2 ** 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_TT_HAS_BASIC MRB_TT_OBJECT
26 #define MRB_ENDIAN_LOHI(a,b) a b
28 #define MRB_ENDIAN_LOHI(a,b) b a
31 /* value representation by nan-boxing:
32 * float : FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF
33 * object: 111111111111TTTT TTPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP
34 * int : 1111111111110001 0000000000000000 IIIIIIIIIIIIIIII IIIIIIIIIIIIIIII
35 * sym : 1111111111110001 0100000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
36 * In order to get enough bit size to save TT, all pointers are shifted 2 bits
37 * in the right direction. Also, TTTTTT is the mrb_vtype + 1;
39 typedef struct mrb_value {
57 #define mrb_float_pool(mrb,f) mrb_float_value(mrb,f)
59 #define mrb_tt(o) ((enum mrb_vtype)(((o).value.ttt & 0xfc000)>>14)-1)
60 #define mrb_type(o) (enum mrb_vtype)((uint32_t)0xfff00000 < (o).value.ttt ? mrb_tt(o) : MRB_TT_FLOAT)
61 #define mrb_ptr(o) ((void*)((((uintptr_t)0x3fffffffffff)&((uintptr_t)((o).value.p)))<<2))
62 #define mrb_float(o) (o).f
63 #define mrb_cptr(o) mrb_ptr(o)
64 #define mrb_fixnum(o) (o).value.i
65 #define mrb_symbol(o) (o).value.sym
68 #define BOXNAN_SHIFT_LONG_POINTER(v) (((uintptr_t)(v)>>34)&0x3fff)
70 #define BOXNAN_SHIFT_LONG_POINTER(v) 0
73 #define BOXNAN_SET_VALUE(o, tt, attr, v) do {\
75 (o).value.ttt = 0xfff00000 | (((tt)+1)<<14);\
78 #define BOXNAN_SET_OBJ_VALUE(o, tt, v) do {\
79 (o).value.p = (void*)((uintptr_t)(v)>>2);\
80 (o).value.ttt = (0xfff00000|(((tt)+1)<<14)|BOXNAN_SHIFT_LONG_POINTER(v));\
83 #define SET_FLOAT_VALUE(mrb,r,v) do { \
85 (r).value.ttt = 0x7ff80000; \
92 #define SET_NIL_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 0)
93 #define SET_FALSE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 1)
94 #define SET_TRUE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_TRUE, value.i, 1)
95 #define SET_BOOL_VALUE(r,b) BOXNAN_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, value.i, 1)
96 #define SET_INT_VALUE(r,n) BOXNAN_SET_VALUE(r, MRB_TT_FIXNUM, value.i, (n))
97 #define SET_SYM_VALUE(r,v) BOXNAN_SET_VALUE(r, MRB_TT_SYMBOL, value.sym, (v))
98 #define SET_OBJ_VALUE(r,v) BOXNAN_SET_OBJ_VALUE(r, (((struct RObject*)(v))->tt), (v))
99 #define SET_CPTR_VALUE(mrb,r,v) BOXNAN_SET_OBJ_VALUE(r, MRB_TT_CPTR, v)
100 #define SET_UNDEF_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_UNDEF, value.i, 0)
102 #endif /* MRUBY_BOXING_NAN_H */