[LLVMdev] Exception Tables in latest LLVM (original) (raw)

Duncan Sands baldrick at free.fr
Fri Sep 2 07:58:56 PDT 2011

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 .gccexcepttable,"a", at progbits .align 4 GCCexcepttable0: .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 = .Lehfuncbegin0-.Lehfuncbegin0 # Region start .long .Lset0 .Lset1 = .Ltmp0-.Lehfuncbegin0 # Region length .long .Lset1 .long 0 # Landing pad .uleb128 0 # Action .Lset2 = .Ltmp0-.Lehfuncbegin0 # Region start .long .Lset2 .Lset3 = .Ltmp1-.Ltmp0 # Region length .long .Lset3 .Lset4 = .Ltmp2-.Lehfuncbegin0 # Landing pad .long .Lset4 .uleb128 0 # Action .Lset5 = .Ltmp1-.Lehfuncbegin0 # Region start .long .Lset5 .Lset6 = .Lehfuncend0-.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

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