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Bug #16788

closed

T_CLASS counts classes double

Added by ana06 (Ana Maria Martinez Gomez) over 1 year ago. Updated over 1 year ago.

Status:
Rejected
Priority:
Normal
Assignee:
-
Target version:
-
ruby -v:
1.9 to master
[ruby-core:97896]

Description

Consider the following code:

h = {}
ObjectSpace.count_objects(h)
puts "Counts: #{ h[:T_CLASS] }, #{ h[:T_ICLASS] }"

objects = []
classes = []
ObjectSpace.each_object(Object){|x| objects << x}
ObjectSpace.each_object(Class){|x| classes << x}

class Test
end

objects2 = []
classes2 = []
ObjectSpace.each_object(Object){|x| objects2 << x}
ObjectSpace.each_object(Class){|x| classes2 << x}

objects_ids = objects.map(&:object_id)
new_objects = objects2.reject { |e| objects_ids.include? e.object_id }

puts "New objects belongs to the classes: #{ new_objects.map(&:class).uniq }"
puts "New classes: #{classes2 - classes}"

h = {}
ObjectSpace.count_objects(h)
puts "Counts: #{ h[:T_CLASS] }, #{ h[:T_ICLASS] }"

The result is the following:

Counts: 690, 46
New objects belongs to the classes: [Array, Class]
New classes: [Test]
Counts: 692, 46

This means that the number of T_CLASS is increased by 2 with the creation of 1 class. Why is this the case? Is this a bug?

Consider the slightly modified code with:

class Test
  def self.foo 
  end
end

In this case the Singleton class is also created and the results are:

Counts: 690, 46
New objects belongs to the classes: [Array, Class]
New classes: [#<Class:Test>, Test]
Counts: 693, 46

In this case, T_CLASS is increased by 3. So it seems like the issue is only with normal classes and not singleton ones.

From https://stackoverflow.com/questions/61031735

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