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annotate docs/CommandGuide/llvm-extract.rst @ 112:4b203247047d

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ignore TailCall failure in SelectionDAGBuilder (not Unreachable instruction)
author MitsukiMiyagi
date Mon, 07 Mar 2016 22:07:35 +0900
parents 95c75e76d11b
children c2174574ed3a
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1 llvm-extract - extract a function from an LLVM module
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2 =====================================================
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3
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4 SYNOPSIS
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5 --------
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7 :program:`llvm-extract` [*options*] **--func** *function-name* [*filename*]
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9 DESCRIPTION
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10 -----------
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12 The :program:`llvm-extract` command takes the name of a function and extracts
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13 it from the specified LLVM bitcode file. It is primarily used as a debugging
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14 tool to reduce test cases from larger programs that are triggering a bug.
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15
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16 In addition to extracting the bitcode of the specified function,
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17 :program:`llvm-extract` will also remove unreachable global variables,
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18 prototypes, and unused types.
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19
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20 The :program:`llvm-extract` command reads its input from standard input if
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21 filename is omitted or if filename is ``-``. The output is always written to
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22 standard output, unless the **-o** option is specified (see below).
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23
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24 OPTIONS
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25 -------
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27 **-f**
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28
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29 Enable binary output on terminals. Normally, :program:`llvm-extract` will
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30 refuse to write raw bitcode output if the output stream is a terminal. With
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31 this option, :program:`llvm-extract` will write raw bitcode regardless of the
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32 output device.
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33
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34 **--func** *function-name*
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35
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36 Extract the function named *function-name* from the LLVM bitcode. May be
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37 specified multiple times to extract multiple functions at once.
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38
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39 **--rfunc** *function-regular-expr*
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40
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41 Extract the function(s) matching *function-regular-expr* from the LLVM bitcode.
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42 All functions matching the regular expression will be extracted. May be
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43 specified multiple times.
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44
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45 **--glob** *global-name*
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46
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47 Extract the global variable named *global-name* from the LLVM bitcode. May be
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48 specified multiple times to extract multiple global variables at once.
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49
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50 **--rglob** *glob-regular-expr*
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51
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52 Extract the global variable(s) matching *global-regular-expr* from the LLVM
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53 bitcode. All global variables matching the regular expression will be
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54 extracted. May be specified multiple times.
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55
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56 **-help**
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57
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58 Print a summary of command line options.
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59
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60 **-o** *filename*
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61
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62 Specify the output filename. If filename is "-" (the default), then
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63 :program:`llvm-extract` sends its output to standard output.
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64
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65 **-S**
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66
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67 Write output in LLVM intermediate language (instead of bitcode).
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68
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69 EXIT STATUS
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70 -----------
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71
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72 If :program:`llvm-extract` succeeds, it will exit with 0. Otherwise, if an error
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73 occurs, it will exit with a non-zero value.
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74
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75 SEE ALSO
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76 --------
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78 bugpoint
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79