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download PDF document: llvm-extract15.1.pdf

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-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
--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 2003-2023, LLVM Project
15 2023-12-15 LLVM-EXTRACT(1)