Array value popup display not quite right
lazarus / 12-Debugger

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440bx · 2020-01-28 18:50

Hello,

I was fiddling with bit arrays and was getting some values from GDB, I
couldn't make sense of.  I wrote the following little test program to
see what GDB would say: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 program TestBitArray; type  T1BIT = 0..1; var  BitArray  :
bitpacked array[0..8191] of T1BIT;  ByteArray : packed array[0..1023]
of byte absolute BitArray;   i   : integer;   sum : qword;  begin  sum
:= 0;  for i := low(BitArray) to high(BitArray) do  begin    inc(sum,
BitArray[i]);  end;  writeln(Sum);   sum := 0;  for i :=
low(ByteArray) to high(ByteArray) do  begin    inc(Sum,
ByteArray[i]);  end;  writeln(Sum);end.When hovering the mouse over
the BitArray variable, GDB shows that some of the elements in the
array are not zero (they should be - and are - zero.)  The Sum
variables confirm that all elements are zero even though GDB shows
some of them as not zero.

What the popup display shows is attached to this post.

I figured I'd post this as an FYI.  Also, the GDB version I'm using is
7.2, type of Debug Info is "dwarf with sets".

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julkas · 2020-01-29 10:14

Confirm. Same output.
If remove bitpacked or change to packed then GDB shows only zeroes.