include/stdarg.h

   1 #ifndef _STDARG_H
   2 #define _STDARG_H
   3
   4 #ifdef __x86_64__
   5 #ifndef _WIN64
   6 #include <stdlib.h>
   7
   8 /* GCC compatible definition of va_list. */
   9 struct __va_list_struct {
  10     unsigned int gp_offset;
  11     unsigned int fp_offset;
  12     union {
  13         unsigned int overflow_offset;
  14         char *overflow_arg_area;
  15     };
  16     char *reg_save_area;
  17 };
  18
  19 typedef struct __va_list_struct *va_list;
  20
  21 /* we use __builtin_(malloc|free) to avoid #define malloc tcc_malloc */
  22 /* XXX: this lacks the support of aggregated types. */
  23 #define va_start(ap, last)                                              \
  24     (ap = (va_list)__builtin_malloc(sizeof(struct __va_list_struct)),   \
  25      *ap = *(struct __va_list_struct*)(                                 \
  26          (char*)__builtin_frame_address(0) - 16),                       \
  27      ap->overflow_arg_area = ((char *)__builtin_frame_address(0) +      \
  28                               ap->overflow_offset),                     \
  29      ap->reg_save_area = (char *)__builtin_frame_address(0) - 176 - 16  \
  30         )
  31 #define va_arg(ap, type)                                        \
  32     (*(type*)(__builtin_types_compatible_p(type, long double)   \
  33               ? (ap->overflow_arg_area += 16,                   \
  34                  ap->overflow_arg_area - 16)                    \
  35               : __builtin_types_compatible_p(type, double)      \
  36               ? (ap->fp_offset < 128 + 48                       \
  37                  ? (ap->fp_offset += 16,                        \
  38                     ap->reg_save_area + ap->fp_offset - 16)     \
  39                  : (ap->overflow_arg_area += 8,                 \
  40                     ap->overflow_arg_area - 8))                 \
  41               : (ap->gp_offset < 48                             \
  42                  ? (ap->gp_offset += 8,                         \
  43                     ap->reg_save_area + ap->gp_offset - 8)      \
  44                  : (ap->overflow_arg_area += 8,                 \
  45                     ap->overflow_arg_area - 8))                 \
  46         ))
  47 #define va_copy(dest, src)                                      \
  48     ((dest) = (va_list)malloc(sizeof(struct __va_list_struct)), \
  49      *(dest) = *(src))
  50 #define va_end(ap) __builtin_free(ap)
  51
  52 #else /* _WIN64 */
  53 typedef char *va_list;
  54 #define va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+7)&~7)
  55 #define va_arg(ap,type) (ap += (sizeof(type)+7)&~7, *(type *)(ap - ((sizeof(type)+7)&~7)))
  56 #define va_copy(dest, src) (dest) = (src)
  57 #define va_end(ap)
  58 #endif
  59
  60 #else /* __i386__ */
  61 typedef char *va_list;
  62 /* only correct for i386 */
  63 #define va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+3)&~3)
  64 #define va_arg(ap,type) (ap += (sizeof(type)+3)&~3, *(type *)(ap - ((sizeof(type)+3)&~3)))
  65 #define va_copy(dest, src) (dest) = (src)
  66 #define va_end(ap)
  67 #endif
  68
  69 /* fix a buggy dependency on GCC in libio.h */
  70 typedef va_list __gnuc_va_list;
  71 #define _VA_LIST_DEFINED
  72
  73 #endif /* _STDARG_H */