llvm dev - Nov 2011 - [LLVMdev] LLVM: to catch 'unwind' instruction from calling C++ code

Hi!

I have a little problem using LLVM and will be happy to get a solution. I
need to handle in C++ code an uncaught unwind instruction while calling JIT
(now I get segfault). I mean something like nonexistent
ExecutionEngine::invokeFunction instead of callFunction. Setting
llvm::JITExceptionHandling to true and enclosing the JIT-call within
try/catch block does not help here, because there is no C++ style exception
thrown, but a simple unwind instruction. Thanks in advance.
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Hi Semion, the unwind instruction has been removed from LLVM.  Also, the JIT
and code generators never supported it: it never unwound the stack, it just
resulted in a nasty crash.

Ciao, Duncan.
> I have a little problem using LLVM and will be happy to get a solution. I
need
> to handle in C++ code an uncaught unwind instruction while calling JIT (now
I
> get segfault). I mean something like nonexistent
ExecutionEngine::invokeFunction
> instead of callFunction. Setting llvm::JITExceptionHandling to true
> and enclosing the JIT-call within try/catch block does not help here,
because
> there is no C++ style exception thrown, but a simple unwind instruction.
Thanks
> in advance.
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

oops... so how can unwind stack up to invoke call? Is there an alternative
to establish a custom exception handling?

2011/11/7 Duncan Sands <baldrick at free.fr>
>
>> Hi Semion, the unwind instruction has been removed from LLVM.  Also,
the
>> JIT
>> and code generators never supported it: it never unwound the stack, it
>> just
>> resulted in a nasty crash.
>>
>> Ciao, Duncan.
>>
>> > I have a little problem using LLVM and will be happy to get a
solution.
>> I need
>> > to handle in C++ code an uncaught unwind instruction while calling
JIT
>> (now I
>> > get segfault). I mean something like nonexistent
>> ExecutionEngine::invokeFunction
>> > instead of callFunction. Setting llvm::JITExceptionHandling to
true
>> > and enclosing the JIT-call within try/catch block does not help
here,
>> because
>> > there is no C++ style exception thrown, but a simple unwind
>> instruction. Thanks
>> > in advance.
>> >
>> >
>> >
>> > _______________________________________________
>> > LLVM Developers mailing list
>> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
>
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Hi Semion,
> oops... so how can unwind stack up to invoke call? Is there an alternative
to
> establish a custom exception handling?
you can call a library routine, for example __cxa_throw (the C++ throw routine)
or the libgcc library routine _Unwind_RaiseException (which is what __cxa_throw
calls after setting up a C++ specific exception).

Ciao, Duncan.
>
>     2011/11/7 Duncan Sands <baldrick at free.fr <mailto:baldrick at
free.fr>>
>
>         Hi Semion, the unwind instruction has been removed from LLVM. 
Also, the JIT
>         and code generators never supported it: it never unwound the stack,
it just
>         resulted in a nasty crash.
>
>         Ciao, Duncan.
>
>          > I have a little problem using LLVM and will be happy to get a
>         solution. I need
>          > to handle in C++ code an uncaught unwind instruction while
calling
>         JIT (now I
>          > get segfault). I mean something like nonexistent
>         ExecutionEngine::invokeFunction
>          > instead of callFunction. Setting llvm::JITExceptionHandling
to true
>          > and enclosing the JIT-call within try/catch block does not
help here,
>         because
>          > there is no C++ style exception thrown, but a simple unwind
>         instruction. Thanks
>          > in advance.
>          >
>          >
>          >
>          > _______________________________________________
>          > LLVM Developers mailing list
>          > LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu>
http://llvm.cs.uiuc.edu
>          > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>         _______________________________________________
>         LLVM Developers mailing list
>         LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu>
http://llvm.cs.uiuc.edu
>         http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>