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flat assembler > Programming Language Design > fasm(g) tolerate of underscore in numbers ?

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jmg



Joined: 18 Sep 2016
Posts: 62
fasm(g) tolerate of underscore in numbers ?
In various tools, it is now more common for parsers to tolerate underscore within numbers.
This makes source more readable by spacing the fields to match the contents.

eg

MOV A,#0000_1111b
MOV A,#00_11_1111b

MOV DPTR,#1_23_4H

Can that tolerate underscore within numbers feature be added to Fasm(g) ?

I see it is already smart enough to allow all 3 common HEX formats

DEC 0x55r
DEC 55H
DEC $55
Post 19 Sep 2016, 09:02
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6301
Location: Kraków, Poland
In fasm traditionally ' character was used for this purpose:

Code:
db 0000'1111b


But supporting _ as an alternative should not cause any problems, so I may as well add it.

In the meantime, just for fun I'm going to demonstrate how to preprocess source text to convert such numbers with a macro:

Code:
macro convert_token out,token
        local t,a
      t db `token
        load a:byte from t
        if a >= '0' & a <='9'
                repeat $-t
                        load a:byte from t+%-1
                        if a = "_"
                                store "'":byte at t+%-1
                        end if
                end repeat
        end if
end macro

macro ? line&
        local buffer,command
        virtual at 0
        define out
        define buffer line
        while 1 
                match car cdrbuffer 
                        convert_token out,car 
                        match car_cdr_buffer
                                match =car,car_
                                        db ' '
                                end match
                        end match
                        define buffer cdr
                else match carbuffer
                        convert_token out,car 
                        break 
                else 
                        break 
                end match 
        end while
        load command:$ from 0
        end virtual
        eval command
end macro  


db 0000_1111b

I originally wrote a variant of this macro for shoorick to convert octal numbers ending with "Q" to ones ending with "O", but then I added support for "Q" numbers into fasmg anyway.


Last edited by Tomasz Grysztar on 19 Sep 2016, 10:36; edited 2 times in total
Post 19 Sep 2016, 10:00
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 14671
Location: Origae-6
fasm uses the single quote character (') for number separation.

fasmarm uses the more common underscore character (_) for number separation.
Post 19 Sep 2016, 10:04
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6301
Location: Kraków, Poland

revolution wrote:
fasm uses the single quote character (') for number separation.

fasmarm uses the more common underscore character (_) for number separation.

Well, I might add it into fasm, too.

Already added to fasmg.
Post 19 Sep 2016, 10:58
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 14671
Location: Origae-6

Tomasz Grysztar wrote:
Well, I might add [_] into fasm, too.

Yay.
Post 19 Sep 2016, 11:01
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jmg



Joined: 18 Sep 2016
Posts: 62

Tomasz Grysztar wrote:

Already added to fasmg.



Great Smile

Tested this, and it also fixed an issue of not allowing > 8bit binary strings.
Now, only if the number overflows the field, does an error result = Good.

flat assembler g version 0.98.1474353977

Code:

        dd (100000_0010b shl 22)
        dd (1111_1010_0101_0111_0110_0101_0100_0011b)
;       dd (1_1111_1010_0101_0111_0110_0101_0100_0011b)   ; flags, as is > 32b
        dq (1110_1111_1010_0101_0111_0110_0101_0100_0011_0010_0001b)


Post 19 Sep 2016, 19:57
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6301
Location: Kraków, Poland
To sum things up:l fasmg now supports three ways of separating groups of digits: with single quote, with underscore, or with hash - because "#" operator works with numbers as well as with symbol identifiers (and, unlike fasm 1, fasmg allows it anywhere, not only in lines generated by macros).


jmg wrote:
Tested this, and it also fixed an issue of not allowing > 8bit binary strings.
Now, only if the number overflows the field, does an error result = Good.

I think the problem must have been coming from elsewhere, since range checking in fasmg has not been changed recently or at any other time.
Post 21 Sep 2016, 17:21
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DOS386



Joined: 08 Dec 2006
Posts: 1907
I've been using $FFFF'FFFF for years with FASM Smile
Post 23 Sep 2016, 19:31
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