[LLVMdev] Purpose of PROLOG_LABEL in function prologue?

Cameron Esfahani
2010-08-03T22:19:14Z

I don't see any references to them, that's why I brought it up...

On Aug 3, 2010, at 3:12 PM, Eric Christopher wrote:

>
> On Aug 3, 2010, at 3:04 PM, Cameron Esfahani wrote:
>
>> I've been building/dumping some x86_64 code and I've noticed
that each of the routines has 3 temporary symbols, à la:
>>
>> _main:
>> 	pushq	%rbp
>> Ltmp18:
>> 	movq	%rsp, %rbp
>> Ltmp19:
>> 	subq	$320, %rsp
>> Ltmp20:
>> 	movl	%ecx, -276(%rbp)
>>
>> I've tracked them back to emitPrologue in X86RegisterInfo.cpp.
I'm wonder what's their purpose?
>>
>> They're filling up my symbol table...
>
>
> EH ranges for unwind info.  If you look later on in the file for the
symbols you'll see them.
>
> -eric

Cameron Esfahani
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