GeezerVison

The PR adds host-side Python process detection on Linux, macOS, and Windows and exposes it through the stdlib remote-debugging module. It also changes profiler parsing, compiler warning filename handling, and selective function migration.

Changes: Remote debugging and profiler behavior

Layer / File(s)	Summary
Probe helpers and object-file lookup crates/host_env/src/remote_debugging/common.rs, crates/host_env/src/remote_debugging/object_file.rs, crates/host_env/src/lib.rs, crates/host_env/Cargo.toml, Cargo.toml	Adds shared cookie checks, read budgets, and object-file section lookup. Adds the target-specific dependencies and public module wiring used by the probes.
Platform process probes crates/host_env/src/remote_debugging/linux.rs, crates/host_env/src/remote_debugging/macos.rs, crates/host_env/src/remote_debugging/windows.rs	Adds process-memory and module inspection for Linux, macOS, and Windows. Each probe checks candidate Python runtime memory for the expected cookie and applies bounded reads.
Python remote-debugging API crates/host_env/src/remote_debugging/mod.rs, crates/stdlib/src/_remote_debugging.rs, crates/stdlib/src/_remote_debugging/binary.rs	Adds the Python-process check and capability constant. Updates profiler argument binding and numeric conversions. The binary reader extends table cursors to EOF and removes the parsed-end boundary check; zstd rejection remains unchanged.

Compiler warning filenames

Layer / File(s)	Summary
Warning filename propagation crates/vm/src/vm/compile.rs, crates/vm/src/stdlib/_symtable.rs	Compiler warnings retain the original filename object when available and use it when creating warning exceptions. The symtable path assigns the requested filename to converted compile errors and propagates warning-hook exceptions without changing their attributes.

Selective function migration

Layer / File(s)	Summary
Function selection and validation scripts/update_lib/cmd_migrate.py	Adds copying of selected complete top-level functions. Validates dependencies, exports, anchors, and migration hashes before writing, without importing or executing the modules.
CLI wiring and migration tests scripts/update_lib/cmd_migrate.py, scripts/update_lib/tests/test_selected_functions.py	Adds the --functions mode, makes it mutually exclusive with --assignments, and tests copying, validation failures, hash checks, and destination-change handling.

Cranelift dependency update

Layer / File(s)	Summary
Workspace Cranelift versions Cargo.toml	Updates the workspace Cranelift dependency versions from 0.135.0 to 0.136.3.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant PythonCaller
  participant StdlibRemoteDebugging
  participant HostEnv
  participant TargetProcess
  PythonCaller->>StdlibRemoteDebugging: call is_python_process(pid)
  StdlibRemoteDebugging->>HostEnv: convert pid and request process check
  HostEnv->>TargetProcess: inspect mappings or modules and read candidate memory
  TargetProcess-->>HostEnv: return process memory data
  HostEnv-->>StdlibRemoteDebugging: return probe result
  StdlibRemoteDebugging-->>PythonCaller: return boolean

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Possibly related issues

• RustPython/RustPython#6839: This PR updates _remote_debugging argument handling and binary parsing, which are part of the broader Python 3.15 standard-library alignment scope described by the issue.

Possibly related PRs

• RustPython/RustPython#9282: The PRs change the same compiler warning and symtable handling in compile.rs and _symtable.rs.
• RustPython/RustPython#9341: The PRs update the same workspace Cranelift dependency versions.

Suggested reviewers: youknowone

Merge Risk: Moderate · up to 4961c

On Linux the module reports live process-reading support although live profiling is not implemented. Consumers and tests that check this flag would take a path that fails. Set the constant to 0 before merging. Separately, the migration helper can misplace copied functions in files that contain form-feed or Unicode line-separator characters.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 10.26% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 78 functions across 13 files. (2 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title "Align profiler bindings and capability checks with Python 3.15" partially matches the changeset. The PR objectives describe aligning offline profiler argument binding (keyword args for writ…

Full details: Title check

Explanation

The title "Align profiler bindings and capability checks with Python 3.15" partially matches the changeset. The PR objectives describe aligning offline profiler argument binding (keyword args for write_sample, exit parameter names, set_stats numeric protocols), restoring PROCESS_VM_READV_SUPPORTED = 0, and restoring CPython finite-EOF table-count windows. However, the raw summary shows a much broader diff: a new remote-debugging host_env module with Linux, macOS, and Windows probes, new Cargo dependencies (mach2, object, Cranelift upgrade), compiler warning filename changes in vm/compile.rs, symtable changes, and a scripts/update_lib migration tool with selected-function copying. The title covers the profiler binding part but omits the large host-environment probing additions and the unrelated compiler, symtable, and scripts changes. The title is therefore related to a real part of the change but does not name the main point of the full changeset.

Full details: Docstring Coverage

Explanation

Docstring coverage is 10.26% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 78 functions across 13 files. (2 skipped: 2 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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