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flat assembler > Programming Language Design > 386 assembly with fasm g

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idle



Joined: 06 Jan 2011
Posts: 342
Location: ukraina
command line vs the SSSO principle (same source, same output) dispute ...
Post 03 Nov 2015, 15:19
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6602
Location: Kraków, Poland

idle wrote:
command line vs the SSSO principle (same source, same output) dispute ...

I would say that fasm g is even stronger manifestation of that "SSSO principle", because in this case the source needs to contain everything, including the construction of output format. In fact, that principle becomes almost meaningless for the fasm g engine itself, because simple "building block" directives like DB obviously always behave in the same way.

On the other hand, the contents of source text that gets processed may depend on the environment, sometimes largely - because the paths to source (text or binary) files may mean different things depending on context. For this reason I think that the command line options like adding a path for included files or including some additional file/text on top of source do not break the "SSSO principle" more than INCLUDE/FILE directives already do, and this made me conclude that the principle should be revised.
Post 12 Nov 2015, 10:58
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6602
Location: Kraków, Poland
The latest package contains the ELF executable formatting macros and the self-hosting Linux version. Only the libc version does not have the self-hosting option now, but before I start working on ELF object formatting macros (if at all) I'd prefer to add the support for floats, as this would complete the list of basic features fasm g needs and with that in place I could start preparing the 1.0 release.
Post 12 Nov 2015, 11:05
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6602
Location: Kraków, Poland
I managed to progress on my road map again - the new package contains an x87 example (converted "Mandelbrot set" example from fasm 1 for DOS package) which I could finish when I finally added a support for floating-point numbers into fasm g engine. I changed the version to 0.96 to mark the fact that the set of features I wanted to have for 1.0 release is nearly complete now.
Post 30 Nov 2015, 19:00
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6602
Location: Kraków, Poland
Finally I have libc version self-hosted, too. The ELF object formatting macros that I wrote use many forward-references to construct the ELF structures, therefore it requires a few passes to resolve any ELF source, but for fasmg self-hosting it does not matter because fasmg requires 4 passes anyway. And I like that these macros demonstrate how fasm's resolving assembly works out, it also allows them to be a bit simpler and cleaner this way. To avoid multiple passes one would have to collect all the declarations of sections, global symbols and relocations, and process them in the postponed block, this would be like fasm 1 does it internally. Still, I created the ELF object formatting macros in such a way that they produce exactly the same output as fasm 1 - this way it is simpler to check the correctness of produced file.
Post 12 Jan 2016, 14:03
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