Johnni Winther
440b4cd84e
This preserves the invariant that method invocations and property sets with an interface target handle static types at the call site. This is a prerequisite to improving dart2js with implicit checks. With this we can mark dynamic invocations a statically safe and discover when instance methods don't need to check parameter types. Change-Id: Ife7a3f947952b3c1f73316b922b2aa107343068e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/95400 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
69 lines
1.9 KiB
Dart
69 lines
1.9 KiB
Dart
// Copyright (c) 2019, 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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import 'dart:collection';
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/*element: dynamicIndex:Specializer=[!Index]*/
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@pragma('dart2js:noInline')
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dynamicIndex(var list) {
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return list[0]; // This not known to be an indexable primitive.
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}
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/*element: unknownListIndex:Specializer=[!Index]*/
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@pragma('dart2js:noInline')
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unknownListIndex(List list) {
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return list[0]; // This not known to be an indexable primitive.
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}
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/*element: possiblyNullMutableListIndex:Specializer=[Index]*/
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@pragma('dart2js:noInline')
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possiblyNullMutableListIndex(bool b) {
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var list = b ? [0] : null;
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return list[0];
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}
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/*element: mutableListIndex:Specializer=[Index]*/
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@pragma('dart2js:noInline')
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mutableListIndex() {
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var list = [0];
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return list[0];
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}
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/*element: mutableListDynamicIndex:Specializer=[Index]*/
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@pragma('dart2js:noInline')
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mutableListDynamicIndex(dynamic index) {
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var list = [0];
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return list[index]; // CFE inserts an implicit cast of the index.
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}
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/*strong.element: mutableDynamicListDynamicIndex:Specializer=[!Index]*/
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/*omit.element: mutableDynamicListDynamicIndex:Specializer=[Index]*/
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@pragma('dart2js:noInline')
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@pragma('dart2js:disableFinal')
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mutableDynamicListDynamicIndex(dynamic index) {
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dynamic list = [0];
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return list[index];
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}
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main() {
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dynamicIndex([]);
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dynamicIndex({});
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unknownListIndex([]);
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unknownListIndex(new MyList());
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possiblyNullMutableListIndex(true);
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possiblyNullMutableListIndex(false);
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mutableListIndex();
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mutableListDynamicIndex(0);
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mutableListDynamicIndex('');
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mutableDynamicListDynamicIndex(0);
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mutableDynamicListDynamicIndex('');
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}
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class MyList<E> extends ListBase<E> {
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E operator [](int index) => null;
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void operator []=(int index, E value) {}
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int get length => 0;
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void set length(int value) {}
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}
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