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LLVM-EXTRACT(1) LLVM LLVM-EXTRACT(1) 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-ex- tract 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 out- put, 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 spec- ified 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 out- put 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 ex- tracted. 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 oc- curs, it will exit with a non-zero value. SEE ALSO bugpoint(1) AUTHOR Maintained by the LLVM Team (https://llvm.org/). COPYRIGHT 2003-2026, LLVM Project 19 2026-07-30 LLVM-EXTRACT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | SEE ALSO | AUTHOR | COPYRIGHT
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