This benchmark compares hot Objective-C dispatch shapes across the generated signature dispatch runtime and the PR #366 AOT direct-call runtime.

The benchmark body is plain NativeScript JavaScript:

• objc-dispatch-benchmarks.js

The runner can execute it in three modes:

• napi-node: fastest smoke run using the packaged macOS Node-API runtime.
• napi-ios: builds a temporary iOS app from the packaged @nativescript/ios template and runs it in Simulator.
• legacy-ios: temporarily injects the benchmark into the PR branch TestRunner app, builds it, runs it in Simulator, then restores the app entry point.

For V8 builds, gsd-off still uses the V8-native callback/marshalling path, but generated signature dispatch lookup is disabled so Objective-C calls fall back to the dynamic prepared/ffi_call path. This keeps the comparison focused on the generated dispatch win instead of accidentally measuring a hand-written direct objc_msgSend fast path.

For JSC, QuickJS, and Hermes builds, gsd-off follows the same rule: the engine-native callback and marshalling layer remains active, while only the generated typed invoker lookup is disabled.

Examples:

npm run benchmark:objc-dispatch -- --runtime napi-node --iterations 100000
npm run benchmark:objc-dispatch -- --runtime napi-ios,legacy-ios --iterations 250000
npm run benchmark:objc-dispatch -- --runtime all --include-napi-gsd-off

Useful options:

--legacy-repo /path/to/NativeScript/ios
--destination "platform=iOS Simulator,id=<UDID>"
--napi-package-tgz /path/to/nativescript-ios.tgz
--iterations 250000
--include-napi-gsd-off