FrameLocalsProxy subscript reads one locals-plus slot; executioncontext reverse_debugging fold - #1373
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WalkthroughThe change updates frame-locals proxy operations, universal-newline normalization, exception-context lookup, and JIT/getframe diagnostic documentation. It adds parity tests for frame locals and regression tests for CRLF and lone-CR source handling. ChangesFrame locals proxy lookup
Universal-newline normalization
Exception context lookup
Diagnostic documentation updates
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The PR is mergeable with explicit owner awareness: benchmark attribution can be misleading if PYRE_QMUT_MAPDICT_FORCE is inherited or set to an empty value, so the controlled profiling environment should be made explicit. Sequence Diagram(s)sequenceDiagram
participant PythonSource
participant compile_source_with_opts
participant RustPythonCompiler
participant ASTConverter
participant ErrorReporter
PythonSource->>compile_source_with_opts: provide CRLF or lone-CR source
compile_source_with_opts->>RustPythonCompiler: compile normalized LF source
PythonSource->>ASTConverter: parse source
ASTConverter->>ASTConverter: normalize source before parsing and slicing
RustPythonCompiler-->>ErrorReporter: provide compiler locations
ErrorReporter->>ErrorReporter: normalize source before slicing
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| ) -> Result<Option<PyObjectRef>, crate::PyError> { | ||
| // `PyObject_Hash` runs before the scan, so an unhashable key is a | ||
| // `TypeError` even for a frame with no locals to compare against. | ||
| crate::baseobjspace::hash_w_strict(key)?; |
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When a custom key's __hash__ allocates or explicitly triggers a moving collection, this call can relocate the key before the callee creates its own root; the caller's root is updated, but the copied key parameter used by the subsequent pin_root(key) is not reloaded and can therefore become stale, leading to invalid accesses during the type check, equality scan, or error formatting. Pin the key before hash_w_strict and invoke hashing through the rooted slot.
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| roots.set(candidate_slot, pyre_object::w_str_new(name)); | ||
| crate::baseobjspace::eq_w(roots.get(candidate_slot), roots.get(key_slot))? |
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When a hashable custom key claims equality with a local name but returns a different hash, CPython 3.14's FrameLocalsProxy skips equality for that name and raises KeyError; this implementation discards the computed hash and compares against every locals-plus name, so it can incorrectly return the local value or propagate an unexpected __eq__ exception. Retain the requested hash and compare only candidate names whose hashes match.
AGENTS.md reference: AGENTS.md:L146-L150
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Inline comments:
In `@majit/majit-metainterp/src/jitprof.rs`:
- Around line 199-202: Update the documentation comment near the tally to state
explicitly that PYRE_QMUT_MAPDICT_FORCE is disabled when absent, and identify
try_walker_force_quasi_immut_namespace_write as the live producer path instead
of using “ships off” and “the namespace one.”
In `@pyre/extra_tests/parity_tests/framelocalsproxy_getitem_slot.py`:
- Around line 122-125: Add a direct comprehension test alongside scalar_slots
and the other slot helpers that accesses the active iteration variable via
frame.f_locals["i"], attempts to write through that mapping, and asserts that
the comprehension variable i retains its original value, covering both
hidden-slot reads and writes.
In `@pyre/pyre-interpreter/src/executioncontext.rs`:
- Around line 594-600: Remove or reject the
`translation.reverse_debugger`/`--revdb` configuration path until reverse
debugging is implemented in the interpreter. Update the relevant configuration
and translator handling so this option cannot be exposed or silently accepted,
while preserving the existing folded behavior for `reverse_debugging` and the
no-op hooks.
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Fix all unresolved CodeRabbit comments on this PR:
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majit/majit-metainterp/src/jitprof.rspyre/bench/synth/getframe_inline_subwalk_multiframe.pypyre/extra_tests/parity_tests/framelocalsproxy_getitem_slot.pypyre/extra_tests/snippets/compile_universal_newline.pypyre/pyre-interpreter/src/builtins.rspyre/pyre-interpreter/src/compile.rspyre/pyre-interpreter/src/eval.rspyre/pyre-interpreter/src/executioncontext.rspyre/pyre-interpreter/src/module/_ast/convert.rspyre/pyre-interpreter/src/pyframe.rspyre/pyrex/src/lib.rspyre/pyrex/src/repl.rs
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| // | ||
| // `if self.space.reverse_debugging: self._revdb_enter(frame)` folds | ||
| // away: the space carries `reverse_debugging = False` | ||
| // (baseobjspace.py:429) unless `config.translation.reverse_debugger` | ||
| // sets it (baseobjspace.py:444), and reverse debugging is not ported. | ||
| // Same fold `bytecode_only_trace` and `side_effects_ok` already carry. | ||
| // |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
🧩 Analysis chain
🏁 Script executed:
#!/usr/bin/env bash
set -euo pipefail
root="$(git rev-parse --show-toplevel)"
cd "$root"
rg -n -C 3 'reverse_debugger|reverse_debugging|_revdb_(enter|leave)' .
