ruby.git/test/-ext-/string/test_capacity.rb, branch v3_2_11

Decouple GC slot sizes from RVALUE

2022-02-02T14:52:04+00:00

Add a new macro BASE_SLOT_SIZE that determines the slot size.

For Variable Width Allocation (compiled with USE_RVARGC=1), all slot
sizes are powers-of-2 multiples of BASE_SLOT_SIZE.

For USE_RVARGC=0, BASE_SLOT_SIZE is set to sizeof(RVALUE).

Make embedded string length a long for VWA

2022-01-12T17:00:55+00:00

A short (2 bytes) will cause unaligned struct accesses when strings are
used as a buffer to directly store binary data.

[Feature #18239] Implement VWA for strings

2021-10-25T17:26:23+00:00

This commit adds support for embedded strings with variable capacity and
uses Variable Width Allocation to allocate strings.

Revert "[EXPERIMENTAL] Make Symbol#to_s return a frozen String [Feature #16150]"

2019-11-05T08:30:54+00:00

This reverts commit 6ffc045a817fbdf04a6945d3c260b55b0fa1fd1e.

[EXPERIMENTAL] Make Symbol#to_s return a frozen String

2019-09-26T08:23:02+00:00

* Always the same frozen String for a given Symbol.
* Avoids extra allocations whenever calling Symbol#to_s.
* See [Feature #16150]

Resize capacity for fstring

2019-06-26T06:01:48+00:00

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

Fixed misspelling words.

2017-10-22T11:27:06+00:00

  These are detected by https://github.com/client9/misspell

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60359 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

io.c: shrink read buffer

2017-08-31T08:21:46+00:00

* io.c (io_setstrbuf): return true if the buffer is newly created.

* io.c (io_set_read_length): shrink the read buffer if it is a new
  object and is too large.  [ruby-core:81370] [Bug #13597]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* string.c (rb_str_init): introduce String.new(capacity: size)

2016-02-17T03:21:35+00:00

  [Feature #12024]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53850 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* test/-ext-/string/test_capacity.rb: Added missing library.

2016-01-27T12:04:47+00:00

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53674 b2dd03c8-39d4-4d8f-98ff-823fe69b080e