fix: lab8 no angr

Author: YingMuo

.github/workflows/lab-autograding.yml

@@ -56,4 +56,7 @@ jobs:
                   if [ ${{ steps.lab.outputs.result }} -eq 6 ]; then
                     sudo apt install -y llvm-14
                   fi
+                  if [ ${{ steps.lab.outputs.result }} -eq 8 ]; then
+                    python3 -m pip install angr
+                  fi
                   ./validate.sh

lab6/llvm-pass.so.cc

@@ -11,27 +11,12 @@ struct LLVMPass : public PassInfoMixin<LLVMPass> {
 PreservedAnalyses LLVMPass::run(Module &M, ModuleAnalysisManager &MAM) {
   LLVMContext &Ctx = M.getContext();
   IntegerType *Int32Ty = IntegerType::getInt32Ty(Ctx);
-  // Prepare debug function and argument
   FunctionCallee debug_func = M.getOrInsertFunction("debug", Int32Ty);
   ConstantInt *debug_arg = ConstantInt::get(Int32Ty, 48763);
 
   for (auto &F : M) {
-    if (F.getName() == "main") {
-      // 1. Invoke debug function with the first argument is 48763 in main function.
-      IRBuilder<> Builder(&*F.getEntryBlock().getFirstInsertionPt());
-      Builder.CreateCall(debug_func, {debug_arg});
-      
-      // 2. Modify argv[1] to a custom string
-      Argument *argv_arg = F.getArg(1);
-      Value *index = ConstantInt::get(Int32Ty, 1);
-      Value *argv_ptr = Builder.CreateInBoundsGEP(Builder.getInt8PtrTy(), argv_arg, index);
-      Value *custom_str = Builder.CreateGlobalStringPtr("hayaku... motohayaku!");
-      Builder.CreateStore(custom_str, argv_ptr);
-      
-      // 3.  Replace all uses of argc with the debug ID = 48763
-      Argument *argc_arg = F.getArg(0);
-      argc_arg->replaceAllUsesWith(debug_arg);
-    }
+    errs() << "func: " << F.getName() << "\n";
+
   }
   return PreservedAnalyses::none();
 }