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From: Michael S
Newsgroups: comp.lang.c
Subject: Re: tcc - first impression. Was: Baby X is bor nagain
Date: Tue, 2 Jul 2024 18:45:18 +0300
Organization: A noiseless patient Spider
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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;
}