Gaier, Bjoern via llvm-dev
2019-Jan-22 06:52 UTC
[llvm-dev] Windows JIT-Client and Emulated TLS
Hello LLVM-World,
yeah... It's me again and still with the never ending (but cool) task of
jitting BC files under windows.
My setup is: LLVM 7.0.0, with the corresponding Clang, Visual Studio 2017 (Clang
integrated via "vix" installer) and my target is also windows x64.
I create BC files with clang-cl and have currently a new test code, which has a
static variable inside a lambda function. This lambda function returns the
address of this said variable.
As mention this code is compiled with clang-cl for windows in 64bit, generating
a BC file.
When loading this file with my JIT-Client I get some undefined references which
I could resolve - besides from two:
"__emutls_get_address" and "__emutls_v.xyz_" (xyz is just a
place holder - don't remember what was written there)
I tried researching a bit and... I think this functions are related to emulating
TLS?
So I look into the IR file but noticed that these function where not mentioned
there. So I assumed they must be created by the JIT process, so I went there and
looked for my "llvm::TargetOptions" and set these values explicit:
options.ThreadModel = llvm::ThreadModel::Single;
options.EmulatedTLS = false;
options.ExplicitEmulatedTLS = false;
Sadly this didn't changed a thing... Also setting "-Xclang
-fno-emulated-tls" didn't worked, only setting the MSVC switch
"/Zc:threadSafeInit-" helped but... obviously disabled TLS at all.
What options do I have? I found an implementation for
"__emutls_get_address" in compiler-rt but no explanation what I should
do with these "__emutls_v."-functions. Further, can't I just
disable emulated-tls? My JIT-Client seemed to have ignored my wish...
I hope someone can help me with that :0
I'm still a beginner so... sorry for this question
Kind greetings and thank you
Björn
Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr.
DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus
Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika
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David Major via llvm-dev
2019-Jan-22 14:40 UTC
[llvm-dev] Windows JIT-Client and Emulated TLS
> options.EmulatedTLS = false; > options.ExplicitEmulatedTLS = false;It looks like you'll need to set ExplicitEmulatedTLS to true, in order to say "I am making an explicit choice about options.EmulatedTLS": https://github.com/llvm/llvm-project/blob/master/llvm/lib/Target/TargetMachine.cpp#L205 On Tue, Jan 22, 2019 at 1:52 AM Gaier, Bjoern via llvm-dev <llvm-dev at lists.llvm.org> wrote:> > Hello LLVM-World, > > > > yeah... It's me again and still with the never ending (but cool) task of jitting BC files under windows. > > My setup is: LLVM 7.0.0, with the corresponding Clang, Visual Studio 2017 (Clang integrated via "vix" installer) and my target is also windows x64. > > > > I create BC files with clang-cl and have currently a new test code, which has a static variable inside a lambda function. This lambda function returns the address of this said variable. > > As mention this code is compiled with clang-cl for windows in 64bit, generating a BC file. > > > > When loading this file with my JIT-Client I get some undefined references which I could resolve - besides from two: > > "__emutls_get_address" and "__emutls_v.xyz_" (xyz is just a place holder - don't remember what was written there) > > > > I tried researching a bit and... I think this functions are related to emulating TLS? > > > > So I look into the IR file but noticed that these function where not mentioned there. So I assumed they must be created by the JIT process, so I went there and looked for my "llvm::TargetOptions" and set these values explicit: > > options.ThreadModel = llvm::ThreadModel::Single; > > options.EmulatedTLS = false; > > options.ExplicitEmulatedTLS = false; > > > > Sadly this didn't changed a thing... Also setting "-Xclang -fno-emulated-tls" didn't worked, only setting the MSVC switch "/Zc:threadSafeInit-" helped but... obviously disabled TLS at all. > > > > What options do I have? I found an implementation for "__emutls_get_address" in compiler-rt but no explanation what I should do with these "__emutls_v."-functions. Further, can't I just disable emulated-tls? My JIT-Client seemed to have ignored my wish... > > > > I hope someone can help me with that :0 > > I'm still a beginner so... sorry for this question > > > > Kind greetings and thank you > > Björn > > Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr. DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
Gaier, Bjoern via llvm-dev
2019-Jan-23 06:26 UTC
[llvm-dev] Windows JIT-Client and Emulated TLS
That sadly didn't helped... the functions are still generated... -----Original Message----- From: David Major <dmajor at mozilla.com> Sent: Dienstag, 22. Januar 2019 15:40 To: Gaier, Bjoern <Bjoern.Gaier at horiba.com> Cc: llvm-dev <llvm-dev at lists.llvm.org> Subject: Re: [llvm-dev] Windows JIT-Client and Emulated TLS> options.EmulatedTLS = false; > options.ExplicitEmulatedTLS = false;It looks like you'll need to set ExplicitEmulatedTLS to true, in order to say "I am making an explicit choice about options.EmulatedTLS": https://github.com/llvm/llvm-project/blob/master/llvm/lib/Target/TargetMachine.cpp#L205 On Tue, Jan 22, 2019 at 1:52 AM Gaier, Bjoern via llvm-dev <llvm-dev at lists.llvm.org> wrote:> > Hello LLVM-World, > > > > yeah... It's me again and still with the never ending (but cool) task of jitting BC files under windows. > > My setup is: LLVM 7.0.0, with the corresponding Clang, Visual Studio 2017 (Clang integrated via "vix" installer) and my target is also windows x64. > > > > I create BC files with clang-cl and have currently a new test code, which has a static variable inside a lambda function. This lambda function returns the address of this said variable. > > As mention this code is compiled with clang-cl for windows in 64bit, generating a BC file. > > > > When loading this file with my JIT-Client I get some undefined references which I could resolve - besides from two: > > "__emutls_get_address" and "__emutls_v.xyz_" (xyz is just a place > holder - don't remember what was written there) > > > > I tried researching a bit and... I think this functions are related to emulating TLS? > > > > So I look into the IR file but noticed that these function where not mentioned there. So I assumed they must be created by the JIT process, so I went there and looked for my "llvm::TargetOptions" and set these values explicit: > > options.ThreadModel > llvm::ThreadModel::Single; > > options.EmulatedTLS = false; > > options.ExplicitEmulatedTLS = false; > > > > Sadly this didn't changed a thing... Also setting "-Xclang -fno-emulated-tls" didn't worked, only setting the MSVC switch "/Zc:threadSafeInit-" helped but... obviously disabled TLS at all. > > > > What options do I have? I found an implementation for "__emutls_get_address" in compiler-rt but no explanation what I should do with these "__emutls_v."-functions. Further, can't I just disable emulated-tls? My JIT-Client seemed to have ignored my wish... > > > > I hope someone can help me with that :0 > > I'm still a beginner so... sorry for this question > > > > Kind greetings and thank you > > Björn > > Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, > USt.ID-Nr. DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. > Robert Plank, Markus Bode, Heiko Lampert, Takashi Nagano, Takeshi > Fukushima. Junichi Tajika > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-devAls GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr. DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika