GCJ-DBTOOL(1) GNU GCJ-DBTOOL(1)NAMEgcj-dbtool - Manipulate class file mapping databases for libgcj
SYNOPSISgcj-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 ALSOgcc(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, 2010 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.
gcc-4.6.3 2012-03-06 GCJ-DBTOOL(1)