Need ASM to make BF compiler...

This is a discussion on Need ASM to make BF compiler... within the Tech Board forums, part of the Community Boards category; hello, duno where to put this thread, so i'm putting this here. i need some basic asm knowledge and a ...

  1. #1
    Registered User Devils Child's Avatar
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    Need ASM to make BF compiler...

    hello,
    duno where to put this thread, so i'm putting this here.

    i need some basic asm knowledge and a minimalistic compiler in order to create a simple BF compiler. so far, i've done it in c#, but that's not the way to go...

    i just need a console with simple i/o written in ASM.
    i've tried MASM and NASM without any results as there are no tutorials, especially no ones with console i/o

    what i need is simple character input & output and a small compiler with commandline.

    thanks.

  2. #2
    Reverse Engineer maxorator's Avatar
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    It would make more sense to write it in C and use inline assembly where necessary. However, I doubt assembly is necessary at all.
    "The Internet treats censorship as damage and routes around it." - John Gilmore

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    Registered User Devils Child's Avatar
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    well i could compile it to C code, but how do i compile C code?

    i could generate the C code myself, but i would need a C compiler which I can call easily and also redistribute...
    Last edited by Devils Child; 03-28-2010 at 08:46 AM.

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    Registered User Devils Child's Avatar
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    i found one. "tcc" seems to be a good compiler. it seems to be working.
    thanks.

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    You can call C standard library functions (printf, scanf, etc) from asm. Just link it to some driver C code.

    driver.c
    Code:
    int asm_main();
    
    int main() {
         return asm_main();
    }
    Then you can write the asm_main (or _asm_main, depending on your OS) function in assembly, assemble into an object file (say asm_main.o), then

    Code:
    gcc -o my_program driver.c asm_main.o
    Then you can use all C standard library functions, as long as you follow the calling convention.

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    Or just link the object file generated by assembler against -lc. You don't have to add some useless C code. If you use assembler used by your C compiler, you can even use your C compiler driver to compile your assembly and call linker for you with right flags.

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    Are you sure that will work? Doesn't the C compiler insert things into beginning of main? (that's why main cannot be called by your own code)

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    Registered User Devils Child's Avatar
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    so far, i'm generating C code and compiling it with the tcc compiler.
    there's one thing left to do: how do I assign an icon the the exe file? are there any linkers? can tcc do it?

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    Quote Originally Posted by cyberfish View Post
    Are you sure that will work? Doesn't the C compiler insert things into beginning of main? (that's why main cannot be called by your own code)
    Yes, when program written in C is started, execution starts at entry point, _start by default among elven people, which gets argc and argv and environment and calls main with them. It doesn't do anything magical needed by -lc. If you need your command line arguments, you can fetch them, or call your main function main, link appropriate files (or let your C compiler do this) and let crt do the fetching. However, at least on *BSD you need to have symbols environ and __progname, don't remember about Solaris, haven't done anything like this on other operating systems (and only on SPARC).

    And I just realised I was stupid and didn't remember you could also assemble with your favourite assembler and use your C compiler only for linking.

  10. #10
    Just a pushpin. bernt's Avatar
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    Wow, funny thing really, I was just looking at BF programs today (I do suppose you're talking about Brainf***, right?). And the whole point of BF was to make the smallest compiler for a turing-complete language possible - the smallest one I've seen is ~160 bytes. That's why all the BF compilers are in ASM.

    there's one thing left to do: how do I assign an icon the the exe file? are there any linkers? can tcc do it?
    I'll assume you're using windows since you asked - in linux you can set icons through the file manager, and mac... well, I don't know.

    You'll have to learn the Windows API, and how to use resources, and... well, it's a lot of work just for that little icon.
    Consider this post signed

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    Registered User Devils Child's Avatar
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    well, it's a lot of work just for that little.....
    that's why i'm coding in C# and not in C++. you're not able to acomplish little things you could do in C# with a few lines of code.

    i already had that kind of problem with linked resourced. i asked in this forum. i managed to add a binary resource file for one use, but for the other purpose, i wasn't able to add an icon...


    btw: i'm calling my derivate "Brain........++"

    HelloWorld:
    Code:
    #inc <stdio.bf>
    
    // This function prints hello world
    _hello
      [-]>[-]>[-]>[-]>[-]<<<<++++++++++[
      >+++++++>++++++++++>+++>+<<<<-]>++
      .>+.+++++++..+++.>++.<<+++++++++++
      ++++.>.+++.------.--------.>+.>.
    _ret
    
    // Main entry point
    _main
      //Print ASCII characters
      [-]+[.+]
    
      //Hello world
      //Also call the "br" function from stdio.bf for line breaks
      (br)(br)(br)(hello)(br)(br)
    
      //Now decimal numbers using stdio functions
      [-]+[(dec)+>[-]++++++++++++++++++++++++++++++++.<]
    _ret
    it's downloadable here: http://www.dev-ch.de/upload/files/De...d/bfpp0.92.zip

  12. #12
    Just a pushpin. bernt's Avatar
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    that's why i'm coding in C# and not in C++. you're not able to acomplish little things you could do in C# with a few lines of code.
    Oh, sorry - the string of previous posts made me think you were making the compiler in C rather than using a C#-written program to convert BF to C.

    So I suppose the problem here is that you need to set an icon for the produced binary (the one you coded in BF, converted to C, and compiled with TCC) and not for the compiler. I still don't know any way to do that other than including <windows.h> and making a resource file.
    Consider this post signed

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    Registered User Devils Child's Avatar
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    in previous versions, i used to compile BF code to C# code. the C# compiler is simple and redistributed with every .NET framework. setting an icon is not too hard, but now that i'm using C as language to convert to, it's hard...
    what do you mean by include windows.h and making a res file? can i accomplish that using my compiler?

  14. #14
    Just a pushpin. bernt's Avatar
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    Ok, turns out you don't have to #include <windows.h>, my mistake. Here is an explanation of how - all it involves is creating a .rc file, which compiles (with a "resource compiler") and then you link to the compiled resource file.

    There's a resource compiler here.

    Unfortunately tcc doesn't support linking to .res files. However, it appears as though the compiler I linked to can make .o files from the .rc's; that should be no problem for tcc. However, I'm really shooting in the dark - I haven't tried this myself. But at least it's a start.
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    Registered User Devils Child's Avatar
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    ok. i created the .rc file with resource hacker, the .res and .obj file with that resource compiler and how tried to link it to my exe using the linker from their site

    http://www.dev-ch.de/upload/files/De.../Screen340.jpg

    it created an executable which is not working or somehow crappy...
    i guess i could use that linker for my compiler, but how?

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