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August 13, 2010
Infinite loop in compiler with forward reference
Compiling the following with latest DMD D2 sends the compiler into an
infinite loop.  The culprit line seems to be the alias definition.
Can someone else please confirm.
Thanks Justin




module test;


class Base
{
   Base foo();
}

class Foo: Base
{
   static class Bar: Foo
   {
      Bar foo() {
         return this;
      }
   }

   Bar foo();
}

alias Foo.Bar FooBar;


void main()
{
}



test.d(10): Error: class test.Foo is forward referenced when looking for 
'eVr'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'eWr'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'eXr'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'eYr'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'eZr'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e0r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e1r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e2r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e3r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e4r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e5r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e6r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e7r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e8r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e9r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'e_r'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'eaar'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'ebar'
test.d(10): Error: class test.Foo is forward referenced when looking for 
'ecar'
....
August 13, 2010
Re: Infinite loop in compiler with forward reference
Yup, infinite loop.

On Sat, Aug 14, 2010 at 1:39 AM, Justin Johansson <no@spam.com> wrote:

> Compiling the following with latest DMD D2 sends the compiler into an
> infinite loop.  The culprit line seems to be the alias definition.
> Can someone else please confirm.
> Thanks Justin
>
>
>
>
> module test;
>
>
> class Base
> {
>   Base foo();
> }
>
> class Foo: Base
> {
>   static class Bar: Foo
>   {
>      Bar foo() {
>         return this;
>      }
>   }
>
>   Bar foo();
> }
>
> alias Foo.Bar FooBar;
>
>
> void main()
> {
> }
>
>
>
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'eVr'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'eWr'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'eXr'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'eYr'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'eZr'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e0r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e1r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e2r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e3r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e4r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e5r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e6r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e7r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e8r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e9r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'e_r'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'eaar'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'ebar'
> test.d(10): Error: class test.Foo is forward referenced when looking for
> 'ecar'
> ....
>
August 14, 2010
Re: Infinite loop in compiler with forward reference
== Quote from Andrej Mitrovic (andrej.mitrovich@gmail.com)'s article
> --000e0cd5ccdc83f72e048dbd3172
> Content-Type: text/plain; charset=ISO-8859-1
> Yup, infinite loop.
> On Sat, Aug 14, 2010 at 1:39 AM, Justin Johansson <no@spam.com> wrote:
> > Compiling the following with latest DMD D2 sends the compiler into an
> > infinite loop.  The culprit line seems to be the alias definition.
> > Can someone else please confirm.
> > Thanks Justin
> >

Not with GDC, but that may not be important.

$ gdc --version
gdc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ gdc test.d
/tmp/ccubltma.o:test.d:(.rdata+0x28): undefined reference to `__D4test4Base3fooF
ZC4test4Base'
/tmp/ccubltma.o:test.d:(.rdata+0x78): undefined reference to `__D4test3Foo3fooFZ
C4test3Foo3Bar'
collect2: ld returned 1 exit status

$
August 14, 2010
Re: Infinite loop in compiler with forward reference
On Friday 13 August 2010 20:01:40 Era Scarecrow wrote:
> == Quote from Andrej Mitrovic (andrej.mitrovich@gmail.com)'s article
> 
> > --000e0cd5ccdc83f72e048dbd3172
> > Content-Type: text/plain; charset=ISO-8859-1
> > Yup, infinite loop.
> > 
> > On Sat, Aug 14, 2010 at 1:39 AM, Justin Johansson <no@spam.com> wrote:
> > > Compiling the following with latest DMD D2 sends the compiler into an
> > > infinite loop.  The culprit line seems to be the alias definition.
> > > Can someone else please confirm.
> > > Thanks Justin
> 
>  Not with GDC, but that may not be important.

Well, it's a bug. Regardless of how well gdc follows the D2 spec (and from what 
I understand, it's a fair bit behind at this point), both dmd and gdc are going 
to have bugs, and those bugs are going to be different. So, the fact that 
something works or not with dmd doesn't say much about whether it works with gdc 
(or vice versa) unless you're talking about language spec issues. Bugs are 
naturally going to differ between the two.

- Jonathan M davis
August 14, 2010
Re: Infinite loop in compiler with forward reference
dmd 0.125? Isn't that ancient? :)

On Sat, Aug 14, 2010 at 5:01 AM, Era Scarecrow <rtcvb32@yahoo.com> wrote:

> == Quote from Andrej Mitrovic (andrej.mitrovich@gmail.com)'s article
> > --000e0cd5ccdc83f72e048dbd3172
> > Content-Type: text/plain; charset=ISO-8859-1
> > Yup, infinite loop.
> > On Sat, Aug 14, 2010 at 1:39 AM, Justin Johansson <no@spam.com> wrote:
> > > Compiling the following with latest DMD D2 sends the compiler into an
> > > infinite loop.  The culprit line seems to be the alias definition.
> > > Can someone else please confirm.
> > > Thanks Justin
> > >
>
>  Not with GDC, but that may not be important.
>
> $ gdc --version
> gdc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
> Copyright (C) 2004 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> $ gdc test.d
> /tmp/ccubltma.o:test.d:(.rdata+0x28): undefined reference to
> `__D4test4Base3fooF
> ZC4test4Base'
> /tmp/ccubltma.o:test.d:(.rdata+0x78): undefined reference to
> `__D4test3Foo3fooFZ
> C4test3Foo3Bar'
> collect2: ld returned 1 exit status
>
> $
>
August 14, 2010
Re: Infinite loop in compiler with forward reference
Era Scarecrow, el 14 de agosto a las 03:01 me escribiste:
> == Quote from Andrej Mitrovic (andrej.mitrovich@gmail.com)'s article
> > --000e0cd5ccdc83f72e048dbd3172
> > Content-Type: text/plain; charset=ISO-8859-1
> > Yup, infinite loop.
> > On Sat, Aug 14, 2010 at 1:39 AM, Justin Johansson <no@spam.com> wrote:
> > > Compiling the following with latest DMD D2 sends the compiler into an
> > > infinite loop.  The culprit line seems to be the alias definition.
> > > Can someone else please confirm.
> > > Thanks Justin
> > >
> 
>  Not with GDC, but that may not be important.
> 
> $ gdc --version
> gdc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^

Note that you're using an ancient compiler.

-- 
Leandro Lucarella (AKA luca)                     http://llucax.com.ar/
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