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ES6: Make sure we do not store -0 as the key in Map/Set

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BUG=v8:3515
LOG=Y
R=adamk@chromium.org, dslomov@chromium.org

Review URL: https://codereview.chromium.org/478683002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23204 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
arv@chromium.org 2014-08-19 15:15:41 +00:00
parent eb7fcad7c5
commit 8d189e84b4
2 changed files with 27 additions and 10 deletions
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14
src/collection.js
View File

@ -49,6 +49,13 @@ function SetAddJS(key) {
throw MakeTypeError('incompatible_method_receiver',
['Set.prototype.add', this]);
}
// Normalize -0 to +0 as required by the spec.
// Even though we use SameValueZero as the comparison for the keys we don't
// want to ever store -0 as the key since the key is directly exposed when
// doing iteration.
if (key === 0) {
key = 0;
}
return %SetAdd(this, key);
}
@ -186,6 +193,13 @@ function MapSetJS(key, value) {
throw MakeTypeError('incompatible_method_receiver',
['Map.prototype.set', this]);
}
// Normalize -0 to +0 as required by the spec.
// Even though we use SameValueZero as the comparison for the keys we don't
// want to ever store -0 as the key since the key is directly exposed when
// doing iteration.
if (key === 0) {
key = 0;
}
return %MapSet(this, key, value);
}

23
test/mjsunit/es6/collections.js
View File

@ -117,7 +117,8 @@ function TestMapBehavior2(m) {
TestMapping(m, i / 10, new Object);
TestMapping(m, 'key-' + i, new Object);
}
var keys = [ +0, -0, +Infinity, -Infinity, true, false, null, undefined ];
// -0 is handled in TestMinusZeroMap
var keys = [ 0, +Infinity, -Infinity, true, false, null, undefined ];
for (var i = 0; i < keys.length; i++) {
TestMapping(m, keys[i], new Object);
}
@ -495,24 +496,26 @@ for (var i = 9; i >= 0; i--) {
(function TestMinusZeroSet() {
var m = new Set();
m.add(0);
m.add(-0);
assertEquals(1, m.size);
assertTrue(m.has(0));
assertTrue(m.has(-0));
var s = new Set();
s.add(-0);
assertSame(0, s.values().next().value);
s.add(0);
assertEquals(1, s.size);
assertTrue(s.has(0));
assertTrue(s.has(-0));
})();
(function TestMinusZeroMap() {
var m = new Map();
m.set(0, 'plus');
m.set(-0, 'minus');
assertSame(0, m.keys().next().value);
m.set(0, 'plus');
assertEquals(1, m.size);
assertTrue(m.has(0));
assertTrue(m.has(-0));
assertEquals('minus', m.get(0));
assertEquals('minus', m.get(-0));
assertEquals('plus', m.get(0));
assertEquals('plus', m.get(-0));
})();