|
| 1 | +--- |
| 2 | +layout: news_post |
| 3 | +title: "Ruby 2.6.0-rc1 Released" |
| 4 | +author: "naruse" |
| 5 | +translator: |
| 6 | +date: 2018-12-06 00:00:00 +0000 |
| 7 | +lang: en |
| 8 | +--- |
| 9 | + |
| 10 | +We are pleased to announce the release of Ruby 2.6.0-rc1. |
| 11 | + |
| 12 | +Ruby 2.6.0-rc1 is the third preview toward Ruby 2.6.0. |
| 13 | +This rc1 is released to test new features before coming Release Candidate. |
| 14 | + |
| 15 | +## JIT |
| 16 | + |
| 17 | +Ruby 2.6 introduces an initial implementation of JIT (Just-in-time) compiler. |
| 18 | + |
| 19 | +JIT compiler aims to improve performance of any Ruby program execution. |
| 20 | +Unlike ordinary JIT compilers for other languages, Ruby's JIT compiler does JIT compilation in a unique way, which prints C code to a disk and spawns common C compiler process to generate native code. |
| 21 | +See also: [MJIT organization by Vladimir Makarov](https://github.com/vnmakarov/ruby/tree/rtl_mjit_branch#mjit-organization). |
| 22 | + |
| 23 | +How to use: Just specify `--jit` in command line or `$RUBYOPT` environment variable. |
| 24 | +Specifying `--jit-verbose=1` allows to print basic information of ongoing JIT compilation. See `ruby --help` for other options. |
| 25 | + |
| 26 | +The main purpose of this JIT release is to provide a chance to check if it works for your platform and to find out security risks before the 2.6 release. |
| 27 | +JIT compiler is supported when Ruby is built by GCC, Clang, or Microsoft VC++, which needs to be available on runtime. Otherwise you can't use it for now. |
| 28 | + |
| 29 | +As of Ruby 2.6.0-rc1, we achieved 1.7x faster performance than Ruby 2.5 on CPU-intensive non-trivial benchmark workload called Optcarrot <https://gist.github.com/k0kubun/d7f54d96f8e501bbbc78b927640f4208>. We're going to improve the performance on memory-intensive workload like Rails application as well. |
| 30 | + |
| 31 | +Stay tuned for the new age of Ruby's performance. |
| 32 | + |
| 33 | +## RubyVM::AbstractSyntaxTree [Experimental] |
| 34 | + |
| 35 | +Ruby 2.6 introduces `RubyVM::AbstractSyntaxTree` module. |
| 36 | + |
| 37 | +This module has `parse` method which parses a given ruby code of string and returns AST (Abstract Syntax Tree) nodes, and `parse_file` method which parses a given ruby code file and returns AST nodes. |
| 38 | +`RubyVM::AbstractSyntaxTree::Node` class is also introduced. You can get location information and children nodes from `Node` objects. This feature is experimental. Compatibility of the structure of AST nodes are not guaranteed. |
| 39 | + |
| 40 | +## New Features |
| 41 | + |
| 42 | +* Add a new alias `then` to `Kernel#yield_self`. [[Feature #14594]](https://bugs.ruby-lang.org/issues/14594) |
| 43 | + |
| 44 | +* `else` without `rescue` now causes a syntax error. [EXPERIMENTAL] |
| 45 | + |
| 46 | +* constant names may start with a non-ASCII capital letter. [[Feature #13770]](https://bugs.ruby-lang.org/issues/13770) |
| 47 | + |
| 48 | +* endless range [[Feature #12912]](https://bugs.ruby-lang.org/issues/12912) |
| 49 | + |
