Form32x.java revision 579d7739c53a2707ad711a2d2cae46d7d782f061 
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
25import java.util.BitSet;
26
27/**
28 * Instruction format {@code 32x}. See the instruction format spec
29 * for details.
30 */
31public final class Form32x extends InsnFormat {
32    /** {@code non-null;} unique instance of this class */
33    public static final InsnFormat THE_ONE = new Form32x();
34
35    /**
36     * Constructs an instance. This class is not publicly
37     * instantiable. Use {@link #THE_ONE}.
38     */
39    private Form32x() {
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() + ", " + regs.get(1).regString();
48    }
49
50    /** {@inheritDoc} */
51    @Override
52    public String insnCommentString(DalvInsn insn, boolean noteIndices) {
53        // This format has no comment.
54        return "";
55    }
56
57    /** {@inheritDoc} */
58    @Override
59    public int codeSize() {
60        return 3;
61    }
62
63    /** {@inheritDoc} */
64    @Override
65    public boolean isCompatible(DalvInsn insn) {
66        RegisterSpecList regs = insn.getRegisters();
67        return (insn instanceof SimpleInsn) &&
68            (regs.size() == 2) &&
69            unsignedFitsInShort(regs.get(0).getReg()) &&
70            unsignedFitsInShort(regs.get(1).getReg());
71    }
72
73    /** {@inheritDoc} */
74    @Override
75    public BitSet compatibleRegs(DalvInsn insn) {
76        RegisterSpecList regs = insn.getRegisters();
77        BitSet bits = new BitSet(2);
78
79        bits.set(0, unsignedFitsInShort(regs.get(0).getReg()));
80        bits.set(1, unsignedFitsInShort(regs.get(1).getReg()));
81        return bits;
82    }
83
84    /** {@inheritDoc} */
85    @Override
86    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
87        RegisterSpecList regs = insn.getRegisters();
88
89        write(out,
90              opcodeUnit(insn, 0),
91              (short) regs.get(0).getReg(),
92              (short) regs.get(1).getReg());
93    }
94}
95