cargo check --features dynasm
cargo test --features dynasmRepository: youknowone/pyre
Length of output: 50373
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#!/usr/bin/env bash
set -euo pipefail
root="$(git rev-parse --show-toplevel)"
cd "$root"
printf '%s\n' '--- execution context ---'
sed -n '570,675p' pyre/pyre-interpreter/src/executioncontext.rs
sed -n '1410,1440p' pyre/pyre-interpreter/src/executioncontext.rs
printf '%s\n' '--- reverse-debugger configuration and object-space state ---'
rg -n -C 5 'reverse_debugger|reverse_debugging' \
majit/majit-translate/src/config \
majit/majit-translate/src/translator \
pyre/pyre-interpreter/src/baseobjspace.rs \
pyre/pyre-interpreter/src \
--glob '*.rs'
printf '%s\n' '--- workspace and feature declarations ---'
rg -n -C 3 'dynasm|workspace|pyre-interpreter' Cargo.toml '**/Cargo.toml' 2>/dev/null || true
printf '%s\n' '--- required checks ---'
cargo check --features dynasm
cargo test --features dynasmRepository: youknowone/pyre
Length of output: 27839
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#!/usr/bin/env bash
set -euo pipefail
root="$(git rev-parse --show-toplevel)"
cd "$root"
printf '%s\n' '--- option constraints ---'
sed -n '645,670p' majit/majit-translate/src/config/translationoption.rs
printf '%s\n' '--- reverse-debugger translator implementation ---'
fd -i 'revdb|reverse' majit pyre rpython pypy | head -80
rg -n -C 4 'mod revdb|gencsupp|prepare_database|reverse_debugger' \
majit/majit-translate/src pyre --glob '*.rs'
printf '%s\n' '--- object-space definitions and constructors ---'
rg -n -C 3 'struct ObjSpace|struct BaseObjSpace|reverse_debugging|translation\.reverse_debugger' \
pyre/pyre-interpreter/src --glob '*.rs'
rg -n -C 3 'ObjSpace::|BaseObjSpace::|new\(.*config|Config' \
pyre/pyre-interpreter/src --glob '*.rs' | head -200
printf '%s\n' '--- revdb module contents ---'
fd -i . majit/majit-translate/src/translator/revdb --type f --exec sh -c 'echo --- "$1"; sed -n "1,240p" "$1"' shRepository: youknowone/pyre
Length of output: 50373
🏁 Script executed:
#!/usr/bin/env bash
set -euo pipefail
root="$(git rev-parse --show-toplevel)"
cd "$root"
printf '%s\n' '--- option constraints ---'
sed -n '645,670p' majit/majit-translate/src/config/translationoption.rs
printf '%s\n' '--- reverse-debugger translator implementation ---'
fd -i 'revdb|reverse' majit pyre rpython pypy | head -80
rg -n -C 4 'mod revdb|gencsupp|prepare_database|reverse_debugger' \
majit/majit-translate/src pyre --glob '*.rs'
printf '%s\n' '--- object-space definitions and constructors ---'
rg -n -C 3 'struct ObjSpace|struct BaseObjSpace|reverse_debugging|translation\.reverse_debugger' \
pyre/pyre-interpreter/src --glob '*.rs'
rg -n -C 3 'ObjSpace::|BaseObjSpace::|new\(.*config|Config' \
pyre/pyre-interpreter/src --glob '*.rs' | head -200
printf '%s\n' '--- revdb module contents ---'
fd -i . majit/majit-translate/src/translator/revdb --type f \
--exec sh -c 'echo --- "$1"; sed -n "1,240p" "$1"' shRepository: youknowone/pyre
Length of output: 50373
Reject translation.reverse_debugger until reverse debugging is ported.
The --revdb option is exposed and passed to the translator, but ObjSpace has no reverse_debugging state and the hooks are no-ops. These calls are unreachable in the current interpreter, but the configuration still exposes an incomplete feature.
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minimal, and validate.
