[LLVMdev] Inserting Instructions (pass)

[Chris Lattner]

On Jul 31, 2009, at 10:24 AM, Michael Graumann wrote:

> Hi,
> I’ am trying to insert an InlineAsm Instruction in my pass, which  
> FunctionType do I need for Inlineasm?
> If I understand it right, I need a call instruction to insert the  
> new produced InlineAsm?
>
> Thanks for help

Inline asm works like a "callee".  So for:

call void asm sideeffect "isync", "~{dirflag},~{fpsr},~{flags}"()  
nounwind

The thing your calling has type "void()*".  You just pass "void()"  
into the InlineAsm ctor.

-Chris

> ,
>
> Michael
>
> for (BasicBlock::iterator bi = i->begin(), be = i->end(); bi != be; + 
> +bi){
> std::vector<const Type*> asm_arguments;
>                   FunctionType *asm_type =  
> FunctionType::get(Type::VoidTy, asm_arguments, false);
>                   InlineAsm* au = new InlineAsm(asm_type ???,  
> "isync","~{dirflag},~{fpsr},~{flags}",true);
>                   //CallInst* ae = new CallInst(au ??);
> //Works fine
>                   AllocaInst* ai = new AllocaInst(Type::Int16Ty);
>                   Instruction *pi = bi;
>                   pi->getParent()->getInstList().insert(pi, ai);
>             }
>
>
> Test.ll
> call void asm sideeffect "isync", "~{dirflag},~{fpsr},~{flags}"()  
> nounwind
>
> llvm::FunctionType
> public:
>   /// FunctionType::get - This static method is the primary way of  
> constructing
>   /// a FunctionType.
>   ///
>   static FunctionType *get(
>     const Type *Result, ///< The result type, isync is Void
>     const std::vector<const Type*> &Params, ///< The types of the  
> parameters ???
>     bool isVarArg  ///< Whether this is a variable argument length  
> function, isync false?
>   );
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