Fix subclass right-op dispatch for Python classes by rlaisqls · Pull Request #7462 · RustPython/RustPython · GitHub

When both operands are Python-defined classes, the inherited right-op was incorrectly given priority over the base class left-op, even when the subclass didn't override anything.

class A:
    def __floordiv__(self, other): return "A.__floordiv__"
    def __rfloordiv__(self, other): return "A.__rfloordiv__"

class B(A):
    pass

A() // B()
# Expected: "A.__floordiv__" (B didn't override, so base left-op wins)
# Got:      "A.__rfloordiv__" (inherited right-op was incorrectly prioritized)

The root cause is that binary_op1 and ternary_op compared left(A) vs
right(B) slot pointers to decide whether two types share the same implementation.

Since RustPython uses separate left/right slot functions (unlike CPython's single combined slot),
this comparison always returned "different" for Python classes, causing the
subclass right-op path to fire unconditionally.

Fix:

Compare left(A) vs left(B) instead, which correctly identifies same-implementation types
Add method_is_overloaded (similar to CPython method_is_overloaded) to check whether the subclass actually overrides the right-op at the Python method level
Add right_method_name to PyNumberBinaryOp / PyNumberTernaryOp for the op-to-dunder mapping needed by method_is_overloaded
Apply to both binary_op1 and ternary_op

Summary by CodeRabbit

New Features
- Added support for right-side numeric operator methods so objects can provide r* implementations for binary and ternary numeric ops.
- New accessors and helpers expose and identify right-side operator slots for use by extensions and tooling.
Bug Fixes
- Improved operator dispatch so right-side methods and method overloading between related types are resolved more accurately.

Important

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📝 Walkthrough

Walkthrough

Adds explicit reflected ("right-side") numeric slots and helpers mapping ops to r* method names, and updates VM operator dispatch to consider right-side slots and subclass overloads when resolving binary and ternary operations.

Changes

Cohort / File(s)	Summary
Number protocol: right-side slots & helpers crates/vm/src/protocol/number.rs	Added right_method_name() for PyNumberBinaryOp and PyNumberTernaryOp; introduced public right_* AtomicCell fields on PyNumberSlots (e.g., right_add, right_subtract, right_multiply, right_power, right_matrix_multiply, etc.) and wired From<&PyNumberMethods> to populate them.
VM operator dispatch changes crates/vm/src/vm/vm_ops.rs	Added method_is_overloaded() helper and updated binary/ternary dispatch to prefer right-side slots when operand classes differ and to check subclass overloads (aligning behavior with CPython's method resolution semantics).

Sequence Diagram(s)

sequenceDiagram
    autonumber
    actor Caller
    participant VM as VM (vm_ops)
    participant Left as LeftType.__op__
    participant Right as RightType.__rop__
    VM->>Left: lookup left slot (left_*)
    alt left slot exists and returns value
        Left-->>VM: result or NotImplemented
    else classes differ or left returned NotImplemented
        VM->>Right: lookup right slot (right_*)
        alt subclass and method_is_overloaded -> true
            Right-->>VM: result or NotImplemented
        else
            Right-->>VM: NotImplemented
        end
    end
    VM-->>Caller: final result or raise TypeError

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

PyWrapperDescrObject and rewrite toggle_slot #6536 — Adds and wires right-side numeric slots and r* handling, overlapping slot definitions and dispatch.
Resolve number slots via MRO in PyNumber and operator, ensure inherit… #6222 — Adjusts number-slot resolution and operator dispatch logic with MRO-aware slot lookup; closely related to the subclass overload behavior changes.

Suggested reviewers

youknowone

Poem

🐰 I hop from left to right with cheer,
New r doors open wide and clear.
VM listens, checks subclass and art,
Reflected slots play their part.
A rabbit applauds this numeric start.

🚥 Pre-merge checks | ✅ 3 ✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix subclass right-op dispatch for Python classes' directly describes the main change: fixing incorrect dispatch of right-operator methods for Python-defined subclasses. It is specific, concise, and accurately reflects the primary objective of the PR.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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📦 Library Dependencies

The following Lib/ modules were modified. Here are their dependencies:

