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ffi 0.1: primitives baseline (#import c, one roundtrip per type)

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87/87 regression tests pass (was 86; +ffi-01-primitives).

vendors/ffi_primitives/{.h,.c} exposes a trivial identity roundtrip
per primitive C type — int/uint/short/ushort/long long/unsigned long
long/signed char/unsigned char/float/double/void* — plus two-arg
add helpers (int + double) for multi-arg ABI exercise. The sx-side
example imports the .h via `#import c { #include / #source }` and
prints each result; the snapshot in tests/expected pins today's
parameter + return ABI so Phase 1's #objc_call / #jni_call lowering
work can't silently regress primitive marshalling.

Two findings logged in current/CHECKPOINT-FFI.md's Known issues
section (current behavior, not new bugs): (1) c_import.zig maps
`signed char` -> `u8` not `s8`, and (2) sx integer-literal parser
rejects values >= 2^63 as overflow even when the receiver is u64.
Both worked around in this test without blocking the baseline.
This commit is contained in:
agra
2026-05-19 11:15:13 +03:00
parent 7d2e579667
commit bb80b7ca87
5 changed files with 99 additions and 0 deletions
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examples/ffi-01-primitives.sx Normal file
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// Phase 0 baseline (PLAN-FFI.md step 0.1): every primitive type passed
// in/out of a C `#foreign` fn via `#import c { #include / #source }`.
// Locks today's parameter + return ABI so Phase 1's lowering changes
// (`#objc_call` / `#jni_call`) can't silently regress us.
//
// Note: c_import maps `signed char` to sx `u8` (see c_import.zig:541)
// — narrow signed-char roundtrips are still surfaced here so any future
// mapping change shows up as a snapshot diff.
#import "modules/std.sx";
#import c {
#include "vendors/ffi_primitives/ffi_primitives.h";
#source "vendors/ffi_primitives/ffi_primitives.c";
};
main :: () -> s32 {
// Signed roundtrips
print("ffi_id_int(-42) = {}\n", ffi_id_int(0 - 42));
print("ffi_id_short(-1234) = {}\n", ffi_id_short(0 - 1234));
print("ffi_id_s64(huge) = {}\n", ffi_id_s64(9000000000000000000));
// Unsigned roundtrips
print("ffi_id_uint(0xDEADBEEF) = {}\n", ffi_id_uint(0xDEADBEEF));
print("ffi_id_ushort(0xFFFF) = {}\n", ffi_id_ushort(0xFFFF));
print("ffi_id_u64(0x7FEE...) = {}\n", ffi_id_u64(0x7FEEDFACECAFEBEE));
// Narrow char roundtrips (both map to u8 in current sx)
print("ffi_id_schar(127) = {}\n", ffi_id_schar(127));
print("ffi_id_uchar(255) = {}\n", ffi_id_uchar(255));
// Floating point
print("ffi_id_f32(3.5) = {}\n", ffi_id_f32(3.5));
print("ffi_id_f64(1.5) = {}\n", ffi_id_f64(1.5));
// Pointer roundtrip — proves *void survives the boundary
sentinel : s32 = 42;
p_in : *void = xx @sentinel;
p_out := ffi_id_ptr(p_in);
addr_in : u64 = xx p_in;
addr_out : u64 = xx p_out;
print("ffi_id_ptr roundtrip = {}\n", addr_in == addr_out);
// Arithmetic helpers — exercise multi-arg ABI
print("ffi_add_int(7, 8) = {}\n", ffi_add_int(7, 8));
print("ffi_add_double(0.25, 0.75) = {}\n", ffi_add_double(0.25, 0.75));
0;
}