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Title: Tighten specialization guards and add send_none fastpath by youknowone · Pull Request #7359 · RustPython/RustPython · GitHub

Open Graph Title: Tighten specialization guards and add send_none fastpath by youknowone · Pull Request #7359 · RustPython/RustPython

X Title: Tighten specialization guards and add send_none fastpath by youknowone · Pull Request #7359 · RustPython/RustPython

Description: Summary Add send_none fastpath in Coro to skip the is_none check and type-error branch for the common case (generator iteration via for loops) Tighten CALL_METHOD_DESCRIPTOR_* guards to verify self type matches descr.objclass, matching CPython's CALL_METHOD_DESCRIPTOR type checks Allow list.append on subclasses in CALL_LIST_APPEND (use downcast_ref instead of downcast_ref_if_exact) Add specialization_eval_frame_active guard to prevent specializing CALL/CALL_KW/SEND/FOR_ITER_GEN when custom eval frames are active Fix FOR_ITER_GEN to deoptimize on guard miss and check running() state before send_none Fix SEND_GEN to deoptimize on guard miss and add send_none fastpath for None values Fix specialize_send to require exact generator/coroutine types Fix specialize_for_iter to validate END_FOR shape and jump delta bounds for generator specialization Route CALL_METHOD_DESCRIPTOR_FAST through CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS for correct nargs > 1 dispatch Add CallBuiltinFastWithKeywords fallback for builtin calls with effective_nargs > 1 Skip CALL/CALL_KW specialization for PyFunction when eval frame hook is active Test plan CI passes on all platforms (Ubuntu, macOS, Windows) test_bdb generator stepping works correctly with ForIterGen deoptimize path test_generators passes with send_none fastpath 🤖 Generated with Claude Code Summary by CodeRabbit Refactor Centralized coroutine send/result handling for more consistent iteration/stop error mapping and cleaner generator closure behavior. Made execution-frame specialization VM-aware to improve optimization decisions and safer fallback behavior during hot paths. Behavior Improved native method call flag inference and method flag availability, yielding more accurate method dispatch semantics (affecting native extensions and method calling behavior).

Open Graph Description: Summary Add send_none fastpath in Coro to skip the is_none check and type-error branch for the common case (generator iteration via for loops) Tighten CALL_METHOD_DESCRIPTOR_* guards to verify sel...

X Description: Summary Add send_none fastpath in Coro to skip the is_none check and type-error branch for the common case (generator iteration via for loops) Tighten CALL_METHOD_DESCRIPTOR_* guards to verify sel...

Opengraph URL: https://github.com/RustPython/RustPython/pull/7359

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Tighten specialization guards and add send_none fastpath https://github.com/RustPython/RustPython/pull/7359/files#top
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e4abe4a vm: align specialization guards with CPython patterns youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/e4abe4aa44f4441bcf8d3a604369922a9d61efc4
1d69c5b vm: tighten call specialization runtime guards youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/1d69c5b1b2a99e78f102bd9592397f7562849d6f
f0a235e vm: add send_none fastpath for generator specialization youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/f0a235ee59794389497877d3fb93ea3757e692ac
e518287 vm: restrict method-descriptor specialization to methods youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/e518287ea340ee3725fb2609b113b04b04b0d3ea
01cdfb5 vm: deopt call specializations on guard misses youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/01cdfb5253f2d386973fd692a4a461b998c29598
690921a vm: match CPython send/for-iter closed-frame guards youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/690921a2196d7c12ed70e41470d4b44700ffac6d
ed4b7fa vm: restrict len/isinstance specialization to builtins youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/ed4b7fae11f5361ea28fab64b9083799f53ee380
78dbbb0 vm: use exact-type guards for call specializations youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/78dbbb0152f39139d75e4a74392ac943b15aee45
01a4c27 vm: align class-call specialization flow with CPython youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/01a4c27014ab5b94200388fbb53b96d9bcec4003
397143b vm: prefer FAST call opcodes for positional builtin calls youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/397143b08f3ac6e40df1754bdf2bc01c24cdd26c
41e58d3 vm: add callable identity guard to CALL_LIST_APPEND youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/41e58d372ea71932ef1debb104f400d01b4ec6ea
c694fe1 vm: make CALL_LIST_APPEND runtime guard pointer-based youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/c694fe11f292fe04e7c28bc71233e5b94b710621
ab82f5b vm: align call guard cache and fallback behavior with CPython youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/ab82f5bffd143b8dfa6224c8c7a415899a1b0220
f630d01 vm: use base vectorcall fallback for EXIT-style call misses youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/f630d01d96c72843ee14dc391ef5b5ee92f41dc7
eeff412 vm: simplify CALL_LEN/CALL_ISINSTANCE runtime guards youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/eeff41296580f202e33bc202f0a179b1209805da
2a23d3b vm: infer call-convention flags for CPython-style CALL specialization youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/2a23d3badf6c27dfb7eb31add757e699711f7e65
c7d095a vm: check use_tracing in eval_frame_active, add SendGen send_none youknowone Mar 5, 2026 https://github.com/RustPython/RustPython/pull/7359/commits/c7d095a3ac8fdcbfcf6a40d694ab52392f31416c
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