Re: Suggestion for function attributes on x86 architecture

[Richard Earnshaw <rearnsha at arm dot com>]

> > > __attributte__((naked)) :  indicate that the specified function do not need
> > > prologue/epilogue sequences generated by the compiler.
> > 
> > This is an ill-conceived idea that I have resisted every time
> > it comes up.  If you want this level of control, write in 
> > assembly language to begin with.
> 
> Why? This is possible for ARM architecture, why not for x86??
> Instead using complicated assembler like the below, it's  more clear
> to use c syntax:
> 
> asm(".text\n"
>     ".globl _MyFunc\n"
>     "_MyFunc:\n"
>     "ret\n");
> 
> ^ This is really ill.
> 
> Instead using 
> 
> void __naked MyFunc() {
> }
> 

I agree with Richard: It's an abomination.  It means that you can write 
things like

extern int x, y;

void __naked set_x()
{
  x = y;
}

and the compiler might, or might not, generate correct code.  There's just 
no way to tell what will work and what won't.  It can even change with 
compilation options.