jit: widen the walker CALL_ASSEMBLER fold past four pyre-local declines - #1266
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WalkthroughThe change expands self-recursive ChangesSelf-recursive CALL_ASSEMBLER folding
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟠 High · up to The PR broadens optimized recursive-call handling, but the current implementation can both produce incorrect exception source reporting and admit unsafe calls for some mutual callees, creating concrete runtime correctness risk; these issues should be fixed before merging. Sequence Diagram(s)sequenceDiagram
participant CallAssembler
participant FBWState
participant CalleeBodyFacts
participant ResidualTracking
participant TracebackRecorder
CallAssembler->>FBWState: read selfrec_ca_fold_active()
CallAssembler->>CalleeBodyFacts: validate foreign callee facts
CalleeBodyFacts-->>CallAssembler: return eligibility
CallAssembler->>ResidualTracking: execute folded call
ResidualTracking-->>ResidualTracking: exclude active-fold body effect
CallAssembler->>TracebackRecorder: emit compiled exception traceback
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| let call_py_pc = crate::py_coord::containing_py_pc_for_jitcode_pc(&jitcode.payload.metadata, op_pc); | ||
| matches!( | ||
| pyre_interpreter::pycode::lookup_exceptiontable(&code.exceptiontable, call_py_pc * 2), |
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When this fold runs inside an inlined non-portal callee, op_pc belongs to that callee, but jitcode and code come from fbw_mode.snapshot_sym, which is explicitly the outer portal anchor. Looking up the callee's PC in the portal's metadata and exception table can therefore miss a try covering the call; the emitted GUARD_NO_EXCEPTION then cannot resume into the callee's handler and lets the exception unwind through the wrong frame. Resolve the current framestack entry's jitcode/pycode for this positional check instead of the shared portal snapshot.
AGENTS.md reference: AGENTS.md:L32-L42
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| .iter() | ||
| .any(|f| f.w_code == w_code as usize); | ||
| if !admit_mutual { | ||
| if !admit_mutual && !foreign_callee_admits_call_assembler(w_code) { |
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Whenever an ordinary nonrecursive call_fn fails the earlier inline route, this new fallback admits it solely because three pyre-local body facts clear. Upstream rpython/jit/metainterp/pyjitpl.py:1376-1423 applies assembler_call only to the dedicated recursive portal operation, with its warmstate and green-argument checks; it has no equivalent body-fact substitution for generic calls. Replace this widening with the literal recursive-call generation/threading rather than preserving a faster generic-call shortcut, even if the benchmark numbers regress.
AGENTS.md reference: AGENTS.md:L288-L290
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In `@pyre/bench/synth/recursion_past_unroll_bound_from_loop.py`:
- Around line 4-8: Update the recursion fixture’s snapshot assertion to directly
verify the recursion-bound transition by adding the expected bound-hit or
CALL_ASSEMBLER counter. Preserve the existing aggregate assertions while
ensuring the n == 1 to n == 0 call in step reaches FBW_MAX_INLINE_RECURSION.
