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ruby--ruby/internal/bignum.h
卜部昌平 4ff3f20540 add #include guard hack 
According to MSVC manual (*1), cl.exe can skip including a header file
when that:

- contains #pragma once, or
- starts with #ifndef, or
- starts with #if ! defined.

GCC has a similar trick (*2), but it acts more stricter (e. g. there
must be _no tokens_ outside of #ifndef...#endif).

Sun C lacked #pragma once for a looong time.  Oracle Developer Studio
12.5 finally implemented it, but we cannot assume such recent version.

This changeset modifies header files so that each of them include
strictly one #ifndef...#endif.  I believe this is the most portable way
to trigger compiler optimizations. [Bug #16770]

*1: https://docs.microsoft.com/en-us/cpp/preprocessor/once
*2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
2020-04-13 16:06:00 +09:00

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#ifndef INTERNAL_BIGNUM_H /*-*-C-*-vi:se ft=c:*/
#define INTERNAL_BIGNUM_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @brief Internal header for Bignums.
*/
#include "ruby/3/config.h" /* for HAVE_LIBGMP */
#include <stddef.h> /* for size_t */
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h> /* for ssize_t (note: on Windows ssize_t is */
#endif /* `#define`d in ruby/config.h) */
#include "ruby/3/stdbool.h" /* for bool */
#include "ruby/ruby.h" /* for struct RBasic */
#ifndef BDIGIT
# if SIZEOF_INT*2 <= SIZEOF_LONG_LONG
# define BDIGIT unsigned int
# define SIZEOF_BDIGIT SIZEOF_INT
# define BDIGIT_DBL unsigned LONG_LONG
# define BDIGIT_DBL_SIGNED LONG_LONG
# define PRI_BDIGIT_PREFIX ""
# define PRI_BDIGIT_DBL_PREFIX PRI_LL_PREFIX
# elif SIZEOF_INT*2 <= SIZEOF_LONG
# define BDIGIT unsigned int
# define SIZEOF_BDIGIT SIZEOF_INT
# define BDIGIT_DBL unsigned long
# define BDIGIT_DBL_SIGNED long
# define PRI_BDIGIT_PREFIX ""
# define PRI_BDIGIT_DBL_PREFIX "l"
# elif SIZEOF_SHORT*2 <= SIZEOF_LONG
# define BDIGIT unsigned short
# define SIZEOF_BDIGIT SIZEOF_SHORT
# define BDIGIT_DBL unsigned long
# define BDIGIT_DBL_SIGNED long
# define PRI_BDIGIT_PREFIX "h"
# define PRI_BDIGIT_DBL_PREFIX "l"
# else
# define BDIGIT unsigned short
# define SIZEOF_BDIGIT (SIZEOF_LONG/2)
# define SIZEOF_ACTUAL_BDIGIT SIZEOF_LONG
# define BDIGIT_DBL unsigned long
# define BDIGIT_DBL_SIGNED long
# define PRI_BDIGIT_PREFIX "h"
# define PRI_BDIGIT_DBL_PREFIX "l"
# endif
#endif
#ifndef SIZEOF_ACTUAL_BDIGIT
# define SIZEOF_ACTUAL_BDIGIT SIZEOF_BDIGIT
#endif
#ifdef PRI_BDIGIT_PREFIX
# define PRIdBDIGIT PRI_BDIGIT_PREFIX"d"
# define PRIiBDIGIT PRI_BDIGIT_PREFIX"i"
# define PRIoBDIGIT PRI_BDIGIT_PREFIX"o"
# define PRIuBDIGIT PRI_BDIGIT_PREFIX"u"
# define PRIxBDIGIT PRI_BDIGIT_PREFIX"x"
# define PRIXBDIGIT PRI_BDIGIT_PREFIX"X"
#endif
#ifdef PRI_BDIGIT_DBL_PREFIX
# define PRIdBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"d"
# define PRIiBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"i"
# define PRIoBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"o"
# define PRIuBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"u"
# define PRIxBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"x"
# define PRIXBDIGIT_DBL PRI_BDIGIT_DBL_PREFIX"X"
#endif
#define RBIGNUM(obj) (R_CAST(RBignum)(obj))
#define BIGNUM_SIGN_BIT FL_USER1
#define BIGNUM_EMBED_FLAG ((VALUE)FL_USER2)
#define BIGNUM_EMBED_LEN_NUMBITS 3
#define BIGNUM_EMBED_LEN_MASK \
(~(~(VALUE)0U << BIGNUM_EMBED_LEN_NUMBITS) << BIGNUM_EMBED_LEN_SHIFT)
#define BIGNUM_EMBED_LEN_SHIFT \
(FL_USHIFT+3) /* bit offset of BIGNUM_EMBED_LEN_MASK */
#ifndef BIGNUM_EMBED_LEN_MAX
# if (SIZEOF_VALUE*RVALUE_EMBED_LEN_MAX/SIZEOF_ACTUAL_BDIGIT) < (1 << BIGNUM_EMBED_LEN_NUMBITS)-1
# define BIGNUM_EMBED_LEN_MAX (SIZEOF_VALUE*RVALUE_EMBED_LEN_MAX/SIZEOF_ACTUAL_BDIGIT)
# else
# define BIGNUM_EMBED_LEN_MAX ((1 << BIGNUM_EMBED_LEN_NUMBITS)-1)
# endif
#endif
