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Phase 4: Eliminate nested CEK from HO form handlers

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Higher-order forms (map, filter, reduce, some, every?, for-each,
map-indexed) now evaluate their arguments via CEK frames instead
of nested trampoline(eval-expr(...)) calls.

Added HoSetupFrame — staged evaluation of HO form arguments.
When all args are evaluated, ho-setup-dispatch sets up the
iteration frame. This keeps a single linear CEK continuation
chain instead of spawning nested CEK instances.

14 nested eval-expr calls eliminated (39 → 25 remaining).
The remaining 25 are in delegate functions (sf-letrec, sf-scope,
parse-keyword-args, qq-expand, etc.) called infrequently.

All tests unchanged: JS 747/747, Full 864/870, Python 679/679.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-03-15 14:10:33 +00:00
parent e475222099
commit c6a662c980
5 changed files with 603 additions and 81 deletions
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6
sx/sx/nav-data.sx
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@@ -246,7 +246,11 @@
(dict :label "Reactive Runtime" :href "/sx/(etc.(plan.reactive-runtime))"
:summary "Seven feature layers — ref, foreign FFI, state machines, commands with undo/redo, render loops, keyed lists, client-first app shell. Zero new platform primitives.")
(dict :label "Rust/WASM Host" :href "/sx/(etc.(plan.rust-wasm-host))"
:summary "Bootstrap the SX spec to Rust, compile to WASM, replace sx-browser.js. Shared platform layer for DOM, phased rollout from parse to full parity.")))
:summary "Bootstrap the SX spec to Rust, compile to WASM, replace sx-browser.js. Shared platform layer for DOM, phased rollout from parse to full parity.")
(dict :label "Isolated Evaluator" :href "/sx/(etc.(plan.isolated-evaluator))"
:summary "Core/application split, shared sx-platform.js, isolated JS evaluator, Rust WASM via handle table. Only language-defining spec gets bootstrapped; everything else is runtime-evaluated .sx.")
(dict :label "Mother Language" :href "/sx/(etc.(plan.mother-language))"
:summary "SX as its own compiler. OCaml as substrate (closest to CEK), Koka as alternative (compile-time linearity), ultimately self-hosting. One language, every target.")))
(define reactive-islands-nav-items (list
(dict :label "Overview" :href "/sx/(geography.(reactive))"