NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | COPYRIGHT | COLOPHON

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

NAME         top

       gcj-dbtool - Manipulate class file mapping databases for libgcj

SYNOPSIS         top

       gcj-dbtool OPTION DBFILE [MORE] ...

       gcj-dbtool [-0] [-] [-n] [-a] [-f]
         [-t] [-l] [-p [LIBDIR]]
         [-v] [-m] [--version] [--help]

DESCRIPTION         top

       "gcj-dbtool" is a tool for creating and manipulating class file
       mapping databases.  "libgcj" can use these databases to find a shared
       library corresponding to the bytecode representation of a class.
       This functionality is useful for ahead-of-time compilation of a
       program that has no knowledge of "gcj".

       "gcj-dbtool" works best if all the jar files added to it are compiled
       using "-findirect-dispatch".

       Note that "gcj-dbtool" is currently available as "preview
       technology".  We believe it is a reasonable way to allow application-
       transparent ahead-of-time compilation, but this is an unexplored
       area.  We welcome your comments.

OPTIONS         top

       -n DBFILE [SIZE]
           This creates a new database.  Currently, databases cannot be
           resized; you can choose a larger initial size if desired.  The
           default size is 32,749.

       -a DBFILE JARFILE LIB
       -f DBFILE JARFILE LIB
           This adds a jar file to the database.  For each class file in the
           jar, a cryptographic signature of the bytecode representation of
           the class is recorded in the database.  At runtime, a class is
           looked up by its signature and the compiled form of the class is
           looked for in the corresponding shared library.  The -a option
           will verify that LIB exists before adding it to the database; -f
           skips this check.

       [-][-0] -m DBFILE DBFILE,[DBFILE]
           Merge a number of databases.  The output database overwrites any
           existing database.  To add databases into an existing database,
           include the destination in the list of sources.

           If - or -0 are used, the list of files to read is taken from
           standard input instead of the command line.  For -0, Input
           filenames are terminated by a null character instead of by
           whitespace.  Useful when arguments might contain white space.
           The GNU find -print0 option produces input suitable for this
           mode.

       -t DBFILE
           Test a database.

       -l DBFILE
           List the contents of a database.

       -p  Print the name of the default database.  If there is no default
           database, this prints a blank line.  If LIBDIR is specified, use
           it instead of the default library directory component of the
           database name.

       --help
           Print a help message, then exit.

       --version
       -v  Print version information, then exit.

SEE ALSO         top

       gcc(1), gcj(1), gcjh(1), jcf-dump(1), gfdl(7), and the Info entries
       for gcj and gcc.

COPYRIGHT         top

       Copyright (c) 2001-2016 Free Software Foundation, Inc.

       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version 1.3 or
       any later version published by the Free Software Foundation; with no
       Invariant Sections, the Front-Cover Texts being (a) (see below), and
       with the Back-Cover Texts being (b) (see below).  A copy of the
       license is included in the man page gfdl(7).

       (a) The FSF's Front-Cover Text is:

            A GNU Manual

       (b) The FSF's Back-Cover Text is:

            You have freedom to copy and modify this GNU Manual, like GNU
            software.  Copies published by the Free Software Foundation raise
            funds for GNU development.

COLOPHON         top

       This page is part of the gcc (GNU Compiler Collection) project.
       Information about the project can be found at ⟨http://gcc.gnu.org/⟩.
       If you have a bug report for this manual page, see 
       ⟨http://gcc.gnu.org/bugs/⟩.  This page was obtained from the tarball
       gcc-6.3.0.tar.gz fetched from 
       ⟨ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/⟩ on 2017-04-25.
       If you discover any rendering problems in this HTML version of the
       page, or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the information
       in this COLOPHON (which is not part of the original manual page),
       send a mail to man-pages@man7.org

gcc-6.3.0                        2016-12-21                    GCJ-DBTOOL(1)