John Hawthorn 04bc4c0662 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

2019-06-26 15:01:48 +09:00

..

test_capacity.rb

Resize capacity for fstring

2019-06-26 15:01:48 +09:00

test_coderange.rb

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test_cstr.rb

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test_ellipsize.rb

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test_enc_associate.rb

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test_enc_str_buf_cat.rb

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test_external_new.rb

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test_fstring.rb

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test_modify_expand.rb

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test_nofree.rb

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test_normalize.rb

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test_qsort.rb

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test_rb_str_dup.rb

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test_set_len.rb

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