| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import "package:expect/expect.dart"; |
| |
| // dart2js specific test to make sure hashCode on intercepted types behaves as |
| // intended. |
| |
| @pragma('dart2js:noInline') |
| @pragma('dart2js:assumeDynamic') |
| confuse(x) => x; |
| |
| class Hasher { |
| hash(x) => confuse(x).hashCode; |
| } |
| |
| // Hashing via [hash] should be forced to use the general interceptor, but the |
| // local x.hashCode calls might be optimized. |
| var hash = new Hasher().hash; |
| |
| check(value1, value2, {identityHashCode}) { |
| var h1 = hash(value1); |
| var h2 = hash(value2); |
| Expect.isTrue(h1 is int); |
| Expect.isTrue(h2 is int); |
| |
| // Quality check - the values should be SMIs for efficient arithmetic. |
| Expect.equals((h1 & 0x3fffffff), h1); |
| Expect.equals((h2 & 0x3fffffff), h2); |
| |
| // If we're checking the (randomized) identity hash code function, |
| // we cannot guarantee anything about the actual hash code values. |
| if (identityHashCode) return; |
| |
| // We expect that the hash function is reasonable quality - there |
| // are some difference in the low bits. |
| Expect.isFalse(h1 == h2); |
| Expect.isFalse((h1 & 0xf) == (h2 & 0xf)); |
| } |
| |
| bools() { |
| check(true, false, identityHashCode: false); |
| |
| Expect.equals(true.hashCode, hash(true)); // First can be optimized. |
| Expect.equals(false.hashCode, hash(false)); |
| } |
| |
| ints() { |
| var i1 = 100; |
| var i2 = 101; |
| check(i1, i2, identityHashCode: false); |
| Expect.equals(i1.hashCode, hash(i1)); |
| Expect.equals(i2.hashCode, hash(i2)); |
| } |
| |
| lists() { |
| var list1 = []; |
| var list2 = []; |
| check(list1, list2, identityHashCode: true); |
| |
| Expect.equals(list1.hashCode, hash(list1)); |
| Expect.equals(list2.hashCode, hash(list2)); |
| } |
| |
| strings() { |
| var str1 = 'a'; |
| var str2 = 'b'; |
| var str3 = 'c'; |
| check(str1, str2, identityHashCode: false); |
| check(str1, str3, identityHashCode: false); |
| check(str2, str3, identityHashCode: false); |
| |
| Expect.equals(str1.hashCode, hash(str1)); |
| Expect.equals(str2.hashCode, hash(str2)); |
| Expect.equals(str3.hashCode, hash(str3)); |
| |
| Expect.equals(0xA2E9442, 'a'.hashCode); |
| Expect.equals(0x0DB819B, 'b'.hashCode); |
| Expect.equals(0xEBA5D59, 'c'.hashCode); |
| } |
| |
| main() { |
| bools(); |
| ints(); |
| lists(); |
| strings(); |
| } |