The Wiert Corner – irregular stream of stuff

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

  • My badges

  • Twitter Updates

    • RT @KittyJong1: Lees ons rapport en huiver. In 12 interviews beschrijven zorgverleners hun klachten, het gebrek aan begrip en de enorme fin… 14 minutes ago
    • @ODanaos @doetietsmettaal Slim! 17 minutes ago
    • RT @bagder: If you are a multi billion dollar company and are concerned about log4j, why not just email OSS authors you never paid anything… 3 hours ago
    • RT @hanfrish: Got mugged last night (I’m fine) Guy wanted my wallet but I couldn’t find it quick enough so he took my whole bag I walked pa… 4 hours ago
    • RT @HetVergetenKind: “Er is anderhalf jaar van mijn jeugd afgepakt en ik ben er slechter uitgekomen.” Van gesloten jeugdzorg wordt niemand… 4 hours ago
  • My Flickr Stream

  • Pages

  • All categories

  • Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 2,572 other followers

TFreedObject in FastMM4/FastMM4.pas at master · pleriche/FastMM4 · GitHub

Posted by jpluimers on 2020/01/08

Reminder to Self:

  {The class used to catch attempts to execute a virtual method of a freed
  TFreedObject = class
    procedure GetVirtualMethodIndex;
    procedure VirtualMethodError;
{$ifdef CatchUseOfFreedInterfaces}
    procedure InterfaceError;

If you encounter the class TFreedObject when doing a cast, then you’re working on a freed object and have FastMM4 enabled to detect that.

Source: [WayBackFastMM4/FastMM4.pas at master · pleriche/FastMM4 · GitHub; FastMM4 – A memory manager for Delphi and C++ Builder with powerful debugging facilities

Note that if you want to see the underlying FastMM data for any TObject allocation, use this watch (where Self is the current instance):

PFullDebugBlockHeader(PByte(Self) - SizeOf(TFullDebugBlockHeader))^

You can also put a ,r behind it to see the fields of this structure:

(Reserved1:nil; Reserved2:nil; AllocatedByRoutine:$41BF74; AllocationGroup:0; 
AllocationStackTrace:(4224198, 4233131, 4235210, 11103806, 6552132, 131126, 6597961, 11106984, 4235210, 11107153, 11104090); 
AllocatedByThread:90428; FreedByThread:90428; 
FreeStackTrace:(4241541, 131126, 4235210, 11103806, 6552132, 131126, 6597961, 11106984, 4235210, 11107153, 11104090); 
UserSize:36; PreviouslyUsedByClass:132272; HeaderCheckSum:2673350594)


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: