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digitalmars.D.bugs - [Issue 3170] New: Forward reference bugs

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           Summary: Forward reference bugs
           Product: D
           Version: 2.031
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: tim.matthews7 gmail.com


Created an attachment (id=422)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=422)
Reproducible A

In order for the dnet (D dot net compiler based on dmd front end) to work,
import files for the dot net declarations must be generated. Currently the
import files cannot be parsed and the error thrown is:

Error: class System.Windows.Forms.ToolStripItem is forward referenced when
looking for 'ToolStripItemAccessibleObject'

I have reduced this down to 2 separate reproducible cases (see attached).
Having both of these fixed will make .net interoperability via dnet compiler
more achievable and help D generally drop forward reference issues that C++ is
prone too.

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Created an attachment (id=423)
 --> (http://d.puremagic.com/issues/attachment.cgi?id=423)
Reproducible B

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Stewart Gordon <smjg iname.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
                 CC|                            |smjg iname.com
            Version|2.031                       |1.045
             Blocks|                            |340





Please remember to assign keywords to bug reports.  To everybody reading this:
Please look through issues you've reported and check for missing keywords.

And please report the full compiler output from the testcases you post.  It
makes it far easier for all of us to see what's going on.

C:\Users\Stewart\Documents\Programming\D\Tests\bugs>dmd bz3170a.d
bz3170a.d(8): Error: class reproA.C is forward referenced when looking for 'D'
bz3170a.d(8): Error: class reproA.C is forward referenced when looking for 'D'
bz3170a.d(8): Error: class reproA.C is forward referenced when looking for 'D'
bz3170a.d(5): Error: no property 'D' for type 'reproA.C'
bz3170a.d(5): Error: C.D is used as a type
bz3170a.d(5): Error: class reproA.A.B base type must be class or interface, not
void

C:\Users\Stewart\Documents\Programming\D\Tests\bugs>dmd bz3170b.d
bz3170b.d(9): Error: class reproB.C is forward referenced when looking for 'D'
bz3170b.d(9): Error: class reproB.C is forward referenced when looking for 'D'
bz3170b.d(9): Error: class reproB.C is forward referenced when looking for 'D'
bz3170b.d(5): Error: no property 'D' for type 'reproB.C'
bz3170b.d(5): Error: C.D is used as a type
bz3170b.d(5): Error: class reproB.A.B base type must be class or interface, not
void

(DMD 1.045 Win)

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Stewart Gordon <smjg iname.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Forward reference bugs      |Forward reference of nested
                   |                            |class fails if outer class
                   |                            |is abstract or derived





Another case that fails:
----------
class A {
    class B : C.D { }
}

class C : E {
    class D { }
}

class E { }
----------
bz3170c.d(5): Error: class bz3170c.C is forward referenced when looking for 'D'
bz3170c.d(5): Error: class bz3170c.C is forward referenced when looking for 'D'
bz3170c.d(5): Error: class bz3170c.C is forward referenced when looking for 'D'
bz3170c.d(2): Error: no property 'D' for type 'bz3170c.C'
bz3170c.d(2): Error: C.D is used as a type
bz3170c.d(2): Error: class bz3170c.A.B base type must be class or interface,
not void
----------

(Seems that the presence or absence of static doesn't affect the bug....)

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla digitalmars.com





22:40:35 PDT ---
This case:
----------
class A {
    class B : C.D { }
}

class C : E {
    class D { }
}

class E { }
----------
is wrong anyway because C.D is nested inside C, and cannot be instantiated
inside of A. (Because of the lack of an appropriate 'this' reference to use.)

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Tim M <tim.matthews7 gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|1.045                       |2.031
            Summary|Forward reference of nested |Forward reference of nested
                   |class fails if outer class  |class fails if outer class
                   |is abstract or derived      |is not plain





Stewart Gordon if you want to be a bugzilla cop can you please take care.

You changed the subject name but is not quite correct. The abstract keyword can
be replaced with many other keywords like public, protected, private etc. The
problem is that you can only forward reference to a nested class within a plain
outer class. I will update the summary.

You also changed the version to 1.045. I am reverting it back to 2.031 as this
has the most up to date forward reference implementation and is also the
version dnet(the software that this issue is for) is currently based on.

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Stewart Gordon <smjg iname.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|2.031                       |1.045







 You also changed the version to 1.045. I am reverting it back to 2.031 as this
 has the most up to date forward reference implementation 


No, the policy here is that
- we set the _oldest_ version in which the bug has been witnessed
- if a bug exists in both 1.x and 2.x, the 1.x version is set

Just one post along these lines (there are others):

http://www.digitalmars.com/d/archives/digitalmars/D/bugs/bugzilla_usage_tips_10071.html


 and is also the version dnet(the software that this issue is for) 
 is currently based on.


This bug is rooted in DMD, not in dnet.  What third-party compilers inherit a
bug is irrelevant to the filing of it here.

