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[ruby-dev:52062] [Ruby master Bug#18024] Ractor crashes when connections are closed in multiple Ractors
by tagomoris (Satoshi Tagomori) 14 Nov '23

14 Nov '23

Issue #18024 has been updated by tagomoris (Satoshi Tagomori). I retried this script on my laptop (macOS Ventura) and Ruby 3.2.2, and I also couldn't reproduce the crash. So the problem could be an environment-specific one. Could someone close this? ---------------------------------------- Bug #18024: Ractor crashes when connections are closed in multiple Ractors https://bugs.ruby-lang.org/issues/18024#change-105322 * Author: tagomoris (Satoshi Tagomori) * Status: Assigned * Priority: Normal * Assignee: ko1 (Koichi Sasada) * ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20] * Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- When multiple Ractors will accept and close connections, that script caused the crash shown below. This pattern is taken when we want to distribute the overhead of `accept` to multiple CPU cores. Script: ``` require 'socket' try_times = 10 worker_num = 2 listener = TCPServer.new("127.0.0.1", 8228) listener.listen(100) workers = worker_num.times.map do |i| Ractor.new(i, listener.dup) do |index, sock| while conn = sock.accept begin data = conn.read p "Worker|#{index} Data: #{data}" conn.close rescue => e p "Worker|#{index} #{e.full_message}" end end rescue => e $stderr.puts "Error, worker#{index}: #{e.full_message}" end end p "Starting a sender" sender = Ractor.new(try_times) do |tries| tries.times.each do s = TCPSocket.new("127.0.0.1", 8228) s.write("yay") ensure s.close rescue nil end end sender.take workers.each{|w| w.take} p "End" ``` Crash report: ``` <internal:ractor>:267: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues. "Starting a sender" "Worker|1 Data: yay" snippets/ractor_accept.rb:30: [BUG] Bus Error at 0x00000014000001f5 ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20] -- Crash Report log information -------------------------------------------- See Crash Report log file under the one of following: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0006 p:---- s:0023 e:000022 CFUNC :close c:0005 p:0028 s:0019 e:000017 BLOCK snippets/ractor_accept.rb:30 [FINISH] c:0004 p:---- s:0014 e:000013 CFUNC :times c:0003 p:---- s:0011 e:000010 CFUNC :each c:0002 p:0008 s:0007 e:000006 BLOCK snippets/ractor_accept.rb:26 [FINISH] c:0001 p:---- s:0003 e:000002 (none) [FINISH] -- Ruby level backtrace information ---------------------------------------- snippets/ractor_accept.rb:26:in `block in <main>' snippets/ractor_accept.rb:26:in `each' snippets/ractor_accept.rb:26:in `times' snippets/ractor_accept.rb:30:in `block (2 levels) in <main>' snippets/ractor_accept.rb:30:in `close' -- Other runtime information ----------------------------------------------- * Loaded script: snippets/ractor_accept.rb * Loaded features: 0 enumerator.so 1 thread.rb 2 rational.so 3 complex.so 4 ruby2_keywords.rb 5 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250000000-260000000 r-- 260000000-270000000 r-- 270000000-280000000 r-- fc0000000-1000000000 --- 1000000000-7000000000 --- [IMPORTANT] Don't forget to include the Crash Report log file under DiagnosticReports directory in bug reports. Abort trap: 6 ``` ---Files-------------------------------- ruby_2021-07-06-231613_Moris-Macbook-Air.crash (35.9 KB) ruby_2021-08-24-203317_Moris-Macbook-Air.crash (17.4 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52061] [Ruby master Bug#18024] Ractor crashes when connections are closed in multiple Ractors
by dazuma (Daniel Azuma) 13 Nov '23

