| /* 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" } |
| } |
| |
| } |
