mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
KOBAYASHI Shuji
a53f28275e
### Example
```ruby
# example.rb
max32 = 2**30 - 1 + 2**30
min32 = -max32-1
[max32, max32+1, min32, min32-1].each{|n| p [n, n.class]}
```
#### Before this patch:
```
$ bin/mruby example.rb
[2147483647, Float]
[2147483648, Float]
[-2147483648, Float]
[-2147483649, Float]
```
#### After this patch:
```
$ bin/mruby example.rb
[2147483647, Fixnum]
[2147483648, Float]
[-2147483648, Fixnum]
[-2147483649, Float]
```
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/**
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** @file mruby/boxing_nan.h - nan boxing mrb_value definition
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**
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** See Copyright Notice in mruby.h
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*/
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#ifndef MRUBY_BOXING_NAN_H
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#define MRUBY_BOXING_NAN_H
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#ifdef MRB_USE_FLOAT
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# error ---->> MRB_NAN_BOXING and MRB_USE_FLOAT conflict <<----
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#endif
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#ifdef MRB_WITHOUT_FLOAT
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# error ---->> MRB_NAN_BOXING and MRB_WITHOUT_FLOAT conflict <<----
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#endif
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#ifdef MRB_INT64
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# error ---->> MRB_NAN_BOXING and MRB_INT64 conflict <<----
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#endif
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#define MRB_FIXNUM_SHIFT 0
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#define MRB_SYMBOL_SHIFT 0
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/* value representation by nan-boxing:
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* float : FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF
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* object: 111111111111TTTT TTPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP
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* int : 1111111111110001 0000000000000000 IIIIIIIIIIIIIIII IIIIIIIIIIIIIIII
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* sym : 1111111111110001 0100000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
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* In order to get enough bit size to save TT, all pointers are shifted 2 bits
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* in the right direction. Also, TTTTTT is the mrb_vtype + 1;
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*/
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typedef struct mrb_value {
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union {
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mrb_float f;
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union {
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void *p;
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struct {
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MRB_ENDIAN_LOHI(
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uint32_t ttt;
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,union {
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mrb_int i;
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mrb_sym sym;
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};
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)
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};
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} value;
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};
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} mrb_value;
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#define mrb_float_pool(mrb,f) mrb_float_value(mrb,f)
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#define mrb_tt(o) ((enum mrb_vtype)(((o).value.ttt & 0xfc000)>>14)-1)
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#define mrb_type(o) (enum mrb_vtype)((uint32_t)0xfff00000 < (o).value.ttt ? mrb_tt(o) : MRB_TT_FLOAT)
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#define mrb_ptr(o) ((void*)((((uintptr_t)0x3fffffffffff)&((uintptr_t)((o).value.p)))<<2))
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#define mrb_float(o) (o).f
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#define mrb_cptr(o) mrb_ptr(o)
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#define mrb_fixnum(o) (o).value.i
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#define mrb_symbol(o) (o).value.sym
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#ifdef MRB_64BIT
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#define BOXNAN_SHIFT_LONG_POINTER(v) (((uintptr_t)(v)>>34)&0x3fff)
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#else
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#define BOXNAN_SHIFT_LONG_POINTER(v) 0
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#endif
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#define BOXNAN_SET_VALUE(o, tt, attr, v) do {\
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(o).attr = (v);\
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(o).value.ttt = 0xfff00000 | (((tt)+1)<<14);\
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} while (0)
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#define BOXNAN_SET_OBJ_VALUE(o, tt, v) do {\
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(o).value.p = (void*)((uintptr_t)(v)>>2);\
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(o).value.ttt = (0xfff00000|(((tt)+1)<<14)|BOXNAN_SHIFT_LONG_POINTER(v));\
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} while (0)
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#define SET_FLOAT_VALUE(mrb,r,v) do { \
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if ((v) != (v)) { \
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(r).value.ttt = 0x7ff80000; \
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(r).value.i = 0; \
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} \
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else { \
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(r).f = v; \
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}} while(0)
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#define SET_NIL_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 0)
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#define SET_FALSE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, value.i, 1)
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#define SET_TRUE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_TRUE, value.i, 1)
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#define SET_BOOL_VALUE(r,b) BOXNAN_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, value.i, 1)
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#define SET_INT_VALUE(r,n) BOXNAN_SET_VALUE(r, MRB_TT_FIXNUM, value.i, (n))
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#define SET_SYM_VALUE(r,v) BOXNAN_SET_VALUE(r, MRB_TT_SYMBOL, value.sym, (v))
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#define SET_OBJ_VALUE(r,v) BOXNAN_SET_OBJ_VALUE(r, (((struct RObject*)(v))->tt), (v))
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#define SET_CPTR_VALUE(mrb,r,v) BOXNAN_SET_OBJ_VALUE(r, MRB_TT_CPTR, v)
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#define SET_UNDEF_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_UNDEF, value.i, 0)
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#endif /* MRUBY_BOXING_NAN_H */
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