Viewing file:  Wstringop-overflow-21.c (1.63 KB) -rw-r--r--
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/* PR middle-end/92312 - bogus -Wstringop-overflow storing into a trailing
array backed by larger buffer
{ dg-do compile }
{ dg-options "-O2 -Wall -Wno-array-bounds" } */
struct S0 { char a, b[0]; };
void sink (void*);
void test_memset_zero_length (void)
{
char a[3];
struct S0 *p = (struct S0*)a;
p->a = 0;
__builtin_memset (p->b, 0, 2);
sink (p);
__builtin_memset (p->b, 0, 3); // { dg-warning "\\\[-Wstringop-overflow" }
sink (p);
}
void test_store_zero_length (int i)
{
char a[3];
struct S0 *p = (struct S0*)a;
p->a = 0; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { target { vect_slp_v4qi_store_align } } }
p->b[0] = 0;
p->b[1] = 1; // { dg-bogus "\\\[-Wstringop-overflow" }
p->b[2] = 2; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { xfail { vect_slp_v4qi_store_align } } }
p->b[i] = 2;
sink (p);
}
struct Sx { char a, b[]; };
void test_memset_flexarray (int i)
{
char a[3];
struct Sx *p = (struct Sx*)a;
p->a = 0;
__builtin_memset (p->b, 0, 2);
sink (p);
__builtin_memset (p->b, 0, 3); // { dg-warning "\\\[-Wstringop-overflow" }
sink (p);
}
void test_store_flexarray (int i)
{
char a[3];
struct Sx *p = (struct Sx*)a;
p->a = 0; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { target { vect_slp_v4qi_store_align } } }
p->b[0] = 0;
p->b[1] = 1; // { dg-bogus "\\\[-Wstringop-overflow" }
p->b[2] = 1; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { xfail { vect_slp_v4qi_store_align } } }
p->b[i] = 2;
sink (p);
}
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