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TLS is currently not suppored in the JIT on some platforms.
However, it's possible to enable emulated TLS support in LLVM
which means that we now support TLS across many architectures.
The performance downsides of this are the overhead of accessing
the variable due to the additional indirection by the emulation.
However, this overhead is minimal and shouldn't affect most
programs. It also can be easily worked around from the user side.
This can be donefFor example by wrapping TLS variables into a single
TLS struct variable that then contains the other variables. Or just
minimizing referencing the TLS variable and use a normal copy of
the variable instead and write it back later.
Patch created with a lot of help from Lang Hames and Pavel Labath!
This is in prepare for the upcoming llvm upgrade. The future orc jit compile
layer needs a std::shared_ptr<llvm::Module>. The current design passes a
llvm::Module* around and any conversions to a shared_ptr cause the
destruction of the llvm::Module which is a long-lived object in cling.
This fixes a PyROOT performance regression between 6.02 and 6.04, seen by ATLAS.
(cherry picked from commit ba4b0df02a91be4102e62fc76038711d188f07f3)
Conflicts:
interpreter/cling/lib/Interpreter/Value.cpp
This prevents:
==4150== Possible data race during write of size 8 at 0xCC136F0 by thread #3
==4150== Locks held: none
==4150== at 0x146EC214: llvm::SmallVectorTemplateBase<cling::IncrementalExecutor::CXAAtExitElement, false>::grow(unsigned long) (in /afs/cern.ch/cms/sw/ReleaseCandidates/volB/slc6_amd64_gcc491/lcg/root/6.02.00-lnjiaj2/lib/libCling.so)
==4150== by 0x146E9DE3: cling::IncrementalExecutor::AddAtExitFunc(void (*)(void*), void*, cling::Transaction const*) (in /afs/cern.ch/cms/sw/ReleaseCandidates/volB/slc6_amd64_gcc491/lcg/root/6.02.00-lnjiaj2/lib/libCling.so)
==4150== by 0x160A5044: ???
==4150== by 0x160A67D6: ???
==4150== by 0x160A6783: ???
==4150== by 0x145E76D3: TCling::ExecuteWithArgsAndReturn(TMethod*, void*, void const**, int, void*) const (in /afs/cern.ch/cms/sw/ReleaseCandidates/volB/slc6_amd64_gcc491/lcg/root/6.02.00-lnjiaj2/lib/libCling.so)
Conflicts:
interpreter/cling/lib/Interpreter/IncrementalExecutor.cpp