[x] lib: cpython/Lib/opcode.py
[ ] lib: cpython/Lib/_opcode_metadata.py
[x] test: cpython/Lib/test/test__opcode.py (TODO: 2)
[x] test: cpython/Lib/test/test_opcodes.py

dependencies:

opcode (native: _opcode, builtins)
- _opcode_metadata
- _opcode_metadata

dependent tests: (44 tests)

opcode: test__opcode test_code test_compile test_dis test_peepholer
- dis: test_ast test_compiler_assemble test_dtrace test_fstring test_inspect test_monitoring test_opcache test_patma test_positional_only_arg
  - bdb: test_bdb
  - inspect: test_abc test_argparse test_asyncgen test_buffer test_builtin test_collections test_coroutines test_decimal test_enum test_functools test_generators test_grammar test_ntpath test_operator test_posixpath test_pydoc test_signal test_sqlite3 test_traceback test_type_annotations test_types test_typing test_unittest test_yield_from test_zipimport test_zoneinfo
  - modulefinder: test_importlib test_modulefinder
  - trace: test_trace

[ ] test: cpython/Lib/test/test_class.py (TODO: 15)
[x] test: cpython/Lib/test/test_genericclass.py
[x] test: cpython/Lib/test/test_subclassinit.py

dependencies:

dependent tests: (no tests depend on class)

[ ] lib: cpython/Lib/collections
[x] lib: cpython/Lib/_collections_abc.py
[x] test: cpython/Lib/test/test_collections.py (TODO: 2)
[x] test: cpython/Lib/test/test_deque.py (TODO: 3)
[x] test: cpython/Lib/test/test_defaultdict.py (TODO: 1)
[x] test: cpython/Lib/test/test_ordered_dict.py (TODO: 8)

dependencies:

collections (native: _collections, _weakref, itertools, sys)
- _collections_abc
- _collections_abc, abc, annotationlib, copy, heapq, keyword, operator, reprlib, warnings

dependent tests: (302 tests)

collections: test_annotationlib test_array test_asyncio test_bisect test_builtin test_c_locale_coercion test_call test_collections test_configparser test_contains test_copy test_csv test_ctypes test_defaultdict test_deque test_descr test_dict test_dictviews test_enum test_exception_group test_file test_fileinput test_fileio test_frame test_funcattrs test_functools test_genericalias test_hash test_httpservers test_inspect test_io test_ipaddress test_iter test_iterlen test_json test_logging test_math test_monitoring test_ordered_dict test_pathlib test_patma test_pickle test_plistlib test_pprint test_pydoc test_random test_reprlib test_richcmp test_set test_shelve test_sqlite3 test_statistics test_string test_struct test_sys test_traceback test_tuple test_types test_typing test_unittest test_urllib test_userdict test_userlist test_userstring test_weakref test_weakset test_with
- ast: test_ast test_compile test_compiler_codegen test_dis test_fstring test_future_stmt test_site test_ssl test_type_comments test_ucn test_unparse
  - annotationlib: test_type_annotations test_type_params
  - dbm.dumb: test_dbm_dumb
  - inspect: test_abc test_argparse test_asyncgen test_buffer test_code test_coroutines test_decimal test_generators test_grammar test_ntpath test_operator test_posixpath test_signal test_yield_from test_zipimport test_zoneinfo
  - pyclbr: test_pyclbr
  - traceback: test_asyncio test_code_module test_contextlib test_contextlib_async test_dictcomps test_exceptions test_http_cookiejar test_importlib test_listcomps test_pyexpat test_setcomps test_socket test_subprocess test_threadedtempfile test_threading test_unittest
- asyncio: test_asyncio test_os test_sys_settrace
- concurrent.futures._base: test_concurrent_futures
- dbm.sqlite3: test_dbm_sqlite3
- difflib: test_difflib
- dis: test__opcode test_compiler_assemble test_dtrace test_opcache test_peepholer test_positional_only_arg
  - bdb: test_bdb
  - modulefinder: test_importlib test_modulefinder
  - trace: test_trace
- email.feedparser: test_email
- http.client: test_docxmlrpc test_hashlib test_unicodedata test_urllib2 test_wsgiref test_xmlrpc
  - urllib.request: test_sax test_urllib2_localnet test_urllib2net test_urllibnet
- importlib.metadata: test_importlib
- inspect:
  - cmd: test_cmd
  - dataclasses: test__colorize test_ctypes test_regrtest
  - pkgutil: test_pkgutil test_runpy
  - rlcompleter: test_rlcompleter
- logging: test_support
  - hashlib: test_hmac test_smtplib test_tarfile
  - multiprocessing.util: test_compileall test_concurrent_futures
  - venv: test_venv
- multiprocessing: test_fcntl test_memoryview test_multiprocessing_main_handling test_re
- platform: test__locale test__osx_support test_android test_baseexception test_cmath test_ctypes test_mimetypes test_platform test_posix test_shutil test_sysconfig test_time test_winreg
- pprint: test_htmlparser test_sys_setprofile
  - pickle: test_bool test_bytes test_bz2 test_codecs test_concurrent_futures test_ctypes test_email test_enumerate test_fractions test_http_cookies test_itertools test_list test_lzma test_memoryio test_minidom test_picklebuffer test_pickletools test_range test_slice test_str test_type_aliases test_unittest test_uuid test_xml_dom_minicompat test_xml_etree test_zipfile test_zlib test_zoneinfo
- queue: test_dummy_thread test_sched
- selectors: test_selectors
  - socket: test_epoll test_exception_hierarchy test_ftplib test_httplib test_imaplib test_kqueue test_largefile test_mailbox test_mmap test_poplib test_pty test_smtpnet test_socketserver test_stat test_timeout test_urllib_response
  - subprocess: test_atexit test_audit test_cmd_line test_cmd_line_script test_ctypes test_faulthandler test_file_eintr test_gc test_gzip test_json test_launcher test_msvcrt test_osx_env test_poll test_py_compile test_quopri test_repl test_script_helper test_select test_tempfile test_unittest test_utf8_mode test_wait3 test_webbrowser test_zipfile
- shlex: test_shlex
- shutil: test_filecmp test_glob test_importlib test_string_literals test_unicode_file
  - ctypes.util: test_ctypes
  - ensurepip: test_ensurepip
  - pathlib: test_importlib test_pathlib test_tomllib test_tools test_winapi test_zipapp test_zstd
  - tempfile: test_doctest test_importlib test_linecache test_pkg test_tabnanny test_termios test_tokenize test_winconsoleio test_zipfile64
  - zipfile: test_zipfile
- statistics:
  - random: test_complex test_context test_devpoll test_float test_heapq test_int test_long test_numeric_tower test_pow test_queue test_sort test_strtod test_thread
- string: test_email test_fnmatch test_secrets test_string
- threading: test_concurrent_futures test_ctypes test_fork1 test_importlib test_robotparser test_super test_syslog test_threading_local
  - dummy_threading: test_dummy_threading
  - sysconfig: test_tools
- traceback:
  - timeit: test_timeit
- urllib.parse: test_urlparse
- wave: test_wave

