Viewing file:  Wstringop-overread-5.c (2.07 KB) -rw-r--r--
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/* Verify -Wstringop-overread with a source pointer pointing either
before the beginning or past the end of an object.
{ dg-do compile }
{ dg-options "-O -Wall -Wno-array-bounds" } */
typedef __SIZE_TYPE__ size_t;
size_t strlen (const char *);
void sink (void*, ...);
void off_sz_or_1 (size_t i)
{
i |= 1;
/* Verify the offset in the notes only mentions the meaningful lower
bound and not a range with the excessive (and meaningless) upper
bound like [2, 9223372036854775807]. */
extern char a[1];
// { dg-message "at offset 1 into source object 'a'" "note" { target *-*-* } .-1 }
// { dg-message "at offset 2 " "note" { target *-*-* } .-2 }
char *p1 = a + i;
char *p2 = p1 + 1;
char *p3 = p1 - 1;
size_t n = 0;
n += strlen (p1); // { dg-warning "reading 1 or more bytes from a region of size 0" }
n += strlen (p2); // { dg-warning "reading 1 or more bytes from a region of size 0" }
n += strlen (p3);
sink (p1, p2, p3, n);
}
void off_sz_or_2 (size_t i)
{
i |= 2;
extern char b[2];
// { dg-message "at offset 2 " "note" { target *-*-* } .-1 }
// { dg-message "at offset 3 " "note" { target *-*-* } .-2 }
char *p1 = b + i;
char *p2 = p1 + 1;
char *p3 = p1 - 1;
size_t n = 0;
n += strlen (p1); // { dg-warning "reading 1 or more bytes from a region of size 0" }
n += strlen (p2); // { dg-warning "reading 1 or more bytes from a region of size 0" }
n += strlen (p3);
sink (p1, p2, p3, n);
}
void off_sz_or_4 (size_t i)
{
i |= 4;
extern char c[3];
// { dg-message "at offset 4 " "note" { target *-*-* } .-1 }
// { dg-message "at offset 5 " "note" { target *-*-* } .-2 }
// { dg-message "at offset 3 " "note" { target *-*-* } .-3 }
char *p1 = c + i;
char *p2 = p1 + 1;
char *p3 = p1 - 1;
size_t n = 0;
n += strlen (p1); // { dg-warning "reading 1 or more bytes from a region of size 0" }
n += strlen (p2); // { dg-warning "reading 1 or more bytes from a region of size 0" }
n += strlen (p3); // { dg-warning "reading 1 or more bytes from a region of size 0" }
sink (p1, p2, p3, n);
}
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