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Introduce get_python_state_dict()
for Python 3.12 compatibility. (#4570)
* Introduce `get_python_state_dict()` * Conditional version bump for Python 3.12+ * Shuffle subexpressions to make the condition easier to understand (no change to logic). * Make pybind11 ABI version 5 the minimum for Python 3.12+ (as suggested by @Lalaland) * Add back condition for PYPY_VERSION, but keep it open for future PyPy versions. * Fall back to simple `|| defined(PYPY_VERSION)`. `PY_VERSION_HEX` does not appear to be meaningful with PyPy.
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@ -34,9 +34,18 @@
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/// further ABI-incompatible changes may be made before the ABI is officially
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/// changed to the new version.
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#ifndef PYBIND11_INTERNALS_VERSION
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# if PY_VERSION_HEX >= 0x030C0000
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// Version bump for Python 3.12+, before first 3.12 beta release.
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# define PYBIND11_INTERNALS_VERSION 5
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# else
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# define PYBIND11_INTERNALS_VERSION 4
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# endif
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#endif
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// This requirement is mainly to reduce the support burden (see PR #4570).
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static_assert(PY_VERSION_HEX < 0x030C0000 || PYBIND11_INTERNALS_VERSION >= 5,
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"pybind11 ABI version 5 is the minimum for Python 3.12+");
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PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
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using ExceptionTranslator = void (*)(std::exception_ptr);
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@ -421,6 +430,38 @@ inline void translate_local_exception(std::exception_ptr p) {
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}
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#endif
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inline object get_python_state_dict() {
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object state_dict;
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#if PYBIND11_INTERNALS_VERSION <= 4 || PY_VERSION_HEX < 0x03080000 || defined(PYPY_VERSION)
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state_dict = reinterpret_borrow<object>(PyEval_GetBuiltins());
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#else
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# if PY_VERSION_HEX < 0x03090000
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PyInterpreterState *istate = _PyInterpreterState_Get();
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# else
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PyInterpreterState *istate = PyInterpreterState_Get();
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# endif
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if (istate) {
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state_dict = reinterpret_borrow<object>(PyInterpreterState_GetDict(istate));
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}
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#endif
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if (!state_dict) {
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raise_from(PyExc_SystemError, "pybind11::detail::get_python_state_dict() FAILED");
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}
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return state_dict;
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}
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inline object get_internals_obj_from_state_dict(handle state_dict) {
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return reinterpret_borrow<object>(dict_getitemstring(state_dict.ptr(), PYBIND11_INTERNALS_ID));
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}
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inline internals **get_internals_pp_from_capsule(handle obj) {
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void *raw_ptr = PyCapsule_GetPointer(obj.ptr(), /*name=*/nullptr);
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if (raw_ptr == nullptr) {
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raise_from(PyExc_SystemError, "pybind11::detail::get_internals_pp_from_capsule() FAILED");
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}
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return static_cast<internals **>(raw_ptr);
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}
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/// Return a reference to the current `internals` data
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PYBIND11_NOINLINE internals &get_internals() {
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auto **&internals_pp = get_internals_pp();
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@ -445,12 +486,12 @@ PYBIND11_NOINLINE internals &get_internals() {
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#endif
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error_scope err_scope;
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PYBIND11_STR_TYPE id(PYBIND11_INTERNALS_ID);
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auto builtins = handle(PyEval_GetBuiltins());
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if (builtins.contains(id) && isinstance<capsule>(builtins[id])) {
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internals_pp = static_cast<internals **>(capsule(builtins[id]));
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// We loaded builtins through python's builtins, which means that our `error_already_set`
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dict state_dict = get_python_state_dict();
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if (object internals_obj = get_internals_obj_from_state_dict(state_dict)) {
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internals_pp = get_internals_pp_from_capsule(internals_obj);
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}
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if (internals_pp && *internals_pp) {
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// We loaded the internals through `state_dict`, which means that our `error_already_set`
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// and `builtin_exception` may be different local classes than the ones set up in the
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// initial exception translator, below, so add another for our local exception classes.
