From: "tenderlovemaking (Aaron Patterson)" <noreply@...>
Date: 2022-06-16T22:30:36+00:00
Subject: [ruby-core:108968] [Ruby master Feature#18835] Add InstructionSequence#type method

Issue #18835 has been reported by tenderlovemaking (Aaron Patterson).

----------------------------------------
Feature #18835: Add InstructionSequence#type method
https://bugs.ruby-lang.org/issues/18835

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
This method returns a symbol representing the type of the instruction
sequence object.

I'm trying to collect some statistics about instruction sequences for an entire system, but I mostly care about methods and blocks. This feature lets me select only methods and blocks to analyze.

I am using a script like this:

```ruby
def walk iseq
  case iseq.type
  when :METHOD, :BLOCK
    count = 0
    sends = 0
    iseq.to_a.last.each do |insn|
      count += 1 if insn.is_a?(Array)

      case insn
      in [:opt_send_without_block, _]
        sends += 1
      in [:send, _]
        sends += 1
      in [:invokeblock]
        sends += 1
      else
      end
    end
    p [count, sends]
  end
  iseq.each_child { |n| walk(n) }
end

iseq = RubyVM::InstructionSequence.compile_file(ARGV[0])
walk iseq
```


Then in my shell I can do this:

```
$ find ~/git/rails/activerecord/lib -name '*.rb' -exec ./miniruby test.rb {} \;
```

I'm able to calculate instructions per method as well as number of "sends" per iseq. (Of course this isn't 100% accurate because of metaprogramming etc, but I think it lets us get good estimates)

I made a pull request [here](https://github.com/ruby/ruby/pull/5809) and I've attached a patch as well.

---Files--------------------------------
0001-Add-InstructionSequence-type-method.patch (2.16 KB)


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