Martin Kustermann
16ddfc1565
This makes explicit downcasts more efficient by re-using the optimizations we already have for implicit downcasts. For implicit/explicit as checks we use the symbol to distinguish which exception to throw if the check fails. So this does not actually require unification of _CastError and _TypeError. Issue https://github.com/dart-lang/sdk/issues/34582 Issue https://github.com/dart-lang/sdk/issues/30632 Issue https://github.com/dart-lang/sdk/issues/30571 Change-Id: I7b8818d2698e249c90a3e1b8790bad69ada649a9 Reviewed-on: https://dart-review.googlesource.com/c/78748 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
75 lines
2.5 KiB
Dart
75 lines
2.5 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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// part of "core_patch.dart";
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@pragma("vm:exact-result-type", "dart:core#_Smi")
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int _getHash(obj) native "Object_getHash";
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void _setHash(obj, hash) native "Object_setHash";
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@patch
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@pragma("vm:entry-point")
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class Object {
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// The VM has its own implementation of equals.
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@patch
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@pragma("vm:exact-result-type", bool)
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bool operator ==(other) native "Object_equals";
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// Helpers used to implement hashCode. If a hashCode is used, we remember it
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// in a weak table in the VM (32 bit) or in the header of the object (64
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// bit). A new hashCode value is calculated using a random number generator.
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static final _hashCodeRnd = new Random();
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static int _objectHashCode(obj) {
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var result = _getHash(obj);
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if (result == 0) {
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// We want the hash to be a Smi value greater than 0.
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result = _hashCodeRnd.nextInt(0x40000000);
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do {
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result = _hashCodeRnd.nextInt(0x40000000);
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} while (result == 0);
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_setHash(obj, result);
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}
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return result;
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}
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@patch
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int get hashCode => _objectHashCode(this);
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int get _identityHashCode => _objectHashCode(this);
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@patch
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String toString() native "Object_toString";
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// A statically dispatched version of Object.toString.
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static String _toString(obj) native "Object_toString";
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@patch
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@pragma("vm:entry-point")
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dynamic noSuchMethod(Invocation invocation) {
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// TODO(regis): Remove temp constructor identifier 'withInvocation'.
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throw new NoSuchMethodError.withInvocation(this, invocation);
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}
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@patch
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@pragma("vm:exact-result-type", "dart:core#_Type")
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Type get runtimeType native "Object_runtimeType";
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@pragma("vm:entry-point")
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@pragma("vm:exact-result-type", bool)
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static bool _haveSameRuntimeType(a, b) native "Object_haveSameRuntimeType";
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// Call this function instead of inlining instanceof, thus collecting
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// type feedback and reducing code size of unoptimized code.
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@pragma("vm:entry-point")
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bool _instanceOf(instantiatorTypeArguments, functionTypeArguments, type)
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native "Object_instanceOf";
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// Group of functions for implementing fast simple instance of.
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@pragma("vm:entry-point")
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bool _simpleInstanceOf(type) native "Object_simpleInstanceOf";
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@pragma("vm:entry-point")
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bool _simpleInstanceOfTrue(type) => true;
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@pragma("vm:entry-point")
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bool _simpleInstanceOfFalse(type) => false;
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}
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