[llvm-dev] A problem about LLVM IR

[James Molloy via llvm-dev]

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)
>
>
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