www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - [Issue 1542] New: static array size limitation is too restrictive

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1542

           Summary: static array size limitation is too restrictive
           Product: D
           Version: 1.021
          Platform: PC
        OS/Version: All
            Status: NEW
          Keywords: patch, rejects-valid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: thecybershadow gmail.com


Source:
uint[4096][4096] myBigMap;

Output:
bug.d(1): Error: index 4096 overflow for static array

Remarks:
I do not see the purpose for this 'reasonable' limit (as it is called in the
source code). That range is well inside the 32-bit addressing space, and the
size is not restricted by any stack size or data segment restrictions.

Patch:
--- mtype_.c    2007-07-21 22:10:02.000000000 +0300
+++ mtype.c     2007-10-01 18:45:24.828125000 +0300
   -1832,8 +1832,6   
            n2 = n * d2;
            if ((int)n2 < 0)
                goto Loverflow;
-           if (n2 >= 0x1000000)        // put a 'reasonable' limit on it
-               goto Loverflow;
            if (n && n2 / n != d2)
            {
              Loverflow:

My temporary workaround:
Hex-edited the exe :P

Comparing files C:\DOWNLOADS\DMD.1.021\DMD\BIN\dmd.exe and
C:\SOFT\DMD\BIN\DMD.EXE
000086A1: 73 90
000086A2: 2B 90


--
Oct 01 2007
next sibling parent BCS <BCS pathlink.com> writes:
d-bugmail puremagic.com wrote:

 http://d.puremagic.com/issues/show_bug.cgi?id=1542
 
            Summary: static array size limitation is too restrictive
            Product: D
            Version: 1.021
           Platform: PC
         OS/Version: All
             Status: NEW
           Keywords: patch, rejects-valid
           Severity: major
           Priority: P2
          Component: DMD
         AssignedTo: bugzilla digitalmars.com
         ReportedBy: thecybershadow gmail.com
 
 
 Source:
 uint[4096][4096] myBigMap;
 
 Output:
 bug.d(1): Error: index 4096 overflow for static array
 
 Remarks:
 I do not see the purpose for this 'reasonable' limit (as it is called in the
 source code). That range is well inside the 32-bit addressing space, and the
 size is not restricted by any stack size or data segment restrictions.
 
 Patch:
 --- mtype_.c    2007-07-21 22:10:02.000000000 +0300
 +++ mtype.c     2007-10-01 18:45:24.828125000 +0300
    -1832,8 +1832,6   
             n2 = n * d2;
             if ((int)n2 < 0)
                 goto Loverflow;
 -           if (n2 >= 0x1000000)        // put a 'reasonable' limit on it
 -               goto Loverflow;
             if (n && n2 / n != d2)
             {
               Loverflow:
 
 My temporary workaround:
 Hex-edited the exe :P
 
 Comparing files C:\DOWNLOADS\DMD.1.021\DMD\BIN\dmd.exe and
 C:\SOFT\DMD\BIN\DMD.EXE
 000086A1: 73 90
 000086A2: 2B 90
 
 



Congrats, you are Nuts! (I'm not making fun of you, I'm nuts to and I 
rater enjoy the condition)
Oct 01 2007
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1542


bugzilla digitalmars.com changed:

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




------- Comment #1 from bugzilla digitalmars.com  2008-11-12 04:41 -------
The linker (optlink) fails with symbols that have more than 16Kb of static
data. It isn't an onerous restriction, as the array can be easily new'd
instead.


--
Nov 12 2008