mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
04bc4c0662
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
59 lines
1.5 KiB
Ruby
59 lines
1.5 KiB
Ruby
# frozen_string_literal: true
|
|
require 'test/unit'
|
|
require '-test-/string'
|
|
require 'rbconfig/sizeof'
|
|
|
|
class Test_StringCapacity < Test::Unit::TestCase
|
|
def capa(str)
|
|
Bug::String.capacity(str)
|
|
end
|
|
|
|
def test_capacity_embedded
|
|
size = RbConfig::SIZEOF['void*'] * 3 - 1
|
|
assert_equal size, capa('foo')
|
|
end
|
|
|
|
def test_capacity_shared
|
|
assert_equal 0, capa(:abcdefghijklmnopqrstuvwxyz.to_s)
|
|
end
|
|
|
|
def test_capacity_normal
|
|
assert_equal 128, capa('1'*128)
|
|
end
|
|
|
|
def test_s_new_capacity
|
|
assert_equal("", String.new(capacity: 1000))
|
|
assert_equal(String, String.new(capacity: 1000).class)
|
|
assert_equal(10000, capa(String.new(capacity: 10000)))
|
|
|
|
assert_equal("", String.new(capacity: -1000))
|
|
assert_equal(capa(String.new(capacity: -10000)), capa(String.new(capacity: -1000)))
|
|
end
|
|
|
|
def test_io_read
|
|
s = String.new(capacity: 1000)
|
|
open(__FILE__) {|f|f.read(1024*1024, s)}
|
|
assert_equal(1024*1024, capa(s))
|
|
open(__FILE__) {|f|s = f.read(1024*1024)}
|
|
assert_operator(capa(s), :<=, s.bytesize+4096)
|
|
end
|
|
|
|
def test_literal_capacity
|
|
s = "I am testing string literal capacity"
|
|
assert_equal(s.length, capa(s))
|
|
end
|
|
|
|
def test_capacity_frozen
|
|
s = String.new("I am testing", capacity: 1000)
|
|
s << "fstring capacity"
|
|
s.freeze
|
|
assert_equal(s.length, capa(s))
|
|
end
|
|
|
|
def test_capacity_fstring
|
|
s = String.new("I am testing", capacity: 1000)
|
|
s << "fstring capacity"
|
|
s = -s
|
|
assert_equal(s.length, capa(s))
|
|
end
|
|
end
|