[ ] test: cpython/Lib/test/test_descr.py (TODO: 43)
[ ] test: cpython/Lib/test/test_descrtut.py (TODO: 3)

dependencies:

dependent tests: (no tests depend on descr)

[x] lib: cpython/Lib/dis.py
[ ] test: cpython/Lib/test/test_dis.py (TODO: 37)

dependencies:

dis

dependent tests: (70 tests)

dis: test__opcode test_ast test_code test_compile test_compiler_assemble test_dis test_dtrace test_fstring test_inspect test_monitoring test_opcache test_patma test_peepholer test_positional_only_arg
- bdb: test_bdb
- inspect: test_abc test_argparse test_asyncgen test_buffer test_builtin test_collections test_coroutines test_decimal test_enum test_functools test_generators test_grammar test_ntpath test_operator test_posixpath test_pydoc test_signal test_sqlite3 test_traceback test_type_annotations test_types test_typing test_unittest test_yield_from test_zipimport test_zoneinfo
  - ast: test_compiler_codegen test_future_stmt test_site test_ssl test_type_comments test_ucn test_unparse
  - asyncio: test_asyncio test_contextlib_async test_logging test_os test_sys_settrace test_unittest
  - cmd: test_cmd
  - dataclasses: test__colorize test_copy test_ctypes test_genericalias test_pprint test_regrtest
  - importlib.metadata: test_importlib
  - pkgutil: test_pkgutil test_runpy
  - rlcompleter: test_rlcompleter
  - trace: test_trace
  - xmlrpc.server: test_docxmlrpc test_xmlrpc
- modulefinder: test_importlib test_modulefinder

[x] test: cpython/Lib/test/test_format.py (TODO: 6)

dependencies:

dependent tests: (no tests depend on format)

