http://d.puremagic.com/issues/show_bug.cgi?id=697

           Summary: No const folding on asm db,dw, etc
           Product: D
           Version: 0.177
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: clugdbug@yahoo.com.au


This code generates the error message "const init" which doesn't make much
sense.
(The "goto end" is only included to make it safe to run).
The same bug applies also to dd, ds, di, dl, de, df
(and to dw, dq, and dt, which are undocumented).
-------
void main()
{
    goto end;
    const byte z = 35;
    asm { db z; }
    end: ;
}
-------
And it would be nice if asm { db 1+2; } also worked (it currently prints "end of instruction").


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http://d.puremagic.com/issues/show_bug.cgi?id=697





------- Comment #1 from thomas-dloop@kuehne.cn  2007-01-23 06:05 -------
http://www.digitalmars.com/d/iasm.html
> db, ds, di, dl, df, dd, de
> These pseudo ops are for inserting raw data directly into the code.

The only requirement for inserting something "directly into the code" is for it to be compile time constant. This feature is especially interesting for inserting template generated code.

Added to DStress as http://dstress.kuehne.cn/run/a/asm_db_01_A.d http://dstress.kuehne.cn/run/a/asm_db_01_B.d http://dstress.kuehne.cn/run/a/asm_db_01_C.d http://dstress.kuehne.cn/run/a/asm_di_02_A.d http://dstress.kuehne.cn/run/a/asm_di_02_B.d http://dstress.kuehne.cn/run/a/asm_di_02_C.d http://dstress.kuehne.cn/run/a/asm_dl_02_A.d http://dstress.kuehne.cn/run/a/asm_dl_02_B.d http://dstress.kuehne.cn/run/a/asm_dl_02_C.d http://dstress.kuehne.cn/run/a/asm_ds_01_A.d http://dstress.kuehne.cn/run/a/asm_ds_01_B.d http://dstress.kuehne.cn/run/a/asm_ds_01_C.d

Thomas


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http://d.puremagic.com/issues/show_bug.cgi?id=697


smjg@iname.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |smjg@iname.com
           Keywords|                            |diagnostic, rejects-valid




------- Comment #2 from smjg@iname.com  2007-03-08 15:42 -------
There are two issues here: that this code fails to compile and that the mysterious message "const init" is in the compiler's repertoire.  If there's any really invalid code that triggers this error, it needs to be replaced with something that makes sense.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=697





------- Comment #3 from bugzilla@digitalmars.com  2007-10-29 00:04 -------
I can fix this particular problem (propagating const values), but generalized expressions for DB, etc., won't be supported until I get around to replacing the expression parser in the inline assembler with the full D expression parser.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=697


bugzilla@digitalmars.com changed:

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




------- Comment #4 from bugzilla@digitalmars.com  2007-11-03 21:42 -------
Fixed dmd 1.023 and 2.007


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http://d.puremagic.com/issues/show_bug.cgi?id=697


clugdbug@yahoo.com.au changed:

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




------- Comment #5 from clugdbug@yahoo.com.au  2009-04-15 05:41 -------
I'm reopening this since there are 7 dstress bugs which depend on it.

asm_db_01_C in run/a/asm_db_01_C.d
asm_di_02_A in run/a/asm_di_02_A.d
asm_di_02_C in run/a/asm_di_02_C.d
asm_dl_02_A in run/a/asm_dl_02_A.d
asm_dl_02_C in run/a/asm_dl_02_C.d
asm_ds_01_A in run/a/asm_ds_01_A.d
asm_ds_01_C in run/a/asm_ds_01_C.d


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