卜部昌平 eb92159d72 Revert https://github.com/ruby/ruby/pull/2486 ... This reverts commits: 10d6a3aca7 8ba48c1b85 fba8627dc1 dd883de5ba 6c6a25feca 167e6b48f1 7cb96d41a5 3207979278 595b3c4fdd 1521f7cf89 c11c5e69ac cf33608203 3632a812c0 f56506be0d 86427a3219 . The reason for the revert is that we observe ABA problem around inline method cache. When a cache misshits, we search for a method entry. And if the entry is identical to what was cached before, we reuse the cache. But the commits we are reverting here introduced situations where a method entry is freed, then the identical memory region is used for another method entry. An inline method cache cannot detect that ABA. Here is a code that reproduce such situation: ```ruby require 'prime' class << Integer alias org_sqrt sqrt def sqrt(n) raise end GC.stress = true Prime.each(7*37){} rescue nil # <- Here we populate CC class << Object.new; end # These adjacent remove-then-alias maneuver # frees a method entry, then immediately # reuses it for another. remove_method :sqrt alias sqrt org_sqrt end Prime.each(7*37).to_a # <- SEGV ```		2019-10-03 12:45:24 +09:00
..
lib	ext/coverage/lib/coverage.rb (Coverage.line_stub): use only line events	2018-12-20 10:17:37 +00:00
coverage.c	Revert https://github.com/ruby/ruby/pull/2486	2019-10-03 12:45:24 +09:00
depend	Split RUBY_ASSERT and so on under include/ruby	2019-07-14 17:45:21 +09:00
extconf.rb