May 2025 - ruby-core - ml.ruby-lang.org

[ruby-core:121792] [Ruby Misc#21299] Proposal: Remove Continuation Feature from Ruby Core
by ianks (Ian Ker-Seymer) 01 May '25

01 May '25

Issue #21299 has been reported by ianks (Ian Ker-Seymer). ---------------------------------------- Misc #21299: Proposal: Remove Continuation Feature from Ruby Core https://bugs.ruby-lang.org/issues/21299 * Author: ianks (Ian Ker-Seymer) * Status: Open * Assignee: ioquatix (Samuel Williams) ---------------------------------------- Continuations have been obsolete since Ruby 2.2 but still add complexity to the core codebase. I propose removing all continuation support from Ruby Core. ### Reasons #### Simplifies fiber code - Current fiber code in `cont.c` is complicated by shared logic with continuations - Removing continuations will simplify stack management, context switching, and reduce edge cases - Ultimately leading to: cleaner code, easier maintenance, possible performance improvements #### Low compatibility risk - Major libraries (e.g., [Metasploit](https://github.com/rapid7/metasploit-framework/pull/2413)) stopped using continuation years ago - Projects needing this functionality have found workarounds (e.g., hyperion_http simulates `callcc`) - [TruffleRuby does not support continuations](https://github.com/oracle/truffleruby/blob/ac88a0fe68bf957f7…, yet maintains high compatibility ### Proposed steps 1. Remove the continuation gem from default gems. 2. Delete all continuation-specific code in `cont.c`. 3. Add a stub gem that raises an exception if continuations are used. 4. Optionally document alternative approaches for users who still need this feature. -- https://bugs.ruby-lang.org/

2 2

[ruby-core:121778] [Ruby Bug#21296] The builds of `RUBY_DEBUG` and `VM_CHECK_MODE` are broken
by hsbt (Hiroshi SHIBATA) 01 May '25

01 May '25

Issue #21296 has been reported by hsbt (Hiroshi SHIBATA). ---------------------------------------- Bug #21296: The builds of `RUBY_DEBUG` and `VM_CHECK_MODE` are broken https://bugs.ruby-lang.org/issues/21296 * Author: hsbt (Hiroshi SHIBATA) * Status: Open * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- `RUBY_DEBUG` and `VM_CHECK_MODE` are broken from 4-5 days ago. * https://github.com/ruby/ruby/actions/runs/14731314851/job/41346072323?pr=13… * https://github.com/ruby/ruby/actions/runs/14731314851/job/41346071897?pr=13… ``` /github/workspace/src/vm_core.h:1990: Assertion Failed: rb_current_execution_context:ec == rb_current_ec_noinline() ruby 3.5.0dev (2025-04-29T12:32:24Z pull/13200/merge 22fe2a6945) +PRISM [x86_64-linux] ``` I'm not sure what's root cause for that. But omnibus compilations 8 and 9 are broken since merging https://github.com/ruby/ruby/pull/13080. You can track that results from https://github.com/ruby/ruby/actions/workflows/compilers.yml -- https://bugs.ruby-lang.org/

2 2

[ruby-core:121769] [Ruby Bug#21293] C23/GCC 15 build breakage with rb_define_method() and friends
by alanwu (Alan Wu) 01 May '25

01 May '25

Issue #21293 has been reported by alanwu (Alan Wu). ---------------------------------------- Bug #21293: C23/GCC 15 build breakage with rb_define_method() and friends https://bugs.ruby-lang.org/issues/21293 * Author: alanwu (Alan Wu) * Status: Open * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- GCC 15 defaults to `-std=gnu23`, which breaks rb_define_method() in some corner cases: ```diff diff --git a/object.c b/object.c index 5a379e9..958f421 100644 --- a/object.c +++ b/object.c @@ -4613,7 +4613,8 @@ InitVM_Object(void) rb_cFalseClass = rb_define_class("FalseClass", rb_cObject); rb_cFalseClass_to_s = rb_fstring_enc_lit("false", rb_usascii_encoding()); rb_vm_register_global_object(rb_cFalseClass_to_s); - rb_define_method(rb_cFalseClass, "to_s", rb_false_to_s, 0); + int zero = 0; + rb_define_method(rb_cFalseClass, "to_s", rb_false_to_s, zero); rb_define_alias(rb_cFalseClass, "inspect", "to_s"); rb_define_method(rb_cFalseClass, "&", false_and, 1); rb_define_method(rb_cFalseClass, "|", false_or, 1); ``` Applying the above is fine prior to C23, but on GCC 15 it triggers a build error: ```text compiling object.c In file included from ./include/ruby/ruby.h:27, from constant.h:13, from object.c:22: object.c: In function 'InitVM_Object': ./include/ruby/internal/anyargs.h:288:135: error: passing argument 3 of 'rb_define_method_m3' from incompatible pointer type [-Wincompatible-pointer-types] 288 | #define rb_define_method(klass, mid, func, arity) RBIMPL_ANYARGS_DISPATCH_rb_define_method((arity), (func))((klass), (mid), (func), (arity)) | ^~~~~~ | | | VALUE (*)(VALUE) {aka long unsigned int (*)(long unsigned int)} object.c:4617:5: note: in expansion of macro 'rb_define_method' 4617 | rb_define_method(rb_cFalseClass, "to_s", rb_false_to_s, kek); | ^~~~~~~~~~~~~~~~ ./include/ruby/internal/anyargs.h:277:21: note: expected 'VALUE (*)(void)' {aka 'long unsigned int (*)(void)'} but argument is of type 'VALUE (*)(VALUE)' {aka 'long unsigned int (*)(long unsigned int)'} 277 | RBIMPL_ANYARGS_DECL(rb_define_method, VALUE, const char *) | ^~~~~~~~~~~~~~~~ ./include/ruby/internal/anyargs.h:252:41: note: in definition of macro 'RBIMPL_ANYARGS_DECL' 252 | RBIMPL_ANYARGS_ATTRSET(sym) static void sym ## _m3(__VA_ARGS__, VALUE(*)(ANYARGS), int); \ | ^~~ object.c:1605:1: note: 'rb_false_to_s' declared here 1605 | rb_false_to_s(VALUE obj) | ^~~~~~~~~~~~~ At top level: cc1: note: unrecognized command-line option '-Wno-self-assign' may have been intended to silence earlier diagnostics cc1: note: unrecognized command-line option '-Wno-parentheses-equality' may have been intended to silence earlier diagnostics cc1: note: unrecognized command-line option '-Wno-constant-logical-operand' may have been intended to silence earlier diagnostics make: *** [Makefile:464: object.o] Error 1 ``` This also happens for C method that takes a large number of arguments. This because in C23 `void foo();` no longers means "foo takes an unspecified number of arguments" anymore, and there is no way to implement a working `ANYARGS` AFAIK. Not something people would run into in practice, I hope. (related: #21286 but this one is not Windows specific) -- https://bugs.ruby-lang.org/

2 1