flat assembler
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Index > Compiler Internals > Variable "parenthesis_stack"

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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
Compilation of the file, where the forefront looks this way "[bits 32]" is ending with most often hanging the computer instead of with information about the mistake. It is taking place, when parenthesis_stack<>0. Most easily it is possible to confirm the mistake using FASM for DOS.
Post 04 Oct 2009, 14:43
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17341
Location: In your JS exploiting you and your system
revolution
Can you please provide a short piece of code that demonstrates the problem.
Post 04 Oct 2009, 14:45
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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
Example code

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smaller is better


Last edited by CandyMan on 23 Oct 2014, 15:27; edited 1 time in total
Post 04 Oct 2009, 14:58
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17341
Location: In your JS exploiting you and your system
revolution
I am using a slightly older version and get this:
Code:
flat assembler  version 1.67.38  (100000 kilobytes memory)
test.asm [1]:
[bits 32]
error: illegal instruction.    
What version are you using and what do you get?
Post 04 Oct 2009, 15:03
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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
The mistake doesn't always appear.
Use UPX compressed FASMD/FASM under DOS.
Can be version 1.68 or 1.69.7
Post 04 Oct 2009, 15:15
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Tomasz Grysztar



Joined: 16 Jun 2003
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Location: Kraków, Poland
Tomasz Grysztar
I'm not able to reproduce the problem, is the UPX compression a requirement?
Post 04 Oct 2009, 16:07
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CandyMan



Joined: 04 Sep 2009
Posts: 311
Location: film "CandyMan" directed through Bernard Rose OR Candy Shop
CandyMan
The problem lies in the not-initiated variable "parenthesis_stack"
At first recompile fasm with
parenthesis_stack dd -1
and later compile test.asm
Post 04 Oct 2009, 16:20
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7734
Location: Kraków, Poland
Tomasz Grysztar
OK, got it.
Perhaps having it UPX-ed helped to make this area not zeroed at startup, and thus helped catching this bug. Thanks for the report. Release with fix is coming out in a few minutes.
Post 04 Oct 2009, 16:33
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