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.SimpleInsn;
22import com.android.dx.rop.code.RegisterSpecList;
23import com.android.dx.util.AnnotatedOutput;
24import java.util.BitSet;
25
26/**
27 * Instruction format {@code 32x}. See the instruction format spec
28 * for details.
29 */
30public final class Form32x extends InsnFormat {
31    /** {@code non-null;} unique instance of this class */
32    public static final InsnFormat THE_ONE = new Form32x();
33
34    /**
35     * Constructs an instance. This class is not publicly
36     * instantiable. Use {@link #THE_ONE}.
37     */
38    private Form32x() {
39        // This space intentionally left blank.
40    }
41
42    /** {@inheritDoc} */
43    @Override
44    public String insnArgString(DalvInsn insn) {
45        RegisterSpecList regs = insn.getRegisters();
46        return regs.get(0).regString() + ", " + regs.get(1).regString();
47    }
48
49    /** {@inheritDoc} */
50    @Override
51    public String insnCommentString(DalvInsn insn, boolean noteIndices) {
52        // This format has no comment.
53        return "";
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        return (insn instanceof SimpleInsn) &&
67            (regs.size() == 2) &&
68            unsignedFitsInShort(regs.get(0).getReg()) &&
69            unsignedFitsInShort(regs.get(1).getReg());
70    }
71
72    /** {@inheritDoc} */
73    @Override
74    public BitSet compatibleRegs(DalvInsn insn) {
75        RegisterSpecList regs = insn.getRegisters();
76        BitSet bits = new BitSet(2);
77
78        bits.set(0, unsignedFitsInShort(regs.get(0).getReg()));
79        bits.set(1, unsignedFitsInShort(regs.get(1).getReg()));
80        return bits;
81    }
82
83    /** {@inheritDoc} */
84    @Override
85    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
86        RegisterSpecList regs = insn.getRegisters();
87
88        write(out,
89              opcodeUnit(insn, 0),
90              (short) regs.get(0).getReg(),
91              (short) regs.get(1).getReg());
92    }
93}
94