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digitalmars.D.learn - Internal error from DMD

reply Bradley Smith <digitalmars-com baysmith.com> writes:
Is this a bug? Should the DMD compiler ever give an internal error?

import std.stdio;
import std.boxer;

void main() {
	Object[] l;
	l ~= cast(Object) box(1);
	int a = unbox!(int)(cast(Box) l[0]);
	writefln("value %d", a);
}


dmd tmp.d c:\dmd\src\phobos\std\boxer.d


tmp.d(6): e2ir: cannot cast from Box to object.Object
tmp.d(7): e2ir: cannot cast from object.Object to Box
Internal error: e2ir.c 267


Thanks,
   Bradley
Jun 23 2006
parent reply "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Bradley Smith" <digitalmars-com baysmith.com> wrote in message 
news:e7hvil$1ffi$1 digitaldaemon.com...

 Is this a bug? Should the DMD compiler ever give an internal error?


Considering it's in alpha, the compiler is allowed to have some slack ;) 
But no, it's not _supposed_ to have internal errors.  Any internal error is 
a bug.


 import std.stdio;
 import std.boxer;

 void main() {
 Object[] l;
 l ~= cast(Object) box(1);


You can't cast a box to Object; box is a struct, not a class.  If you want 
an array of boxes, hava a look at boxArray().


 int a = unbox!(int)(cast(Box) l[0]);
 writefln("value %d", a);
 }


dmd tmp.d c:\dmd\src\phobos\std\boxer.d


 tmp.d(6): e2ir: cannot cast from Box to object.Object
 tmp.d(7): e2ir: cannot cast from object.Object to Box
 Internal error: e2ir.c 267
Jun 23 2006
parent reply Bradley Smith <digitalmars-com baysmith.com> writes:
I didn't mean to be overly critical of the compiler. I wasn't sure how 
to interpret the "Internal error" message, and I just wanted to confirm 
that the objective was to not have any internal errors.

What is the proper procedure for reporting a bug?

Thanks for the pointer about Box and Object. I'm still learning how D 
handles data.

Thanks,
   Bradley


Jarrett Billingsley wrote:

 "Bradley Smith" <digitalmars-com baysmith.com> wrote in message 
 news:e7hvil$1ffi$1 digitaldaemon.com...

 Is this a bug? Should the DMD compiler ever give an internal error?


 
 Considering it's in alpha, the compiler is allowed to have some slack ;) 
 But no, it's not _supposed_ to have internal errors.  Any internal error is 
 a bug.
 

 import std.stdio;
 import std.boxer;

 void main() {
 Object[] l;
 l ~= cast(Object) box(1);


 
 You can't cast a box to Object; box is a struct, not a class.  If you want 
 an array of boxes, hava a look at boxArray().
 

 int a = unbox!(int)(cast(Box) l[0]);
 writefln("value %d", a);
 }


 dmd tmp.d c:\dmd\src\phobos\std\boxer.d


 tmp.d(6): e2ir: cannot cast from Box to object.Object
 tmp.d(7): e2ir: cannot cast from object.Object to Box
 Internal error: e2ir.c 267
Jun 24 2006
parent reply "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Bradley Smith" <digitalmars-com baysmith.com> wrote in message 
news:449CF0E7.3020107 baysmith.com...

I didn't mean to be overly critical of the compiler. I wasn't sure how to 
interpret the "Internal error" message, and I just wanted to confirm that 
the objective was to not have any internal errors.


Oh no, I didn't take it that way.  Don't worry about it.


 What is the proper procedure for reporting a bug?


The most proper is through the D bugzilla: 
http://d.puremagic.com/bugzilla/index.cgi

You'll set up an account and then you can add the bug using the "Enter a new 
issue" link.  As far as I can find, this issue hasn't been added to bugzilla 
yet.


 Thanks for the pointer about Box and Object. I'm still learning how D 
 handles data.


Sure.  Just wondering what you're trying to store?  There might be a simpler 
way to store it, whatever it is; I've personally never had to use boxes, 
though maybe you're coming from a dynamically typed background.
Jun 24 2006
parent reply Bradley Smith <digitalmars-com baysmith.com> writes:
Jarrett Billingsley wrote:


 Sure.  Just wondering what you're trying to store?  There might be a simpler 
 way to store it, whatever it is; I've personally never had to use boxes, 
 though maybe you're coming from a dynamically typed background. 
 


I'm experimenting with converting some Java code to D, and the code 
stores int, boolean, and String data in a list through the Integer and 
Boolean wrapper objects. Using the D boxer is the only way I've found to 
  create a heterogeneous array which includes primitive data elements.

Perhaps the need for boxing could be eliminated by making the code more 
D-like, but at this point, I'm only trying a straight translation.

   Bradley
Jun 25 2006
parent Chris Nicholson-Sauls <ibisbasenji gmail.com> writes:
Bradley Smith wrote:

 Jarrett Billingsley wrote:
 

 Sure.  Just wondering what you're trying to store?  There might be a 
 simpler way to store it, whatever it is; I've personally never had to 
 use boxes, though maybe you're coming from a dynamically typed 
 background.


 
 
 I'm experimenting with converting some Java code to D, and the code 
 stores int, boolean, and String data in a list through the Integer and 
 Boolean wrapper objects. Using the D boxer is the only way I've found to 
  create a heterogeneous array which includes primitive data elements.
 
 Perhaps the need for boxing could be eliminated by making the code more 
 D-like, but at this point, I'm only trying a straight translation.
 
   Bradley


Well, if it only ever works with those three types, you could go with a Var
struct.















You can simplify creation of Var structs with a set of static call operators,
like such:













While it isn't /the/ most elegant solution possible, its tried and true, and
pretty 
effective for definite sets of types.

-- Chris Nicholson-Sauls
Jun 26 2006