NAME
gcj-dbtool - Manipulate class file mapping databases for libgcj
SYNOPSIS
gcj-dbtool OPTION DBFILE [MORE] ...
gcj-dbtool [-0] [-] [-n] [-a] [-f]
[-t] [-l] [-p [LIBDIR]]
[-v] [-m] [--version] [--help]
DESCRIPTION
"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
-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
COPYRIGHT
Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007 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 1.2 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "GNU General Public License", 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.