[llvm-dev] Windows JIT-Client and Emulated TLS (original) (raw)

David Major via llvm-dev llvm-dev at lists.llvm.org
Tue Jan 22 06:40:26 PST 2019

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: _"_emutlsgetaddress" and "emutlsv.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 "_emutlsgetaddress" in compiler-rt but no explanation what I should do with these "emutlsv."-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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