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92f700c60b
Summary:
This adds -keep-const-init option to llvm-extract which preserves initializers of
used global constants.
For example:
```
$ cat a.ll
@g = constant i32 0
define i32 @f() {
%v = load i32, i32* @g
ret i32 %v
}
$ llvm-extract --func=f a.ll -S -o -
@g = external constant i32
define i32 @f() { .. }
$ llvm-extract --func=f a.ll -keep-const-init -S -o -
@g = constant i32 0
define i32 @f() { .. }
```
This option is useful in checking whether a function that uses a constant global is optimized correctly.
Reviewers: jsji, MaskRay, david2050
Reviewed By: MaskRay
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D73833
85 lines
2.4 KiB
ReStructuredText
85 lines
2.4 KiB
ReStructuredText
llvm-extract - extract a function from an LLVM module
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=====================================================
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.. program:: llvm-extract
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SYNOPSIS
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--------
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:program:`llvm-extract` [*options*] **--func** *function-name* [*filename*]
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DESCRIPTION
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-----------
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The :program:`llvm-extract` command takes the name of a function and extracts
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it from the specified LLVM bitcode file. It is primarily used as a debugging
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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,
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:program:`llvm-extract` will also remove unreachable global variables,
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prototypes, and unused types.
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The :program:`llvm-extract` command reads its input from standard input if
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filename is omitted or if filename is ``-``. The output is always written to
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standard output, unless the **-o** option is specified (see below).
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OPTIONS
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-------
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**-f**
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Enable binary output on terminals. Normally, :program:`llvm-extract` will
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refuse to write raw bitcode output if the output stream is a terminal. With
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this option, :program:`llvm-extract` will write raw bitcode regardless of the
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output device.
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**--func** *function-name*
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Extract the function named *function-name* from the LLVM bitcode. May be
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specified multiple times to extract multiple functions at once.
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**--rfunc** *function-regular-expr*
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Extract the function(s) matching *function-regular-expr* from the LLVM bitcode.
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All functions matching the regular expression will be extracted. May be
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specified multiple times.
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**--glob** *global-name*
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Extract the global variable named *global-name* from the LLVM bitcode. May be
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specified multiple times to extract multiple global variables at once.
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**--rglob** *glob-regular-expr*
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Extract the global variable(s) matching *global-regular-expr* from the LLVM
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bitcode. All global variables matching the regular expression will be
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extracted. May be specified multiple times.
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**--keep-const-init**
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Preserve the values of constant globals.
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**-help**
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Print a summary of command line options.
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**-o** *filename*
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Specify the output filename. If filename is "-" (the default), then
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:program:`llvm-extract` sends its output to standard output.
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**-S**
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Write output in LLVM intermediate language (instead of bitcode).
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EXIT STATUS
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-----------
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If :program:`llvm-extract` succeeds, it will exit with 0. Otherwise, if an error
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occurs, it will exit with a non-zero value.
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SEE ALSO
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--------
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:manpage:`bugpoint(1)`
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