| 50 | + An endless range, `(1..)`, is introduced. It works as it has no end. This shows typical use cases: |
| 51 | + |
| 52 | + ary[1..] # identical to ary[1..-1] without magical -1 |
| 53 | + (1..).each {|index| ... } # inifinite loop from index 1 |
| 54 | + ary.zip(1..) {|elem, index| ... } # ary.each.with_index(1) { ... } |
| 55 | + |
| 56 | +* Add `Binding#source_location`. [[Feature #14230]](https://bugs.ruby-lang.org/issues/14230) |
| 57 | + |
| 58 | + This method returns the source location of binding, a 2-element array of `__FILE__` and `__LINE__`. Traditionally, the same information could be retrieved by `eval("[__FILE__, __LINE__]", binding)`, but we are planning to change this behavior so that `Kernel#eval` ignores binding's source location [[Bug #4352]](https://bugs.ruby-lang.org/issues/4352). So, users should use this newly-introduced method instead of `Kernel#eval`. |
| 59 | + |
| 60 | +* Add `:exception` option to let `Kernel#system` raise error instead of returning `false`. [[Feature #14386]](https://bugs.ruby-lang.org/issues/14386) |
| 61 | + |
| 62 | +* add the oneshot mode [[Feature#15022]](https://bugs.ruby-lang.org/issues/15022) |
| 63 | + * This mode checks "whether each line was executed at least once or not", instead of "how many times each line was executed". A hook for each line is fired at most once, and after it is fired the hook flag is removed, i.e., it runs with zero overhead. |
| 64 | + * Add `:oneshot_lines` keyword argument to Coverage.start. |
| 65 | + * Add `:stop` and `:clear` keyword arguments to Coverage.result. If `clear` is true, it clears the counters to zero. If `stop` is true, it disables coverage measurement. |
| 66 | + * Coverage.line_stub, which is a simple helper function that creates the "stub" of line coverage from a given source code. |
| 67 | + |
| 68 | +* `FileUtils#cp_lr`. [[Feature #4189]](https://bugs.ruby-lang.org/issues/4189) |
| 69 | + |
| 70 | +## Performance improvements |
| 71 | + |
| 72 | +* Speedup `Proc#call` because we don't need to care about `$SAFE` any more. |
| 73 | + [[Feature #14318]](https://bugs.ruby-lang.org/issues/14318) |
| 74 | + |
| 75 | + With `lc_fizzbuzz` benchmark which uses `Proc#call` so many times we can measure |
| 76 | + x1.4 improvements [[Bug #10212]](https://bugs.ruby-lang.org/issues/10212). |
| 77 | + |
| 78 | +* Speedup `block.call` where `block` is passed block parameter. [[Feature #14330]](https://bugs.ruby-lang.org/issues/14330) |
| 79 | + |
| 80 | + Ruby 2.5 improves block passing performance. [[Feature #14045]](https://bugs.ruby-lang.org/issues/14045) |
| 81 | + Additionally, Ruby 2.6 improves the performance of passed block calling. |
| 82 | + With micro-benchmark we can observe x2.6 improvement. |
| 83 | + |
| 84 | +* Transient Heap (theap) is introduced. [[Bug #14858]](https://bugs.ruby-lang.org/issues/14858) [[Feature #14989]](https://bugs.ruby-lang.org/issues/14989) |
| 85 | + theap is managed heap for short-living memory objects which are pointed by |
| 86 | + specific classes (Array, Hash, Object, and Struct). For example, making small |
