Resize capacity for fstring
When a string is #frozen, it's capacity is resized to fit (if it is much larger), since we know it will no longer be mutated.
> puts ObjectSpace.dump(String.new("a"*30, capacity: 1000)) {"type":"STRING", "class":"0x7feaf00b7bf0", "bytesize":30, "capacity":1000, "value":"... > puts ObjectSpace.dump(String.new("a"*30, capacity: 1000).freeze) {"type":"STRING", "class":"0x7feaf00b7bf0", "frozen":true, "bytesize":30, "value":"...
(ObjectSpace.dump doesn't show capacity if capacity is equal to bytesize)
Previously, if we dedup into an fstring, using String#-@, capacity would not be reduced.
> puts ObjectSpace.dump(-String.new("a"*30, capacity: 1000)) {"type":"STRING", "class":"0x7feaf00b7bf0", "frozen":true, "fstring":true, "bytesize":30, "capacity":1000, "value":"...
This commit makes rb_fstring call rb_str_resize, the same as rb_str_freeze does.
Closes: https://github.com/ruby/ruby/pull/2256
Added by jhawthorn (John Hawthorn) almost 5 years ago
Resize capacity for fstring
When a string is #frozen, it's capacity is resized to fit (if it is much
larger), since we know it will no longer be mutated.
(ObjectSpace.dump doesn't show capacity if capacity is equal to bytesize)
Previously, if we dedup into an fstring, using String#-@, capacity would
not be reduced.
This commit makes rb_fstring call rb_str_resize, the same as
rb_str_freeze does.
Closes: https://github.com/ruby/ruby/pull/2256