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Jeong, YunWonanddot 2a09ee02bd Align compiler and VM bytecode contracts with CPython 3.15 (#9105 )

* Align compiler and VM with final CPython 3.15 bytecode

Reconstruct the compiler-only baseline from validated487ae47 on the current main and frozen mapping prerequisitec78d811. Preserve the full source delta while dropping obsolete prerequisite ancestry; detailed old-to-new provenance is retained in the recovery artifact.

Assisted-by: OpenAI Codex: model identifier unavailable

* Fix final script validation, exception cleanup and private cache contracts

Replay reviewed compiler CI repairs 2191a9d, 1f1fe04, a2dacaf on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.

Assisted-by: OpenAI Codex: model identifier unavailable

* Align canonical compiler fixtures and generator frame state

Replay reviewed compiler CI repairs 476bb74 on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.

Assisted-by: OpenAI Codex: model identifier unavailable

* Preserve code-name owners and final warning and constant-fold contracts

Replay reviewed compiler CI repairs 6482adf on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.

Assisted-by: OpenAI Codex: model identifier unavailable

* Skip unavailable monitoring C API tests before tool registration

Replay reviewed compiler CI repairs 246c309 on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.

Assisted-by: OpenAI Codex: model identifier unavailable

* Assert exact final constant-list iterable folding

Replay reviewed compiler CI repairs 7ecedcf on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.

Assisted-by: OpenAI Codex: model identifier unavailable

* Align local monitoring events and exception lifecycle state with final 3.15

Replay reviewed compiler CI repairs ec206b1, 191fe58 on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.

Assisted-by: OpenAI Codex: model identifier unavailable

* Align 3.15 code objects and codegen with CPython

- Store co_consts, co_names, co_localsplusnames, co_localspluskinds,
  co_linetable, co_exceptiontable and co_name as objects on PyCode;
  build co_code and the varnames/cellvars/freevars tuples lazily in
  _co_cached, with co_code deoptimized through deopt_code.
- Move the compiler constant cache (_PyCode_ConstantKey,
  const_cache_insert) to builtins/code/const_cache.rs.
- Write every code field with w_object in marshal and pass the read
  field objects to MarshalBag::make_code through CodeFields.
- Emit RETURN_GENERATOR/POP_TOP in enter_scope and place SETUP_CLEANUP
  after them; drop the generator part of insert_prefix_instructions.
- Add PyCode::first_traceable (_co_firsttraceable) for
  _PyFrame_IsIncomplete and sys.monitoring.
- Follow the CPython DISABLE branches in sys.monitoring, the
  check_matched signature in warnings, the 3.15 % format error
  messages for str and bytes, code_returns_only_none, and the FOR_ITER
  stack analysis.
- Compute IMPORT_NAME flags with in_exception_handler.
- Replace the linetable/exceptiontable byte tests in codegen with
  dis(show_positions=True) insta snapshots in _opcode.
- Remove the opcode metadata verification tooling, byte-exact
  scripts, private cache tests and redundant snippets.
- Restore test_code.py and test_monitoring.py to v3.15.0 plus
  RUSTPYTHON markers.

Assisted-by: Claude Code:claude-opus-5-5

* Remove generator snippet checks covered by Lib/test

Drop extra_tests/snippets/generator_iterator_prefix.py. Its loop,
delegation, async, f_back and never-awaited checks are covered by
test_generators, test_coroutines, test_asyncgen, test_yield_from and
test_monitoring. Move the remaining checks into existing files:
genexpr prefix tracing and monitoring into stdlib_sys.py, and the
caller frame seen from the eager iterator into stdlib_sys_getframe.py.

Assisted-by: Claude Code:claude-opus-5-5

* Emit the generator prefix for top-level await modules

Module code compiled with PyCF_ALLOW_TOP_LEVEL_AWAIT and marked
ste_coroutine now starts with RETURN_GENERATOR; POP_TOP. The prefix and
RESUME emission move into emit_scope_prefix, shared by enter_scope and
the module entry points, as in codegen_enter_scope. Fixes
test_builtin.test_compile_top_level_await.

Assisted-by: Claude Code:claude-opus-5-5

* Allow the c_long cast in _opcode.stack_effect

c_long is i32 on Windows, where clippy reports the cast to i32 as
unnecessary.

Assisted-by: Claude Code:claude-opus-5-5

* Update malachite crates to 0.14.0

pymath requires malachite-bigint ^0, so the example projects, which
have no lock file, resolve it to 0.14.0 while the workspace pinned
0.13.0, and fail to build.

Assisted-by: Claude Code:claude-opus-5-5

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Co-authored-by: dot <dot@youknowone.org>