mirror of
https://github.com/mruby/mruby
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3a92a4e3d8
If it gives clang-11.0 `-Wembedded-directive`, a warning will be reported in `include/mruby/boxing_nan.h`.
```
include/mruby/boxing_nan.h:48:2: warning: embedding a directive within macro arguments has undefined behavior [-Wembedded-directive]
include/mruby/boxing_nan.h:52:2: warning: embedding a directive within macro arguments has undefined behavior [-Wembedded-directive]
```
The cause of this is #5117.
ref. e993b83c50
131 lines
4.2 KiB
C
131 lines
4.2 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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/* 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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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 BOXNAN_IMMEDIATE_VALUE uint32_t i
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#else
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# define BOXNAN_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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,BOXNAN_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_assert1(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.value = v;
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return x;
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}
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#define mrb_tt(o) ((enum mrb_vtype)((mrb_val_union(o).ttt & 0xfc000)>>14)-1)
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#define mrb_type(o) (enum mrb_vtype)((uint32_t)0xfff00000 < mrb_val_union(o).ttt ? mrb_tt(o) : MRB_TT_FLOAT)
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#define mrb_float(o) mrb_val_union(o).f
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#define mrb_fixnum(o) ((mrb_int)mrb_val_union(o).i)
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#define mrb_integer(o) mrb_fixnum(o)
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#define mrb_symbol(o) ((mrb_sym)mrb_val_union(o).i)
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#ifdef MRB_64BIT
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#define mrb_ptr(o) ((void*)((((uintptr_t)0x3fffffffffff)&((uintptr_t)(mrb_val_union(o).p)))<<2))
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#define mrb_cptr(o) (((struct RCptr*)mrb_ptr(o))->p)
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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 mrb_ptr(o) ((void*)mrb_val_union(o).i)
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#define mrb_cptr(o) mrb_ptr(o)
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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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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 BOXNAN_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)|BOXNAN_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 BOXNAN_SET_OBJ_VALUE(o, tt, v) BOXNAN_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.ttt = 0x7ff80000; \
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mrb_value_union_variable.i = 0; \
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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 SET_NIL_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, i, 0)
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#define SET_FALSE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_FALSE, i, 1)
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#define SET_TRUE_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_TRUE, i, 1)
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#define SET_BOOL_VALUE(r,b) BOXNAN_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, i, 1)
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#define SET_INT_VALUE(mrb, r,n) BOXNAN_SET_VALUE(r, MRB_TT_INTEGER, i, (uint32_t)(n))
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#define SET_FIXNUM_VALUE(r,n) BOXNAN_SET_VALUE(r, MRB_TT_INTEGER, i, (uint32_t)(n))
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#define SET_SYM_VALUE(r,v) BOXNAN_SET_VALUE(r, MRB_TT_SYMBOL, i, (uint32_t)(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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#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) BOXNAN_SET_VALUE(r, MRB_TT_CPTR, p, v)
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#endif
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#define SET_UNDEF_VALUE(r) BOXNAN_SET_VALUE(r, MRB_TT_UNDEF, i, 0)
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#endif /* MRUBY_BOXING_NAN_H */
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