13 Nov '23

Issue #18024 has been updated by dazuma (Daniel Azuma). Also not able to reproduce on `ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-darwin22]` or `ruby 3.3.0dev (2023-11-13T21:00:10Z master e8ab3f7010) [x86_64-darwin23]`. I wonder if this was an environment issue in the original report. ---------------------------------------- Bug #18024: Ractor crashes when connections are closed in multiple Ractors https://bugs.ruby-lang.org/issues/18024#change-105315 * Author: tagomoris (Satoshi Tagomori) * Status: Assigned * Priority: Normal * Assignee: ko1 (Koichi Sasada) * ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20] * Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- When multiple Ractors will accept and close connections, that script caused the crash shown below. This pattern is taken when we want to distribute the overhead of `accept` to multiple CPU cores. Script: ``` require 'socket' try_times = 10 worker_num = 2 listener = TCPServer.new("127.0.0.1", 8228) listener.listen(100) workers = worker_num.times.map do |i| Ractor.new(i, listener.dup) do |index, sock| while conn = sock.accept begin data = conn.read p "Worker|#{index} Data: #{data}" conn.close rescue => e p "Worker|#{index} #{e.full_message}" end end rescue => e $stderr.puts "Error, worker#{index}: #{e.full_message}" end end p "Starting a sender" sender = Ractor.new(try_times) do |tries| tries.times.each do s = TCPSocket.new("127.0.0.1", 8228) s.write("yay") ensure s.close rescue nil end end sender.take workers.each{|w| w.take} p "End" ``` Crash report: ``` <internal:ractor>:267: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues. "Starting a sender" "Worker|1 Data: yay" snippets/ractor_accept.rb:30: [BUG] Bus Error at 0x00000014000001f5 ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20] -- Crash Report log information -------------------------------------------- See Crash Report log file under the one of following: * ~/Library/Logs/DiagnosticReports * /Library/Logs/DiagnosticReports for more details. Don't forget to include the above Crash Report log file in bug reports. -- Control frame information ----------------------------------------------- c:0006 p:---- s:0023 e:000022 CFUNC :close c:0005 p:0028 s:0019 e:000017 BLOCK snippets/ractor_accept.rb:30 [FINISH] c:0004 p:---- s:0014 e:000013 CFUNC :times c:0003 p:---- s:0011 e:000010 CFUNC :each c:0002 p:0008 s:0007 e:000006 BLOCK snippets/ractor_accept.rb:26 [FINISH] c:0001 p:---- s:0003 e:000002 (none) [FINISH] -- Ruby level backtrace information ---------------------------------------- snippets/ractor_accept.rb:26:in `block in <main>' snippets/ractor_accept.rb:26:in `each' snippets/ractor_accept.rb:26:in `times' snippets/ractor_accept.rb:30:in `block (2 levels) in <main>' snippets/ractor_accept.rb:30:in `close' -- Other runtime information ----------------------------------------------- * Loaded script: snippets/ractor_accept.rb * Loaded features: 0 enumerator.so 1 thread.rb 2 rational.so 3 complex.so 4 ruby2_keywords.rb 5 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250000000-260000000 r-- 260000000-270000000 r-- 270000000-280000000 r-- fc0000000-1000000000 --- 1000000000-7000000000 --- [IMPORTANT] Don't forget to include the Crash Report log file under DiagnosticReports directory in bug reports. Abort trap: 6 ``` ---Files-------------------------------- ruby_2021-07-06-231613_Moris-Macbook-Air.crash (35.9 KB) ruby_2021-08-24-203317_Moris-Macbook-Air.crash (17.4 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52060] [Ruby master Bug#11183] Cumulative error on Complex::I ** 100000000000000000000000000000000
by JesseJohnson (Jesse Johnson) 13 Nov '23

