diff options
Diffstat (limited to 'internal.h')
-rw-r--r-- | internal.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/internal.h b/internal.h index c27ebb7da4..a3b4045cde 100644 --- a/internal.h +++ b/internal.h @@ -305,6 +305,51 @@ struct method_table_wrapper { size_t serial; }; +#define RBIGNUM_EMBED_LEN_NUMBITS 3 +#ifndef RBIGNUM_EMBED_LEN_MAX +# if (SIZEOF_VALUE*3/SIZEOF_ACTUAL_BDIGIT) < (1 << RBIGNUM_EMBED_LEN_NUMBITS)-1 +# define RBIGNUM_EMBED_LEN_MAX (SIZEOF_VALUE*3/SIZEOF_ACTUAL_BDIGIT) +# else +# define RBIGNUM_EMBED_LEN_MAX ((1 << RBIGNUM_EMBED_LEN_NUMBITS)-1) +# endif +#endif + +struct RBignum { + struct RBasic basic; + union { + struct { + long len; + BDIGIT *digits; + } heap; + BDIGIT ary[RBIGNUM_EMBED_LEN_MAX]; + } as; +}; +#define RBIGNUM_SIGN_BIT FL_USER1 +/* sign: positive:1, negative:0 */ +#define RBIGNUM_SIGN(b) ((RBASIC(b)->flags & RBIGNUM_SIGN_BIT) != 0) +#define RBIGNUM_SET_SIGN(b,sign) \ + ((sign) ? (RBASIC(b)->flags |= RBIGNUM_SIGN_BIT) \ + : (RBASIC(b)->flags &= ~RBIGNUM_SIGN_BIT)) +#define RBIGNUM_POSITIVE_P(b) RBIGNUM_SIGN(b) +#define RBIGNUM_NEGATIVE_P(b) (!RBIGNUM_SIGN(b)) + +#define RBIGNUM_EMBED_FLAG FL_USER2 +#define RBIGNUM_EMBED_LEN_MASK (FL_USER5|FL_USER4|FL_USER3) +#define RBIGNUM_EMBED_LEN_SHIFT (FL_USHIFT+RBIGNUM_EMBED_LEN_NUMBITS) +#define RBIGNUM_LEN(b) \ + ((RBASIC(b)->flags & RBIGNUM_EMBED_FLAG) ? \ + (long)((RBASIC(b)->flags >> RBIGNUM_EMBED_LEN_SHIFT) & \ + (RBIGNUM_EMBED_LEN_MASK >> RBIGNUM_EMBED_LEN_SHIFT)) : \ + RBIGNUM(b)->as.heap.len) +/* LSB:RBIGNUM_DIGITS(b)[0], MSB:RBIGNUM_DIGITS(b)[RBIGNUM_LEN(b)-1] */ +#define RBIGNUM_DIGITS(b) \ + ((RBASIC(b)->flags & RBIGNUM_EMBED_FLAG) ? \ + RBIGNUM(b)->as.ary : \ + RBIGNUM(b)->as.heap.digits) +#define RBIGNUM_LENINT(b) rb_long2int(RBIGNUM_LEN(b)) + +#define RBIGNUM(obj) (R_CAST(RBignum)(obj)) + /* class.c */ void rb_class_subclass_add(VALUE super, VALUE klass); void rb_class_remove_from_super_subclasses(VALUE); |