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flat assembler > Macroinstructions > Atempt for SEH macroses.

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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
Here is my first atempt to create simple macroses for handling exceptions.
The example use two levels of nested handlers and have some "interactiveness" to choose how to process exception.

Check the attached file. You have to compile the example with Fresh, but it needs editing of some of the standard includes. Changed files are attached too. Please read readme.txt files (they are two Smile ) for details.

Of course you can use any version of FASM, after some play with Win32 include files. The only file you actually need except example sources is "exceptions.inc"


Regards.


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Post 16 Oct 2004, 08:17
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decard



Joined: 11 Sep 2003
Posts: 1095
Location: Poland
Well, actually I have nothing to comment - you have coded try...catch statement (from C++) in assembly, it allows nesting... great work!

BTW, C++ also implements "finally" keyword, which defines a block that will be always executed (no matter if exception exists or not). I don't know if it is useful at all (you can always add common code after "endTry"), but I may be wrong.
Post 16 Oct 2004, 10:33
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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
decard wrote:
you have coded try...catch statement (from C++) in assembly


Well, I don't know how exactly is the syntax in C++, but in Delphi there are two types of exception handlers: "try...except" and "try...finally". Actually "finally" statement is looking strange for me, as far as code after "endTry" (or whatever close statement in another languages) can make the same work... maybe it is introduced because of some "structural considerations" Smile.

Regards.
Post 16 Oct 2004, 11:23
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decard



Joined: 11 Sep 2003
Posts: 1095
Location: Poland
Quote:
maybe it is introduced because of some "structural considerations"

so we don't need it in assembly language Wink
Post 16 Oct 2004, 11:27
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f0dder



Joined: 19 Feb 2004
Posts: 3170
Location: Denmark
Afaik "finally" is not part of the C++ language, but has been added as an extension by many vendors, including microsoft. Anyway: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/key_s-z_5.asp
Post 16 Oct 2004, 16:52
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beppe85



Joined: 23 Oct 2004
Posts: 181
I haven't looked at your code but you said 'Actually "finally" statement is looking strange for me, as far as code after "endTry" can make the same work'. Could I write the sample code:

Code:
call AllocMem
try
  ...
finally
  call FreeMem
end;    


It should free the object in any case, but rethrow an exception if something goes wrong.

Forget this if you have this already.
Post 26 Oct 2004, 11:32
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