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pyre/bench/synth/ca_bridge_multiframe_resume_double_call.cranelift.jitstatspyre/bench/synth/ca_bridge_multiframe_resume_double_call.dynasm.jitstatspyre/bench/synth/recursion_memo_branch.cranelift.jitstatspyre/bench/synth/recursion_memo_branch.dynasm.jitstatspyre/bench/synth/recursion_past_unroll_bound_from_loop.cranelift.jitstatspyre/bench/synth/recursion_past_unroll_bound_from_loop.dynasm.jitstatspyre/bench/synth/recursion_past_unroll_bound_from_loop.pypyre/bench/synth/recursion_past_unroll_bound_from_loop.wasm.jitstatspyre/bench/synth/recursive_forced_frame_kept_stack.cranelift.jitstatspyre/bench/synth/recursive_forced_frame_kept_stack.dynasm.jitstatspyre/pyre-jit-trace/src/jitcode_dispatch/fbw_state.rspyre/pyre-jit-trace/src/jitcode_dispatch/inline_call.rspyre/pyre-jit-trace/src/jitcode_dispatch/residual_call.rs
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| # `step` recurses nine frames deep, two past `FBW_MAX_INLINE_RECURSION`, so the | ||
| # walker stops unrolling it and the call has to leave the inline route. What | ||
| # makes this shape distinct from every other recursion fixture is where the | ||
| # call sits: the driver is a `while` body that keeps `total` — a loop-carried | ||
| # operand — on the value stack underneath it. |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
rg -n -C 4 --glob '*.rs' --glob '*.py' '\bFBW_MAX_INLINE_RECURSION\b'Repository: youknowone/pyre
Length of output: 153
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- worktree ---'
git rev-parse --show-toplevel
printf '%s\n' '--- fixture ---'
f=$(fd -t f -i 'recursion_past_unroll_bound_from_loop.py' . | head -n 1)
printf 'file=%s\n' "$f"
cat -n "$f"
printf '%s\n' '--- related recursion symbols ---'
rg -n -i -C 3 'FBW|inline.?recurs|MAX_INLINE|unroll.?bound|CALL_ASSEMBLER' --glob '*.rs' --glob '*.py' --glob '*.toml' --glob '*.md' . | head -n 500
printf '%s\n' '--- matching files ---'
git ls-files | rg -i 'warmstate|full.?body|recurs|unroll|jitcode'Repository: youknowone/pyre
Length of output: 49517
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- recursion-related definitions and counters ---'
rg -n -i -C 5 'inline[ _-]*recursion|recursion[ _-]*depth|recursive.*(depth|inline)|max.*recurs|unroll.*recurs|recurs.*unroll|fbw.*(depth|inline)' \
pyre majit rpython --glob '*.rs' --glob '*.py' --glob '*.toml' --glob '*.md' | head -n 1000
printf '%s\n' '--- exact fixture stats ---'
for f in pyre/bench/synth/recursion_past_unroll_bound_from_loop.*.jitstats; do
echo "### $f"
sed -n '1,220p' "$f"
done
printf '%s\n' '--- recursion walk call sites ---'
rg -n -i -C 6 'walk.*(callee|recurs)|callee.*(walk|recurs)|inline.*call|try.*inline|CALL_ASSEMBLER' \
pyre/pyre-jit-trace/src pyre/pyre-jit/src majit/majit-metainterp/src rpython/jit/metainterp \
--glob '*.rs' --glob '*.py' | head -n 1200Repository: youknowone/pyre
Length of output: 50374
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- inline recursion state in Rust ---'
rg -n -C 12 'recursive_depth|push_inline|pop_inline|max_unroll_recursion|fbw_max_rec_unroll_depth|REC_UNROLL|recursion.*inline' \
majit/majit-metainterp/src pyre/pyre-jit-trace/src pyre/pyre-jit/src --glob '*.rs'
printf '%s\n' '--- upstream RPython recursion state ---'
rg -n -C 12 'recursive_depth|max_unroll_recursion|unroll_recursion|inline.*recurs|recurs.*inline' \
rpython/jit/metainterp rpython/jit/codewriter --glob '*.py'
printf '%s\n' '--- fixture stat keys and values ---'
for f in pyre/bench/synth/recursion_past_unroll_bound_from_loop.*.jitstats; do
echo "### $f"
python3 - "$f" <<'PY'
import json, sys
p=sys.argv[1]
try:
x=json.load(open(p))
except Exception as e:
print("not-json:", e)
print(open(p).read()[:4000])
raise SystemExit
def walk(v, path=""):
if isinstance(v, dict):
for k, val in v.items():
if any(s in str(k).lower() for s in ("recurs","unroll","call_assembler","inline","fbw","counter")):
