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https://github.com/mruby/mruby
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dearblue
b774832ee1
`mrb_static_assert()` extends the macro function to take one or two arguments. If the argument is other than that, an error will occur. References: - static_assert のメッセージ省略を許可 - cpprefjp C++日本語リファレンス https://cpprefjp.github.io/lang/cpp17/extending_static_assert.html - c - Overloading Macro on Number of Arguments - Stack Overflow https://stackoverflow.com/a/11763277
170 lines
4.8 KiB
C
170 lines
4.8 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_POINTER = 1,
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MRB_NANBOX_TT_INTEGER,
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MRB_NANBOX_TT_SYMBOL,
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MRB_NANBOX_TT_MISC,
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#ifndef MRB_NO_FLOAT
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MRB_NANBOX_TT_FLOAT,
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#endif
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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 0100000000000000 SSSSSSSSSSSSSSSS SSSSSSSSSSSSSSSS
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* misc : 1111111111110100 0100000000000000 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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#endif
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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 union mrb_value_
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mrb_val_union(mrb_value v)
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{
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union mrb_value_ x;
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x.u = v.u;
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return x;
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}
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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 mrb_tt_(o) ((enum mrb_nanbox_tt_inline)((o).u >> 48)&0xf)
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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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switch (mrb_tt_(o)) {
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case MRB_NANBOX_TT_POINTER:
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return RBASIC(o)->tt;
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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_MISC:
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return (enum mrb_vtype)(o.u >> 10) & 0x3f;
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#ifndef MRB_NO_FLOAT
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default:
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return MRB_TT_FLOAT;
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#endif
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}
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return MRB_TT_UNDEF;
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}
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#define mrb_symbol(o) ((mrb_sym)((o).u & 0x3fffffff))
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#ifdef MRB_INT64
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#define mrb_fixnum(o) ((mrb_int)((o).u & 0xffffffffffffL))
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#define mrb_integer(o) ((mrb_tt(o)==MRB_NANBOX_TT_POINTER)?(((struct RInteger*)mrb_ptr(o))->i):mrb_fixnum(o)))
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#else /* MRB_INT32 */
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#define mrb_fixnum(o) ((mrb_int)((o).u & 0xffffffff))
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#define mrb_integer(o) mrb_fixnum(o)
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#endif
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#ifdef MRB_64BIT
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#define mrb_ptr(o) ((void*)(((uintptr_t)(o).u) & 0xffffffffffff))
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#else
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#define mrb_ptr(o) ((void*)(((uintptr_t)(o).u) & 0xffffffff))
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#endif
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#define mrb_cptr(o) mrb_ptr(o)
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#define NANBOX_SET_VALUE(o, tt, attr, v) do { \
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union mrb_value_ mrb_value_union_variable; \
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mrb_value_union_variable.attr = (v);\
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mrb_value_union_variable.ttt = 0xfff00000 | (((tt)+1)<<14);\
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o = mrb_value_union_variable.value;\
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} while (0)
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#ifdef MRB_64BIT
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#define NANBOX_SET_OBJ_VALUE(o, tt, v) do {\
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union mrb_value_ mrb_value_union_variable;\
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mrb_value_union_variable.p = (void*)((uintptr_t)(v)>>2);\
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mrb_value_union_variable.ttt = (0xfff00000|(((tt)+1)<<14)|NANBOX_SHIFT_LONG_POINTER(v));\
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o = mrb_value_union_variable.value;\
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} while (0)
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#else
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#define NANBOX_SET_OBJ_VALUE(o, tt, v) NANBOX_SET_VALUE(o, tt, i, (uint32_t)v)
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#endif
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#define SET_FLOAT_VALUE(mrb,r,v) do { \
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union mrb_value_ mrb_value_union_variable; \
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if ((v) != (v)) { /* NaN */ \
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mrb_value_union_variable.u = 0x7ff8000000000000UL; \
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} \
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else { \
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mrb_value_union_variable.f = (v); \
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} \
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r = mrb_value_union_variable.value; \
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} while(0)
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#define NANBOX_SET_MISC_VALUE(o, tt, attr, v) do { \
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union mrb_value_ mrb_value_union_variable; \
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mrb_value_union_variable.attr = (v);\
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mrb_value_union_variable.ttt = 0xfff00000 | (((tt)+1)<<14);\
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o = mrb_value_union_variable.value;\
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} while (0)
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#define SET_NIL_VALUE(r) NANBOX_SET_VALUE(r, MRB_TT_FALSE, i, 0)
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#define SET_FALSE_VALUE(r) NANBOX_SET_VALUE(r, MRB_TT_FALSE, i, 1)
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#define SET_TRUE_VALUE(r) NANBOX_SET_VALUE(r, MRB_TT_TRUE, i, 1)
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#define SET_BOOL_VALUE(r,b) NANBOX_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, i, 1)
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#define SET_INT_VALUE(mrb, r,n) NANBOX_SET_VALUE(r, MRB_TT_INTEGER, i, (uint32_t)(n))
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#define SET_FIXNUM_VALUE(r,n) NANBOX_SET_VALUE(r, MRB_TT_INTEGER, i, (uint32_t)(n))
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#define SET_SYM_VALUE(r,v) NANBOX_SET_VALUE(r, MRB_TT_SYMBOL, i, (uint32_t)(v))
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#define SET_OBJ_VALUE(r,v) NANBOX_SET_OBJ_VALUE(r, (((struct RObject*)(v))->tt), (v))
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#ifdef MRB_64BIT
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MRB_API mrb_value mrb_nan_boxing_cptr_value(struct mrb_state*, void*);
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#define SET_CPTR_VALUE(mrb,r,v) ((r) = mrb_nan_boxing_cptr_value(mrb, v))
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#else
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#define SET_CPTR_VALUE(mrb,r,v) NANBOX_SET_VALUE(r, MRB_TT_CPTR, p, v)
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#endif
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#define SET_UNDEF_VALUE(r) NANBOX_SET_VALUE(r, MRB_TT_UNDEF, i, 0)
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#endif /* MRUBY_BOXING_NAN_H */
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