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ko/news/_posts/2023-09-14-ruby-3-3-0-preview2-released.md

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+---
+layout: news_post
+title: "Ruby 3.3.0-preview2 Released"
+author: "naruse"
+translator:
+date: 2023-09-14 00:00:00 +0000
+lang: en
+---
+
+{% assign release = site.data.releases | where: "version", "3.3.0-preview2" | first %}
+
+We are pleased to announce the release of Ruby {{ release.version }}. Ruby 3.3 adds a new pure-Ruby JIT compiler named RJIT, uses Lrama as a parser generator, and many performance improvements especially YJIT.
+
+## RJIT
+
+* Introduced a pure-Ruby JIT compiler RJIT and replaced MJIT.
+  * RJIT supports only x86\_64 architecture on Unix platforms.
+  * Unlike MJIT, it doesn't require a C compiler at runtime.
+* RJIT exists only for experimental purposes.
+  * You should keep using YJIT in production.
+* If you are interested in developing JIT for Ruby, please check out [k0kubun's presentation on Day 3 of RubyKaigi](https://rubykaigi.org/2023/presentations/k0kubun.html#day3).
+
+## Use Lrama instead of Bison
+
+* Replace Bison with [Lrama LALR parser generator](https://github.com/yui-knk/lrama) [Feature #19637](https://bugs.ruby-lang.org/issues/19637)
+  * If you have interest, please see [The future vision of Ruby Parser](https://rubykaigi.org/2023/presentations/spikeolaf.html)
+
+## YJIT
+
+* Major performance improvements over 3.2
+  * Support for splat and rest arguments has been improved.
+  * Registers are allocated for stack operations of the virtual machine.
+  * More calls with optional arguments are compiled.
+  * Exception handlers are also compiled.
+  * Instance variables no longer exit to the interpreter
+    with megamorphic Object Shapes.
+  * Unsupported call types no longer exit to the interpreter.
+  * `Integer#!=`, `String#!=`, `Kernel#block_given?`, `Kernel#is_a?`,
+    `Kernel#instance_of?`, `Module#===` are specially optimized.
+  * Now more than 3x faster than the interpreter on optcarrot!
+* Metadata for compiled code uses a lot less memory.
+* Generate more compact code on ARM64
+* Option to start YJIT in paused mode and then later enable it manually
+  * `--yjit-pause` and `RubyVM::YJIT.resume`
+  * This can be used to enable YJIT only once your application is done booting
+* `ratio_in_yjit` stat produced by `--yjit-stats` is now avaiable in release builds,
+  a special stats or dev build is no longer required.
+* Exit tracing option now supports sampling
+  * `--trace-exits-sample-rate=N`
+* More thorough testing and multiple bug fixes
+
+
+
+## Other Notable New Features
+
+### Language
+
+
+
+## Performance improvements
+
+* `defined?(@ivar)` is optimized with Object Shapes.
+
+## Other notable changes since 3.2
+
+### IRB
+
+IRB has received several enhancements, including but not limited to:
+
+- Advanced `irb:rdbg` integration that provides an equivalent debugging experience to `pry-byebug` ([doc](https://github.com/ruby/irb#debugging-with-irb)).
+- Pager support for commands like `ls` and `show_cmds`.
+- More accurate and helpful information provided by the `ls` and `show_source` commands.
+
+In addition, IRB has also undergone extensive refactoring and received dozens of bug fixes to facilitate easier future enhancements.
+
+## Compatibility issues
+
+Note: Excluding feature bug fixes.
+
+### Removed constants
+
+The following deprecated constants are removed.
+
+
+
+### Removed methods
+
+The following deprecated methods are removed.
+
+
+
+## Stdlib compatibility issues
+
+### `ext/readline` is retired
+
+* We have `reline` that is pure Ruby implementation compatible with `ext/readline` API. We rely on `reline` in the future. If you need to use `ext/readline`, you can install `ext/readline` via rubygems.org with `gem install readline-ext`.
+* We no longer need to install libraries like `libreadline` or `libedit`.
+
+## C API updates
+
+### Updated C APIs
+
+The following APIs are updated.
+
+
+
+### Removed C APIs
+
+The following deprecated APIs are removed.
+
+
+
+## Standard library updates
+
+RubyGems and Bundler warn if users require gem that is scheduled to become the bundled gems in the future version of Ruby.
+
+The following default gems are updated.
+
+* RubyGems 3.5.0.dev
+* bigdecimal 3.1.4
+* bundler 2.5.0.dev
+* csv 3.2.8
+* erb 4.0.3
+* fiddle 1.1.2
+* fileutils 1.7.1
+* irb 1.7.4
+* nkf 0.1.3
+* optparse 0.4.0.pre.1
+* psych 5.1.0
+* reline 0.3.8
+* stringio 3.0.9
+* strscan 3.0.7
+* syntax_suggest 1.1.0
+* time 0.2.2
+* timeout 0.4.0
+* uri 0.12.2
+* yarp 0.9.0
+
+The following bundled gems are updated.
+
+* minitest 5.19.0
+* test-unit 3.6.1
+* rexml 3.2.6
+* rss 0.3.0
+* net-imap 0.3.7
+* rbs 3.2.1
+* typeprof 0.21.8
+* debug 1.8.0
+
+The following default gem is now bundled.
+
+* racc 1.7.1
+
+See GitHub releases like [Logger](https://github.com/ruby/logger/releases) or
+changelog for details of the default gems or bundled gems.
+
+See [NEWS](https://github.com/ruby/ruby/blob/{{ release.tag }}/NEWS.md)
+or [commit logs](https://github.com/ruby/ruby/compare/v3_2_0...{{ release.tag }})
+for more details.
+
+With those changes, [{{ release.stats.files_changed }} files changed, {{ release.stats.insertions }} insertions(+), {{ release.stats.deletions }} deletions(-)](https://github.com/ruby/ruby/compare/v3_2_0...{{ release.tag }}#file_bucket)
+since Ruby 3.2.0!
+
+
+## Download
+
+* <{{ release.url.gz }}>
+
+      SIZE: {{ release.size.gz }}
+      SHA1: {{ release.sha1.gz }}
+      SHA256: {{ release.sha256.gz }}
+      SHA512: {{ release.sha512.gz }}
+
+* <{{ release.url.xz }}>
+
+      SIZE: {{ release.size.xz }}
+      SHA1: {{ release.sha1.xz }}
+      SHA256: {{ release.sha256.xz }}
+      SHA512: {{ release.sha512.xz }}
+
+* <{{ release.url.zip }}>
+
+      SIZE: {{ release.size.zip }}
+      SHA1: {{ release.sha1.zip }}
+      SHA256: {{ release.sha256.zip }}
+      SHA512: {{ release.sha512.zip }}
+
+## What is Ruby
+
+Ruby was first developed by Matz (Yukihiro Matsumoto) in 1993,
+and is now developed as Open Source. It runs on multiple platforms
+and is used all over the world especially for web development.