print(path + "/" + str(k), "=", repr(val)[:500])
walk(val, path + "/" + str(k))
elif isinstance(v, list):
for i, val in enumerate(v):
walk(val, path + "/" + str(i))
walk(x)
PY
doneRepository: youknowone/pyre
Length of output: 50374
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- Rust recursive-call decision ---'
rg -n -C 20 'max_unroll_recursion|recursive_depth|is_recursive' \
majit/majit-metainterp/src/pyjitpl majit/majit-metainterp/src --glob '*.rs' \
| grep -v '^--$' | head -n 500
printf '%s\n' '--- RPython recursive-call decision ---'
rg -n -C 20 'max_unroll_recursion|recursive_depth|is_recursive' \
rpython/jit/metainterp --glob '*.py' | grep -v '^--$' | head -n 500
printf '%s\n' '--- stat file formats and relevant keys ---'
for f in pyre/bench/synth/recursion_past_unroll_bound_from_loop.*.jitstats; do
echo "### $f"
sed -n '1,180p' "$f"
doneRepository: youknowone/pyre
Length of output: 46496
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- exact recursive-depth implementation ---'
sed -n '5488,5514p' majit/majit-metainterp/src/compile.rs
printf '%s\n' '--- exact production recursive-inline wiring ---'
rg -n -C 8 'decide_recursive_inline|recursive_inline_decision|max_unroll_recursion' pyre/pyre-jit/src majit/majit-metainterp/src --glob '*.rs' | tail -n 300
printf '%s\n' '--- RPython source ---'
rg -n -C 10 'max_unroll_recursion|recursive_depth|should_unroll_one_iteration' rpython/jit/metainterp --glob '*.py' | head -n 400
printf '%s\n' '--- stat files ---'
for f in pyre/bench/synth/recursion_past_unroll_bound_from_loop.*.jitstats; do
echo "### $f ($(wc -c < "$f") bytes)"
head -c 3000 "$f"
printf '\n'
doneRepository: youknowone/pyre
Length of output: 50371
🏁 Script executed:
set -euo pipefail
for f in pyre/bench/synth/recursion_past_unroll_bound_from_loop.*.jitstats; do
echo "### $f"
wc -c "$f"
head -c 5000 "$f"
printf '\n'
done
printf '%s\n' '--- recursive decision implementation ---'
rg -n -C 18 'fn decide_recursive_inline|decide_recursive_inline\(' pyre majit --glob '*.rs' | head -n 300Repository: youknowone/pyre
Length of output: 12397
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- shared recursive decision ---'
sed -n '17242,17315p' majit/majit-metainterp/src/pyjitpl.rs
printf '%s\n' '--- FBW recursive-call handling ---'
rg -n -C 18 'max_unroll|recursive_depth|recursive.*inline|CallAssembler|disable_noninlinable' \
pyre/pyre-jit-trace/src/jitcode_dispatch/inline_call.rs \
pyre/pyre-jit-trace/src/jitcode_dispatch/*.rs | head -n 500
printf '%s\n' '--- benchmark snapshot gate references ---'
rg -n -C 8 'recursion_past_unroll_bound_from_loop|jitstats|snapshot|loops_compiled|bridges_compiled' \
pyre --glob '*.py' --glob '*.rs' --glob '*.toml' --glob '*.md' | head -n 600Repository: youknowone/pyre
Length of output: 50372
🏁 Script executed:
set -euo pipefail
printf '%s\n' '--- FBW bound definition and counter ---'
rg -n -C 12 'FBW_MAX_INLINE_RECURSION|fn fbw_inline_recursion_count' pyre/pyre-jit-trace pyre/pyre-jit --glob '*.rs'
printf '%s\n' '--- recursive fixture path prerequisites ---'
sed -n '3040,3080p' pyre/pyre-jit-trace/src/jitcode_dispatch/inline_call.rs
sed -n '3450,3465p' pyre/pyre-jit-trace/src/jitcode_dispatch/inline_call.rs
printf '%s\n' '--- all fixture comments and neighboring fixtures ---'
sed -n '1,90p' pyre/bench/synth/recursion_past_unroll_bound_from_loop.py
for f in pyre/bench/synth/fib_recursive.py pyre/bench/synth/selfrec_bridge_nontail_promote.py; do
echo "### $f"
sed -n '1,70p' "$f"
doneRepository: youknowone/pyre
Length of output: 17208
Add a direct assertion for the recursion-bound transition.
FBW_MAX_INLINE_RECURSION is 7. step(8, i) creates nine active calls, and the FBW counter excludes the root. The call from n == 1 to n == 0 therefore reaches the bound. The aggregate stats do not prove that this call used CALL_ASSEMBLER; add a bound-hit or CALL_ASSEMBLER counter to the snapshot gate.
