[270] | 1 | /*
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| 2 | ** mruby/boxing_nan.h - nan boxing mrb_value definition
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| 3 | **
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| 4 | ** See Copyright Notice in mruby.h
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| 5 | */
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| 6 |
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| 7 | #ifndef MRUBY_BOXING_NAN_H
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| 8 | #define MRUBY_BOXING_NAN_H
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| 9 |
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| 10 | #ifdef MRB_USE_FLOAT
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| 11 | # error ---->> MRB_NAN_BOXING and MRB_USE_FLOAT conflict <<----
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| 12 | #endif
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| 13 |
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| 14 | #ifdef MRB_INT64
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| 15 | # error ---->> MRB_NAN_BOXING and MRB_INT64 conflict <<----
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| 16 | #endif
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| 17 |
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| 18 | #define MRB_FIXNUM_SHIFT 0
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| 19 | #define MRB_TT_HAS_BASIC MRB_TT_OBJECT
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| 20 |
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| 21 | #ifdef MRB_ENDIAN_BIG
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| 22 | #define MRB_ENDIAN_LOHI(a,b) a b
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| 23 | #else
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| 24 | #define MRB_ENDIAN_LOHI(a,b) b a
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| 25 | #endif
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| 26 |
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| 27 | /* value representation by nan-boxing:
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| 28 | * float : FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF
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| 29 | * object: 111111111111TTTT TTPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP
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| 30 | * int : 1111111111110001 0000000000000000 IIIIIIIIIIIIIIII IIIIIIIIIIIIIIII
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| 31 | * sym : 1111111111110001 0100000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
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| 32 | * In order to get enough bit size to save TT, all pointers are shifted 2 bits
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| 33 | * in the right direction. Also, TTTTTT is the mrb_vtype + 1;
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| 34 | */
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| 35 | typedef struct mrb_value {
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| 36 | union {
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| 37 | mrb_float f;
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| 38 | union {
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| 39 | void *p;
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| 40 | struct {
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| 41 | MRB_ENDIAN_LOHI(
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| 42 | uint32_t ttt;
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| 43 | ,union {
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| 44 | mrb_int i;
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| 45 | mrb_sym sym;
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| 46 | };
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| 47 | )
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| 48 | };
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| 49 | } value;
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| 50 | };
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| 51 | } mrb_value;
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| 52 |
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| 53 | #define mrb_float_pool(mrb,f) mrb_float_value(mrb,f)
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| 54 |
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| 55 | #define mrb_tt(o) ((enum mrb_vtype)(((o).value.ttt & 0xfc000)>>14)-1)
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| 56 | #define mrb_type(o) ((uint32_t)0xfff00000 < (o).value.ttt ? mrb_tt(o) : MRB_TT_FLOAT)
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| 57 | #define mrb_ptr(o) ((void*)((((uintptr_t)0x3fffffffffff)&((uintptr_t)((o).value.p)))<<2))
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| 58 | #define mrb_float(o) (o).f
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| 59 | #define mrb_cptr(o) mrb_ptr(o)
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| 60 | #define mrb_fixnum(o) (o).value.i
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| 61 | #define mrb_symbol(o) (o).value.sym
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| 62 |
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| 63 | #define BOXNAN_SET_VALUE(o, tt, attr, v) do {\
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| 64 | switch (tt) {\
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| 65 | case MRB_TT_FALSE:\
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| 66 | case MRB_TT_TRUE:\
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| 67 | case MRB_TT_UNDEF:\
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| 68 | case MRB_TT_FIXNUM:\
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| 69 | case MRB_TT_SYMBOL: (o).attr = (v); break;\
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| 70 | default: (o).value.i = 0; (o).value.p = (void*)((uintptr_t)(o).value.p | (((uintptr_t)(v))>>2)); break;\
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| 71 | }\
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| 72 | (o).value.ttt = (0xfff00000|(((tt)+1)<<14));\
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| 73 | } while (0)
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| 74 |
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| 75 | #define SET_FLOAT_VALUE(mrb,r,v) do { \
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| 76 | if (v != v) { \
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| 77 | (r).value.ttt = 0x7ff80000; \
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| 78 | (r).value.i = 0; \
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| 79 | } else { \
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| 80 | (r).f = v; \
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| 81 | }} while(0)
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| 82 |
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| 83 | #define SET_NIL_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 0)
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| 84 | #define SET_FALSE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 1)
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| 85 | #define SET_TRUE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_TRUE, value.i, 1)
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| 86 | #define SET_BOOL_VALUE(r,b) BOXNAN_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, value.i, 1)
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| 87 | #define SET_INT_VALUE(r,n) BOXNAN_SET_VALUE(r, MRB_TT_FIXNUM, value.i, (n))
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| 88 | #define SET_SYM_VALUE(r,v) BOXNAN_SET_VALUE(r, MRB_TT_SYMBOL, value.sym, (v))
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| 89 | #define SET_OBJ_VALUE(r,v) BOXNAN_SET_VALUE(r, (((struct RObject*)(v))->tt), value.p, (v))
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| 90 | #define SET_CPTR_VALUE(mrb,r,v) BOXNAN_SET_VALUE(r, MRB_TT_CPTR, value.p, v)
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| 91 | #define SET_UNDEF_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_UNDEF, value.i, 0)
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| 92 |
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| 93 | #endif /* MRUBY_BOXING_NAN_H */
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