Viewing file:  Wstring-compare-3.c (2.89 KB) -rw-r--r--
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/* PR middle-end/95673 - missing -Wstring-compare for an impossible strncmp test
{ dg-do compile }
{ dg-options "-O2 -Wall -Wstring-compare -Wno-stringop-overread -ftrack-macro-expansion=0" } */
typedef __SIZE_TYPE__ size_t;
extern int strcmp (const char*, const char*);
extern int strncmp (const char*, const char*, size_t);
void sink (int, ...);
extern char a3[3];
int nowarn_strcmp_one_use_ltz (int c)
{
const char *s = c ? "1234" : a3;
int n = strcmp (s, "123");
return n < 0;
}
int nowarn_strcmp_one_use_eqnz (int c)
{
const char *s = c ? "12345" : a3;
int n = strcmp (s, "123");
return n == 1;
}
int warn_strcmp_one_use_eqz (int c)
{
const char *s = c ? "123456" : a3;
int n = strcmp (s, "123"); // { dg-warning "'strcmp' of a string of length 3 and an array of size 3 evaluates to nonzero" }
return n == 0; // { dg-message "in this expression" }
}
int warn_strcmp_one_use_bang (int c)
{
const char *s = c ? "1234567" : a3;
int n = strcmp (s, "123"); // { dg-warning "'strcmp' of a string of length 3 and an array of size 3 evaluates to nonzero" }
return !n; // { dg-message "in this expression" }
}
int warn_strcmp_one_use_bang_bang (int c)
{
const char *s = c ? "12345678" : a3;
int n = strcmp (s, "123"); // { dg-warning "'strcmp' of a string of length 3 and an array of size 3 evaluates to nonzero" }
return !!n; // { dg-message "in this expression" }
}
_Bool warn_one_use_bool (int c)
{
const char *s = c ? "123456789" : a3;
int n = strcmp (s, "123"); // { dg-warning "'strcmp' of a string of length 3 and an array of size 3 evaluates to nonzero" }
return (_Bool)n; // { dg-message "in this expression" }
}
int warn_strcmp_one_use_cond (int c)
{
const char *s = c ? "1234567890" : a3;
int n = strcmp (s, "123"); // { dg-warning "'strcmp' of a string of length 3 and an array of size 3 evaluates to nonzero" }
return n ? 3 : 5; // { dg-message "in this expression" }
}
int nowarn_strcmp_multiple_uses (int c)
{
const char *s = c ? "1234" : a3;
int n = strcmp (s, "123");
sink (n < 0);
sink (n > 0);
sink (n <= 0);
sink (n >= 0);
sink (n + 1);
return n;
}
int warn_strcmp_multiple_uses (int c)
{
const char *s = c ? "12345" : a3;
int n = strcmp (s, "123"); // { dg-warning "'strcmp' of a string of length 3 and an array of size 3 evaluates to nonzero" }
sink (n < 0);
sink (n > 0);
sink (n <= 0);
sink (n >= 0);
sink (n == 0); // { dg-message "in this expression" }
return n;
}
int warn_strncmp_multiple_uses (int c)
{
const char *s = a3;
int n = strncmp (s, "1234", 4); // { dg-warning "'strncmp' of a string of length 4, an array of size 3 and bound of 4 evaluates to nonzero" }
sink (n < 0);
sink (n > 0);
sink (n <= 0);
sink (n >= 0);
sink (n == 0); // { dg-message "in this expression" }
return n;
}
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