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80fe9838d2
* The `Fixnum` constant is now an alias for the `Integer` class. * Remove `struct mrb_state::fixnum_class` member. If necessary, use `struct mrb_state::integer_class` instead.
197 lines
5.6 KiB
C
197 lines
5.6 KiB
C
/**
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** @file mruby/numeric.h - Numeric, Integer, Float class
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**
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** See Copyright Notice in mruby.h
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*/
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#ifndef MRUBY_NUMERIC_H
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#define MRUBY_NUMERIC_H
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#include "common.h"
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/**
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* Numeric class and it's sub-classes.
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*
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* Integer and Float
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*/
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MRB_BEGIN_DECL
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#define TYPED_POSFIXABLE(f,t) ((f) <= (t)MRB_INT_MAX)
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#define TYPED_NEGFIXABLE(f,t) ((f) >= (t)MRB_INT_MIN)
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#define TYPED_FIXABLE(f,t) (TYPED_POSFIXABLE(f,t) && TYPED_NEGFIXABLE(f,t))
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#define POSFIXABLE(f) TYPED_POSFIXABLE(f,mrb_int)
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#define NEGFIXABLE(f) TYPED_NEGFIXABLE(f,mrb_int)
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#define FIXABLE(f) TYPED_FIXABLE(f,mrb_int)
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#ifndef MRB_NO_FLOAT
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#ifdef MRB_INT64
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#define FIXABLE_FLOAT(f) ((f)>=-9223372036854775808.0 && (f)<9223372036854775808.0)
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#else
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#define FIXABLE_FLOAT(f) TYPED_FIXABLE(f,mrb_float)
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#endif
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#endif
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#ifndef MRB_NO_FLOAT
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MRB_API mrb_value mrb_flo_to_fixnum(mrb_state *mrb, mrb_value val);
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#endif
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MRB_API mrb_value mrb_fixnum_to_str(mrb_state *mrb, mrb_value x, mrb_int base);
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/* ArgumentError if format string doesn't match /%(\.[0-9]+)?[aAeEfFgG]/ */
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#ifndef MRB_NO_FLOAT
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MRB_API mrb_value mrb_float_to_str(mrb_state *mrb, mrb_value x, const char *fmt);
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MRB_API int mrb_float_to_cstr(mrb_state *mrb, char *buf, size_t len, const char *fmt, mrb_float f);
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MRB_API mrb_float mrb_to_flo(mrb_state *mrb, mrb_value x);
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MRB_API mrb_value mrb_int_value(mrb_state *mrb, mrb_float f);
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#endif
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MRB_API mrb_value mrb_num_plus(mrb_state *mrb, mrb_value x, mrb_value y);
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MRB_API mrb_value mrb_num_minus(mrb_state *mrb, mrb_value x, mrb_value y);
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MRB_API mrb_value mrb_num_mul(mrb_state *mrb, mrb_value x, mrb_value y);
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#if (defined(__GNUC__) && __GNUC__ >= 5) || \
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(__has_builtin(__builtin_add_overflow) && \
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__has_builtin(__builtin_sub_overflow) && \
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__has_builtin(__builtin_mul_overflow))
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# define MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
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#endif
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/*
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// Clang 3.8 and 3.9 have problem compiling mruby in 32-bit mode, when MRB_INT64 is set
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// because of missing __mulodi4 and similar functions in its runtime. We need to use custom
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// implementation for them.
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*/
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#ifdef MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
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#if defined(__clang__) && (__clang_major__ == 3) && (__clang_minor__ >= 8) && \
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defined(MRB_32BIT) && defined(MRB_INT64)
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#undef MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
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#endif
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#endif
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#ifdef MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
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#ifndef MRB_WORD_BOXING
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# define WBCHK(x) 0
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#else
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# define WBCHK(x) !FIXABLE(x)
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#endif
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static inline mrb_bool
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mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
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{
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return __builtin_add_overflow(augend, addend, sum) || WBCHK(*sum);
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}
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static inline mrb_bool
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mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
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{
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return __builtin_sub_overflow(minuend, subtrahend, difference) || WBCHK(*difference);
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}
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static inline mrb_bool
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mrb_int_mul_overflow(mrb_int multiplier, mrb_int multiplicand, mrb_int *product)
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{
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return __builtin_mul_overflow(multiplier, multiplicand, product) || WBCHK(*product);
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}
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#undef WBCHK
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#else
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#define MRB_UINT_MAKE2(n) uint ## n ## _t
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#define MRB_UINT_MAKE(n) MRB_UINT_MAKE2(n)
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#define mrb_uint MRB_UINT_MAKE(MRB_INT_BIT)
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#define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1 - MRB_FIXNUM_SHIFT))
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static inline mrb_bool
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mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
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{
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mrb_uint x = (mrb_uint)augend;
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mrb_uint y = (mrb_uint)addend;
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mrb_uint z = (mrb_uint)(x + y);
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*sum = (mrb_int)z;
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return !!(((x ^ z) & (y ^ z)) & MRB_INT_OVERFLOW_MASK);
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}
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static inline mrb_bool
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mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
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{
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mrb_uint x = (mrb_uint)minuend;
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mrb_uint y = (mrb_uint)subtrahend;
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mrb_uint z = (mrb_uint)(x - y);
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*difference = (mrb_int)z;
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return !!(((x ^ z) & (~y ^ z)) & MRB_INT_OVERFLOW_MASK);
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}
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static inline mrb_bool
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mrb_int_mul_overflow(mrb_int multiplier, mrb_int multiplicand, mrb_int *product)
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{
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#if MRB_INT_BIT == 32
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int64_t n = (int64_t)multiplier * multiplicand;
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*product = (mrb_int)n;
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return !FIXABLE(n);
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#else
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if (multiplier > 0) {
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if (multiplicand > 0) {
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if (multiplier > MRB_INT_MAX / multiplicand) return TRUE;
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}
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else {
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if (multiplicand < MRB_INT_MAX / multiplier) return TRUE;
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}
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}
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else {
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if (multiplicand > 0) {
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if (multiplier < MRB_INT_MAX / multiplicand) return TRUE;
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}
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else {
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if (multiplier != 0 && multiplicand < MRB_INT_MAX / multiplier) return TRUE;
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}
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}
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*product = multiplier * multiplicand;
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return FALSE;
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#endif
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}
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#undef MRB_INT_OVERFLOW_MASK
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#undef mrb_uint
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#undef MRB_UINT_MAKE
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#undef MRB_UINT_MAKE2
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#endif
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#ifndef MRB_NO_FLOAT
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# include <stdint.h>
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# include <float.h>
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# define MRB_FLT_RADIX FLT_RADIX
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# ifdef MRB_USE_FLOAT32
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# define MRB_FLT_MANT_DIG FLT_MANT_DIG
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# define MRB_FLT_EPSILON FLT_EPSILON
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# define MRB_FLT_DIG FLT_DIG
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# define MRB_FLT_MIN_EXP FLT_MIN_EXP
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# define MRB_FLT_MIN FLT_MIN
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# define MRB_FLT_MIN_10_EXP FLT_MIN_10_EXP
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# define MRB_FLT_MAX_EXP FLT_MAX_EXP
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# define MRB_FLT_MAX FLT_MAX
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# define MRB_FLT_MAX_10_EXP FLT_MAX_10_EXP
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# else /* not MRB_USE_FLOAT32 */
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# define MRB_FLT_MANT_DIG DBL_MANT_DIG
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# define MRB_FLT_EPSILON DBL_EPSILON
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# define MRB_FLT_DIG DBL_DIG
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# define MRB_FLT_MIN_EXP DBL_MIN_EXP
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# define MRB_FLT_MIN DBL_MIN
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# define MRB_FLT_MIN_10_EXP DBL_MIN_10_EXP
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# define MRB_FLT_MAX_EXP DBL_MAX_EXP
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# define MRB_FLT_MAX DBL_MAX
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# define MRB_FLT_MAX_10_EXP DBL_MAX_10_EXP
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# endif /* MRB_USE_FLOAT32 */
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#endif /* MRB_NO_FLOAT */
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MRB_END_DECL
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#endif /* MRUBY_NUMERIC_H */
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