• unDEFER (18/18) Jul 25 2017 Hello!
• Steven Schveighoffer (7/29) Jul 25 2017 I think it's likely that these are actually C++ classes, and probably
• unDEFER (5/5) Jul 25 2017 I have found the answer in the code.
• Nicholas Wilson (3/8) Jul 25 2017 grep for kluge in code, you'll find all the places it does its
• Jacob Carlborg (6/13) Jul 25 2017 That's the correct solution. For Expression, there's a field called "op"...
• unDEFER (2/5) Jul 26 2017 Thank you for hint!

unDEFER <undefer gmail.com> writes:

Hello!
I'm hacking dmd compiler and trying to look on members array just 
after parse module.

for(uint i = 0; i < members.dim; i++)
{
      Dsymbol m = (*members)[i];

// It is good, but further:

     Import imp = cast(Import) m;
     if (imp !is null)
     {
         printf("++++ import %s.%s\n", imp.packages.toChars(), 
imp.id.toChars());
     }
// ...
}

For really imports casting doing well. But for not imports it 
again casts, imp not is null and  the compiler crashes.
What I'm doing wrong?

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 7/25/17 4:36 PM, unDEFER wrote:
 Hello!
 I'm hacking dmd compiler and trying to look on members array just after 
 parse module.
 
 for(uint i = 0; i < members.dim; i++)
 {
       Dsymbol m = (*members)[i];
 
 // It is good, but further:
 
      Import imp = cast(Import) m;
      if (imp !is null)
      {
          printf("++++ import %s.%s\n", imp.packages.toChars(), 
 imp.id.toChars());
      }
 // ...
 }
 
 For really imports casting doing well. But for not imports it again 
 casts, imp not is null and  the compiler crashes.
 What I'm doing wrong?

I think it's likely that these are actually C++ classes, and probably 
there is no RTTI, so this is a reinterpret cast. This is a wild guess, 
but much of the compiler still needs to interface with C++ backend.

I would look elsewhere in the compiler to see how they handle this type 
of thing. Not sure of dynamic_cast support?

-Steve

unDEFER <undefer gmail.com> writes:

I have found the answer in the code.
Right code is:

Import imp = m.isImport();
if (imp !is null)

Thank you.

Nicholas Wilson <iamthewilsonator hotmail.com> writes:

On Tuesday, 25 July 2017 at 21:06:25 UTC, unDEFER wrote:
 I have found the answer in the code.
 Right code is:

 Import imp = m.isImport();
 if (imp !is null)

 Thank you.

grep for kluge in code, you'll find all the places it does its 
own RTTI.

Jacob Carlborg <doob me.com> writes:

On 2017-07-25 23:06, unDEFER wrote:
 I have found the answer in the code.
 Right code is:
 
 Import imp = m.isImport();
 if (imp !is null)
 
 Thank you.

That's the correct solution. For Expression, there's a field called "op" 
that indicates what kind of expression it is, which can used in 
combination with a cast.

-- 
/Jacob Carlborg

unDEFER <undefer gmail.com> writes:

On Wednesday, 26 July 2017 at 06:50:21 UTC, Jacob Carlborg wrote:
 For Expression, there's a field called "op" that indicates what 
 kind of expression it is, which can used in combination with a 
 cast.

Thank you for hint!