Fixes space leak by switching to objects

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The integer-arena approach (parallel global arrays) never freed nodes,
causing 6GB+ memory usage when running the self-hosted kernel. PHP
arrays don't shrink and we have no GC for them.

- Replace int-arena with plain Node objects so PHP's refcounting GC
  reclaims unreachable subtrees automatically.
- Hash-cons Stem/Fork nodes to collapse duplicate immutable subtrees.
- Cache ofNumber(0..255) to avoid re-creating byte trees.
- Eliminate indirection (tag 4) nodes entirely; projection rules now
  eagerly reduce and copy tag/a/b into the original App node.
- Remove all deref() loops — every node is exactly what it says.

Memory: 6GB+ → 24MB for `id "hello"` with runArboricxToString kernel

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This commit is contained in:

James Eversole

2026-05-10 16:56:00 -05:00

parent 1885c9b4ba

commit 8a673e282d

5 changed files with 209 additions and 133 deletions

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