efc482a055
`inline if OS == { case .macos: ... case .ios: ... else: ... }` is
already supported (see library/modules/platform/sdl3.sx:42 and
examples/38-build-config.sx:30). Cleaner than the chained
`inline if OS == .a; inline if OS == .b; ...` form the prior
commit used.
Same expected output — only the macOS arm survives codegen on the
host. Snapshot unchanged.
71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.8): `#foreign` C call sites
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// embedded inside the major sx surface constructs. None of these
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// touch a new ABI shape — they only verify lowering routes the call
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// through identically regardless of the enclosing context:
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//
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// 1. struct method body (Counter.next)
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// 2. protocol impl method body (impl Doubler for Counter)
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// 3. closure value body (closure { ... })
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// 4. comptime-gated branch (inline if OS == ...)
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#import "modules/std.sx";
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#import "modules/compiler.sx";
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#import c {
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#include "ffi-08-foreign-in-method.h";
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#source "ffi-08-foreign-in-method.c";
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};
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// ── 1. Struct method calling a #foreign fn ───────────────────────────
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Counter :: struct {
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seed: s32 = 0;
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next :: (self: *Counter) -> s32 {
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v := ffi_method_helper(self.seed);
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self.seed += 1;
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v;
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}
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}
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// ── 2. Protocol impl method calling a #foreign fn ────────────────────
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Doubler :: protocol {
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doubled :: (self: *Self) -> s32;
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}
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impl Doubler for Counter {
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doubled :: (self: *Counter) -> s32 {
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ffi_method_helper(self.seed) * 2;
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}
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}
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// ── 3. Closure body calling a #foreign fn ────────────────────────────
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make_adder :: (bias: s32) -> Closure(s32) -> s32 {
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closure((x: s32) -> s32 => ffi_method_helper(x) + bias);
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}
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main :: () -> s32 {
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c : Counter = .{ seed = 1 };
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// 1. struct method
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print("method next 1 = {}\n", c.next());
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print("method next 2 = {}\n", c.next());
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// 2. protocol method (still operating on the now-bumped Counter)
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print("protocol = {}\n", c.doubled());
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// 3. closure
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adder := make_adder(100);
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print("closure(5) = {}\n", adder(5));
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// 4. inline if OS branch — only one arm survives codegen on a
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// given target. `inline if X == { case ... }` reads cleaner
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// than chained `inline if X == .a; inline if X == .b; ...`.
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inline if OS == {
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case .macos: { print("inline if macos = {}\n", ffi_method_helper(7)); }
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case .ios: { print("inline if ios = {}\n", ffi_method_helper(7)); }
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case .linux: { print("inline if linux = {}\n", ffi_method_helper(7)); }
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else: { print("inline if other = {}\n", ffi_method_helper(7)); }
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}
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0;
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}
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