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In `@pyre/bench/synth/recursion_past_unroll_bound_from_loop.py` around lines 4 -
8, Update the recursion fixture’s snapshot assertion to directly verify the
recursion-bound transition by adding the expected bound-hit or CALL_ASSEMBLER
counter. Preserve the existing aggregate assertions while ensuring the n == 1 to
n == 0 call in step reaches FBW_MAX_INLINE_RECURSION.
🤖 Codex parity reviewStatic analysis of this diff vs the local RPython/PyPy sources (commit 98e4be2). Files in the reviewed diff1. Regressions to PyPy parity introduced by this patchNone. 2. Other mismatches introduced by this patchNone. 3. Pre-existing mismatches (already present before this patch)
4. Structural adaptations
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| crate::py_coord::containing_py_pc_for_jitcode_pc(&jitcode.payload.metadata, op_pc); | ||
| matches!( | ||
| pyre_interpreter::pycode::lookup_exceptiontable(&code.exceptiontable, call_py_pc * 2), | ||
| Some((_target, depth, lasti)) if depth != 0 || !lasti |
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When a hot generator's eligible call succeeds while tracing but later raises StopIteration, the depth-zero/lasti whole-body entry is precisely what routes execution through INTRINSIC_STOPITERATION_ERROR and produces RuntimeError("generator raised StopIteration"); it does cover calls, not merely yields. Filtering that entry out lets this fold emit its GUARD_NO_EXCEPTION without a resumable generator-boundary handler, so the compiled path can expose or unwind the original StopIteration instead of performing the required conversion.
AGENTS.md reference: AGENTS.md:L249-L254
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https://github.com/youknowone/pyre/blob/385105a4002d44f0adf341c804ef69bc00e7f76a/pyre-jit-trace/src/jitcode_dispatch/inline_call.rs#L905
When a recursive call executes beneath FOR_ITER, this predicate deliberately leaves it on pyre's residual path solely because an unrelated live caller operand is reference-typed. Upstream _opimpl_recursive_call forwards the recursive call after the unroll limit without inspecting caller operand types, while the live MIFrame preserves those caller values; therefore the iterator-specific decline is a benchmark-driven structural shortcut rather than the required port. Preserve the caller frame state across CALL_ASSEMBLER and admit reference operands too, even if that temporarily regresses this benchmark.
AGENTS.md reference: AGENTS.md:L288-L290
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`try_walker_call_assembler_self_recursive` declined on four conditions that `_opimpl_recursive_call` / `do_residual_call` (`pyjitpl.py`) do not carry. Each is replaced by the narrower question it was standing in for: - Callee identity: a callee that is neither the walk's own code nor already on the framestack was refused outright. It is now admitted when its cell carries `JC_DONT_TRACE_HERE` (`can_inline_callable` false), the condition upstream puts on `assembler_call`, and its body carries no `raise`, no exception table and no `abort_permanent` marker — the same body facts the inline route screens on. - Caller exception table: the fold asked whether the caller's body held a `catch_exception` anywhere. It now asks whether the CALL's own coordinate falls inside a protected region, excluding the whole-body depth-zero `lasti` entry 3.14 wraps around every generator, per the discrimination `code_yields_inside_try` (`pycode.rs`) already makes. - Executed-body residual: the latch that declines a fold after a foreign non-pure residual ran now exempts the fold's own concrete-stamp executor by scope (`SELFREC_CA_FOLD_ACTIVE`) rather than by callee code identity, so a successful fold no longer latches the gate against later calls in the same walk. - Loop-carried operands: an InputArg below the call declined the fold regardless of what it held. A numeric accumulator no longer does; a live iterator still does, because folding under one costs the caller a compiled loop and a bridge on `recursive_call_frame_relocation`. Measured on dynasm, same tree, interleaved: a depth-8 recursion called a million times from a `while` body goes 1.21s -> 0.06s, depth-9 0.74s -> 0.06s; `recursive_call_frame_relocation`, `fib_recursive`, `generator_tree_recursion` and `foriter_call_resume_drops_iteration` are unchanged. `pyre/check.py` is 436/436 on both backends. Three synthetic jit-stats baselines are re-recorded for lower `guard_failures`: `ca_bridge_multiframe_resume_double_call` 3437 -> 3369, `recursion_memo_branch` 3554 -> 3491, `recursive_forced_frame_kept_stack` 800 -> 600. Assisted-by: Claude
