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/*
** mruby/boxing_word.h - word boxing mrb_value definition
**
** See Copyright Notice in mruby.h
*/
#ifndef MRUBY_BOXING_WORD_H
#define MRUBY_BOXING_WORD_H
#if defined(MRB_INT16)
# error MRB_INT16 is too small for MRB_WORD_BOXING.
#endif
#if defined(MRB_INT64) && !defined(MRB_64BIT)
#error MRB_INT64 cannot be used with MRB_WORD_BOXING in 32-bit mode.
#endif
struct RFloat {
MRB_OBJECT_HEADER;
mrb_float f;
};
struct RCptr {
MRB_OBJECT_HEADER;
void *p;
};
#define MRB_FIXNUM_SHIFT 1
#define MRB_TT_HAS_BASIC MRB_TT_FLOAT
enum mrb_special_consts {
MRB_Qnil = 0,
MRB_Qfalse = 2,
MRB_Qtrue = 4,
MRB_Qundef = 6,
};
#define MRB_FIXNUM_FLAG 0x01
#define MRB_SYMBOL_FLAG 0x0e
#define MRB_SPECIAL_SHIFT 8
typedef union mrb_value {
union {
void *p;
struct {
unsigned int i_flag : MRB_FIXNUM_SHIFT;
mrb_int i : (MRB_INT_BIT - MRB_FIXNUM_SHIFT);
};
struct {
unsigned int sym_flag : MRB_SPECIAL_SHIFT;
mrb_sym sym : (sizeof(mrb_sym) * CHAR_BIT);
};
struct RBasic *bp;
struct RFloat *fp;
struct RCptr *vp;
} value;
unsigned long w;
} mrb_value;
MRB_API mrb_value mrb_word_boxing_cptr_value(struct mrb_state*, void*);
MRB_API mrb_value mrb_word_boxing_float_value(struct mrb_state*, mrb_float);
MRB_API mrb_value mrb_word_boxing_float_pool(struct mrb_state*, mrb_float);
#define mrb_float_pool(mrb,f) mrb_word_boxing_float_pool(mrb,f)
#define mrb_ptr(o) (o).value.p
#define mrb_cptr(o) (o).value.vp->p
#define mrb_float(o) (o).value.fp->f
#define mrb_fixnum(o) ((mrb_int)(o).value.i)
#define mrb_symbol(o) (o).value.sym
static inline enum mrb_vtype
mrb_type(mrb_value o)
{
switch (o.w) {
case MRB_Qfalse:
case MRB_Qnil:
return MRB_TT_FALSE;
case MRB_Qtrue:
return MRB_TT_TRUE;
case MRB_Qundef:
return MRB_TT_UNDEF;
}
if (o.value.i_flag == MRB_FIXNUM_FLAG) {
return MRB_TT_FIXNUM;
}
if (o.value.sym_flag == MRB_SYMBOL_FLAG) {
return MRB_TT_SYMBOL;
}
return o.value.bp->tt;
}
#define mrb_bool(o) ((o).w != MRB_Qnil && (o).w != MRB_Qfalse)
#define mrb_fixnum_p(o) ((o).value.i_flag == MRB_FIXNUM_FLAG)
#define mrb_undef_p(o) ((o).w == MRB_Qundef)
#define mrb_nil_p(o) ((o).w == MRB_Qnil)
#define BOXWORD_SET_VALUE(o, ttt, attr, v) do { \
switch (ttt) {\
case MRB_TT_FALSE: (o).w = (v) ? MRB_Qfalse : MRB_Qnil; break;\
case MRB_TT_TRUE: (o).w = MRB_Qtrue; break;\
case MRB_TT_UNDEF: (o).w = MRB_Qundef; break;\
case MRB_TT_FIXNUM: (o).w = 0;(o).value.i_flag = MRB_FIXNUM_FLAG; (o).attr = (v); break;\
case MRB_TT_SYMBOL: (o).w = 0;(o).value.sym_flag = MRB_SYMBOL_FLAG; (o).attr = (v); break;\
default: (o).w = 0; (o).attr = (v); if ((o).value.bp) (o).value.bp->tt = ttt; break;\
}\
} while (0)
#define SET_FLOAT_VALUE(mrb,r,v) r = mrb_word_boxing_float_value(mrb, v)
#define SET_CPTR_VALUE(mrb,r,v) r = mrb_word_boxing_cptr_value(mrb, v)
#define SET_NIL_VALUE(r) BOXWORD_SET_VALUE(r, MRB_TT_FALSE, value.i, 0)
#define SET_FALSE_VALUE(r) BOXWORD_SET_VALUE(r, MRB_TT_FALSE, value.i, 1)
#define SET_TRUE_VALUE(r) BOXWORD_SET_VALUE(r, MRB_TT_TRUE, value.i, 1)
#define SET_BOOL_VALUE(r,b) BOXWORD_SET_VALUE(r, b ? MRB_TT_TRUE : MRB_TT_FALSE, value.i, 1)
#define SET_INT_VALUE(r,n) BOXWORD_SET_VALUE(r, MRB_TT_FIXNUM, value.i, (n))
#define SET_SYM_VALUE(r,v) BOXWORD_SET_VALUE(r, MRB_TT_SYMBOL, value.sym, (v))
#define SET_OBJ_VALUE(r,v) BOXWORD_SET_VALUE(r, (((struct RObject*)(v))->tt), value.p, (v))
#define SET_UNDEF_VALUE(r) BOXWORD_SET_VALUE(r, MRB_TT_UNDEF, value.i, 0)
#endif /* MRUBY_BOXING_WORD_H */
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