From 81c72044a181dbbfbf689d7a977d0d99090f26a8 Mon Sep 17 00:00:00 2001 From: Eric Snow Date: Tue, 8 Feb 2022 13:39:07 -0700 Subject: bpo-46541: Replace core use of _Py_IDENTIFIER() with statically initialized global objects. (gh-30928) We're no longer using _Py_IDENTIFIER() (or _Py_static_string()) in any core CPython code. It is still used in a number of non-builtin stdlib modules. The replacement is: PyUnicodeObject (not pointer) fields under _PyRuntimeState, statically initialized as part of _PyRuntime. A new _Py_GET_GLOBAL_IDENTIFIER() macro facilitates lookup of the fields (along with _Py_GET_GLOBAL_STRING() for non-identifier strings). https://bugs.python.org/issue46541#msg411799 explains the rationale for this change. The core of the change is in: * (new) Include/internal/pycore_global_strings.h - the declarations for the global strings, along with the macros * Include/internal/pycore_runtime_init.h - added the static initializers for the global strings * Include/internal/pycore_global_objects.h - where the struct in pycore_global_strings.h is hooked into _PyRuntimeState * Tools/scripts/generate_global_objects.py - added generation of the global string declarations and static initializers I've also added a --check flag to generate_global_objects.py (along with make check-global-objects) to check for unused global strings. That check is added to the PR CI config. The remainder of this change updates the core code to use _Py_GET_GLOBAL_IDENTIFIER() instead of _Py_IDENTIFIER() and the related _Py*Id functions (likewise for _Py_GET_GLOBAL_STRING() instead of _Py_static_string()). This includes adding a few functions where there wasn't already an alternative to _Py*Id(), replacing the _Py_Identifier * parameter with PyObject *. The following are not changed (yet): * stop using _Py_IDENTIFIER() in the stdlib modules * (maybe) get rid of _Py_IDENTIFIER(), etc. entirely -- this may not be doable as at least one package on PyPI using this (private) API * (maybe) intern the strings during runtime init https://bugs.python.org/issue46541 --- Include/internal/pycore_object.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Include/internal/pycore_object.h') diff --git a/Include/internal/pycore_object.h b/Include/internal/pycore_object.h index e2da2537c11..65abc1884c3 100644 --- a/Include/internal/pycore_object.h +++ b/Include/internal/pycore_object.h @@ -8,9 +8,11 @@ extern "C" { # error "this header requires Py_BUILD_CORE define" #endif +#include #include "pycore_gc.h" // _PyObject_GC_IS_TRACKED() #include "pycore_interp.h" // PyInterpreterState.gc #include "pycore_pystate.h" // _PyInterpreterState_GET() +#include "pycore_runtime.h" // _PyRuntime #define _PyObject_IMMORTAL_INIT(type) \ @@ -236,6 +238,8 @@ extern PyObject* _PyType_GetSubclasses(PyTypeObject *); #define _PyHeapType_GET_MEMBERS(etype) \ ((PyMemberDef *)(((char *)etype) + Py_TYPE(etype)->tp_basicsize)) +PyAPI_FUNC(PyObject *) _PyObject_LookupSpecial(PyObject *, PyObject *); + #ifdef __cplusplus } #endif -- cgit v1.2.3