llvm dev - Dec 2015 - A problem about LLVM IR

Hello,
  When I process a LLBM IR(hello.bc), how can I distinguish the
"define"
function from "declare" function in the  IR likes blow:

define i32 @main() ssp {
entry:
  %retval = alloca i32
  %0 = alloca i32
  %"alloca point" = bitcast i32 0 to i32
  %1 = call i32 @puts(i8* getelementptr inbounds ([13 x i8]* @.str,
i64 0, i64 0))
  store i32 0, i32* %0, align 4
  %2 = load i32* %0, align 4
  store i32 %2, i32* %retval, align 4
  br label %return
return:
  %retval1 = load i32* %retval
  ret i32 %retval1
}

declare i32 @puts(i8*)

when i write a pass as blow, it print both "main" and
"puts", now I only
want to get the "define" function(main) but not "declare"
function(puts),
what can I do to complish my work?

Module::iterator It = _Module->begin(), Ite = _Module->end();
for(; It != Ite; ++It)
{
   errs()<<It->getName()<<"\n";
}


Thx.

--WangLei (BUPT)
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20151215/e215f587/attachment.html>

Hi Lei,

You want It->isDeclaration(). It will return true for "declare" and
false
for "define".

Cheers,

James

On Tue, 15 Dec 2015 at 08:01 Lei Wang via llvm-dev <llvm-dev at
lists.llvm.org>
wrote:
> Hello,
>   When I process a LLBM IR(hello.bc), how can I distinguish the
"define"
> function from "declare" function in the  IR likes blow:
>
> define i32 @main() ssp {
> entry:
>   %retval = alloca i32
>   %0 = alloca i32
>   %"alloca point" = bitcast i32 0 to i32
>   %1 = call i32 @puts(i8* getelementptr inbounds ([13 x i8]* @.str, i64 0,
i64 0))
>   store i32 0, i32* %0, align 4
>   %2 = load i32* %0, align 4
>   store i32 %2, i32* %retval, align 4
>   br label %return
> return:
>   %retval1 = load i32* %retval
>   ret i32 %retval1
> }
>
> declare i32 @puts(i8*)
>
> when i write a pass as blow, it print both "main" and
"puts", now I only
> want to get the "define" function(main) but not
"declare" function(puts),
> what can I do to complish my work?
>
> Module::iterator It = _Module->begin(), Ite = _Module->end();
> for(; It != Ite; ++It)
> {
>    errs()<<It->getName()<<"\n";
> }
>
>
> Thx.
>
> --WangLei (BUPT)
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20151215/f359cd08/attachment.html>