小编use*_*840的帖子

我试图找到存储指令的指针操作数和函数参数之间的别名.这是代码,

virtual void getAnalysisUsage(AnalysisUsage &AU) const {

    AU.addRequiredTransitive<AliasAnalysis>();
    AU.addPreserved<AliasAnalysis>();
}

virtual bool runOnFunction(Function &F) {

    AliasAnalysis &AA = getAnalysis<AliasAnalysis>();

    for(Function::iterator i=F.begin();i!=F.end();++i){
        for(BasicBlock::iterator j=i->begin();j!=i->end();++j)
        {
            if(dyn_cast<StoreInst>(j)){
                const StoreInst *SI=dyn_cast<StoreInst>(j);

                AliasAnalysis::Location LocA = AA.getLocation(SI);

                const Value *si_v= SI->getPointerOperand();

                for(Function::arg_iterator k=F.arg_begin(); k!=F.arg_end();++k)
                {
                    Value *v=dyn_cast<Value>(k);

                    AliasAnalysis::Location loc=AliasAnalysis::Location(v);
                    AliasAnalysis::AliasResult ar=AA.alias(LocA,loc);

                    switch(ar)
                    {
                    case 0:errs()<<  "NoAlias\n";
                    break;
                    ///< No dependencies.
                    case 1:errs()<<"MayAlias\n";    ///< Anything goes
                    break;
                    case 2: errs()<<"PartialAlias\n";///< Pointers differ, but pointees overlap.
                    break;

                    case 3: errs()<<"MustAlias\n";
                    }
               }
   }

   return true;
}
}; …