Hi!
Are you willing to consider discussing/taking patches that reduce the
variety and complexity of C constructs used in TinyCC source code?
I have a list of about 20 unpolished patches[0] for constructs like:
comma operator
- p[0] = x & 255, p[1] = x >> 8 & 255;
+ p[0] = x & 255; p[1] = x >> 8 & 255;
or (heterogeneous) initialzer lists
- uint8_t buf[1000], *p = buf;
+ uint8_t buf[1000];
+ uint8_t *p = buf;
or function return derefencing
- v = tok_alloc(astr.data, astr.size - 1)->tok;
+ TokenSym *tk = tok_alloc(astr.data, astr.size - 1);
+ v = tk->tok;
or complex field access
- return table_ident[v]->sym_define;
+ TokenSym *t = table_ident[v];
+ Sym *s = t->sym_define;
+ return s;
or even struct by value assign
- vtop->type = *type;
+ memcpy (&vtop->type, type, sizeof (CType));
that allow tcc to be compiled with a simpler C compiler, so that in time
we could add to README something like
- BOOTSTRAPPABLE! Because tcc uses only a subset of C99 (C99--), it
can be bootstrapped with a simple C compiler.
Knowing[1] that TinyCC can build Gcc (wow!) and building tcc is easier
than building gcc, it is a good candidate for use in a bootstrap path.
The past couple of months I have been working to bootstrap tcc using
mescc, a simple C compiler that can (almost) be bootstrapped from
source. I have just released[2] Mes 0.10 which can compile a modified
version of mes-tcc, which can compile a trivial C program into a working
executable.
Much work will have to be done before mes-tcc will be able to build a
functional Gcc. I would like to start by reducing the delta on tcc that
I'm carrying.
What do you think, is bootstrappable builds[4] something you would want
to support and what could C99-- look like?
Greetings,
janneke
[0] https://gitlab.com/janneke/tinycc/commits/wip-mescc
[1] https://lists.gnu.org/archive/html/tinycc-devel/2017-05/msg00099.html
[2] http://lists.gnu.org/archive/html/guile-user/2017-09/msg00027.html
[3] http://bootstrappable.org
--
Jan Nieuwenhuizen <jann...@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com
_______________________________________________
Tinycc-devel mailing list
Tinycc-devel@nongnu.org
https://lists.nongnu.org/mailman/listinfo/tinycc-devel
