Code Comment Macro

Index > Macroinstructions > Code Comment Macro

Goto page 1, 2 Next

Author

Thread

chris

Joined: 05 Jan 2006
Posts: 62
Location: China->US->China->?

chris

This is an interesting macro(at least IMHO).
I wrote it so that I can comment out multi-lines of code like what I can do in C/C++ or other HLLs.

Code:

; comment.inc
; enable various comment styles

macro . sym
{
  ; C/C++ styles
  define first +
  irps t,sym
  \{
      match +,first
      \\{
            define first -
            match /,t \\\{ if 0 \\\}
      \\}

      define last@sym t
  \}
  match /,last@sym \{ end if\}

  ; other styles
  match ++,sym \{ if  0  \}
  match --,sym \{ end if \}

  ; braces
  match [,sym \{ if  0  \}
  match ],sym \{ end if \}

  match (,sym \{ if  0  \}
  match ),sym \{ end if \}
}

The above code defines the '.'(dot) as a macro which enables you to do things like:

Code:

; C/C++ styles
./*
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.*/

./++
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.--/

./******************
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.*********************/

; wild styles
./---------))---((--------
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.---~~~~~---------------/

./~~~~~~~~~~~~~~~~~
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.~~~~~~~~~~~~~~~~~~/

./+++++++++++++++++
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.------------------------/

; simple styles
.++
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.--

; using braces
.(
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.)                         

.[
        mov     eax,ebx
        add     eax,ecx
        jmp     lab
        push    eax
        call    ebx
.]

the tricky thing is that you can pass the special characters of assembler like +,-,*,~ etc. to fasm preprocessor as macro arguments.(based on my experience, there are also some special characters for the preprocessor like `, {}, <>, # and comma that can not be used as macro arguments). In a similar way, you can add your own styles of comments. Wink

To Tomasz: `, {}, <>, # and comma, I am not sure if all of them are listed here or there may be some mistakes. Could you complete it, thanks. Very Happy

14 Jul 2006, 08:24

Joshua

Joined: 12 Jul 2003
Posts: 56
Location: Belgium

Joshua

or a much easier version:

Code:

comment fix macro comment

Code:

comment {
blah
blahblah
blahblahblah
}

15 Jul 2006, 12:09

Ancient One

Joined: 28 Feb 2005
Posts: 55

Ancient One

how about multiline comment that can really comment ANYTHING? e.g

./*
macro incomplete {
.*/

16 Jul 2006, 07:13

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

chris: "." already has somewhat special meaning in "struc", check manual

joshua - maybe it could be improved to purge macro immeadiately after declaration

16 Jul 2006, 08:49

Joshua

Joined: 12 Jul 2003
Posts: 56
Location: Belgium

Joshua

As in:

Code:

comment fix macro __COMMENT {
end_comment fix } purge __COMMENT

Usage:

Code:

comment
  blah
  blahblah
  blahblahblah
end_comment

16 Jul 2006, 17:53

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

yup, but you can also fix "}" symbol to leave usage as it was

Code:

comment { 
... 
}

(sorry, i am lazy to write it myself, take it as excercise Wink

)

16 Jul 2006, 21:59

UCM

Joined: 25 Feb 2005
Posts: 285
Location: Canada

UCM

Then you get a problem, since any other macros will be messed up.

17 Jul 2006, 00:48

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

only those inside comments - which would be messed up with any other way mentioned here, too. maybe you forgot that you can unfix "}" back to original meaning

17 Jul 2006, 07:08

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18177
Location: In your JS exploiting you and your system

revolution

I often use 'IF 0' and 'END IF' to temporarily disable parts of code when testing. Using the macro style of commenting has too many problems for my liking. For permanent comments I always use the semi-colon.

17 Jul 2006, 07:31

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

revolution: macro style has problem with commenting macros (more precisely: texts conatining "}"). And you can't comment these with "if" anyway.

17 Jul 2006, 08:16

UCM

Joined: 25 Feb 2005
Posts: 285
Location: Canada

UCM

vid: Let's see how it would work then, "unfixing" } back to it's original meaning.

