Kotlin/Native: class/struct bridging and global variables#4
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June 18, 2026 13:36
…d type safety and clarity - Replace `String`-based type mapping with `KotlinType` enum for consistency across primitive and reference types. - Update `swiftTypeToKotlin` function to return `KotlinType?` and adjust type mapping logic accordingly. - Introduce `KotlinType.swift` to define the `KotlinType` enum, associated cases, and descriptions. - Refactor call argument handling to leverage `KotlinType` cases (e.g., `.string`, `.unit`). - Update code to switch on `KotlinType` enum instead of raw strings for type checks. - Ensure proper handling of `String` and other specific types with the new enum.
- Extend `swiftTypeToKotlin` and `KotlinType` to map `[UInt8]` to `UByteArray`. - Add struct `Pinning` to encapsulate pinning information for parameters requiring `usePinned`.
- Extend `swiftTypeToKotlin` and `KotlinType` to handle primitive and `String?` optional types.
…ion of primitives, UByteArrays and optionals
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July 2, 2026 17:37
…well as global variables - Extend `KotlinNativeSwift2KotlinGenerator` to generate Kotlin/Native wrapper classes for Swift nominal types. - Ensure proper memory management via `SwiftHandle` with cleanup using GC `createCleaner` or explicit `close()`. - Add global variable export with getter and setter wrappers
…d structs in Kotlin/Native
- Remove support for structs in Kotlin/Native wrapper generation. - Migrate memory management from `SwiftHandle` to `NSObject` for improved interoperability. - Update `Counter` test cases - Modify `nativeThunkName` logic to sanitize Cinterop symbols for Kotlin/Native compatibility. - Adjust Gradle build output structure to resolve IntelliJ indexing issues.
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What was done
Custom class & struct support — each imported Swift nominal type becomes a
Kotlin/Native wrapper class holding an
COpaquePointerto a Swift-allocatedbox. Supported member surfaces:
constructors, instance methods, static methods, and stored-property get/set.
Custom types work as parameters and return values on both top-level functions
and members.
SwiftKitKN — new Kotlin/Native library (
org.swift.swiftkit.kn)that exports
SwiftHandle: the opaque-pointer box that backs every wrapperinstance, guards the destroy thunk with a CAS
AtomicInt, and fires exactly oncevia deterministic
close()or GCcreateCleaner.Type support — constructors, instance/static
methods, and property accessors now handle all primitives,
String,[UInt8](params viausePinned, returns viamemScoped+out-count), optionals and custom imported class/struct types (passed as opaque box
pointers)
Top-level global variables — Swift
public vardeclarations at module scopeare emitted as Kotlin
val(getter-only) orvar(getter+setter) top-levelproperties.
Lifetime test suite — covers exact-once destroy on
close(), CASidempotency on double-close, no-leak across 100 cycles, shared-identity and
multi-owner lifetime, struct releasing a reference member, GC cleaner path, and
a Swift weak-reference probe that observes ARC deallocation independently of the
deinit counter.