f038d31b6c
From Neil Booth <neil@daikokuya.demon.co.uk>:
* gdb.base/bitfields.c: Correct assignments to bitfields to avoid
warnings.
194 lines
3.1 KiB
C
194 lines
3.1 KiB
C
/* Test program to test bit field operations */
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/* For non-ANSI compilers, use plain ints for the signed bit fields. However,
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whether they actually end up signed or not is implementation defined, so
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this may cause some tests to fail. But at least we can still compile
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the test program and run the tests... */
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#if !defined(__STDC__) && !defined(__cplusplus)
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#define signed /**/
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#endif
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struct fields
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{
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unsigned char uc ;
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signed int s1 : 1;
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unsigned int u1 : 1;
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signed int s2 : 2;
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unsigned int u2 : 2;
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signed int s3 : 3;
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unsigned int u3 : 3;
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signed int s9 : 9;
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unsigned int u9 : 9;
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signed char sc ;
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} flags;
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void break1 ()
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{
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}
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void break2 ()
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{
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}
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void break3 ()
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{
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}
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void break4 ()
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{
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}
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void break5 ()
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{
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}
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void break6 ()
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{
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}
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void break7 ()
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{
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}
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void break8 ()
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{
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}
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void break9 ()
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{
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}
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void break10 ()
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{
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}
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/* This is used by bitfields.exp to determine if the target understands
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signed bitfields. */
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int i;
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int main ()
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{
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/* For each member, set that member to 1, allow gdb to verify that the
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member (and only that member) is 1, and then reset it back to 0. */
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#ifdef usestubs
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set_debug_traps();
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breakpoint();
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#endif
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flags.uc = 1;
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break1 ();
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flags.uc = 0;
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flags.s1 = -1;
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break1 ();
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flags.s1 = 0;
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flags.u1 = 1;
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break1 ();
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flags.u1 = 0;
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flags.s2 = 1;
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break1 ();
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flags.s2 = 0;
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flags.u2 = 1;
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break1 ();
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flags.u2 = 0;
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flags.s3 = 1;
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break1 ();
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flags.s3 = 0;
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flags.u3 = 1;
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break1 ();
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flags.u3 = 0;
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flags.s9 = 1;
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break1 ();
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flags.s9 = 0;
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flags.u9 = 1;
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break1 ();
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flags.u9 = 0;
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flags.sc = 1;
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break1 ();
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flags.sc = 0;
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/* Fill alternating fields with all 1's and verify that none of the bits
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"bleed over" to the other fields. */
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flags.uc = 0xFF;
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flags.u1 = 0x1;
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flags.u2 = 0x3;
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flags.u3 = 0x7;
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flags.u9 = 0x1FF;
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break2 ();
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flags.uc = 0;
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flags.u1 = 0;
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flags.u2 = 0;
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flags.u3 = 0;
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flags.u9 = 0;
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flags.s1 = -1;
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flags.s2 = -1;
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flags.s3 = -1;
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flags.s9 = -1;
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flags.sc = 0xFF;
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break2 ();
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flags.s1 = 0;
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flags.s2 = 0;
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flags.s3 = 0;
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flags.s9 = 0;
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flags.sc = 0;
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/* Fill the unsigned fields with the maximum positive value and verify
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that the values are printed correctly. */
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/* Maximum positive values */
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flags.u1 = 0x1;
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flags.u2 = 0x3;
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flags.u3 = 0x7;
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flags.u9 = 0x1FF;
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break3 ();
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flags.u1 = 0;
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flags.u2 = 0;
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flags.u3 = 0;
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flags.u9 = 0;
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/* Fill the signed fields with the maximum positive value, then the maximally
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negative value, then -1, and verify in each case that the values are
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printed correctly. */
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/* Maximum positive values */
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flags.s1 = 0x0;
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flags.s2 = 0x1;
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flags.s3 = 0x3;
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flags.s9 = 0xFF;
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break4 ();
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/* Maximally negative values */
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flags.s1 = -0x1;
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flags.s2 = -0x2;
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flags.s3 = -0x4;
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flags.s9 = -0x100;
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/* Extract bitfield value so that bitfield.exp can check if the target
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understands signed bitfields. */
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i = flags.s9;
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break4 ();
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/* -1 */
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flags.s1 = -1;
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flags.s2 = -1;
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flags.s3 = -1;
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flags.s9 = -1;
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break4 ();
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flags.s1 = 0;
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flags.s2 = 0;
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flags.s3 = 0;
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flags.s9 = 0;
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return 0;
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}
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