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rational.c: infinity in power

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* rational.c (nurat_expt): return Infinity due to overflow.
  [ruby-core:79686] [Bug #13242]:

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57688 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-02-22 23:28:26 +00:00
parent 3f6aeba69a
commit 06010b2b05
3 changed files with 12 additions and 0 deletions
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2
numeric.c
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@ -3913,6 +3913,8 @@ int_pow(long x, unsigned long y)
VALUE v; VALUE v;
bignum: bignum:
v = rb_big_pow(rb_int2big(x), LONG2NUM(y)); v = rb_big_pow(rb_int2big(x), LONG2NUM(y));
if (RB_FLOAT_TYPE_P(v)) /* infinity due to overflow */
return v;
if (z != 1) v = rb_big_mul(rb_int2big(neg ? -z : z), v); if (z != 1) v = rb_big_mul(rb_int2big(neg ? -z : z), v);
return v; return v;
} }

4
rational.c
View file

@ -1042,6 +1042,10 @@ nurat_expt(VALUE self, VALUE other)
num = ONE; num = ONE;
den = ONE; den = ONE;
} }
if (RB_FLOAT_TYPE_P(num)) { /* infinity due to overflow */
if (RB_FLOAT_TYPE_P(den)) return DBL2NUM(NAN);
return num;
}
return f_rational_new2(CLASS_OF(self), num, den); return f_rational_new2(CLASS_OF(self), num, den);
} }
} }

6
test/ruby/test_rational.rb
View file

@ -955,6 +955,12 @@ class Rational_Test < Test::Unit::TestCase
assert_raise(ZeroDivisionError, bug5713) { Rational(0, 1) ** Rational(-2,3) } assert_raise(ZeroDivisionError, bug5713) { Rational(0, 1) ** Rational(-2,3) }
end end
def test_power_overflow
bug = '[ruby-core:79686] [Bug #13242]: Infinity due to overflow'
x = EnvUtil.suppress_warning {4r**40000000}
assert_predicate x, :infinite?, bug
end
def test_positive_p def test_positive_p
assert_predicate(1/2r, :positive?) assert_predicate(1/2r, :positive?)
assert_not_predicate(-1/2r, :positive?) assert_not_predicate(-1/2r, :positive?)