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//
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@ -484,7 +525,7 @@ PYBIND11_NOINLINE internals &get_internals() {
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# endif
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internals_ptr->istate = tstate->interp;
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#endif
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builtins[id] = capsule(internals_pp);
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state_dict[PYBIND11_INTERNALS_ID] = capsule(internals_pp);
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internals_ptr->registered_exception_translators.push_front(&translate_exception);
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internals_ptr->static_property_type = make_static_property_type();
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internals_ptr->default_metaclass = make_default_metaclass();
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@ -243,16 +243,14 @@ inline void initialize_interpreter(bool init_signal_handlers = true,
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\endrst */
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inline void finalize_interpreter() {
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handle builtins(PyEval_GetBuiltins());
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const char *id = PYBIND11_INTERNALS_ID;
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// Get the internals pointer (without creating it if it doesn't exist). It's possible for the
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// internals to be created during Py_Finalize() (e.g. if a py::capsule calls `get_internals()`
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// during destruction), so we get the pointer-pointer here and check it after Py_Finalize().
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detail::internals **internals_ptr_ptr = detail::get_internals_pp();
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// It could also be stashed in builtins, so look there too:
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if (builtins.contains(id) && isinstance<capsule>(builtins[id])) {
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internals_ptr_ptr = capsule(builtins[id]);
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// It could also be stashed in state_dict, so look there too:
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if (object internals_obj
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= get_internals_obj_from_state_dict(detail::get_python_state_dict())) {
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internals_ptr_ptr = detail::get_internals_pp_from_capsule(internals_obj);
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}
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// Local internals contains data managed by the current interpreter, so we must clear them to
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// avoid undefined behaviors when initializing another interpreter
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@ -255,10 +255,10 @@ TEST_CASE("Add program dir to path using PyConfig") {
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}
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#endif
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bool has_pybind11_internals_builtin() {
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auto builtins = py::handle(PyEval_GetBuiltins());
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return builtins.contains(PYBIND11_INTERNALS_ID);
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};
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bool has_state_dict_internals_obj() {
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return bool(
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py::detail::get_internals_obj_from_state_dict(py::detail::get_python_state_dict()));
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}
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bool has_pybind11_internals_static() {
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auto **&ipp = py::detail::get_internals_pp();
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@ -268,7 +268,7 @@ bool has_pybind11_internals_static() {
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TEST_CASE("Restart the interpreter") {
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// Verify pre-restart state.
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REQUIRE(py::module_::import("widget_module").attr("add")(1, 2).cast<int>() == 3);
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REQUIRE(has_pybind11_internals_builtin());
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REQUIRE(has_state_dict_internals_obj());
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REQUIRE(has_pybind11_internals_static());
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REQUIRE(py::module_::import("external_module").attr("A")(123).attr("value").cast<int>()
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== 123);
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@ -285,10 +285,10 @@ TEST_CASE("Restart the interpreter") {
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REQUIRE(Py_IsInitialized() == 1);
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// Internals are deleted after a restart.
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_state_dict_internals_obj());
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REQUIRE_FALSE(has_pybind11_internals_static());
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pybind11::detail::get_internals();
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REQUIRE(has_pybind11_internals_builtin());
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REQUIRE(has_state_dict_internals_obj());
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REQUIRE(has_pybind11_internals_static());
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REQUIRE(reinterpret_cast<uintptr_t>(*py::detail::get_internals_pp())
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== py::module_::import("external_module").attr("internals_at")().cast<uintptr_t>());
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@ -303,13 +303,13 @@ TEST_CASE("Restart the interpreter") {
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py::detail::get_internals();
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*static_cast<bool *>(ran) = true;
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});
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_state_dict_internals_obj());
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REQUIRE_FALSE(has_pybind11_internals_static());
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REQUIRE_FALSE(ran);
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py::finalize_interpreter();
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REQUIRE(ran);
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py::initialize_interpreter();
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_state_dict_internals_obj());
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REQUIRE_FALSE(has_pybind11_internals_static());
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// C++ modules can be reloaded.
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@ -331,7 +331,7 @@ TEST_CASE("Subinterpreter") {
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REQUIRE(m.attr("add")(1, 2).cast<int>() == 3);
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}
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REQUIRE(has_pybind11_internals_builtin());
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REQUIRE(has_state_dict_internals_obj());
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REQUIRE(has_pybind11_internals_static());
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/// Create and switch to a subinterpreter.
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@ -341,7 +341,7 @@ TEST_CASE("Subinterpreter") {
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// Subinterpreters get their own copy of builtins. detail::get_internals() still
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// works by returning from the static variable, i.e. all interpreters share a single
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// global pybind11::internals;
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_state_dict_internals_obj());
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REQUIRE(has_pybind11_internals_static());
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// Modules tags should be gone.
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