Add RAISE_VARARGS 0 (#146493)

Pull Request resolved: https://github.com/pytorch/pytorch/pull/146493
Approved by: https://github.com/zou3519
ghstack dependencies: #146498, #146492

test/dynamo/test_misc.py

@@ -11897,6 +11897,27 @@ fn
         self.assertFalse(ne)
         self.assertEqual(len(counters["graph_break"]), 1)
 
+    @unittest.skipIf(sys.version_info < (3, 11), "Python 3.11+")
+    def test_RAISE_VARARGS_0(self):
+        def foo():
+            try:
+                raise ValueError
+            except:
+                raise
+
+        @torch.compile(backend="eager", fullgraph=True)
+        def fn(t):
+            try:
+                foo()
+            except ValueError:
+                return t.sin()
+            except Exception:
+                return t.cos()
+
+        t = torch.randn(2)
+        y = fn(t)
+        self.assertEqual(y, t.sin())
+
     def test_overridden_getattribute(self):
         class Foo:
             attribute_map = {}

torch/_dynamo/symbolic_convert.py

@@ -1562,7 +1562,12 @@ class InstructionTranslatorBase(
 
     def RAISE_VARARGS(self, inst):
         if inst.arg == 0:
-            unimplemented("re-raise")
+            # duplicate the top of the stack and re-raise it
+            if sys.version_info < (3, 11):
+                unimplemented("re-raise")
+            assert isinstance(self.stack[-1], ExceptionVariable)
+            self.stack.append(self.stack[-1])
+            self._raise_exception_variable(inst)
         elif inst.arg == 1:
             self._raise_exception_variable(inst)
         else: