src/llvm/docs/CommandGuide/llvm-extract.rst

   1 llvm-extract - extract a function from an LLVM module
   2 =====================================================
   3
   4 SYNOPSIS
   5 --------
   6
   7 :program:`llvm-extract` [*options*] **--func** *function-name* [*filename*]
   8
   9 DESCRIPTION
  10 -----------
  11
  12 The :program:`llvm-extract` command takes the name of a function and extracts
  13 it from the specified LLVM bitcode file.  It is primarily used as a debugging
  14 tool to reduce test cases from larger programs that are triggering a bug.
  15
  16 In addition to extracting the bitcode of the specified function,
  17 :program:`llvm-extract` will also remove unreachable global variables,
  18 prototypes, and unused types.
  19
  20 The :program:`llvm-extract` command reads its input from standard input if
  21 filename is omitted or if filename is ``-``.  The output is always written to
  22 standard output, unless the **-o** option is specified (see below).
  23
  24 OPTIONS
  25 -------
  26
  27 **-f**
  28
  29  Enable binary output on terminals.  Normally, :program:`llvm-extract` will
  30  refuse to write raw bitcode output if the output stream is a terminal.  With
  31  this option, :program:`llvm-extract` will write raw bitcode regardless of the
  32  output device.
  33
  34 **--func** *function-name*
  35
  36  Extract the function named *function-name* from the LLVM bitcode.  May be
  37  specified multiple times to extract multiple functions at once.
  38
  39 **--rfunc** *function-regular-expr*
  40
  41  Extract the function(s) matching *function-regular-expr* from the LLVM bitcode.
  42  All functions matching the regular expression will be extracted.  May be
  43  specified multiple times.
  44
  45 **--glob** *global-name*
  46
  47  Extract the global variable named *global-name* from the LLVM bitcode.  May be
  48  specified multiple times to extract multiple global variables at once.
  49
  50 **--rglob** *glob-regular-expr*
  51
  52  Extract the global variable(s) matching *global-regular-expr* from the LLVM
  53  bitcode.  All global variables matching the regular expression will be
  54  extracted.  May be specified multiple times.
  55
  56 **-help**
  57
  58  Print a summary of command line options.
  59
  60 **-o** *filename*
  61
  62  Specify the output filename.  If filename is "-" (the default), then
  63  :program:`llvm-extract` sends its output to standard output.
  64
  65 **-S**
  66
  67  Write output in LLVM intermediate language (instead of bitcode).
  68
  69 EXIT STATUS
  70 -----------
  71
  72 If :program:`llvm-extract` succeeds, it will exit with 0.  Otherwise, if an error
  73 occurs, it will exit with a non-zero value.
  74
  75 SEE ALSO
  76 --------
  77
  78 bugpoint
  79