https://d.puremagic.com/issues/show_bug.cgi?id=11559

           Summary: Optlink crash with more than 2048 modules generated
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: ice
          Severity: critical
          Priority: P2
         Component: Optlink
        AssignedTo: nobody@puremagic.com
        ReportedBy: yebblies@gmail.com


--- Comment #0 from yebblies <yebblies@gmail.com> 2013-11-20 17:30:18 EST ---
Due to https://github.com/D-Programming-Language/dmd/pull/2785 dmd now generates one module per mixin line.

string gen()
{
    string m;
    foreach(i; 0..2048)
        m ~= "mixin(\"assert(0);\");\n";
    return m;
}

void main()
{
    mixin(gen());
}

Causes a dmd regression.

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Walter Bright <bugzilla@digitalmars.com> changed:

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


--- Comment #1 from Walter Bright <bugzilla@digitalmars.com> 2013-11-20 21:09:32 PST ---
Well, that was unexpected.

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Optlink crash with more     |Optlink crash with more
                   |than 2048 modules generated |than 2048 modules generated
                   |                            |and debug info


--- Comment #2 from yebblies <yebblies@gmail.com> 2013-11-22 19:24:05 EST ---
I forgot to add: This only happens with debug info enabled.  -g or -gc make it crash.

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9999 <mailnew4ster@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mailnew4ster@gmail.com
           Severity|critical                    |regression


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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|regression                  |critical


--- Comment #3 from yebblies <yebblies@gmail.com> 2013-11-25 11:37:55 EST ---
This is the optlink bug, which is not a regression.

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Brad Roberts <braddr@puremagic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |braddr@puremagic.com
           Severity|critical                    |regression


--- Comment #4 from Brad Roberts <braddr@puremagic.com> 2013-11-25 18:05:32 PST ---
Changing back to regression.  It's not directly a regression of dmd, but the combination of a dmd change and an optlink limit results in code that built before not building now.

It's the same category of issues as any bug that causes the linker to reject a dmd generated object file.

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--- Comment #5 from Walter Bright <bugzilla@digitalmars.com> 2013-12-24 01:16:36 PST ---
Fixed in Optlink 8.00.14:

http://ftp.digitalmars.com/optlink.zip

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--- Comment #6 from yebblies <yebblies@gmail.com> 2013-12-25 02:38:15 EST ---
How much did you bump it by?  The original test case now works, but this fails:

string gen()
{
    string m;
    foreach(i; 0..4096)
        m ~= "mixin(\"assert(0);\n\n\n\n\");\n";
    return m;
}

void main()
{
    mixin(gen());
}

I'm mixin'ing a string into each function in ddmd, so this isn't a synthetic test case.

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--- Comment #7 from Walter Bright <bugzilla@digitalmars.com> 2013-12-24 09:49:05 PST ---
(In reply to comment #6)
> How much did you bump it by?

I didn't bump it at all. I changed the allocation scheme for that table to one that allocated the desired size, rather than allocating a 16K buffer and hoping it wouldn't overflow.

You're probably seeing an overflow from another table. I'll look into it.

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--- Comment #8 from Walter Bright <bugzilla@digitalmars.com> 2013-12-25 13:44:49 PST ---
(In reply to comment #7)
> You're probably seeing an overflow from another table. I'll look into it.

I found that particular problem and uploaded a fix.

http://ftp.digitalmars.com/optlink.zip

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