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digitalmars.D.bugs - [Issue 12306] New: Struct Enums cannot be read at compile time

reply d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=12306

           Summary: Struct Enums cannot be read at compile time
           Product: D
           Version: D2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: jbinero gmail.com



---
Created an attachment (id=1337)
Example Code - "dmd main.d"

When a struct enum is defined like this, it's values cannot be read at compile
time. 
        enum Point3D point = {x:1, y:1, z:1};
        int testArray[point.x][point.y][point.z]; // z Cannot be read at
compile time (will error 6 times)

Working (well, technically not working) code in attachment. Tested for both 32
bit and 64 bit on a Linux system.

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next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=12306




---


 Created an attachment (id=1337) [details]
 Example Code - "dmd main.d"
 
 When a struct enum is defined like this, it's values cannot be read at compile
 time. 
         enum Point3D point = {x:1, y:1, z:1};
         int testArray[point.x][point.y][point.z]; // z Cannot be read at
 compile time (will error 6 times)
 
 Working (well, technically not working) code in attachment. Tested for both 32
 bit and 64 bit on a Linux system.


Probably not important, but it errors 5 times and not 6. With adding and
removing to the code I have found inconsistency in how many times it errors,
and what variable it picks though.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Vladimir Panteleev <thecybershadow gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thecybershadow gmail.com



01:28:20 EET ---
Looks like the compiler parses the array declaration as an associative array
(and conservatively assumes that "point.x" is a type), then when it realizes it
is in fact a static array, it does not reparse the whole "point.x" expression
correctly (it just looks at the last symbol, x). Making it clear that it is an
expression, e.g. adding "+0", also fixes compilation.

Fixing this is not trivial as the expression that the compiler sees in the
array index is not saved. I think the correct fix would be to switch the
parsing order: Assume that the array "index" is an expression, then, if it
resolves to a type, reinterpret the whole thing as an associative array.

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Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, rejects-valid



https://github.com/D-Programming-Language/dmd/pull/3379

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Mar 13 2014
prev sibling next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=12306




Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/d6de735b9ac60e85b4fdd844f838fa5fb2bc0881
fix Issue 12306 - Struct Enums cannot be read at compile time

https://github.com/D-Programming-Language/dmd/commit/0edabb313e4170a62693b4e0f1f5336a5f000c86


Issue 12306 - Struct Enums cannot be read at compile time

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Mar 14 2014
prev sibling parent d-bugmail puremagic.com writes:
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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich gmail.com
         Resolution|                            |FIXED


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