http://d.puremagic.com/issues/show_bug.cgi?id=7220

           Summary: Bad initialization when using mixin to generate a
                    static field in a -lib'rary
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: xtzgzorex@gmail.com


--- Comment #0 from Alex Rønne Petersen <xtzgzorex@gmail.com> 2012-01-04 10:17:29 PST ---
main.d:

module main;

import std.stdio,
       faulty;

static this()
{
    writefln("Faulty.instance: %s", Faulty.instance);
}

private int main(string[] args)
{
    writeln("Main");
    return 0;
}

faulty.d:

module faulty;

import std.stdio;

private mixin template DefineCoreType(string type)
{
    mixin("public final class " ~ type ~
          "{" ~
          "    private static " ~ type ~ " _instance;" ~
          "" ~
          "    @property public static " ~ type ~ " instance()" ~
          "    {" ~
          "        writeln(\"accessing " ~ type ~ ".instance()\");"~
          "        return _instance; " ~
          "    }" ~
          "" ~
          "    static this()" ~
          "    {" ~
          "        writeln(\"initializing " ~ type ~"._instance\");"~
          "        _instance = new " ~ type ~ "();" ~
          "    }" ~
          "" ~
          "}");
}

mixin DefineCoreType!("Faulty");

Compile with:

dmd -lib faulty.d
dmd main.d faulty.lib

Run the resulting main.exe, and you'll see this output:

accessing Faulty.instance()
Faulty.instance: null
initializing Faulty._instance
Main

but the expected output is:

initializing Faulty._instance
accessing Faulty.instance()
Faulty.instance: faulty.DefineCoreType!("Faulty").Faulty
Main

The error does not occur if faulty.d is not compiled as a -lib'rary (i.e. compiled directly into the executable), or if you unroll the mixin so faulty.d becomes like so:

module faulty;

import std.stdio;

// this works properly!

public final class Faulty
{
    private static Faulty _instance;

    @property public static Faulty instance()
    {
        writeln("accessing Faulty.instance()");
        return _instance;
    }

    static this()
    {
        writeln("initializing Faulty._instance");
        _instance = new Faulty();
    }
}

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SomeDude <lovelydear@mailmetrash.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lovelydear@mailmetrash.com


--- Comment #1 from SomeDude <lovelydear@mailmetrash.com> 2012-04-19 12:52:30 PDT ---
Confirmed with 2.059 on win32

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Manu <turkeyman@gmail.com> changed:

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


--- Comment #2 from Manu <turkeyman@gmail.com> 2012-11-12 05:53:16 PST ---
I'm seeing symptoms that look like this bug.
I have a mixin template introducing shared static this() into many of my
modules, and only some of them are called on startup.
Many of them are simply not called, and I crash on uninitialised data.

Latest DMD - Win64, building a DLL.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #3 from Walter Bright <bugzilla@digitalmars.com> 2012-11-12 20:24:17 PST ---
This gets quite a bit simpler:

---------- faulty.d -------------
module faulty;

import core.stdc.stdio;

mixin template DefineCoreType(string type)
{
    class Faulty
    {
        static int x;
      static void instance()
      {
          printf("Faulty.instance()\n");
          x = 3;
      }

      static this()
      {
          printf("Faulty.static this\n");
      }
    }
}

mixin DefineCoreType!("Faulty");
---------- bar.d -------------------------
import core.stdc.stdio,
       faulty;

static this()
{
    Faulty.instance();
    assert(Faulty.x == 3);
    printf("bar.static this\n");
}

private int main(string[] args)
{
    printf("Main\n");
    return 0;
}
------------------------------------------

dmd -lib faulty
dmd bar faulty.lib
bar

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--- Comment #4 from github-bugzilla@puremagic.com 2012-11-12 23:43:47 PST ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/af887b44f3bd592973037a2dc8f5ec91cc8b2626
fix Issue 7220 - Bad initialization when using mixin to generate a static field
in a -lib'rary

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Walter Bright <bugzilla@digitalmars.com> changed:

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


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--- Comment #5 from github-bugzilla@puremagic.com 2012-11-16 13:49:29 PST ---
Commit pushed to dmd-1.x at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/0cb89561a45edd46440d51e5807e4e1434735d24
fix Issue 7220 - Bad initialization when using mixin to generate a static field
in a -lib'rary

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