Expression verification

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Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

Good day!
Is there a way to verify expression correctness (in fasm 1)?
E.g. something like this:

Code:

macro mova x
{
  if correct <mov x,al>
    mov x,al
  else if correct <mov x,ax>
    mov x,ax
  else if correct <mov x,eax>
    mov x,eax
  else if correct <mov x,rax>
    mov x,rax
  end if
}

It could be useful feature...

10 Jul 2018, 08:14

Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

It can be used for many purposes.
E.g. to detect operand size: https://board.flatassembler.net/topic.php?p=204948

10 Jul 2018, 08:16

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18113
Location: In your JS exploiting you and your system

revolution

There is currently no such feature for this. But there are other ways to achieve your suggested example.

11 Jul 2018, 01:04

Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

revolution, how can I do this?

12 Jul 2018, 15:46

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18113
Location: In your JS exploiting you and your system

revolution

With match, although it is much more clumsy for what you want to do. You will need to match each syntax you want to support, and perhaps also set some internal flag to indicate successful assembly so that future blocks can be skipped.

12 Jul 2018, 19:30

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 7891
Location: Kraków, Poland

Tomasz Grysztar

In fasm 1 I think EQTYPE might be a better option to detect various syntactic variants.

12 Jul 2018, 19:31

Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

Tomasz Grysztar wrote:

In fasm 1 I think EQTYPE might be a better option to detect various syntactic variants.

qutype is good instrument but sometimes it needs to many lines of code to detect correctness of expression.

20 Aug 2018, 09:08

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