From 8daa742e8b07800c6a9c3a232c48f07bff245652 Mon Sep 17 00:00:00 2001
From: cyy <cyyever@outlook.com>
Date: Sat, 15 Feb 2025 06:43:25 +0000
Subject: [PATCH] Remove code for Python < 3.9 (#147181)

Fixes #ISSUE_NUMBER

Pull Request resolved: https://github.com/pytorch/pytorch/pull/147181
Approved by: https://github.com/albanD
---
 cmake/Dependencies.cmake         |  4 ++--
 torch/csrc/dynamo/debug_macros.h |  5 -----
 torch/csrc/dynamo/eval_frame.c   | 27 ---------------------------
 3 files changed, 2 insertions(+), 34 deletions(-)

diff --git a/cmake/Dependencies.cmake b/cmake/Dependencies.cmake
index b02b3faa410..ee63ffde8c5 100644
--- a/cmake/Dependencies.cmake
+++ b/cmake/Dependencies.cmake
@@ -864,9 +864,9 @@ if(NOT Python_Interpreter_FOUND)
   message(FATAL_ERROR "Python3 could not be found.")
 endif()
 
-if(${Python_VERSION} VERSION_LESS 3.8)
+if(${Python_VERSION} VERSION_LESS 3.9)
   message(FATAL_ERROR
-    "Found Python libraries version ${Python_VERSION}. Python < 3.8 is no longer supported by PyTorch.")
+    "Found Python libraries version ${Python_VERSION}. Python < 3.9 is no longer supported by PyTorch.")
 endif()
 
 # ---[ Python + Numpy
diff --git a/torch/csrc/dynamo/debug_macros.h b/torch/csrc/dynamo/debug_macros.h
index ba2b201be85..60b295bd313 100644
--- a/torch/csrc/dynamo/debug_macros.h
+++ b/torch/csrc/dynamo/debug_macros.h
@@ -58,14 +58,9 @@ extern "C" {
 inline _PyFrameEvalFunction _debug_set_eval_frame(
     PyThreadState* tstate,
     _PyFrameEvalFunction eval_frame) {
-#if PY_VERSION_HEX >= 0x03090000
   _PyFrameEvalFunction prev =
       _PyInterpreterState_GetEvalFrameFunc(tstate->interp);
   _PyInterpreterState_SetEvalFrameFunc(tstate->interp, eval_frame);
-#else
-  _PyFrameEvalFunction prev = tstate->interp->eval_frame;
-  tstate->interp->eval_frame = eval_frame;
-#endif
   return prev;
 }
 
diff --git a/torch/csrc/dynamo/eval_frame.c b/torch/csrc/dynamo/eval_frame.c
index e3c67a83d11..adbbcb3f7f4 100644
--- a/torch/csrc/dynamo/eval_frame.c
+++ b/torch/csrc/dynamo/eval_frame.c
@@ -205,27 +205,17 @@ static PyObject* (*previous_eval_frame)(
     THP_EVAL_API_FRAME_OBJECT* frame,
     int throw_flag) = NULL;
 
-#if PY_VERSION_HEX >= 0x03090000
 static PyObject* dynamo_custom_eval_frame_shim(
     PyThreadState* tstate,
     THP_EVAL_API_FRAME_OBJECT* frame,
     int throw_flag) {
   return dynamo__custom_eval_frame_shim(tstate, frame, throw_flag);
 }
-#else
-static PyObject* dynamo_custom_eval_frame_shim(
-    THP_EVAL_API_FRAME_OBJECT* frame,
-    int throw_flag) {
-  PyThreadState* tstate = PyThreadState_GET();
-  return dynamo__custom_eval_frame_shim(tstate, frame, throw_flag);
-}
-#endif
 
 static PyObject* dynamo_eval_frame_default(
     PyThreadState* tstate,
     THP_EVAL_API_FRAME_OBJECT* frame,
     int throw_flag) {
-#if PY_VERSION_HEX >= 0x03090000
   if (tstate == NULL) {
     tstate = PyThreadState_GET();
   }
@@ -234,13 +224,9 @@ static PyObject* dynamo_eval_frame_default(
   } else {
     return _PyEval_EvalFrameDefault(tstate, frame, throw_flag);
   }
-#else
-  return _PyEval_EvalFrameDefault(frame, throw_flag);
-#endif
 }
 
 static void enable_eval_frame_shim(PyThreadState* tstate) {
-#if PY_VERSION_HEX >= 0x03090000
   if (_PyInterpreterState_GetEvalFrameFunc(tstate->interp) !=
       &dynamo_custom_eval_frame_shim) {
     DEBUG_CHECK(previous_eval_frame == NULL);
@@ -248,28 +234,15 @@ static void enable_eval_frame_shim(PyThreadState* tstate) {
     _PyInterpreterState_SetEvalFrameFunc(
         tstate->interp, &dynamo_custom_eval_frame_shim);
   }
-#else
-  if (tstate->interp->eval_frame != &custom_eval_frame_shim) {
-    // First call
-    tstate->interp->eval_frame = &custom_eval_frame_shim;
-  }
-#endif
 }
 
 static void enable_eval_frame_default(PyThreadState* tstate) {
-#if PY_VERSION_HEX >= 0x03090000
   if (_PyInterpreterState_GetEvalFrameFunc(tstate->interp) !=
       previous_eval_frame) {
     DEBUG_CHECK(previous_eval_frame != NULL);
     _PyInterpreterState_SetEvalFrameFunc(tstate->interp, previous_eval_frame);
     previous_eval_frame = NULL;
   }
-#else
-  if (tstate->interp->eval_frame != &_PyEval_EvalFrameDefault) {
-    // First call
-    tstate->interp->eval_frame = &_PyEval_EvalFrameDefault;
-  }
-#endif
 }
 
 static const char* get_frame_name(THP_EVAL_API_FRAME_OBJECT* frame) {