Matt Valentine-House d426343418 Store object age in a bitmap ... Closes [Feature #19729] Previously 2 bits of the flags on each RVALUE are reserved to store the number of GC cycles that each object has survived. This commit introduces a new bit array on the heap page, called age_bits, to store that information instead. This patch still reserves one of the age bits in the flags (the old FL_PROMOTED0 bit, now renamed FL_PROMOTED). This is set to 0 for young objects and 1 for old objects, and is used as a performance optimisation for the write barrier. Fetching the age_bits from the heap page and doing the required math to calculate if the object was old or not would slow down the write barrier. So we keep this bit synced in the flags for fast access.		2023-07-13 09:21:36 +01:00
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ruby	Store object age in a bitmap	2023-07-13 09:21:36 +01:00
ruby.h	include/ruby.h: skip doxygen	2021-09-10 20:00:06 +09:00