2 ** @file mruby/boxing_nan.h - nan boxing mrb_value definition
4 ** See Copyright Notice in mruby.h
7 #ifndef MRUBY_BOXING_NAN_H
8 #define MRUBY_BOXING_NAN_H
11 # error ---->> MRB_NAN_BOXING and MRB_USE_FLOAT conflict <<----
14 #ifdef MRB_WITHOUT_FLOAT
15 # error ---->> MRB_NAN_BOXING and MRB_WITHOUT_FLOAT conflict <<----
19 # error ---->> MRB_NAN_BOXING and MRB_INT64 conflict <<----
22 #define MRB_FIXNUM_SHIFT 0
23 #define MRB_SYMBOL_SHIFT 0
25 /* value representation by nan-boxing:
26 * float : FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF
27 * object: 111111111111TTTT TTPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP
28 * int : 1111111111110001 0000000000000000 IIIIIIIIIIIIIIII IIIIIIIIIIIIIIII
29 * sym : 1111111111110001 0100000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
30 * In order to get enough bit size to save TT, all pointers are shifted 2 bits
31 * in the right direction. Also, TTTTTT is the mrb_vtype + 1;
33 typedef struct mrb_value {
54 #define mrb_float_pool(mrb,f) mrb_float_value(mrb,f)
56 #define mrb_tt(o) ((enum mrb_vtype)(((o).value.ttt & 0xfc000)>>14)-1)
57 #define mrb_type(o) (enum mrb_vtype)((uint32_t)0xfff00000 < (o).value.ttt ? mrb_tt(o) : MRB_TT_FLOAT)
58 #define mrb_ptr(o) ((void*)((((uintptr_t)0x3fffffffffff)&((uintptr_t)((o).value.p)))<<2))
59 #define mrb_float(o) (o).f
60 #define mrb_fixnum(o) (o).value.i
61 #define mrb_symbol(o) (o).value.sym
64 MRB_API mrb_value mrb_nan_boxing_cptr_value(struct mrb_state*, void*);
65 #define mrb_cptr(o) (((struct RCptr*)mrb_ptr(o))->p)
66 #define BOXNAN_SHIFT_LONG_POINTER(v) (((uintptr_t)(v)>>34)&0x3fff)
68 #define mrb_cptr(o) ((o).value.p)
69 #define BOXNAN_SHIFT_LONG_POINTER(v) 0
72 #define BOXNAN_SET_VALUE(o, tt, attr, v) do {\
74 (o).value.ttt = 0xfff00000 | (((tt)+1)<<14);\
77 #define BOXNAN_SET_OBJ_VALUE(o, tt, v) do {\
78 (o).value.p = (void*)((uintptr_t)(v)>>2);\
79 (o).value.ttt = (0xfff00000|(((tt)+1)<<14)|BOXNAN_SHIFT_LONG_POINTER(v));\
82 #define SET_FLOAT_VALUE(mrb,r,v) do { \
84 (r).value.ttt = 0x7ff80000; \
91 #define SET_NIL_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 0)
92 #define SET_FALSE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 1)
93 #define SET_TRUE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_TRUE, value.i, 1)
94 #define SET_BOOL_VALUE(r,b) BOXNAN_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, value.i, 1)
95 #define SET_INT_VALUE(r,n) BOXNAN_SET_VALUE(r, MRB_TT_FIXNUM, value.i, (n))
96 #define SET_SYM_VALUE(r,v) BOXNAN_SET_VALUE(r, MRB_TT_SYMBOL, value.sym, (v))
97 #define SET_OBJ_VALUE(r,v) BOXNAN_SET_OBJ_VALUE(r, (((struct RObject*)(v))->tt), (v))
99 #define SET_CPTR_VALUE(mrb,r,v) ((r) = mrb_nan_boxing_cptr_value(mrb, v))
101 #define SET_CPTR_VALUE(mrb,r,v) BOXNAN_SET_VALUE(r, MRB_TT_CPTR, value.p, v)
103 #define SET_UNDEF_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_UNDEF, value.i, 0)
105 #endif /* MRUBY_BOXING_NAN_H */