Not a patch, and unfinished... I'd be interested in results of non-gcc
compilers and/or non-i386 platforms.
Will rework this once I have some more spare time.
Regards,
Carl-Daniel
--
http://www.hailfinger.org/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
struct bitfield_test_32bit {
uint32_t var1;
union {
uint32_t var2;
struct {
uint32_t bf1 :31,
bf2 :1;
};
};
union {
uint32_t var3;
struct {
uint32_t bf3 :1,
bf4 :31;
};
};
union {
uint32_t var4;
struct {
uint32_t bf5 :24,
bf6 :4,
bf7 :4;
};
};
union {
uint32_t var6;
struct {
uint32_t bf9 :1,
:30,
bf10 :1;
};
};
union {
uint32_t var7;
struct {
uint32_t :30,
bf11 :1,
bf12 :1;
};
};
};
static const unsigned char bitfield_test_32bit_testvector[24] = {
0x67, 0x45, 0x23, 0x01,
0x00, 0x00, 0x00, 0x80,
0x01, 0x00, 0x00, 0x00,
0x01, 0x23, 0x45, 0x67,
0x80, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xfc
};
/* Yes, I know, this one tests for little endianness...
* We assume that the last bit specified in a bitfield is the highest bit.
* We assume that a group of bits has the same internal order as a single
* byte, i.e. shift+mask operations of a native endianness int-type variable
* will yield the same values as a bitfield access without additional bit
* swapping.
*/
int bitfield_check(void)
{
struct bitfield_test_32bit bftest;
if (sizeof(bftest) != 24) {
printf("bitfield size broken\n");
return 1;
}
memcpy(&bftest, bitfield_test_32bit_testvector, sizeof(bftest));
/* Check if the arch is little endian. */
if (bftest.var1 != 0x01234567) {
printf("endianness unexpected\n");
/* FIXME: Check if bigendian, convert endianness before
* continuing with checks.
*/
return 1;
}
if ((bftest.bf1 != 0) || (bftest.bf2 != 1)) {
printf("bitfield bf1 broken\n");
return 1;
}
if ((bftest.bf3 != 1) || (bftest.bf4 != 0)) {
printf("bitfield bf3 broken\n");
return 1;
}
if ((bftest.bf5 != 0x452301) || (bftest.bf6 != 7) || (bftest.bf7 != 6)) {
printf("bitfield bf5 broken\n");
return 1;
}
#if 0
if (bftest. != ) {
printf(" broken\n");
return 1;
}
if ( != ) {
printf(" broken\n");
return 1;
}
if ( != ) {
printf(" broken\n");
return 1;
}
if ( != ) {
printf(" broken\n");
return 1;
}
if ( != ) {
printf(" broken\n");
return 1;
}
#endif
return 0;
}
int main()
{
printf("%s\n", bitfield_check() ? "FAIL" : "OK");
return 0;
}
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