13 Nov '23

Issue #11183 has been updated by JesseJohnson (Jesse Johnson). This behavior still exists in Ruby 3.2.2. In order to fix this Complex#** would need to handle the special cases of self being 0+1i and 0-1i. Correct: ``` irb(main):052:0> Complex(0, -1) ** 1000000000000000000 => (1+0i) irb(main):053:0> Complex(0, -1) ** 1000000000000000001 => (0-1i) irb(main):054:0> Complex(0, -1) ** 1000000000000000002 => (-1+0i) irb(main):055:0> Complex(0, -1) ** 1000000000000000003 => (0+1i) irb(main):056:0> Complex(0, -1) ** 1000000000000000004 => (1+0i) irb(main):057:0> Complex(0, 1) ** 1000000000000000000 => (1+0i) irb(main):058:0> Complex(0, 1) ** 1000000000000000001 => (0+1i) irb(main):059:0> Complex(0, 1) ** 1000000000000000002 => (-1+0i) irb(main):060:0> Complex(0, 1) ** 1000000000000000003 => (0-1i) irb(main):061:0> Complex(0, 1) ** 1000000000000000004 => (1+0i) ``` Suboptimal: ``` irb(main):066:0> Complex(0, -1) ** 10000000000000000000 (irb):66: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):067:0> Complex(0, -1) ** 10000000000000000001 (irb):67: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):068:0> Complex(0, -1) ** 10000000000000000002 (irb):68: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):069:0> Complex(0, -1) ** 10000000000000000003 (irb):69: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):070:0> Complex(0, -1) ** 10000000000000000004 (irb):70: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):071:0> Complex(0, 1) ** 10000000000000000000 (irb):71: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):072:0> Complex(0, 1) ** 10000000000000000001 (irb):72: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):073:0> Complex(0, 1) ** 10000000000000000002 (irb):73: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):074:0> Complex(0, 1) ** 10000000000000000003 (irb):74: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):075:0> Complex(0, 1) ** 10000000000000000004 (irb):75: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):076:0> in):070:0> Complex(0, -1) ** 10000000000000000004 => (-0.9125701512929312-0.40892018655135703i) ``` ---------------------------------------- Bug #11183: Cumulative error on Complex::I ** 100000000000000000000000000000000 https://bugs.ruby-lang.org/issues/11183#change-105310 * Author: ko1 (Koichi Sasada) * Status: Open * Priority: Normal * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- ``` p Complex::I ** 100000000000000000000000000000000 ``` が、32bit 環境だと、 ``` ruby 2.3.0dev (2015-05-21 trunk 50502) [i386-mswin32_110] t.rb:1: warning: in a**b, b may be too big (-0.08483712490438944+1.5651333429325577e+32i) ``` こんな感じで、変な値が出ます。 ``` # ubuntu 64bit だと (0.9943722416631883-0.10594264962575697i) ``` できれば、こっちも 1+0i にぴたっとしてるといいのでしょうが。この問題に対する、うささんのコメント: > 真面目にコードを読むと、Complex#** は引数(指数)がFixnumでない場合は複素数をいったん極座標形式に変換してからrとθの双方をそれぞれ計算し、最後にf_complex_polarを使ってComplexオブジェクトにしてるのですが、θはFloatなので当然に誤差が蓄積し、という感じです。まあ、誤差が蓄積しなかったとしても、f_complex_polarの中でせっかくθが0°・90°・180°・270°のケースを特別扱いしようとしてるのにdouble値を==で比較してるのでまったく救われそうにない、という感じではありますが。 > θをn倍する計算に対して、nが整数である場合は360°は0°と同じという性質を利用して誤差を蓄積しない計算をすればだいぶマシになるとは思いますが、しかしめんどくさいっすね。 ---Files-------------------------------- my_complex.diff (2.09 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52059] [Ruby master Bug#10436] ruby -c and ripper inconsistency: m(&nil) {}
by jemmai (Jemma Issroff) 13 Nov '23

