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reachability scan (25.5b) and exit accounting; free() and print release what they are handed

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Mem.scan() and R3D_ALLOC_SCAN=<frame> (at that frame's mark, when no function is running) walk
every heap block reachable from the program's globals - the states among them - conservatively: each
word that is a heap block's start (malloc_size says so) is followed, blocks made before tracking too.
A tracked block nothing reaches is a leak whatever a frame's totals say; they are summed by site and
printed ('alloc-scan: frame 39 - 32 bytes in 2 blocks ... reachable from no global or state', then
the sites). R3D_ALLOC_EXIT=1 runs the same scan as the program quits. A test: two records dropped in
frame 20 are the two found, the one pushed into a state is not.

The escape analysis now takes free(x) as giving x back (ES_FREED, flowing to what reached x) and a
print's argument as used up, so ludic deps --births lists only what is never given back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-28 16:48:35 +03:00
parent 3205408290
commit 39af9cabc0
7 changed files with 74517 additions and 71904 deletions
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selfhost/backend/emit_frame.ludic
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@ -246,7 +246,7 @@ function deps_births(f: pointer, seen: []bool) -> void {
let c = g_es_site_cls[s]
let fi = g_es_site_fn[s]
let site = g_es_site[s]
if c >= 0 and fi >= 0 and (g_es_flag[c] & ES_ESC) == 0 and not g_es_site_aok[s] and not g_es_site_grow[s] {
if c >= 0 and fi >= 0 and (g_es_flag[c] & (ES_ESC | ES_FREED)) == 0 and not g_es_site_aok[s] and not g_es_site_grow[s] {
let d = g_es_fnode[fi]
let k = dr_index(d.s)
let inframe = k >= 0 and seen[k]