llvm-extract man page

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 (http://llvm.org/).

Info

2017-09-19 4 LLVM