feat(codegen): native Swift generator + iOS example over the C ABI#59
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A SwiftPM package wrapping the timer library's native ABI behind an idiomatic `TimerNode` Swift class. `build-xcframework.sh` cross-compiles the Nim library to a static MyTimer.xcframework with three slices — ios-arm64 (device), ios-arm64-simulator, and macos-arm64 — assembling the .xcframework by hand so it works without a functioning Simulator toolchain (CI-friendly). The wrapper bridges the async FFI-thread callback to a synchronous Swift API with a semaphore and reads the typed EchoResponse struct out of the callback. The macos-arm64 slice makes the wrapper testable on the host: `swift test` passes against it. Device/simulator slices are the real iOS deployment artifacts. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Adds ffi/codegen/swift.nim, wired into the targetLang dispatch and exposed as the `genbindings_swift` nimble task. It emits an idiomatic Swift wrapper over the native (zero-serialization) C ABI from c.nim — importing the C structs through the CMyTimer clang module and never touching CBOR. The one piece of real logic is callback-shape selection: ack / string / struct decoding is chosen per proc from FFIProcMeta.kind + returnTypeName, and struct returns are copied out inside the callback to honour the deep-free-after-callback ownership rule. A single struct param's fields are flattened into the Swift method signature; ctors keep argument labels. Procs needing seq/Option or multi-struct param marshaling are skipped with a logged notice rather than emitting broken Swift, so the wrapper always compiles. That marshaling, events, and async mapping are the next increments. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Regenerates Sources/MyTimer/MyTimer.swift via `nimble genbindings_swift` (replacing the hand-written wrapper) and points the tests at the derived MyTimerNode class. Proves the generator reproduces the validated create/version/echo path: build-xcframework.sh + `swift test` pass 2/2 on the macOS slice. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Expanded scope: this PR now also adds the Swift generator that produces the wrapper, not just the hand-written example.
Validated: 🤖 Generated with Claude Code |
This was referenced Jun 13, 2026
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Adds an iOS example consuming the timer library's native (zero-serialization)
C ABI from Swift. Based on the native-FFI stack (#58) so it can use typed struct
returns.
What
examples/timer/ios/— a SwiftPM package with an idiomaticTimerNodeSwiftwrapper over the native ABI. Struct returns (
EchoResponse) come back as typedSwift values, read out of the C-POD inside the result callback.
build-xcframework.shcross-compiles the Nim library to a staticMyTimer.xcframeworkwith ios-arm64 (device), ios-arm64-simulator, andmacos-arm64 slices. The xcframework is assembled by hand (no
xcodebuild -create-xcframework), so it builds headless / in CI.Validation
CBOR symbols present).
swift testpasses(create / version / typed
echo/ a 200-iteration loop).🤖 Generated with Claude Code