flat assembler

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Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee 05 Oct 2011, 00:08

Hi.

I'm doing an assembler (nothing so serious - zasm is his name Razz

) in fasm assembler, of course, and I've almost done with the lexical analyzer (scanner), I would like you could test it and report me bugs. Then i can optimize the scanner before go to next step.

Here a code example:

Code:

@COM
    EXECUTE 0x21

    mov dx msg
    mov ah 0x09
    int EXECUTE

    mov ah 0x4C
    int EXECUTE

    msg db 'Hello world!$'

(More syntax here)

Notes:

Macro scanner is not yet implemented (so do not test them).
when using an address displacement (ex. mov [eax+ebx] 0) type the register name in uppercase (EAX+EBX). (this is provisory)
in the example code above if you remove the line EXECUTE 0x21 it will work with no error, remember: its a scanner step only.
the only error message displayed if a syntax is wrong is: invalid line [#]. Sorry for that . So if you get this message and cannot solve it, post here!
right now it parses all general purpose registers and the following instruction: adc, add, and, dec, inc, int, mov, or, pop, push, sub, test, xor. Do not try any other.
@PE directive or similars need at least one session (ex. @code) in order to work with no error msg. (and do not let it empty, or... i will fix that)
Pay attention in whitespace. Some erros may happen because of them. I do not yet parse them in all places, for example, in expressions (2+2 ok; 2 + 2 error!). But i'm doing.. help me find them

How to use
Type a test.asm code file and drop it to zasm.exe. Or use command line if you like.

Please, test it! Thanks

Description:	new version with some bugfixes	Download
Filename:	zasm_v0.0.1.7z
Filesize:	2.1 KB
Downloaded:	720 Time(s)

_________________
Sorry if bad english.

Last edited by Teehee on 06 Oct 2011, 20:39; edited 1 time in total

05 Oct 2011, 00:08

addes3

Joined: 09 May 2011
Posts: 29

addes3 06 Oct 2011, 00:04

I saw this on google code a while ago. The reference labels look a lot better then FASM's @F and @B.

06 Oct 2011, 00:04

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 06 Oct 2011, 01:01

addes3 wrote:

I saw this on google code a while ago. The reference labels look a lot better then FASM's @F and @B.

But which one is better ? Rolling Eyes

06 Oct 2011, 01:01

Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee 06 Oct 2011, 08:43

No feedback yet?? perhaps there is no errors?! impossible Laughing

, come on guys, help me!!

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Sorry if bad english.

06 Oct 2011, 08:43

emc

Joined: 20 Aug 2011
Posts: 90
Location: France

emc 06 Oct 2011, 16:33

I saw this too, and I have posted a comment about "<" labels. I said it's cool to write "(30<)" instead "<<< ... <<<" 30 times. Do you saw? (long ago) Wink

06 Oct 2011, 16:33

Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee 06 Oct 2011, 20:41

i did and answered you Wink

i've found some bugs in my scanner right now (on unknow instructions), i'm working to fix them.

***

*edit* Note: I've just upload a new version with some bug fixes, please download it again.

_________________
Sorry if bad english.

06 Oct 2011, 20:41

addes3

Joined: 09 May 2011
Posts: 29

addes3 06 Oct 2011, 22:57

What exactly does this do? Tell us if there are errors?
All I get is "Press any key to continue . . ."

06 Oct 2011, 22:57

Teehee

Joined: 05 Aug 2009
Posts: 570
Location: Brazil

Teehee 06 Oct 2011, 23:53

addes3 wrote:

What exactly does this do? Tell us if there are errors?
All I get is "Press any key to continue . . ."

it will analyze your code input for valid syntax. If you saw "press any key to continue..." that means your syntax is ok. You will see 'invalid line [#]' when you make some mistake.

ex.

Code:

mov eax eax ; this line is valid, so
; output: Press any key to continue...
mov 3 eax   ; this line is invalid, so
; output: invalid line [#]

_________________
Sorry if bad english.

06 Oct 2011, 23:53

addes3

Joined: 09 May 2011
Posts: 29

addes3 07 Oct 2011, 19:33

Ohhh okay.

07 Oct 2011, 19:33

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