206 lines
6.7 KiB
C
206 lines
6.7 KiB
C
/* PR 71831 - __builtin_object_size poor results with no optimization
|
|
Verify that even without optimization __builtin_object_size returns
|
|
a meaningful result for a subset of simple expressins. In cases
|
|
where the result could not easily be made to match the one obtained
|
|
with optimization the built-in was made to fail instead. */
|
|
/* { dg-do run } */
|
|
/* { dg-options "-O0" } */
|
|
|
|
static int nfails;
|
|
|
|
#define TEST_FAILURE(line, obj, type, expect, result) \
|
|
__builtin_printf ("FAIL: line %i: __builtin_object_size(" \
|
|
#obj ", %i) == %zu, got %zu\n", \
|
|
line, type, expect, result), ++nfails
|
|
|
|
#define bos(obj, type) __builtin_object_size (obj, type)
|
|
#define size(obj, n) ((size_t)n == X ? sizeof *obj : (size_t)n)
|
|
|
|
#define test(expect, type, obj) \
|
|
do { \
|
|
if (bos (obj, type) != size (obj, expect)) \
|
|
TEST_FAILURE (__LINE__, obj, type, size (obj, expect), bos (obj, type)); \
|
|
} while (0)
|
|
|
|
#define T(r0, r1, r2, r3, obj) \
|
|
do { \
|
|
test (r0, 0, obj); \
|
|
test (r1, 1, obj); \
|
|
test (r2, 2, obj); \
|
|
test (r3, 3, obj); \
|
|
} while (0)
|
|
|
|
/* For convenience. Substitute for 'sizeof object' in test cases where
|
|
the size can vary from target to target. */
|
|
#define X (size_t)0xdeadbeef
|
|
|
|
/* __builtin_object_size checking results are inconsistent for equivalent
|
|
expressions (see bug 71831). To avoid having duplicate the inconsistency
|
|
at -O0 the built-in simply fails. The results hardcoded in this test
|
|
are those obtained with optimization (for easy comparison) but without
|
|
optimization the macros below turn them into expected failures . */
|
|
#if __OPTIMIZE__
|
|
# define F0(n) n
|
|
# define F1(n) n
|
|
# define F2(n) n
|
|
# define F3(n) n
|
|
#else
|
|
# define F0(n) -1
|
|
# define F1(n) -1
|
|
# define F2(n) 0
|
|
# define F3(n) 0
|
|
#endif
|
|
|
|
typedef __SIZE_TYPE__ size_t;
|
|
|
|
extern char ax[];
|
|
char ax2[]; /* { dg-warning "assumed to have one element" } */
|
|
|
|
extern char a0[0];
|
|
static char a1[1];
|
|
static char a2[2];
|
|
static char a9[9];
|
|
|
|
#if __SIZEOF_SHORT__ == 4
|
|
extern short ia0[0];
|
|
static short ia1[1];
|
|
static short ia9[9];
|
|
#elif __SIZEOF_INT__ == 4
|
|
extern int ia0[0];
|
|
static int ia1[1];
|
|
static int ia9[9];
|
|
#elif __SIZEOF_LONG__ == 4
|
|
extern long ia0[0];
|
|
static long ia1[1];
|
|
static long ia9[9];
|
|
#endif
|
|
|
|
static char a2x2[2][2];
|
|
static char a3x5[3][5];
|
|
|
|
struct Sx { char n, a[]; } sx;
|
|
struct S0 { char n, a[0]; } s0;
|
|
struct S1 { char n, a[1]; } s1;
|
|
struct S2 { char n, a[2]; } s2;
|
|
struct S9 { char n, a[9]; } s9;
|
|
|
|
struct S2x2 { char n, a[2][2]; } s2x2;
|
|
struct S3x5 { char n, a[3][5]; } s3x5;
|
|
|
|
static __attribute__ ((noclone, noinline)) void
|
|
test_arrays ()
|
|
{
|
|
T ( -1, -1, 0, 0, ax);
|
|
|
|
T ( 0, 0, 0, 0, a0);
|
|
T ( 1, 1, 1, 1, ax2);
|
|
|
|
T ( 1, 1, 1, 1, a1);
|
|
T ( 2, 2, 2, 2, a2);
|
|
T ( 9, 9, 9, 9, a9);
|
|
|
|
T ( 0, 0, 0, 0, a0);
|
|
T ( 1, 1, 1, 1, ax2);
|
|
|
|
T ( 0, 0, 0, 0, ia0);
|
|
T ( 4, 4, 4, 4, ia1);
