[LLVMdev] Exception Tables in latest LLVM

[Duncan Sands]

Hi Yiannis,

> I have been using llvm 2.8 (i know ancient history!) for a backend that i was
> implementing. I have been trying to port my patches to latest llvm (svn build)
> lately but i have one problem as far as the Exception Handling mechanism is
> concerned. It seems that there are no Exception Tables generated any more such
> as the one below:

got some example bitcode for which you see this (or, rather, don't see this
since the problem is that you are not seeing exception tables)?

Ciao, Duncan.

>
> .section    .gcc_except_table,"a", at progbits
>      .align    4
> GCC_except_table0:
> .Lexception0:
>      .byte    255                     # @LPStart Encoding = omit
>      .byte    3                       # @TType Encoding = udata4
>      .uleb128    41              # @TType base offset
>      .byte    3                       # Call site Encoding = udata4
>      .uleb128    39              # Call site table length
> .Lset0 = .Leh_func_begin0-.Leh_func_begin0 # Region start
>      .long    .Lset0
> .Lset1 = .Ltmp0-.Leh_func_begin0        # Region length
>      .long    .Lset1
>      .long    0                       # Landing pad
>      .uleb128    0               # Action
> .Lset2 = .Ltmp0-.Leh_func_begin0        # Region start
>      .long    .Lset2
> .Lset3 = .Ltmp1-.Ltmp0                  # Region length
>      .long    .Lset3
> .Lset4 = .Ltmp2-.Leh_func_begin0        # Landing pad
>      .long    .Lset4
>      .uleb128    0               # Action
> .Lset5 = .Ltmp1-.Leh_func_begin0        # Region start
>      .long    .Lset5
> .Lset6 = .Leh_func_end0-.Ltmp1          # Region length
>      .long    .Lset6
>      .long    0                       # Landing pad
>      .uleb128    0               # Action
>      .align    4
>
>
> I've searched for this  but i couldn't find some documentation about the changes
> in the EH staff and the documentation on the website is not complete... Is there
> any way i can force the generation of these tables in current LLVM?
>
> Thanks in advance,
> Yiannis
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev