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

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

       –ralias alias-regular-expr
          Extract  the  alias  matching  alias-regular-expr  from  the  LLVM  bitcode.  All alias
          matching the regular expression will be extracted.  May be specified multiple times.

       –bb basic-block-specifier
          Extract basic blocks(s) specified in basic-block-specifier. May be  specified  multiple
          times. Each <function:bb[;bb]> specifier pair will create a function. If multiple basic
          blocks are specified in one pair, the first block in the sequence should  dominate  the
          rest.

       –delete
          Delete specified Globals from Module.

       -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.

       –keep-const-init
          Preserve the values of constant globals.

       –recursive
          Recursively extract all called functions

       -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(1)

AUTHOR

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

COPYRIGHT

       2003-2022, LLVM Project