Viewing file:  Wstringop-overflow-44.c (2.35 KB) -rw-r--r--
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/* PR middle-end/97175 - ICE on an excessive strncpy bound
{ dg-do compile }
{ dg-options "-O -Wall" } */
int n;
char *d;
void sink (void*);
/* Exercise calls with a destination of unknown size. */
void f0 (const void *s)
{
if (n > 0) return;
__builtin_memcpy (d, s, n); // eliminated
}
void f1 (const void *s)
{
if (n > 0) return;
__builtin_memmove (d, s, n); // eliminated
}
void f2 (void)
{
if (n > 0) return;
__builtin_memset (d, 0, n); // eliminated
}
void f3 (const char *s)
{
if (n > 0) return;
__builtin_strncpy (d, s, n); // can be eliminated but isn't
}
void f4 (const char *s)
{
if (n > 0) return;
*d = 0;
__builtin_strncat (d, s, n); // can be eliminated but isn't
}
/* Exercise the same calls but with a declared destination object. */
void g0 (const void *s)
{
if (n > 0) return;
char a[1];
__builtin_memcpy (a, s, n); // eliminated
sink (a);
}
void g1 (const void *s)
{
if (n > 0) return;
char a[1];
__builtin_memmove (a, s, n); // eliminated
sink (a);
}
void g2 (void)
{
if (n > 0) return;
char a[1];
__builtin_memset (a, 0, n); // eliminated
sink (a);
}
void g3 (const char *s)
{
if (n > 0) return;
char a[1];
__builtin_strncpy (a, s, n); // can be eliminated but isn't
sink (a);
}
void g4 (const char *s)
{
if (n > 0) return;
char a[1];
*a = 0;
__builtin_strncat (a, s, n); // can be eliminated but isn't
sink (a);
}
void h0 (const void *s)
{
if (n > 0) return;
d = __builtin_malloc (1);
__builtin_memcpy (d, s, n); // eliminated
}
void h1 (const void *s)
{
if (n > 0) return;
d = __builtin_malloc (1);
__builtin_memmove (d, s, n); // eliminated
}
void h2 (void)
{
if (n > 0) return;
d = __builtin_malloc (1);
__builtin_memset (d, 0, n); // eliminated
}
void h3 (const char *s)
{
if (n > 0) return;
d = __builtin_malloc (1);
__builtin_strncpy (d, s, n); // can be eliminated but isn't
}
void h4 (const char *s)
{
if (n > 0) return;
d = __builtin_malloc (1);
*d = 0;
__builtin_strncat (d, s, n); // can be eliminated but isn't
}
/* The calls above that aren't eliminated trigger
warning: specified size between INT_MAX and SIZE_MAX exceed maximum
object size PTRDIFF_MAX
{ dg-prune-output "-Wstringop-overflow" }
{ dg-prune-output "-Wstringop-overread" } */
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