bpo-40826: Add _Py_EnsureTstateNotNULL() macro (GH-20571)

Add _Py_EnsureTstateNotNULL(tstate) macro: call Py_FatalError() if
tstate is NULL, the error message contains the current function name.

1 files changed, 12 insertions, 13 deletions

diff --git a/Python/ceval.c b/Python/ceval.c
index a79773f..01dd361 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -240,16 +240,15 @@ UNSIGNAL_ASYNC_EXC(PyInterpreterState *interp)
 #endif
 #include "ceval_gil.h"
 
-static void
-ensure_tstate_not_null(const char *func, PyThreadState *tstate)
+void _Py_NO_RETURN
+_Py_FatalError_TstateNULL(const char *func)
 {
-    if (tstate == NULL) {
-        _Py_FatalErrorFunc(func,
-                           "current thread state is NULL (released GIL?)");
-    }
+    _Py_FatalErrorFunc(func,
+                       "the function must be called with the GIL held, "
+                       "but the GIL is released "
+                       "(the current Python thread state is NULL)");
 }
 
-
 #ifdef EXPERIMENTAL_ISOLATED_SUBINTERPRETERS
 int
 _PyEval_ThreadsInitialized(PyInterpreterState *interp)
@@ -374,7 +373,7 @@ PyEval_AcquireLock(void)
 {
     _PyRuntimeState *runtime = &_PyRuntime;
     PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
-    ensure_tstate_not_null(__func__, tstate);
+    _Py_EnsureTstateNotNULL(tstate);
 
     take_gil(tstate);
 }
@@ -403,7 +402,7 @@ _PyEval_ReleaseLock(PyThreadState *tstate)
 void
 PyEval_AcquireThread(PyThreadState *tstate)
 {
-    ensure_tstate_not_null(__func__, tstate);
+    _Py_EnsureTstateNotNULL(tstate);
 
     take_gil(tstate);
 
@@ -442,7 +441,7 @@ void
 _PyEval_ReInitThreads(_PyRuntimeState *runtime)
 {
     PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
-    ensure_tstate_not_null(__func__, tstate);
+    _Py_EnsureTstateNotNULL(tstate);
 
 #ifdef EXPERIMENTAL_ISOLATED_SUBINTERPRETERS
     struct _gil_runtime_state *gil = &tstate->interp->ceval.gil;
@@ -486,7 +485,7 @@ PyEval_SaveThread(void)
 #else
     PyThreadState *tstate = _PyThreadState_Swap(&runtime->gilstate, NULL);
 #endif
-    ensure_tstate_not_null(__func__, tstate);
+    _Py_EnsureTstateNotNULL(tstate);
 
     struct _ceval_runtime_state *ceval = &runtime->ceval;
     struct _ceval_state *ceval2 = &tstate->interp->ceval;
@@ -502,7 +501,7 @@ PyEval_SaveThread(void)
 void
 PyEval_RestoreThread(PyThreadState *tstate)
 {
-    ensure_tstate_not_null(__func__, tstate);
+    _Py_EnsureTstateNotNULL(tstate);
 
     take_gil(tstate);
 
@@ -944,7 +943,7 @@ eval_frame_handle_pending(PyThreadState *tstate)
 PyObject* _Py_HOT_FUNCTION
 _PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
 {
-    ensure_tstate_not_null(__func__, tstate);
+    _Py_EnsureTstateNotNULL(tstate);
 
 #ifdef DXPAIRS
     int lastopcode = 0;