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.dexgen.dex.code.form;
18
19import com.android.dexgen.dex.code.DalvInsn;
20import com.android.dexgen.dex.code.InsnFormat;
21import com.android.dexgen.dex.code.SimpleInsn;
22import com.android.dexgen.rop.code.RegisterSpecList;
23import com.android.dexgen.util.AnnotatedOutput;
24
25/**
26 * Instruction format {@code 11x}. See the instruction format spec
27 * for details.
28 */
29public final class Form11x extends InsnFormat {
30    /** {@code non-null;} unique instance of this class */
31    public static final InsnFormat THE_ONE = new Form11x();
32
33    /**
34     * Constructs an instance. This class is not publicly
35     * instantiable. Use {@link #THE_ONE}.
36     */
37    private Form11x() {
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();
46    }
47
48    /** {@inheritDoc} */
49    @Override
50    public String insnCommentString(DalvInsn insn, boolean noteIndices) {
51        // This format has no comment.
52        return "";
53    }
54
55    /** {@inheritDoc} */
56    @Override
57    public int codeSize() {
58        return 1;
59    }
60
61    /** {@inheritDoc} */
62    @Override
63    public boolean isCompatible(DalvInsn insn) {
64        RegisterSpecList regs = insn.getRegisters();
65        return (insn instanceof SimpleInsn) &&
66            (regs.size() == 1) &&
67            unsignedFitsInByte(regs.get(0).getReg());
68    }
69
70    /** {@inheritDoc} */
71    @Override
72    public InsnFormat nextUp() {
73        return null;
74    }
75
76    /** {@inheritDoc} */
77    @Override
78    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
79        RegisterSpecList regs = insn.getRegisters();
80        write(out, opcodeUnit(insn, regs.get(0).getReg()));
81    }
82}
83