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       --alias alias-name
27          Extract the alias named function-name from the LLVM bitcode.  May be
28          specified multiple times to extract multiple alias at once.
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30       --ralias alias-regular-expr
31          Extract the alias matching alias-regular-expr from the LLVM bitcode.
32          All alias matching the regular expression will be extracted.  May be
33          specified multiple times.
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35       --bb basic-block-specifier
36          Extract basic blocks(s) specicified in basic-block-specifier. May be
37          specified multiple times.  Each  <function:bb[;bb]>  specifier  pair
38          will  create  a  function. If multiple basic blocks are specified in
39          one pair, the first block in the sequence should dominate the rest.
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41       --delete
42          Delete specified Globals from Module.
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44       -f
45          Enable binary output  on  terminals.   Normally,  llvm-extract  will
46          refuse  to write raw bitcode output if the output stream is a termi‐
47          nal.  With this option, llvm-extract will write raw bitcode  regard‐
48          less of the output device.
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50       --func function-name
51          Extract the function named function-name from the LLVM bitcode.  May
52          be specified multiple times to extract multiple functions at once.
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54       --rfunc function-regular-expr
55          Extract the function(s) matching function-regular-expr from the LLVM
56          bitcode.   All  functions  matching  the  regular expression will be
57          extracted.  May be specified multiple times.
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59       --glob global-name
60          Extract the global variable named global-name from the LLVM bitcode.
61          May be specified multiple times to extract multiple global variables
62          at once.
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64       --rglob glob-regular-expr
65          Extract the global variable(s) matching global-regular-expr from the
66          LLVM  bitcode.  All global variables matching the regular expression
67          will be extracted.  May be specified multiple times.
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69       --keep-const-init
70          Preserve the values of constant globals.
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72       --recursive
73          Recursively extract all called functions
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75       -help
76          Print a summary of command line options.
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78       -o filename
79          Specify the output filename.  If filename is "-" (the default), then
80          llvm-extract sends its output to standard output.
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82       -S
83          Write output in LLVM intermediate language (instead of bitcode).
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EXIT STATUS

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

90       bugpoint(1)
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AUTHOR

93       Maintained by the LLVM Team (https://llvm.org/).
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96       2003-2020, LLVM Project
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10111                                2020-10-15                   LLVM-EXTRACT(1)
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