Debugger Issue with Delphi 11.3 - Incorrect Evaluation of Breakpoint Results

[DelphiDinosaur 0]

After migrating our project from Delphi 10 to Delphi 11.3, we are experiencing a critical issue with the debugger functionality. The debugger is unable to correctly evaluate and display the result values when breakpoints are set.

Steps to Reproduce:

• Migrate a project from Delphi 10 to Delphi 11.3.
• Set a breakpoint on a function that returns a result, e.g., idx := IndexText('3', ['1', '2', '3']);.
• Run the code in the Delphi 11.3 IDE.
• Attempt to evaluate the return value of the function where the breakpoint is set, either by using a Watch or by hovering the mouse cursor over the function.

  program DelphiStrings;
  
  {$APPTYPE CONSOLE}
  
  {$R *.res}
  
  uses
    System.SysUtils,
    strutils;
  
  var idx : integer;
  begin
    try
      { TODO -oUser -cConsole Main : Insert code here }
      idx := IndexText('3',['1', '2', '3']);
      WriteLn( idx.ToString);
    except
      on E: Exception do
        Writeln(E.ClassName, ': ', E.Message);
    end;
  end.

  The debugger should correctly display the return value of the function at the breakpoint.

  Actual Result: The debugger displays random large integer numbers instead of the correct return value. This issue has been replicated on two different machines (see the screenshot for more details).
  
  Windows 11 64-bit Pro, Delphi 11.3 64-bit

 

 

Edited November 30, 2023 by DelphiDinosaur

[PeterBelow 218]

7 hours ago, DelphiDinosaur said:

After migrating our project from Delphi 10 to Delphi 11.3, we are experiencing a critical issue with the debugger functionality. The debugger is unable to correctly evaluate and display the result values when breakpoints are set.

Steps to Reproduce:

• Migrate a project from Delphi 10 to Delphi 11.3.
• Set a breakpoint on a function that returns a result, e.g., idx := IndexText('3', ['1', '2', '3']);.
• Run the code in the Delphi 11.3 IDE.
• Attempt to evaluate the return value of the function where the breakpoint is set, either by using a Watch or by hovering the mouse cursor over the function.

  
  program DelphiStrings;
  
  {$APPTYPE CONSOLE}
  
  {$R *.res}
  
  uses
    System.SysUtils,
    strutils;
  
  var idx : integer;
  begin
    try
      { TODO -oUser -cConsole Main : Insert code here }
      idx := IndexText('3',['1', '2', '3']);
      WriteLn( idx.ToString);
    except
      on E: Exception do
        Writeln(E.ClassName, ': ', E.Message);
    end;
  end.

  The debugger should correctly display the return value of the function at the breakpoint. 

 

 

Actually I would not expect that. The breakpoint is placed before the call statement to the IndexText funtion (check the assembly view) so the value of idx is unknown at that point;  you have to step over the call to the function to make the result available. If it worked in D10 I would consider it a bug there unless you have tooltip expression evaluation active, in which case the debugger may execute the call to get the result for the tooltip.

[Die Holländer 20]

Like Peter said. Check your idx AFTER the call statement.

 

Tested in Delphi 11.3

 

 

 

[DelphiDinosaur 0]

2 hours ago, PeterBelow said:

Actually I would not expect that. The breakpoint is placed before the call statement to the IndexText funtion (check the assembly view) so the value of idx is unknown at that point;  you have to step over the call to the function to make the result available. If it worked in D10 I would consider it a bug there unless you have tooltip expression evaluation active, in which case the debugger may execute the call to get the result for the tooltip.

See the screenshot again.

[DelphiDinosaur 0]

1 hour ago, Die Holländer said:

Like Peter said. Check your idx AFTER the call statement.

 

Tested in Delphi 11.3

 

See the original question and the screenshot.

 

 

[DelphiDinosaur 0]

1 hour ago, Die Holländer said:

Like Peter said. Check your idx AFTER the call statement.

 

Tested in Delphi 11.3

 

 

 

See the screenshot again.

 

[PeterBelow 218]

Well, I tried your example in D12 ( Win32 target) and the evaluator rejected the expression outright:

 

Edit: Tried same project in D11.3, same result. I suggest you delete the dproj file carried over from D10 and open the dpr in D11.3 to recreate the dproj.

Edited November 30, 2023 by PeterBelow

[Pat Foley 50]

Try this, the tool tip shows the index which can used to access the string. Done in 11.3

 

var idx : Integer;
const Nus: array of string = ['1', '2', '3'];
begin
  try
    { TODO -oUser -cConsole Main : Insert code here }
    idx := IndexText ('3',Nus);
    WriteLn( idx);
    Writeln(nus[idx]);
    Readln;

 

[Brian Evans 83]

Looks like Evaluate/Modify does not like that dynamic array syntax in the expression. Quick test moving it outside and the expression  IndexText ('3',Nums)  evaluates at the breakpoint without problems.

    const Nums : array of string = ['1','2','3'];
    idx := IndexText('3',Nums);

 

Edited November 30, 2023 by Brian Evans