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Kamil Paradowski
11f9a7f449
Summary: iOS TurboModules mapped a JS `ArrayBuffer` to `NSData` on arguments and `NSMutableData` on returns, so every crossing copied — and `NSMutableData` cannot alias foreign memory, so there was no way to express "these bytes live somewhere else". This adds `RCTArrayBuffer` (`packages/react-native/React/Base/`) as the ObjC representation of an `ArrayBuffer`. It carries an `isOwningBytes` flag: an owning buffer can be stored and read from any thread, a non-owning one aliases bytes valid only for the synchronous call that produced it. Codegen now emits `RCTArrayBuffer *` for `ArrayBufferTypeAnnotation` params (was `NSData *`) and returns (was `NSMutableData *`). ## Changelog: [IOS] [BREAKING] - Add `RCTArrayBuffer`, the ObjC representation of a JS `ArrayBuffer` for TurboModules, with an explicit byte-ownership contract Pull Request resolved: https://github.com/react/react-native/pull/57879 Test Plan: - `RCTTurboModuleArrayBufferTests` — 9 tests over the sync in-place path, `isOwningBytes` on a sync argument, returning one's own argument, the void/Promise copy paths, nesting, and a zero-length round trip. - `RCTTurboModuleTests.mm` adds `testNativeBackedArrayBufferIsAliasedAndKeepsBackingStoreAlive`. - `RCTSampleTurboModule` doubles its argument in place and returns the same buffer, covering the path end to end. - Codegen and C++ API snapshots regenerated. Reviewed By: cipolleschi Differential Revision: D115629409 Pulled By: christophpurrer fbshipit-source-id: a7ee6eadf99fd5f9f82fd2a95b0d3ff1369f4ddf
@react-native/codegen
Code generation tools for React Native. Parses TypeScript and Flow NativeModule and Component specs and generates the native binding code used by the New Architecture.