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x64 vs x86 storing function pointers
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Author
Topic: x64 vs x86 storing function pointers (Read 989 times)
daobh
Newbie
Posts: 3
x64 vs x86 storing function pointers
«
on:
April 18, 2021, 09:34:13 pm »
Sorry if this is obvious, I've been searching and fiddling and I can't seem to figure it out...
In delphi 5, I can do something like this
Code: Pascal
[Select]
[+]
[-]
var
someprocedure
:
procedure
;
somefunction
:
function
(
a
:
integer
)
:
boolean
;
procedure
LoadAPI
(
var
T
)
;
var
Table
:
array
[
0
..
1
]
of
Pointer
absolute
T
;
begin
someprocedure
:
=
Table
[
0
]
;
somefunction
:
=
Table
[
1
]
;
end
;
But FP balks at the assignments (someprocedure := Table[0]) Is there a simple way to massage this to work or just the verbose route of...
Code: Pascal
[Select]
[+]
[-]
type
someprocedureType
=
procedure
;
somefunctionType
=
function
(
a
:
integer
)
:
boolean
;
var
someprocedure
:
someprocedureType
;
somefunction
:
somefunctionType
;
procedure
LoadAPI
(
var
T
)
;
var
Table
:
array
[
0
..
1
]
of
Pointer
absolute
T
;
begin
someprocedure
:
=
someprocedureType
(
Table
[
0
]
)
;
somefunction
:
=
somefunctionType
(
Table
[
1
]
)
;
end
;
Logged
Jonas Maebe
Hero Member
Posts: 1059
Re: x64 vs x86 storing function pointers
«
Reply #1 on:
April 18, 2021, 09:37:27 pm »
If you use {$mode delphi}, it should compile in FPC as well. In FPC syntax modes, plain pointers are indeed not type-compatible with procedural variables for increased type safety.
Logged
daobh
Newbie
Posts: 3
Re: x64 vs x86 storing function pointers
«
Reply #2 on:
April 18, 2021, 11:16:50 pm »
I'll work on that direction a bit, I tried delphi but was using ObjFPC instead since it ended up getting a little further. Will back track and play around though! Thanks!
Logged
daobh
Newbie
Posts: 3
Re: x64 vs x86 storing function pointers
«
Reply #3 on:
April 19, 2021, 04:56:08 am »
Using -Mdelphi worked after I cleaned up a couple of other minor issues.
- functions declaring var result. commented out.
- some usage of byte(hi(XX)) changed to byte(hi(word(XX))), untested but compiling
Thanks again!
Logged
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x64 vs x86 storing function pointers
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