"token" was overloaded (auth tokens, cgo handles, lexer tokens) and didn't say
what it is — a per-call correlation id linking an outgoing {.ffiHost.} call to
the answer that arrives later (possibly from another thread). Renamed across the
runtime (ffi_host / ffi_context), the macro, the exported C ABI (FFIHostFn,
<lib>_host_complete), the Go trampoline, and the tests; regenerated bindings.
The unrelated request-path cgo.Handle result-slot (also informally called a
"token" in go.nim comments) is left as-is — different mechanism.
16 host unit tests + the examples/host_demo Go round-trip stay green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
5a: record {.ffiHost.} procs in a compile-time registry (FFIHostMeta /
ffiHostRegistry), populated by the macro, so generators can see host fns.
5b: the Go generator emits an idiomatic wrapper over the host C ABI:
- a single //export cgo trampoline backs every host fn; a cgo.Handle in
userData selects the Go closure;
- the closure runs on a fresh GOROUTINE so the FFI thread is never blocked
(the non-blocking contract), then answers via <lib>_host_complete by token;
- a per-host `Set<Name>(func(string) (string, error))` method registers it.
Validated end to end with `go run` (examples/host_demo): Go UseToken -> Nim
{.ffi.} handler -> await fetchToken {.ffiHost.} -> Go trampoline -> goroutine
runs the closure -> host_complete -> future resolves on the loop thread ->
"token[TOK-session]" back in Go. Timer's Go output is unchanged (no host fns);
its regenerated .h just gains the always-exported host ABI decls.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Echo/Complex/Schedule now return typed Go structs (EchoResponse,
ComplexResponse, ScheduleResult); print their fields instead of an "ok" line.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Struct-returning methods now hand back a typed Go struct instead of the raw
CBOR/bytes. Since the native return POD is freed right after the callback, the
POD->Go conversion must happen in-callback: the generator emits a `fromC()`
reader per {.ffi.} type and, per struct-returning proc, an exported Go result
callback. The method calls the native entry point directly with that callback
and a `runtime/cgo.Handle` (boxed in a small C allocation so it travels through
the void* userData checkptr-safe), then blocks until the callback delivers the
typed value or error on the result slot.
String/raw-returning procs keep the existing C-bridge + condvar path. Validated
end-to-end (Echo/Complex/Schedule) including under `go run -race`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Update the native C example to cast each struct return's callback msg to its
`const <Type>*` and read it in-callback (EchoResponse, ComplexResponse), instead
of scanning opaque bytes. Regenerate the headers with the new return-shape note.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
A runnable main.go that constructs the timer with a TimerConfig, then calls
Echo (struct param), Complex (slice-of-structs + slice + two optionals) and
Schedule (three struct params) with idiomatic Go values — the methods the Go
generator used to skip. The Makefile builds the dylib next to the package
(cgo's ${SRCDIR} rpath finds it at runtime); README documents the Nim->Go type
mapping. Verified end-to-end with `go run`.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The Go generator previously emitted a `// SKIPPED` stub for any proc with a
struct, sequence or optional parameter, leaving Echo/Complex/Schedule
uncallable. Now that the native ABI carries those as flat C-POD structs, the Go
side can marshal them: emit an idiomatic Go struct per {.ffi.} type plus a
`toC()` that builds the matching `C.<Type>` (C.CString for strings, a C array
for seqs, present-flags for options, recursively for nested structs) and
returns cleanup funcs run via defer once the call returns. The native path
deep-copies every argument, so releasing the C buffers immediately is safe.
The C bridge already accepted struct-by-value params via the pass-through type
mapping; only the Go-side conversion and the `allSupported` gate needed work.
Bare seq/Option *top-level* params (not wrapped in a struct) remain skipped, as
the native ABI does not expose them either.
The generated package is now self-contained: the native `<lib>.h` is emitted
beside the `.go`, and the cgo directives use ${SRCDIR} so the header and the
staged library resolve without extra env vars. genbindings_go runs gofmt to
finalize column alignment.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
