Add experiment flag for Value Classes

Change-Id: I94b42676ed233c3d421ac41be1c74dd90c74501e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/156005
Reviewed-by: Dmitry Stefantsov <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Javier López-Contreras <[email protected]>

Author: javierlcontreras

pkg/analyzer/lib/src/dart/analysis/experiments.g.dart

@@ -22,6 +22,7 @@ const _knownFeatures = <String, ExperimentalFeature>{
   EnableString.set_literals: ExperimentalFeatures.set_literals,
   EnableString.spread_collections: ExperimentalFeatures.spread_collections,
   EnableString.triple_shift: ExperimentalFeatures.triple_shift,
+  EnableString.value_class: ExperimentalFeatures.value_class,
   EnableString.variance: ExperimentalFeatures.variance,
 };
 
@@ -34,6 +35,7 @@ List<bool> _buildExperimentalFlagsArray() => <bool>[
       true, // set-literals
       true, // spread-collections
       IsEnabledByDefault.triple_shift,
+      IsEnabledByDefault.value_class,
       IsEnabledByDefault.variance,
     ];
 
@@ -64,6 +66,9 @@ class EnableString {
   /// String to enable the experiment "triple-shift"
   static const String triple_shift = 'triple-shift';
 
+  /// String to enable the experiment "value-class"
+  static const String value_class = 'value-class';
+
   /// String to enable the experiment "variance"
   static const String variance = 'variance';
 }
@@ -141,8 +146,17 @@ class ExperimentalFeatures {
     firstSupportedVersion: null,
   );
 
-  static const variance = ExperimentalFeature(
+  static const value_class = ExperimentalFeature(
     index: 8,
+    enableString: EnableString.value_class,
+    isEnabledByDefault: IsEnabledByDefault.value_class,
+    isExpired: IsExpired.value_class,
+    documentation: 'Value class',
+    firstSupportedVersion: null,
+  );
+
+  static const variance = ExperimentalFeature(
+    index: 9,
     enableString: EnableString.variance,
     isEnabledByDefault: IsEnabledByDefault.variance,
     isExpired: IsExpired.variance,
@@ -178,6 +192,9 @@ class IsEnabledByDefault {
   /// Default state of the experiment "triple-shift"
   static const bool triple_shift = false;
 
+  /// Default state of the experiment "value-class"
+  static const bool value_class = false;
+
   /// Default state of the experiment "variance"
   static const bool variance = false;
 }
@@ -210,6 +227,9 @@ class IsExpired {
   /// Expiration status of the experiment "triple-shift"
   static const bool triple_shift = false;
 
+  /// Expiration status of the experiment "value-class"
+  static const bool value_class = false;
+
   /// Expiration status of the experiment "variance"
   static const bool variance = false;
 }
@@ -244,6 +264,9 @@ mixin _CurrentState {
   /// Current state for the flag "triple-shift"
   bool get triple_shift => isEnabled(ExperimentalFeatures.triple_shift);
 
+  /// Current state for the flag "value-class"
+  bool get value_class => isEnabled(ExperimentalFeatures.value_class);
+
   /// Current state for the flag "variance"
   bool get variance => isEnabled(ExperimentalFeatures.variance);
 

pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart

@@ -19,6 +19,7 @@ enum ExperimentalFlag {
   setLiterals,
   spreadCollections,
   tripleShift,
+  valueClass,
   variance,
 }
 
@@ -32,6 +33,7 @@ const Version enableNonfunctionTypeAliasesVersion = const Version(2, 10);
 const Version enableSetLiteralsVersion = const Version(2, 2);
 const Version enableSpreadCollectionsVersion = const Version(2, 2);
 const Version enableTripleShiftVersion = const Version(2, 10);
+const Version enableValueClassVersion = const Version(2, 10);
 const Version enableVarianceVersion = const Version(2, 10);
 
 ExperimentalFlag parseExperimentalFlag(String flag) {
@@ -54,6 +56,8 @@ ExperimentalFlag parseExperimentalFlag(String flag) {
       return ExperimentalFlag.spreadCollections;
     case "triple-shift":
       return ExperimentalFlag.tripleShift;
+    case "value-class":
+      return ExperimentalFlag.valueClass;
     case "variance":
       return ExperimentalFlag.variance;
   }
@@ -70,6 +74,7 @@ const Map<ExperimentalFlag, bool> defaultExperimentalFlags = {
   ExperimentalFlag.setLiterals: true,
   ExperimentalFlag.spreadCollections: true,
   ExperimentalFlag.tripleShift: false,
+  ExperimentalFlag.valueClass: false,
   ExperimentalFlag.variance: false,
 };
 
@@ -83,6 +88,7 @@ const Map<ExperimentalFlag, bool> expiredExperimentalFlags = {
   ExperimentalFlag.setLiterals: true,
   ExperimentalFlag.spreadCollections: true,
   ExperimentalFlag.tripleShift: false,
+  ExperimentalFlag.valueClass: false,
   ExperimentalFlag.variance: false,
 };
 

tools/experimental_features.yaml

@@ -104,6 +104,8 @@ features:
     help: "Alternative invalidation strategy for incremental compilation"
     category: "CFE"
 
+  value-class:
+    help: "Value class"
 #
 # Flags below this line are shipped, retired, or rejected, cannot be specified
 # on the command line, and will eventually be removed.