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Flow analysis: Pin down initialization behaviors before fixing #1785.
https://github.com/dart-lang/language/issues/1785 has a wide enough impact that its fix will have to be bundled in with a language version (i.e. future versions of Dart will have to reproduce the old buggy behavior for code that's not opted in to the latest language version). Therefore, we'll have to maintain tests of the behavior both before and after the fix. This CL is the first step in that process, adding tests that validate the current (buggy) behavior. Bug: https://github.com/dart-lang/language/issues/1785 Change-Id: I78f17999ac1cbc096a312ef977db24654e06a263 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/210400 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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@ -11,6 +11,16 @@ finalLocalBool(int? x) {
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}
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}
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finalLocalBool_untyped(int? x) {
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final b = x == null;
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if (!b) {
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// No promotion due to https://github.com/dart-lang/language/issues/1785
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x;
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} else {
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x;
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}
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}
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localBool(int? x) {
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bool b = x == null;
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if (!b) {
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@ -20,6 +30,16 @@ localBool(int? x) {
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}
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}
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localBool_untyped(int? x) {
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var b = x == null;
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if (!b) {
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// No promotion due to https://github.com/dart-lang/language/issues/1785
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x;
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} else {
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x;
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}
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}
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localBool_assigned(int? x, bool b1) {
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bool b2 = b1;
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b2 = x == null;
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@ -30,6 +50,16 @@ localBool_assigned(int? x, bool b1) {
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}
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}
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localBool_assigned_untyped(int? x, bool b1) {
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var b2 = b1;
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b2 = x == null;
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if (!b2) {
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/*nonNullable*/ x;
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} else {
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x;
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}
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}
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localBool_assignedDynamic(int? x, bool b1) {
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dynamic b2 = b1;
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b2 = x == null;
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@ -49,6 +79,15 @@ parameter_assigned(int? x, bool b) {
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}
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}
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parameter_assigned_untyped(int? x, b) {
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b = x == null;
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if (!b) {
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/*nonNullable*/ x;
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} else {
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x;
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}
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}
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parameter_assignedDynamic(int? x, dynamic b) {
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b = x == null;
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if (!b) {
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@ -69,6 +108,17 @@ lateFinalLocalBool(int? x) {
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}
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}
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lateFinalLocalBool_untyped(int? x) {
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late final b = x == null;
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if (!b) {
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// We don't promote based on the initializers of late locals because we
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// don't know when they execute.
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x;
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} else {
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x;
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}
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}
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lateLocalBool(int? x) {
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late bool b = x == null;
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if (!b) {
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@ -80,6 +130,17 @@ lateLocalBool(int? x) {
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}
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}
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lateLocalBool_untyped(int? x) {
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late var b = x == null;
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if (!b) {
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// We don't promote based on the initializers of late locals because we
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// don't know when they execute.
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x;
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} else {
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x;
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}
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}
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lateLocalBool_assignedAndInitialized(int? x, bool b1) {
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late bool b2 = b1;
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b2 = x == null;
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@ -90,6 +151,16 @@ lateLocalBool_assignedAndInitialized(int? x, bool b1) {
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}
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}
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lateLocalBool_assignedAndInitialized_untyped(int? x, bool b1) {
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late var b2 = b1;
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b2 = x == null;
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if (!b2) {
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/*nonNullable*/ x;
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} else {
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x;
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}
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}
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lateLocalBool_assignedButNotInitialized(int? x) {
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late bool b;
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b = x == null;
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@ -100,6 +171,16 @@ lateLocalBool_assignedButNotInitialized(int? x) {
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}
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}
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lateLocalBool_assignedButNotInitialized_untyped(int? x) {
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late var b;
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b = x == null;
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if (!b) {
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/*nonNullable*/ x;
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} else {
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x;
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}
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}
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rebaseWithDemotion(int? x, int? y, int? z, int? a) {
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x;
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y;
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@ -13,6 +13,11 @@ localVariable() {
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x;
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}
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localVariable_null() {
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var x = null;
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x;
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}
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localVariable_hasInitializer(num a) {
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var x = a;
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x = 1;
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@ -0,0 +1,205 @@
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// Copyright (c) 2021, 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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// @dart=2.13
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import '../../static_type_helper.dart';
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// This test checks whether a local boolean variable can be used to perform type
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// promotion, if that variable is implicitly typed.
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//
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// Due to https://github.com/dart-lang/language/issues/1785, initializer
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// expressions on implicitly typed variables are ignored for the purposes of
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// type promotion (however, later assignments to those variables still do
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// influence promotion). To avoid introducing breaking language changes, we
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// intend to preserve this behavior until a specific Dart language version.
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// This test verifies that for code that is not opted in to the newer behavior,
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// the old (buggy) behavior persists.
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parameterUnmodified(int? x) {
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{
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late final b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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late var b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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final b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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var b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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}
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parameterModifiedLater(int? x, int? y) {
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x = y;
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{
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late final b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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late var b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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final b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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var b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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}
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localVariableInitialized(int? y) {
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int? x = y;
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{
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late final b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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late var b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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final b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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var b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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}
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localVariableModifiedLater(int? y) {
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int? x;
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x = y;
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{
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late final b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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late var b = x != null;
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// We wouldn't promote based on the initializers of late locals anyhow,
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// because we don't know when they execute.
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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late var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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final b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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final b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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{
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var b = x != null;
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if (b) x.expectStaticType<Exactly<int?>>();
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}
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{
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var b;
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b = x != null;
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if (b) x.expectStaticType<Exactly<int>>();
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}
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}
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main() {
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parameterUnmodified(null);
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parameterUnmodified(0);
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parameterModifiedLater(null, null);
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parameterModifiedLater(null, 0);
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localVariableInitialized(null);
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localVariableInitialized(0);
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localVariableModifiedLater(null);
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localVariableModifiedLater(0);
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}
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