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PROGRAM:

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.

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