d8076b9333
Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.
Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).
Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.
zig build test: 426/426; examples suite: 595/595.
38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
// Regression test for issue-0025 path B.
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//
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// When a fn-pointer's type is spelled with `callconv(.c)`, the indirect
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// call must apply the same C-ABI byval coercion that direct C-ABI calls
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// do at the call site (path A): >16-byte non-HFA aggregates are passed
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// as `ptr byval(<T>)`. Without the fix, the indirect call site builds
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// an LLVM function type whose param slot is the raw struct, which the
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// AArch64/x86_64 backend tries to lay out across registers + stack in
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// ways that don't match the byval-attributed callee signature — the
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// callee then reads garbage out of the wrong machine-state slots.
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//
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// The opt-in is the `callconv(.c)` on the fn-pointer type spelling.
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// Pure-sx fn-pointer casts (no callconv suffix) keep their default
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// calling convention — verified by examples/87-fnptr-cast-large-aggregate.sx.
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#import "modules/std.sx";
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Wide :: struct {
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a: i64;
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b: i64;
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c: i64;
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d: i64;
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}
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accept_c :: (w: Wide) -> i64 callconv(.c) {
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w.a + w.b + w.c + w.d
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}
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main :: () -> i32 {
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w := Wide.{ a = 1, b = 10, c = 100, d = 1000 };
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if accept_c(w) != 1111 { return 1; }
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fn_ptr : (Wide) -> i64 callconv(.c) = xx accept_c;
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if fn_ptr(w) != 1111 { return 2; }
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0
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}
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