Re: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor

On 8/4/20 9:33 AM, David Laight wrote:

quoted

quoted

If you look at the libffi reference patch I have included, the architecture
specific changes to use trampfd just involve a single C function call to
a common code function.

No idea what libffi is, but it must surely be simpler to
rewrite it to avoid nested function definitions.

Sorry if I wasn't clear.

libffi is a separate use case and GCC nested functions is a separate one.
libffi is not used to solve the nested function stuff.

For nested functions, GCC generates trampoline code and arranges to
place it on the stack and execute it.

I agree with your other points about nested function implementation.

Madhavan

Or find a book from the 1960s on how to do recursive
calls and nested functions in FORTRAN-IV.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)