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/* PR tree-optimization/101397 - spurious warning writing to the result
of stpcpy minus 1
Verify warnings for indexing into a pointer returned from stpncpy.
The call stpncpy(S1, S2, N) returns the address of the copy of
the first NUL is it exists or &S1[N] otherwise.
{ dg-do compile }
{ dg-options "-O2 -Wall -Wno-stringop-truncation" } */
typedef __SIZE_TYPE__ size_t;
void* calloc (size_t, size_t);
char* stpncpy (char*, const char*, size_t);
void sink (int, ...);
extern char ax[], a3[3], a5[5], a7[7], a9[9], *s;
volatile int x;
/* Verify warnings for indexing into the result of stpncpy with a source
pointing to an array of unknown bound. */
void test_stpncpy_from_ptr (int i, int n)
{
{
// P is in [ax, ax + 5].
char *p = stpncpy (ax, s, 5);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-5], p[-1], p[0], p[9]);
}
{
// P is in [a5, a5 + 3].
char *p = stpncpy (a5, s, 3);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[ 1], p[ 2], p[ 3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
// P is in [ax, ax + 4].
char *p = stpncpy (a5, s, 4);
x = p[-5]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[ 1], p[ 2], p[ 3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
// P is in [ax, ax + 5].
char *p = stpncpy (a5, s, n);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-5], p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[ 1], p[ 2], p[ 3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
// P is in [ax, ax + 4].
char *p = stpncpy (a5, s, 4);
if (i > -1) i = -1;
x = p[i];
if (i > -2) i = -2;
x = p[i];
if (i > -3) i = -3;
x = p[i];
if (i > -4) i = -4;
x = p[i];
if (i > -5) i = -5;
x = p[i]; // { dg-warning "\\\[-Warray-bounds" }
}
}
/* Verify warnings for indexing into the result of stpncpy with a source
an array of size 5. */
void test_stpncpy_from_a5 (int i, int n, int n3_9)
{
{
// The returned pointer is in [ax, ax + 3].
char *p = stpncpy (ax, a5, 3);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0], p[1], p[99]);
}
{
// The returned pointer is in [ax, ax + 5].
char *p = stpncpy (ax, a5, 5);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
x = p[-5];
x = p[-1];
x = p[ 0];
x = p[ 9];
}
{
//The returned pointer is in [ax, ax + 5] even though n is not known.
char *p = stpncpy (ax, a5, n);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-5], p[-4], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[9], p[99]);
}
{
// The returned pointer is in [a3, a3 + 3].
char *p = stpncpy (a3, a5, 3);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[ 1], p[ 2]);
x = p[ 3]; // { dg-warning "\\\[-Warray-bounds" }
}
{
// The returned pointer is in [a3, a3 + 3].
char *p = stpncpy (a3, a5, n);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[ 1], p[ 2]);
x = p[ 3]; // { dg-warning "\\\[-Warray-bounds" }
}
{
if (n3_9 < 3 || 9 < n3_9)
n3_9 = 3;
// The returned pointer is in [a3, a3 + 3].
char *p = stpncpy (a3, a5, n3_9);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[ 1], p[ 2]);
x = p[ 3]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *p = stpncpy (a3, a5, 3);
if (i > -1) i = -1;
x = p[i];
if (i > -2) i = -2;
x = p[i];
if (i > -3) i = -3;
x = p[i];
if (i > -4) i = -4;
x = p[i]; // { dg-warning "\\\[-Warray-bounds" }
}
}
/* Verify warnings for indexing into the result of stpncpy with a source
an array of size 7. */
void test_stpncpy_from_a7 (int i, int n, int n3_9)
{
{
// The returned pointer is ax + 5.
char *p = stpncpy (ax, a7, 5);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
x = p[-5];
x = p[-1];
x = p[ 0];
x = p[ 9];
}
{
//The returned pointer is in [ax, ax + 7] even though n is not known.
char *p = stpncpy (ax, a7, n);
x = p[-8]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-7], p[-6], p[-5], p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9]);
}
{
// The returned pointer is in [a5, a5 + 3].
char *p = stpncpy (a5, a7, 3);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
// The returned pointer is a5 + 4.
char *p = stpncpy (a5, a7, 4);
x = p[-5]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
// The returned pointer is in [a5, a5 + 5].
char *p = stpncpy (a5, a7, n);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-5], p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
if (n3_9 < 3 || 9 < n3_9)
n3_9 = 3;
// The returned pointer is in [a5, a5 + 5].
char *p = stpncpy (a5, a7, n3_9);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-5], p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4]);
x = p[ 5]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *p = stpncpy (a5, a7, 4);
if (i > -1) i = -1;
x = p[i];
if (i > -2) i = -2;
x = p[i];
if (i > -3) i = -3;
x = p[i];
if (i > -4) i = -4;
x = p[i];
if (i > -5) i = -5;
x = p[i]; // { dg-warning "\\\[-Warray-bounds" }
}
}
void test_stpncpy_from_a5_to_allocated (int i, int n, int n5_7, int n3_9)
{
if (n5_7 < 5 || 7 < n5_7)
n5_7 = 5;
{
char *d = calloc (n5_7, 1);
char *p = stpncpy (d, s, n);
x = p[-8]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-7], p[-6], p[-5], p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6]);
x = p[7]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *d = calloc (n5_7, 1);
char *p = stpncpy (d, a3, n);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6]);
x = p[7]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *d = calloc (n5_7, 1);
char *p = stpncpy (d, a5, n);
x = p[-6]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-5], p[-4], p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6]);
x = p[7]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *d = calloc (n5_7, 1);
char *p = stpncpy (d, a9, n);
x = p[-8]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-7], p[-6], p[-5], p[-3], p[-4], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6]);
x = p[7]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *d = calloc (n5_7, 1);
char *p = stpncpy (d, a3, n3_9);
x = p[-4]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-3], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6]);
x = p[7]; // { dg-warning "\\\[-Warray-bounds" }
}
{
char *d = calloc (n5_7, 1);
char *p = stpncpy (d, a9, n3_9);
x = p[-8]; // { dg-warning "\\\[-Warray-bounds" }
sink (p[-7], p[-6], p[-5], p[-4], p[-4], p[-2], p[-1], p[0]);
sink (p[1], p[2], p[3], p[4], p[5], p[6]);
x = p[7]; // { dg-warning "\\\[-Warray-bounds" }
}
}
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