… body `step` recurses nine frames deep, two past FBW_MAX_INLINE_RECURSION, and is called from a `while` body that keeps a numeric accumulator on the value stack under the call. No existing fixture holds that pair: in `fib_recursive` and `selfrec_bridge_nontail_promote` the recursion is itself the hot loop, and `recursive_call_frame_relocation` puts a `FOR_ITER` iterator below the call instead of a numeric operand. Records `max-pypy-ratio=6` and the three backend jit-stats baselines (loops_compiled=2, bridges_compiled=4, guard_failures=651 on all three). Assisted-by: Claude
`inline_call.rs` said `foreign_callee_admits_call_assembler` "reproduces the condition `_opimpl_recursive_call` puts on `assembler_call`". pyjitpl.py:1417 puts no condition there — once control reaches the fall-through it emits unconditionally. The screen is this fold's own precondition, which is what the function's own doc comment already says. The same correction applies to the message of 85d1621, which describes the foreign admission as requiring `JC_DONT_TRACE_HERE`; the gate reads body facts only and does not consult `can_inline_callable`. `decide_recursive_inline` and the `recursive_call` dispatcher both said "There is no `compile_tmp_callback` here". It is ported in `compile.rs` and two seams synthesise through it (`direct_assembler_call`, `get_or_make_portal_assembler_token_arc`). What is actually absent is a route from those seams to this decision: the predicate is pure in its five scalars, and the dispatcher reaches token resolution only through `Runtime::recursive_call_assembler_target`. Assisted-by: Claude
`should_inline` / `should_inline_with_ctx` / `should_inline_core` have had no callers since the MIFrame value-op layer was retired in #686; the FBW walker runs the same gate independently. They stay because they are the only metainterp-side home of two pieces of `_opimpl_recursive_call` that the live `recursive_decision` closure does not carry: the `dont_trace_here` side effect it defers until its producer slice is wired, and the not-tracing arm. A sweep of every in-tree and out-of-workspace consumer of majit-metainterp (aheui-jit, cel-jit, the vendored aheui) finds no reference to any of the three. Assisted-by: Claude
A trace that finishes with `exit_frame_with_exception` recorded its own root frame's traceback node only for the recording pass; the compiled trace carried no runtime record, on the premise that the interpreter would record it when the trace handed back the error. That premise holds only for a trace the interpreter entered. A CALL_ASSEMBLER entry comes from another trace's compiled code, and the descr dispatches to `handle_fail_exit_frame_with_exception`, which republishes the exception and returns into the caller's machine code — no interpreter sees the error, so the entered frame contributed no node. The traceback was one frame short per CALL_ASSEMBLER entry, i.e. one per `FBW_MAX_INLINE_RECURSION + 1` levels of a recursion the walker folds: `rec(9)` ending in `1 // 0` gave 10 `rec` frames interpreted and 9 compiled. `fbw_publish_exit_last_instr` already publishes the raise coordinate the node needs, and the emitted recorder falls back to that same field. The interpreter-entry case stays at one node: `screen_frame_already_recorded` clears `attach_tb` when the chain head already names the frame. Assisted-by: Claude
guard_failures fell on wasm the same way it did on the two native backends when the walker CALL_ASSEMBLER fold widened: ca_bridge_multiframe_resume_double_call 3437 -> 3369, recursion_memo_branch 3554 -> 3491, recursive_forced_frame_kept_stack 800 -> 678. The native baselines were recorded in 85d1621; these are the wasm halves. Assisted-by: Claude
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Pushed three more commits. The headline change is that the perf work turned out to be blocked on a pre-existing traceback defect, which is now fixed.
|
int_div_mod_raising_specialization.py |
OK |
rec(9)/1//0 cold vs hot traceback |
11 vs 11 (was 11 vs 10) |
r(8) ×1M from a while |
1.21s → 0.10s |
pyre/check.py dynasm |
ALL PASSED 437/437 |
pyre/check.py cranelift |
ALL PASSED 437/437 |
Three improved wasm jit-stats baselines re-recorded to match the native halves already in 6cafee0fe92.
