sra@google.com
77b13f738a
This fixes the following problems: 1. low 15 bits of string hash always zero. 2. [].hashCode crashes 3. hashCode of bool is not a SMI. Review URL: https://codereview.chromium.org//11412121 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@15216 260f80e4-7a28-3924-810f-c04153c831b5
82 lines
1.9 KiB
Dart
82 lines
1.9 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// dart2js specific test to make sure hashCode on intercepted types behaves as
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// intended.
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class Hasher {
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confuse(x) => [1, 'x', true, null, x].last;
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hash(x) => confuse(x).hashCode;
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}
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// Hashing via [hash] should be forced to use the general interceptor, but the
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// local x.hashCode calls might be optimized.
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var hash = new Hasher().hash;
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check(value1, value2) {
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var h1 = hash(value1);
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var h2 = hash(value2);
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Expect.isTrue(h1 is int);
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Expect.isTrue(h2 is int);
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Expect.isFalse(h1 == h2);
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// We expect that the hash function is reasonable quality - there are some
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// difference in the low bits.
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Expect.isFalse((h1 & 0xf) == (h2 & 0xf));
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// Quality check - the values should be SMIs for efficient arithmetic.
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Expect.equals((h1 & 0x1fffffff), h1);
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Expect.equals((h2 & 0x1fffffff), h2);
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}
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bools() {
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check(true, false);
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Expect.equals(true.hashCode, hash(true)); // First can be optimized.
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Expect.equals(false.hashCode, hash(false));
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}
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ints() {
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var i1 = 100;
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var i2 = 101;
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check(i1, i2);
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Expect.equals(i1.hashCode, hash(i1));
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Expect.equals(i2.hashCode, hash(i2));
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}
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lists() {
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var list1 = [];
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var list2 = [];
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check(list1, list2);
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Expect.equals(list1.hashCode, hash(list1));
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Expect.equals(list2.hashCode, hash(list2));
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}
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strings() {
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var str1 = 'a';
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var str2 = 'b';
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var str3 = 'c';
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check(str1, str2);
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check(str1, str3);
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check(str2, str3);
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Expect.equals(str1.hashCode, hash(str1));
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Expect.equals(str2.hashCode, hash(str2));
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Expect.equals(str3.hashCode, hash(str3));
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Expect.equals(0xA2E9442, 'a'.hashCode);
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Expect.equals(0x0DB819B, 'b'.hashCode);
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Expect.equals(0xEBA5D59, 'c'.hashCode);
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}
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main() {
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bools();
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ints();
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lists();
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strings();
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}
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