gcj-dbtool - Manipulate class file mapping databases for libgcj
gcj-dbtool OPTION DBFILE
gcj-dbtool [ -0
"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
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.
- -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
- -a DBFILE JARFILE
- -f DBFILE JARFILE
- 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
- [-][-0] -m
- 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.
- 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
- Print a help message, then exit.
- Print version information, then exit.
(7), and the Info entries for gcj
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