One open item, deliberately not blessed
wasm synth/comprehension_object_append_hot regresses (bridges_compiled 14 → 17, guard_failures 2810 → 3410). It reproduces in isolation, so it is not noise, and it is attributable to this change adding an IR call on every top-level exception exit. It is not re-recorded. The narrowing that should fix it is to emit the node only for a trace that can be entered by CALL_ASSEMBLER rather than for every top-level exception exit.
The other wasm red (short_circuit_value_kept_stack) and the dynasm generator_tree_recursion jit-stats red are both present on main's own CI at 31caaba137e.
— commented by Claude
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| .iter() | ||
| .any(|f| f.w_code == w_code as usize); | ||
| if !admit_mutual { | ||
| if !admit_mutual && !foreign_callee_admits_call_assembler(w_code) { |
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When a non-recursive callee clears these body-fact checks after the earlier inline path declines, the fold selects w_code, its globals, and its assembler token from the recording-time value of r_args[0], but the emitted path never guards or otherwise consumes that callable. For example, a hot caller taking a function argument can trace with a branching f1 and later be invoked with f2; the same caller trace will still construct an f1 frame and enter f1's token, silently calling the wrong function. Emit an identity guard before admitting a foreign target, or keep this fold restricted to the recursive target whose identity is established structurally.
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In `@pyre/pyre-jit-trace/src/jitcode_dispatch/mod.rs`:
- Around line 3256-3282: Move fbw_publish_exit_last_instr(ctx,
recording_opcode_position) before record_top_level_application_traceback in the
runtime exception path, ensuring the traceback operation reads the current raise
coordinate for CALL_ASSEMBLER exceptions.
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majit/majit-metainterp/src/pyjitpl.rsmajit/majit-metainterp/src/pyjitpl/dispatch.rspyre/bench/synth/ca_bridge_multiframe_resume_double_call.wasm.jitstatspyre/bench/synth/recursion_memo_branch.wasm.jitstatspyre/bench/synth/recursive_forced_frame_kept_stack.wasm.jitstatspyre/pyre-jit-trace/src/jitcode_dispatch/inline_call.rspyre/pyre-jit-trace/src/jitcode_dispatch/mod.rs
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| // Emit at runtime too, not only for the recording pass. | ||
| // Leaving the node to the interpreter holds only for a | ||
| // trace the interpreter entered: `CALL_ASSEMBLER` enters | ||
| // this trace from another trace's compiled code, and the | ||
| // `exit_frame_with_exception` it finishes with dispatches | ||
| // to `handle_fail_exit_frame_with_exception`, which | ||
| // republishes the value and returns into the caller's | ||
| // machine code. No interpreter sees the error, so this | ||
| // frame contributes no node and the traceback is one | ||
| // frame short per `CALL_ASSEMBLER` entry. The | ||
| // interpreter-entry case stays single-node: the second | ||
| // record is screened by `screen_frame_already_recorded` | ||
| // clearing `attach_tb` for a frame the chain head names. | ||
| record_top_level_application_traceback( | ||
| ctx, | ||
| exc, | ||
| exc_concrete, | ||
| recording_opcode_position, | ||
| true, | ||
| false, | ||
| true, | ||
| ); | ||
| } | ||
| // The interpreter records this frame's own traceback node | ||
| // when the trace hands it the exception, and it reads the | ||
| // raise coordinate out of `frame.last_instr`. Compiled | ||
| // code never wrote that field, so publish it here. | ||
| // The node reads the raise coordinate out of | ||
| // `frame.last_instr`, on both routes — the interpreter's | ||
| // recorder and the emitted one, which falls back to that | ||
| // field. Compiled code never wrote it, so publish it here. | ||
| fbw_publish_exit_last_instr(ctx, recording_opcode_position); |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Publish last_instr before the runtime traceback record.
The new runtime traceback operation is recorded before fbw_publish_exit_last_instr. Its compiled execution therefore reads the previous frame.last_instr value. A CALL_ASSEMBLER exception can report the wrong source instruction.
Move fbw_publish_exit_last_instr(ctx, recording_opcode_position) before record_top_level_application_traceback.
