2 ** @file mruby/numeric.h - Numeric, Integer, Float, Fixnum class
4 ** See Copyright Notice in mruby.h
7 #ifndef MRUBY_NUMERIC_H
8 #define MRUBY_NUMERIC_H
13 * Numeric class and it's sub-classes.
15 * Integer, Float and Fixnum
19 #define TYPED_POSFIXABLE(f,t) ((f) <= (t)MRB_INT_MAX)
20 #define TYPED_NEGFIXABLE(f,t) ((f) >= (t)MRB_INT_MIN)
21 #define TYPED_FIXABLE(f,t) (TYPED_POSFIXABLE(f,t) && TYPED_NEGFIXABLE(f,t))
22 #define POSFIXABLE(f) TYPED_POSFIXABLE(f,mrb_int)
23 #define NEGFIXABLE(f) TYPED_NEGFIXABLE(f,mrb_int)
24 #define FIXABLE(f) TYPED_FIXABLE(f,mrb_int)
25 #ifndef MRB_WITHOUT_FLOAT
27 #define FIXABLE_FLOAT(f) ((f)>=-9223372036854775808.0 && (f)<9223372036854775808.0)
29 #define FIXABLE_FLOAT(f) TYPED_FIXABLE(f,mrb_float)
33 #ifndef MRB_WITHOUT_FLOAT
34 MRB_API mrb_value mrb_flo_to_fixnum(mrb_state *mrb, mrb_value val);
36 MRB_API mrb_value mrb_fixnum_to_str(mrb_state *mrb, mrb_value x, mrb_int base);
37 /* ArgumentError if format string doesn't match /%(\.[0-9]+)?[aAeEfFgG]/ */
38 #ifndef MRB_WITHOUT_FLOAT
39 MRB_API mrb_value mrb_float_to_str(mrb_state *mrb, mrb_value x, const char *fmt);
40 MRB_API int mrb_float_to_cstr(mrb_state *mrb, char *buf, size_t len, const char *fmt, mrb_float f);
41 MRB_API mrb_float mrb_to_flo(mrb_state *mrb, mrb_value x);
42 MRB_API mrb_value mrb_int_value(mrb_state *mrb, mrb_float f);
45 MRB_API mrb_value mrb_num_plus(mrb_state *mrb, mrb_value x, mrb_value y);
46 MRB_API mrb_value mrb_num_minus(mrb_state *mrb, mrb_value x, mrb_value y);
47 MRB_API mrb_value mrb_num_mul(mrb_state *mrb, mrb_value x, mrb_value y);
50 #define __has_builtin(x) 0
53 #if (defined(__GNUC__) && __GNUC__ >= 5) || \
54 (__has_builtin(__builtin_add_overflow) && \
55 __has_builtin(__builtin_sub_overflow) && \
56 __has_builtin(__builtin_mul_overflow))
57 # define MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
61 // Clang 3.8 and 3.9 have problem compiling mruby in 32-bit mode, when MRB_INT64 is set
62 // because of missing __mulodi4 and similar functions in its runtime. We need to use custom
63 // implementation for them.
65 #ifdef MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
66 #if defined(__clang__) && (__clang_major__ == 3) && (__clang_minor__ >= 8) && \
67 defined(MRB_32BIT) && defined(MRB_INT64)
68 #undef MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
72 #ifdef MRB_HAVE_TYPE_GENERIC_CHECKED_ARITHMETIC_BUILTINS
74 #ifndef MRB_WORD_BOXING
77 # define WBCHK(x) !FIXABLE(x)
80 static inline mrb_bool
81 mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
83 return __builtin_add_overflow(augend, addend, sum) || WBCHK(*sum);
86 static inline mrb_bool
87 mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
89 return __builtin_sub_overflow(minuend, subtrahend, difference) || WBCHK(*difference);
92 static inline mrb_bool
93 mrb_int_mul_overflow(mrb_int multiplier, mrb_int multiplicand, mrb_int *product)
95 return __builtin_mul_overflow(multiplier, multiplicand, product) || WBCHK(*product);
102 #define MRB_UINT_MAKE2(n) uint ## n ## _t
103 #define MRB_UINT_MAKE(n) MRB_UINT_MAKE2(n)
104 #define mrb_uint MRB_UINT_MAKE(MRB_INT_BIT)
106 #define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1 - MRB_FIXNUM_SHIFT))
108 static inline mrb_bool
109 mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
111 mrb_uint x = (mrb_uint)augend;
112 mrb_uint y = (mrb_uint)addend;
113 mrb_uint z = (mrb_uint)(x + y);
115 return !!(((x ^ z) & (y ^ z)) & MRB_INT_OVERFLOW_MASK);
118 static inline mrb_bool
119 mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
121 mrb_uint x = (mrb_uint)minuend;
122 mrb_uint y = (mrb_uint)subtrahend;
123 mrb_uint z = (mrb_uint)(x - y);
124 *difference = (mrb_int)z;
125 return !!(((x ^ z) & (~y ^ z)) & MRB_INT_OVERFLOW_MASK);
128 static inline mrb_bool
129 mrb_int_mul_overflow(mrb_int multiplier, mrb_int multiplicand, mrb_int *product)
131 #if MRB_INT_BIT == 32
132 int64_t n = (int64_t)multiplier * multiplicand;
133 *product = (mrb_int)n;
136 if (multiplier > 0) {
137 if (multiplicand > 0) {
138 if (multiplier > MRB_INT_MAX / multiplicand) return TRUE;
141 if (multiplicand < MRB_INT_MAX / multiplier) return TRUE;
145 if (multiplicand > 0) {
146 if (multiplier < MRB_INT_MAX / multiplicand) return TRUE;
149 if (multiplier != 0 && multiplicand < MRB_INT_MAX / multiplier) return TRUE;
152 *product = multiplier * multiplicand;
157 #undef MRB_INT_OVERFLOW_MASK
160 #undef MRB_UINT_MAKE2
164 #ifndef MRB_WITHOUT_FLOAT
168 # define MRB_FLT_RADIX FLT_RADIX
170 # ifdef MRB_USE_FLOAT
171 # define MRB_FLT_MANT_DIG FLT_MANT_DIG
172 # define MRB_FLT_EPSILON FLT_EPSILON
173 # define MRB_FLT_DIG FLT_DIG
174 # define MRB_FLT_MIN_EXP FLT_MIN_EXP
175 # define MRB_FLT_MIN FLT_MIN
176 # define MRB_FLT_MIN_10_EXP FLT_MIN_10_EXP
177 # define MRB_FLT_MAX_EXP FLT_MAX_EXP
178 # define MRB_FLT_MAX FLT_MAX
179 # define MRB_FLT_MAX_10_EXP FLT_MAX_10_EXP
181 # else /* not MRB_USE_FLOAT */
182 # define MRB_FLT_MANT_DIG DBL_MANT_DIG
183 # define MRB_FLT_EPSILON DBL_EPSILON
184 # define MRB_FLT_DIG DBL_DIG
185 # define MRB_FLT_MIN_EXP DBL_MIN_EXP
186 # define MRB_FLT_MIN DBL_MIN
187 # define MRB_FLT_MIN_10_EXP DBL_MIN_10_EXP
188 # define MRB_FLT_MAX_EXP DBL_MAX_EXP
189 # define MRB_FLT_MAX DBL_MAX
190 # define MRB_FLT_MAX_10_EXP DBL_MAX_10_EXP
191 # endif /* MRB_USE_FLOAT */
192 #endif /* MRB_WITHOUT_FLOAT */
196 #endif /* MRUBY_NUMERIC_H */