totally lost

Project Infrastructure LLVM Dev List Archives
1

Dear LLVM:

I wrote a small testcase and I can compiler and run it with gcc, But with
llvm, I got weird error like the following. I really don't know what's
going on. Could you explain? Thanks a lot -Jerry

Error Message:
xli3|csil-suna38|~/mp2|[25]% llvmgcc testcase3.c
testcase3.c: In function `init':
testcase3.c:5: warning: cast to pointer from integer of different size
/usr/dcs/projects/cs426/Software/gcc_install/bin/../lib/gcc-lib/llvm/3.1/as:
/var/tmp//cc7nkKdc.s:428: Redefinition of value named 'reg213' in the 'int
*' type plane!

My code:
/* --------------------testcase -----------------------*/
#include <stdio.h>
int *init(int size)
{
        int *a = (int *)malloc(size);
        return a;
}
int main()
{
        int *c;
        c = init(5);
        printf("c[1]=%d\n", c[1]);
        free( c );
        return;
}

2

shouldn't the malloc() be something like malloc(sizeof(int)*size)?

You're allocating 5 bytes, which is probably not the size of an int in
llvm (it's definitely not the size of an int in sparc), and later
you're trying to access c[1], which starts at byte 4 but is out of
bounds.

3

shouldn't the malloc() be something like malloc(sizeof(int)*size)?

You're allocating 5 bytes, which is probably not the size of an int in
llvm (it's definitely not the size of an int in sparc), and later
you're trying to access c[1], which starts at byte 4 but is out of
bounds.

It's true that it's not semantically correct code (whatever that means),
but it _should_ compile. I can reproduce the problem here, so I'll look
into what it will take to fix it.

-Chris

> Dear LLVM:
>
> I wrote a small testcase and I can compiler and run it with gcc, But with
> llvm, I got weird error like the following. I really don't know what's
> going on. Could you explain? Thanks a lot -Jerry
>
> Error Message:
> xli3|csil-suna38|~/mp2|[25]% llvmgcc testcase3.c
> testcase3.c: In function `init':
> testcase3.c:5: warning: cast to pointer from integer of different size
> /usr/dcs/projects/cs426/Software/gcc_install/bin/../lib/gcc-lib/llvm/3.1/as:
> /var/tmp//cc7nkKdc.s:428: Redefinition of value named 'reg213' in the 'int
> *' type plane!
>
> My code:
> /* --------------------testcase -----------------------*/
> #include <stdio.h>
> int *init(int size)
> {
> int *a = (int *)malloc(size);
> return a;
> }
> int main()
> {
> int *c;
> c = init(5);
> printf("c[1]=%d\n", c[1]);
> free( c );
> return;
> }
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev@cs.uiuc.edu http://llvm.cs.uiuc.edu
> http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev
>

              Juan Nicolas Ruiz | Dept. of Computer Science
Quidquid latine dictum sit, altum viditur. | Univ. of Illinois
(Whatever is said in Latin sounds profound)| #213 CSL, +1-217-244-1134

_______________________________________________
LLVM Developers mailing list
LLVMdev@cs.uiuc.edu http://llvm.cs.uiuc.edu
http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev

-Chris