Integer arithmetic

[ForNeVeR]

Basic integer math support along with useful infrastructural changes.

[ForNeVeR]

I can say that this PR is pretty much done. Mr. @rexim, last time we discussed it you were willing to review a bit of Naggum code. Wanna give this PR a try?

[rexim]

@ForNeVeR, Do I understand correctly that you've added support to invoke primitive .NET arithmetical instructions from naggum and the next step is gonna be to define more high-level functions like +, -, /, *, etc?

[ForNeVeR]

Well, that's a bit complicated. Look, Naggum.Assembler is a core for a low-level language. First thing you do when creating a low-level language is defining a mapping to the target machine language from your low-level language constructs. Hereby I define such mapping to primitive arithmetic instructions of our chosen target machine - CLI.

This is somewhat orthogonal to calling "functions" such as +. I don't think that Naggum.Assembler will include such functions at all. All that it will do is to assemble our low-level core language to actual .NET binaries. I still don't know whether it will expand macros (or we'll create another layer for them) and how it will interact with our current high-level Naggum.Compiler language.

And, yeah, regarding your question. That + function may conceptually be defined as a macro (expanding to the low-level instruction set I've created with this PR) or a real function (not expanded, but compiled to that low-level instruction set). Either way, + function is totally impossible without that arithmetic instructions, but currently I am not able to tell you how or when we'll have an ability to implement such functions in Naggum.

Honestly say, I even have no definition of function currently.

But you'll be able to define a method named, say, Add, and write it in terms of these new instructions, and even maybe call it using our (call ...) syntax.

[rexim]

@ForNeVeR that means I understood everything correctly from your change. I approve the PR.

[ForNeVeR]

Thanks for the review.