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[flow] Part 2 Issue 3658 - Forward IfNullSet let expressions in the CFE.
This is a small change that allows forwarding let expressions for IfNullSets in the CFE. Since we now store the promotion information for a written expression in an if-statement, the CFE builds a let expression and it's not recognized by flow analysis. To fix this, we add a forward so flow analysis recognizes that it's the same expression that it's trying to find. language/inference_update_4/assignment_promotion_in_if_statement_test passes from this change. Bug: dart-lang/language#3658 Change-Id: I4ec99de036498869b0d9c5c652ca748d9f5e570a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/391861 Reviewed-by: Johnni Winther <[email protected]> Reviewed-by: Paul Berry <[email protected]> Commit-Queue: Kallen Tu <[email protected]>
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lines changed

‎pkg/front_end/lib/src/type_inference/inference_visitor.dart‎

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@@ -6002,6 +6002,12 @@ class InferenceVisitorImpl extends InferenceVisitorBase
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replacement = new Let(readVariable, conditional)
60036003
..fileOffset = node.fileOffset;
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}
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// Forward the expression in cases where flow analysis needs to use the
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// expression information. For example, for keeping the promotion in the
6008+
// following if statement in `if ((x ??= 2) == null) { ... }`.
6009+
flowAnalysis.forwardExpression(replacement, writeResult.expression);
6010+
60056011
return createNullAwareExpressionInferenceResult(
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inferredType, replacement, nullAwareGuards);
60076013
}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart‎

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// Copyright (c) 2024, 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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// Tests the promotion of assignment expressions in if statements as described
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// by https://github.com/dart-lang/language/issues/3658
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int? nullableInt() => 1;
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notEqualNull_assignIfNull() {
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int? x = null;
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if ((x ??= nullableInt()) != null) {
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x.isEven; // x promoted to int
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}
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}
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notEqualNullNull_eq() {
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int? x = null;
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if ((x = nullableInt()) != null) {
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x.isEven; // x promoted to int
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}
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}
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is_eq() {
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int? x = null;
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if ((x = nullableInt()) is int) {
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x.isEven; // x promoted to int
28+
}
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}
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is_plusEq() {
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num x = 2;
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if ((x += 1) is int) {
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x.isEven; // x promoted to int
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}
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}
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is_postfix() {
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num x = 2;
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if ((x++) is int) {
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// No promotion because the value being is checked is the value of `x`
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// before the increment, and that value isn't relevant after the increment
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// occurs.
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x.isEven; // Error.
45+
}
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}
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is_prefix() {
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num x = 2;
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if ((++x) is int) {
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x.isEven; // x promoted to int
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}
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}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.strong.expect‎

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library;
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//
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// Problems in library:
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//
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// pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
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// Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
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// x.isEven; // Error.
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// ^^^^^^
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//
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import self as self;
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import "dart:core" as core;
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static method nullableInt() → core::int?
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return 1;
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static method notEqualNull_assignIfNull() → dynamic {
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has-declared-initializer core::int? x = null;
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if(!((let final core::int? #t1 = x in #t1 == null ?{core::int?} x = self::nullableInt() : #t1{core::int}) == null)) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method notEqualNullNull_eq() → dynamic {
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has-declared-initializer core::int? x = null;
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if(!((x = self::nullableInt()) == null)) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_eq() → dynamic {
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has-declared-initializer core::int? x = null;
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if((x = self::nullableInt()) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_plusEq() → dynamic {
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core::num x = 2;
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if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_postfix() → dynamic {
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core::num x = 2;
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if((let final core::num #t2 = x in let final core::num #t3 = x = #t2.{core::num::+}(1){(core::num) → core::num} in #t2) is core::int) {
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invalid-expression "pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
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Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
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x.isEven; // Error.
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^^^^^^" in x{<unresolved>}.isEven;
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}
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}
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static method is_prefix() → dynamic {
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core::num x = 2;
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if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.strong.modular.expect‎

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library;
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//
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// Problems in library:
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//
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// pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
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// Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
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// x.isEven; // Error.
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// ^^^^^^
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//
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import self as self;
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import "dart:core" as core;
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static method nullableInt() → core::int?
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return 1;
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static method notEqualNull_assignIfNull() → dynamic {
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has-declared-initializer core::int? x = null;
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if(!((let final core::int? #t1 = x in #t1 == null ?{core::int?} x = self::nullableInt() : #t1{core::int}) == null)) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method notEqualNullNull_eq() → dynamic {
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has-declared-initializer core::int? x = null;
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if(!((x = self::nullableInt()) == null)) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_eq() → dynamic {
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has-declared-initializer core::int? x = null;
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if((x = self::nullableInt()) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_plusEq() → dynamic {
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core::num x = 2;
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if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_postfix() → dynamic {
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core::num x = 2;
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if((let final core::num #t2 = x in let final core::num #t3 = x = #t2.{core::num::+}(1){(core::num) → core::num} in #t2) is core::int) {
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invalid-expression "pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
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Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
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x.isEven; // Error.
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^^^^^^" in x{<unresolved>}.isEven;
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}
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}
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static method is_prefix() → dynamic {
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core::num x = 2;
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if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.strong.outline.expect‎

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library;
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import self as self;
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import "dart:core" as core;
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static method nullableInt() → core::int?
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;
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static method notEqualNull_assignIfNull() → dynamic
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;
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static method notEqualNullNull_eq() → dynamic
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;
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static method is_eq() → dynamic
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;
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static method is_plusEq() → dynamic
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;
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static method is_postfix() → dynamic
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;
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static method is_prefix() → dynamic
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;

