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Shugo MaedaandClaude Fable 5
79d4e720f8
Audit of every EC_PUSH_TAG user, following the LLVM 19 longjmp
rematerialization bug worked around in rb_fiber_start: locals and
arguments that are read on the longjmp path but not modified inside
the tag region are made volatile. C99 7.13.2.1p3 guarantees such
unmodified locals, but LLVM 17 and 19 have been observed to
reconstruct their values incorrectly after a longjmp (cfp in
rb_iterate0, fiber in rb_fiber_start). volatile on a parameter may
not be effective (67d0f4821f,
https://bugs.ruby-lang.org/issues/19145), so arguments are copied
into volatile locals instead.
* vm_eval.c (rb_iterate0): cfp is compared against the escaping
frame after a longjmp; clang 17 at -O1 with -fPIC was observed to
clobber it during the development of the ifunc invalidation for
https://bugs.ruby-lang.org/issues/22019. ec is read next to it to
rewind the frame and to rethrow.
* eval_error.c (rb_ec_error_print_detailed0): opt and highlight are
read on the path reached by a longjmp from rb_get_backtrace while
the other locals of the function are already volatile.
* scheduler.c (rb_fiber_scheduler_unblock, fiber_interrupt): ec and
saved_interrupt_mask are read after a longjmp to restore
ec->interrupt_mask; cfp next to them was already volatile.
* eval.c (rb_vrescue2): r_proc and data2 are used when the raise is
handled. args is left as is; a va_list cannot portably be
volatile-qualified and is memory-backed in practice.
* eval.c (rb_protect): pstate is written through after the tag is
popped.
* eval.c (rb_ec_ensure): ec, e_proc and data2 run the ensure proc
after a longjmp; a clobbered e_proc would miscall it.
* vm_eval.c (vm_catch_protect): stateptr is written through after
the pop. tag has its address taken and stays in memory.
* vm_trace.c (exec_hooks_protected): ec and list are passed to
exec_hooks_postcheck after the pop.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
What is Ruby?
Ruby is an interpreted object-oriented programming language often used for web development. It also offers many scripting features to process plain text and serialized files, or manage system tasks. It is simple, straightforward, and extensible.
Features of Ruby
- Simple Syntax
- Normal Object-oriented Features (e.g. class, method calls)
- Advanced Object-oriented Features (e.g. mix-in, singleton-method)
- Operator Overloading
- Exception Handling
- Iterators and Closures
- Garbage Collection
- Dynamic Loading of Object Files (on some architectures)
- Highly Portable (works on many Unix-like/POSIX compatible platforms as well as Windows, macOS, etc.) cf. https://docs.ruby-lang.org/en/master/maintainers_md.html#label-Platform+Maintainers
How to get Ruby
For a complete list of ways to install Ruby, including using third-party tools like rvm, see:
https://www.ruby-lang.org/en/downloads/
You can download release packages and the snapshot of the repository. If you want to download whole versions of Ruby, please visit https://www.ruby-lang.org/en/downloads/releases/.
Download with Git
The mirror of the Ruby source tree can be checked out with the following command:
$ git clone https://github.com/ruby/ruby.git
There are some other branches under development. Try the following command to see the list of branches:
$ git ls-remote https://github.com/ruby/ruby.git
You may also want to use https://git.ruby-lang.org/ruby.git (actual master of Ruby source) if you are a committer.
How to build
See Building Ruby
Ruby home page
Documentation
Mailing list
There is a mailing list to discuss Ruby. To subscribe to this list, please send the following phrase:
join
in the mail subject (not body) to the address ruby-talk-request@ml.ruby-lang.org.
Copying
See the file COPYING.
Feedback
Questions about the Ruby language can be asked on the Ruby-Talk mailing list or on websites like https://stackoverflow.com.
Bugs should be reported at https://bugs.ruby-lang.org. Read "Reporting Issues" for more information.
Contributing
See "Contributing to Ruby", which includes setup and build instructions.
The Author
Ruby was originally designed and developed by Yukihiro Matsumoto (Matz) in 1995.