Allow complex expressions (like C)

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 12 Nov 2010, 22:30

Hi guys,

I think that I saw it somewhere in thsi forum, but I cannot find it or maybe I was wrong. I wanted to ask if there is a way to allow complex expressions. Example:

Code:

MyProc proc 

local my_var1:DWORD, my_var2:DWORD

EBX = 0             ; instead of "mov ebx, 0"
[my_var1] = EBX  ; instead of "mov [my_var1], ebx
...

EAX = ECX + [my_var1] + EBX * 3;

MyProc endp

I know this is like C and not ASM...but was wondering if it's possible to be done in FASM

Thanks!!!

12 Nov 2010, 22:30

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 12 Nov 2010, 22:44

Please check out this tutorial on "match" directive: http://board.flatassembler.net/topic.php?p=34035#34035

As one of the examples it implements the "let" macro that allows to write things like:

Code:

let EBX = 0
let [my_var1] = EBX
let EAX += 4

but nothing more complex. However after you read it all, you should have a general idea what can be done with fasm's preprocessor capabilities. Also IRPS directive may help a bit (look at how the complex logical expression parsing is done by the PARSECOND macro in the IF.INC package).

12 Nov 2010, 22:44

ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 12 Nov 2010, 23:03

if you wish to use complex expressions like C, use C and not assembler.

_________________
I am not young enough to know everything (Oscar Wilde)-

12 Nov 2010, 23:03

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 14 Nov 2010, 12:31

Thank guys! I will think of it.

14 Nov 2010, 12:31

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