mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
0069e6738a
Preparation for: * 64 bit integer with NaN Boxing * Favor pointer NaN Boxing
136 lines
3.7 KiB
C
136 lines
3.7 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_FLOAT32
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# error ---->> MRB_NAN_BOXING and MRB_USE_FLOAT32 conflict <<----
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#endif
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#ifdef MRB_NO_FLOAT
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# error ---->> MRB_NAN_BOXING and MRB_NO_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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#define MRB_FIXNUM_MIN INT32_MIN
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#define MRB_FIXNUM_MAX INT32_MAX
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enum mrb_nanbox_tt_inline {
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MRB_NANBOX_TT_OBJECT = 1,
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MRB_NANBOX_TT_INTEGER,
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MRB_NANBOX_TT_SYMBOL,
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MRB_NANBOX_TT_POINTER,
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MRB_NANBOX_TT_MISC,
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};
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/* value representation by nan-boxing:
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* float : FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF FFFFFFFFFFFFFFFF
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* object: 1111111111110001 PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP PPPPPPPPPPPPPPPP
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* int : 1111111111110010 0000000000000000 IIIIIIIIIIIIIIII IIIIIIIIIIIIIIII
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* sym : 1111111111110011 0000000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
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* ptr : 1111111111110100 0000000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
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* misc : 1111111111110101 0000000000000000 0000000000000000 TTTTTT000000MMMM
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*/
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typedef struct mrb_value {
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uint64_t u;
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} mrb_value;
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union mrb_value_ {
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mrb_float f;
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uint64_t u;
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#ifdef MRB_64BIT
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void *p;
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# define NANBOX_IMMEDIATE_VALUE uint32_t i
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#else
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# define NANBOX_IMMEDIATE_VALUE union { uint32_t i; void *p; }
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#endif
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struct {
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MRB_ENDIAN_LOHI(
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uint32_t ttt;
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,NANBOX_IMMEDIATE_VALUE;
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)
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};
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mrb_value value;
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};
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mrb_static_assert(sizeof(mrb_value) == sizeof(union mrb_value_));
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static inline mrb_float
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mrb_float(mrb_value v)
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{
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union {
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mrb_float f;
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uint64_t u;
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} x;
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x.u = v.u;
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return x.f;
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}
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#define SET_FLOAT_VALUE(mrb,r,v) do { \
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union { \
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mrb_float f; \
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uint64_t u; \
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} float_uint_union; \
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if ((v) != (v)) { /* NaN */ \
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float_uint_union.u = 0x7ff8000000000000UL; \
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} \
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else { \
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float_uint_union.f = (v); \
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} \
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r.u = float_uint_union.u; \
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} while(0)
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#define NANBOX_SET_VALUE(o, tt, v) do { \
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(o).u = ((0xfff0|(tt))<<48) | (v).u; \
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} while (0)
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MRB_INLINE enum mrb_vtype
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mrb_type(mrb_value o)
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{
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if ((o.u >> 52) == 0xfff) return MRB_TT_FLOAT;
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switch ((o.u >> 48) & 7) {
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case MRB_NANBOX_TT_OBJECT: {
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uintptr_t u = o.u & ~((~0)<<48);
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return ((struct RBasic *)u)->tt;
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}
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case MRB_NANBOX_TT_INTEGER:
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return MRB_TT_INTEGER;
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case MRB_NANBOX_TT_SYMBOL:
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return MRB_TT_SYMBOL;
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case MRB_NANBOX_TT_POINTER:
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return MRB_TT_CPTR;
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case MRB_NANBOX_TT_MISC:
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return (enum mrb_vtype)(o.u >> 5) & 0x1f;
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default:
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return MRB_TT_FLOAT;
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}
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}
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#define mrb_fixnum(o) ((mrb_int)((uintptr_t)0xffffffff)&((o).u))
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#define mrb_integer(o) mrb_fixnum(o)
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#define mrb_symbol(o) ((mrb_sym)((uintptr_t)0xffffffff)&((o).u))
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#define mrb_ptr(o) ((void*)(((uintptr_t)0xfffffffffff)&((o).u)))
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#define mrb_cptr(o) mrb_ptr(o)
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#define SET_NIL_VALUE(r) NANBOX_SET_MISC_VALUE(r, MRB_TT_FALSE, 0)
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#define SET_FALSE_VALUE(r) NANBOX_SET_MISC_VALUE(r, MRB_TT_FALSE, 1)
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#define SET_TRUE_VALUE(r) NANBOX_SET_MISC_VALUE(r, MRB_TT_TRUE, 1)
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#define SET_BOOL_VALUE(r,b) NANBOX_SET_MISC_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, 1)
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#define SET_INT_VALUE(mrb,r,n) SET_FIXNUM_VALUE(r,n)
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#define SET_FIXNUM_VALUE(r,n) NANBOX_SET_VALUE(r, MRB_NANBOX_TT_INTEGER, (uint32_t)(n))
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#define SET_SYM_VALUE(r,v) NANBOX_SET_VALUE(r, MRB_NANBOX_TT_SYMBOL, (uint32_t)(v))
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#define SET_OBJ_VALUE(r,v) NANBOX_SET_VALUE(o, MRB_NANBOT_TT_OBJECT, v)
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#define SET_CPTR_VALUE(mrb,r,v) NANBOX_SET_VALUE(o, MRB_NANBOT_TT_POINTER, v)
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#define SET_UNDEF_VALUE(r) NANBOX_SET_MISC_VALUE(r, MRB_TT_UNDEF, 4)
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#endif /* MRUBY_BOXING_NAN_H */
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