### Author Topic: Library in an appvar?  (Read 9049 times)

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#### Ki1o

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##### Library in an appvar?
« on: October 07, 2012, 08:10:17 pm »
Ok bear with me for this one... Is it possible to make a command library and place it an appvar?

#### cooliojazz

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##### Re: Library in an appvar?
« Reply #1 on: October 07, 2012, 08:15:23 pm »
Maybe it's just me, but i feel like you need a bit more detail before I could actually answer, it seems a bit ambiguous... But to answer your question, probably, yes.
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#### Ki1o

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##### Re: Library in an appvar?
« Reply #2 on: October 07, 2012, 08:20:21 pm »
Let me explain by example:

Say builderboy decides to makes an interactive app or something for zedd. Would it be possible to take the commands used in the original library and put them in an appvar so when the user opens the code editor (inside of the app) he/she can write out the commands and the program would still compile?

#### Deep Toaster

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##### Re: Library in an appvar?
« Reply #3 on: October 07, 2012, 09:11:43 pm »
There is no "code editor inside of the app." People writing Axe programs use the usual TI-BASIC editor (the one you get when you press PRGM and go to EDIT or NEW).

I don't know what you mean by "write out the commands," but here's a quick rundown of the types of variables Axe uses:

• Source - program

All Axe projects have a source program (the program with the code in it). These are what Axe looks for when it lists out the projects when compiling.

You can edit source programs in the TI-BASIC editor.

• Library - program

Source programs can include code from libraries with the prgm token. It basically works like #include in C or import in other languages, if you know what either of those mean.

You can edit libraries in the TI-BASIC editor. Libraries work like source programs except that they can't be compiled on their own—they need to be included into the source program.

• Axiom - appvar

Axioms are like extensions to the Axe language written in assembly. They're like libraries but in assembly instead of Axe language.

You can't edit them with the TI-BASIC editor because they're assembly code (they're made for Axe, not with Axe).

• Backup - appvar

Backups are just archived appvar copies of Axe source programs. You can create, restore, and delete them from the Axe Parser app.

• Executable - program

The executable is what the user actually runs. It's the program produced by compiling a source program, and it's what people publish for others to download.

You can't edit executables, and there's no way to get the original source or library programs used from them.

Zedd is a library—you can just get the 8XP files from the download and open the programs in the TI-BASIC editor.

« Last Edit: October 07, 2012, 09:12:08 pm by Deep Thought »

#### Ki1o

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##### Re: Library in an appvar?
« Reply #4 on: October 07, 2012, 09:47:09 pm »
Well... ummm I was thinking about the way xde had a "code editor" so people could use the app instead of the standard code editor.
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« Last Edit: October 07, 2012, 09:58:33 pm by Ki1o »

#### Deep Toaster

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##### Re: Library in an appvar?
« Reply #5 on: October 07, 2012, 10:14:14 pm »
XDE didn't "have" a code editor—it was (supposed to be) a code editor and nothing else.

You can make editors just like anything else in Axe.

#### Ki1o

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##### Re: Library in an appvar?
« Reply #6 on: October 07, 2012, 10:23:01 pm »
I'm sorry. One last question though. Back to the actual library part... could you put the commands in an appvar?

#### shmibs

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##### Re: Library in an appvar?
« Reply #7 on: October 07, 2012, 10:29:01 pm »
the commands ARE put in an appvar, but only for program backups, like he said. the programs that axe compiles are, and have to be, completely in the BASIC program format, with the exception of code inserted from axiom libraries.

#### Deep Toaster

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##### Re: Library in an appvar?
« Reply #8 on: October 07, 2012, 10:29:08 pm »
What would you do with an appvar?

#### Ki1o

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##### Re: Library in an appvar?
« Reply #9 on: October 07, 2012, 10:42:36 pm »
Forgive me for putting you through all this trouble. I was was experimenting with an idea I had in my head and I just wanted to know if it was possible. Sorry.

#### DrDnar

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##### Re: Library in an appvar?
« Reply #10 on: October 08, 2012, 01:32:19 am »
The Run Programs Axiom lets you call an external program (or a program typecast into an appvar) from an application. Axe variables aren't affected by the call. However, the transition in and out of the external code is pretty slow, an almost unavoidable* limitation of the OS.

*Yes, assembly programmers can come up with dozens of ways to get around that. None of them will integrate cleanly with Axe.
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#### thepenguin77

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##### Re: Library in an appvar?
« Reply #11 on: October 08, 2012, 08:57:07 am »
*Yes, assembly programmers can come up with dozens of ways to get around that. None of them will integrate cleanly with Axe.

That honestly stopped me from writing like 5 different examples he could use. But I agree with DrDnar, you'll have to call external programs.

But the real reason I'm posting is to clarify his question. I'm fairly certain he wants to use an appVar like a .dll. Basically, he wants so be able to use runtime libraries to that he can simply call them at will from his program.

So, to answer that question, no, you can't easily do that, and here's why:
• Where the appvars are stored, they are not executable
• The appvar would have to be pulled out of flash and stuck in ram (this is similar to what simply running it does)
• To be able to call the right routine in the appvar would absolutely require asm (and a lot of code counting)

While a runtime library axiom could in theory be created, you're best just to use libraries that go into the compiler (or just copy/paste the code). Also, you'll notice that in the past, all runtime libraries on the 84+ have been apps (xLib, Mirage, Doors, Celtic3) because apps can execute in place.
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##### Re: Library in an appvar?
« Reply #12 on: October 08, 2012, 11:59:07 am »
Forgive me for putting you through all this trouble. I was was experimenting with an idea I had in my head and I just wanted to know if it was possible. Sorry.
I don't see that it was trouble at all. It was a good question, and drew quite a few good responses.

#### Ki1o

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##### Re: Library in an appvar?
« Reply #13 on: October 08, 2012, 01:00:47 pm »
thanks you all for your responses. and the penguin77, yes that was what I was thinking about but I couldn't think of a decent explanation atm. what if instead the dll was inside of the app instead of it being an external var, would that be possible? or would I need asm for that as well?

#### thepenguin77

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##### Re: Library in an appvar?
« Reply #14 on: October 08, 2012, 02:05:12 pm »
thanks you all for your responses. and the penguin77, yes that was what I was thinking about but I couldn't think of a decent explanation atm. what if instead the dll was inside of the app instead of it being an external var, would that be possible? or would I need asm for that as well?

You could totally put it inside an app, but it's not going to be as clean as you like. You app would look like this: (asm)
Code: [Select]
 ;this is a comment ;jp is jumpstartOfApp: ;addresses jp routineA ;4080h jp routineB ;4083h jp routineC ;4086h jp routineD ;4089h jp routineE ;408ChroutineA: ;blahroutineB: ;blahroutineC: ;blah
When your axe program runs in ram, it runs in the $8000-$BFFF region (not exactly, but close enough). You can then swap the library app into the $4000-$7FFF region with a bit of asm. Then, to call your subroutines, you would simply call the addresses of their jumps. I'm not exactly sure what the mechanism is in Axe, but I know you can call absolute addresses.

The real trouble would be making that app. Maybe someone better than me with Axe knows how to put a jump table in like that, but I don't. So totally possible in theory, a bit of trouble in practice.
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