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Free bit 7 of GC 'marked' field

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Tables were using this bit to indicate their array sizes were real
('isrealasize'), but this bit can be useful for tests. Instead, they
can use bit 7 of their 'flag' field for that purpose. (There are only
six fast-access metamethods.) This 'flag' field only exists in tables,
so this use does not affect other types.
This commit is contained in:
Roberto Ierusalimschy
2020-08-07 11:21:44 -03:00
parent 68109afcdb
commit 7c3cb71fa4
6 changed files with 31 additions and 7 deletions
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3
lgc.h
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@@ -69,8 +69,7 @@
/*
** Layout for bit use in 'marked' field. First three bits are
** used for object "age" in generational mode. Last bit is free
** to be used by respective objects.
** used for object "age" in generational mode.
*/
#define WHITE0BIT 3 /* object is white (type 0) */
#define WHITE1BIT 4 /* object is white (type 1) */