Proposed fix
+ fbw_publish_exit_last_instr(ctx, recording_opcode_position);
if !recording_instruction_is_bare_reraise(ctx, opcode_position) {
record_top_level_application_traceback(
ctx,
@@
- fbw_publish_exit_last_instr(ctx, recording_opcode_position);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // Emit at runtime too, not only for the recording pass. | |
| // Leaving the node to the interpreter holds only for a | |
| // trace the interpreter entered: `CALL_ASSEMBLER` enters | |
| // this trace from another trace's compiled code, and the | |
| // `exit_frame_with_exception` it finishes with dispatches | |
| // to `handle_fail_exit_frame_with_exception`, which | |
| // republishes the value and returns into the caller's | |
| // machine code. No interpreter sees the error, so this | |
| // frame contributes no node and the traceback is one | |
| // frame short per `CALL_ASSEMBLER` entry. The | |
| // interpreter-entry case stays single-node: the second | |
| // record is screened by `screen_frame_already_recorded` | |
| // clearing `attach_tb` for a frame the chain head names. | |
| record_top_level_application_traceback( | |
| ctx, | |
| exc, | |
| exc_concrete, | |
| recording_opcode_position, | |
| true, | |
| false, | |
| true, | |
| ); | |
| } | |
| // The interpreter records this frame's own traceback node | |
| // when the trace hands it the exception, and it reads the | |
| // raise coordinate out of `frame.last_instr`. Compiled | |
| // code never wrote that field, so publish it here. | |
| // The node reads the raise coordinate out of | |
| // `frame.last_instr`, on both routes — the interpreter's | |
| // recorder and the emitted one, which falls back to that | |
| // field. Compiled code never wrote it, so publish it here. | |
| fbw_publish_exit_last_instr(ctx, recording_opcode_position); | |
| fbw_publish_exit_last_instr(ctx, recording_opcode_position); | |
| // Emit at runtime too, not only for the recording pass. | |
| // Leaving the node to the interpreter holds only for | |
| // a trace the interpreter entered: `CALL_ASSEMBLER` | |
| // enters this trace from another trace's compiled code, | |
| // and the `exit_frame_with_exception` it finishes with | |
| // dispatches to `handle_fail_exit_frame_with_exception`, | |
| // which republishes the value and returns into the | |
| // caller's machine code. No interpreter sees the error, | |
| // so this frame contributes no node and the traceback is | |
| // one frame short per `CALL_ASSEMBLER` entry. The | |
| // interpreter-entry case stays single-node: the second | |
| // record is screened by `screen_frame_already_recorded` | |
| // clearing `attach_tb` for a frame the chain head names. | |
| record_top_level_application_traceback( | |
| ctx, | |
| exc, | |
| exc_concrete, | |
| recording_opcode_position, | |
| true, | |
| true, | |
| ); | |
| } | |
| // The node reads the raise coordinate out of | |
| // `frame.last_instr`, on both routes — the interpreter's | |
| // recorder and the emitted one, which falls back to that | |
| // field. Compiled code never wrote it, so publish it here. |
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only still-valid issues, skip the rest with a brief reason, keep changes
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In `@pyre/pyre-jit-trace/src/jitcode_dispatch/mod.rs` around lines 3256 - 3282,
Move fbw_publish_exit_last_instr(ctx, recording_opcode_position) before
record_top_level_application_traceback in the runtime exception path, ensuring
the traceback operation reads the current raise coordinate for CALL_ASSEMBLER
exceptions.
The runtime half of the node was emitted beside the recording half, ahead of `fbw_publish_exit_last_instr` and `fbw_force_virtualizable_before_return`. It is the only consumer of the frame on that arm, so reading the frame there moved the escape ahead of the store-back: wasm synth/comprehension_object_append_hot went bridges_compiled 14 -> 17, guard_failures 2810 -> 3410. Emitting it after the store-back leaves the traceback unchanged — the publish has already settled `last_instr`, which the recorder falls back to — and returns that bench to its recorded baseline. Assisted-by: Claude
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| // publish above has already settled `last_instr`, which the | ||
| // recorder falls back to. | ||
| if !recording_instruction_is_bare_reraise(ctx, opcode_position) { | ||
| record_top_level_application_traceback( |
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When a callee entered through the newly widened CALL_ASSEMBLER path takes an attached bridge and that bridge exits with an uncaught exception, this runtime hook is never reached: the equivalent exit in bridge_subwalk.rs:583-595 still calls record_top_level_application_traceback(..., true, false) and terminates without emitting a runtime record. The recording invocation has a traceback node, but subsequent compiled bridge invocations return the exception directly to the caller's machine code, so the callee frame is missing from the observable traceback. Apply the same runtime emission to the bridge-exit path.
