Re: [Tinycc-devel] Unify C and asm symbols

[grischka]

Michael Matz wrote:
> Hi,
>
> On Sat, 25 Nov 2017, Michael Matz wrote:
>
> > Hmm, let's see ... I'm fairly sure to have the .def file problem fixed 
> > later today.  The symtab unification I don't know yet, perhaps end of 
> > the weekend or next week.
>
> Both in mob now.  I've tested 32bit and 64bit linux; some proper Windows 
> testing would be nice.  (I've also checked in your improved variant of 
> the asm-c-connect test)

I like it.  More lines removed than added could mean that it is
going in the right direction anyway ;)

From 'git log --shortstat'

    tccasm: Unify C and asm symbol table
    8 files changed, 165 insertions(+), 189 deletions(-)

Question:  I wonder whether now we could maybe get rid of the asm label
"post-processing" (asm_free_labels) and the asm_label stack altogether?

Seen that it can be counter-productive too, as with for example:

t1.c:
    int main_2();

    int main() {
        asm("call x5");
        return main_2();
    }

    int x5() {
        printf("x5\n");
        return 5;
    }

t2.c:
    int main_2() {
        x5();
        return 0;
    }

$ tcc -c t1.c t2.c && tcc t1.o t2.o -o t.exe && t.exe
tcc: error: undefined symbol 'x5'

$ tcc -c t1.c && objdump -x t1.o
    SYMBOL TABLE:
    00000000 l    df *ABS*      00000000 t1.c
    0000004a l       .text      0000001f x5

Here 'x5' should have the g[lobal] binding from C.

--- grischka