llvm-extract - extract a function from an LLVM module ===================================================== .. program:: llvm-extract SYNOPSIS -------- :program:`llvm-extract` [*options*] **--func** *function-name* [*filename*] DESCRIPTION ----------- The :program:`llvm-extract` command takes the name of a function and extracts it from the specified LLVM bitcode file. It is primarily used as a debugging tool to reduce test cases from larger programs that are triggering a bug. In addition to extracting the bitcode of the specified function, :program:`llvm-extract` will also remove unreachable global variables, prototypes, and unused types. The :program:`llvm-extract` command reads its input from standard input if filename is omitted or if filename is ``-``. The output is always written to standard output, unless the **-o** option is specified (see below). OPTIONS ------- **--alias** *alias-name* Extract the alias named *function-name* from the LLVM bitcode. May be specified multiple times to extract multiple alias at once. **--ralias** *alias-regular-expr* Extract the alias matching *alias-regular-expr* from the LLVM bitcode. All alias matching the regular expression will be extracted. May be specified multiple times. **--bb** *basic-block-specifier* Extract basic blocks(s) specified in *basic-block-specifier*. May be specified multiple times. Each <function:bb[;bb]> specifier pair will create a function. If multiple basic blocks are specified in one pair, the first block in the sequence should dominate the rest. **--delete** Delete specified Globals from Module. **-f** Enable binary output on terminals. Normally, :program:`llvm-extract` will refuse to write raw bitcode output if the output stream is a terminal. With this option, :program:`llvm-extract` will write raw bitcode regardless of the output device. **--func** *function-name* Extract the function named *function-name* from the LLVM bitcode. May be specified multiple times to extract multiple functions at once. **--rfunc** *function-regular-expr* Extract the function(s) matching *function-regular-expr* from the LLVM bitcode. All functions matching the regular expression will be extracted. May be specified multiple times. **--glob** *global-name* Extract the global variable named *global-name* from the LLVM bitcode. May be specified multiple times to extract multiple global variables at once. **--rglob** *glob-regular-expr* Extract the global variable(s) matching *global-regular-expr* from the LLVM bitcode. All global variables matching the regular expression will be extracted. May be specified multiple times. **--keep-const-init** Preserve the values of constant globals. **--recursive** Recursively extract all called functions **-help** Print a summary of command line options. **-o** *filename* Specify the output filename. If filename is "-" (the default), then :program:`llvm-extract` sends its output to standard output. **-S** Write output in LLVM intermediate language (instead of bitcode). EXIT STATUS ----------- If :program:`llvm-extract` succeeds, it will exit with 0. Otherwise, if an error occurs, it will exit with a non-zero value. SEE ALSO -------- :manpage:`bugpoint(1)`
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