[dynamo][guards] Read the attr name from GetAttrGuardAccessor (pytorch#159754)

Pull Request resolved: pytorch#159754
Approved by: https://github.com/jansel
ghstack dependencies: pytorch#159752

Author: anijain2305

test/dynamo/test_guard_manager.py

@@ -1008,6 +1008,12 @@ def hook(guard_wrapper, f_locals, builder):
             from torch._dynamo.source import AttrSource, LocalSource
 
             foo_source = LocalSource("foo")
+            foo_mgr = builder.get_guard_manager_from_source(foo_source)
+            for accessor in foo_mgr.get_accessors():
+                if isinstance(accessor, GetAttrGuardAccessor):
+                    self.assertTrue(
+                        accessor.get_attr_name() in ("a", "b", "c", "d", "e")
+                    )
 
             # Check types of foo.a
             foo_a_source = AttrSource(foo_source, "a")

torch/_C/_dynamo/guards.pyi

@@ -142,6 +142,9 @@ class GetGenericDictGuardAccessor(GuardAccessor): ...
 class TypeDictGuardAccessor(GuardAccessor): ...
 class TypeMROGuardAccessor(GuardAccessor): ...
 
+class GetAttrGuardAccessor(GuardAccessor):
+    def get_attr_name(self) -> str: ...
+
 def install_object_aliasing_guard(
     guard_managers: list[GuardManager],
     tensor_names: list[str],

torch/csrc/dynamo/guards.cpp

@@ -4244,6 +4244,10 @@ class GetAttrGuardAccessor : public GuardAccessor {
         ")";
   }
 
+  std::string get_attr_name() {
+    return py::str(_attr_name).cast<std::string>();
+  }
+
  public: // cloning functions
   GetAttrGuardAccessor(GuardManager* guard_manager, GetAttrGuardAccessor* from)
       : GuardAccessor(guard_manager, from) {
@@ -6584,11 +6588,11 @@ PyObject* torch_c_dynamo_guards_init() {
   py::class_<GuardAccessor, std::unique_ptr<GuardAccessor>>(
       py_m, "GuardAccessor")
       .def("repr", &GuardAccessor::repr);
-  // NOLINTNEXTLINE(bugprone-unused-raii)
   py::class_<
       GetAttrGuardAccessor,
       GuardAccessor,
-      std::unique_ptr<GetAttrGuardAccessor>>(py_m, "GetAttrGuardAccessor");
+      std::unique_ptr<GetAttrGuardAccessor>>(py_m, "GetAttrGuardAccessor")
+      .def("get_attr_name", &GetAttrGuardAccessor::get_attr_name);
   // NOLINTNEXTLINE(bugprone-unused-raii)
   py::class_<
       GenericGetAttrGuardAccessor,