llvm dev - Nov 2012 - [LLVMdev] accessing personality and other exception related functions

Hi,


in ExceptionDemo code (
https://llvm.org/viewvc/llvm-project/llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp?view=markup&sortby=file
) the function "ourPersonality" is defined. a llvm::Function is
created with the same name inside function
"createStandardUtilityFunctions". The llvm::Function is retrieved in
function "createCatchWrappedInvokeFunction". But nowhere i can find
where a mapping between the actual function address and this
llvm::Function is done, i was expecting to find some sort of
addGlobalMapping somewhere tying both ends, but i cannot find it.

So, my question is; is llvm::Module::getFunction resorting to some
local symbol binary search when the function is unmapped? how does it
find the actual "ourPersonality" function?

Would it work the same if i just replaced that name with
"__gxx_personality_v0"? or do i need to link my executable against
some library?

Hi Charles,
> in ExceptionDemo code (
>
https://llvm.org/viewvc/llvm-project/llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp?view=markup&sortby=file
> ) the function "ourPersonality" is defined. a llvm::Function is
> created with the same name inside function
> "createStandardUtilityFunctions". The llvm::Function is retrieved
in
> function "createCatchWrappedInvokeFunction". But nowhere i can
find
> where a mapping between the actual function address and this
> llvm::Function is done, i was expecting to find some sort of
> addGlobalMapping somewhere tying both ends, but i cannot find it.
>
> So, my question is; is llvm::Module::getFunction resorting to some
> local symbol binary search when the function is unmapped? how does it
> find the actual "ourPersonality" function?
>
> Would it work the same if i just replaced that name with
> "__gxx_personality_v0"? or do i need to link my executable
against
> some library?
it assumes you are linking against a library that provides the personality
function.  In your case that means linking against libstdc++ IIRC.

Ciao, Duncan.