agra
fd03b5812f
ffi M5.A.next.4.3: $args[$i] in expression position — source construction
...
Final slice of the .type_tag activation. Sx code can now
construct Type values through the `$<pack>[<int_literal>]`
syntax in expression position. Lowering emits the new
`const_type(TypeId)` opcode; the interp materialises
`Value.type_tag(TypeId)`; reflection intrinsics + cmp_eq
read it kind-honestly.
Plumbing:
- src/parser.zig: `parsePrimary` accepts `$<ident>[<int_literal>]`
at the front of every expression. Emits a `pack_index_type_expr`
AST node — same node already used in TYPE positions in step 3,
now extended to expression positions.
- src/ir/lower.zig: two places teach the new node.
- `lowerExpr` arm: looks up `pack_arg_types[name][index]`, emits
`builder.constType(arg_tys[index])`. OOB / no-binding paths
emit a focused diagnostic + a `constType(.void)` placeholder
(loud failure preserves silent-error budget).
- `resolveTypeArg` arm: the same lookup, but returns the
TypeId directly. Used by the lower-time fast paths in
`tryLowerReflectionCall` + `tryConstBoolCondition` so
`type_name($args[0])`, `type_eq($args[0], s64)`, and
`has_impl(...)` all see the bound TypeId rather than
falling through to the `.s64` default that the silent-arm
rule forbids.
The two arms ensure both runtime AND compile-time paths use
the same source-of-truth (`pack_arg_types`), so per-mono
dispatch via `inline if type_eq($args[0], s64) { ... }` folds
at compile time as expected.
`examples/169-pack-value-dispatch.sx` exercises both shapes:
- `type_name($args[0])` returns the per-mono concrete type
name ("s64", "string", "f64").
- `inline if type_eq($args[0], s64) { ... }` ladder dispatches
per-mono ("got s64", "got string", "got bool", "got other").
209/209 example tests + `zig build test` green.
What's now possible end-to-end:
show :: (..$args) -> string => type_name($args[0]);
show(42) // "s64"
show("hi") // "string"
describe :: (..$args) -> string {
inline if type_eq($args[0], s64) { return "got s64"; }
...
}
The "by the book" activation is complete:
- foundation (const_type opcode, interp variant, helpers) — 4.0
- interp reflection arms (type_name / type_eq / has_impl) — 4.1
- box_any/display audit + bitcast guard — 4.2
- source-language construction via $args[$i] — 4.3
Step 5 (generic Into(Block) impl in stdlib) is now fully
unblocked — its trampoline body can interpolate per-mono types
both in type positions AND in expression positions.
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..
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