Backport #8966: SEGV when a refined method is undefined by undef

• Status: Closed
• Assignee: nagachika (Tomoyuki Chikanaga)

[shugo (Shugo Maeda)]

=begin
The following code causes SEGV:

module Foo
refine Object do
def foo
puts "foo"
end
end
end

using Foo

class Object
undef foo
end

foo

I guess undef is not aware of refinements.
=end

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)

=begin
What should happen in that case?
Printing (({"foo"})), or raising a (({NameError}))?
=end

[shugo (Shugo Maeda)]

nobu (Nobuyoshi Nakada) wrote:

What should happen in that case?
Printing (({"foo"})), or raising a (({NameError}))?

`undef foo' should raise a NameError because foo is not defined in the original class.

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Assigned to Closed
• Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN to 1.9.3: UNKNOWN, 2.0.0: REQUIRED

committed at r43090.
And it should be backported to ruby_2_0_0.

[nagachika (Tomoyuki Chikanaga)]

• Tracker changed from Bug to Backport
• Project changed from Ruby master to Backport200
• Category deleted (core)
• Status changed from Closed to Assigned
• Assignee changed from shugo (Shugo Maeda) to nagachika (Tomoyuki Chikanaga)
• Target version deleted (2.1.0)

[shugo (Shugo Maeda)]

nagachika (Tomoyuki Chikanaga) wrote:

committed at r43090.
And it should be backported to ruby_2_0_0.

Ah, I forgot to add the bug number to the commit log of r43090. Thanks.

[nagachika (Tomoyuki Chikanaga)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r43143.
Shugo, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

merge revision(s) 43090,43091: [Backport #8966]

* vm_method.c (rb_undef): raise a NameError if the original method
  of a refined method is not defined. 

* vm_insnhelper.c (rb_method_entry_eq): added NULL check to avoid SEGV.

* test/ruby/test_refinement.rb: related test.
  of a refined method is not defined.