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=pod
=head1 NAME
llvm-extract - extract a function from an LLVM module
=head1 SYNOPSIS
B<llvm-extract> [I<options>] B<--func> I<function-name> [I<filename>]
=head1 DESCRIPTION
The B<llvm-extract> command takes the name of a function and extracts it from
the specified LLVM bitcode file. It is primarily used as a debugging tool to
reduce test cases from larger programs that are triggering a bug.
In addition to extracting the bitcode of the specified function,
B<llvm-extract> will also remove unreachable global variables, prototypes, and
unused types.
The B<llvm-extract> command reads its input from standard input if filename is
omitted or if filename is -. The output is always written to standard output,
unless the B<-o> option is specified (see below).
=head1 OPTIONS
=over
=item B<-f>
Enable binary output on terminals. Normally, B<llvm-extract> will refuse to
write raw bitcode output if the output stream is a terminal. With this option,
B<llvm-extract> will write raw bitcode regardless of the output device.
=item B<--func> I<function-name>
Extract the function named I<function-name> from the LLVM bitcode. May be
specified multiple times to extract multiple functions at once.
=item B<--rfunc> I<function-regular-expr>
Extract the function(s) matching I<function-regular-expr> from the LLVM bitcode.
All functions matching the regular expression will be extracted. May be
specified multiple times.
=item B<--glob> I<global-name>
Extract the global variable named I<global-name> from the LLVM bitcode. May be
specified multiple times to extract multiple global variables at once.
=item B<--rglob> I<glob-regular-expr>
Extract the global variable(s) matching I<global-regular-expr> from the LLVM
bitcode. All global variables matching the regular expression will be extracted.
May be specified multiple times.
=item B<-help>
Print a summary of command line options.
=item B<-o> I<filename>
Specify the output filename. If filename is "-" (the default), then
B<llvm-extract> sends its output to standard output.
=item B<-S>
Write output in LLVM intermediate language (instead of bitcode).
=back
=head1 EXIT STATUS
If B<llvm-extract> succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value.
=head1 SEE ALSO
L<bugpoint|bugpoint>
=head1 AUTHORS
Maintained by the LLVM Team (L<http://llvm.org/>).
=cut
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