* type_caster_generic: fix compiler error when casting a T that is implicitly convertible from T*
* style: pre-commit fixes
* Placate clang-tidy
* Expand NOLINT to specify Clang-Tidy check names
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* Fix dangling pointer in internals::registered_types_cpp_fast from #5842
@oremanj pointed out in a comment on #5842 that I missed part
of the nanobind PR I was porting in such a way that we could have
dangling pointers in internals::registered_types_cpp_fast. This PR
adds a test that reproed the bug and then fixes the test.
* review feedback, attempt to fix -Werror in CI
* use const ref, skip test on python 3.13 free-threaded
* Skip test on 3.13t more robustly
* style: pre-commit fixes
* CI fix
---------
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* Add fast_type_map, use it authoritatively for local types and as a hint for global types
nanobind has a similar two-level lookup strategy, added and explained
by
b515b1f7f2
In this PR I've ported this approach to pybind11. To avoid an ABI
break, I've kept the fast maps to the `local_internals`. I think this
should be safe because any particular module should see its
`local_internals` reset at least as often as the global `internals`,
and misses in the fast "hint" map for global types fall back to the
global `internals`.
Performance seems to have improved. Using my patched fork of
pybind11_benchmark
(https://github.com/swolchok/pybind11_benchmark/tree/benchmark-updates,
specifically commit hash b6613d12607104d547b1c10a8145d1b3e9937266), I
run bench.py and observe the MyInt case. Each time, I do 3 runs and
just report all 3.
master, Mac: 75.9, 76.9, 75.3 nsec/loop
this PR, Mac: 73.8, 73.8, 73.6 nsec/loop
master, Linux box: 188, 187, 188 nsec/loop
this PR, Linux box: 164, 165, 164 nsec/loop
Note that the "real" percentage improvement is larger than implied by the
above because master does not yet include #5824.
* simplify unsafe_reset_local_internals in test
* pre-implement PYBIND11_INTERNALS_VERSION 12
* use PYBIND11_INTERNALS_VERSION 12 on Python 3.14 per suggestion
* Implement reviewer comments: revert PY_VERSION_HEX change, fix REVIEW comment, add two-level lookup comments. ci.yml coming separately
* Use the inplace build to smoke test ABI bump?
* [skip ci] Remove "smoke" from comment. This is full testing, just only on a few platforms.
---------
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* ChatGPT-generated diamond virtual-inheritance test case.
* Report "virtual base at offset 0" but don't skip test.
* Remove Left/Right virtual default dtors, to resolve clang-tidy errors:
```
/__w/pybind11/pybind11/tests/test_class_sh_mi_thunks.cpp:44:13: error: prefer using 'override' or (rarely) 'final' instead of 'virtual' [modernize-use-override,-warnings-as-errors]
44 | virtual ~Left() = default;
| ~~~~~~~ ^
| override
/__w/pybind11/pybind11/tests/test_class_sh_mi_thunks.cpp:48:13: error: prefer using 'override' or (rarely) 'final' instead of 'virtual' [modernize-use-override,-warnings-as-errors]
48 | virtual ~Right() = default;
| ~~~~~~~ ^
| override
```
* Add assert(ptr) in register_instance_impl, deregister_instance_impl
* Proper bug fix
* Also exercise smart_holder_from_unique_ptr
* [skip ci] ChatGPT-generated bug fix: smart_holder::from_unique_ptr()
* Exception-safe ownership transfer from unique_ptr to shared_ptr
ChatGPT:
* shared_ptr’s ctor can throw (control-block alloc). Using get() keeps unique_ptr owning the memory if that happens, so no leak.
* Only after the shared_ptr is successfully constructed do you release(), transferring ownership exactly once.