enum rb_int_parse_flags {
RB_INT_PARSE_SIGN = 0x01,
RB_INT_PARSE_UNDERSCORE = 0x02,
RB_INT_PARSE_PREFIX = 0x04,
RB_INT_PARSE_ALL = 0x07,
RB_INT_PARSE_DEFAULT = 0x07,
};
struct RBignum {
struct RBasic basic;
union {
struct {
size_t len;
BDIGIT *digits;
} heap;
BDIGIT ary[BIGNUM_EMBED_LEN_MAX];
} as;
};
/* bignum.c */
extern const char ruby_digitmap[];
double rb_big_fdiv_double(VALUE x, VALUE y);
VALUE rb_big_uminus(VALUE x);
VALUE rb_big_hash(VALUE);
VALUE rb_big_odd_p(VALUE);
VALUE rb_big_even_p(VALUE);
size_t rb_big_size(VALUE);
VALUE rb_integer_float_cmp(VALUE x, VALUE y);
VALUE rb_integer_float_eq(VALUE x, VALUE y);
VALUE rb_str_convert_to_inum(VALUE str, int base, int badcheck, int raise_exception);
VALUE rb_big_comp(VALUE x);
VALUE rb_big_aref(VALUE x, VALUE y);
VALUE rb_big_abs(VALUE x);
VALUE rb_big_size_m(VALUE big);
VALUE rb_big_bit_length(VALUE big);
VALUE rb_big_remainder(VALUE x, VALUE y);
VALUE rb_big_gt(VALUE x, VALUE y);
VALUE rb_big_ge(VALUE x, VALUE y);
VALUE rb_big_lt(VALUE x, VALUE y);
VALUE rb_big_le(VALUE x, VALUE y);
VALUE rb_int_powm(int const argc, VALUE * const argv, VALUE const num);
static inline bool BIGNUM_SIGN(VALUE b);
static inline bool BIGNUM_POSITIVE_P(VALUE b);
static inline bool BIGNUM_NEGATIVE_P(VALUE b);
static inline void BIGNUM_SET_SIGN(VALUE b, bool sign);
static inline void BIGNUM_NEGATE(VALUE b);
static inline size_t BIGNUM_LEN(VALUE b);
static inline BDIGIT *BIGNUM_DIGITS(VALUE b);
static inline int BIGNUM_LENINT(VALUE b);
static inline bool BIGNUM_EMBED_P(VALUE b);
RUBY_SYMBOL_EXPORT_BEGIN
/* bignum.c (export) */
VALUE rb_big_mul_normal(VALUE x, VALUE y);
VALUE rb_big_mul_balance(VALUE x, VALUE y);
VALUE rb_big_mul_karatsuba(VALUE x, VALUE y);
VALUE rb_big_mul_toom3(VALUE x, VALUE y);
VALUE rb_big_sq_fast(VALUE x);
VALUE rb_big_divrem_normal(VALUE x, VALUE y);
VALUE rb_big2str_poweroftwo(VALUE x, int base);
VALUE rb_big2str_generic(VALUE x, int base);
VALUE rb_str2big_poweroftwo(VALUE arg, int base, int badcheck);
VALUE rb_str2big_normal(VALUE arg, int base, int badcheck);
VALUE rb_str2big_karatsuba(VALUE arg, int base, int badcheck);
#if defined(HAVE_LIBGMP) && defined(HAVE_GMP_H)
VALUE rb_big_mul_gmp(VALUE x, VALUE y);
VALUE rb_big_divrem_gmp(VALUE x, VALUE y);
VALUE rb_big2str_gmp(VALUE x, int base);
VALUE rb_str2big_gmp(VALUE arg, int base, int badcheck);
#endif
VALUE rb_int_parse_cstr(const char *str, ssize_t len, char **endp, size_t *ndigits, int base, int flags);
RUBY_SYMBOL_EXPORT_END
MJIT_SYMBOL_EXPORT_BEGIN
#if defined(HAVE_INT128_T)
VALUE rb_int128t2big(int128_t n);
#endif
MJIT_SYMBOL_EXPORT_END
/* sign: positive:1, negative:0 */
static inline bool
BIGNUM_SIGN(VALUE b)
{
return FL_TEST_RAW(b, BIGNUM_SIGN_BIT);
}
static inline bool
BIGNUM_POSITIVE_P(VALUE b)
{
return BIGNUM_SIGN(b);
}
static inline bool
BIGNUM_NEGATIVE_P(VALUE b)
{
return ! BIGNUM_POSITIVE_P(b);
}
static inline void
BIGNUM_SET_SIGN(VALUE b, bool sign)
{
if (sign) {
FL_SET_RAW(b, BIGNUM_SIGN_BIT);
}
else {
FL_UNSET_RAW(b, BIGNUM_SIGN_BIT);
}
}
static inline void
BIGNUM_NEGATE(VALUE b)
{
FL_REVERSE_RAW(b, BIGNUM_SIGN_BIT);
}
static inline size_t
BIGNUM_LEN(VALUE b)
{
if (! BIGNUM_EMBED_P(b)) {
return RBIGNUM(b)->as.heap.len;
}
else {
size_t ret = RBASIC(b)->flags;
ret &= BIGNUM_EMBED_LEN_MASK;
ret >>= BIGNUM_EMBED_LEN_SHIFT;
return ret;
}
}
static inline int
BIGNUM_LENINT(VALUE b)
{
return rb_long2int(BIGNUM_LEN(b));
}
/* LSB:BIGNUM_DIGITS(b)[0], MSB:BIGNUM_DIGITS(b)[BIGNUM_LEN(b)-1] */
static inline BDIGIT *
BIGNUM_DIGITS(VALUE b)
{
if (BIGNUM_EMBED_P(b)) {
return RBIGNUM(b)->as.ary;
}
else {
return RBIGNUM(b)->as.heap.digits;
}
}
static inline bool
BIGNUM_EMBED_P(VALUE b)
{
return FL_TEST_RAW(b, BIGNUM_EMBED_FLAG);
}
#endif /* INTERNAL_BIGNUM_H */
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