In `@pyre/pyre-interpreter/src/executioncontext.rs` around lines 594 - 600, Remove
or reject the `translation.reverse_debugger`/`--revdb` configuration path until
reverse debugging is implemented in the interpreter. Update the relevant
configuration and translator handling so this option cannot be exposed or
silently accepted, while preserving the existing folded behavior for
`reverse_debugging` and the no-op hooks.
Sources: Coding guidelines, MCP tools
`pytokenizer.py:654-662` universal_newline rewrites a line ending in `\r\n` or in a lone `\r` to one ending in `\n`, and `generate_tokens` calls it on every line it takes. Pyre's tokenizer takes the whole source rather than a line at a time, so the same rewrite is added as a whole-source pass. `compile_source_with_opts` runs the source through it, and `compile_source` now funnels through that function instead of calling `rp_compile` itself. `parse_to_object_with_opts` runs it as well, so `ast.parse` and the text `module_to_object` slices segments out of agree. The shell ran a windows-only `\r\n` replace; it runs the same rewrite on every platform now. `compile_err_to_syntax_error_maybe_incomplete` sliced `SyntaxError.text` and computed its offsets from the string its caller passed, which is the source before the rewrite: a `\r\n` input reported a line still carrying its carriage return, and a lone-`\r` input found no line at all because the original held no `\n`. It runs the rewrite on that string too. `dedent_command`'s comment claimed no carriage return reaches it. One does, and the `-c` dedent runs before the tokenizer's rewrite; the comment now records that ordering and what it means for a whitespace-and-`\r` line. `extra_tests/snippets/compile_universal_newline.py` covers `compile`, `exec`, `ast.parse`, raw and bytes literals, a lone `\r`, line numbers, a traceback line number, both SyntaxError shapes, and a `-c` argument. It passes under CPython 3.14, pypy3 and both backends, so it carries `gate=1`. Assisted-by: Claude
The `ABORT_COUNTER_KINDS` comment said nothing on this side could raise `ABORT_FORCE_QUASIIMMUT` and that the tally was a true zero. Two producers call `note_force_quasi_immut_abort`: `try_walker_force_quasi_immut_namespace_write` and `try_walker_force_quasi_immut_mapdict_write`, both in `pyre-jit-trace/src/jitcode_dispatch/residual_call.rs`. The mapdict one is gated behind `PYRE_QMUT_MAPDICT_FORCE`; the namespace one is not, and `MAJIT_STATS=1 PYRE_MC_DIAG=1` on `bench/synth/trace_too_long_effect_replay.py` prints `abrt_force_qmut=1`. Assisted-by: Claude
…uard failures The header said the recorded `guard_failures` was expected to fall once the positive-depth walk got its per-level lowering. That lowering is already in `try_walker_specialize_sys_getframe`, and it forces once per hop: deleting the inline-level decline in front of it leaves the fixture answering correctly, leaves `guard_failures` at exactly the recorded value, and takes the `Finish` trace from four `GuardNotForced` to seven. The failures are in `main`'s loop, where `mid(i)` is a residual `CallMayForce`, not in the trace that decline governs. The header now says that, and cites what `PYPYLOG=jit-summary:<file> pypy3 -P` reports for this file: one loop, no bridges, `forcings: 0` and no aborts, against the two traces pyre records. Comment only; the recorded counters are unchanged. Assisted-by: Claude
…fo's unused parameter `enter` called `_revdb_enter` under `!space.is_null() && is_tracing > 0`, and `leave` called `_revdb_leave` unconditionally. executioncontext.py:86 and :108-109 gate both on `space.reverse_debugging`, which comes from `config.translation.reverse_debugger` (baseobjspace.py:429, :444). Reverse debugging is not ported, so both arms fold away, as the third such arm in `bytecode_only_trace` and `baseobjspace.rs:side_effects_ok` already do. `sys_exc_info` took a `_for_hidden` argument that executioncontext.py:219 does not have and that its one caller passed `false`, and inlined the generator-chain walk. The walk is now `_get_topmost_exception` (executioncontext.py:278), reached through the `current_gen_or_coroutine` test the original has. Assisted-by: Claude
`FrameLocalsProxy.__getitem__` built the whole
`frame_locals_proxy_snapshot` dict and subscripted it. It now resolves
the key to a locals-plus index and reads that slot, falling back to the
frame's extras mapping and then to a `KeyError` -- the shape of
`framelocalsproxy_getitem`, `framelocalsproxy_getkeyindex` with
`read == true`, and `framelocalsproxy_getval`.
