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Index > Macroinstructions > .break/.continue in HL macros in FASM Classic

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AsmGuru62



Joined: 28 Jan 2004
Posts: 1419
Location: Toronto, Canada
AsmGuru62
Hello.
I know there are some header files with the ability to break loops or jump to loop starting point, but it would be so nice to have this "out of the box". Like if I get new version of FASM - the features would be there already.

Code:
.while [numrecs] < MAX_RECS
    .if (...)
        ;
        ; want to get out of loop
        ;
        mov     [numrecs], MAX_RECS     ; had to do it instead of ".break"
                                        ; and sometimes I need the [numrecs] after the loop
    .else
        ;
        ; do something here
        ;
        inc     [numrecs]
    .endif
.endw
    
Post 16 May 2020, 16:30
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17669
Location: In your JS exploiting you and your system
revolution
You can use jmp
Code:
.while something
 .if
  ;...
  jmp .we_are_done
 .else
  ;...
 .endif
.endw
.we_are_done:    
Post 16 May 2020, 17:57
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AsmGuru62



Joined: 28 Jan 2004
Posts: 1419
Location: Toronto, Canada
AsmGuru62
Indeed.
Post 16 May 2020, 21:43
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bitRAKE



Joined: 21 Jul 2003
Posts: 3045
Location: vpcmipstrm
bitRAKE
Well for fasmg ...
Code:
; ~\fasmg\packages\x86\include\macro\if.inc

define _if..break? _break

macro _break
        jmp __ENDW
end macro    
Adding .break to .repeat/.until will require more work.

The laziest way I can think of would be to define .break at the start of each .repeat. Then a label needs to be added to _until, and restore prior definition of .break. I'd make some tests and try this out, but I've never really used the dot HLL stuff. I don't mind it, but it's just not my style.

_________________
¯\(°_o)/¯ unlicense.org
Post 16 May 2020, 22:28
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17669
Location: In your JS exploiting you and your system
revolution
Moved to Macroinstructions forum.

These are implemented in macros, not within the compilers internals.
Post 16 May 2020, 23:41
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Roman



Joined: 21 Apr 2012
Posts: 815
Roman
From INCLUDE\MACRO\IF.inc
macro .endw {
jmp __WHILE
__ENDW:
restore __ENDW
restore __WHILE }

macro break { jmp __ENDW}
In code use macro break

Code:
.while [count] < 10
         .if eax = 1
               break
         .else
               inc [count]
         .endif
.endw 

    


If .while in proc enought use ret
Code:
.while [count] < 10
         .if eax = 1
               ret
         .else
               inc [count]
         .endif
.endw 
ret
    
Post 24 Jun 2020, 08:38
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