Code can't be generated?

flat assembler
Message board for the users of flat assembler.

Index > Compiler Internals > Code can't be generated?

Author

Thread

l4m2

Joined: 15 Jan 2015
Posts: 660

l4m2

Code:

  rept 10 i:0 {
    if ~defined int_#i
      int_#i:
        mov al,i
        iret
    end if
  }

19 Feb 2015, 10:55

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17943
Location: In your JS exploiting you and your system

revolution

See here:

http://board.flatassembler.net/topic.php?t=8328

19 Feb 2015, 11:04

l4m2

Joined: 15 Jan 2015
Posts: 660

l4m2

revolution wrote:

See here:

http://board.flatassembler.net/topic.php?t=8328

So the reason is that the definition itself made it not to define and a loop happened ?

19 Feb 2015, 11:23

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr

l4m2,

It's all about prediction. fasm uses data from previous pass to deduce whether that symbol is going to be defined.

20 Feb 2015, 20:07

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc

baldr
It is more important to understand the conceptual reasoning than the technical. Conceptually the source code makes a contradictory statement that cannot be true (a label must be defined if it's not defined and must not be defined if it is), and compilation is a process of finding such conditions that all the statements in the source are true, which is not possible in this case.

_________________
Faith is a superposition of knowledge and fallacy

20 Feb 2015, 22:31

< 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