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.command;
18
19import com.android.dx.Version;
20
21/**
22 * Main class for dx. It recognizes enough options to be able to dispatch
23 * to the right "actual" main.
24 */
25public class Main {
26    private static String USAGE_MESSAGE =
27        "usage:\n" +
28        "  dx --dex [--debug] [--verbose] [--positions=<style>] " +
29        "[--no-locals]\n" +
30        "  [--no-optimize] [--statistics] [--[no-]optimize-list=<file>] " +
31        "[--no-strict]\n" +
32        "  [--keep-classes] [--output=<file>] [--dump-to=<file>] " +
33        "[--dump-width=<n>]\n" +
34        "  [--dump-method=<name>[*]] [--verbose-dump] [--no-files] " +
35        "[--core-library]\n" +
36        "  [--num-threads=<n>]\n" +
37        "  [<file>.class | <file>.{zip,jar,apk} | <directory>] ...\n" +
38        "    Convert a set of classfiles into a dex file, optionally " +
39        "embedded in a\n" +
40        "    jar/zip. Output name must end with one of: .dex .jar " +
41        ".zip .apk. Positions\n" +
42        "    options: none, important, lines.\n" +
43        "  dx --annotool --annotation=<class> [--element=<element types>]\n" +
44        "  [--print=<print types>]\n" +
45        "  dx --dump [--debug] [--strict] [--bytes] [--optimize]\n" +
46        "  [--basic-blocks | --rop-blocks | --ssa-blocks | --dot] " +
47        "[--ssa-step=<step>]\n" +
48        "  [--width=<n>] [<file>.class | <file>.txt] ...\n" +
49        "    Dump classfiles, or transformations thereof, in a " +
50        "human-oriented format.\n" +
51        "  dx --find-usages <file.dex> <declaring type> <member>\n" +
52        "    Find references and declarations to a field or method.\n" +
53        "    declaring type: a class name in internal form, like " +
54        "Ljava/lang/Object;\n" +
55        "    member: a field or method name, like hashCode\n" +
56        "  dx -J<option> ... <arguments, in one of the above " +
57        "forms>\n" +
58        "    Pass VM-specific options to the virtual machine that " +
59        "runs dx.\n" +
60        "  dx --version\n" +
61        "    Print the version of this tool (" + Version.VERSION +
62        ").\n" +
63        "  dx --help\n" +
64        "    Print this message.";
65
66    /**
67     * This class is uninstantiable.
68     */
69    private Main() {
70        // This space intentionally left blank.
71    }
72
73    /**
74     * Run!
75     */
76    public static void main(String[] args) {
77        boolean gotCmd = false;
78        boolean showUsage = false;
79
80        try {
81            for (int i = 0; i < args.length; i++) {
82                String arg = args[i];
83                if (arg.equals("--") || !arg.startsWith("--")) {
84                    gotCmd = false;
85                    showUsage = true;
86                    break;
87                }
88
89                gotCmd = true;
90                if (arg.equals("--dex")) {
91                    com.android.dx.command.dexer.Main.main(without(args, i));
92                    break;
93                } else if (arg.equals("--dump")) {
94                    com.android.dx.command.dump.Main.main(without(args, i));
95                    break;
96                } else if (arg.equals("--annotool")) {
97                    com.android.dx.command.annotool.Main.main(
98                            without(args, i));
99                    break;
100                } else if (arg.equals("--find-usages")) {
101                    com.android.dx.command.findusages.Main.main(without(args, i));
102                    break;
103                } else if (arg.equals("--version")) {
104                    version();
105                    break;
106                } else if (arg.equals("--help")) {
107                    showUsage = true;
108                    break;
109                } else {
110                    gotCmd = false;
111                }
112            }
113        } catch (UsageException ex) {
114            showUsage = true;
115        } catch (RuntimeException ex) {
116            System.err.println("\nUNEXPECTED TOP-LEVEL EXCEPTION:");
117            ex.printStackTrace();
118            System.exit(2);
119        } catch (Throwable ex) {
120            System.err.println("\nUNEXPECTED TOP-LEVEL ERROR:");
121            ex.printStackTrace();
122            if ((ex instanceof NoClassDefFoundError)
123                    || (ex instanceof NoSuchMethodError)) {
124                System.err.println(
125                        "Note: You may be using an incompatible " +
126                        "virtual machine or class library.\n" +
127                        "(This program is known to be incompatible " +
128                        "with recent releases of GCJ.)");
129            }
130            System.exit(3);
131        }
132
133        if (!gotCmd) {
134            System.err.println("error: no command specified");
135            showUsage = true;
136        }
137
138        if (showUsage) {
139            usage();
140            System.exit(1);
141        }
142    }
143
144    /**
145     * Prints the version message.
146     */
147    private static void version() {
148        System.err.println("dx version " + Version.VERSION);
149        System.exit(0);
150    }
151
152    /**
153     * Prints the usage message.
154     */
155    private static void usage() {
156        System.err.println(USAGE_MESSAGE);
157    }
158
159    /**
160     * Returns a copy of the given args array, but without the indicated
161     * element.
162     *
163     * @param orig {@code non-null;} original array
164     * @param n which element to omit
165     * @return {@code non-null;} new array
166     */
167    private static String[] without(String[] orig, int n) {
168        int len = orig.length - 1;
169        String[] newa = new String[len];
170        System.arraycopy(orig, 0, newa, 0, n);
171        System.arraycopy(orig, n + 1, newa, n, len - n);
172        return newa;
173    }
174}
175