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Make OBJ_ID_INCREMENT == RUBY_IMMEDIATE_MASK + 1

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All the non-GC objects (i.e. immediates) have addresses such that
`obj % RUBY_IMMEDIATE_MASK != 0` (except for `Qfalse`, which is 0). We
can define `OBJ_ID_INCREMENT` as `RUBY_IMMEDIATE_MASK + 1` which should
guarantee that GC objects never have conflicting object IDs with
immediates.
This commit is contained in:
Peter Zhu 2024-07-16 15:38:48 -04:00
parent 690ea013ca
commit 403f44ec2c
Notes: git 2024-07-17 13:01:59 +00:00 
Merged: https://github.com/ruby/ruby/pull/11178
1 changed files with 1 additions and 1 deletions
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gc/default.c
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@ -1629,7 +1629,7 @@ object_id_hash(st_data_t n)
return FIX2LONG(rb_hash((VALUE)n));
}
#define OBJ_ID_INCREMENT (BASE_SLOT_SIZE)
#define OBJ_ID_INCREMENT (RUBY_IMMEDIATE_MASK + 1)
#define OBJ_ID_INITIAL (OBJ_ID_INCREMENT)
static const struct st_hash_type object_id_hash_type = {