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

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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2
Code:
  rept 10 i:0 {
    if ~defined int_#i
      int_#i:
        mov al,i
        iret
    end if
  }     
Post 19 Feb 2015, 10:55
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17664
Location: In your JS exploiting you and your system
revolution
Post 19 Feb 2015, 11:04
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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2


So the reason is that the definition itself made it not to define and a loop happened ?
Post 19 Feb 2015, 11:23
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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.
Post 20 Feb 2015, 20:07
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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
Post 20 Feb 2015, 22:31
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