#ifndef _STDARG_H
#define _STDARG_H

#ifdef __x86_64__
#ifndef _WIN64

// This should be in sync with the declaration on our lib/libtcc1.c
/* GCC compatible definition of va_list. */
typedef struct {
  unsigned int gp_offset;
  unsigned int fp_offset;
  union {
    unsigned int overflow_offset;
    char* overflow_arg_area;
  };
  char* reg_save_area;
} __va_list_struct;

typedef __va_list_struct va_list[1];

void __va_start(__va_list_struct* ap, void* fp);
void* __va_arg(__va_list_struct* ap, int arg_type, int size, int align);

#define va_start(ap, last) __va_start(ap, __builtin_frame_address(0))
#define va_arg(ap, type) (*(type*)(__va_arg(ap, __builtin_va_arg_types(type), sizeof(type), __alignof__(type))))
#define va_copy(dest, src) (*(dest) = *(src))
#define va_end(ap)

/* avoid conflicting definition for va_list on Macs. */
#define _VA_LIST_T

#else /* _WIN64 */
typedef char* va_list;
#define va_start(ap, last) __builtin_va_start(ap, last)
#define va_arg(ap, t) ((sizeof(t) > 8 || (sizeof(t) & (sizeof(t) - 1))) ? **(t**)((ap += 8) - 8) : *(t*)((ap += 8) - 8))
#define va_copy(dest, src) ((dest) = (src))
#define va_end(ap)
#endif

#elif __arm__
typedef char* va_list;
#define _tcc_alignof(type) \
  ((int)&((struct { \
     char c; \
     type x; \
   }*)0) \
       ->x)
#define _tcc_align(addr, type) (((unsigned)addr + _tcc_alignof(type) - 1) & ~(_tcc_alignof(type) - 1))
#define va_start(ap, last) ap = ((char*)&(last)) + ((sizeof(last) + 3) & ~3)
#define va_arg(ap, type) \
  (ap = (void*)((_tcc_align(ap, type) + sizeof(type) + 3) & ~3), *(type*)(ap - ((sizeof(type) + 3) & ~3)))
#define va_copy(dest, src) (dest) = (src)
#define va_end(ap)

#elif defined(__aarch64__)
typedef struct {
  void* __stack;
  void* __gr_top;
  void* __vr_top;
  int __gr_offs;
  int __vr_offs;
} va_list;
#define va_start(ap, last) __va_start(ap, last)
#define va_arg(ap, type) __va_arg(ap, type)
#define va_end(ap)
#define va_copy(dest, src) ((dest) = (src))

#else /* __i386__ */
typedef char* va_list;
/* only correct for i386 */
#define va_start(ap, last) ap = ((char*)&(last)) + ((sizeof(last) + 3) & ~3)
#define va_arg(ap, type) (ap += (sizeof(type) + 3) & ~3, *(type*)(ap - ((sizeof(type) + 3) & ~3)))
#define va_copy(dest, src) (dest) = (src)
#define va_end(ap)
#endif

/* fix a buggy dependency on GCC in libio.h */
typedef va_list __gnuc_va_list;
#define _VA_LIST_DEFINED

#endif /* _STDARG_H */