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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 patch class Object { | 5 patch class Object { |
6 | 6 |
7 // Helpers used to implement hashCode. If a hashCode is used, we remember it | 7 // Helpers used to implement hashCode. If a hashCode is used, we remember it |
8 // in a weak table in the VM. A new hashCode value is calculated using a | 8 // in a weak table in the VM. A new hashCode value is calculated using a |
9 // number generator. | 9 // number generator. |
10 static final _hashCodeRnd = new Random(); | 10 static final _hashCodeRnd = new Random(); |
11 | 11 |
12 static _getHash(obj) native "Object_getHash"; | 12 static _getHash(obj) native "Object_getHash"; |
13 static _setHash(obj, hash) native "Object_setHash"; | 13 static _setHash(obj, hash) native "Object_setHash"; |
14 | 14 |
15 /* patch */ int get hashCode { | 15 /* patch */ int get hashCode => _identityHashCode; |
| 16 |
| 17 int get _identityHashCode { |
16 var result = _getHash(this); | 18 var result = _getHash(this); |
17 if (result == 0) { | 19 if (result == 0) { |
18 // We want the hash to be a Smi value greater than 0. | 20 // We want the hash to be a Smi value greater than 0. |
19 result = _hashCodeRnd.nextInt(0x40000000); | 21 result = _hashCodeRnd.nextInt(0x40000000); |
20 while (result == 0) { | 22 while (result == 0) { |
21 result = _hashCodeRnd.nextInt(0x40000000); | 23 result = _hashCodeRnd.nextInt(0x40000000); |
22 } | 24 } |
23 _setHash(this, result); | 25 _setHash(this, result); |
24 } | 26 } |
25 return result; | 27 return result; |
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65 }); | 67 }); |
66 return result; | 68 return result; |
67 } | 69 } |
68 | 70 |
69 int get _cid native "Object_cid"; | 71 int get _cid native "Object_cid"; |
70 | 72 |
71 _leftShiftWithMask32(count, mask) { | 73 _leftShiftWithMask32(count, mask) { |
72 return (this << count) & mask; | 74 return (this << count) & mask; |
73 } | 75 } |
74 } | 76 } |
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