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>] [--incremental] [--force-jumbo]\n" +
37        "  [--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]\n" +
38        "  [<file>.class | <file>.{zip,jar,apk} | <directory>] ...\n" +
39        "    Convert a set of classfiles into a dex file, optionally " +
40        "embedded in a\n" +
41        "    jar/zip. Output name must end with one of: .dex .jar " +
42        ".zip .apk or be a directory.\n" +
43        "    Positions options: none, important, lines.\n" +
44        "    --multi-dex: allows to generate several dex files if needed. " +
45        "This option is \n" +
46        "    exclusive with --incremental, causes --num-threads to be ignored " +
47        "and only\n" +
48        "    supports folder or archive output.\n" +
49        "    --main-dex-list=<file>: <file> is a list of class file names, " +
50        "classes defined by\n" +
51        "    those class files are put in classes.dex.\n" +
52        "    --minimal-main-dex: only classes selected by --main-dex-list are " +
53        "to be put in\n" +
54        "    the main dex.\n" +
55        "  dx --annotool --annotation=<class> [--element=<element types>]\n" +
56        "  [--print=<print types>]\n" +
57        "  dx --dump [--debug] [--strict] [--bytes] [--optimize]\n" +
58        "  [--basic-blocks | --rop-blocks | --ssa-blocks | --dot] " +
59        "[--ssa-step=<step>]\n" +
60        "  [--width=<n>] [<file>.class | <file>.txt] ...\n" +
61        "    Dump classfiles, or transformations thereof, in a " +
62        "human-oriented format.\n" +
63        "  dx --find-usages <file.dex> <declaring type> <member>\n" +
64        "    Find references and declarations to a field or method.\n" +
65        "    declaring type: a class name in internal form, like " +
66        "Ljava/lang/Object;\n" +
67        "    member: a field or method name, like hashCode\n" +
68        "  dx -J<option> ... <arguments, in one of the above " +
69        "forms>\n" +
70        "    Pass VM-specific options to the virtual machine that " +
71        "runs dx.\n" +
72        "  dx --version\n" +
73        "    Print the version of this tool (" + Version.VERSION +
74        ").\n" +
75        "  dx --help\n" +
76        "    Print this message.";
77
78    /**
79     * This class is uninstantiable.
80     */
81    private Main() {
82        // This space intentionally left blank.
83    }
84
85    /**
86     * Run!
87     */
88    public static void main(String[] args) {
89        boolean gotCmd = false;
90        boolean showUsage = false;
91
92        try {
93            for (int i = 0; i < args.length; i++) {
94                String arg = args[i];
95                if (arg.equals("--") || !arg.startsWith("--")) {
96                    gotCmd = false;
97                    showUsage = true;
98                    break;
99                }
100
101                gotCmd = true;
102                if (arg.equals("--dex")) {
103                    com.android.dx.command.dexer.Main.main(without(args, i));
104                    break;
105                } else if (arg.equals("--dump")) {
106                    com.android.dx.command.dump.Main.main(without(args, i));
107                    break;
108                } else if (arg.equals("--annotool")) {
109                    com.android.dx.command.annotool.Main.main(
110                            without(args, i));
111                    break;
112                } else if (arg.equals("--find-usages")) {
113                    com.android.dx.command.findusages.Main.main(without(args, i));
114                    break;
115                } else if (arg.equals("--version")) {
116                    version();
117                    break;
118                } else if (arg.equals("--help")) {
119                    showUsage = true;
120                    break;
121                } else {
122                    gotCmd = false;
123                }
124            }
125        } catch (UsageException ex) {
126            showUsage = true;
127        } catch (RuntimeException ex) {
128            System.err.println("\nUNEXPECTED TOP-LEVEL EXCEPTION:");
129            ex.printStackTrace();
130            System.exit(2);
131        } catch (Throwable ex) {
132            System.err.println("\nUNEXPECTED TOP-LEVEL ERROR:");
133            ex.printStackTrace();
134            if ((ex instanceof NoClassDefFoundError)
135                    || (ex instanceof NoSuchMethodError)) {
136                System.err.println(
137                        "Note: You may be using an incompatible " +
138                        "virtual machine or class library.\n" +
139                        "(This program is known to be incompatible " +
140                        "with recent releases of GCJ.)");
141            }
142            System.exit(3);
143        }
144
145        if (!gotCmd) {
146            System.err.println("error: no command specified");
147            showUsage = true;
148        }
149
150        if (showUsage) {
151            usage();
152            System.exit(1);
153        }
154    }
155
156    /**
157     * Prints the version message.
158     */
159    private static void version() {
160        System.err.println("dx version " + Version.VERSION);
161        System.exit(0);
162    }
163
164    /**
165     * Prints the usage message.
166     */
167    private static void usage() {
168        System.err.println(USAGE_MESSAGE);
169    }
170
171    /**
172     * Returns a copy of the given args array, but without the indicated
173     * element.
174     *
175     * @param orig {@code non-null;} original array
176     * @param n which element to omit
177     * @return {@code non-null;} new array
178     */
179    private static String[] without(String[] orig, int n) {
180        int len = orig.length - 1;
181        String[] newa = new String[len];
182        System.arraycopy(orig, 0, newa, 0, n);
183        System.arraycopy(orig, n + 1, newa, n, len - n);
184        return newa;
185    }
186}
187