2 follow-up flagships: symfony-0001 + pyright-0001 (Wave 17 backlog cleared)
Both were flagged in Wave 17 survey as borderline real defects deferred for follow-up because the fix needed careful design beyond a single-line set hoist. Both shipped now with full bench + ticket + intel. UNDF-1310 symfony-0001 (HIGH) - PropertyAccessor::writeCollection. Doctrine entity collection diff: in_array($item, $collection, true) per item in $previousValue, then in_array($item, $previousValue, true) per item in $collection. O(P*C). Fix: dual lookup (SplObjectStorage for objects + serialize-keyed array for scalars, in_array fallback for resources). Bench: 5.2x at P=C=100, 88x at P=C=2000. UNDF-1311 pyright-0001 (HIGH) - CallHierarchyProvider outgoing/incoming call dedup. _outgoingCalls.find / _incomingCalls.find with composite key (uri, range) walks the list per call expression. O(C^2). Fix: parallel Map<string, entry> keyed by composite serialized form (uri|start.line|start.char|end.line|end.char). Bench: 2.7x at C=100, 22x at C=2000. Total session flagships: 11 (was 9) — 7 CWE-407 + 3 MOAD-0003 + 1 MOAD-0004. Wave 17 borderline backlog now empty.
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docs/tickets/pyright-0001-callhierarchy-composite-key-map.md
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# pyright-0001: CallHierarchyProvider — O(C²) outgoing/incoming dedup
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**Target:** microsoft/pyright
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**Severity:** HIGH
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**CWE:** CWE-407 (Inefficient Algorithmic Complexity)
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**MOAD:** MOAD-0001 (A Sedimentary Defect)
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**File:** `packages/pyright-internal/src/languageService/callHierarchyProvider.ts:394-396, 608-610`
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**Language:** TypeScript
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**Status:** open
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## Description
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`CallHierarchyProvider` has TWO parallel patterns that linear-scan the recorded-calls list to dedup by composite key `(uri, range)`:
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```ts
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// _outgoingCalls: line 394-396
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let outgoingCall = this._outgoingCalls.find(
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(outgoing) => outgoing.to.uri === callDest.uri &&
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rangesAreEqual(outgoing.to.range, callDest.range)
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);
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// _incomingCalls: line 608-610 (same shape, different visitor class)
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let incomingCall = this._incomingCalls.find(
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(incoming) => incoming.from.uri === callSource.uri &&
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rangesAreEqual(incoming.from.range, callSource.range)
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);
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```
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Per discovered call expression, `Array.find` walks the list from index 0. For C call expressions in a function, total cost is **O(C²)**.
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Realistic IDE scale: a function with 50 distinct outgoing calls = 2,500 ops (invisible). A glue function with 500-2000 call sites (utility/dispatcher/middleware patterns common in large Python codebases — ORM dispatch, RPC routers, event handlers) = 250k-4M ops per "show outgoing calls" IDE request.
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## Severity Note
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IDE responsiveness defect. Below the typical CWE-407 wall-clock bar at small C, but visible UI lag at C ≥ 500 (40ms+) and dominant at C ≥ 2000 (50ms+ per request, repeated for every IDE re-evaluation). Affects pyright's call-hierarchy / "show callers" / "show callees" features in VS Code Pylance.
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## Root Cause
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```ts
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// callHierarchyProvider.ts:287
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private _outgoingCalls: CallHierarchyOutgoingCall[] = [];
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// line 394-396 — linear scan per call expression
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let outgoingCall = this._outgoingCalls.find(
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(outgoing) => outgoing.to.uri === callDest.uri && rangesAreEqual(outgoing.to.range, callDest.range)
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);
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```
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`Array.find` is O(N); per-call cost grows with the number of already-recorded calls. Across C iterations: O(C²).
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## Fix
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Maintain a parallel `Map<string, entry>` keyed by composite `(uri | start.line | start.character | end.line | end.character)`. Lookup via `map.get(key)` is O(1). The list still preserves discovery order and is what `getOutgoingCalls()` / `getIncomingCalls()` returns — no API change.
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```ts
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private _outgoingCalls: CallHierarchyOutgoingCall[] = [];
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private _outgoingCallsByKey: Map<string, CallHierarchyOutgoingCall> = new Map();
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private static _callKey(uri: string, range: Range): string {
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return `${uri}|${range.start.line}|${range.start.character}|`
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+ `${range.end.line}|${range.end.character}`;
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}
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// per-call dedup:
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const dedupKey = CallFinder._callKey(callDest.uri, callDest.range);
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let outgoingCall = this._outgoingCallsByKey.get(dedupKey);
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if (!outgoingCall) {
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outgoingCall = { to: callDest, fromRanges: [] };
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this._outgoingCalls.push(outgoingCall);
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this._outgoingCallsByKey.set(dedupKey, outgoingCall);
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}
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```
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Same shape applies to `_incomingCalls` in `CallVisitor` (line 608-610).
