From: "hsbt (Hiroshi SHIBATA)" <noreply@...>
Date: 2021-11-24T05:06:20+00:00
Subject: [ruby-core:106238] [Ruby master Feature#17863] rewrite lib/debug.rb with latest API

Issue #17863 has been updated by hsbt (Hiroshi SHIBATA).

Assignee set to ko1 (Koichi Sasada)
Status changed from Open to Closed

debug.rb was replaced debug gem at https://github.com/ruby/ruby/pull/4804

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Feature #17863: rewrite lib/debug.rb with latest API
https://bugs.ruby-lang.org/issues/17863#change-94858

* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
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I rewrite lib/debug.rb (called old debug.rb) with recent TracePoint APIs (called new debug.rb).

It has several incompatibility but maybe nobody uses lib/debug.rb so there is no compatible issues. In fact I tried several features of lib/debug.rb and it doesn't work nowaday.

You can see the doc on https://github.com/ruby/debug

Compare with existing other debuggers, it has several advantages:

* Fast: No performance penalty on non-stepping mode and non-breakpoints.
* Remote debugging: Support remote debugging natively.
  * UNIX domain socket
  * TCP/IP
  * VSCode/DAP integration (TODO)
* Extensible: application can introduce debugging support with several methods
  * By `rdbg` command
  * By loading libraries with `-r` command line option
  * By calling Ruby's method explicitly
* Misc
  * Support threads (almost done) and ractors (TODO).
  * Support suspending and entering to the console debugging with `Ctrl-C` at most of timing.
  * Show parameters on backtrace command.

And do not need to write it on Gemfile because it will be a default gem from Ruby 3.1.

Important differences:

* `require 'debug'` is only a way to enable old debug.rb, but new debug.rb can be enabled with:
  * require
  * `rdbg` command (like bybug)
  * `binding.bp` method like `binding.irb`
* Support remote debugging
* Support several options like non-stop mode and so on
* old debug.rb evaluate unrecognized command as Ruby script, but new debug.rb doesn't allow this spec.
  * `obj.foo` will be evaluated as Ruby script on old debug.rb (and byebug)
  * new debug.rb shows `unknown command` because it is typo safe and extension safe.
  * To see the result, you need to use `p` command like `p obj.foo`.

Now you can try on 2.6-master with `gem install debug --pre`.





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