DrSocalkwe3n/luajit
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No longer let the GC replace dead keys with the LJ_TDEADKEY tag.

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Important: this changes the semantics of the write barrier!
Carefully read the big comment block in lj_obj.h
This helps HREFK key slot specialization and allows safely hoisting
HREF/HREFK across GC steps, too (fix for a barely reproducible bug).
Dead keys are only removed during a table resize (as before).
This commit is contained in:
Mike Pall
2010-04-21 01:45:58 +02:00
parent d8cb69ed07
commit ab45481199
13 changed files with 65 additions and 43 deletions
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src/lj_meta.c
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@@ -134,7 +134,7 @@ TValue *lj_meta_tset(lua_State *L, cTValue *o, cTValue *k)
TValue *tv = lj_tab_set(L, t, k);
if (!tvisnil(tv) ||
!(mo = lj_meta_fast(L, tabref(t->metatable), MM_newindex))) {
if (isblack(obj2gco(t))) lj_gc_barrierback(G(L), t);
lj_gc_anybarriert(L, t);
return tv;
}
} else if (tvisnil(mo = lj_meta_lookup(L, o, MM_newindex))) {