• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (7/7) Jan 30 2013 A friend of mine is trying to figure out the D equivalent of using
• Philippe Sigaud (9/14) Jan 30 2013 do
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (43/57) Jan 30 2013 you do

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

A friend of mine is trying to figure out the D equivalent of using 
macros with asm blocks in C:

#define NEXT() __asm__("jmp *%0"::"r"((++ip)->jmp)); goto *ip->jmp

D's asm blocks are very restrictive: mixins are not allowed. What do you 
do in D?

Thank you,
Ali

Philippe Sigaud <philippe.sigaud gmail.com> writes:

On Wed, Jan 30, 2013 at 4:01 PM, Ali =C3=87ehreli <acehreli yahoo.com> wrot=
e:
 A friend of mine is trying to figure out the D equivalent of using macros
 with asm blocks in C:

 #define NEXT() __asm__("jmp *%0"::"r"((++ip)->jmp)); goto *ip->jmp

 D's asm blocks are very restrictive: mixins are not allowed. What do you =

do
 in D?

Is it possible to enclose an asm statement into a mixin?

mixin("
asm {

....

code to include

}");

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 01/30/2013 11:08 AM, Philippe Sigaud wrote:
 On Wed, Jan 30, 2013 at 4:01 PM, Ali Çehreli<acehreli yahoo.com>  wrote:
 A friend of mine is trying to figure out the D equivalent of using 


macros
 with asm blocks in C:

 #define NEXT() __asm__("jmp *%0"::"r"((++ip)->jmp)); goto *ip->jmp

 D's asm blocks are very restrictive: mixins are not allowed. What do 


you do
 in D?

 Is it possible to enclose an asm statement into a mixin?

 mixin("
 asm {

 ....

 code to include

 }");

Thanks!

It is almost there, except that one needs to use a compile-time "macro 
expansion" solution, which I am too lazy to try now. :) I am confident 
that the following program will work after doing that. (Of course also 
after replacing 'writeln' with 'mixin'.)

import std.stdio;
import std.regex;

string expandNexts(string input)
{
     enum e = ctRegex!("Next;", "g");
     // NOTE: This is an example. Of course, the second string below 
should be
     // whatever the "macro" should be expanded as.
     return replace(input, e, "cmp EAX,0;");
}

void main()
{
     writeln (expandNexts(q{
         asm
         {
             mov EAX, 10000;
             Next;
             Next;
             Next;
             Next;
             Next;
         }
     }));
}

The program prints

         asm
         {
             mov EAX, 10000;
             cmp EAX,0;
             cmp EAX,0;
             cmp EAX,0;
             cmp EAX,0;
             cmp EAX,0;
         }

Ali