[LLVMdev] Advice on MachineMoves and SEH

[Devang Patel]

On Jun 2, 2011, at 6:20 AM, Rafael Ávila de Espíndola wrote:

> On 11-06-02 6:56 AM, Anton Korobeynikov wrote:
>> Hi Chip,
>> 
>>> Because of all this, it's hard to reconstruct the SEH information from
>>> the MachineMove array. I have thought about adding a new array specific
>>> to SEH information, but I'm not sure how you guys would feel about that.
>>> Any ideas on how to solve this problem?
>> Same problem with ARM-specific EH. I ended with own information
>> scheme, where instructions are marked as "frame related" during all
>> prologue&  epilogue emission and later are "recognized" during the MI
>> =>  MCInst lowering. You might want to look into ARM backend, maybe we
>> can somehow "generalize" this approach.
>> 
> 
> Yes, the current model of producing a on the side vector of machine 
> moves doesn't look like the best thing to do now that we produce cfi 
> directives.
> 
> I was thinking about just creating pseudo instructions that map 1:1 to 
> the cfi directives (and ARM, and SEH). Codegen would create the 
> appropriate one depending on the target. This would also avoid the silly 
> labels that we still create when producing cfi.

+1

-
Devang