[llvm-dev] Error running clang++ generated bitcode in lli

[David Blaikie via llvm-dev]

I /think/ this might be because lli doesn't support global ctors (Lang -
can you confirm?) & so c++'s iostreams haven't been initialized. Maybe try
a C-style printf hello world, and maybe try printf printing in a global
ctor, see if that executes?

C style hello world is just generally simpler/doesn't need to exercise
quite so many complicated things as C++ iostream's hello world, so would be
a good place to start to narrow down the problem space in any case.

On Tue, Aug 24, 2021 at 5:01 PM Leer Laar via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I am trying to generate a bit code from a c++ source code and running it
> through the just-in-time compiler. When I compile through the clang++ and
> generate binary executable it runs perfectly but when I generated the
> bitcode and tried running through the JIT with lli command it generated a
> run-time error. Could you please help me understand what's going on.
>
> For example: Let example.cpp contains the following code:
>
>  #include <iostream>
>
>  int main(){
>     std::cout << "\nHello World!";
>     return 0;
>  }
>
> I am using the following command to generate executable which runs
> perfectly fine.
>
> clang++ example.cpp
>
> I am using the following command to generate the bitcode:
>
> clang++ -S -emit-llvm example.cpp
>
> And then running through the JIT using the following command which
> generates run-time error:
>
> lli example.ll
>
> I am getting the following access violation error:
>
> Stack dump:0.      Program arguments: lli example.ll
> #0 0x00000000025fd9af llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:0
> #1 0x00000000025fda42 PrintStackTraceSignalHandler(void*) /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Unix/Signals.inc:625:0
> #2 0x00000000025fb7ca llvm::sys::RunSignalHandlers() /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Signals.cpp:68:0
> #3 0x00000000025fd329 SignalHandler(int) /home/xpc/llvm/llvm-project1/llvm-project/llvm/lib/Support/Unix/Signals.inc:406:0
> #4 0x00007fa75dbdc390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)Segmentation fault (core dumped)
>
>
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