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arena (25.3b): LOCAL sites allocate from the frame's scratch; dispatch is not an allocation; @frame by property

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Behind ludicc --arena (or 'arena on' in the program's package.ludic): the escape analysis runs and a
LOCAL site's allocation raises @lp_want for that one call, so it comes from the frame's arena. Two
halves in one mmap reservation (R3D_ARENA_MB each, 256 by default), bump-allocated with a 16-byte
size header, flipped at each frame mark: a frame's scratch is good through the next frame, then its
half is started again (R3D_ARENA_CHECK=1 fills it with 0xDD first). The heap takes over when no frame
is running, off the main thread, or past the half's end; lp_free ignores an arena block and
lp_realloc copies one out. R3D_ARENA=0 turns it off at run time; the census reports each half's
high-water mark. A program that builds text, a list and a record per frame: 29998 heap blocks made
and 18002 freed without it, 8 and 8 with it and 544 bytes of scratch a frame, the same output.

A dispatch's 'new' fills the queue's kept record (E_NEW.b), so 25.2 no longer counts it and 25.3
treats its fields as kept. '@frame' is keyed by property and field: a 'run' field is a root only in
a property that marks it, and 'tick' stays a System's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-28 16:25:32 +03:00
parent 8dfcccad41
commit bef0d6fbca
11 changed files with 80823 additions and 78428 deletions
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2
selfhost/frontend/parse_game.ludic
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@ -12,7 +12,7 @@ function parse_component() -> Node {
var is_frame = false # @frame — a fn stored here runs every frame (25.2)
if is_op("@") { pi += 1; let ann = eat_id(); if ann == "Computed" { is_computed = true } else if ann == "Sync" { is_sync = true } else if ann == "frame" { is_frame = true }; skipnl() }
let f = node(N_FIELD); f.s = eat_id(); eat_op(":"); f.ty = ptype()
if is_frame { push(g_frame_fields, f.s) }
if is_frame { push(g_frame_fields, `{n.s}.{f.s}`) }
if is_op("=") { pi += 1; f.a = expr() }
if is_sync { f.ival = 1 } # mark the field replicable (read by emit_net)
if is_computed { register_computed(n.s, f.s, f.ty, f.a) } # derived: no storage