[llvm-dev] FW: How to use -forder-file-instrumentation to generate order file for iOS Apps?

[Manman Ren via llvm-dev]

I don't think I wrote a doc on this.
'compiler-rt/test/profile/instrprof-order-file.test' shows how to use it,
build the app with -forder-file-instrumentation and -mllvm
-orderfile-write-mapping, then run the app, use the mapping file to decode
the profile.

The profile should be in default.profraw.order. But you can change its name
via:

- Writes to the file with the last name given to \a *
- __llvm_profile_set_filename(),
- or if it hasn't been called, the \c LLVM_PROFILE_FILE environment
variable,
- or if that's not set, the last name set to INSTR_PROF_PROFILE_NAME_VAR,
- or if that's not set,  \c "default.profraw".

Hope this helps!
Manman

On Thu, Sep 23, 2021 at 2:45 PM Manman Ren <mren at fb.com> wrote:

>
>
>
>
> *From: *Manman Ren <mren at fb.com>
> *Date: *Thursday, September 23, 2021 at 2:20 PM
> *To: *Jack Chen <jacklcc at google.com>, llvm-dev at lists.llvm.org <
> llvm-dev at lists.llvm.org>
> *Subject: *Re: How to use -forder-file-instrumentation to generate order
> file for iOS Apps?
>
> I don't think I wrote a doc on this.
> 'compiler-rt/test/profile/instrprof-order-file.test' shows how to use it,
> build the app with -forder-file-instrumentation and -mllvm
> -orderfile-write-mapping, then run the app, use the mapping file to decode
> the profile.
>
> The profile should be in default.profraw.order. But you can change its
> name via:
>
> - Writes to the file with the last name given to \a *
> - __llvm_profile_set_filename(),
> - or if it hasn't been called, the \c LLVM_PROFILE_FILE environment
> variable,
> - or if that's not set, the last name set to INSTR_PROF_PROFILE_NAME_VAR,
> - or if that's not set,  \c "default.profraw".
>
> Hope this helps!
> Manman
>
>
>
>
>
> *From: *Jack Chen <jacklcc at google.com>
> *Date: *Thursday, September 23, 2021 at 1:05 AM
> *To: *llvm-dev at lists.llvm.org <llvm-dev at lists.llvm.org>
> *Cc: *Manman Ren <mren at fb.com>
> *Subject: *How to use -forder-file-instrumentation to generate order file
> for iOS Apps?
>
> Hello llvm developers,
>
>
>
> I wonder how to use the flag *-forder-file-instrumentation* for iOS Apps
> written in objective-C and swift?
>
>
>
> I enabled the flags* -forder-file-instrumentation -mllvm
> -orderfile-write-mapping* *-fprofile-instr-generate *when building my iOS
> App, which is written in objective-C and swift.
>
> After running the App on the iOS simulator on my macbook, a profraw.order
> file is generated in the simulator's folder. However, the file doesn't
> contain the correct contents. It contains too few bytes, also most data
> blobs are 32 bits (I believe the right format is 64-bits MD5), and many of
> them are duplicated. FWIW, here are the first few bytes:
>
> 00000000: 70aa cb11 0100 0000 f8ac cb11 0100 0000  p...............
>
> 00000010: 90ab cb11 0100 0000 58aa cb11 0100 0000  ........X.......
>
> 00000020: ffff ffff 0000 0000 0000 0000 0000 0000  ................
>
> 00000030: 0000 0000 0000 0000 ffff ffff 0000 0000  ................
>
> 00000040: 0000 0000 0000 0000 0000 0000 0000 0000  ................
>
> 00000050: 0000 0000 0000 0000 0000 0000 0000 0000  ................
>
> 00000060: 0000 0000 0000 0000 0000 0000 0000 0000  ................
>
> 00000070: 0000 0000 0000 0000 0000 0000 0000 0000  ................
>
> 00000080: 0000 0000 0000 0000 0000 0000 0000 0000  ................
>
> I wonder if the feature *-forder-file-instrumentation *is supported for
> iOS Apps that are written in objective-C and swift?
>
> If yes, then I wonder what's the proper steps to use it?
>
>
>
> Thank you very much for your time.
>
>
>
> Regards,
>
> Jack
>
>
>
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