[270] | 1 | /*
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| 2 | ** mruby/numeric.h - Numeric, Integer, Float, Fixnum class
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| 3 | **
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| 4 | ** See Copyright Notice in mruby.h
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| 5 | */
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| 6 |
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| 7 | #ifndef MRUBY_NUMERIC_H
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| 8 | #define MRUBY_NUMERIC_H
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| 9 |
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| 10 | #include "mruby/common.h"
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| 11 |
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| 12 | /**
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| 13 | * Numeric class and it's sub-classes.
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| 14 | *
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| 15 | * Integer, Float and Fixnum
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| 16 | */
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| 17 | MRB_BEGIN_DECL
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| 18 |
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| 19 | #define POSFIXABLE(f) ((f) <= MRB_INT_MAX)
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| 20 | #define NEGFIXABLE(f) ((f) >= MRB_INT_MIN)
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| 21 | #define FIXABLE(f) (POSFIXABLE(f) && NEGFIXABLE(f))
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| 22 |
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| 23 | MRB_API mrb_value mrb_flo_to_fixnum(mrb_state *mrb, mrb_value val);
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| 24 | MRB_API mrb_value mrb_fixnum_to_str(mrb_state *mrb, mrb_value x, int base);
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| 25 | /* ArgumentError if format string doesn't match /%(\.[0-9]+)?[aAeEfFgG]/ */
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| 26 | MRB_API mrb_value mrb_float_to_str(mrb_state *mrb, mrb_value x, const char *fmt);
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| 27 | MRB_API mrb_float mrb_to_flo(mrb_state *mrb, mrb_value x);
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| 28 |
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| 29 | mrb_value mrb_fixnum_plus(mrb_state *mrb, mrb_value x, mrb_value y);
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| 30 | mrb_value mrb_fixnum_minus(mrb_state *mrb, mrb_value x, mrb_value y);
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| 31 | mrb_value mrb_fixnum_mul(mrb_state *mrb, mrb_value x, mrb_value y);
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| 32 | mrb_value mrb_num_div(mrb_state *mrb, mrb_value x, mrb_value y);
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| 33 |
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| 34 | #define MRB_UINT_MAKE2(n) uint ## n ## _t
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| 35 | #define MRB_UINT_MAKE(n) MRB_UINT_MAKE2(n)
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| 36 | #define mrb_uint MRB_UINT_MAKE(MRB_INT_BIT)
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| 37 |
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| 38 | #define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1 - MRB_FIXNUM_SHIFT))
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| 39 |
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| 40 | /* Idea from Potion: https://github.com/perl11/potion (MIT) */
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| 41 | #if (defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 4))) \
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| 42 | || (defined(__GNUC__) && __GNUC__ >= 5)
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| 43 |
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| 44 | static inline mrb_bool
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| 45 | mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
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| 46 | {
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| 47 | mrb_bool of;
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| 48 |
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| 49 | #ifdef MRB_INT64
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| 50 | long long val;
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| 51 | of = __builtin_saddll_overflow(augend, addend, &val) ||
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| 52 | #else
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| 53 | int val;
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| 54 | of = __builtin_sadd_overflow(augend, addend, &val) ||
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| 55 | #endif
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| 56 | (val > MRB_INT_MAX) || (val < MRB_INT_MIN);
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| 57 |
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| 58 | *sum = (mrb_int) val;
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| 59 | return of;
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| 60 | }
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| 61 |
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| 62 | static inline mrb_bool
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| 63 | mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
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| 64 | {
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| 65 | mrb_bool of;
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| 66 |
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| 67 | #ifdef MRB_INT64
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| 68 | long long val;
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| 69 | of = __builtin_ssubll_overflow(minuend, subtrahend, &val) ||
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| 70 | #else
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| 71 | int val;
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| 72 | of = __builtin_ssub_overflow(minuend, subtrahend, &val) ||
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| 73 | #endif
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| 74 | (val > MRB_INT_MAX) || (val < MRB_INT_MIN);
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| 75 |
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| 76 | *difference = (mrb_int) val;
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| 77 | return of;
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| 78 | }
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| 79 | #else
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| 80 |
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| 81 | static inline mrb_bool
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| 82 | mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
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| 83 | {
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| 84 | mrb_uint x = (mrb_uint)augend;
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| 85 | mrb_uint y = (mrb_uint)addend;
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| 86 | mrb_uint z = (mrb_uint)(x + y);
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| 87 | *sum = (mrb_int)z;
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| 88 | return !!(((x ^ z) & (y ^ z)) & MRB_INT_OVERFLOW_MASK);
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| 89 | }
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| 90 |
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| 91 | static inline mrb_bool
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| 92 | mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
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| 93 | {
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| 94 | mrb_uint x = (mrb_uint)minuend;
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| 95 | mrb_uint y = (mrb_uint)subtrahend;
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| 96 | mrb_uint z = (mrb_uint)(x - y);
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| 97 | *difference = (mrb_int)z;
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| 98 | return !!(((x ^ z) & (~y ^ z)) & MRB_INT_OVERFLOW_MASK);
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| 99 | }
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| 100 |
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| 101 | #endif
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| 102 |
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| 103 | #undef MRB_INT_OVERFLOW_MASK
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| 104 | #undef mrb_uint
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| 105 | #undef MRB_UINT_MAKE
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| 106 | #undef MRB_UINT_MAKE2
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| 107 |
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| 108 | MRB_END_DECL
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| 109 |
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| 110 | #endif /* MRUBY_NUMERIC_H */
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