[CLOSED] SizeOf(integer) in Delphi mode

[julkas]

From https://www.freepascal.org/docs-html/prog/progse74.html -

the type Integer is redefined as Longint

and https://wiki.lazarus.freepascal.org/Integer -

Currently, the integer type is only dependent on $mode, not on the CPU type. An integer is 16-bit in TP or FPC modes, or 32-bit in ObjFPC or Delphi modes.

But Sizeof(Integer) = 2 {$mode delphi} for atmega328p . Please, explain.

Code: Pascal  [Select][+][-]

1. ...
2. {$mode delphi}
3.  
4. var
5.   dv: Integer;
6.  
7. {$if Sizeof(dv) = 8}
8. {$info SizeOf(dv) = 8}
9. {$elseif Sizeof(dv) = 4}
10. {$info SizeOf(dv) = 4}
11. {$elseif Sizeof(dv) = 2}
12. {$info SizeOf(dv) = 2}
13. {$elseif Sizeof(dv) = 1}
14. {$info SizeOf(dv) = 1}
15. {$endif}
16. ...

Code: Text  [Select][+][-]

1. $  ppcrossavr.exe -Tembedded -Cpavr5 -Wpatmega328p -vi Blinky.lpr
2. Target OS: Embedded
3. Compiling Blinky.lpr
4. User defined: SizeOf(dv) = 2
5. Assembling blinky
6. Linking Blinky
7. 41 lines compiled, 0.1 sec, 396 bytes code, 2 bytes data
8.  

[Thaddy]

The current (trunk) documentation is better.

[ccrause]

The current (trunk) documentation is better.

As Thaddy mentioned the trunk documentation for Mode Delphi does mention that integer is CPU independent - "Inversely, it means that system.integer is always 16-bit.". Note that the online documentation is specific to FPC 3.0.4.  Anyone 

So taking this testing a bit further; below the size of integer for all modes that can compile a simple AVR test (tested on FPC 3.3.1 from 2019/11/08):

Mode	Sizeof(integer)	Sizeof(NativeInt)
FPC	2	2
Delphi	2	2
DelphiUniUnicode	2	2
TP	2	2
ObjFPC	2	2
ISO	4	2

This implies that the current documentation for Ordinal Types - Integer. Item 1 below table 3.2, is incorrect: "Every platform has a ”native” integer size, depending on whether the platform is 8-bit, 16-bit, 32-bit or 64-bit. e.g. On AVR this is 8-bit".  This hasn't been updated in trunk documentation.

[julkas]

The current (trunk) documentation is better.

As Thaddy mentioned the trunk documentation for Mode Delphi does mention that integer is CPU independent - "Inversely, it means that system.integer is always 16-bit.". Note that the online documentation is specific to FPC 3.0.4.  Anyone 

So taking this testing a bit further; below the size of integer for all modes that can compile a simple AVR test (tested on FPC 3.3.1 from 2019/11/08):

Mode	Sizeof(integer)	Sizeof(NativeInt)
FPC	2	2
Delphi	2	2
DelphiUniUnicode	2	2
TP	2	2
ObjFPC	2	2
ISO	4	2

This implies that the current documentation for Ordinal Types - Integer. Item 1 below table 3.2, is incorrect: "Every platform has a ”native” integer size, depending on whether the platform is 8-bit, 16-bit, 32-bit or 64-bit. e.g. On AVR this is 8-bit".  This hasn't been updated in trunk documentation.

OK. Thanks and SizeOf(FixedInt) in Delphi mode for atmega328p is 4 bytes.

Code: Text  [Select][+][-]

1. ...
2. {$mode delphi}
3. var
4.   dv: FixedInt;
5. ...
6.  

Code: Text  [Select][+][-]

1.  ppcrossavr.exe -Tembedded -Cpavr5 -Wpatmega328p -vi -a Blinky.lpr
2. Target OS: Embedded
3. Compiling Blinky.lpr
4. User defined: SizeOf(dv) = 4
5. Assembling blinky
6. Linking Blinky
7. 41 lines compiled, 0.2 sec, 648 bytes code, 4 bytes data