1llvm-extract - extract a function from an LLVM module 2===================================================== 3 4.. program:: llvm-extract 5 6SYNOPSIS 7-------- 8 9:program:`llvm-extract` [*options*] **--func** *function-name* [*filename*] 10 11DESCRIPTION 12----------- 13 14The :program:`llvm-extract` command takes the name of a function and extracts 15it from the specified LLVM bitcode file. It is primarily used as a debugging 16tool to reduce test cases from larger programs that are triggering a bug. 17 18In addition to extracting the bitcode of the specified function, 19:program:`llvm-extract` will also remove unreachable global variables, 20prototypes, and unused types. 21 22The :program:`llvm-extract` command reads its input from standard input if 23filename is omitted or if filename is ``-``. The output is always written to 24standard output, unless the **-o** option is specified (see below). 25 26OPTIONS 27------- 28 29**--alias** *alias-name* 30 31 Extract the alias named *function-name* from the LLVM bitcode. May be 32 specified multiple times to extract multiple alias at once. 33 34**--ralias** *alias-regular-expr* 35 36 Extract the alias matching *alias-regular-expr* from the LLVM bitcode. 37 All alias matching the regular expression will be extracted. May be 38 specified multiple times. 39 40**--bb** *basic-block-specifier* 41 42 Extract basic blocks(s) specified in *basic-block-specifier*. May be 43 specified multiple times. Each <function:bb[;bb]> specifier pair will create 44 a function. If multiple basic blocks are specified in one pair, the first 45 block in the sequence should dominate the rest. 46 47**--delete** 48 49 Delete specified Globals from Module. 50 51**-f** 52 53 Enable binary output on terminals. Normally, :program:`llvm-extract` will 54 refuse to write raw bitcode output if the output stream is a terminal. With 55 this option, :program:`llvm-extract` will write raw bitcode regardless of the 56 output device. 57 58**--func** *function-name* 59 60 Extract the function named *function-name* from the LLVM bitcode. May be 61 specified multiple times to extract multiple functions at once. 62 63**--rfunc** *function-regular-expr* 64 65 Extract the function(s) matching *function-regular-expr* from the LLVM bitcode. 66 All functions matching the regular expression will be extracted. May be 67 specified multiple times. 68 69**--glob** *global-name* 70 71 Extract the global variable named *global-name* from the LLVM bitcode. May be 72 specified multiple times to extract multiple global variables at once. 73 74**--rglob** *glob-regular-expr* 75 76 Extract the global variable(s) matching *global-regular-expr* from the LLVM 77 bitcode. All global variables matching the regular expression will be 78 extracted. May be specified multiple times. 79 80**--keep-const-init** 81 82 Preserve the values of constant globals. 83 84**--recursive** 85 86 Recursively extract all called functions 87 88**-help** 89 90 Print a summary of command line options. 91 92**-o** *filename* 93 94 Specify the output filename. If filename is "-" (the default), then 95 :program:`llvm-extract` sends its output to standard output. 96 97**-S** 98 99 Write output in LLVM intermediate language (instead of bitcode). 100 101EXIT STATUS 102----------- 103 104If :program:`llvm-extract` succeeds, it will exit with 0. Otherwise, if an error 105occurs, it will exit with a non-zero value. 106 107SEE ALSO 108-------- 109 110:manpage:`bugpoint(1)` 111