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correct GC problem with mark mode

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The problem especially affects `enable-object-counts`, where mark mode
can update an old rtd instead of a copy that is already made.

original commit: 31e2df63894d39b005c6b9984745b44409198d02
This commit is contained in:
Matthew Flatt 2020-05-31 17:09:07 -06:00
parent 7768b09118
commit 58282cbb5f
1 changed files with 3 additions and 3 deletions
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6
s/mkgc.ss
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@ -78,9 +78,9 @@
;; inferred for `space-data`
;; * counting-root : check a counting root before pushing to sweep stack
;; - (trace <field>) : relocate for sweep, copy for copy, recur otherwise
;; - (trace-early <field>) : relocate for sweep or copy, recur otherwise
;; - (trace-early <field>) : relocate for sweep, copy, and mark; recur otherwise
;; - (trace-now <field>) : direct recur
;; - (trace-early-rtd <field>) : for record types, avoid recur on #!base-rtd
;; - (trace-early-rtd <field>) : for record types, avoids recur on #!base-rtd
;; - (trace-ptrs <field> <count>) : trace an array of pointerrs
;; - (copy <field>) : copy for copy, ignore otherwise
;; - (copy-bytes <field> <count>) : copy an array of bytes
@ -1508,7 +1508,7 @@
(code (case (and (not (lookup 'as-dirty? config #f))
(not (lookup 'rtd-relocated? config #f))
(lookup 'mode config))
[(copy sweep)
[(copy sweep mark)
(code
"/* Relocate to make sure we aren't using an oldspace descriptor"
" that has been overwritten by a forwarding marker, but don't loop"