1LLVM-EXTRACT(1)                      LLVM                      LLVM-EXTRACT(1)
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NAME

6       llvm-extract - extract a function from an LLVM module
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SYNOPSIS

9       llvm-extract [options] --func function-name [filename]
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DESCRIPTION

12       The  llvm-extract  command takes the name of a function and extracts it
13       from the specified LLVM bitcode file.  It is primarily used as a debug‐
14       ging tool to reduce test cases from larger programs that are triggering
15       a bug.
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17       In addition to  extracting  the  bitcode  of  the  specified  function,
18       llvm-extract will also remove unreachable global variables, prototypes,
19       and unused types.
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21       The llvm-extract command reads its input from standard input  if  file‐
22       name  is  omitted or if filename is -.  The output is always written to
23       standard output, unless the -o option is specified (see below).
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OPTIONS

26       -f
27          Enable binary output  on  terminals.   Normally,  llvm-extract  will
28          refuse  to write raw bitcode output if the output stream is a termi‐
29          nal.  With this option, llvm-extract will write raw bitcode  regard‐
30          less of the output device.
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32       --func function-name
33          Extract the function named function-name from the LLVM bitcode.  May
34          be specified multiple times to extract multiple functions at once.
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36       --rfunc function-regular-expr
37          Extract the function(s) matching function-regular-expr from the LLVM
38          bitcode.   All functions matching the regular expression will be ex‐
39          tracted.  May be specified multiple times.
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41       --glob global-name
42          Extract the global variable named global-name from the LLVM bitcode.
43          May be specified multiple times to extract multiple global variables
44          at once.
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46       --rglob glob-regular-expr
47          Extract the global variable(s) matching global-regular-expr from the
48          LLVM  bitcode.  All global variables matching the regular expression
49          will be extracted.  May be specified multiple times.
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51       -help
52          Print a summary of command line options.
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54       -o filename
55          Specify the output filename.  If filename is "-" (the default), then
56          llvm-extract sends its output to standard output.
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58       -S
59          Write output in LLVM intermediate language (instead of bitcode).
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EXIT STATUS

62       If  llvm-extract succeeds, it will exit with 0.  Otherwise, if an error
63       occurs, it will exit with a non-zero value.
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SEE ALSO

66       bugpoint(1)
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AUTHOR

69       Maintained by the LLVM Team (https://llvm.org/).
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72       2003-2021, LLVM Project
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7710                                2021-07-22                   LLVM-EXTRACT(1)
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