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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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7
selfhost/backend/emit_escape.ludic
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@ -104,6 +104,13 @@ function es_val(e: Node) -> int {
return -1
}
if k == E_UN { es_val(e.a); return -1 }
if k == E_NEW and e.b != null { # a dispatch fills the queue's kept record: kept
if e.a != null and e.a.kids != null {
var i = 0
while i < len(e.a.kids) { es_escape(es_val(e.a.kids[i].a)); i += 1 }
}
return g_es_heap
}
if k == E_NEW {
let s = es_site(e)
if e.a != null and e.a.kids != null {