* [skip ci] Rename alias_ptr to mi_subobject_ptr to distinguish from trampoline code (which often uses the term "alias", too)
* [skip ci] Also exercise smart_holder::from_raw_ptr_take_ownership
* [skip ci] Add st.first comments (generated by ChatGPT)
* [skip ci] Copy and extend (raw_ptr, unique_ptr) reproducer from PR #5796
* Some polishing: comments, add back Left/Right dtors for consistency within test_class_sh_mi_thunks.cpp
* explicitly default copy/move for VBase to silence -Wdeprecated-copy-with-dtor
* Resolve clang-tidy error:
```
/__w/pybind11/pybind11/tests/test_class_sh_mi_thunks.cpp:67:5: error: 'auto ptr' can be declared as 'auto *ptr' [readability-qualified-auto,-warnings-as-errors]
67 | auto ptr = new Diamond;
| ^~~~
| auto *
```
* Expand comment in `smart_holder::from_unique_ptr()`
* Better Left/Right padding to make it more likely that we avoid "all at offset 0". Clarify comment.
* Give up on `alignas(16)` to resolve MSVC warning:
```
"D:\a\pybind11\pybind11\build\ALL_BUILD.vcxproj" (default target) (1) ->
"D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj" (default target) (13) ->
(ClCompile target) ->
D:\a\pybind11\pybind11\tests\test_class_sh_mi_thunks.cpp(70,17): warning C4316: 'test_class_sh_mi_thunks::Diamond': object allocated on the heap may not be aligned 16 [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
D:\a\pybind11\pybind11\tests\test_class_sh_mi_thunks.cpp(80,43): warning C4316: 'test_class_sh_mi_thunks::Diamond': object allocated on the heap may not be aligned 16 [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\memory(2913,46): warning C4316: 'std::_Ref_count_obj2<_Ty>': object allocated on the heap may not be aligned 16 [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\memory(2913,46): warning C4316: with [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\memory(2913,46): warning C4316: [ [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\memory(2913,46): warning C4316: _Ty=test_class_sh_mi_thunks::Diamond [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.44.35207\include\memory(2913,46): warning C4316: ] [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
D:\a\pybind11\pybind11\include\pybind11\detail\init.h(77,21): warning C4316: 'test_class_sh_mi_thunks::Diamond': object allocated on the heap may not be aligned 16 [D:\a\pybind11\pybind11\build\tests\pybind11_tests.vcxproj]
```
The warning came from alignas(16) making Diamond over-aligned, while regular new/make_shared aren’t guaranteed to return 16-byte aligned memory on MSVC (hence C4316). I’ve removed the explicit alignment and switched to asymmetric payload sizes (char[4] vs char[24]), which still nudges MI layout without relying on over-alignment. This keeps the test goal and eliminates the warning across all MSVC builds. If we ever want to stress over-alignment explicitly, we can add aligned operator new/delete under __cpp_aligned_new, but that’s more than we need here.
* Rename test_virtual_base_at_offset_0() → test_virtual_base_not_at_offset_0() and replace pytest.skip() with assert. Add helpful comment for future maintainers.
* Revert type hint changes to int_ and float_
These two types do not support casting from int-like and float-like types.
* Fix tests
* Add a custom py::float_ caster
The default py::object caster only works if the object is an instance of the type.
py::float_ should accept python int objects as well as float.
This caster will pass through float as usual and cast int to float.
The caster handles the type name so the custom one is not required.
* style: pre-commit fixes
* Fix name
* Fix variable
* Try satisfying the formatter
* Rename test function
* Simplify type caster
* Fix reference counting issue
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* Avoid heap allocation for function calls with a small number of arguments
We don't have access to llvm::SmallVector or similar, but given the
limited subset of the `std::vector` API that
`function_call::args{,_convert}` need and the "reserve-then-fill"
usage pattern, it is relatively straightforward to implement custom
containers that get the job done.
Seems to improves time to call the collatz function in
pybind/pybind11_benchmark significantly; numbers are a little noisy
but there's a clear improvement from "about 60 ns per call" to "about
45 ns per call" on my machine (M4 Max Mac), as measured with
`timeit.repeat('collatz(4)', 'from pybind11_benchmark import
collatz')`.
