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| # optional | ||
| preview: | ||
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| - 3.4.0-preview2 | ||
| - 3.4.0-rc1 | ||
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| stable: | ||
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| --- | ||
| layout: news_post | ||
| title: "Ruby 3.4.0 rc1 Released" | ||
| author: "naruse" | ||
| translator: | ||
| date: 2024-12-12 00:00:00 +0000 | ||
| lang: en | ||
| --- | ||
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| {% assign release = site.data.releases | where: "version", "3.4.0-rc1" | first %} | ||
| We are pleased to announce the release of Ruby {{ release.version }}. | ||
| In | ||
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| ## Prism | ||
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| Switch the default parser from parse.y to Prism. [[Feature #20564]] | ||
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| ## Modular GC | ||
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| * Alternative garbage collector (GC) implementations can be loaded dynamically | ||
| through the modular garbage collector feature. To enable this feature, | ||
| configure Ruby with `--with-modular-gc` at build time. GC libraries can be | ||
| loaded at runtime using the environment variable `RUBY_GC_LIBRARY`. | ||
| [[Feature #20351]] | ||
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| * Ruby's built-in garbage collector has been split into a separate file at | ||
| `gc/default/default.c` and interacts with Ruby using an API defined in | ||
| `gc/gc_impl.h`. The built-in garbage collector can now also be built as a | ||
| library using `make modular-gc MODULAR_GC=default` and enabled using the | ||
| environment variable `RUBY_GC_LIBRARY=default`. [[Feature #20470]] | ||
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| * An experimental GC library is provided based on [MMTk](https://www.mmtk.io/). | ||
| This GC library can be built using `make modular-gc MODULAR_GC=mmtk` and | ||
| enabled using the environment variable `RUBY_GC_LIBRARY=mmtk`. This requires | ||
| the Rust toolchain on the build machine. [[Feature #20860]] | ||
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| ## Language changes | ||
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| * String literals in files without a `frozen_string_literal` comment now behave | ||
| as if they were frozen. If they are mutated a deprecation warning is emitted. | ||
| These warnings can be enabled with `-W:deprecated` or by setting `Warning[:deprecated] = true`. | ||
| To disable this change, you can run Ruby with the `--disable-frozen-string-literal` | ||
| command line argument. [[Feature #20205]] | ||
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| * `it` is added to reference a block parameter. [[Feature #18980]] | ||
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| * Keyword splatting `nil` when calling methods is now supported. | ||
| `**nil` is treated similarly to `**{}`, passing no keywords, | ||
| and not calling any conversion methods. [[Bug #20064]] | ||
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| * Block passing is no longer allowed in index. [[Bug #19918]] | ||
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| * Keyword arguments are no longer allowed in index. [[Bug #20218]] | ||
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| ## YJIT | ||
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| TL;DR: | ||
| * Better performance on most benchmarks on both x86-64 and arm64 platforms. | ||
| * Reduced memory usage of compilation metadata | ||
| * Multiple bug fixes. YJIT is now even more robust and better tested. | ||
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| New features: | ||
| * Add unified memory limit via `--yjit-mem-size` command-line option (default 128MiB) | ||
| which tracks total YJIT memory usage and is more intuitive than the | ||
| old `--yjit-exec-mem-size`. | ||
| * More statistics now always available via `RubyVM::YJIT.runtime_stats` | ||
| * Add compilation log to track what gets compiled via `--yjit-log` | ||
| * Tail of the log also available at run-time via `RubyVM::YJIT.log` | ||
| * Add support for shareable consts in multi-ractor mode | ||
| * Can now trace counted exits with `--yjit-trace-exits=COUNTER` | ||
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| New optimizations: | ||
| * Compressed context reduces memory needed to store YJIT metadata | ||
| * Improved allocator with ability to allocate registers for local variables | ||
| * When YJIT is enabled, use more Core primitives written in Ruby: | ||
| * `Array#each`, `Array#select`, `Array#map` rewritten in Ruby for better performance [[Feature #20182]]. | ||
| * Ability to inline small/trivial methods such as: | ||
| * Empty methods | ||
| * Methods returning a constant | ||
| * Methods returning `self` | ||
| * Methods directly returning an argument | ||
| * Specialized codegen for many more runtime methods | ||
| * Optimize `String#getbyte`, `String#setbyte` and other string methods | ||
| * Optimize bitwise operations to speed up low-level bit/byte manipulation | ||
| * Various other incremental optimizations | ||
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| ## Core classes updates | ||
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| Note: We're only listing outstanding class updates. | ||
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| * Exception | ||