|
|
T ( 36, 36, 36, 36, ia9);
|
|
|
|
/* Not all results for multidimensional arrays make sense (see
|
|
bug 77293). The expected results below simply reflect those
|
|
obtained at -O2 (modulo the known limitations at -O1). */
|
|
T ( 4, 4, 4, 4, a2x2);
|
|
T ( 4, 4, 4, 4, &a2x2[0]);
|
|
T ( 4, 2, 4, 2, &a2x2[0][0]);
|
|
T ( 0, F1 (0), 0, 0, &a2x2 + 1);
|
|
T ( 2, F1 ( 2), 2, F3 ( 2), &a2x2[0] + 1);
|
|
T ( 3, F1 ( 1), 3, F3 ( 3), &a2x2[0][0] + 1);
|
|
|
|
T ( 15, 15, 15, 15, a3x5);
|
|
T ( 15, 5, 15, 5, &a3x5[0][0] + 0);
|
|
T ( 14, F1 ( 4), 14, F3 (14), &a3x5[0][0] + 1);
|
|
|
|
T ( 1, 1, 1, 1, a1 + 0);
|
|
T ( 0, F1 (0), 0, 0, a1 + 1);
|
|
T ( 0, F1 ( 0), 0, 0, &a1 + 1);
|
|
/* In the following the offset is out of bounds which makes
|
|
the expression undefined. Still, verify that the returned
|
|
size is zero (and not some large number). */
|
|
T ( 0, F1 (0), 0, 0, a1 + 2);
|
|
|
|
T ( 2, 2, 2, 2, a2 + 0);
|
|
T ( 1, F1 ( 1), 1, F3 ( 1), a2 + 1);
|
|
T ( 0, F1 ( 0), 0, 0, a2 + 2);
|
|
}
|
|
|
|
static __attribute__ ((noclone, noinline)) void
|
|
test_structs (struct Sx *psx, struct S0 *ps0, struct S1 *ps1, struct S9 *ps9)
|
|
{
|
|
/* The expected size of a declared object with a flexible array member
|
|
is sizeof sx in all __builtin_object_size types. */
|
|
T ( X, X, X, X, &sx);
|
|
|
|
/* The expected size of an unknown object with a flexible array member
|
|
is unknown in all __builtin_object_size types. */
|
|
T ( -1, -1, 0, 0, psx);
|
|
|
|
/* The expected size of a flexible array member of a declared object
|
|
is zero. */
|
|
T ( 0, 0, 0, 0, sx.a);
|
|
|
|
/* The expected size of a flexible array member of an unknown object
|
|
is unknown. */
|
|
T ( -1, -1, 0, 0, psx->a);
|
|
|
|
/* The expected size of a declared object with a zero-length array member
|
|
is sizeof sx in all __builtin_object_size types. */
|
|
T ( X, X, X, X, &s0);
|
|
|
|
/* The expected size of an unknown object with a zero-length array member
|
|
is unknown in all __builtin_object_size types. */
|
|
T ( -1, -1, 0, 0, ps0);
|
|
|
|
/* The expected size of a zero-length array member of a declared object
|
|
is zero. */
|
|
T ( 0, 0, 0, 0, s0.a);
|
|
|
|
/* The expected size of a zero-length array member of an unknown object
|
|
is unknown. */
|
|
T ( -1, -1, 0, 0, ps0->a);
|
|
|
|
T ( X, X, X, X, &s1);
|
|
T ( 1, 1, 1, 1, s1.a);
|
|
T ( 0, F1 (0), 0, 0, s1.a + 1);
|
|
|
|
/* GCC treats arrays of all sizes that are the last member of a struct
|
|
as flexible array members. */
|
|
T ( -1, -1, 0, 0, ps1);
|
|
T ( -1, -1, 0, 0, ps1->a);
|
|
T ( -1, -1, 0, 0, ps1->a + 1);
|
|
|
|
T ( X, X, X, X, &s9);
|
|
T ( 9, 9, 9, 9, s9.a);
|
|
T ( 9, 9, 9, 9, s9.a + 0);
|
|
T ( 8, F1 ( 8), 8, F3 ( 8), s9.a + 1);
|
|
T ( 7, F1 ( 7), 7, F3 ( 7), s9.a + 2);
|
|
T ( 0, F1 ( 0), 0, F3 ( 0), s9.a + 9);
|
|
|
|
/* The following make little sense but see bug 77301. */
|
|
T ( -1, -1, 0, 0, ps9);
|
|
T ( -1, -1, 0, 0, ps9->a);
|
|
T ( -1, -1, 0, 0, ps9->a + 1);
|
|
}
|
|
|
|
int
|
|
main()
|
|
{
|
|
test_arrays ();
|
|
|
|
test_structs (&sx, &s0, &s1, &s9);
|
|
|
|
if (nfails)
|
|
__builtin_abort ();
|
|
|
|
return 0;
|
|
}
|