http://d.puremagic.com/issues/show_bug.cgi?id=7197

           Summary: enum string doesn't work with CTFE
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrei@metalanguage.com


--- Comment #0 from Andrei Alexandrescu <andrei@metalanguage.com> 2012-01-01 17:44:07 PST ---
import std.stdio;

string toConcatenatedForm(string m, string[] args...)
{
    string result = "q{";
    for (;;)
    {
        if (!m.length)
        {
            return result ~ '}';
        }
        if (m[0] != '$')
        {
            result ~= m[0];
            m = m[1 .. $];
            continue;
        }
        if (m[1] >= '1' && m[1] <= '9')
        {
            result ~= "} ~ ";
            result ~= "expand!(q{" ~ args[m[1] - '1'] ~ "}) ~ q{";
            m = m[2 .. $];
            continue;
        }
    }
}

template expand(string m, args...)
{
    enum string expand = mixin(toConcatenatedForm(m, args));
}

unittest
{
    enum string s = expand!("$1", "abc");
    writeln(s);
    writeln(expand!("$1", s));
}

void main(){}

The code above causes an ICE:

Assertion failed: (v->ctfeAdrOnStack >= 0 && v->ctfeAdrOnStack <
stackPointer()), function setValue, file interpret.c, line 100.

Replacing the first line in the unittest with

    static immutable string s = expand!("$1", "abc");

makes the code work.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=7197


bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs@eml.cc


--- Comment #1 from bearophile_hugs@eml.cc 2012-01-01 18:15:19 PST ---
Reduced a bit:


int foo(int[] x...) {
    return 0;
}
template bar(y...) {
    enum int bar = foo(y);
}
enum int z = 1;
enum int w = bar!(z);
void main() {}

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

On Monday, 2 January 2012 at 02:15:21 UTC, bearophile_hugs@eml.cc wrote:
> http://d.puremagic.com/issues/show_bug.cgi?id=7197
>
>
> bearophile_hugs@eml.cc changed:
>
>          What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                CC|                            |bearophile_hugs@eml.cc
>
>
> --- Comment #1 from bearophile_hugs@eml.cc 2012-01-01 18:15:19 PST ---
> Reduced a bit:
>
>
> int foo(int[] x...) {
>   return 0;
> }
> template bar(y...) {
>   enum int bar = foo(y);
> }
> enum int z = 1;
> enum int w = bar!(z);
> void main() {}

Weird, it can be fixed by changing z to a const:
int foo(int[] x...) { return 0; }
template bar(y...) { enum int bar = foo(y); }
const int z = 1;
enum int w = bar!(z);
void main() {}

I'm unable to upgrade to 2.057 because of this bug, it works fine in 2.056.

http://d.puremagic.com/issues/show_bug.cgi?id=7197


Geoffrey Brown <erkle64@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |erkle64@gmail.com


--- Comment #2 from Geoffrey Brown <erkle64@gmail.com> 2012-01-25 10:00:46 PST ---
Weird, it can be fixed by changing z to a const:

int foo(int[] x...) {
  return 0;
}
template bar(y...) {
  enum int bar = foo(y);
}
const int z = 1;
enum int w = bar!(z);
void main() {}

I'm unable to upgrade to 2.057 because of this bug, it works fine in 2.056.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=7197


timon.gehr@gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timon.gehr@gmx.ch
           Severity|normal                      |regression


-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=7197



--- Comment #3 from github-bugzilla@puremagic.com 2012-01-27 00:51:34 PST ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/6c081a2bf05524c83e87c71819a9240009a8a7e7 7197 enum string doesn't work with CTFE

Fixes bug 7197.
Oddly, this was actually a bug in the const folding for comma expressions.
The code was originally there as a workaround for another problem which has
since been fixed.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=7197


Walter Bright <bugzilla@digitalmars.com> changed:

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


-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------