* clang-tidy
* more clang-tidy
* clang-tidy NOLINTBEGIN/END instead of NOLINTNEXTLINE
* forgot to increase inline size after removing std::variant
* constexpr arg_vector_small_size, use move instead of swap to hopefully clarify second_pass_convert
* rename test_embed to test_low_level
* rename test_low_level to test_with_catch
* Be careful to NOINLINE slow paths
* rename array/vector members to iarray/hvector. Move comment per request. Add static_asserts for our untagged union implementation per request.
* drop is_standard_layout assertions; see https://github.com/pybind/pybind11/pull/5824#issuecomment-3308616072
* Revert "s/windows-2022/windows-latest/ in .github/workflows/{ci,pip}.yml (#5826)"
This reverts commit 852a4b5010.
* Add module-level skip for Windows build >= 26100 in test_iostream.py
* Changes suggested by at-henryiii
* Make function_record type subinterpreter safe
* Get rid of static state in implicit conversion
* style: pre-commit fixes
* Fix lambda
* Bump ABI because we added an internals member
* Set __module__ on the type instance to get rid of DepricationWarning
* Work around internal compiler error in CUDA by not using typedef
hopefully
* Make clang-tidy happy
* Use the same __module__ as pybind11_static_property
* style: pre-commit fixes
* Oops, find-replace error
* style: pre-commit fixes
* Move the once initialization to happen more behind the scenes
* Oops, need those casts...
* Undo implicit conversion change, will do a separate PR
* Use local_internals for function_record pointer to avoid ABI bump
* style: pre-commit fixes
* Get rid of this auto for readability
* Change back to using unqualified tp_name, set __module__ attribute, explicitly add Py_TPFLAGS_HEAPTYPE → does not resolve DeprecationWarning :-(
* Revert "Change back to using unqualified tp_name, set __module__ attribute, explicitly add Py_TPFLAGS_HEAPTYPE → does not resolve DeprecationWarning :-("
This reverts commit 9ccd6de9b7.
* Add Py_TPFLAGS_HEAPTYPE to be explicit (more readable).
* Remove obsolete PYBIND11_WARNING_DISABLE_...
* Make tp_plainname_impl, tp_qualname_impl more DRY
* Change PYBIND11_INTERNAL_MODULE_NAME → PYBIND11_DUMMY_MODULE_NAME
* Add a long comment to explain the tp_qualname_impl workaround.
* Rename local_internals::function_record → function_record_py_type
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* Failing unit test
* Potential fix for the issue of re-importing a multi-phase module
- When a module is successfully imported and exec'd, save its handle in a dict in the interpreter state
- Use a special Py_mod_create slot to look in the cache and return the cached handle if it is in the cache
- Don't re-run the user exec function if the module is in the interpreter's cache (implying it was already successfully imported)
* Oops, need to inline these.
* Clang-Tidy fixes
* Oops, debug code
* Add xfail for this GraalPy bug
* Remove static from these function defs, it was a cut-and-paste error in the first place.
* Fix test comment
* Proper error handling
* Oops
* Split up this line, but still just ignore failure .. if the module doesn't have the right properties to check the cache then just allow exec to run.
* Clean up - already looked up the name, just use that.
* Some compilers complain if the pointer isn't taken here, weird.
* Allow attribute errors to be thrown here, will be converted to import errors by the exception handler.
* Remove bogus incref, unconditionally expect a __spec__.name on the module
* Add PR to test comment
* style: pre-commit fixes
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* Use pytest.importorskip to get _xxsubinterpreters
* tests: use modern interpreter API
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* tests: try to fix beta2
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* fix: remove debug printout
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* tests: drop useless checks
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* tests: improve check for 3.14.0b3 and b4+
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* style: pre-commit fixes
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* Add overload to enable `.def(py::init(&rtrn_shcp))`. Also uncomment `.def(py::init(&rtrn_uqcp))` and `.def(py::init(&rtrn_udcp))`, which happen to work already (not sure what change in the past made those work).
* Introduce `construct_from_shared_ptr()` helper for DRY-ness.
* Revert PR #5700 production code change (pybind11/detail/struct_smart_holder.h).
