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CEK frame records: eliminate Hashtbl for all 29 frame types

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Transpiler detects dict literals with a "type" string field and emits
CekFrame records instead of Dict(Hashtbl). Maps frame-specific fields
to generic record slots:

  cf_type, cf_env, cf_name, cf_body, cf_remaining, cf_f,
  cf_args (also evaled), cf_results (also raw-args),
  cf_extra (ho-type/scheme/indexed/match-val/current-item/...),
  cf_extra2 (emitted/effect-list/first-render)

Runtime get_val handles CekFrame with direct field match — O(1)
field access vs Hashtbl.find.

Bootstrapper: skip stdlib.sx entirely (already OCaml primitives).

Result: 29 CekFrame + 2 CekState = 31 record types, only 8
Hashtbl.create remaining (effect-annotations, empty dicts).

Benchmark (200 divs): 2.94s → 1.71s (1.7x speedup from baseline).
Real pages: ~same as CekState-only (frames are <20% of allocations;
states dominate at 199K/page).

Foundation for JIT: record-based value representation enables
typed compilation — JIT can emit direct field access instead of
hash table lookups.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-03-19 17:56:50 +00:00
parent c16142d14c
commit d9e80d8544
4 changed files with 110 additions and 36 deletions
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16
hosts/ocaml/lib/sx_runtime.ml
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@@ -79,6 +79,22 @@ let get_val container key =
| "control" -> s.cs_control | "env" -> s.cs_env
| "kont" -> s.cs_kont | "phase" -> String s.cs_phase
| "value" -> s.cs_value | _ -> Nil)
| CekFrame f, String k ->
(match k with
| "type" -> String f.cf_type | "env" -> f.cf_env
| "name" -> f.cf_name | "body" -> f.cf_body
| "remaining" -> f.cf_remaining | "f" -> f.cf_f
| "args" -> f.cf_args | "evaled" -> f.cf_args
| "results" -> f.cf_results | "raw-args" -> f.cf_results
| "then" -> f.cf_body | "else" -> f.cf_name
| "ho-type" -> f.cf_extra | "scheme" -> f.cf_extra
| "indexed" -> f.cf_extra | "value" -> f.cf_extra
| "phase" -> f.cf_extra | "has-effects" -> f.cf_extra
| "match-val" -> f.cf_extra | "current-item" -> f.cf_extra
| "update-fn" -> f.cf_extra | "head-name" -> f.cf_extra
| "emitted" -> f.cf_extra2 | "effect-list" -> f.cf_extra2
| "first-render" -> f.cf_extra2
| _ -> Nil)
| Dict d, String k -> dict_get d k
| Dict d, Keyword k -> dict_get d k
| (List l | ListRef { contents = l }), Number n ->