This is a worrying bug, and indicates a potential problem in the Framework
CLR. This bug affected a project I was working on, which behaved differently
when run from the Visual Studio IDE than when run by double clicking on the
project's EXE file. The problem can be replicated easily:
Create a new project in Visual Studio 2003 and add the following code.
Module Main
Sub Main()
Dim xmlDoc As New System.Xml.XmlD ocument
xmlDoc.AppendCh ild(xmlDoc.Crea teElement("Root "))
Dim o, n As Object
Dim count As Integer
For Each o In xmlDoc.ChildNod es
For n = 0 To 9
count += 1
Next
Next
System.Windows. Forms.MessageBo x.Show("Count: " & count)
End Sub
End Module
IMPORTANT: To replicate the bug, you must
(1) Set the project compile mode to "Release"
(2) Enable the following option: Project Configuration Properties /
Optimisations / "Remove Integer Overflow Checks"
Finally, run the program from the Visual Studio IDE. The expected message,
"Count: 10", is displayed. Now run the program from it's EXE file via
Windows Explorer. A message, "Count: 1" is displayed, which is incorrect. 3 1363
Ralph,
Interesting, that does indeed look like some kind of JIT compiler bug.
FYI, changing the loop variable n to an Integer fixes the problem. Why
did you have it declared as Object anyway?
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.
I know it fixes it, but I wanted to show the problem. Actually, changing the
code in almost any way fixes the problem.
It's a rather worrying thought that this kind arbitrary JIT compiler problem
might affect anyone's code.
So, there was no specific reason for the Object declaration, other than the
fact that I wanted to provide a simple example that did not break the
problem. (In my shipping code I used a For / Each for the inner loop, not an
object).
"Mattias Sjögren" <ma************ ********@mvps.o rg> wrote in message
news:et******** ******@TK2MSFTN GP10.phx.gbl... Ralph,
Interesting, that does indeed look like some kind of JIT compiler bug.
FYI, changing the loop variable n to an Integer fixes the problem. Why did you have it declared as Object anyway? Mattias
-- Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ Please reply only to the newsgroup.
Ralph, I know it fixes it, but I wanted to show the problem. Actually, changing the code in almost any way fixes the problem.
OK, fine. FWIW, the bug seems to be fixed in Whidbey.
It's a rather worrying thought that this kind arbitrary JIT compiler problem might affect anyone's code.
Well, there will always be bugs.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/
Please reply only to the newsgroup. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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