cd5b958d19
Introduce the welded comptime `compiler` library (`#library "compiler"` +
`abi(.zig) extern compiler`), per design/comptime-compiler-api.md, and unify
`callconv(...)` into the new `abi(...)` annotation.
abi(...) replaces callconv(...):
- New ABI enum { default, c, zig, pure }; `abi(.c|.zig|.pure)` parses in the
postfix slot before extern/export (and standalone). `kw_callconv` -> `kw_abi`.
- Migrated 52 sx files, the call-convention-mismatch diagnostic, and docs
(readme/specs) from `callconv(.c)` to `abi(.c)`.
Phase 1 — welded compiler library (parse -> registry -> validation -> bridge):
- `abi(.zig) extern compiler` parses on fn decls (carries abi/extern_lib) and
struct decls (StructDecl.abi/extern_lib).
- `#library "compiler"` is the comptime-only internal surface — never dlopen'd.
- src/ir/compiler_lib.zig: the binding registry (the safety boundary). `Field`
welded to StructInfo.Field with layout baked from the real Zig type
(@offsetOf/@sizeOf); `findType`/`findFn`. Welded structs are layout-validated
at registration (field set + total size) as a header checked against the impl.
- Host-call bridge: a `fn abi(.zig) extern compiler` dispatches under the
comptime interp to its registered Zig handler (intern/text_of round-trip),
never dlsym. IR Function.compiler_welded; validated in declareFunction.
- Comptime-only enforcement: a runtime call to a welded fn is a clean
build-gating error (emitCall), not an undefined-symbol link failure.
Phase 2.1 — byte-layout weld foundation:
- Decision: full byte-layout weld (sx struct laid out byte-identically to the
bound Zig type). Registered StructInfo (first non-natural / Zig-reordered
layout). `computeWeldPlan` — pure offset-ordered element plan + padding +
sx-field->LLVM-element remap; unit-tested. Emit/interp wiring is the next
sub-step (2.2+, see current/CHECKPOINT-COMPILER-API.md).
Examples: 0625/0626 (welded struct + fn round-trip), 1183/1184/1185
(layout-mismatch, unexported-fn, runtime-call diagnostics).
30 lines
823 B
Plaintext
30 lines
823 B
Plaintext
// Pure-sx fn-pointer cast: a function-pointer typed without `abi(.c)`
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// keeps the default (sx) calling convention. Passing a >16-byte aggregate
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// through that pointer must not get the C-ABI byval coercion — the sx-CC
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// callee expects the struct as an SSA value, not as a `ptr byval(<T>)`.
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//
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// Pair with examples/86-abi-c-fnptr-large-aggregate.sx, which covers
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// the opposite arm (fn-pointer typed `abi(.c)` does get byval).
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#import "modules/std.sx";
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Wide :: struct {
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a: i64; b: i64; c: i64; d: i64;
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}
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accept :: (w: Wide) -> i64 {
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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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direct := accept(w);
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if direct != 1111 { return 1; }
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fn_ptr : (Wide) -> i64 = xx accept;
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indirect := fn_ptr(w);
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if indirect != 1111 { return 2; }
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0
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}
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