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Kamil Paradowski
5bb9639594
Summary: Android TurboModules mapped a JS `ArrayBuffer` to `java.nio.ByteBuffer`, copying every argument into a direct buffer — and `ByteBuffer` carries no ownership contract, so there was no way to express aliased or borrowed bytes for synchronous in-place access. This adds `ArrayBuffer` (`packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/ArrayBuffer.kt`) as the Java representation of an `ArrayBuffer`. It carries an `isOwningBytes` flag: an owning buffer can be stored and returned to JS, a non-owning one aliases bytes valid only for the synchronous call that produced it. Codegen now emits `ArrayBuffer` for `ArrayBufferTypeAnnotation` params (was `ByteBuffer`) and returns (was `ByteBuffer`). ## Changelog: [ANDROID] [ADDED] - Add `ArrayBuffer`, the Java representation of a JS `ArrayBuffer` for TurboModules, with an explicit byte-ownership contract Pull Request resolved: https://github.com/react/react-native/pull/57897 Test Plan: - Codegen Java spec and JNI C++ snapshot tests updated for `ArrayBuffer` param/return signatures. - `SampleTurboModule` doubles its sync argument in place and returns the same buffer, covering the zero-copy path end to end; `createNativeBuffer` allocates via `ArrayBuffer`. - C++ API snapshots regenerated. Reviewed By: javache Differential Revision: D115755247 Pulled By: christophpurrer fbshipit-source-id: de067789ad145b7202da721a02f838358c82f4d8
@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.