Debugging Inline Variables in 10.3.2

[FredS 138]

Today was my first attempt to actually use these, but that ended once I placed a Breakpoint on one.

 

Perhaps not news to others..

 

program Project1;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  System.SysUtils;

{$INLINE OFF}

function NewBytes:TBytes;
begin
  SetLength(Result, 10);
end;

begin
  try
    /// <summary>
    ///   F9 from the Breakpoint will repeat 3 times, once for each Inline Variable
    ///   Uncomment the others to prove my point
    /// </summary>
    /// <remarks>
    ///   You can also try F7 or F8
    /// </remarks>
    var Eins := NewBytes;  // << Breakpoint
    var Zwei := NewBytes;
    var Drei := NewBytes;

//    var NochEins := NewBytes;
//    var NochZwei := NewBytes;
//    var NochDrei := NewBytes;

    writeln('Something Happened!');
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.

 

[Remy Lebeau 1396]

2 minutes ago, FredS said:

Today was my first attempt to actually use these, but that ended once I placed a Breakpoint on one.

For those of us that don't use this feature yet - what happened?

[PeterBelow 238]

27 minutes ago, FredS said:

Today was my first attempt to actually use these, but that ended once I placed a Breakpoint on one.

 

Perhaps not news to others..

 

program Project1;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  System.SysUtils;

{$INLINE OFF}

function NewBytes:TBytes;
begin
  SetLength(Result, 10);
end;

begin
  try
    /// <summary>
    ///   F9 from the Breakpoint will repeat 3 times, once for each Inline Variable
    ///   Uncomment the others to prove my point
    /// </summary>
    /// <remarks>
    ///   You can also try F7 or F8
    /// </remarks>
    var Eins := NewBytes;  // << Breakpoint
    var Zwei := NewBytes;
    var Drei := NewBytes;

//    var NochEins := NewBytes;
//    var NochZwei := NewBytes;
//    var NochDrei := NewBytes;

    writeln('Something Happened!');
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.

 

I'm surprised that you can even set a breakpoint on a variable declaration. Makes no sense in my opinion.  Could you please run to the breakpoint and switch to the CPU disassembly view to see what statement the breakpoint is actually on? I have not been able to install 10.3.2 myself yet due to trouble with the licence, so cannot test that myself.

[FredS 138]

35 minutes ago, Remy Lebeau said:

what happened

F9 stops at the line with the breakpoint as many times as there are inline variable declarations.

 

[FredS 138]

7 minutes ago, PeterBelow said:

Makes no sense in my opinion.

The inline variable is initialized by the return value of the function. Now if they function is in another unit how do you debug it?

 

[FredS 138]

9 minutes ago, PeterBelow said:

what statement the breakpoint is actually on

Project1.dpr.25: var Eins := NewBytes;  // Put a Breakpoint
0041E5AD 33C0             xor eax,eax
0041E5AF A3DC684200       mov [$004268dc],eax
0041E5B4 33C0             xor eax,eax
0041E5B6 55               push ebp
0041E5B7 68BEE64100       push $0041e6be
0041E5BC 64FF30           push dword ptr fs:[eax]
0041E5BF 648920           mov fs:[eax],esp

 

[PeterBelow 238]

Mh, not very enlightening. Looks like setting up a exception handling frame.

[Stefan Glienke 2002]

I see this many times I put a breakpoint into a line with an inline variable declaration - it looks like some debug symbol issue so the breakpoint is not set into the proper instructions but into the prologue code the inline declaration brings with it.

This can be very annoying and confusing indeed.

[PeterBelow 238]

4 hours ago, Stefan Glienke said:

I see this many times I put a breakpoint into a line with an inline variable declaration - it looks like some debug symbol issue so the breakpoint is not set into the proper instructions but into the prologue code the inline declaration brings with it.

This can be very annoying and confusing indeed.

Well, the cure is simple: do not use inline variables 😉. They are alien to the language anyway and serve no real purpose IMNSHO...

[Stefan Glienke 2002]

8 minutes ago, PeterBelow said:

They are alien to the language anyway and serve no real purpose IMNSHO...

I disagree but I am not going into yet another discussion about this.