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.TH "LLVM-EXTRACT" "1" "2018-08-02" "7" "LLVM"
.SH NAME
llvm-extract \- extract a function from an LLVM module
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.SH SYNOPSIS
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\fBllvm\-extract\fP [\fIoptions\fP] \fB\-\-func\fP \fIfunction\-name\fP [\fIfilename\fP]
.SH DESCRIPTION
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The \fBllvm\-extract\fP 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.
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In addition to extracting the bitcode of the specified function,
\fBllvm\-extract\fP will also remove unreachable global variables,
prototypes, and unused types.
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The \fBllvm\-extract\fP command reads its input from standard input if
filename is omitted or if filename is \fB\-\fP\&.  The output is always written to
standard output, unless the \fB\-o\fP option is specified (see below).
.SH OPTIONS
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\fB\-f\fP
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Enable binary output on terminals.  Normally, \fBllvm\-extract\fP will
refuse to write raw bitcode output if the output stream is a terminal.  With
this option, \fBllvm\-extract\fP will write raw bitcode regardless of the
output device.
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\fB\-\-func\fP \fIfunction\-name\fP
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.INDENT 3.5
Extract the function named \fIfunction\-name\fP from the LLVM bitcode.  May be
specified multiple times to extract multiple functions at once.
.UNINDENT
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\fB\-\-rfunc\fP \fIfunction\-regular\-expr\fP
.INDENT 0.0
.INDENT 3.5
Extract the function(s) matching \fIfunction\-regular\-expr\fP from the LLVM bitcode.
All functions matching the regular expression will be extracted.  May be
specified multiple times.
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\fB\-\-glob\fP \fIglobal\-name\fP
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.INDENT 3.5
Extract the global variable named \fIglobal\-name\fP from the LLVM bitcode.  May be
specified multiple times to extract multiple global variables at once.
.UNINDENT
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\fB\-\-rglob\fP \fIglob\-regular\-expr\fP
.INDENT 0.0
.INDENT 3.5
Extract the global variable(s) matching \fIglobal\-regular\-expr\fP from the LLVM
bitcode.  All global variables matching the regular expression will be
extracted.  May be specified multiple times.
.UNINDENT
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\fB\-help\fP
.INDENT 0.0
.INDENT 3.5
Print a summary of command line options.
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\fB\-o\fP \fIfilename\fP
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.INDENT 3.5
Specify the output filename.  If filename is "\-" (the default), then
\fBllvm\-extract\fP sends its output to standard output.
.UNINDENT
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\fB\-S\fP
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Write output in LLVM intermediate language (instead of bitcode).
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.SH EXIT STATUS
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If \fBllvm\-extract\fP succeeds, it will exit with 0.  Otherwise, if an error
occurs, it will exit with a non\-zero value.
.SH SEE ALSO
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bugpoint
.SH AUTHOR
Maintained by The LLVM Team (http://llvm.org/).
.SH COPYRIGHT
2003-2018, LLVM Project
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