AGENTS.md reference: AGENTS.md:L14-L19
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What
A Python recursion deeper than the inline unroll bound, when it is called
from a loop body, never left the interpreter-residual path: one frame build
and one entry bridge per recursive call, for the whole run.
try_walker_call_assembler_self_recursive(
pyre/pyre-jit-trace/src/jitcode_dispatch/inline_call.rs) held fourdeclines with no counterpart in
_opimpl_recursive_call(
rpython/jit/metainterp/pyjitpl.py:1376-1436). Each is replaced by thenarrower question it stood in for:
contains_raise/has_exception_table/has_abort_permanent) all clearcatch_exceptionanywherepy_pcsits inside a protected region, excluding 3.14's whole-body generator entry (depth != 0 || !lasti)fbw_executed_body_residuallatch keyed on callee code identityselfrec_ca_fold_active()scope, so a successful fold stops latching against later calls in the same walkInputArgbelow the callThe third gate's discriminator is what the slot holds: a numeric accumulator
(
total = (total + step(8, i)) % MOD) keeps the fold worthwhile, a liveFOR_ITERiterator does not.Measurements
dynasm, same tree, interleaved, load 4:
r(8)x1M from awhiler(9)x1Mrecursive_call_frame_relocationfib_recursivegenerator_tree_recursionforiter_call_resume_drops_iterationpyre/check.py436/436 on both backends. Three jit-stats baselinesre-recorded downward (improvements):
ca_bridge_multiframe_resume_double_call3437→3369,recursion_memo_branch3554→3491,
recursive_forced_frame_kept_stack800→600.Second commit — the fixture
bench/synth/recursion_past_unroll_bound_from_loop.pyholds the shape thatwas uncovered: recursion two frames past
FBW_MAX_INLINE_RECURSIONwith anumeric loop-carried operand below the call. In
fib_recursiveandselfrec_bridge_nontail_promotethe recursion is itself the hot loop;recursive_call_frame_relocationputs an iterator below the call instead.Third commit — comment corrections
The message of 85d1621 describes the foreign admission as requiring
JC_DONT_TRACE_HERE. It does not: the gate reads body facts only and neverconsults
can_inline_callable. Corrected in the third commit, along with twoother claims about upstream that the investigation below refuted.
What was measured and rejected
Porting upstream's own admission condition onto this fold — it looks
obviously right and is not:
!can_inline_callableon every calleefib_recursive!can_inline_callable || count >= FBW_MAX_INLINE_RECURSIONfib_recursive0.28s → 2.45sThe reason, established afterwards: the condition is already at upstream's
site.
inline_call.rs:3050-3071runs pyjitpl.py:1382-1416 in order —can_inline_callable, then theFBW_MAX_INLINE_RECURSIONbound, then thedont_trace_here/disable_noninlinable_functionside effect. This fold isthe port of what comes after :1416 (
assembler_call = True→verify_green_args→do_recursive_call→do_residual_call( assembler_call=True)), and upstream's emitter carries no admissioncondition of its own. Feeding
can_inline_callableinto the emitter appliesthe gate twice, diverting callees upstream would have inlined onto
CALL_ASSEMBLER.
The
recursive_callop site itself is not portable here. Upstream emits itonly from
guess_call_kind == 'recursive'(codewriter/call.py:116-120), anidentity test
funcptr is jd.portal_runner_ptron a graph constant thatwarmspot plants by rewriting the portal graph (
warmspot.py:1054-1071).pyre's jitcode comes from a bytecode codewriter where the callee is a runtime
stack value, so that predicate has no input;
indirect_callnever yields'recursive'upstream (call.py:137-139), so there is no dynamic-calleeprecedent to copy either. The op is fully ported in majit
(
recursive_portal_call!→exec_recursive_call_assembler→bhimpl_recursive_call_*); its only consumer ismajit/examples/tl, a#[jit_interp]-annotated Rust interpreter, which has the static portal callupstream relies on.
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