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Annotation of GNUtools/cc/va-spur.h, revision 1.1.1.1

1.1       root        1: /*  varargs.h for SPUR */
                      2: 
                      3: /* NB.  This is NOT the definition needed for the new ANSI proposed
                      4:    standard */
                      5:  
                      6: 
                      7: struct __va_struct { char __regs[20]; };
                      8: 
                      9: #define va_alist __va_regs, __va_stack
                     10: 
                     11: /* In GCC version 2, we want an ellipsis at the end of the declaration
                     12:    of the argument list.  GCC version 1 can't parse it.  */
                     13: 
                     14: #if __GNUC__ > 1
                     15: #define __va_ellipsis ...
                     16: #else
                     17: #define __va_ellipsis
                     18: #endif
                     19: 
                     20: /* The ... causes current_function_varargs to be set in cc1.  */
                     21: #define va_dcl struct __va_struct __va_regs; int __va_stack; 
                     22: 
                     23: typedef struct {
                     24:     int __pnt;
                     25:     char *__regs;
                     26:     char *__stack;
                     27: } va_list;
                     28: 
                     29: #define va_start(pvar) \
                     30:      ((pvar).__pnt = 0, (pvar).__regs = __va_regs.__regs, \
                     31:       (pvar).__stack = (char *) &__va_stack)
                     32: #define va_end(pvar)
                     33: 
                     34: /* Avoid errors if compiling GCC v2 with GCC v1.  */
                     35: #if __GNUC__ == 1
                     36: #define __extension__
                     37: #endif
                     38: 
                     39: #define va_arg(pvar,type)  \
                     40: __extension__ \
                     41:     ({  type __va_result; \
                     42:         if ((pvar).__pnt >= 20) { \
                     43:            __va_result = *( (type *) ((pvar).__stack + (pvar).__pnt - 20)); \
                     44:           (pvar).__pnt += (sizeof(type) + 7) & ~7; \
                     45:        } \
                     46:        else if ((pvar).__pnt + sizeof(type) > 20) { \
                     47:           __va_result = * (type *) (pvar).__stack; \
                     48:           (pvar).__pnt = 20 + ( (sizeof(type) + 7) & ~7); \
                     49:        } \
                     50:        else if (sizeof(type) == 8) { \
                     51:           union {double d; int i[2];} __u; \
                     52:           __u.i[0] = *(int *) ((pvar).__regs + (pvar).__pnt); \
                     53:           __u.i[1] = *(int *) ((pvar).__regs + (pvar).__pnt + 4); \
                     54:           __va_result = * (type *) &__u; \
                     55:           (pvar).__pnt += 8; \
                     56:        } \
                     57:        else { \
                     58:           __va_result = * (type *) ((pvar).__regs + (pvar).__pnt); \
                     59:           (pvar).__pnt += (sizeof(type) + 3) & ~3; \
                     60:        } \
                     61:        __va_result; })

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