• Derek Parnell <derek psych.ward> May 30 2005
• "Walter" <newshound digitalmars.com> May 31 2005
• Thomas Kuehne <thomas-dloop kuehne.this-is.spam.cn> Jun 01 2005

Derek Parnell <derek psych.ward> writes:

Given the program below ...

[test.d]
<code>
debug(1) import std.stdio;
const int anything = -1000; // Line #2
dchar[] SomeFunc( dchar[] pText, out int pStopPosn)
{
    if (pText.length == 0)
        pStopPosn = 0;
    else
        pStopPosn = -1;
    debug(1) writefln("DEBUG: using '%s' we get %d", pText, pStopPosn);
    return pText.dup;
}

int main(char[][] pArgs)
{
    int sp;

    SomeFunc("123", sp);
    debug(1) writefln("DEBUG: got %d", sp);
    assert(sp == -1);

    SomeFunc("", sp);
//    if (sp != 0){} // Line #22
    debug(1) writefln("DEBUG: got %d", sp);
    assert(sp == -1);
    return 0;
}
</code>

and compiled with "dmd test.d" version 0.125, the last assert() fails to
crash the program. However, if you comment out line #2 *or* uncomment line
#22, the program works as expected - that is, the assert catches the
mistake.

You can compile with -debug to take a look at the returned data and this
shows that it is being set correctly, its just that assert() doesn't seem
to see the most recent value.

I chopped down this example from a 3,600 line program so its taken a long
while to isolate the offending conditions.

-- 
Derek
Melbourne, Australia
31/05/2005 11:09:36 AM

"Walter" <newshound digitalmars.com> writes:

Sorry about that. It'll get fixed next update.

Thomas Kuehne <thomas-dloop kuehne.this-is.spam.cn> writes:

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Hash: SHA1

Derek Parnell schrieb am Tue, 31 May 2005 11:19:42 +1000:
 Given the program below ...

 [test.d]
<code>
 debug(1) import std.stdio;
 const int anything = -1000; // Line #2
 dchar[] SomeFunc( dchar[] pText, out int pStopPosn)
 {
     if (pText.length == 0)
         pStopPosn = 0;
     else
         pStopPosn = -1;
     debug(1) writefln("DEBUG: using '%s' we get %d", pText, pStopPosn);
     return pText.dup;
 }

 int main(char[][] pArgs)
 {
     int sp;

     SomeFunc("123", sp);
     debug(1) writefln("DEBUG: got %d", sp);
     assert(sp == -1);

     SomeFunc("", sp);
 //    if (sp != 0){} // Line #22
     debug(1) writefln("DEBUG: got %d", sp);
     assert(sp == -1);
     return 0;
 }
</code>

 and compiled with "dmd test.d" version 0.125, the last assert() fails to
 crash the program. However, if you comment out line #2 *or* uncomment line
 #22, the program works as expected - that is, the assert catches the
 mistake.

 You can compile with -debug to take a look at the returned data and this
 shows that it is being set correctly, its just that assert() doesn't seem
 to see the most recent value.

 I chopped down this example from a 3,600 line program so its taken a long
 while to isolate the offending conditions.


Added to DStress as
http://dstress.kuehne.cn/norun/a/assert_10_A.d
http://dstress.kuehne.cn/norun/a/assert_10_B.d
http://dstress.kuehne.cn/norun/a/assert_10_C.d
http://dstress.kuehne.cn/norun/a/assert_10_D.d


Thomas


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