| 87 | + and short-living Hash object is x2 faster. With rdoc benchmark, we observed |
| 88 | + 6-7% performance improvement. |
| 89 | + |
| 90 | +## Other notable changes since 2.5 |
| 91 | + |
| 92 | +* `$SAFE` is a process global state and we can set `0` again. [[Feature #14250]](https://bugs.ruby-lang.org/issues/14250) |
| 93 | + |
| 94 | +* Passing `safe_level` to `ERB.new` is deprecated. `trim_mode` and `eoutvar` arguments are changed to keyword arguments. [[Feature #14256]](https://bugs.ruby-lang.org/issues/14256) |
| 95 | + |
| 96 | +* Supported Unicode version is updated to 11. It is planed to update 12 and 12.1 in future TEENY releases of Ruby 2.6. |
| 97 | + |
| 98 | +* Merge RubyGems 3.0.0.beta3. `--ri` and `--rdoc` options was removed. Please use `--document` and `--no-document` options instead of them. |
| 99 | + |
| 100 | +* Merge [Bundler](https://github.com/bundler/bundler) as Default gems. |
| 101 | + |
| 102 | +See [NEWS](https://github.com/ruby/ruby/blob/v2_6_0_rc1/NEWS) |
| 103 | +or [commit logs](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_rc1) |
| 104 | +for details. |
| 105 | + |
| 106 | +With those changes, |
| 107 | +[6376 files changed, 227364 insertions(+), 51599 deletions(-)](https://github.com/ruby/ruby/compare/v2_5_0...v2_6_0_rc1) |
| 108 | +since Ruby 2.5.0! |
| 109 | + |
| 110 | +Enjoy programming with Ruby 2.6.0-rc1! |
| 111 | + |
| 112 | +## Download |
| 113 | + |
| 114 | +* <https://cache.ruby-lang.org/pub/ruby/2.6/2.6.0-rc1.tar.bz2> |
| 115 | + |
| 116 | + SIZE: 16823448 bytes |
| 117 | + SHA1: 889db7731fd43f6dbf7f31ffdb0a29bba1a8d356 |
| 118 | + SHA256: 6d6183639ed9c02320d7132e97c65489a39e24d8b55fc4ed35ac53d1189cb61d |
| 119 | + SHA512: ad101adee5c43f3645561e73970f15d4e9141f707da69a92e224575c665949e18ca53389e5315fca2ea393 |
| 120 | +4d77967a59e304353cde4a915537e7c4e4ee20be73 |
| 121 | +* <https://cache.ruby-lang.org/pub/ruby/2.6/2.6.0-rc1.tar.bz2> |
| 122 | + |
| 123 | + SIZE: 20737499 bytes |
| 124 | + SHA1: 457e39aee1978da5e42af42a6ad230421544aa07 |
| 125 | + SHA256: 2bcdf468de499e4d6983d60d63dcc883f4c54fdc05a08a54eb93d315477bc4cc |
| 126 | + SHA512: 0842fae8a199f6c1e76f5d775edbf468e18a54f0419324eb73595e0268c728c71733371d71dc2fa342105dbc487987ca5556948a9ef067276a7b5f552462802a |
| 127 | +* <https://cache.ruby-lang.org/pub/ruby/2.6/2.6.0-rc1.tar.bz2> |
| 128 | + |
| 129 | + SIZE: 14607078 bytes |
| 130 | + SHA1: 269fe9d414d7731e4a63959fadffe5c50c08ce0e |
| 131 | + SHA256: b4e9c0e8801946e9f0baba30948955f4341e9e04f363c206b7bd774208053eb5 |
| 132 | + SHA512: cbd6281b2aab6fbce3f699c1ab57e5423304dca7a547a0b3cd4e8e980326dc7b85b2ca2bfaf3f3a648d40f4222fdf1740d81d422790ee7ae1ba1ed33eb11e3e8 |
| 133 | +* <https://cache.ruby-lang.org/pub/ruby/2.6/2.6.0-rc1.tar.bz2> |
| 134 | + |
| 135 | + SIZE: 11851908 bytes |
| 136 | + SHA1: 3b93fdf1c5bd969ab4fe0a8176a6cf64e4597e6e |
| 137 | + SHA256: 21d9d54c20e45ccacecf8bea4dfccd05edc52479c776381ae98ef6a7b4afa739 |
| 138 | + SHA512: 3d93d8d80e4900e8b3a27f904ed60581cebc6c55f4ab7acafc81e95001f92f3ea4ddec2da6169b1ed5e0146f7b7c35c1c13b3243955d5825c72170834fe933f3 |
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