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| * `Exception#set_backtrace` now accepts an array of `Thread::Backtrace::Location`. | ||
| `Kernel#raise`, `Thread#raise` and `Fiber#raise` also accept this new format. [[Feature #13557]] | ||
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| * Range | ||
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| * `Range#size` now raises `TypeError` if the range is not iterable. [[Misc #18984]] | ||
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| ## Compatibility issues | ||
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| Note: Excluding feature bug fixes. | ||
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| * Error messages and backtrace displays have been changed. | ||
| * Use a single quote instead of a backtick as a opening quote. [[Feature #16495]] | ||
| * Display a class name before a method name (only when the class has a permanent name). [[Feature #19117]] | ||
| * `Kernel#caller`, `Thread::Backtrace::Location`'s methods, etc. are also changed accordingly. | ||
|
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| ``` | ||
| Old: | ||
| test.rb:1:in `foo': undefined method `time' for an instance of Integer | ||
| from test.rb:2:in `<main>' | ||
| New: | ||
| test.rb:1:in 'Object#foo': undefined method 'time' for an instance of Integer | ||
| from test.rb:2:in '<main>' | ||
| ``` | ||
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| ## C API updates | ||
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| * `rb_newobj` and `rb_newobj_of` (and corresponding macros `RB_NEWOBJ`, `RB_NEWOBJ_OF`, `NEWOBJ`, `NEWOBJ_OF`) have been removed. [[Feature #20265]] | ||
| * Removed deprecated function `rb_gc_force_recycle`. [[Feature #18290]] | ||
|
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| ## Miscellaneous changes | ||
|
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| * Passing a block to a method which doesn't use the passed block will show | ||
| a warning on verbose mode (`-w`). | ||
| [[Feature #15554]] | ||
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| * Redefining some core methods that are specially optimized by the interpeter | ||
| and JIT like `String.freeze` or `Integer#+` now emits a performance class | ||
| warning (`-W:performance` or `Warning[:performance] = true`). | ||
| [[Feature #20429]] | ||
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| See GitHub releases like [Logger](https://github.com/ruby/logger/releases) or | ||
| changelog for details of the default gems or bundled gems. | ||
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| See [NEWS](https://github.com/ruby/ruby/blob/{{ release.tag }}/NEWS.md) | ||
| or [commit logs](https://github.com/ruby/ruby/compare/v3_3_0...{{ release.tag }}) | ||
| for more details. | ||
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| With those changes, [{{ release.stats.files_changed }} files changed, {{ release.stats.insertions }} insertions(+), {{ release.stats.deletions }} deletions(-)](https://github.com/ruby/ruby/compare/v3_3_0...{{ release.tag }}#file_bucket) | ||
| since Ruby 3.3.0! | ||
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| ## Download | ||
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| * <{{ release.url.gz }}> | ||
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| SIZE: {{ release.size.gz }} | ||
| SHA1: {{ release.sha1.gz }} | ||
| SHA256: {{ release.sha256.gz }} | ||
| SHA512: {{ release.sha512.gz }} | ||
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| * <{{ release.url.xz }}> | ||
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| SIZE: {{ release.size.xz }} | ||
| SHA1: {{ release.sha1.xz }} | ||
| SHA256: {{ release.sha256.xz }} | ||
| SHA512: {{ release.sha512.xz }} | ||
|
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| * <{{ release.url.zip }}> | ||
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| SIZE: {{ release.size.zip }} | ||
| SHA1: {{ release.sha1.zip }} | ||
| SHA256: {{ release.sha256.zip }} | ||
| SHA512: {{ release.sha512.zip }} | ||
|
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| ## What is Ruby | ||
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| 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. | ||
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| [Feature #13557]: https://bugs.ruby-lang.org/issues/13557 | ||
| [Feature #15554]: https://bugs.ruby-lang.org/issues/15554 | ||
| [Feature #16495]: https://bugs.ruby-lang.org/issues/16495 | ||
| [Feature #18290]: https://bugs.ruby-lang.org/issues/18290 | ||
| [Feature #18980]: https://bugs.ruby-lang.org/issues/18980 | ||
| [Misc #18984]: https://bugs.ruby-lang.org/issues/18984 | ||
| [Feature #19117]: https://bugs.ruby-lang.org/issues/19117 | ||
| [Bug #19918]: https://bugs.ruby-lang.org/issues/19918 | ||
| [Bug #20064]: https://bugs.ruby-lang.org/issues/20064 | ||
| [Feature #20182]: https://bugs.ruby-lang.org/issues/20182 | ||
| [Feature #20205]: https://bugs.ruby-lang.org/issues/20205 | ||
| [Bug #20218]: https://bugs.ruby-lang.org/issues/20218 | ||
| [Feature #20265]: https://bugs.ruby-lang.org/issues/20265 | ||
| [Feature #20351]: https://bugs.ruby-lang.org/issues/20351 | ||
| [Feature #20429]: https://bugs.ruby-lang.org/issues/20429 | ||
| [Feature #20470]: https://bugs.ruby-lang.org/issues/20470 | ||
| [Feature #20564]: https://bugs.ruby-lang.org/issues/20564 | ||
| [Feature #20860]: https://bugs.ruby-lang.org/issues/20860 |