[x] test: cpython/Lib/test/test_math.py
[x] test: cpython/Lib/test/test_math_property.py

dependencies:

dependent tests: (229 tests)

math: test_abstract_numbers test_asyncio test_builtin test_cmath test_compile test_complex test_ctypes test_decimal test_descr test_float test_fractions test_json test_long test_math test_math_property test_monitoring test_numeric_tower test_pow test_random test_socket test_statistics test_struct test_time test_zipfile
- fractions: test_buffer test_compare test_itertools test_operator test_os test_string
  - statistics: test_signal
- random: test_asyncio test_bisect test_bz2 test_collections test_context test_dbm_dumb test_deque test_devpoll test_dict test_dummy_thread test_email test_functools test_heapq test_hmac test_importlib test_int test_io test_logging test_lzma test_mmap test_ordered_dict test_poll test_posixpath test_pprint test_queue test_regrtest test_richcmp test_selectors test_set test_shutil test_sort test_strtod test_sys test_tarfile test_thread test_threading test_tokenize test_traceback test_unparse test_uuid test_weakref test_zipfile test_zlib test_zstd
  - email.generator: test_email
  - email.utils: test_httpservers test_smtplib test_urllib2
  - imaplib: test_imaplib
  - secrets: test_secrets
  - tempfile: test_argparse test_ast test_asyncio test_bytes test_cmd_line test_compileall test_concurrent_futures test_contextlib test_csv test_ctypes test_dis test_doctest test_ensurepip test_faulthandler test_filecmp test_fileinput test_genericalias test_hashlib test_importlib test_inspect test_launcher test_linecache test_mailbox test_modulefinder test_ntpath test_pathlib test_pickle test_pkg test_pkgutil test_posix test_py_compile test_pydoc test_runpy test_site test_string_literals test_subprocess test_support test_tabnanny test_tempfile test_termios test_threadedtempfile test_tomllib test_urllib test_urllib_response test_venv test_winconsoleio test_zipapp test_zipfile64 test_zoneinfo
- reprlib: test_reprlib
  - bdb: test_bdb
  - collections: test_annotationlib test_array test_asyncio test_c_locale_coercion test_call test_configparser test_contains test_copy test_ctypes test_defaultdict test_dictviews test_enum test_exception_group test_file test_fileio test_frame test_funcattrs test_hash test_ipaddress test_iter test_iterlen test_json test_pathlib test_patma test_plistlib test_shelve test_sqlite3 test_tuple test_types test_typing test_unittest test_userdict test_userlist test_userstring test_weakset test_with
  - dataclasses: test__colorize test_ctypes
- selectors: test_asyncio
  - socket: test_asyncio test_epoll test_exception_hierarchy test_ftplib test_httplib test_kqueue test_largefile test_poplib test_pty test_smtpnet test_socketserver test_ssl test_stat test_timeout test_urllib2net test_urllibnet test_xmlrpc
  - socketserver: test_wsgiref
  - subprocess: test_android test_asyncio test_atexit test_audit test_cmd_line_script test_ctypes test_dtrace test_file_eintr test_gc test_gzip test_json test_msvcrt test_osx_env test_platform test_quopri test_repl test_script_helper test_select test_sysconfig test_unittest test_utf8_mode test_wait3 test_webbrowser
- urllib.parse: test_urllib2_localnet test_urlparse
  - http.client: test_docxmlrpc test_ucn test_unicodedata
  - http.cookiejar: test_http_cookiejar
  - http.server: test_robotparser
  - logging.handlers: test_concurrent_futures
  - mimetypes: test_mimetypes
  - pathlib: test_dbm_sqlite3 test_importlib test_pathlib test_tomllib test_tools test_winapi test_zipfile
  - xml.sax.saxutils: test_sax

[x] lib: cpython/Lib/types.py
[ ] test: cpython/Lib/test/test_types.py (TODO: 6)

dependencies:

types

dependent tests: (52 tests)

types: test_annotationlib test_ast test_asyncgen test_asyncio test_builtin test_call test_code test_collections test_compile test_compiler_assemble test_coroutines test_decorators test_descr test_dis test_doctest test_dtrace test_dynamicclassattribute test_email test_enum test_exception_group test_fstring test_funcattrs test_generators test_genericalias test_hmac test_importlib test_inspect test_listcomps test_marshal test_monitoring test_opcache test_os test_positional_only_arg test_pprint test_pyclbr test_pydoc test_raise test_string test_subclassinit test_subprocess test_tempfile test_threading test_trace test_traceback test_type_aliases test_type_annotations test_type_params test_types test_typing test_unittest test_xml_etree test_xml_etree_c

Legend:

