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.\" ========================================================================
.\"
.IX Title "LLVM-EXTRACT 1"
.TH LLVM-EXTRACT 1 "2011-10-17" "LLVM 3.0" "LLVM Command Guide"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
llvm\-extract \- extract a function from an LLVM module
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBllvm-extract\fR [\fIoptions\fR] \fB\-\-func\fR \fIfunction-name\fR [\fIfilename\fR]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBllvm-extract\fR command takes the name of a function and extracts it from
the specified \s-1LLVM\s0 bitcode file. It is primarily used as a debugging tool to
reduce test cases from larger programs that are triggering a bug.
.PP
In addition to extracting the bitcode of the specified function,
\&\fBllvm-extract\fR will also remove unreachable global variables, prototypes, and
unused types.
.PP
The \fBllvm-extract\fR 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 \fB\-o\fR option is specified (see below).
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-f\fR" 4
.IX Item "-f"
Enable binary output on terminals. Normally, \fBllvm-extract\fR will refuse to
write raw bitcode output if the output stream is a terminal. With this option,
\&\fBllvm-extract\fR will write raw bitcode regardless of the output device.
.IP "\fB\-\-func\fR \fIfunction-name\fR" 4
.IX Item "--func function-name"
Extract the function named \fIfunction-name\fR from the \s-1LLVM\s0 bitcode. May be
specified multiple times to extract multiple functions at once.
.IP "\fB\-\-rfunc\fR \fIfunction-regular-expr\fR" 4
.IX Item "--rfunc function-regular-expr"
Extract the function(s) matching \fIfunction-regular-expr\fR from the \s-1LLVM\s0 bitcode.
All functions matching the regular expression will be extracted. May be
specified multiple times.
.IP "\fB\-\-glob\fR \fIglobal-name\fR" 4
.IX Item "--glob global-name"
Extract the global variable named \fIglobal-name\fR from the \s-1LLVM\s0 bitcode. May be
specified multiple times to extract multiple global variables at once.
.IP "\fB\-\-rglob\fR \fIglob-regular-expr\fR" 4
.IX Item "--rglob glob-regular-expr"
Extract the global variable(s) matching \fIglobal-regular-expr\fR from the \s-1LLVM\s0
bitcode. All global variables matching the regular expression will be extracted.
May be specified multiple times.
.IP "\fB\-help\fR" 4
.IX Item "-help"
Print a summary of command line options.
.IP "\fB\-o\fR \fIfilename\fR" 4
.IX Item "-o filename"
Specify the output filename. If filename is \*(L"\-\*(R" (the default), then
\&\fBllvm-extract\fR sends its output to standard output.
.IP "\fB\-S\fR" 4
.IX Item "-S"
Write output in \s-1LLVM\s0 intermediate language (instead of bitcode).
.SH "EXIT STATUS"
.IX Header "EXIT STATUS"
If \fBllvm-extract\fR succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
bugpoint
.SH "AUTHORS"
.IX Header "AUTHORS"
Maintained by the \s-1LLVM\s0 Team (<http://llvm.org/>).
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