• Walter (2/2) Sep 04 2003 I wrote this in response to many questions about it:
• Philippe Mori (14/16) Sep 05 2003 I think it would be very usefull if someone can write a tool that will
• Mark T (1/4) Sep 05 2003 how about yourself?
• Philippe Mori (25/30) Sep 05 2003 Since Digital Mars already have a C/C++ compiler it might be possible
• Ilya Minkov (22/44) Sep 05 2003 Well, C++ Builder can compile Delphi sources, because it has an embedded...
• Philippe Mori (33/66) Sep 06 2003 The point was that with C++ Builder, the .hpp file will get generated
• Ilya Minkov (24/55) Sep 06 2003 DMC++ is closed source -- and that for a good and understandable reason....
• Ilya Minkov (27/33) Sep 05 2003 I was actually the one who has promised to write one, but i haven't had
• Martin M. Pedersen (7/10) Sep 05 2003 Hi,
• Ilya Minkov (14/16) Sep 05 2003 Ah, thanks, it probably would help. :)
• Martin M. Pedersen (979/987) Sep 05 2003 C99
• Ilya Minkov (6/7) Sep 05 2003 Thanks a lot!

"Walter" <walter digitalmars.com> writes:

I wrote this in response to many questions about it:

www.digitalmars.com/d/htomodule.html

"Philippe Mori" <philippe_mori hotmail.com> writes:

"Walter" <walter digitalmars.com> a écrit dans le message de
news:bj9bd0$4ir$1 digitaldaemon.com...
 I wrote this in response to many questions about it:

 www.digitalmars.com/d/htomodule.html

I think it would be very usefull if someone can write a tool that will
automatically do the translation and
that is able to convert most standard C header and most Windows headers
without problems and also
header files generated by MIDL from an IDL file.

Even if const as a type modifier is not added to D (I think we should), I
think we should support its
presence for automatic import without being less safe. So we should at least
support const for extern
function where const is supported.

We should either support fastcall for extern or automatically generate
shim...

Mark T <Mark_member pathlink.com> writes:

I think it would be very usefull if someone can write a tool that will
automatically do the translation and
that is able to convert most standard C header and most Windows headers


how about yourself?

"Philippe Mori" <philippe_mori hotmail.com> writes:

"Mark T" <Mark_member pathlink.com> a écrit dans le message de
news:bja5hm$19b7$1 digitaldaemon.com...
I think it would be very usefull if someone can write a tool that will
automatically do the translation and
that is able to convert most standard C header and most Windows headers


 how about yourself?

Since Digital Mars already have a C/C++ compiler it might be possible
to modify it so that it would be able to produce D file. I think that
Borland
uses Delphi compiler to convert Delphi files to C++ one that are used by
C++ Builder...

Another possibility might be to make the D compiler able to import .h
file and make it visible some part of it... We can start by importing
POD style struct, function declaration that are compatible (uses
compatible parameters, return type and calling convention) and constants
(define and real constant).

If we do that, we could uses a special define that the D compiler
would define so that we might modify the source header if required.
We could also have the D version available as a define...

Thus one would be able to force something to be ignored by the
D compiler if for some reason it does not works (and not properly
skipped) or would be able to add some extra definition like shims
for the D compiler... and even include a file where someone could
put D stuff for things that where not converted.

I don't have much time to do it... but I think it would be worthwhile
to have it done so that typical C header files could be used...

And it might also be interesting to be able to do the conversion
in the opposite direction in some cases... so that D code could be
used from C/C++.

Ilya Minkov <minkov cs.tum.edu> writes:

Philippe Mori wrote:
 Since Digital Mars already have a C/C++ compiler it might be possible
 to modify it so that it would be able to produce D file. I think that
 Borland
 uses Delphi compiler to convert Delphi files to C++ one that are used by
 C++ Builder...

Well, C++ Builder can compile Delphi sources, because it has an embedded 
Delphi compiler. Delphi compiled object files seem to contain interface 
information in a convenient binary form, so further parsing is not 
requiered. ;)

 Another possibility might be to make the D compiler able to import .h
 file and make it visible some part of it... We can start by importing
 POD style struct, function declaration that are compatible (uses
 compatible parameters, return type and calling convention) and constants
 (define and real constant).

