831b46ac35
97/97 regression tests pass (94 expected updated; +issue-0037 from the prior commit). The companion `94-foreign-global-helper.sx` ALSO declares `__stdinp : *void #foreign;`. Two sx files referencing the same extern symbol must link cleanly — LLVM dedupes the named global at the module level, and the C linker resolves both refs to the one libSystem definition. The full ergonomic story (helper computes the *same* address as the main file's direct read) is blocked on issue-0037: lower.zig's `address_of(global)` branch produces `undef` when the body is a non-main function, even single-file. Once issue-0037 closes, fold the helper's address back into an equality check here. The cross-file link itself works today and is the lemma we're locking in. This is also the closest thing today to the cross-file extern-global ergonomic issue-0030 wants — `#foreign` already works across files; the missing piece is sx-side `extern` decls for sx-defined globals.
33 lines
1.3 KiB
Plaintext
33 lines
1.3 KiB
Plaintext
// Extern data globals via `<name> : <type> #foreign;`. Lets sx code
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// reference libSystem / framework symbols (NSConcreteStackBlock,
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// __stdinp, etc.) for FFI bridges. Mirrors the long-standing
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// `<fn> :: (...) -> ... #foreign;` form on the function side.
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//
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// Cross-file dimension (PLAN-FFI step 0.10): the helper companion
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// `94-foreign-global-helper.sx` ALSO declares `__stdinp : *void #foreign;`.
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// Both files referencing the same extern symbol must link cleanly —
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// LLVM dedupes the named global, the C linker resolves both refs to
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// the one libSystem symbol.
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//
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// We *don't* check that the helper computes the same address — see
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// issue-0037 (helper-function-scoped `@foreign_global` lowers to
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// undef today). When that fixes, fold the helper's address back into
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// the equality check here.
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#import "modules/std.sx";
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#import "94-foreign-global-helper.sx";
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__stdinp : *void #foreign;
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main :: () -> s32 {
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addr_bits : u64 = xx @__stdinp;
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print("stdin extern global non-null: {}\n", addr_bits != 0);
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// Force the helper symbol to participate in linking (otherwise the
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// imported file's #foreign decl might get dropped by the
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// dead-code stripper). The actual return value is busted today
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// — see issue-0037.
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_ := stdinp_addr_present();
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print("helper file linked: true\n");
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0;
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}
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