```
git checkout b19489145b2c7a117138632d624809dfb3b380bb~1 include/pybind11/detail/struct_smart_holder.h
```
* Introduce `get_internals().get_memory_guarded_delete()`
* [skip ci] Only pass around `memory::get_guarded_delete` function pointer.
* [skip ci] Change a variable name for internal consistency. Add 3 x NOTE: PYBIND11_INTERNALS_VERSION needs to be bumped if changes are made to this struct.
* Add comment: get_internals().get_memory_guarded_delete does not need with_internals()
* Traverse all DSOs to find memory::guarded_delete with matching RTTI.
* Add nullptr check to dynamic_cast overload.
Suggested by ChatGPT for these reasons:
* Prevents runtime RTTI lookups on nullptr.
* Helps avoid undefined behavior if users pass in nulls from failed casts or optional paths.
* Ensures consistent return value semantics and no accidental access to vtable.
* Improve smart_holder unique_ptr deleter compatibility checks across DSOs:
* Replace RTTI-based detection of std::default_delete<T> with a constexpr check to avoid RTTI reliance
* Add type_info_equal_across_dso_boundaries() fallback using type_info::name() for RTTI equality across macOS DSOs
* Rename related flags and functions for clarity (e.g., builtin → std_default)
* Improves ABI robustness and clarity of ownership checks in smart_holder
* Trivial renaming for internal consistency: builtin_delete → std_default_delete
* Add get_trampoline_self_life_support to detail::type_info (passes local testing).
* Polish previous commit slightly.
* [skip ci] Store memory::get_guarded_delete in `detail::type_info` instead of `detail::internals` (no searching across DSOs required).
* Revert change suggested by ChatGPT. After double-checking, ChatGPT agrees this isn't needed.
* Minor polishing.
* add support for const pointers in smart pointers
* use c++11 compatible code
* add template parameter in test
* Make the const-removal clearly visible. This simplifies the production code changes significantly.
For background see: https://claude.ai/share/4085d9ab-a859-44cc-bb56-450e472f817a
* test without leaks
* add namespace for test
* rename test
* fix test compilation
* using namespace test_const_only_smart_ptr;
* fix smartptr in test
* smaller test body
* move test
* style: pre-commit fixes
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* chore: handle null for `py::scoped_critical_section`
* test: add tests for `py::scoped_critical_section`
* test: use assert instead of REQUIRE
* feat: enable faulthandler for pytest
* chore: use `__has_include(<barrier>)`
* fix: fix segmentation fault in test
* fix: test critical_section for no-gil only
* test: run new tests only
* test: ensure non-empty test selection
* fix: fix test critical_section
* fix: change Python 3.14.0b1/2 xfail tests to non-strict
* test: trigger gc manually
* test: mark xfail to `DynamicClass`
* Use `namespace test_scoped_critical_section_ns` (standard approach to guard against name clashes).
* Simplify changes in pybind11/critical_section.h and add test_nullptr_combinations()
* test: disable Python devmode in pytest
* test: add comprehensive comments for the tests
* test: add a summary comment for tests
* refactor: simpler impl
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* Refactor internals to use a holder that manages the PP
* Refactor internals to use a holder that manages the PP
* Fix cleanup/destruction issues.
* Fix one more destruction issue
Should now just be able to delete the internals PP on destruction
* Make clang-tidy happy
* Try to fix exception translators issue on certain platforms
Also fix a couple more pedantic warings
* Fix test, after internals is free'd it can come back at the same address
So instead, just make sure it was zero'd and don't try to compare the addresses.