Just look at it: all you are suggesting is to put more work on Walter. 
Shame on you! Digitalmars is definately not Borland or something. He 
doesn't even come to implement some really vital parts of D 
specification. ;)

 If we do that, we could uses a special define that the D compiler
 would define so that we might modify the source header if required.
 We could also have the D version available as a define...

Martin Pederson was very kind to donate a pre-processor, which would be 
a vital part of the converter, which i intend to work almost like SWIG, 
which allows exactky that. There are 2 reasons why SWIG shouldn't be used:

  - it is designed to deal with languages almost imcompatible with C, 
and thus supports very few types;
  - it is GPLed, which is bad for us. We want MIT-style license and/or a 
donation to DigitalMars.

 Thus one would be able to force something to be ignored by the
 D compiler if for some reason it does not works (and not properly
 skipped) or would be able to add some extra definition like shims
 for the D compiler... and even include a file where someone could
 put D stuff for things that where not converted.

Yup, generating wrappers in C might come later. This is only requiered 
for interfacing C++.

 I don't have much time to do it...

Neither do i... Nor does anyone...

 And it might also be interesting to be able to do the conversion
 in the opposite direction in some cases... so that D code could be
 used from C/C++.

Can't really imagine - there are next to no libraries for D. :) Besides, 
it's much harder this way. First, C++ interoperation should work...

-eye

"Philippe Mori" <philippe_mori hotmail.com> writes:

 Since Digital Mars already have a C/C++ compiler it might be possible
 to modify it so that it would be able to produce D file. I think that
 Borland
 uses Delphi compiler to convert Delphi files to C++ one that are used by
 C++ Builder...

 Well, C++ Builder can compile Delphi sources, because it has an embedded
 Delphi compiler. Delphi compiled object files seem to contain interface
 information in a convenient binary form, so further parsing is not
 requiered. ;)

The point was that with C++ Builder, the .hpp file will get generated
automatically when compiler from C++ Builder. I don't exactly how it
works but I think that essentially the Delphi compiler is called with an
option for that... and I was wondering if this might be possible to
do something similar using Difital Mars C++ compiler...

I think the main problem is that C++ is so complex compared to
most other language that it would be more difficult to start from
C/C++ files.

But if we look at Borland, they start with rudimentary support
and add more from version to version...


 Another possibility might be to make the D compiler able to import .h
 file and make it visible some part of it... We can start by importing
 POD style struct, function declaration that are compatible (uses
 compatible parameters, return type and calling convention) and constants
 (define and real constant).

 Just look at it: all you are suggesting is to put more work on Walter.
 Shame on you! Digitalmars is definately not Borland or something. He
 doesn't even come to implement some really vital parts of D
 specification. ;)

Well... these are suggestions on how I think it might be done... I
understand that often we don't have the ressource to do everything we
would like. OTOH, if it is easy to uses D in a mixed language
environment, it might help it a lot to become a popular language.

If I am the only one that would like it, then it might be ignored
but I do think that even just for implementing the D compiler
C stuff will be need and it might be a good investisment...

Maybe the solution would be that D be able to compile for the .NET
environment and being able to uses .NET component.

 If we do that, we could uses a special define that the D compiler
 would define so that we might modify the source header if required.
 We could also have the D version available as a define...

 Martin Pederson was very kind to donate a pre-processor, which would be
 a vital part of the converter, which i intend to work almost like SWIG,
 which allows exactky that. There are 2 reasons why SWIG shouldn't be used:

   - it is designed to deal with languages almost imcompatible with C,
 and thus supports very few types;
   - it is GPLed, which is bad for us. We want MIT-style license and/or a
 donation to DigitalMars.

Well, I think the solution would be instead to modify Digital Mars C++
compiler and/or other tools to be able to output D module...
But maybe the compiler code is too complicate for that to be
easy enough to make sense...

 And it might also be interesting to be able to do the conversion
 in the opposite direction in some cases... so that D code could be
 used from C/C++.

 Can't really imagine - there are next to no libraries for D. :) Besides,
 it's much harder this way. First, C++ interoperation should work...

