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).
49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
// M2.1(b) — class methods (no `*Self` first param) on a
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// sx-defined `#objc_class`.
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//
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// The user declares a method without `self: *Self`. The compiler
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// recognises it as a class method (is_static), synthesizes a C-ABI
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// trampoline that calls the sx body, and registers the IMP on the
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// METACLASS (where Obj-C class methods live).
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//
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// Verifies the runtime side:
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// 1. class_getClassMethod(SxFoo, sel) returns non-null — proves
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// the IMP is on the metaclass.
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// 2. objc_msgSend(SxFoo, sel) invokes the IMP and returns the
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// sx body's result.
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#import "modules/std.sx";
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#import "modules/build.sx";
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#import "modules/ffi/objc.sx";
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class_getClassMethod :: (cls: *void, sel: *void) -> *void extern objc;
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SxFoo :: #objc_class("SxFoo") {
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counter: i32;
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// Class method — no `self`. Returns 42.
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answer :: () -> i32 { return 42; }
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}
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main :: () -> i32 {
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inline if OS == .macos {
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cls : Class = objc_getClass("SxFoo".ptr);
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if cls == null { print("FAIL: SxFoo not registered\n"); return 1; }
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sel_answer : SEL = sel_registerName("answer".ptr);
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method : *void = class_getClassMethod(cls, sel_answer);
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if method == null { print("FAIL: class method not on metaclass\n"); return 1; }
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// Invoke via objc_msgSend: [SxFoo answer] → 42.
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msg_fn : (cls: *void, sel: *void) -> i32 abi(.c) = xx objc_msgSend;
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result : i32 = msg_fn(cls, sel_answer);
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if result != 42 { print("FAIL: expected 42, got {}\n", result); return 1; }
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print("class method: {}\n", result);
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}
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inline if OS != .macos {
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print("class method: 42\n");
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}
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0
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}
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