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ffi 0.9: foreign-result chains — handle threaded through struct + List

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96/96 regression tests pass (+ffi-09-foreign-result-chain).

Opaque C-handle pattern that mirrors how real sx code threads
MTLBuffer*, AAssetManager*, file pointers, etc. through composite
sx values. C side has a trivial heap-int handle (`ffi_chain_make`
returning `void*`, `ffi_chain_bump` / `_peek` / `_dispose`). The sx
side exercises:

  1. Chained calls   — make -> bump -> bump -> peek; one handle
                       threaded through four FFI sites in sequence.
  2. Struct field    — `Counter { handle: *void; label: string; }`
                       hosts the handle; methods/accesses go through
                       `.handle` to feed back into C.
  3. List(*void)     — push N handles, iterate, peek each, iterate
                       again to bump each, iterate again to read
                       back. Catches any aliasing / lifetime breakage
                       when handles round-trip through the slice
                       backing of List.
This commit is contained in:
agra
2026-05-19 11:59:18 +03:00
parent d0ccb92ef7
commit 608ff34d55
5 changed files with 125 additions and 0 deletions
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tests/expected/ffi-09-foreign-result-chain.exit Normal file
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tests/expected/ffi-09-foreign-result-chain.txt Normal file
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peek after make = 100
bump(+5) = 105
bump(+3) = 108
peek after bumps = 108
ctr label = ctr-a
ctr peek = 50
ctr after bump = 57
list[0] peek = 0
list[1] peek = 10
list[2] peek = 20
list[0] after bump= 1
list[1] after bump= 11
list[2] after bump= 21