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.strong.transformed.expect‎

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library;
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//
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// Problems in library:
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//
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// pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
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// Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
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// x.isEven; // Error.
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// ^^^^^^
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//
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import self as self;
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import "dart:core" as core;
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static method nullableInt() → core::int?
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return 1;
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static method notEqualNull_assignIfNull() → dynamic {
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has-declared-initializer core::int? x = null;
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if(!((let final core::int? #t1 = x in #t1 == null ?{core::int?} x = self::nullableInt() : #t1{core::int}) == null)) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method notEqualNullNull_eq() → dynamic {
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has-declared-initializer core::int? x = null;
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if(!((x = self::nullableInt()) == null)) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_eq() → dynamic {
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has-declared-initializer core::int? x = null;
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if((x = self::nullableInt()) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_plusEq() → dynamic {
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core::num x = 2;
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if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}
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static method is_postfix() → dynamic {
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core::num x = 2;
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if((let final core::num #t2 = x in let final core::num #t3 = x = #t2.{core::num::+}(1){(core::num) → core::num} in #t2) is core::int) {
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invalid-expression "pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
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Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
44+
x.isEven; // Error.
45+
^^^^^^" in x{<unresolved>}.isEven;
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}
47+
}
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static method is_prefix() → dynamic {
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core::num x = 2;
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if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
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x{core::int}.{core::int::isEven}{core::bool};
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}
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}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.textual_outline.expect‎

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int? nullableInt() => 1;
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notEqualNull_assignIfNull() {}
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notEqualNullNull_eq() {}
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is_eq() {}
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is_plusEq() {}
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is_postfix() {}
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is_prefix() {}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.textual_outline_modelled.expect‎

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int? nullableInt() => 1;
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is_eq() {}
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is_plusEq() {}
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is_postfix() {}
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is_prefix() {}
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notEqualNullNull_eq() {}
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notEqualNull_assignIfNull() {}

‎pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart.weak.expect‎

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//
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// Problems in component:
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//
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// sdk/lib/core/core.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/async/async.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/collection/collection.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/_internal/vm_shared/lib/compact_hash.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/concurrent/concurrent.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/convert/convert.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/developer/developer.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/ffi/ffi.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
19+
//
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// sdk/lib/internal/internal.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/isolate/isolate.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
23+
//
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// sdk/lib/math/math.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
25+
//
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// sdk/lib/mirrors/mirrors.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
27+
//
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// sdk/lib/typed_data/typed_data.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
30+
// sdk/lib/_internal/vm/bin/vmservice_io.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
31+
//
32+
// sdk/lib/vmservice/vmservice.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
33+
//
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// sdk/lib/_internal/vm/bin/builtin.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
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// sdk/lib/html/dartium/nativewrappers.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
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//
38+
// sdk/lib/io/io.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
39+
//
40+
// sdk/lib/cli/cli.dart: Error: Loaded library is compiled with sound null safety and cannot be used in compilation for unsound null safety.
41+
//
42+
library;
43+
//
44+
// Problems in library:
45+
//
46+
// pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
47+
// Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
48+
// x.isEven; // Error.
49+
// ^^^^^^
50+
//
51+
import self as self;
52+
import "dart:core" as core;
53+
54+
static method nullableInt() → core::int?
55+
return 1;
56+
static method notEqualNull_assignIfNull() → dynamic {
57+
has-declared-initializer core::int? x = null;
58+
if(!((let final core::int? #t1 = x in #t1 == null ?{core::int?} x = self::nullableInt() : #t1{core::int}) == null)) {
59+
x{core::int}.{core::int::isEven}{core::bool};
60+
}
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}
62+
static method notEqualNullNull_eq() → dynamic {
63+
has-declared-initializer core::int? x = null;
64+
if(!((x = self::nullableInt()) == null)) {
65+
x{core::int}.{core::int::isEven}{core::bool};
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}
67+
}
68+
static method is_eq() → dynamic {
69+
has-declared-initializer core::int? x = null;
70+
if((x = self::nullableInt()) is core::int) {
71+
x{core::int}.{core::int::isEven}{core::bool};
72+
}
73+
}
74+
static method is_plusEq() → dynamic {
75+
core::num x = 2;
76+
if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
77+
x{core::int}.{core::int::isEven}{core::bool};
78+
}
79+
}
80+
static method is_postfix() → dynamic {
81+
core::num x = 2;
82+
if((let final core::num #t2 = x in let final core::num #t3 = x = #t2.{core::num::+}(1){(core::num) → core::num} in #t2) is core::int) {
83+
invalid-expression "pkg/front_end/testcases/inference_update_4/assignment_promotion_in_if_statement.dart:44:7: Error: The getter 'isEven' isn't defined for the class 'num'.
84+
Try correcting the name to the name of an existing getter, or defining a getter or field named 'isEven'.
85+
x.isEven; // Error.
86+
^^^^^^" in x{<unresolved>}.isEven;
87+
}
88+
}
89+
static method is_prefix() → dynamic {
90+
core::num x = 2;
91+
if((x = x.{core::num::+}(1){(core::num) → core::num}) is core::int) {
92+
x{core::int}.{core::int::isEven}{core::bool};
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}
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}

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