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Re: [Chicken-users] More on aliasing.
From: |
Peter Keller |
Subject: |
Re: [Chicken-users] More on aliasing. |
Date: |
Mon, 8 Jul 2002 14:45:37 -0500 |
User-agent: |
Mutt/1.2i |
On Mon, Jul 08, 2002 at 03:29:54PM -0400, Anthony Carrico wrote:
> On Mon, 8 Jul 2002, Peter Keller wrote:
>
> > Well, in machine generated C code, I can see why the current method was
> > used. Since a larger code generates the C code, it knows when type problems
> > might occur and you get a warning at the meta level.
>
> True for warnings, but then only the meta compiler really knows what is
> going on. Why not pass the information down to the C compiler too, so it
> can be used for optimizations?
Well, I think the information should propogate down to the generated C
code as well for the same reasons you think so(and I think the code would
be safer, and allow for better run time checking of the objects). However,
I don't know how much work that would be for the implementors.
> Given the readability advantages, the only reason I can think of to be
> worried is if the compiler might stop using registers. Do you know if this
> is a problem? Can gcc put a register sized union into a register (assuming
> nothing needs the union's address)?
Registers? Like this?
register union foo;
That keyword is only a hint to the compiler. Some compilers don't even honor
it at all.
> > But in human written
> > code, people often use the struct+union method for this just to keep
> > everything straight both in the code and the mind.
>
> This would be useful for reading the Chicken compiler's code for the same
> reasons.
Yeah, that would be really useful..... as it stands, if I do:
(define scheme_func
(foreign-lambda int "c_func" int))
I can't set a breakpoint on scheme-func in a nice way. I have to deduce
what f<number> function name it got mapped to and then hope I get
it right.
Debugging at the ffi layer in chicken is a bit off-beat.
-pete
- [Chicken-users] More on aliasing., tonyg, 2002/07/05
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/05
- Re: [Chicken-users] More on aliasing., felix, 2002/07/05
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/05
- Re: [Chicken-users] More on aliasing., felix, 2002/07/08
- Re: [Chicken-users] More on aliasing., Anthony Carrico, 2002/07/08
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/08
- Re: [Chicken-users] More on aliasing., Anthony Carrico, 2002/07/08
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/08
- Re: [Chicken-users] More on aliasing., Anthony Carrico, 2002/07/08
- Re: [Chicken-users] More on aliasing.,
Peter Keller <=
- Re: [Chicken-users] More on aliasing., Anthony Carrico, 2002/07/08
- Re: [Chicken-users] More on aliasing., Anthony Carrico, 2002/07/08
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/08
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/08
- Re: [Chicken-users] More on aliasing., felix, 2002/07/09
- Re: [Chicken-users] More on aliasing., Peter Keller, 2002/07/09
- Re: [Chicken-users] More on aliasing., felix, 2002/07/09