.break/.continue in HL macros in FASM Classic

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AsmGuru62

Joined: 28 Jan 2004
Posts: 1657
Location: Toronto, Canada

AsmGuru62 16 May 2020, 16:30

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

16 May 2020, 16:30

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20401
Location: In your JS exploiting you and your system

revolution 16 May 2020, 17:57

You can use jmp

Code:

.while something
 .if
  ;...
  jmp .we_are_done
 .else
  ;...
 .endif
.endw
.we_are_done:

16 May 2020, 17:57

AsmGuru62

Joined: 28 Jan 2004
Posts: 1657
Location: Toronto, Canada

AsmGuru62 16 May 2020, 21:43

Indeed.

16 May 2020, 21:43

bitRAKE

Joined: 21 Jul 2003
Posts: 4060
Location: vpcmpistri

bitRAKE 16 May 2020, 22:28

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.

_________________
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16 May 2020, 22:28

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20401
Location: In your JS exploiting you and your system

revolution 16 May 2020, 23:41

Moved to Macroinstructions forum.

These are implemented in macros, not within the compilers internals.

16 May 2020, 23:41

Roman

Joined: 21 Apr 2012
Posts: 1821

Roman 24 Jun 2020, 08:38

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

24 Jun 2020, 08:38

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