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Rational() and IO.try_convert do not work for BasicObjects #4484

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janlelis opened this issue Feb 7, 2017 · 3 comments
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Rational() and IO.try_convert do not work for BasicObjects #4484

janlelis opened this issue Feb 7, 2017 · 3 comments

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@janlelis
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@janlelis janlelis commented Feb 7, 2017

Environment

  • ruby -v jruby 9.1.8.0-SNAPSHOT (2.3.1) 2017-02-06 3f97c7a Java HotSpot(TM) 64-Bit Server VM 25.111-b14 on 1.8.0_111-b14 +indy +jit [linux-x86_64]
  • uname -a Linux ok 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Test Case

o = BasicObject.new

begin
  p IO.try_convert(o)
rescue
  p $!
end

begin
  p Rational(o)
rescue
  p $!
end

Expected Behavior

  • MRI returns nil for the try_convert case, and raises a TypeError for Rational(). If conversion would be possible (to_io or to_r exist), it would properly convert
nil
#<TypeError: can't convert BasicObject into Rational>

Actual Behavior

  • JRuby always raises NoMethodErrors (no matter if to_io or to_r exist):
#<NoMethodError: undefined method `respond_to?' for #<BasicObject:0x6ec8211c>>
#<NoMethodError: undefined method `respond_to?' for #<BasicObject:0x6ec8211c>>
@enebo enebo added this to the JRuby 9.1.8.0 milestone Feb 9, 2017
@headius
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@headius headius commented Feb 9, 2017

I would guess our ported logic for type these type conversions just needs some updating.

try_convert appears to use a RespondToCallSite, which I would have expected to do the right thing if there's no respond_to? defined. There may be some missing or incorrect logic in there for checking the presence of respond_to?.

Rational() calls convert on Rational, which eventually tries to call our Java-level respondsTo on the BasicObject, which blindly tries to call respond_to?. It should use a RespondToCallSite as well.

I think @juliancheal is going to take a poke at this.

@headius
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@headius headius commented Feb 9, 2017

Oops, I had the wrong bug for @juliancheal...we asked him to look at #4483. However the two bugs are rather similar.

kares added a commit to kares/jruby that referenced this issue Feb 17, 2017
... also added a caching respond_to? call-site (see jruby#4484)
kares added a commit to kares/jruby that referenced this issue Feb 19, 2017
kares added a commit that referenced this issue Feb 19, 2017
... also added a caching respond_to? call-site (see #4484)
@kares
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@kares kares commented Feb 19, 2017

... adding an instanceof RubyObject check (in both places) resolved the compatibility issue

@kares kares closed this Feb 19, 2017
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