gcj-dbtool(1)
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
gcc(1), gcj(1), gcjh(1), jcf-dump(1), gfdl(7), and the Info entries for
gcj and gcc.
COPYRIGHT
Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 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.