[SOLVED] Problem with HeapTrc
lazarus / 12-Debugger

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Phoenix · 2019-07-13 13:05

Hello,
I detected a problem and tried to isolate it in a minimal test
application.
Always reproducible error (computer restarted for clean memory)

Configuration:
Windows 10 64bit
Lazarus 2.0.2 FPC 3.0.4 64bit

The problem only occurs if the following option is active:
Project options -> Debugging -> "Use Heaptrc unit (check for mem-
leaks) (-gh)"

I attach the source for the test and the images of the error.

I could use the alternative commented code but the other one seems
correct to me.


Any help is welcome

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ASerge · 2019-07-13 14:30

Quote from: Phoenix on July 13, 2019, 03:05:12 pmI could use the
alternative commented code but the other one seems correct to me.
Code error. SizeOf(ARows) = SizeOf(Pointer). Judging by the
screenshot, it is a 64-bit program, i.e. it is 8 bytes. But the length
of the ARows is only 1 byte.

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totya · 2019-07-13 14:31

Your code:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TEST_ERROR;Var //i: Integer;  ARows: array of
Byte;begin SetLength(ARows,1); try 
FillChar(ARows[0],SizeOf(ARows),0);   //for i:= Low(ARows) to
High(ARows) do  // ARows[i]:= 0; finally  SetLength(ARows,0); end;end;
See it:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
FillChar(ARows[0], SizeOf(ARows[0]) * Length(ARows), 0);

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Phoenix · 2019-07-13 14:44

Thanks, in fact, really a big mistake.

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totya · 2019-07-13 14:48

Quote from: Phoenix on July 13, 2019, 04:44:10 pmThanks, in fact,
really a big mistake. 

If you use non-stardand variable operations, I mean when you use
direct memory access, then you must be careful.