[LLVMdev] Inserting Instructions (pass)

Michael Graumann MichaelGraumann at gmx.net
Fri Jul 31 10:24:08 PDT 2009


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,




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 ???,

                  //CallInst* ae = new CallInst(au ??); 

//Works fine

                  AllocaInst* ai = new AllocaInst(Type::Int16Ty);

                  Instruction *pi = bi;

                  pi->getParent()->getInstList().insert(pi, ai);





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




  /// FunctionType::get - This static method is the primary way of

  /// 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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