我试图从AST生成llvm-ir。
为了显示整数输出,我添加了以下内容:
Constant *CalleeF = TheModule->getOrInsertFunction("printf",FunctionType::get(IntegerType::getInt32Ty(Context), PointerType::get(Type::getInt8Ty(Context), 0), true);`
而在调用打印函数时,我写了以下内容,
Value* PrintStmt::codegen(){
Value* V,*val,*to_print;
vector<Value *> ArgsV;
for (unsigned int i = 0, e = outs.size(); i != e; ++i){
to_print = outs[i]->codegen();
if(outs[i]->type=="int"){
val=Builder.CreateGlobalStringPtr("%d");
}
ArgsV.push_back(val);
ArgsV.push_back(to_print);
V = Builder.CreateCall(CalleeF, ArgsV, "printfCall");
}
return V;
}
我应该写什么类似的代码来获取用户输入,即scanf调用的代码?