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9cf4bf0127
A `{.ffi.}` proc that returns a registered struct now delivers it natively
instead of CBOR-encoding it. The FFI-thread handler builds the return's
`<T>Pod` mirror on the heap (`nimToPod`) and stashes it on the request; the
callback receives it as a typed `const <T>*` (msg = pointer, len = sizeof), and
handleRes deep-frees it the instant the callback returns — callback-lifetime
ownership, the caller frees nothing.
Mechanics: FFIThreadRequest gains respPod/respPodLen/respPodFree fields that
handleRes honors ahead of the byte payload; the macro emits a per-proc
cdecl freer (`freePod` + `ffiCFree`) for the response POD. String and
seq[byte] returns still travel as raw bytes; the CBOR path (`<name>_cbor`) is a
separate handler and is unchanged. The C header documents the new return shape.
Validated end-to-end from C (EchoResponse, ComplexResponse with nested
seq/option graphs) including under ASAN — no UAF or double-free.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
nim-ffi
Allows exposing Nim projects to other languages
Example
examples/timer is now a self-contained Nimble project that imports nim-ffi directly.
Use cd examples/timer && nimble install -y ../.. && nimble build to compile the example.