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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Delphi still doesn’t raise overflow exception on Int64 multiplication…

Posted by jpluimers on 2018/06/28

Thanks to Stefan Glienke for pointing me at the below patch for [WayBack] Why doesn’t raise overflow exception on multiplication example or how to detect in this case?{$RANGECHECKS ON} {$OVERFLOWCHECKS ON}varvalue: Int64;… – Rafael Dipold – Google+.

It’s basically an issue in __llmulo that has been documented but not solved since “forever”:

some people “some while ago” reported this and even posted a solution: [WayBackhttp://qc.embarcadero.com/wc/qcmain.aspx?d=34049

And there it is again: [WayBackhttp://qc.embarcadero.com/wc/qcmain.aspx?d=119146

And most recently: https://quality.embarcadero.com/browse/RSP-16617

FWIW here is a runtime patch that corrects this (using the version posted in QC#119146): https://pastebin.com/jzLgYeqm

The bug tracking of the Delphi team is so bad, that some of the reports actually mark this issue “As Designed” like in [WayBackhttp://qc.embarcadero.com/wc/qcmain.aspx?d=118287

The below patch requires rights to call [WayBackWriteProcessMemory as documented in [WayBackHow to Read and Write Other Process Memory.

–jeroen

Patch at [WayBack] https://pastebin.com/jzLgYeqm

 

 

 

3 Responses to “Delphi still doesn’t raise overflow exception on Int64 multiplication…”

  1. rvelthuis said

    As others said, it was fixed. I reported https://quality.embarcadero.com/browse/RSP-16617 and I checked it regularly. It is fixed.

  2. Marco Cantu said

    As https://quality.embarcadero.com/browse/RSP-16617 indicates it was fixed in 10.2 Tokyo

  3. HeartWare said

    It sems to have been fixed in 10.2.3

    VAR
    I : Int64;

    BEGIN
    {$Q+}
    I:=Int64.MaxValue; I:=I*2;
    END;

    produces an integer overflow exception…

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