1LLVM-EXTRACT(1)                      LLVM                      LLVM-EXTRACT(1)
2
3
4

NAME

6       llvm-extract - extract a function from an LLVM module
7

SYNOPSIS

9       llvm-extract [options] --func function-name [filename]
10

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.
16
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.
20
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).
24

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.
29
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.
34
35       --bb basic-block-specifier
36          Extract  basic  blocks(s) specified 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.
40
41       --delete
42          Delete specified Globals from Module.
43
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.
49
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.
53
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 ex‐
57          tracted.  May be specified multiple times.
58
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.
63
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.
68
69       --keep-const-init
70          Preserve the values of constant globals.
71
72       --recursive
73          Recursively extract all called functions
74
75       -help
76          Print a summary of command line options.
77
78       -o filename
79          Specify the output filename.  If filename is "-" (the default), then
80          llvm-extract sends its output to standard output.
81
82       -S
83          Write output in LLVM intermediate language (instead of bitcode).
84

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.
88

SEE ALSO

90       bugpoint(1)
91

AUTHOR

93       Maintained by the LLVM Team (https://llvm.org/).
94

96       2003-2023, LLVM Project
97
98
99
100
10115                                2023-03-27                   LLVM-EXTRACT(1)
Impressum