Two messages move with it. A key the frame does not answer reported the
mapping's own `KeyError(key)` and now reports
`KeyError("local variable '<repr>' is not defined")`; an unhashable key
reported the dict's key-flavoured `TypeError` and now reports the one the
hash raises before any slot is examined.
The read direction admits a `CO_FAST_HIDDEN` slot that the write
direction skips, so it does not share `fast_local_index`.
`locals_plus_names` carries the `co_localsplusnames` order the snapshot
open-coded -- varnames, then the cellvars that are not varnames, then
freevars -- and the snapshot walks it now too, so the index a name
resolves to is computed in one place.
Assisted-by: Claude
…ython `framelocalsproxy_getitem_slot.py` reads a bound local, an unbound slot, a name the frame has no slot for, an unhashable key, an extras entry, a cell slot and a freevar slot through `frame.f_locals`, and prints what each one answers. The value a hit returns is the same whether the proxy reads one slot or materializes the whole mapping first, so the miss text is what separates the two shapes -- which puts it here rather than in a snippet. Assisted-by: Claude
`framelocalsproxy_getkeyindex` hashes the key before it looks at any name, and the loop that compares non-interned names skips a name whose hash differs from the key's before calling `PyObject_RichCompareBool`. `locals_plus_value` computed the hash and discarded it, and it hashed the raw `key` parameter rather than the rooted copy, so a `__hash__` that moves objects left the following `pin_root` pinning a pre-move address. `fast_local_index` did not hash at all, so an unhashable key reached the extras dict and was reported in the dict's terms. Assisted-by: Claude
Reads and writes through a key that hashes like a local and one that does not, and a write with an unhashable key. Assisted-by: Claude
`framelocalsproxy_setitem` with no value and `framelocalsproxy_pop` both call `framelocalsproxy_getkeyindex` with `read == false` and only reach `f_extra_locals` for a key it places nowhere. Both had probed a materialized snapshot first, which decided the two cases below and built a whole mapping to reject one name. `del proxy[["x"]]` reported the snapshot dict's `cannot use 'list' as a dict key`, and `proxy.pop(["x"])` discarded that probe's error with `is_ok()` and went on to raise `KeyError(['x'])` where the hash raises `TypeError`. A delete no longer creates the extras dict that a store does, and a pop against a frame without one answers its default or reports the key. Assisted-by: Claude
…st cpython `framelocalsproxy_delete_slot.py` covers `del` and `pop` for a fast local, an unhashable key, a name with no slot, a default, and an extras entry deleted twice. The subscript fixture gains a class body's inlined comprehension, whose iteration variable is the one slot the read direction reports and the write direction skips. Assisted-by: Claude
…mmut tally Assisted-by: Claude
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Inline comments:
In `@majit/majit-metainterp/src/jitprof.rs`:
- Around line 199-203: Update the documentation around ABORT_FORCE_QUASIIMMUT to
state that PYRE_QMUT_MAPDICT_FORCE is unset in the default child environment,
not merely that no build sets it. Clarify that abrt_force_qmut=1 applies only to
the controlled run with the variable explicitly unset.
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…e test Assisted-by: Claude
🤖 Codex parity reviewStatic analysis of this diff vs the local RPython/PyPy sources (commit b8e08d9). Files in the reviewed diff1. Regressions to PyPy parity introduced by this patch
2. Other mismatches introduced by this patchNone. 3. Pre-existing mismatches (already present before this patch)
4. Structural adaptations
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1 participant
Eleven commits, all on the interpreter/documentation side. Rebased onto current
main.FrameLocalsProxysubscriptFrameLocalsProxy.__getitem__answered every lookup by building the wholeframe_locals_proxy_snapshotdict — an allocation plus one entry per boundlocal — and subscripting it. It now resolves the key to a locals-plus index
and reads that one slot, then the frame's extras mapping, then raises: the
shape of
framelocalsproxy_getitem,framelocalsproxy_getkeyindexwithread == true, andframelocalsproxy_getval(CPython 3.14.6Objects/frameobject.c).Two observable messages move with the shape, in both cases toward CPython:
KeyError('x')KeyError("local variable ''x'' is not defined")TypeError: cannot use 'list' as a dict key (unhashable type: 'list')TypeError: unhashable type: 'list'The read direction admits a
CO_FAST_HIDDENslot that the write directionskips, so it does not share
fast_local_index. Theco_localsplusnamesorder— varnames, then the cellvars that are not varnames, then freevars — was
open-coded in the snapshot; it now lives in
locals_plus_names, which bothreaders walk, so the index a name resolves to is computed once.
extra_tests/parity_tests/framelocalsproxy_getitem_slot.pyreads a boundlocal, an unbound slot, an absent name, an unhashable key, an extras entry, a
cell slot, a freevar slot and a class body's hidden slot, and prints what each
answers. On the pre-change binary it produces the left column above, so it
fails there.