17 Jul 2006, 19:29

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

sorry, i got wrong, i tried it and now i think it isn't possible Sad

unfixing "}" is done this way: "} fix }", but i thought i can use something like "\} \fix \}" inside macro, unfortunately fasm's preprocessor works in other way (well... it is stated in manual... my bad)

17 Jul 2006, 22:23

chris

Joined: 05 Jan 2006
Posts: 62
Location: China->US->China->?

chris

Quote:

or a much easier version:

yeah, but I like the highlighting effects of the special characters and the flexibility. Unfortunately, you can not comment out macro definitions in this way either:

Code:

comment fix macro __COMMENT {
end_comment fix } purge __COMMENT

; not work
comment
   macro inner{ display 'inner' }
end_comment 

; unless you modify the inner macros
comment
  macro inner \{ display 'inner' \}
end_comment

the same thing happens for another version of using 'fix' - all because of the { or } is messed up with the macros you are trying to comment. I don't know a way to comment out the preprocessor things like macros or strucs definitions using preprocessor macros, even if the 'fix' has some priority over other preprocessor directives, as you can see, it just get messed up.

Quote:

how about multiline comment that can really comment ANYTHING? e.g

./*
macro incomplete {
.*/

well, you have to use semicolon. Basically, the comment macro works only at the assembler level, if does not prevent preprocessor from getting into the commentted parts(it does for the assembler!). IMO, I don't comment out a macro definition because if you don't use it anywhere in your code, it has nothing to do with the output file; however, if you do use it somewhere and you wanna disable it for a while, the comment macro plays the role:

Code:

macro foo { display 'I am alive!'  }
...

; still dead
./*
    foo
.*/

Quote:

chris: "." already has somewhat special meaning in "struc", check manual

you are right, I just overlooked it for the first time. Fortunately, fasm seems to "use some extra circuit" to handle the dot within a struc macro:

Code:

macro .
{
   display 'dot'
}

struc bar x
{
   . dd x
}

foobar  bar 1

the dot within a struc definition is always replaced with the name of the struc, no matter if it has already some other definitions.

In one word, the comment macro is used for the code that if it were outside this macro, it would be assembled into the output file, and not for the pure preprocessor constructions - consider the following situation:

Code:

macro prolog_comment_inside size
{
./*
   push  ebp
   mov   ebp,esp
   sub    esp,size
.*/
}

macro prolog size
{
   push  ebp
   mov   ebp,esp
   sub   esp,size
}    

start_1:
  prolog_comment_inside 16

; or

start_2:
./*
  prolog 16
.*/

the comment macro used somewhat differently in the above examples, but the rule is that both of them are used for code that will be assembled into output file. I hope this clarifies some aspects of the code comment macro.

18 Jul 2006, 03:29

Joshua

Joined: 12 Jul 2003
Posts: 56
Location: Belgium

Joshua

hmm, maybe a cleaner version would be:

Code:

comment fix rept 0

Usage:

Code:

comment {
  blah
  blahblah
  blahblahblah
}

The advantage of a macro comment is also that it gets stripped in preprocessing instead of assembler, reducing compile time.

On a side note, it doesn't appear possible to fix special chars... is it possible to change that in a future fasm version?

19 Jul 2006, 18:00

okasvi

Joined: 18 Aug 2005
Posts: 382
Location: Finland

okasvi

I dont really get it, I see this as problem for editor used to be solved, fasm already provides ';' for commenting, and IF you really need faster way to comment blocks of code, use editor that supports commenting blocks of code with ';'.

edit: I think winasm studio or w/e it's called does that, or then it was radasm, or maybe them both.

19 Jul 2006, 19:25

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo

The comment directive is supported by most other assemblers. I'm not saying that I really need it personally, but if it can't be done easily with macros, maybe Privalov should implement it natively. Smile

19 Jul 2006, 20:17

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

honestly, how often are you commenting a complex macro definition?

19 Jul 2006, 22:06

Nikolay Petrov

Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria

Nikolay Petrov

vid wrote:

honestly, how often are you commenting a complex macro definition?

personaly i, when is need it to hide or exchange part from working code, but for this is not necessary

rugxulo wrote:

...implement it natively...

_________________
regards

25 Jul 2006, 21:37

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc

Why can't you guys just use ";" at each line? This way you also look and "inspect" that line to see if it really needs to be commented.

Let's not make Fasm bloated design, having 7 different ways to comment a piece of code (I know I exaggerate here). Wink

29 Jul 2006, 17:56

dead_body

Joined: 21 Sep 2005
Posts: 187
Location: Ukraine,Kharkov

dead_body

Quote:

Why can't you guys just use ";" at each line?

and if i must comment a page?
it will eat much of time to comment big numbers of lines.

30 Jul 2006, 06:43

Goto page 1, 2 Next

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum