Form23x.java revision 99409883d9c4c0ffb49b070ce307bb33a9dfe9f1 
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;
24
25/**
26 * Instruction format {@code 23x}. See the instruction format spec
27 * for details.
28 */
29public final class Form23x extends InsnFormat {
30    /** {@code non-null;} unique instance of this class */
31    public static final InsnFormat THE_ONE = new Form23x();
32
33    /**
34     * Constructs an instance. This class is not publicly
35     * instantiable. Use {@link #THE_ONE}.
36     */
37    private Form23x() {
38        // This space intentionally left blank.
39    }
40
41    /** {@inheritDoc} */
42    @Override
43    public String insnArgString(DalvInsn insn) {
44        RegisterSpecList regs = insn.getRegisters();
45        return regs.get(0).regString() + ", " + regs.get(1).regString() +
46            ", " + regs.get(2).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 2;
60    }
61
62    /** {@inheritDoc} */
63    @Override
64    public boolean isCompatible(DalvInsn insn) {
65        RegisterSpecList regs = insn.getRegisters();
66
67        return (insn instanceof SimpleInsn) &&
68            (regs.size() == 3) &&
69            unsignedFitsInByte(regs.get(0).getReg()) &&
70            unsignedFitsInByte(regs.get(1).getReg()) &&
71            unsignedFitsInByte(regs.get(2).getReg());
72    }
73
74    /** {@inheritDoc} */
75    @Override
76    public InsnFormat nextUp() {
77        return Form32x.THE_ONE;
78    }
79
80    /** {@inheritDoc} */
81    @Override
82    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
83        RegisterSpecList regs = insn.getRegisters();
84        write(out,
85              opcodeUnit(insn, regs.get(0).getReg()),
86              codeUnit(regs.get(1).getReg(), regs.get(2).getReg()));
87    }
88}
89