bpo-36710: Add tstate parameter in import.c (GH-14218)

* Add 'tstate' parameter to many internal import.c functions.
* _PyImportZip_Init() now gets 'tstate' parameter rather than
  'interp'.
* Add 'interp' parameter to _PyState_ClearModules() and rename it
  to _PyInterpreterState_ClearModules().
* Move private _PyImport_FindBuiltin() to the internal C API; add
  'tstate' parameter to it.
* Remove private _PyImport_AddModuleObject() from the C API:
  use public PyImport_AddModuleObject() instead.
* Remove private _PyImport_FindExtensionObjectEx() from the C API:
  use private _PyImport_FindExtensionObject() instead.

Author: vstinner

Include/cpython/import.h

@@ -11,21 +11,14 @@ PyMODINIT_FUNC PyInit__imp(void);
 PyAPI_FUNC(int) _PyImport_IsInitialized(PyInterpreterState *);
 
 PyAPI_FUNC(PyObject *) _PyImport_GetModuleId(struct _Py_Identifier *name);
-PyAPI_FUNC(PyObject *) _PyImport_AddModuleObject(PyObject *name,
-                                                 PyObject *modules);
 PyAPI_FUNC(int) _PyImport_SetModule(PyObject *name, PyObject *module);
 PyAPI_FUNC(int) _PyImport_SetModuleString(const char *name, PyObject* module);
 
 PyAPI_FUNC(void) _PyImport_AcquireLock(void);
 PyAPI_FUNC(int) _PyImport_ReleaseLock(void);
 
-PyAPI_FUNC(PyObject *) _PyImport_FindBuiltin(
-    const char *name,            /* UTF-8 encoded string */
-    PyObject *modules
-    );
 PyAPI_FUNC(PyObject *) _PyImport_FindExtensionObject(PyObject *, PyObject *);
-PyAPI_FUNC(PyObject *) _PyImport_FindExtensionObjectEx(PyObject *, PyObject *,
-                                                       PyObject *);
+
 PyAPI_FUNC(int) _PyImport_FixupBuiltin(
     PyObject *mod,
     const char *name,            /* UTF-8 encoded string */

Include/cpython/pystate.h

@@ -148,7 +148,6 @@ struct _ts {
 PyAPI_FUNC(PyInterpreterState *) _PyInterpreterState_Get(void);
 
 PyAPI_FUNC(int) _PyState_AddModule(PyObject*, struct PyModuleDef*);
-PyAPI_FUNC(void) _PyState_ClearModules(void);
 PyAPI_FUNC(PyThreadState *) _PyThreadState_Prealloc(PyInterpreterState *);
 
 /* Similar to PyThreadState_Get(), but don't issue a fatal error

Include/internal/pycore_import.h

@@ -5,6 +5,11 @@
 extern "C" {
 #endif
 
+PyAPI_FUNC(PyObject *) _PyImport_FindBuiltin(
+    PyThreadState *tstate,
+    const char *name             /* UTF-8 encoded string */
+    );
+
 extern void _PyImport_ReInitLock(void);
 
 #ifdef __cplusplus

Include/internal/pycore_pylifecycle.h

@@ -55,7 +55,7 @@ extern int _PyFloat_Init(void);
 extern PyStatus _Py_HashRandomization_Init(const PyConfig *);
 
 extern PyStatus _PyTypes_Init(void);
-extern PyStatus _PyImportZip_Init(PyInterpreterState *interp);
+extern PyStatus _PyImportZip_Init(PyThreadState *tstate);
 
 
 /* Various internal finalizers */

Include/internal/pycore_pystate.h

@@ -310,6 +310,9 @@ PyAPI_FUNC(PyThreadState *) _PyThreadState_Swap(
 PyAPI_FUNC(PyStatus) _PyInterpreterState_Enable(_PyRuntimeState *runtime);
 PyAPI_FUNC(void) _PyInterpreterState_DeleteExceptMain(_PyRuntimeState *runtime);
 
+/* Used by PyImport_Cleanup() */
+extern void _PyInterpreterState_ClearModules(PyInterpreterState *interp);
+
 PyAPI_FUNC(void) _PyGILState_Reinit(_PyRuntimeState *runtime);
 
 #ifdef __cplusplus