Well this is true if we want full support... but we might start with
partial support. This might include exporting functions, POD types,
alias and interfaces (for functions and interfaces, all parameters
and the return value also need to be compatible).

I have read that D interfaces are COM compatible so it would also
make sense to have the D compiler generate information (IDL) or
being able to import an IDL...

In fact, if we are able to uses an IDL (which is probably simpler that
C and surely simpler than C++), one would be able to do an IDL
that will be usable from both C/C++ and D...

Ilya Minkov <minkov cs.tum.edu> writes:

Philippe Mori wrote:
 The point was that with C++ Builder, the .hpp file will get generated
 automatically when compiler from C++ Builder. I don't exactly how it
 works but I think that essentially the Delphi compiler is called with an
 option for that... and I was wondering if this might be possible to
 do something similar using Difital Mars C++ compiler...

DMC++ is closed source -- and that for a good and understandable reason. 
Pumping it up is bad for community, and for D programming language...

 I think the main problem is that C++ is so complex compared to
 most other language that it would be more difficult to start from
 C/C++ files.

True.

 But if we look at Borland, they start with rudimentary support
 and add more from version to version...

That's also our way.

 OTOH, if it is easy to uses D in a mixed language
 environment, it might help it a lot to become a popular language.

Certainly.

 If I am the only one that would like it, then it might be ignored
 but I do think that even just for implementing the D compiler
 C stuff will be need and it might be a good investisment...

For implementing D compiler, current library is almost enough.

 Maybe the solution would be that D be able to compile for the .NET
 environment and being able to uses .NET component.

Yes, that would be a good and feasible thing. Someone would just have to 
hack the D frontend - and it's not gonna be myself since i *really* have 
other things to do. I'm even in the process of loosing my interest in D.

 Well, I think the solution would be instead to modify Digital Mars C++
 compiler and/or other tools to be able to output D module...
 But maybe the compiler code is too complicate for that to be
 easy enough to make sense...

We *don't* *have* DMC++ compiler code. Nor do we want it, since that's 
what Walter earns his living from. There are open-source compilers, but 
only TenDRA doesn't have licensing issues. BTW, good that you remind me 
of it, it's frontend is worth taking a look. :)

Ah, another idea: it is probably easy to make a D compiler that outputs 
TDF - a bytecode format with which tools associated with TenDRA project 
work.

 Well this is true if we want full support... but we might start with
 partial support. This might include exporting functions, POD types,
 alias and interfaces (for functions and interfaces, all parameters
 and the return value also need to be compatible).

The difference is, for rudimentary support importing C, only 
declarations need to be generated. For C++ import and for D->C/C++ 
export alike, big sets of wrappers have to be generated - which is 
simply a different kind of complexity.

 I have read that D interfaces are COM compatible so it would also
 make sense to have the D compiler generate information (IDL) or
 being able to import an IDL...

This should be a task of a separate tool... A very worthy one.

 In fact, if we are able to uses an IDL (which is probably simpler that
 C and surely simpler than C++), one would be able to do an IDL
 that will be usable from both C/C++ and D...

That's the way that SWIG has gone, and our tool should be similar...

-eye

Ilya Minkov <midiclub 8ung.at> writes:

Philippe Mori wrote:
 I think it would be very usefull if someone can write a tool that
 will automatically do the translation and that is able to convert
 most standard C header and most Windows headers without problems and
 also header files generated by MIDL from an IDL file.

I was actually the one who has promised to write one, but i haven't had 
enough time. I didn't even start the project, because i announced i'm no 
way willing to do it on my own, but noone wanted to join. This leads to 
conclusion that noone actually needs the tool.

 We should either support fastcall for extern or automatically
 generate shim...

No, not necessarily. You cannot even expect multiple C++ compilers to 
interoperate on __fastcall, since it's not standard. BCC and MSVC 
implement fastcall differently, DMC doesn't implement one at all. In 
general: never use fastcall for any interfaces. And if it's used in a 
library, i'd simply make a #define trick to convert it into Pascal 
convention to be able to use such a library with DMC.