13 Nov '23

Issue #10436 has been updated by jemmai (Jemma Issroff). This bug still exists on Ripper. Should we try revive @jeremyevans0's patch? It is potentially worth noting that Prism creates a `ParseError`: "Multiple block arguments; only one block is allowed" ---------------------------------------- Bug #10436: ruby -c and ripper inconsistency: m(&nil) {} https://bugs.ruby-lang.org/issues/10436#change-105301 * Author: akr (Akira Tanaka) * Status: Open * Priority: Normal * ruby -v: ruby 2.2.0dev (2014-10-27 trunk 48168) [x86_64-linux] * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN ---------------------------------------- m(&nil) {} というまちがったコードは ruby -c でちゃんとエラーになるのに、 Ripper.sexp ではならないようです。 ``` % cat z.rb m(&nil) {} % ruby -c z.rb z.rb:1: both block arg and actual block given % ruby -rripper -e 'p Ripper.sexp(STDIN.read)' < z.rb [:program, [[:method_add_block, [:method_add_arg, [:fcall, [:@ident, "m", [1, 0]]], [:arg_paren, [:args_add_block, [], [:var_ref, [:@kw, "nil", [1, 3]]]]]], [:brace_block, nil, [[:void_stmt]]]]]] % ruby -v ruby 2.2.0dev (2014-10-27 trunk 48168) [x86_64-linux] ``` ---Files-------------------------------- ripper-block_dup_check-10436.patch (2.2 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52058] [Ruby master Bug#8445] IO.open and IO#set_enconding does not support :fallback option
by JesseJohnson (Jesse Johnson) 13 Nov '23

13 Nov '23

Issue #8445 has been updated by JesseJohnson (Jesse Johnson). I can replicate this in 3.2.2. ---------------------------------------- Bug #8445: IO.open and IO#set_enconding does not support :fallback option https://bugs.ruby-lang.org/issues/8445#change-105299 * Author: pjmtdw (Haruhiro Yoshimoto) * Status: Assigned * Priority: Normal * Assignee: akr (Akira Tanaka) * ruby -v: trunk(ruby 2.1.0dev) ---------------------------------------- RubyDoc says that `IO.open` and `IO#set_encoding` supports optional argument defined in `String#encode`. http://ruby-doc.org/core-2.0/IO.html#method-c-new-label-Options In fact, `:invalid, :undef and :replace` works as expected. However, `:fallback` option does not work neither for `IO.open` and `IO#set_encoding`. Following is the example code which does not work. `f(x)` is never called even if hoge.txt contains non convertible character. ```ruby File.open("./hoge.txt","r:Shift_JIS:utf-8", :fallback => lambda{|x|f(x)}){|f| ... } File.open("./hoge.txt"){|f| f.set_encoding("Shift_JIS","utf-8",:fallback => lambda{|x|f(x)}) ... } ``` I Think this is because `fill_cbuf()` in `io.c` calls `rb_econv_convert()` from `transcode.c` directly. On the other hand, `fallback_func` is called in `transcode_loop()`, which is called by `str_encode()`. Since `transcode_loop()` also calls `rb_econv_convert()`, I wrote a small patch which moves some codes from `transcode_loop()` to `rb_econv_convert()` to fix the problem. The attached file is the patch. Hope this helps. ---Files-------------------------------- support-fallback-for-io.patch (3.9 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52057] [Ruby master Bug#6351] transcode table generator does not support multi characters of Unicode
by JesseJohnson (Jesse Johnson) 13 Nov '23

