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).
38 lines
1.4 KiB
Plaintext
38 lines
1.4 KiB
Plaintext
// FFI plan step 5.2 — generic `Into(Block) for Closure(..$args) ->
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// $R` impl. One impl in stdlib covers every closure shape; the
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// compiler monomorphises the impl body per call shape and emits a
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// dedicated `__invoke` `abi(.c)` trampoline + Block literal
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// (via `#insert build_block_convert($args, $R);`).
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//
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// This test exercises a closure shape (`Closure(i64, i64) -> void`)
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// that has NO hand-rolled `Into(Block)` impl in
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// `library/modules/ffi/objc_block.sx`. Before step 5.2 lands,
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// `xx cl : Block` errors out with the "no Into(Block) for
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// cl_i64_i64__void" focused diagnostic. After the generic impl
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// lands, the same call resolves through the pack-shaped impl and
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// the per-shape trampoline ferries control back to the sx closure.
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//
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// The block is invoked directly through `b.invoke` (a typed
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// `abi(.c)` fn-pointer) — the same shape the Apple Block
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// runtime calls when a UIKit/Foundation API hands the block back
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// to its registered invoke.
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#import "modules/std.sx";
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#import "modules/ffi/objc_block.sx";
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g_a: i64 = 0;
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g_b: i64 = 0;
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main :: () -> i32 {
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cl := (a: i64, b: i64) => { g_a = a; g_b = b; };
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blk : Block = xx cl;
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invoke_fn : (*Block, i64, i64) -> void abi(.c) = xx blk.invoke;
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invoke_fn(@blk, 10, 20);
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if g_a != 10 { print("FAIL: g_a={}\n", g_a); return 1; }
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if g_b != 20 { print("FAIL: g_b={}\n", g_b); return 1; }
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print("generic-into-block ok: a={} b={}\n", g_a, g_b);
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0
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}
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