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From: Michael S
Newsgroups: comp.lang.c
Subject: Re: tcc - first impression. Was: Baby X is bor nagain
Date: Wed, 3 Jul 2024 00:42:58 +0300
Organization: A noiseless patient Spider
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Message-ID: <20240703004258.0000265e@yahoo.com>
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On Tue, 02 Jul 2024 17:12:47 +0100
Ben Bacarisse wrote:
> Michael S writes:
>
> > On Tue, 02 Jul 2024 16:32:23 +0100
> > Ben Bacarisse wrote:
> >
> >> Michael S writes:
> >>
> >> > On Mon, 1 Jul 2024 20:09:24 +0300
> >> > Michael S wrote:
> >> >
> >> > As far as I am concerned, the most intriguing feature of tcc is
> >> > "Memory and Bound checks". Unfortunately, I was not able to make
> >> > it work. It keeps telling me "segmentation error" at first
> >> > attempt to dereference argv. Is this feature Linux-only or
> >> > 32-bit only or some other type of "only" ?
> >>
> >> The documentation says it should work on x86_64 in Windows.
> >>
> >> Can you post the code so we can compare. With this little program
> >>
> >> #include
> >>
> >> void f(int *a, int n)
> >> {
> >> printf("a[%d] == %d\n", n, a[n]);
> >> }
> >>
> >> int main(int argc, char **argv)
> >> {
> >> for (int i = 0; i <= argc; i++)
> >> if (argv[i])
> >> printf("argv[%d] == %s\n", i, argv[i]);
> >> else printf("argv[%d] is a null pointer\n", i);
> >> int a[3];
> >> f(a, 3);
> >> }
> >>
> >> I get this output:
> >>
> >> $ ./a.out 1
> >> argv[0] == ./a.out
> >> argv[1] == 1
> >> argv[2] is a null pointer
> >> 004021b9 : at ???: BCHECK: 0x7ffca6719404 is outside of the region
> >> t.c:5: by f
> >> t.c:15: by main
> >> t.c:5: at f: RUNTIME ERROR: invalid memory access
> >> t.c:15: by main
> >>
> >
> > I got plain "Segmentation fault".
> >
> > I it gets me "Segmentation fault" on something as simple as:
> >
> > #include
> > int main(int argc, char **argv)
> > {
> > printf("%p\n", argv[0]);
> > return 0;
> > }
>
> Ah. That looks like a plain "not working" then. (Presumably you get
> a reasonable-looking pointer without the -b option). What version of
> tcc?
>
0.9.27