This had also came up at llvm-devmtg briefly at the JIT roundtable. One of the collaborators on my project had started a patch years ago to implement some of it https://reviews.llvm.org/D8815, but then we went a different direction with TLS in our frontend and it became unnecessary. On Fri, Dec 20, 2019 at 12:36 PM David Blaikie via llvm-dev < llvm-dev at lists.llvm.org> wrote:> +Lang for visibility > > On Fri, Dec 20, 2019 at 5:09 AM Geoff Levner via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> I am in the process of porting our ORC code to ORC v2 and LLJIT. Now that >> I have worked around a problem getting global constructors to be called, >> everything seems to work unless a module declares a static thread-local >> variable. In that case I get a "JIT session error" saying that the symbol __ >> emutls_v.xyz was not found (substitute the mangled variable name for >> "xyz"). >> >> Does that mean anything to anybody out there? >> >> (I don't know if it's relevant, but we are using LLVM 8, and we are using >> Clang to compile C++ modules that are all put into a single JITDylib.) >> >> Geoff >> _______________________________________________ >> LLVM Developers mailing list >> llvm-dev at lists.llvm.org >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >> > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20191220/f41854cc/attachment.html>
Praveen Velliengiri via llvm-dev
2019-Dec-20 18:17 UTC
[llvm-dev] LLJIT vs. thread-local storage
Hi Jameson, Why thread local support is hard to support in JITs? Whether Julia supports Thread locals? If so, it would be very much helpful to know how. Thanks On Fri, 20 Dec 2019 at 23:31, Jameson Nash via llvm-dev < llvm-dev at lists.llvm.org> wrote:> This had also came up at llvm-devmtg briefly at the JIT roundtable. One of > the collaborators on my project had started a patch years ago to implement > some of it https://reviews.llvm.org/D8815, but then we went a different > direction with TLS in our frontend and it became unnecessary. > > On Fri, Dec 20, 2019 at 12:36 PM David Blaikie via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> +Lang for visibility >> >> On Fri, Dec 20, 2019 at 5:09 AM Geoff Levner via llvm-dev < >> llvm-dev at lists.llvm.org> wrote: >> >>> I am in the process of porting our ORC code to ORC v2 and LLJIT. Now >>> that I have worked around a problem getting global constructors to be >>> called, everything seems to work unless a module declares a static >>> thread-local variable. In that case I get a "JIT session error" saying that >>> the symbol __emutls_v.xyz was not found (substitute the mangled >>> variable name for "xyz"). >>> >>> Does that mean anything to anybody out there? >>> >>> (I don't know if it's relevant, but we are using LLVM 8, and we are >>> using Clang to compile C++ modules that are all put into a single JITDylib.) >>> >>> Geoff >>> _______________________________________________ >>> LLVM Developers mailing list >>> llvm-dev at lists.llvm.org >>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >>> >> _______________________________________________ >> LLVM Developers mailing list >> llvm-dev at lists.llvm.org >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >> > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20191220/62c7e17a/attachment.html>
I don't think it's especially hard, but just not specifically unimplemented because nobody's had a strong need for it. There's probably some combinations of code models and machines that does happen to work (e.g. emutls+linux+large-code+large-data+no-PIC). Julia has some support for thread locals, but as a JIT in control of the language we currently try to generate better code than would otherwise happen (often bits of inline assembly that's more similar to the initial-exec model than a dynamic library would normally be able to use)—but also with more limitations on how it may be used and requiring some additional support from the runtime. On Fri, Dec 20, 2019 at 1:17 PM Praveen Velliengiri < praveenvelliengiri at gmail.com> wrote:> Hi Jameson, > Why thread local support is hard to support in JITs? Whether Julia > supports Thread locals? If so, it would be very much helpful to know how. > > Thanks > > On Fri, 20 Dec 2019 at 23:31, Jameson Nash via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> This had also came up at llvm-devmtg briefly at the JIT roundtable. One >> of the collaborators on my project had started a patch years ago to >> implement some of it https://reviews.llvm.org/D8815, but then we went a >> different direction with TLS in our frontend and it became unnecessary. >> >> On Fri, Dec 20, 2019 at 12:36 PM David Blaikie via llvm-dev < >> llvm-dev at lists.llvm.org> wrote: >> >>> +Lang for visibility >>> >>> On Fri, Dec 20, 2019 at 5:09 AM Geoff Levner via llvm-dev < >>> llvm-dev at lists.llvm.org> wrote: >>> >>>> I am in the process of porting our ORC code to ORC v2 and LLJIT. Now >>>> that I have worked around a problem getting global constructors to be >>>> called, everything seems to work unless a module declares a static >>>> thread-local variable. In that case I get a "JIT session error" saying that >>>> the symbol __emutls_v.xyz was not found (substitute the mangled >>>> variable name for "xyz"). >>>> >>>> Does that mean anything to anybody out there? >>>> >>>> (I don't know if it's relevant, but we are using LLVM 8, and we are >>>> using Clang to compile C++ modules that are all put into a single JITDylib.) >>>> >>>> Geoff >>>> _______________________________________________ >>>> LLVM Developers mailing list >>>> llvm-dev at lists.llvm.org >>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >>>> >>> _______________________________________________ >>> LLVM Developers mailing list >>> llvm-dev at lists.llvm.org >>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >>> >> _______________________________________________ >> LLVM Developers mailing list >> llvm-dev at lists.llvm.org >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >> >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20191220/b112b285/attachment.html>
Joerg Sonnenberger via llvm-dev
2019-Dec-21 00:16 UTC
[llvm-dev] LLJIT vs. thread-local storage
On Fri, Dec 20, 2019 at 11:47:15PM +0530, Praveen Velliengiri via llvm-dev wrote:> Hi Jameson, > Why thread local support is hard to support in JITs? Whether Julia supports > Thread locals? If so, it would be very much helpful to know how.TLS is normally handled somewhere between libc and dynamic linker. There is currently no defined interface for requested another TLS segment or just static TLS space. Joerg