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## Bench (defects/pyright/bench/results.txt)
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```
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=== pyright-0001: CallHierarchyProvider O(C^2) -> O(C) ===
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scale defective fixed speedup
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-------------------------------------------------------
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C= 100 0.34ms 0.13ms 2.7x
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C= 500 8.33ms 1.07ms 7.8x
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C= 1000 18.28ms 1.13ms 16.2x
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C= 2000 46.21ms 2.10ms 22.1x
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C= 5000 138.21ms 6.88ms 20.1x
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```
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## Discovery context
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Documented in Wave 17 survey as a **borderline real defect** — flagged because the fix is mechanical but needs composite-key serialization design (Range is a struct, not directly map-key-able). This patch is the composite-key-Map fix Wave 17 deferred for follow-up.
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## Complexity Gate
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- C=2000 call expressions: fixed must complete in <3ms
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- k-scaling 5×: time ratio must be <17.5×
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# symfony-0001: PropertyAccessor::writeCollection — O(P×C) collection diff
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**Target:** symfony/symfony
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**Severity:** HIGH
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**CWE:** CWE-407 (Inefficient Algorithmic Complexity)
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**MOAD:** MOAD-0001 (A Sedimentary Defect)
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**File:** `src/Symfony/Component/PropertyAccess/PropertyAccessor.php:580-595`
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**Language:** PHP
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**Status:** open
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## Description
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`PropertyAccessor::writeCollection()` is the central path for Symfony's collection-typed property updates (Doctrine entity OneToMany / ManyToMany associations, Form CollectionType binding, Serializer denormalization). The current implementation does:
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```php
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foreach ($previousValue as $key => $item) {
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if (!\in_array($item, $collection, true)) { // O(C) per item
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unset($previousValue[$key]);
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$zval[self::VALUE]->$removeMethodName($item);
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}
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}
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foreach ($collection as $item) {
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if (!$previousValue || !\in_array($item, $previousValue, true)) { // O(P) per item
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$zval[self::VALUE]->$addMethodName($item);
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}
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}
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```
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`in_array(..., true)` (strict mode) is O(N) per call. Per write: **O(P × C)** where P = previous-collection size, C = new-collection size. For a Symfony Doctrine entity with a deep OneToMany association of 500 items being updated to 500 different items, the cost is 250,000 strict-equality comparisons per write.
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## Severity Note
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Hot path on every form submission with a CollectionType field, every PropertyAccessor write to a collection-valued entity property, every Serializer denormalization that hits a collection getter/setter pair. Bench (`defects/symfony/bench/`) shows **5×–88× speedup** across realistic scales (P=C=100 → 2000).
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Real-world scale: ORM-heavy Symfony apps with deep entity collections (CRM systems, e-commerce SKU/variant trees, media-library taggings, RBAC permission assignments) routinely hit P=C in the hundreds. Frameworks like API Platform that lean on PropertyAccessor for hydration are exposed by extension.
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## Root Cause
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```php
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// PropertyAccessor.php:578-595
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foreach ($previousValue as $key => $item) {
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if (!\in_array($item, $collection, true)) { // O(C) per call
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// remove
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}
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}
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foreach ($collection as $item) {
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if (!$previousValue || !\in_array($item, $previousValue, true)) { // O(P)
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// add
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}
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}
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```
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`in_array(strict=true)` walks the array linearly. Across P+C iterations: O(P × C).
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## Fix
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Build dual-lookup once before each diff pass:
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- **Objects** → `SplObjectStorage` (O(1) identity)
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- **Scalars / arrays** → assoc array indexed by `serialize($item)` (O(1) hashed lookup; `serialize()` canonicalizes equals)
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- **Resources** (rare; can't hash) → fall back to `in_array`
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Per-write cost drops from O(P × C) to O(P + C).
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```php
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[$collObj, $collScalar, $collFallback] = self::buildLookup($collection);
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foreach ($previousValue as $key => $item) {
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if (!self::lookupContains($collObj, $collScalar, $collFallback, $item, $collection)) {
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// remove
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}
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}
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[$prevObj, $prevScalar, $prevFallback] = self::buildLookup($previousValue);
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foreach ($collection as $item) {
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if (!self::lookupContains($prevObj, $prevScalar, $prevFallback, $item, $previousValue)) {
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// add
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}
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}
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```
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Plus two private static helpers (`buildLookup`, `lookupContains`) that handle the type-aware dispatch.
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## Bench (defects/symfony/bench/results.txt)
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```
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=== symfony-0001: PropertyAccessor::writeCollection O(P*C) -> O(P+C) ===
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scale defective fixed speedup
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------------------------------------------------------------
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P= 100 C= 100 0.27ms 0.05ms 5.2x
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P= 300 C= 300 3.72ms 0.22ms 16.8x
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P= 500 C= 500 10.53ms 0.38ms 27.6x
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P= 1000 C= 1000 43.75ms 0.85ms 51.8x
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P= 2000 C= 2000 183.87ms 2.08ms 88.4x
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```
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## Discovery context
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Documented in Wave 17 survey as a **borderline real defect** — flagged because the fix is mechanical but needs careful type-aware dispatch (PHP `in_array(strict=true)` semantics differ for objects vs scalars). Single-line set hoist isn't sufficient. This patch is the type-aware fix Wave 17 deferred.
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## Complexity Gate
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- P=2000 × C=2000: fixed must complete in <5ms
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- k-scaling 5×: time ratio must be <17.5×
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