[lldb] Adapt code to Python 3.13

[tuliom]

1. Remove usage of PyEval_ThreadsInitialized and PyEval_InitThreads

Both of these functions were removed in Python 3.13 [1] after being deprecated since Python 3.9.

According to "What's new in Python 3.13" document [1]:

Since Python 3.7, Py_Initialize() always creates the GIL: calling
PyEval_InitThreads() did nothing and PyEval_ThreadsInitialized()
always returned non-zero.

2. Replace _Py_IsFinalizing() with Py_IsFinalizing().

[1] https://docs.python.org/3.13/whatsnew/3.13.html

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Tulio Magno Quites Machado Filho (tuliom)

Changes

1. Remove usage of PyEval_ThreadsInitialized and PyEval_InitThreads

Both of these functions were removed in Python 3.13 [1] after being deprecated since Python 3.9.

According to "What's new in Python 3.13" document [1]:

Since Python 3.7, Py_Initialize() always creates the GIL: calling
PyEval_InitThreads() did nothing and PyEval_ThreadsInitialized()
always returned non-zero.

2. Replace _Py_IsFinalizing() with Py_IsFinalizing().

[1] https://docs.python.org/3.13/whatsnew/3.13.html

---

Full diff: https://github.com/llvm/llvm-project/pull/70445.diff

2 Files Affected:

• (modified) lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp (+3-1)
• (modified) lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp (+9)

diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
index 9ac840a4a102da3..fe3438c42471543 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
@@ -71,7 +71,9 @@ Expected<std::string> python::As<std::string>(Expected<PythonObject> &&obj) {
 }
 
 static bool python_is_finalizing() {
-#if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 7
+#if (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 13) || (PY_MAJOR_VERSION > 3)
+  return Py_IsFinalizing();
+#elif PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 7
   return _Py_Finalizing != nullptr;
 #else
   return _Py_IsFinalizing();
diff --git a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
index a57c8e4984ad8a8..968cc8ca03001e5 100644
--- a/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
+++ b/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
@@ -179,18 +179,27 @@ struct InitializePythonRAII {
       return;
 #endif
 
+// `PyEval_ThreadsInitialized` was deprecated in Python 3.9 and removed in
+// Python 3.13. It has been returning `true` always since Python 3.7.
+#if (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 9) || (PY_MAJOR_VERSION < 3)
     if (PyEval_ThreadsInitialized()) {
+#endif
       Log *log = GetLog(LLDBLog::Script);
 
       m_was_already_initialized = true;
       m_gil_state = PyGILState_Ensure();
       LLDB_LOGV(log, "Ensured PyGILState. Previous state = {0}locked\n",
                 m_gil_state == PyGILState_UNLOCKED ? "un" : "");
+
+// `PyEval_InitThreads` was deprecated in Python 3.9 and removed in
+// Python 3.13.
+#if (PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION < 9) || (PY_MAJOR_VERSION < 3)
       return;
     }
 
     // InitThreads acquires the GIL if it hasn't been called before.
     PyEval_InitThreads();
+#endif
   }
 
   PyGILState_STATE m_gil_state = PyGILState_UNLOCKED;

[medismailben]

LGTM!