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Cycle checking issue in check_inheritance function in PA4

您好，感谢您的代码分享！在check_inheritance函数中似乎有一个问题，判断是否成环不能仅判断一个节点是否最终会返回到自己。比如，D : A, A : B, B : C, C : A的情况，如果从D开始判断的话会死循环。

cool-compiler/assignments/PA4/semant.cc

Lines 315 to 337 in d83175f

 static void check_inheritance() { 

 for (ClassTable::iterator it = classTable.begin(); it != classTable.end(); it++) 

 if (it->first != Object && classTable.find(it->second->getParentName()) == classTable.end()) { 

 curr_class = it->second; 

 semant_error(curr_class) << "Class " << it->second->getName() << " inherits from an undefined class " << it->second->getParentName() << ".\n"; 

 } 

 for (ClassTable::iterator it = classTable.begin(); it != classTable.end(); it++) { 

 if (it->first == Object) continue; 

 curr_class = it->second; 

 Symbol cname = it->first; 

 Symbol pname = it->second->getParentName(); 

 while (pname != Object) { 

 if (pname == cname) { 

 semant_error(curr_class) << "Class " << curr_class->getName() << ", or an ancestor of " << curr_class->getName() << ", is involved in an inheritance cycle.\n"; 

 break; 

 } 

 if (classTable.find(pname) == classTable.end()) 

 break; 

 pname = classTable[pname]->getParentName(); 

 } 

 } 

 }

关于i686

你好，请问你是怎么在ubuntu上面运行i686的代码的呀，我这边一直报错

In arm 64Ubuntu i am not able to run

I have made a VM in mac m1 but it is running arm64 ubuntu and on running any ./coolc 1.cl it is showing
./coolc: 33: exec: ./../bin/.i686/coolc: Exec format error

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