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iseq_collector gem
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README.md

IseqCollector

This gem introduce several methdos to ObjectSpace to operate all of iseq objects in a process.

Background

Ruby (MRI) 2.2 and erlier, all of bytecode (iseq: instruction sequence) are RubyVM::InstructionSequence objects and we can touch them with ObjectSpace.each_object method. However Ruby 2.3 and later does not expose iseqs by RubyVM::InstructionSequence. You need to use RubyVM::InstructionSequence.of(proc or method object) to get RubyVM::InstructionSequence and it is impossible to get all of iseqs in a process.

This gem provides ObjectSpace.each_iseq, ObjectSpace.count_iseq and ObjectSpace.memsize_of_all_iseq to get all of iseqs in a process for Ruby 2.3 and later. Future Ruby version can provide same purpose API, but not sure.

Installation

Add this line to your application's Gemfile:

gem 'iseq_collector'

And then execute:

$ bundle

Or install it yourself as:

$ gem install iseq_collector

Usage

require 'iseq_collector' adds the following singleton methods to ObjectSpace module.

  • ObjectSpace.each_iseq{|iseq| ...}
  • ObjectSpace.count_iseq #=> Integer
  • ObjectSpace.memsize_of_all_iseq #=> Integer (this feature can be implemented by ObjectSpace.each_iseq)

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/iseq_collector.

License

The gem is available as open source under the terms of the MIT License.

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