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Merged r22308. [ruby-dev:39637]

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* hash.c (rb_hash): always return a fixnum value because a return
  value of rb_hash may be used as a hash value itself and bignums have
  no unique VALUE.

* test/ruby/test_hash.rb: add a test for above.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@25661 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2009-11-05 12:22:24 +00:00
parent 60a40ecaf6
commit ee3e66e7a6
4 changed files with 32 additions and 12 deletions
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10
ChangeLog
View file

@ -1,8 +1,10 @@
Thu Nov 5 20:49:47 2009 NARUSE, Yui <naruse@ruby-lang.org>
Sun Feb 15 03:50:21 2009 Yusuke Endoh <mame@tsg.ne.jp>
* gc.c (rb_obj_id): a Fixnum which is beyond signed long
was converted to a Bignum in calculating its hash.
[ruby-dev:39637]
* hash.c (rb_hash): always return a fixnum value because a return
value of rb_hash may be used as a hash value itself and bignums have
no unique VALUE.
* test/ruby/test_hash.rb: add a test for above.
Thu Nov 5 12:06:35 2009 NARUSE, Yui <naruse@ruby-lang.org>

2
gc.c
View file

@ -2142,7 +2142,7 @@ rb_obj_id(obj)
return (SYM2ID(obj) * sizeof(RVALUE) + (4 << 2)) | FIXNUM_FLAG;
}
if (SPECIAL_CONST_P(obj)) {
return LONG2FIX((long)obj);
return LONG2NUM((long)obj);
}
return (VALUE)((long)obj|FIXNUM_FLAG);
}

19
hash.c
View file

@ -83,7 +83,19 @@ VALUE
rb_hash(obj)
VALUE obj;
{
return rb_funcall(obj, id_hash, 0);
VALUE hval = rb_funcall(obj, id_hash, 0);
retry:
switch (TYPE(hval)) {
case T_FIXNUM:
return hval;
case T_BIGNUM:
return LONG2FIX(((long*)(RBIGNUM_DIGITS(hval)))[0]);
default:
hval = rb_to_int(hval);
goto retry;
}
}
static int
@ -104,10 +116,7 @@ rb_any_hash(a)
break;
default:
hval = rb_funcall(a, id_hash, 0);
if (!FIXNUM_P(hval)) {
hval = rb_funcall(hval, '%', 1, INT2FIX(536870923));
}
hval = rb_hash(a);
hnum = (int)FIX2LONG(hval);
}
hnum <<= 1;

13
test/ruby/test_hash.rb
View file

@ -637,7 +637,16 @@ class TestHash < Test::Unit::TestCase
def test_hash_hash
assert_equal({0=>2,11=>1}.hash, {11=>1,0=>2}.hash)
assert_equal({:a=>2**29}.hash, {:a=>2**29}.hash)
assert_equal({:a=>2**61}.hash, {:a=>2**61}.hash)
end
def test_hash_bignum_hash
x = 2<<(32-3)-1
assert_equal({x=>1}.hash, {x=>1}.hash)
x = 2<<(64-3)-1
assert_equal({x=>1}.hash, {x=>1}.hash)
o = Object.new
def o.hash; 2<<100; end
assert_equal({x=>1}.hash, {x=>1}.hash)
end
end