When use non-frozen string for hash key with `rb_hash_aset()`, it will duplicate and freeze it internally.
To avoid duplicate and freeze, this patch will give a frozen string in `rb_hash_aset()`.
```
Warming up --------------------------------------
json 14.000 i/100ms
Calculating -------------------------------------
json 148.844 (± 1.3%) i/s - 756.000 in 5.079969s
```
```
Warming up --------------------------------------
json 16.000 i/100ms
Calculating -------------------------------------
json 165.608 (± 1.8%) i/s - 832.000 in 5.025367s
```
```
require 'json'
require 'securerandom'
require 'benchmark/ips'
obj = []
1000.times do |i|
obj << {
"id": i,
"uuid": SecureRandom.uuid,
"created_at": Time.now
}
end
json = obj.to_json
Benchmark.ips do |x|
x.report "json" do |iter|
count = 0
while count < iter
JSON.parse(json)
count += 1
end
end
end
```
https://github.com/flori/json/commit/18292c0c1d
Ragel generates a code `0 <= (*p)` where `*p` is char.
As char is unsigned by default on arm and RISC-V, it is warned by gcc:
```
compiling parser.c
parser.c: In function ‘JSON_parse_string’:
parser.c:1566:2: warning: comparison is always true due to limited range of data type [-Wtype-limits]
if ( 0 <= (*p) && (*p) <= 31 )
^
parser.c:1596:2: warning: comparison is always true due to limited range of data type [-Wtype-limits]
if ( 0 <= (*p) && (*p) <= 31 )
^
```
This change removes the warning by substituting the condition with
`0 <= (signed char)(*p)`.
In where to convert Hash key to String for json, this patch will add shortcut for String/Symbol in Hash key.
```
$ ruby bench_json_generate.rb
Warming up --------------------------------------
json 65.000 i/100ms
Calculating -------------------------------------
json 659.576 (± 1.5%) i/s - 3.315k in 5.027127s
```
```
$ ruby bench_json_generate.rb
Warming up --------------------------------------
json 78.000 i/100ms
Calculating -------------------------------------
json 789.781 (± 2.7%) i/s - 3.978k in 5.041043s
```
```
require 'json'
require 'benchmark/ips'
obj = []
1000.times do |i|
obj << {
"id" => i,
:age => 42,
}
end
Benchmark.ips do |x|
x.report "json" do |iter|
count = 0
while count < iter
JSON.generate(obj)
count += 1
end
end
end
```
https://github.com/flori/json/commit/38c0f6dbe4
To convert Hash convert, this part was using following pseudo code
```
obj.keys.each do |key|
value = obj[key]
...
end
```
and `rb_funcall()` was called for `obj.keys`.
It might be slightly heavy to call the Ruby method.
This patch will iterate to convert Hash object about key/value using `rb_hash_foreach()` Ruby API instead of `rb_funcall()`.
```
$ ruby bench_json_generate.rb
Warming up --------------------------------------
json 55.000 i/100ms
Calculating -------------------------------------
json 558.501 (± 1.1%) i/s - 2.805k in 5.022986s
```
```
$ ruby bench_json_generate.rb
Warming up --------------------------------------
json 65.000 i/100ms
Calculating -------------------------------------
json 659.576 (± 1.5%) i/s - 3.315k in 5.027127s
```
```
require 'json'
require 'benchmark/ips'
obj = []
1000.times do |i|
obj << {
"id" => i,
:age => 42,
}
end
Benchmark.ips do |x|
x.report "json" do |iter|
count = 0
while count < iter
JSON.generate(obj)
count += 1
end
end
end
```
https://github.com/flori/json/commit/a73323dc5e
`rb_funcall` might be slightly heavy to call the Ruby method.
This patch will convert String encoding using `rb_str_encode()` instead of `rb_funcall()`.
## Before
```
$ ruby bench_json_generate.rb
Warming up --------------------------------------
json 78.000 i/100ms
Calculating -------------------------------------
json 789.781 (± 2.7%) i/s - 3.978k in 5.041043s
```
## After
```
$ ruby bench_json_generate.rb
Warming up --------------------------------------
json 129.000 i/100ms
Calculating -------------------------------------
json 1.300k (± 2.3%) i/s - 6.579k in 5.064656s
```
## Code
```
require 'json'
require 'benchmark/ips'
obj = []
1000.times do |i|
obj << {
"id" => i,
:age => 42,
}
end
Benchmark.ips do |x|
x.report "json" do |iter|
count = 0
while count < iter
JSON.generate(obj)
count += 1
end
end
end
```
https://github.com/flori/json/commit/9ae6d2969c
Hiroshi SHIBATA
Jean Boussier
BurdetteLamar
Julien Feltesse
Karol Bucek
Keith Bennett
卜部昌平
Marc-Andre Lafortune
Watson
Nobuyoshi Nakada
noraj
Yusuke Endoh
zverok
Jeremy Evans
Aaron Patterson
Sho Hashimoto