13 Nov '23

Issue #6351 has been updated by JesseJohnson (Jesse Johnson). @duerst Is this still an issue? If so, is there a test case? ---------------------------------------- Bug #6351: transcode table generator does not support multi characters of Unicode https://bugs.ruby-lang.org/issues/6351#change-105291 * Author: usa (Usaku NAKAMURA) * Status: Assigned * Priority: Normal * Assignee: duerst (Martin Dürst) * ruby -v: ruby 2.0.0dev (2012-04-24 trunk 35457) * Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN ---------------------------------------- 改めてチケット起こします。[ruby-dev:45576] より。 On 2012/04/24 17:11, "Martin J. Dürst" wrote: > On 2012/04/24 17:02, U.Nakamura wrote: > >> データは例によってNetBSDのものが利用できそうです。 >> なのですが、transcodeってUnicodeの第0面(BMP)以外はサポートし >> てましたっけ? > > もちろんです :-) もうちょっと調べました。BMP 以外は transcode の最初から全く問題ないですが、現時点で引っかかるのは次のものです (http://x0213.org/codetable/euc-jis-2004-std.txt から抜粋): 0xA4F7 U+304B+309A # [2000] 0xA4F8 U+304D+309A # [2000] 0xA4F9 U+304F+309A # [2000] 0xA4FA U+3051+309A # [2000] 0xA4FB U+3053+309A # [2000] 0xA5F7 U+30AB+309A # [2000] 0xA5F8 U+30AD+309A # [2000] 0xA5F9 U+30AF+309A # [2000] 0xA5FA U+30B1+309A # [2000] 0xA5FB U+30B3+309A # [2000] 0xA5FC U+30BB+309A # [2000] 0xA5FD U+30C4+309A # [2000] 0xA5FE U+30C8+309A # [2000] 0xA6F8 U+31F7+309A # [2000] 0xABC4 U+00E6+0300 # [2000] 0xABC8 U+0254+0300 # [2000] 0xABC9 U+0254+0301 # [2000] 0xABCA U+028C+0300 # [2000] 0xABCB U+028C+0301 # [2000] 0xABCC U+0259+0300 # [2000] 0xABCD U+0259+0301 # [2000] 0xABCE U+025A+0300 # [2000] 0xABCF U+025A+0301 # [2000] 0xABE5 U+02E9+02E5 # [2000] 0xABE6 U+02E5+02E9 # [2000] ようするに、JIS X 0213 で一文字になっているが、Unicode で二文字になっているものです。EUC-JISX0213 から UTF-8 は問題ないですが、逆は現在引っかかります。windows-1258 も (逆ですが) 同じ問題がありますので、いずれはなくさないといけないと思いましたが、今回はいいきっかけのではないかと思います。よろしくお願いします。 Martin. -- https://bugs.ruby-lang.org/

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[ruby-dev:52056] [Ruby master Bug#19537] Regexp caching algorithm since v3.2.0 causes invalid memory access
by jeremyevans0 (Jeremy Evans) 25 Oct '23

25 Oct '23

Issue #19537 has been updated by jeremyevans0 (Jeremy Evans). Status changed from Open to Closed Fixed in commit:a1c2c274eebcc2a5275b677ebf94a8dbff380770 ---------------------------------------- Bug #19537: Regexp caching algorithm since v3.2.0 causes invalid memory access https://bugs.ruby-lang.org/issues/19537#change-105083 * Author: jj1uzh (Futa Miyachi) * Status: Closed * Priority: Normal * Assignee: make_now_just (Hiroya Fujinami) * ruby -v: ruby 3.3.0dev (2023-03-17T09:50:55Z master c65d7b4bea) [x86_64-linux] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- Some types of regular expressions causes invalid memory access on `#match`. Length of strings to match does not matter. For example, for regex `/^([ab]{1,3})(a?)*$/`, `"aac"` can crash ruby. This bug may be caused in caching algorithm since v3.2.0. v3.1.3 is safe as far as I checked. Environments: Linux 6.2.6-arch1-1 x86-64, 16GB RAM Reproduce Process: ``` $> ruby -e 'p /^([ab]{1,3})(a?)*$/.match "aac"' -e:1: [BUG] Segmentation fault at 0x0000560315993d90 ruby 3.3.0dev (2023-03-17T09:50:55Z master c65d7b4bea) [x86_64-linux] ... ``` Whole output is attached as output.txt. Note that result may be `nil` correctly sometimes. Part of backtrace: ``` #5 0x000055ff30b71ecb in sigsegv (sig=11, info=0x55ff31bd0e70, ctx=0x55ff31bd0d40) at ../signal.c:964 #6 <signal handler called> #7 reset_match_cache (num_cache_table=<optimized out>, num_cache_size=3, table=0x55ff31e2d930, match_cache=0x55ff31e2aec0 "\300\f", pos=2, pend=<optimized out>, pbegin=0x55ff31dc7202 ">\030", reg=0x55ff31e199b0) at ../regexec.c:1292 #8 match_at (reg=reg@entry=0x55ff31e199b0, str=str@entry=0x7fb176c7f148 "aac", end=<optimized out>, end@entry=0x7fb176c7f14b "", sstart=sstart@entry=0x7fb176c7f148 "aac", sprev=<optimized out>, msa=msa@entry=0x7ffe40153d30) at ../regexec.c:3486 ``` ---Files-------------------------------- output.txt (17.4 KB) ruby-19537.patch (1.77 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52055] There is an overdue payment under your name. Please, settle your debts ASAP.
by ruby-dev＠ruby-lang.org 16 Oct '23