Also a little code cleanup
* Comment tweak [skip ci]
* Switch to ifdef instead of if
* Re-enable subinterpreters in iOS
* style: pre-commit fixes
* Oops, this snuck in on merge
* fix: bump ABI version to 10
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* test: Added test case for visibility of common symbols across shared libraries
* style: pre-commit fixes
* tests: cmake target name fix
* tests: Added visibility test to ci
* tests: set the default visibility to hidden
* prototype/proof-of-concept fix: PYBIND11_EXPORT_GUARDED_DELETE
* Fix silly oversight: actually use PYBIND11_EXPORT_GUARDED_DELETE
* Update struct_smart_holder.h
* style: pre-commit fixes
* Update include/pybind11/detail/struct_smart_holder.h
* Update struct_smart_holder.h
* ci: fix addition to reusable-standard.yml
* Update CMakeLists.txt
* refactor: rename tests to test_cross_module_rtti
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* fix future type hints
Signed-off-by: Michael Carlstrom <rmc@carlstrom.com>
* style: pre-commit fixes
* remove unused var
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* remove union_helper
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* fix speelling error
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* base case for union_concat
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* style: pre-commit fixes
* add case for one descr
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* weakref and final test
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* Add acrpss_version_type_hint_checker
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* cleanup
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* style: pre-commit fixes
* remove test.pyi
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* use new unions and add fixture
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* timohl suggested cleanup
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* style: pre-commit fixes
* add missing auto
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* style: pre-commit fixes
* move operator| def
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* feat: scoped_critical_section
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* refactor: pull out to file
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* style: pre-commit fixes
* fix: GIL code in some compilers
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* fix: move to correct spot
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* refactor: use CPython macros to construct `PYBIND11_VERSION_HEX`
* docs: update release guide
* tests: add test to keep version values in sync
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* style: pre-commit fixes
* test: update version test
* test: update version test
* test: update version test
* chore: update code comments
* Update docs/release.rst
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* First draft a subinterpreter embedding API
* Move subinterpreter tests to their own file
* Migrate subinterpreter tests to use the new embedded class.
* Add a test for moving subinterpreters across threads for destruction
And find a better way to make that work.
* Code organization
* Add a test which shows demostrates how gil_scoped interacts with sub-interpreters
* Add documentation for embeded sub-interpreters
* Some additional docs work
* Add some convenience accessors
* Add some docs cross references
* Sync some things that were split out into #5665
* Update subinterpreter docs example to not use the CPython api
* Fix pip test
* style: pre-commit fixes
* Fix MSVC warnings
I am surprised other compilers allowed this code with a deleted move ctor.
* Add some sub-headings to the docs
* Oops, make_unique is C++14 so remove it from the tests.
* I think this fixes the EndInterpreter issues on all versions.
It just has to be ifdef'd because it is slightly broken on 3.12, working well on 3.13, and kind of crashy on 3.14beta. These two verion ifdefs solve all the issues.
* Add a note about exceptions.
They contain Python object references and acquire the GIL, that means they are a danger with subinterpreters!
* style: pre-commit fixes
* Add try/catch to docs examples to match the tips
* Python 3.12 is very picky about this first PyThreadState
Try special casing the destruction on the same thread.
* style: pre-commit fixes
* Missed a rename in a ifdef block
* I think this test is causing problems in 3.12, so try ifdefing it to see if the problems go away.
* style: pre-commit fixes
* Document the 3.12 constraints with a warning
* Apply suggestions from code review
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* ci: add cpptest to the clang-tidy job
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* noexcept move operations
* Update include/pybind11/subinterpreter.h
std::memset
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* Fix Python 3.8 type hints and add module prefix
These type hints are invalid in Python 3.8.
Add `typing.` prefix to remove ambiguity.
* style: pre-commit fixes
* Add module prefix to Union
* Rename macros
* Improve comment
* Comment out 3.8 type hint macros
Fixing this issue in Python 3.8 will require updating lots of tests. This can be added in a further pull request.
* Add Iterable module prefix
* Add module prefix to Iterator
* Add module prefix to Callable
* Re-add accidentally deleted brackets
* Add module prefix to Optional
* Add module prefix to Final
* Add module prefix to ClassVar
* Add module prefix to TypeGuard
* Add module prefix to TypeIs
* Add module prefix to NoReturn
* Add module prefix to Never
* Add module prefix to Literal
* Add module prefix to Callable
* Add module prefix to Sequence
* Add module prefix to Iterator
* style: pre-commit fixes
* Remove type hint macros
* style: pre-commit fixes
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
