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) (enum mrb_vtype)((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 | #ifdef MRB_64BIT
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64 | #define BOXNAN_SHIFT_LONG_POINTER(v) (((uintptr_t)(v)>>34)&0x3fff)
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65 | #else
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66 | #define BOXNAN_SHIFT_LONG_POINTER(v) 0
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67 | #endif
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68 |
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69 | #define BOXNAN_SET_VALUE(o, tt, attr, v) do {\
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70 | (o).attr = (v);\
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71 | (o).value.ttt = 0xfff00000 | (((tt)+1)<<14);\
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72 | } while (0)
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73 |
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74 | #define BOXNAN_SET_OBJ_VALUE(o, tt, v) do {\
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75 | (o).value.p = (void*)((uintptr_t)(v)>>2);\
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76 | (o).value.ttt = (0xfff00000|(((tt)+1)<<14)|BOXNAN_SHIFT_LONG_POINTER(v));\
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77 | } while (0)
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78 |
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79 | #define SET_FLOAT_VALUE(mrb,r,v) do { \
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80 | if (v != v) { \
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81 | (r).value.ttt = 0x7ff80000; \
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82 | (r).value.i = 0; \
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83 | } \
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84 | else { \
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85 | (r).f = v; \
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86 | }} while(0)
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87 |
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88 | #define SET_NIL_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 0)
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89 | #define SET_FALSE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 1)
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90 | #define SET_TRUE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_TRUE, value.i, 1)
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91 | #define SET_BOOL_VALUE(r,b) BOXNAN_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, value.i, 1)
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92 | #define SET_INT_VALUE(r,n) BOXNAN_SET_VALUE(r, MRB_TT_FIXNUM, value.i, (n))
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93 | #define SET_SYM_VALUE(r,v) BOXNAN_SET_VALUE(r, MRB_TT_SYMBOL, value.sym, (v))
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94 | #define SET_OBJ_VALUE(r,v) BOXNAN_SET_OBJ_VALUE(r, (((struct RObject*)(v))->tt), (v))
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95 | #define SET_CPTR_VALUE(mrb,r,v) BOXNAN_SET_OBJ_VALUE(r, MRB_TT_CPTR, v)
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96 | #define SET_UNDEF_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_UNDEF, value.i, 0)
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97 |
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98 | #endif /* MRUBY_BOXING_NAN_H */
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