What would be more important, is support for C++ classes. Maybe through 
interfaces? There are also differencies between compilers, so SWIG 
simply wraps up a C++ class in a set of C functions... Maybe it's the 
way to go.

Another thing that SWIG has done right is a selective pre-processor.
Mike Wynn has also put up some ideas for the convertor.

http://www.l8night.co.uk/mwynn/d/deimos.html

3-way diffing probably makes little sense. I proposed configuration 
files, which would discard some identifiers, and point out how to 
convert others. If the scanner finds new identifiers which it isn't sure 
how to convert, it is to add them in some section for "undecided" ones. 
And the user would cut-and-paste it to the other section, which 
describes what to do. Also, since we would have our own pre-processor, 
we can provide all kinds of syntax inside the header-file inside "#ifdef 
DEIMOS" or something alike.

-eye

"Martin M. Pedersen" <martin moeller-pedersen.dk> writes:

Hi,

"Ilya Minkov" <midiclub 8ung.at> wrote in message
news:bjaioc$1su1$1 digitaldaemon.com...
 describes what to do. Also, since we would have our own pre-processor,
 we can provide all kinds of syntax inside the header-file inside "#ifdef
 DEIMOS" or something alike.

If it would help, I would be happy to supply a preprocessor. I wrote a C99
compliant (I hope) preprocessor for another toy project of mine.

Regards,
Martin M. Pedersen

Ilya Minkov <minkov cs.tum.edu> writes:

Martin M. Pedersen wrote:
 If it would help, I would be happy to supply a preprocessor. I wrote a C99
 compliant (I hope) preprocessor for another toy project of mine.

Ah, thanks, it probably would help. :)

Is it written in C, C++ or D? And did you use any parsing framework?

The only problem is, whenever it finds a macro definition, it must
supply its full text to a function. This function would return a boolean
result, which would tell the preprocessor, whether the definition has to
be discarded or used.

Another thing we need is some parser generator with D output... There is
a ton which can be adapted. I would personally like something in the
sort of boost.spirit ;)

-eye

PS. I reposted this message, this time my e-mail adress is correct. :) I 
just noticed the one that was entered here before has already been 
disabled for 15 months. :))))))))))))

"Martin M. Pedersen" <martin moeller-pedersen.dk> writes:

"Ilya Minkov" <midiclub 8ung.at> wrote in message
news:bjas5p$29v2$1 digitaldaemon.com...
 If it would help, I would be happy to supply a preprocessor. I wrote a


C99
 compliant (I hope) preprocessor for another toy project of mine.

 Ah, thanks, it probably would help. :)

 Is it written in C, C++ or D? And did you use any parsing framework?

It is in plain C, and I did not use any framework. It is attached.

It is a library which interface is defined by "cpp.h". "main.c" implements a
traditional "cpp" command using that library, and demonstrates its use.
Documentation has been a non-issue for me (until now perhaps), but the idea
is that the client keeps calling cpp_gettoken() until end-of-input. A token
returned is valid until the next call to cpp_gettoken(). Errors and pragmas
are returned as tokens in the token stream where they appeared. It is left
over to the client to do whatever it find suitable with the token. Normal
preprocessing will handle errors and pragma specially, and emit the
whitespaces which is also returned as tokens. If used as a frontend for a C
parser, whitespaces is to be ignored, and there will also be needed some
special handling of identifiers - keywords would probably need to be
identified and given special token tags. Preprocessing numbers would also
need to be transformed into integers or floating point literals.

 The only problem is, whenever it finds a macro definition, it must
 supply its full text to a function. This function would return a boolean
 result, which would tell the preprocessor, whether the definition has to
 be discarded or used.

The library builds a table of macros while preprocessing. This table is
available, and the "cpp" command dumps it if given the "-m" option. This
table could be used for other purposes, of cause.

Regards,
Martin M. Pedersen


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end

Ilya Minkov <minkov cs.tum.edu> writes:

Martin M. Pedersen wrote:
 It is in plain C, and I did not use any framework. It is attached.

Thanks a lot!

Documentation is probably not requiered - the source is well commented.
It contains a lot of C-specific stuff though. I think i convert it to D, 
then most source is cleaned out...

-eye