NAME

       llvm-extract - extract a function from an LLVM module

SYNOPSIS

       llvm-extract [options] –func function-name [filename]

DESCRIPTION

       The  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, llvm-extract will also
       remove unreachable global variables, prototypes, and unused types.

       The 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 -o option is
       specified (see below).

OPTIONS

       -f
          Enable binary output on terminals.  Normally, llvm-extract will  refuse  to  write  raw
          bitcode output if the output stream is a terminal.  With this option, llvm-extract will
          write raw bitcode regardless of the output device.

       –func function-name
          Extract the function named function-name from  the  LLVM  bitcode.   May  be  specified
          multiple times to extract multiple functions at once.

       –rfunc function-regular-expr
          Extract  the  function(s)  matching  function-regular-expr  from the LLVM bitcode.  All
          functions matching the regular expression will be extracted.  May be specified multiple
          times.

       –glob global-name
          Extract  the global variable named global-name from the LLVM bitcode.  May be specified
          multiple times to extract multiple global variables at once.

       –rglob glob-regular-expr
          Extract the global variable(s) matching global-regular-expr from the LLVM bitcode.  All
          global  variables  matching the regular expression will be extracted.  May be specified
          multiple times.

       -help
          Print a summary of command line options.

       -o filename
          Specify the output filename.  If filename is “-” (the default), then llvm-extract sends
          its output to standard output.

       -S
          Write output in LLVM intermediate language (instead of bitcode).

EXIT STATUS

       If  llvm-extract  succeeds,  it  will exit with 0.  Otherwise, if an error occurs, it will
       exit with a non-zero value.

SEE ALSO

       bugpoint

AUTHOR

       Maintained by the LLVM Team (https://llvm.org/).

COPYRIGHT

       2003-2020, LLVM Project