16 Oct '23

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I have specified my Bitcoin wallet with spaces, please make sure that you key-in my bitcoin address without spaces to be sure that your coins successfully reach my wallet! From now on, you have only 48 hours and countdown has started once you opened this very email (in other words, 2 days). The following list contains things you should definitely abstain from doing or even attempting: ~>> Abstain from trying to reply this email (since the email is generated inside your inbox alongside with return address). ~>> Abstain from trying to call or report to police or any other security services. In addition, it's a bad idea if you want to share it with your friends, hoping they would help. 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Here you need to trust me, because there is absolutely no point to still bother you after receiving money. Moreover, if I really wanted all those videos would be available to public long time ago! I believe we can still handle this situation on fair terms! Here is my last advice to you... in future you better ensure you stay away from this kind of situations! My advice - don't forget to regularly update your passwords to feel completely secure.

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[ruby-dev:52054] [Ruby master Feature#18573] Object#pack1
by mame (Yusuke Endoh) 13 Oct '23

13 Oct '23

Issue #18573 has been updated by mame (Yusuke Endoh). If we introduce a new method for this, I think it would be better to design a more descriptive API instead of reusing a hacky pack format directive, such as `0x1234.to_binary_string(4, endian: :big) #=> "\x00\x00\x12\x34"`. ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104913 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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[ruby-dev:52053] [Ruby master Feature#18573] Object#pack1
by tenderlovemaking (Aaron Patterson) 12 Oct '23

12 Oct '23

Issue #18573 has been updated by tenderlovemaking (Aaron Patterson). matz (Yukihiro Matsumoto) wrote in #note-7: > Array.pack1 is unlikely because there is no connection between the responsibilities of the method and the Array class. I also disagree with String.pack1 for the same reason. > The most natural candidate is Object#pack1, but I question the need to pollute the namespace for this trivial method. > > Matz. Feature #18897 introduced a specialized instruction for Array#hash, but it created a new instruction called `opt_newarray_send`. I think we could leverage that instruction for the case of an array literal + pack. That would avoid the array creation. I will try to make a patch. ---------------------------------------- Feature #18573: Object#pack1 https://bugs.ruby-lang.org/issues/18573#change-104894 * Author: os (Shigeki OHARA) * Status: Open * Priority: Normal ---------------------------------------- # 概要 String#unpack1 の逆の Object#pack1 が欲しい。 # 背景 Array#pack というメソッドがありますが、レシーバーの Array の要素数が 1 つしかないことが良くあります。 ``` ruby [codepoint].pack('U') [digest].pack('m0') [mail_body].pack('M') [ip_address].pack('N') ``` 標準添付ライブラリーなどを眺めてみてもチラホラあるようです。ですが、このようなケースで変換対象のオブジェクトをわざわざ Array でくるまなくてはいけないというのは面倒な気もします。 # 提案 String#unpack に対して String#unpack1 というメソッドがありますが、 Array#pack に対する Object#pack1 というメソッドを提案します。イメージとしては以下のコードのような感じです。 ``` ruby class Object def pack1(template, option = {}) [self].pack(template, **option) end end ``` # 議論・課題 * Object で良いかどうかは議論の余地があろうかと思います * メソッド名が pack1 で良いかはわかりませんが、他とかぶる可能性は低いかと思います -- https://bugs.ruby-lang.org/

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