ArrayData.java revision 579d7739c53a2707ad711a2d2cae46d7d782f061 
1/*
2 * Copyright (C) 2008 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;
18
19import com.android.dx.io.Opcodes;
20import com.android.dx.rop.code.RegisterSpecList;
21import com.android.dx.rop.code.SourcePosition;
22import com.android.dx.rop.cst.*;
23import com.android.dx.util.AnnotatedOutput;
24import com.android.dx.util.Hex;
25import com.android.dx.rop.type.Type;
26import java.util.ArrayList;
27
28/**
29 * Pseudo-instruction which holds fill array data.
30 */
31public final class ArrayData extends VariableSizeInsn {
32    /**
33     * {@code non-null;} address representing the instruction that uses this
34     * instance
35     */
36    private final CodeAddress user;
37
38    /** {@code non-null;} initial values to be filled into an array */
39    private final ArrayList<Constant> values;
40
41    /** non-null: type of constant that initializes the array */
42    private final Constant arrayType;
43
44    /** Width of the init value element */
45    private final int elemWidth;
46
47    /** Length of the init list */
48    private final int initLength;
49
50    /**
51     * Constructs an instance. The output address of this instance is initially
52     * unknown ({@code -1}).
53     *
54     * @param position {@code non-null;} source position
55     * @param user {@code non-null;} address representing the instruction that
56     * uses this instance
57     * @param values {@code non-null;} initial values to be filled into an array
58     */
59    public ArrayData(SourcePosition position, CodeAddress user,
60                     ArrayList<Constant> values,
61                     Constant arrayType) {
62        super(position, RegisterSpecList.EMPTY);
63
64        if (user == null) {
65            throw new NullPointerException("user == null");
66        }
67
68        if (values == null) {
69            throw new NullPointerException("values == null");
70        }
71
72        int sz = values.size();
73
74        if (sz <= 0) {
75            throw new IllegalArgumentException("Illegal number of init values");
76        }
77
78        this.arrayType = arrayType;
79
80        if (arrayType == CstType.BYTE_ARRAY ||
81                arrayType == CstType.BOOLEAN_ARRAY) {
82            elemWidth = 1;
83        } else if (arrayType == CstType.SHORT_ARRAY ||
84                arrayType == CstType.CHAR_ARRAY) {
85            elemWidth = 2;
86        } else if (arrayType == CstType.INT_ARRAY ||
87                arrayType == CstType.FLOAT_ARRAY) {
88            elemWidth = 4;
89        } else if (arrayType == CstType.LONG_ARRAY ||
90                arrayType == CstType.DOUBLE_ARRAY) {
91            elemWidth = 8;
92        } else {
93            throw new IllegalArgumentException("Unexpected constant type");
94        }
95        this.user = user;
96        this.values = values;
97        initLength = values.size();
98    }
99
100    /** {@inheritDoc} */
101    @Override
102    public int codeSize() {
103        int sz = initLength;
104        // Note: the unit here is 16-bit
105        return 4 + ((sz * elemWidth) + 1) / 2;
106    }
107
108    /** {@inheritDoc} */
109    @Override
110    public void writeTo(AnnotatedOutput out) {
111        int sz = values.size();
112
113        out.writeShort(Opcodes.FILL_ARRAY_DATA_PAYLOAD);
114        out.writeShort(elemWidth);
115        out.writeInt(initLength);
116
117
118        // For speed reasons, replicate the for loop in each case
119        switch (elemWidth) {
120            case 1: {
121                for (int i = 0; i < sz; i++) {
122                    Constant cst = values.get(i);
123                    out.writeByte((byte) ((CstLiteral32) cst).getIntBits());
124                }
125                break;
126            }
127            case 2: {
128                for (int i = 0; i < sz; i++) {
129                    Constant cst = values.get(i);
130                    out.writeShort((short) ((CstLiteral32) cst).getIntBits());
131                }
132                break;
133            }
134            case 4: {
135                for (int i = 0; i < sz; i++) {
136                    Constant cst = values.get(i);
137                    out.writeInt(((CstLiteral32) cst).getIntBits());
138                }
139                break;
140            }
141            case 8: {
142                for (int i = 0; i < sz; i++) {
143                    Constant cst = values.get(i);
144                    out.writeLong(((CstLiteral64) cst).getLongBits());
145                }
146                break;
147            }
148            default:
149                break;
150        }
151
152        // Pad one byte to make the size of data table multiples of 16-bits
153        if (elemWidth == 1 && (sz % 2 != 0)) {
154            out.writeByte(0x00);
155        }
156    }
157
158    /** {@inheritDoc} */
159    @Override
160    public DalvInsn withRegisters(RegisterSpecList registers) {
161        return new ArrayData(getPosition(), user, values, arrayType);
162    }
163
164    /** {@inheritDoc} */
165    @Override
166    protected String argString() {
167        StringBuffer sb = new StringBuffer(100);
168
169        int sz = values.size();
170        for (int i = 0; i < sz; i++) {
171            sb.append("\n    ");
172            sb.append(i);
173            sb.append(": ");
174            sb.append(values.get(i).toHuman());
175        }
176
177        return sb.toString();
178    }
179
180    /** {@inheritDoc} */
181    @Override
182    protected String listingString0(boolean noteIndices) {
183        int baseAddress = user.getAddress();
184        StringBuffer sb = new StringBuffer(100);
185        int sz = values.size();
186
187        sb.append("fill-array-data-payload // for fill-array-data @ ");
188        sb.append(Hex.u2(baseAddress));
189
190        for (int i = 0; i < sz; i++) {
191            sb.append("\n  ");
192            sb.append(i);
193            sb.append(": ");
194            sb.append(values.get(i).toHuman());
195        }
196
197        return sb.toString();
198    }
199}
200