3855f2351e
vendors/ is a third-party namespace (stb_image, kb_text_shape, etc.);
test fixtures don't belong there. The .c/.h companion files for the
Phase-0 FFI baselines now sit alongside the .sx that drives them in
examples/, with matching basenames:
examples/ffi-01-primitives.{sx,c,h} <- was vendors/ffi_primitives/
examples/ffi-02-small-struct.{sx,c,h} <- was vendors/ffi_structs/
examples/ffi-03-large-struct.{sx,c,h} <- was vendors/ffi_large_struct/
examples/ffi-04-fp-struct.{sx,c,h} <- was vendors/ffi_fp_struct/
examples/ffi-05-string-args.{sx,c,h} <- was vendors/ffi_strings/
examples/ffi-06-callback.{sx,c,h} <- was vendors/ffi_callback/
examples/101-ffi-medium-struct.{sx,c} <- was vendors/ffi_medium_struct/
`#source` / `#include` paths in the .sx files become bare filenames
(no prefix) since imports.zig's base_dir resolution finds them
relative to the importing .sx file's directory.
`library/vendors/sx_ffi_resolve_test/` stays put — that one's the
whole point: regression coverage for the stdlib-search branch of
the resolution chain, so it must live where ONLY that branch can
find it.
94/94 regression tests pass.
60 lines
2.1 KiB
Plaintext
60 lines
2.1 KiB
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.6): sx function passed to C
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// as a function pointer; C invokes it; sx-side observable effect.
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// Mirrors the `app->onInputEvent` install pattern in
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// library/modules/platform/android.sx.
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//
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// Two arities covered:
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// 1. (s32) -> s32 — single-arg callback
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// 2. (*void, s32) -> s32 — pointer + value (onInputEvent shape)
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//
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// Plus a side-effect via a global so we can confirm the callback
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// actually fired (return value + state mutation both observable).
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#import "modules/std.sx";
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#import c {
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#source "ffi-06-callback.c";
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};
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ffi_apply_callback :: (cb: (s32) -> s32, value: s32) -> s32 #foreign;
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ffi_apply_callback2 :: (cb: (*void, s32) -> s32, ctx: *void, v: s32) -> s32 #foreign;
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g_callback_hits : s32 = 0;
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g_callback_sum : s32 = 0;
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double_it :: (x: s32) -> s32 {
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g_callback_hits += 1;
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g_callback_sum += x;
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x * 2;
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}
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add_with_ctx :: (ctx: *void, v: s32) -> s32 {
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g_callback_hits += 1;
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// Pass a sentinel via ctx to prove the pointer arg also survives the
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// round-trip — read it back as an s32 through *s32.
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p : *s32 = xx ctx;
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p.* + v;
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}
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main :: () -> s32 {
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// ── Single-arg callback ────────────────────────────────────────
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r1 := ffi_apply_callback(double_it, 21);
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print("callback returned = {}\n", r1);
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print("hits after first call = {}\n", g_callback_hits);
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print("sum after first call = {}\n", g_callback_sum);
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// Two more calls confirm the same fn pointer keeps working.
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ffi_apply_callback(double_it, 7);
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ffi_apply_callback(double_it, 11);
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print("hits after three calls = {}\n", g_callback_hits);
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print("sum after three calls = {}\n", g_callback_sum);
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// ── Two-arg callback with opaque ctx pointer ───────────────────
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ctx_val : s32 = 100;
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r2 := ffi_apply_callback2(add_with_ctx, xx @ctx_val, 42);
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print("ctx + value = {}\n", r2);
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print("hits after ctx callback = {}\n", g_callback_hits);
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0;
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}
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