The key scan (the two commits answering the Codex review)
framelocalsproxy_getkeyindexhashes the key before it looks at any name, andits second loop — the one that runs when no name is the interned key object —
skips a name whose hash differs from the key's before it reaches
PyObject_RichCompareBool. Neither port did that:locals_plus_valuecalledhash_w_strictonly for itsTypeError, threwthe hash away, and compared every name. A key that claims equality with a
name it does not hash like read as that name's slot instead of as absent.
It also hashed the raw
keyparameter rather than the rooted copy, so a__hash__that moves objects left the followingpin_rootpinning apre-move address.
fast_local_index, the write direction, did not hash at all. A write withan unhashable key reached the extras dict and was reported in the dict's
terms rather than as
TypeError: unhashable type: 'list'.Both now hash first and gate the comparison on the hash. An exact
strkeystill decides on WTF-8 bytes alone, which is complete for that case and is
what keeps the common lookup allocation-free.
The fixture gained a key that hashes like the local it names and one that does
not. On the pre-change binary the second one writes through to the fast local
(
other-hash write 3 3,extras keys []); with the hash gate it lands in theextras dict (
other-hash write 2 2,extras keys ['<key bound>']).The delete direction
framelocalsproxy_setitemwith no value andframelocalsproxy_popresolve thekey through that same scan and reach
f_extra_localsonly for a key it placesnowhere. Both had probed a materialized snapshot first, which decided two cases
it should not have:
del proxy[["x"]]TypeError: cannot use 'list' as a dict key (…)TypeError: unhashable type: 'list'proxy.pop(["x"])KeyError(['x'])TypeError: unhashable type: 'list'The
poprow is a wrong exception type, not just wrong text: the probe's errorwas discarded by
is_ok()and the extras dict then reported the miss. A deletealso no longer creates the extras dict that a store does, and a pop against a
frame without one answers its default or reports the key.
framelocalsproxy_delete_slot.pycovers both directions for a fast local, anunhashable key, an absent name, a default, and an extras entry deleted twice.
__contains__needs no change:framelocalsproxy_containsusesread == true,and delegating to the snapshot — which only carries bound values — already
agrees.
Review notes
inlined comprehension, not a function's. In a function the iteration variable
is an ordinary local and a proxy write goes straight through to it (verified
on CPython 3.14: the name reads back as the written value). Only in a class
body is it
CO_FAST_HIDDEN, which is where the read/write asymmetry thisfixture pins is observable.
translation.reverse_debugger.translate.ymlbuilds arevdb: [false, true]matrix, so making the option an error would break theRevDB job. This PR folded arms that are statically false; it did not change
the configuration surface.
Already on the branch
executioncontext: fold the tworeverse_debuggingarms (not ported, soexecutioncontext.py:86/:108-109are statically false) and dropsys_exc_info's_for_hiddenparameter, whichexecutioncontext.py:219does not have; the generator-chain walk becomes
_get_topmost_exception.bench/synth: the getframe fixture's header claimed a lowering that isalready in
try_walker_specialize_sys_getframe; corrected, countersunchanged.
jitprof: name the two real producers of the force-quasiimmut abort tally,which the comment called a true zero.
interpreter: rewrite\r\nand lone\rto\nbefore compiling asource.
Verification
Run in full on the rebased tree, after a fresh LLBC extract and both release
builds.
check.py --backend dynasmcheck.py --backend craneliftextra_tests/parity_tests/run.pyextra_tests/upstream/run.pycargo test -p pyre-interpreter -p pyre-jit-trace -p pyre-jit --features dynasmcargo fmt --all --checkextra_tests/run.py --gated-onlyexits rc=1, on the CPython arm only:bytearray_hex_receiver_export.pyandbytearray_percent_receiver_export.py(cpython 66/68, dynasm 68/68, cranelift 68/68). Both fixtures are
byte-identical to
origin/mainhere —git diff origin/main..HEAD --stat --on them is empty — and they pin
BufferErroragainst an oracle that does notraise it, so the red is structural and predates this branch.
Summary by CodeRabbit
Bug Fixes
Tests