[+] path exists in CPython
[x] up-to-date, [ ] outdated

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@crates/vm/src/vm/vm_ops.rs`:
- Around line 13-25: Change method_is_overloaded to return PyResult<bool>
instead of bool and propagate any error from vm.identical_or_equal instead of
silencing it; specifically, in method_is_overloaded (and places calling it such
as binary_op1 and ternary_op) replace the unwrap_or(false) with the ? operator
(or explicit match to return Err) so exceptions from identical_or_equal bubble
up as PyErrs, update callers binary_op1/ternary_op to accept the PyResult<bool>
and propagate errors (or handle them) accordingly, and ensure the initial
get_attr checks still return Ok(false) when attributes are missing.
- Around line 183-197: The code is incorrectly dropping slot_bb when the
left-side slots compare equal, which loses the reflected fallback (right_*
trampoline). Always preserve slot_bb by assigning slot_b = slot_bb when slot_bb
is present, and separate that from the priority decision: use
class_b.fast_issubclass(class_a) && let Some(rop_name) =
op_slot.right_method_name(self) && method_is_overloaded(class_a, class_b,
rop_name, self) only to decide whether the RHS should run before the LHS (i.e.,
adjust ordering/priority), not to decide whether to queue the reflected slot at
all; update the logic around slot_a, slot_b, slot_bb, class_a, class_b, op_slot,
right_method_name, method_is_overloaded and fast_issubclass accordingly.

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Review profile: CHILL

Plan: Pro

Run ID: 0b5c98b5-467c-45ff-92d6-5298b5f4eb29

📥 Commits

Reviewing files that changed from the base of the PR and between 216006b and 131e5aa.

⛔ Files ignored due to path filters (1)

Lib/test/test_descr.py is excluded by !Lib/**

📒 Files selected for processing (2)

crates/vm/src/protocol/number.rs
crates/vm/src/vm/vm_ops.rs

Co-authored-by: Shahar Naveh <50263213+ShaharNaveh@users.noreply.github.com>

great!
ty for your recent contributions:)

Thank you 👍 👍

* Fix subclass right-op dispatch for Python classes * Separate fallback queueing from subclass priority in op dispatch

Fix subclass right-op dispatch for Python classes

131e5aa

rlaisqls force-pushed the fix/subclass-right-ops branch from 216006b to 131e5aa Compare March 18, 2026 12:29

coderabbitai Bot reviewed Mar 18, 2026

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Comment thread crates/vm/src/vm/vm_ops.rs

Comment thread crates/vm/src/vm/vm_ops.rs

Separate fallback queueing from subclass priority in op dispatch

b24d50e

rlaisqls force-pushed the fix/subclass-right-ops branch from 94c80c5 to b24d50e Compare March 18, 2026 13:23

ShaharNaveh reviewed Mar 18, 2026

View reviewed changes

Comment thread crates/vm/src/vm/vm_ops.rs Outdated

Add CPython source link to method_is_overloaded doc comment

b26a464

Co-authored-by: Shahar Naveh <50263213+ShaharNaveh@users.noreply.github.com>

ShaharNaveh approved these changes Mar 18, 2026

View reviewed changes

Remove expectedFailure from test_union_operators as it now passes

eeb8d14

youknowone approved these changes Mar 19, 2026

View reviewed changes

youknowone merged commit 79e17cb into RustPython:main Mar 19, 2026
16 checks passed

youknowone pushed a commit to youknowone/RustPython that referenced this pull request Mar 19, 2026

Fix subclass right-op dispatch for Python classes (RustPython#7462 )

b10d3c1

* Fix subclass right-op dispatch for Python classes * Separate fallback queueing from subclass priority in op dispatch

youknowone pushed a commit to youknowone/RustPython that referenced this pull request Mar 22, 2026

Fix subclass right-op dispatch for Python classes (RustPython#7462 )

c36926a

* Fix subclass right-op dispatch for Python classes * Separate fallback queueing from subclass priority in op dispatch

Copilot AI pushed a commit that referenced this pull request Mar 25, 2026

Fix subclass right-op dispatch for Python classes (#7462 )

e609658

* Fix subclass right-op dispatch for Python classes * Separate fallback queueing from subclass priority in op dispatch

Fix subclass right-op dispatch for Python classes by rlaisqls · Pull Request #7462 · RustPython/RustPython · GitHub

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Fix subclass right-op dispatch for Python classes - #7462

Fix subclass right-op dispatch for Python classes#7462
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RustPython:mainfrom
rlaisqls:fix/subclass-right-ops

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Fix subclass right-op dispatch for Python classes by rlaisqls · Pull Request #7462 · RustPython/RustPython · GitHub

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Fix subclass right-op dispatch for Python classes - #7462

Fix subclass right-op dispatch for Python classes#7462youknowone merged 4 commits intoRustPython:mainRustPython/RustPython:mainfrom rlaisqls:fix/subclass-right-opsrlaisqls/RustPython:fix/subclass-right-opsCopy head branch name to clipboard

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Fix subclass right-op dispatch for Python classes#7462
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rlaisqls:fix/subclass-right-ops

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