731fb8de64
12 plain-C examples that use #foreign incidentally (as FFI plumbing, output unchanged): 1200/1206/1209-1215/1220/1221/1222. Blanket keyword swap; all fn/global markers (no class forms in 12xx). Empty snapshot diff; corpus validates directly (all marker'd). Suite green (647 corpus / 444 unit, 0 failed). KEPT on #foreign (deferred to Phase 8 cutover): identity-#foreign feature tests (filename ffi-foreign-*: 1205/1207/1216/1218/1219), the equivalence test 1228, and the diagnostics that assert on #foreign source/message (1172/1174/1620). Comment-only provenance prose (1223/1229/1230/1231) left intact per Decision-6-recommended.
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. (i32) -> i32 — single-arg callback
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// 2. (*void, i32) -> i32 — 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 "1214-ffi-06-callback.c";
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};
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ffi_apply_callback :: (cb: (i32) -> i32 callconv(.c), value: i32) -> i32 extern;
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ffi_apply_callback2 :: (cb: (*void, i32) -> i32 callconv(.c), ctx: *void, v: i32) -> i32 extern;
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g_callback_hits : i32 = 0;
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g_callback_sum : i32 = 0;
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double_it :: (x: i32) -> i32 callconv(.c) {
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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: i32) -> i32 callconv(.c) {
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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 i32 through *i32.
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p : *i32 = xx ctx;
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p.* + v
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}
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main :: () -> i32 {
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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 : i32 = 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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