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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au









 You also changed the version to 1.045. I am reverting it back to 2.031 as this
 has the most up to date forward reference implementation 


 
 No, the policy here is that
 - we set the _oldest_ version in which the bug has been witnessed


That turns out to be completely useless, actually. It'd be _so_ much better if
there were only 3 versions: 1.x, 2.x, both.
For one thing, it means that any search for "1.x bugs" becomes invalid every
time there's a new compiler version!
And the exact version number is relevant only when there's a regression. And
that's handled better by a comment, anyway.


 - if a bug exists in both 1.x and 2.x, the 1.x version is set


That used to work well, when the compilers were almost identical. We're now
getting a lot of bugs which are 1.x only.

You're right about it being the policy, but it's actually not a helpful policy
at all. (OTOH, updating the version number to the most recent DMD is *really*
bad).
Adding keywords is extremely helpful.

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Cristi Vlasceanu <cristian zerobugs.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cristian zerobugs.org
            Version|1.045                       |2.031





08:57:43 PDT ---
Tim is right and I second the opinion that people that are just playing
bugzilla cops for the sake of it should not, if they do not understand the
bigger picture.

Walter made some changes to how forward references are handled in the 2.031
source. The intent of the bug report is to say that _after_ those changes,
there are still issues.

Also, because according to Walter, forward ref bugs are tricky, we probably _do
not_ want the 1.x code base fixed, since the "fixes" could have bad side
effects.

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Stewart Gordon <smjg iname.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|2.031                       |1.045







 No, the policy here is that
 - we set the _oldest_ version in which the bug has been witnessed


 
 That turns out to be completely useless, actually.  It'd be _so_ 
 much better if there were only 3 versions: 1.x, 2.x, both.


Maybe.  But until and unless this change happens, setting a bug that's present
in both lines to a 2.x version is misleading, since by current policy it gives
the impression that it's a (DM)D2-specific bug.


 For one thing, it means that any search for "1.x bugs" becomes invalid every
 time there's a new compiler version!


How do you work that out?


 - if a bug exists in both 1.x and 2.x, the 1.x version is set


 
 That used to work well, when the compilers were almost identical. We're now
 getting a lot of bugs which are 1.x only.


Like what?


 Adding keywords is extremely helpful.


Agreed.



 Tim is right and I second the opinion that people that are just playing
 bugzilla cops for the sake of it should not, if they do not understand the
 bigger picture.


Well, nobody here is playing a bugzilla cop for the sake of it.  I for one hold
that it's practically better if the information is accurate and not misleading
(see my response to Don above).


 Walter made some changes to how forward references are handled in the 2.031
 source. The intent of the bug report is to say that _after_ those changes,
 there are still issues.


The fact is that the bug exists in the D1 line, and as such the version field
should reflect this fact.  Maybe Walter'll tell us (or someone'll study the
code and find out) that, because of these changes, the underlying cause is
different and thus the fix is different.  But then it's a matter of writing the
fix for each (and considering whether this should be two separate bug reports),
not of pretending it doesn't exist in 1.x.


 Also, because according to Walter, forward ref bugs are tricky, we 
 probably _do not_ want the 1.x code base fixed, since the "fixes" 
 could have bad side effects.


Possibly, but it's not up to you to decide for him.

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20:26:55 PDT ---
I've emailed the fix to Cristi. For what it's worth, the problem and fix is
identical for D 1 and 2. It should not break any existing working code.

I won't mark this as fixed, however, until the release happens.

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 For one thing, it means that any search for "1.x bugs" becomes invalid every
 time there's a new compiler version!


 
 How do you work that out?


Because you can't do a search for "1.x bugs", you can only search for "1.0 +
1.01+ 1.02+... + 1.045". Then 1.046 gets added, and it's not in your search.
I'm getting really sick of it.



 - if a bug exists in both 1.x and 2.x, the 1.x version is set


 
 That used to work well, when the compilers were almost identical. We're now
 getting a lot of bugs which are 1.x only.


 
 Like what?


From my list of unpatched ICE bugs, there are 9 which are D1-specific:
1144, 1934, 2229, 2687, 1897, 3160, 1787, 2080, 2851.
There are 9 which are D2-specific.
There are another 7 which are common to both (this number is artificially low,
since there are the ones I put most effort into).
The difference in the compiler internals is increasing, so some patches which
work for D2 don't work for D1, and vice versa.






 

 Adding keywords is extremely helpful.


 
 Agreed.


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Matti Niemenmaa <matti.niemenmaa+dbugzilla iki.fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matti.niemenmaa+dbugzilla i
                   |                            |ki.fi





2009-07-16 07:03:35 PDT ---


 For one thing, it means that any search for "1.x bugs" becomes invalid every
 time there's a new compiler version!


 
 How do you work that out?


 
 Because you can't do a search for "1.x bugs", you can only search for "1.0 +
 1.01+ 1.02+... + 1.045". Then 1.046 gets added, and it's not in your search.
 I'm getting really sick of it.


See the bottom of http://d.puremagic.com/issues/query.cgi - "Advanced searching
using boolean charts". Version - is less than - 2 seems to work just fine.

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED





13:26:07 PDT ---
Fixed dmd 1.047 and 2.032

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