1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.dx.dex.code.form;
18
19import com.android.dx.dex.code.DalvInsn;
20import com.android.dx.dex.code.InsnFormat;
21import com.android.dx.dex.code.TargetInsn;
22import com.android.dx.rop.code.RegisterSpecList;
23import com.android.dx.util.AnnotatedOutput;
24
25import java.util.BitSet;
26
27/**
28 * Instruction format {@code 31t}. See the instruction format spec
29 * for details.
30 */
31public final class Form31t extends InsnFormat {
32    /** {@code non-null;} unique instance of this class */
33    public static final InsnFormat THE_ONE = new Form31t();
34
35    /**
36     * Constructs an instance. This class is not publicly
37     * instantiable. Use {@link #THE_ONE}.
38     */
39    private Form31t() {
40        // This space intentionally left blank.
41    }
42
43    /** {@inheritDoc} */
44    @Override
45    public String insnArgString(DalvInsn insn) {
46        RegisterSpecList regs = insn.getRegisters();
47        return regs.get(0).regString() + ", " + branchString(insn);
48    }
49
50    /** {@inheritDoc} */
51    @Override
52    public String insnCommentString(DalvInsn insn, boolean noteIndices) {
53        return branchComment(insn);
54    }
55
56    /** {@inheritDoc} */
57    @Override
58    public int codeSize() {
59        return 3;
60    }
61
62    /** {@inheritDoc} */
63    @Override
64    public boolean isCompatible(DalvInsn insn) {
65        RegisterSpecList regs = insn.getRegisters();
66
67        if (!((insn instanceof TargetInsn) &&
68              (regs.size() == 1) &&
69              unsignedFitsInByte(regs.get(0).getReg()))) {
70            return false;
71        }
72
73        return true;
74    }
75
76    /** {@inheritDoc} */
77    @Override
78    public BitSet compatibleRegs(DalvInsn insn) {
79        RegisterSpecList regs = insn.getRegisters();
80        BitSet bits = new BitSet(1);
81
82        bits.set(0, unsignedFitsInByte(regs.get(0).getReg()));
83        return bits;
84    }
85
86    /** {@inheritDoc} */
87    @Override
88    public boolean branchFits(TargetInsn insn) {
89        return true;
90    }
91
92    /** {@inheritDoc} */
93    @Override
94    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
95        RegisterSpecList regs = insn.getRegisters();
96        int offset = ((TargetInsn) insn).getTargetOffset();
97
98        write(out, opcodeUnit(insn, regs.get(0).getReg()), offset);
99    }
100}
101