If the provided Hash doesn't have a default proc, we know for
sure that we'll never call into user provided code, hence the
string we allocate to access the Hash can't possibly escape.
So we don't actually have to allocate it, we can use a fake_str,
AKA a stack allocated string.
```
compare-ruby: ruby 3.5.0dev (2025-02-10T13:47:44Z master 3fb455adab) +PRISM [arm64-darwin23]
built-ruby: ruby 3.5.0dev (2025-02-10T17:09:52Z opt-gsub-alloc ea5c28958f) +PRISM [arm64-darwin23]
warming up....
| |compare-ruby|built-ruby|
|:----------------|-----------:|---------:|
|escape | 3.374k| 3.722k|
| | -| 1.10x|
|escape_bin | 5.469k| 6.587k|
| | -| 1.20x|
|escape_utf8 | 3.465k| 3.734k|
| | -| 1.08x|
|escape_utf8_bin | 5.752k| 7.283k|
| | -| 1.27x|
```
The inspect format was intentionally changed as an outcome of
[Bug #20433] [ruby-core:118668], but some documentation update
was missing, as [Bug #20962] pointed out. Update some output
examples that clearly use Hash#inspect.
If a Hash which is empty or only using literals is frozen, we detect
this as a peephole optimization and change the instructions to be
`opt_hash_freeze`.
[Feature #20684]
Co-authored-by: Jean Boussier <byroot@ruby-lang.org>
28a1c4f33e seems to call an improper
ensure clause. [Bug #20655]
Than fixing it properly, I bet it would be much better to simply revert
that commit. It reduces the unneeded complexity. Jumping into a block
called by a C function like Hash#each with callcc is user's fault.
It does not need serious support.
The macro SafeStringValue() became just StringValue() in c5c05460ac,
and it is deprecated nowadays.
This patch replaces remaining macro usage. Some occurrences are left in
ext/stringio and ext/win32ole, they should be fixed upstream.
The macro itself is not deleted, because it may be used in extensions.
[Bug #20145]
Before this commit, both copy_compare_by_id and hash_copy will create a
copy of the ST table, so the ST table created in copy_compare_by_id will
be leaked.
h = { 1 => 2 }.compare_by_identity
10.times do
1_000_000.times do
h.select { false }
end
puts `ps -o rss= -p #{$$}`
end
Before:
110736
204352
300272
395520
460704
476736
542000
604704
682624
770528
After:
15504
16048
16144
16256
16320
16320
16752
16752
16752
16752
