1GCJ-DBTOOL(1)                         GNU                        GCJ-DBTOOL(1)
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NAME

6       gcj-dbtool - Manipulate class file mapping databases for libgcj
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SYNOPSIS

9       gcj-dbtool OPTION DBFILE [MORE] ...
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11       gcj-dbtool [-0] [-] [-n] [-a] [-f]
12         [-t] [-l] [-p [LIBDIR]]
13         [-v] [-m] [--version] [--help]
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DESCRIPTION

16       "gcj-dbtool" is a tool for creating and manipulating class file mapping
17       databases.  "libgcj" can use these databases to find a shared library
18       corresponding to the bytecode representation of a class.  This func‐
19       tionality is useful for ahead-of-time compilation of a program that has
20       no knowledge of "gcj".
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22       "gcj-dbtool" works best if all the jar files added to it are compiled
23       using "-findirect-dispatch".
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25       Note that "gcj-dbtool" is currently available as "preview technology".
26       We believe it is a reasonable way to allow application-transparent
27       ahead-of-time compilation, but this is an unexplored area.  We welcome
28       your comments.
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OPTIONS

31       -n DBFILE [SIZE]
32           This creates a new database.  Currently, databases cannot be
33           resized; you can choose a larger initial size if desired.  The
34           default size is 32,749.
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36       -a DBFILE JARFILE LIB
37       -f DBFILE JARFILE LIB
38           This adds a jar file to the database.  For each class file in the
39           jar, a cryptographic signature of the bytecode representation of
40           the class is recorded in the database.  At runtime, a class is
41           looked up by its signature and the compiled form of the class is
42           looked for in the corresponding shared library.  The -a option will
43           verify that LIB exists before adding it to the database; -f skips
44           this check.
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46       [-][-0] -m DBFILE DBFILE,[DBFILE]
47           Merge a number of databases.  The output database overwrites any
48           existing database.  To add databases into an existing database,
49           include the destination in the list of sources.
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51           If - or -0 are used, the list of files to read is taken from stan‐
52           dard input instead of the command line.  For -0, Input filenames
53           are terminated by a null character instead of by whitespace.  Use‐
54           ful when arguments might contain white space.  The GNU find -print0
55           option produces input suitable for this mode.
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57       -t DBFILE
58           Test a database.
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60       -l DBFILE
61           List the contents of a database.
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63       -p  Print the name of the default database.  If there is no default
64           database, this prints a blank line.  If LIBDIR is specified, use it
65           instead of the default library directory component of the database
66           name.
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68       --help
69           Print a help message, then exit.
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71       --version
72       -v  Print version information, then exit.
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SEE ALSO

COPYRIGHT

76       Copyright (c) 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
77       Inc.
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79       Permission is granted to copy, distribute and/or modify this document
80       under the terms of the GNU Free Documentation License, Version 1.2 or
81       any later version published by the Free Software Foundation; with the
82       Invariant Sections being "GNU General Public License", the Front-Cover
83       texts being (a) (see below), and with the Back-Cover Texts being (b)
84       (see below).  A copy of the license is included in the man page
85       gfdl(7).
86
87       (a) The FSF's Front-Cover Text is:
88
89            A GNU Manual
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91       (b) The FSF's Back-Cover Text is:
92
93            You have freedom to copy and modify this GNU Manual, like GNU
94            software.  Copies published by the Free Software Foundation raise
95            funds for GNU development.
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99gcc-4.1.2                         2007-09-25                     GCJ-DBTOOL(1)