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Clean up fixedobj_points_to_younger

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Douglas Katzman 2026-09-07 22:25:59 -04:00
parent 81b27ad777
commit d79b179ccb
1 changed files with 5 additions and 21 deletions
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26
src/runtime/immobile-space.c
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@ -801,22 +801,6 @@ younger_p(lispobj thing, int gen, int keep_gen, int new_gen)
return is_lisp_pointer(thing) && pointee_gen(thing, keep_gen, new_gen) < gen; return is_lisp_pointer(thing) && pointee_gen(thing, keep_gen, new_gen) < gen;
} }
// Scan range between start and end (exclusive) for old-to-young pointers.
static int
range_points_to_younger_p(lispobj* obj, lispobj* end,
int gen, int keep_gen, int new_gen)
{
#ifdef DEBUG
lispobj* __attribute__((unused)) saved_obj = obj, __attribute__((unused)) header = *obj;
#endif
do {
lispobj thing = *obj;
if (is_lisp_pointer(thing) && pointee_gen(thing, keep_gen, new_gen) < gen)
return 1; // yes, points to younger
} while (++obj < end);
return 0; // no, does not point to younger
}
// Scan a fixed-size object for old-to-young pointers. // Scan a fixed-size object for old-to-young pointers.
// Since fixed-size objects are boxed and on known boundaries, // Since fixed-size objects are boxed and on known boundaries,
// we never start in the middle of random bytes, so the answer is exact. // we never start in the middle of random bytes, so the answer is exact.
@ -848,18 +832,18 @@ fixedobj_points_to_younger_p(lispobj* obj, int n_words,
return 1; return 1;
struct bitmap bitmap = get_layout_bitmap(LAYOUT(layout)); struct bitmap bitmap = get_layout_bitmap(LAYOUT(layout));
gc_assert(bitmap.nwords == 1); gc_assert(bitmap.nwords == 1);
if (bitmap.bits[0] != (sword_t)-1) { // the bitmap of a LAYOUT is never the default (all-tagged) bitmap
gc_assert(bitmap.bits[0] != (sword_t)-1);
{
sword_t mask = bitmap.bits[0]; sword_t mask = bitmap.bits[0];
lispobj* where = obj + 1; lispobj* where = obj + 1;
lispobj* limit = obj + n_words; lispobj* limit = obj + n_words;
for ( ; where < limit ; ++where, mask >>= 1 ) for ( ; where < limit ; ++where, mask >>= 1 )
if ((mask & 1) != 0 && younger_p(*where, gen, keep_gen, new_gen)) if ((mask & 1) != 0 && younger_p(*where, gen, keep_gen, new_gen)) return 1;
return 1;
return 0; return 0;
} }
// FALLTHROUGH_INTENDED
} }
return range_points_to_younger_p(obj+1, obj+n_words, gen, keep_gen, new_gen); lose("Unhandled widetag in fixedobj_points_to_younger");
} }
/// The next two functions are analogous to 'update_page_write_prot()' /// The next two functions are analogous to 'update_page_write_prot()'