resolve: memoize jsDeclarationReachable's candidate-side walk by bompus · Pull Request #566 · bompus/codegraph

bompus · 2026-10-27T23:49:59Z

Summary

The declarator walk in js_declaration_reachable (declaration point → parent chain → variable_declarator/function_declaration) depends only on the candidate — the ref enters only through visible(scope, refPoint).
On minified bundles (the pretix batch-4 straggler: d3/fabric/pdf.js), a hot name yields hundreds of same-file candidates and the climb re-ran once per ref. Memoize per candidate id: Some(scope) found-with-scope, Some(None) found-global, None no-declarator (verdict None).
Follows the existing lexical_scope_memo/python_bound_memo pattern; verdict-identical by construction (the walk is ref-independent).

Validation

kernel-resolve-parity.test.ts: 8/8.
Kernel quick build clean.
Owed before merge: pretix graph-count parity + batch-4 wall re-measure (memoization is a same-verdict transform, but the corpus gate stands per AGENTS.md).

Summary by CodeRabbit

Improvements
- JavaScript declaration resolution now reuses previously computed scope results while analyzing references, reducing repeated work. Cached results are checked against each reference’s position, and unsuccessful searches are also remembered during resolution. This can make analysis more efficient when multiple references involve the same candidate declaration, while maintaining scope-aware resolution behavior.

The parent-chain climb from a candidate's declaration point to its variable_declarator/function_declaration depends only on the candidate — the reference enters only through visible(scope, refPoint). On minified bundles a hot name yields hundreds of same-file candidates and the climb re-ran once per ref. Memoize the walk result per candidate id (three states: declarator found with scope, found global, not found). The per-ref cost collapses to a hash hit plus the visible() range check.

coderabbitai · 2026-10-27T23:50:07Z

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Reviewing files that changed from the base of the PR and between ad65295 and 9bca184.

Files selected for processing: 2

codegraph-kernel/src/resolve/js_scope_upstream.rs
codegraph-kernel/src/resolve/mod.rs

Walkthrough

The resolver now memoizes JavaScript declaration-scope lookup results by candidate node ID. It uses cached results to check declaration visibility at the current reference position.

Changes: JavaScript declaration scope

Layer / File(s)	Summary
Memoize declaration-scope lookups `codegraph-kernel/src/resolve/mod.rs`, `codegraph-kernel/src/resolve/js_scope_upstream.rs`	`KernelResolver` initializes a memo keyed by candidate node ID. `js_declaration_reachable` checks cached scopes and stores the binding scope or a no-match result.

Priority: Low

Merge Risk: Low · previous review ad652

A narrow cross-language resolution case can incorrectly accept or reject a reference; include the reference language in the memo key before merging.

Pre-merge checks: 6

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title names the main change: memoizing the candidate-side walk in jsDeclarationReachable. The raw summary shows js_scope_upstream.rs caching each candidate declaration's binding scope by node ID, …
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.
Suppressions Explained		The pull request adds memoization code, comments, a field, and its initialization. No changed line adds or broadens a lint, type-check, or compiler suppression directive.
User-Visible Changes Documented		The pull request changes only internal resolver memoization in two Rust files. The diff does not add, remove, or rename a CLI command or flag, MCP tool or argument, supported language or framework, ag…

Full details: Title check

Explanation

The title names the main change: memoizing the candidate-side walk in jsDeclarationReachable. The raw summary shows js_scope_upstream.rs caching each candidate declaration's binding scope by node ID, and mod.rs adding the memo field to KernelResolver. The PR objectives describe the same cache keyed by candidate ID, so the title matches the changeset. It is specific and concise, and it does not use vague terms.

Full details: User-Visible Changes Documented

Explanation

The pull request changes only internal resolver memoization in two Rust files. The diff does not add, remove, or rename a CLI command or flag, MCP tool or argument, supported language or framework, agent target, or config key. README.md and site documentation updates are therefore not required.

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bompus · 2026-10-27T23:52:13Z

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bompus · 2026-10-27T23:52:46Z

Corpus gate run on pretix (1,472 files): exact graph parity — 32799 nodes / 73404 edges / 165700 refs, identical to pre-change. Resolution wall flat (~4.73s vs ~4.75s): the memo removes the per-ref declarator-climb worst case but the corpus residual sits in other per-candidate gates on unflagged vendored files. Verdict-identical by construction; merging as a defensive micro-opt, not a headline win.

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Inline comments:
Review comments at @codegraph-kernel/src/resolve/js_scope_upstream.rs:
- Around line 318-347: Update js_decl_scope_memo in js_declaration_reachable to
key cached declaration scopes by both candidate ID and reference language; use
that composite key consistently for lookups and inserts so results from one
parser language are not reused for another.

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codegraph-kernel/src/resolve/js_scope_upstream.rs
codegraph-kernel/src/resolve/mod.rs

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CodeRabbit on #566: parsed_tree selects its parser from r.language, so the same candidate can walk a different tree under typescript vs javascript refs — memoizing by candidate id alone could reuse a scope computed under the wrong parse. Key by (candidate id, ref language); type alias for the three-state value keeps clippy's complexity gate.

bompus · 2026-10-28T00:05:19Z

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The #566 memo sat behind read_file, js_binding_tree (format! + tree LRU + Rc clone) and two js_unit_to_byte scans — the preamble was the residual cost the memo couldn't see. A hit now needs no tree; a missing or global scope needs no source either. Two adjacent same-loop wins: is_lexically_reachable's bare regex gains a one-entry memo keyed on reference_name, and prefer_adjacent_implementations skips its HashSet build unless a .d.ts candidate exists. pretix parity exact (32799/73404/165700); resolution 4.73s -> 4.57s.

Adds the six landed rows to the benchmark follow-up table and updates the measured head + README revision. pretix settle: 4.73 -> ~3.5 s (-26%, two profiled runs) across #569-#572 with exact graph parity.

coderabbitai Bot reviewed Oct 28, 2026

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Comment thread codegraph-kernel/src/resolve/js_scope_upstream.rs

bompus merged commit a403ef5 into fork/consolidated Oct 28, 2026
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bompus deleted the perf/js-decl-scope-memo branch October 28, 2026 00:26

bompus mentioned this pull request Oct 28, 2026

resolve: check js_decl_scope_memo before the file/tree loads #569

Merged

bompus mentioned this pull request Oct 28, 2026

docs: record #566–#572 follow-up merges, head 645abbb8 #573

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resolve: memoize jsDeclarationReachable's candidate-side walk - #566

resolve: memoize jsDeclarationReachable's candidate-side walk#566
bompus merged 2 commits into
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perf/js-decl-scope-memo

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