converting c code to assembly code

[scopium45]

does anyone know how to convert c code to assembly code?

i really need this
thanks
sean

[NoHero]

Originally Posted by scopium45

does anyone know how to convert c code to assembly code?

i really need this
thanks
sean

Well ... this is one of the most difficult parts of writing a compiler. You must have a good sense of programming with assembler and C. You can disassembler compiled programs to look how other compilers does this job, or you can take a look at the open source compilers such as the gcc. But I can give you an example:

// 32bit code
int foo ( int x, int x )
{
    return (x + y);
}

Should result in:

foo:
   push ebp
   mov ebp, esp
   
   ; Return value expected in EAX
   mov eax, [ebp+8]    ; First parameter
   add eax, [ebp+12]  ; Second one

   pop ebp

   ret ; Somtimes it is also retf (return far)

[Hobson]

Most of compilers has option 'generate assembler source'. When you enable it and compile your files, assembly source files will be generated. However, they contain a lot of extra data, like debug info etc, and are hard to read (huh, sounds like assembler is easy to read sometimes )

[barrensoul]

some ASM is easy to read it's rather nice being able to put ASM inside the code for C++ or C for GFX programs in certain parts (if you look at the source code for the build engine ken silverman put some of the more intensive GFX parts in pure ASM)

[NoHero]

Originally Posted by Hobson

(huh, sounds like assembler is easy to read sometimes )

It's easy if you are a trained ASM reader.

[Hobson]

I mean that it is not hard to read three letters long mnemonics and not so much longer arguments, which is like ~10 characters per line. But understand a story which is hidden behind those sentences is lotta harder

[NoHero]

Originally Posted by Hobson

I mean that it is not hard to read three letters long mnemonics and not so much longer arguments, which is like ~10 characters per line. But understand a story which is hidden behind those sentences is lotta harder

Practice makes perfect

Also very difficult: Writing something heavy in Assembler (like DistributionSort) and then try to read it months ago, and try to make changes in it .