Lab6: fix performance test freeze by only zero-initializing local variables with initializers

scripts/run_all_tests.sh

@@ -2,8 +2,8 @@
 
 # 批量测试所有.sy文件的语法解析
 
-test_dir="/home/lingli/nudt-compiler-cpp/test/test_case"
-compiler="/home/lingli/nudt-compiler-cpp/build/bin/compiler"
+test_dir="$(pwd)/test/test_case"
+compiler="$(pwd)/build/bin/compiler"
 
 if [ ! -f "$compiler" ]; then
     echo "错误：编译器不存在，请先构建项目"

src/irgen/IRGenDecl.cpp

@@ -208,8 +208,10 @@ std::any IRGenImpl::visitVarDef(SysYParser::VarDefContext* ctx) {
     slot = module_.CreateGlobalValue(name, StorageType(ty), init);
   } else {
     slot = builder_.CreateAlloca(StorageType(ty), name);
-    ZeroInitializeLocal(slot, ty);
-    if (ctx->initValue()) EmitLocalInitValue(slot, ty, ctx->initValue());
+    if (ctx->initValue()) {
+      ZeroInitializeLocal(slot, ty);
+      EmitLocalInitValue(slot, ty, ctx->initValue());
+    }
   }
 
   storage_map_[ctx] = slot;