freebsd-dev/contrib/gcc/ginclude/va-spur.h
Peter Wemm a4cd5630b0 Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
1996-09-18 05:35:50 +00:00

62 lines
1.6 KiB
C

/* varargs.h for SPUR */
/* NB. This is NOT the definition needed for the new ANSI proposed
standard */
struct __va_struct { char __regs[20]; };
#define va_alist __va_regs, __va_stack
/* In GCC version 2, we want an ellipsis at the end of the declaration
of the argument list. GCC version 1 can't parse it. */
#if __GNUC__ > 1
#define __va_ellipsis ...
#else
#define __va_ellipsis
#endif
/* The ... causes current_function_varargs to be set in cc1. */
#define va_dcl struct __va_struct __va_regs; int __va_stack;
typedef struct {
int __pnt;
char *__regs;
char *__stack;
} va_list;
#define va_start(pvar) \
((pvar).__pnt = 0, (pvar).__regs = __va_regs.__regs, \
(pvar).__stack = (char *) &__va_stack)
#define va_end(pvar) ((void)0)
/* Avoid errors if compiling GCC v2 with GCC v1. */
#if __GNUC__ == 1
#define __extension__
#endif
#define va_arg(pvar,type) \
__extension__ \
(*({ type *__va_result; \
if ((pvar).__pnt >= 20) { \
__va_result = ( (type *) ((pvar).__stack + (pvar).__pnt - 20)); \
(pvar).__pnt += (sizeof(type) + 7) & ~7; \
} \
else if ((pvar).__pnt + sizeof(type) > 20) { \
__va_result = (type *) (pvar).__stack; \
(pvar).__pnt = 20 + ( (sizeof(type) + 7) & ~7); \
} \
else if (sizeof(type) == 8) { \
union {double d; int i[2];} __u; \
__u.i[0] = *(int *) ((pvar).__regs + (pvar).__pnt); \
__u.i[1] = *(int *) ((pvar).__regs + (pvar).__pnt + 4); \
__va_result = (type *) &__u; \
(pvar).__pnt += 8; \
} \
else { \
__va_result = (type *) ((pvar).__regs + (pvar).__pnt); \
(pvar).__pnt += (sizeof(type) + 3) & ~3; \
} \
__va_result; }))