agra
8b457ffc44
ffi M5.A.next.3b: type_eq + has_impl comptime intrinsics
...
Step 3 second slice. Adds two reflection builtins used by
pack-fn bodies to branch on type identity / protocol
membership at compile time. type_name already existed
(lower.zig:8693); reused as-is.
type_eq(T1, T2) -> bool structural TypeId equality
has_impl(P, T) -> bool T has a reachable impl for P
Both are wired through `tryConstBoolCondition` so the inline-if
ladder folds them at lower time — `inline if type_eq(...)` /
`inline if has_impl(...)` collapse to a single branch with no
runtime instructions, perfect for guard-based dispatch inside
pack-fn bodies.
`has_impl`'s protocol arg accepts two shapes:
- plain protocol name: `has_impl(Allocator, CAllocator)` →
walks `protocol_thunk_map["Allocator\x00CAllocator"]`.
- parameterised call: `has_impl(Into(Block), s64)` →
builds the param_impl_map key `"Into\x00Block\x00s64"`
and checks containment. The protocol type-args resolve
through `resolveTypeArg` so type aliases, generics, and
pack-indexed types all work as protocol args.
`computeHasImpl` is the shared implementation between the
runtime builtin path and the `tryConstBoolCondition` fast
path so both branches stay in sync.
`examples/168-pack-reflection-intrinsics.sx` exercises every
shape:
- type_name for primitive types.
- type_eq with both equal + unequal cases, including pointer
types (s64 vs *s64).
- inline-if folding type_eq.
- has_impl with a real plain-protocol impl
(Allocator/CAllocator → true; Allocator/s64 → false).
- has_impl with a user-defined parameterised protocol
(Wrap(s64)/s32 → true; mismatched target args → false).
208/208 example tests + `zig build test` green.
Caveat: plain-protocol has_impl uses `protocol_thunk_map`
which is lazily populated when an `xx` cast or protocol
dispatch creates the thunks. For a static check before any
dispatch, that could false-negative. Allocator/CAllocator
works in 168 because stdlib's startup uses CAllocator through
the Allocator protocol — the thunks already exist by the time
has_impl runs. A more robust static check (walk fn_ast_map for
"<T_name>.<method>" entries against the protocol's method
list) is deferred to a follow-up if needed.
LSP "undefined variable" warnings on type names in expression
position (s64, *s64, Wrap(s64), etc. passed to type_eq /
has_impl) are cosmetic — sema doesn't know these intrinsics
accept types as args. Tracked separately.
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