
60        int registerCount = analyzedInstruction.getRegisterCount();
61        BitSet registers = new BitSet(registerCount);
62
63        if ((registerInfo & baksmaliOptions.ALL) != 0) {
64            registers.set(0, registerCount);
65        } else {
66            if ((registerInfo & baksmaliOptions.ALLPOST) != 0) {
67                registers.set(0, registerCount);
68            } else if ((registerInfo & baksmaliOptions.DEST) != 0) {
69                addDestRegs(registers, registerCount);
70            }
71        }
72
73        return writeRegisterInfo(writer, registers);
74    }
75
76    private void addDestRegs(BitSet printPostRegister, int registerCount) {
77        for (int registerNum=0; registerNum<registerCount; registerNum++) {
78            if (!analyzedInstruction.getPreInstructionRegisterType(registerNum).equals(
79                    analyzedInstruction.getPostInstructionRegisterType(registerNum))) {
80                printPostRegister.set(registerNum);
81            }
82        }
83    }
84
85    private boolean writeRegisterInfo(IndentingWriter writer, BitSet registers) throws IOException {
86        int registerNum = registers.nextSetBit(0);
87        if (registerNum < 0) {
88            return false;
89        }
90
91        writer.write('#');
92        for (; registerNum >= 0; registerNum = registers.nextSetBit(registerNum + 1)) {
93            RegisterType registerType = analyzedInstruction.getPostInstructionRegisterType(registerNum);
94
95            registerFormatter.writeTo(writer, registerNum);
96            writer.write('=');
97            registerType.writeTo(writer);
98            writer.write(';');
99        }
100        return true;
101    }
102}
103