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// Skip if not target: i?86-*-linux*
// Special g++ Options: -malign-double
// Origin: Alex Samuel <samuel@codesourcery.com>
/* Test the layout of bitfields in C aggretagtes for compliance with
the IA-64 ABI. */
#include <cstring>
template<typename T>
inline unsigned
alignmentof ()
{
struct S
{
char start_;
T object_;
};
return (unsigned) & ((S *) 0)->object_;
}
/* Computes the alignment, in bytes, of TYPE. */
#define alignof(type) (alignmentof<type> ())
/* Returns true iff all the bits in the range
START_BIT <= bit < START_BIT + NUM_BITS, and only those bits, are
set in the region of memory starting at BUF of LENGTH bytes. */
bool
check_bits (char *buf,
unsigned length,
unsigned start_bit,
unsigned num_bits)
{
for (unsigned bit = 0; bit < 8 * length; ++bit) {
bool is_set = (buf[bit / 8] & (1 << (bit % 8))) != 0;
if (start_bit <= bit && bit < start_bit + num_bits) {
if (! is_set)
return false;
}
else {
if (is_set)
return false;
}
}
return true;
}
/* Creates a variable of type AGGREGATE, sets FIELD to -1, and
verifies that NUM_BITS bits starting at START_BIT, and no other
bits, are set. If the check fails, returns with value RVAL. */
#define CHECK_FIELD(AGGREGATE, FIELD, START_BIT, NUM_BITS, RVAL) \
do { \
AGGREGATE a__; \
std::memset (& a__, 0, sizeof (a__)); \
a__.FIELD = -1; \
if (! check_bits ((char *) & a__, sizeof (a__), START_BIT, NUM_BITS)) \
return RVAL; \
} while (0);
/* Structs S1, S2, S3, S4, and union U5 are taken from Intel, "IA-64
Software Conventions and Runtime Architecture Guide", version of
August 1999. */
struct S1
{
int j : 5;
int k : 6;
int m : 7;
};
#ifdef HAVE_IA64_TYPES
struct S2
{
short s : 9;
__int64 j : 9;
char c ;
short t : 9;
short u : 9;
char d ;
};
#endif /* HAVE_IA64_TYPES */
struct S3
{
char c ;
short s : 8;
};
union U4
{
char c ;
short s : 8;
};
struct S5
{
char c ;
int : 0;
char d ;
short : 9;
char e ;
char : 0;
};
int
main ()
{
if (sizeof (struct S1) != 4)
return 1;
if (alignof (struct S1) != 4)
return 2;
CHECK_FIELD (S1, j, 0, 5, 3);
CHECK_FIELD (S1, k, 5, 6, 4);
CHECK_FIELD (S1, m, 11, 7, 5);
#ifdef HAVE_IA64_TYPES
if (sizeof (struct S2) != 16)
return 6;
if (alignof (struct S2) != 8)
return 7;
CHECK_FIELD (S2, s, 0, 9, 8);
CHECK_FIELD (S2, j, 9, 9, 9);
CHECK_FIELD (S2, c, 24, 8, 10);
CHECK_FIELD (S2, t, 32, 9, 11);
CHECK_FIELD (S2, u, 48, 9, 12);
CHECK_FIELD (S2, d, 64, 8, 13);
#endif /* HAVE_IA64_TYPES */
if (sizeof (struct S3) != 2)
return 14;
if (sizeof (struct S3) != 2)
return 15;
CHECK_FIELD (S3, c, 0, 8, 16);
CHECK_FIELD (S3, s, 8, 8, 17);
if (sizeof (union U4) != 2)
return 18;
if (alignof (union U4) != 2)
return 19;
CHECK_FIELD (U4, c, 0, 8, 20);
CHECK_FIELD (U4, s, 0, 8, 21);
if (sizeof (struct S5) != 9)
return 22;
if (alignof (struct S5) != 1)
return 23;
CHECK_FIELD (S5, c, 0, 8, 24);
CHECK_FIELD (S5, d, 32, 8, 25);
CHECK_FIELD (S5, e, 64, 8, 26);
return 0;
}
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