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Side by Side Diff: runtime/lib/object_patch.dart

Issue 2965723002: VM: Reland Inline instance object hash code into object header on 64bit. (Closed)
Patch Set: Fix snapshot incompatibility that sank Flutter Gallery Created 3 years, 5 months ago
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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 int _getHash(obj) native "Object_getHash";
6 int _setHash(obj, hash) native "Object_setHash";
7
5 @patch 8 @patch
6 class Object { 9 class Object {
7 // The VM has its own implementation of equals. 10 // The VM has its own implementation of equals.
8 @patch 11 @patch
9 bool operator ==(other) native "Object_equals"; 12 bool operator ==(other) native "Object_equals";
10 13
11 // Helpers used to implement hashCode. If a hashCode is used, we remember it 14 // Helpers used to implement hashCode. If a hashCode is used, we remember it
12 // in a weak table in the VM. A new hashCode value is calculated using a 15 // in a weak table in the VM (32 bit) or in the header of the object (64
13 // number generator. 16 // bit). A new hashCode value is calculated using a random number generator.
14 static final _hashCodeRnd = new Random(); 17 static final _hashCodeRnd = new Random();
15 18
16 // Shared static implementation for hashCode and _identityHashCode.
17 static _getHash(obj) native "Object_getHash";
18 static _setHash(obj, hash) native "Object_setHash";
19
20 static int _objectHashCode(obj) { 19 static int _objectHashCode(obj) {
21 var result = _getHash(obj); 20 var result = _getHash(obj);
22 if (result == 0) { 21 if (result == 0) {
23 // We want the hash to be a Smi value greater than 0. 22 // We want the hash to be a Smi value greater than 0.
24 result = _hashCodeRnd.nextInt(0x40000000); 23 result = _hashCodeRnd.nextInt(0x40000000);
25 while (result == 0) { 24 do {
26 result = _hashCodeRnd.nextInt(0x40000000); 25 result = _hashCodeRnd.nextInt(0x40000000);
27 } 26 } while (result == 0);
28 _setHash(obj, result); 27 _setHash(obj, result);
29 } 28 }
30 return result; 29 return result;
31 } 30 }
32 31
33 @patch 32 @patch
34 int get hashCode => _objectHashCode(this); 33 int get hashCode => _objectHashCode(this);
35 int get _identityHashCode => _objectHashCode(this); 34 int get _identityHashCode => _objectHashCode(this);
36 35
37 @patch 36 @patch
(...skipping 35 matching lines...) Expand 10 before | Expand all | Expand 10 after
73 native "Object_as"; 72 native "Object_as";
74 73
75 static _symbolMapToStringMap(Map<Symbol, dynamic> map) { 74 static _symbolMapToStringMap(Map<Symbol, dynamic> map) {
76 var result = new Map<String, dynamic>(); 75 var result = new Map<String, dynamic>();
77 map.forEach((Symbol key, value) { 76 map.forEach((Symbol key, value) {
78 result[internal.Symbol.getName(key)] = value; 77 result[internal.Symbol.getName(key)] = value;
79 }); 78 });
80 return result; 79 return result;
81 } 80 }
82 } 81 }
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