objcperf

Scope note: objcperf is Objective-C (MRC/ARC; NSString concat and NSLog in loops). Distinct from sibling swiftperf. On Linux the checker is a C line-window scanner over .m/.h (clang builds the tool); full Apple runtime not required for lint.

Objective-C performance notes, small examples, and objcperf-lint.

Part of XPerf. Shared docs: docs/README.md. Corpus-ready for the 2026-10-22 rule set. oc-nsstring-append-hot / oc-nslog-hot off (measured, not escalated). Date-formatter, JSON, and regular-expression hints are pending measure and are not part of that verdict. Two rules removed (tombstone, never got a slug). Guide v0.

ContentsCopy Anchor Link

• English guide (v0) — from docs/guide-src/
• objcperf-lint — two measured rules off; three hint rules pending measure; two rules removed (tombstone, never got a slug)
• Corpus pins

FocusCopy Anchor Link

Pre-size NSMutableArray, avoid stringByAppendingString in loops (prefer NSMutableString), keep NSLog out of hot loops.

Run lintCopy Anchor Link

cd packages/objcperf/objcperf-lint && make
./objcperf-lint path/to/sources
bash ../scripts/smoke-lint.sh
bash ../scripts/self-lint.sh

Exit 1 only for error-severity findings (hints exit 0 unless --strict-hints).

LayoutCopy Anchor Link

docs/guide-src/   chapter sources
docs/             assembled guide + corpus.md + evidence-policy.md
evidence/         two measured rules (both off); three pending hint notes; OC001/OC004 tombstones
examples/         tiny demos
objcperf-lint/      checker + fixtures
scripts/          smoke-lint.sh, self-lint.sh