Synthesize equality operators for records. (#46497)

Closes #46381.
dotnet · Aug 4, 2020 · 932828f · 932828f
1 parent e93d356
commit 932828f
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Showing 13 changed files with 789 additions and 143 deletions.
diff --git a/src/Compilers/CSharp/Portable/Compilation/SyntaxTreeSemanticModel.cs b/src/Compilers/CSharp/Portable/Compilation/SyntaxTreeSemanticModel.cs
@@ -178,7 +178,7 @@ internal override IOperation GetOperationWorker(CSharpSyntaxNode node, Cancellat
                 case AccessorDeclarationSyntax accessor:
                     model = (accessor.Body != null || accessor.ExpressionBody != null) ? GetOrAddModel(node) : null;
                     break;
-                case RecordDeclarationSyntax { ParameterList: { }, PrimaryConstructorBaseType: { } } recordDeclaration when TryGetSynthesizedRecordConstructor(recordDeclaration) is SynthesizedRecordConstructor ctor:
+                case RecordDeclarationSyntax { ParameterList: { }, PrimaryConstructorBaseType: { } } recordDeclaration when TryGetSynthesizedRecordConstructor(recordDeclaration) is SynthesizedRecordConstructor:
                     model = GetOrAddModel(recordDeclaration);
                     break;
                 default:

diff --git a/src/Compilers/CSharp/Portable/Symbols/Source/SourceMemberContainerSymbol.cs b/src/Compilers/CSharp/Portable/Symbols/Source/SourceMemberContainerSymbol.cs
@@ -2073,6 +2073,13 @@ private void CheckForEqualityAndGetHashCode(DiagnosticBag diagnostics)
                 return;
             }
 
+            if (IsRecord)
+            {
+                // For records the warnings reported below are simply going to echo record specific errors,
+                // producing more noise.
+                return;
+            }
+
             bool hasOp = this.GetOperators(WellKnownMemberNames.EqualityOperatorName).Any() ||
                 this.GetOperators(WellKnownMemberNames.InequalityOperatorName).Any();
             bool overridesEquals = this.TypeOverridesObjectMethod("Equals");
@@ -3029,6 +3036,7 @@ private void AddSynthesizedRecordMembersIfNecessary(MembersAndInitializersBuilde
             addOtherEquals();
             addObjectEquals(thisEquals);
             addHashCode(equalityContract);
+            addEqualityOperators();
 
             memberSignatures.Free();
 
@@ -3361,6 +3369,12 @@ void addOtherEquals()
                     members.Add(new SynthesizedRecordBaseEquals(this, memberOffset: members.Count, diagnostics));
                 }
             }
+
+            void addEqualityOperators()
+            {
+                members.Add(new SynthesizedRecordEqualityOperator(this, memberOffset: members.Count, diagnostics));
+                members.Add(new SynthesizedRecordInequalityOperator(this, memberOffset: members.Count, diagnostics));
+            }
         }
 
         private void AddSynthesizedConstructorsIfNecessary(ArrayBuilder<Symbol> members, ArrayBuilder<ArrayBuilder<FieldOrPropertyInitializer.Builder>> staticInitializers, DiagnosticBag diagnostics)

diff --git a/src/Compilers/CSharp/Portable/Symbols/Source/SourceOrdinaryMethodSymbolBase.cs b/src/Compilers/CSharp/Portable/Symbols/Source/SourceOrdinaryMethodSymbolBase.cs
@@ -311,7 +311,7 @@ public override ImmutableArray<Location> Locations
             }
         }
 
-        internal override int ParameterCount
+        internal sealed override int ParameterCount
         {
             get
             {

diff --git a/src/Compilers/CSharp/Portable/Symbols/Source/SourceUserDefinedConversionSymbol.cs b/src/Compilers/CSharp/Portable/Symbols/Source/SourceUserDefinedConversionSymbol.cs
@@ -3,10 +3,12 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.Collections.Immutable;
 using System.Diagnostics;
 using Microsoft.CodeAnalysis.CSharp.Symbols;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Text;
+using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.CSharp.Symbols
 {
@@ -43,6 +45,10 @@ private SourceUserDefinedConversionSymbol(
                 containingType,
                 location,
                 syntax,
+                MakeDeclarationModifiers(syntax, location, diagnostics),
+                hasBody: syntax.HasAnyBody(),
+                isExpressionBodied: syntax.Body == null && syntax.ExpressionBody != null,
+                isIterator: SyntaxFacts.HasYieldOperations(syntax.Body),
                 diagnostics)
         {
             CheckForBlockAndExpressionBody(
@@ -54,31 +60,39 @@ private SourceUserDefinedConversionSymbol(
             }
         }
 
-        internal new ConversionOperatorDeclarationSyntax GetSyntax()
+        internal ConversionOperatorDeclarationSyntax GetSyntax()
         {
             Debug.Assert(syntaxReferenceOpt != null);
             return (ConversionOperatorDeclarationSyntax)syntaxReferenceOpt.GetSyntax();
         }
 
-        protected override ParameterListSyntax ParameterListSyntax
+        protected override int GetParameterCountFromSyntax()
         {
-            get
-            {
-                return GetSyntax().ParameterList;
-            }
+            return GetSyntax().ParameterList.ParameterCount;
         }
 
-        protected override TypeSyntax ReturnTypeSyntax
+        protected override Location ReturnTypeLocation
         {
             get
             {
-                return GetSyntax().Type;
+                return GetSyntax().Type.Location;
             }
         }
 
         internal override bool GenerateDebugInfo
         {
             get { return true; }
         }
+
+        internal sealed override OneOrMany<SyntaxList<AttributeListSyntax>> GetAttributeDeclarations()
+        {
+            return OneOrMany.Create(this.GetSyntax().AttributeLists);
+        }
+
+        protected override (TypeWithAnnotations ReturnType, ImmutableArray<ParameterSymbol> Parameters) MakeParametersAndBindReturnType(DiagnosticBag diagnostics)
+        {
+            ConversionOperatorDeclarationSyntax declarationSyntax = GetSyntax();
+            return MakeParametersAndBindReturnType(declarationSyntax, declarationSyntax.Type, diagnostics);
+        }
     }
 }
diff --git a/src/Compilers/CSharp/Portable/Symbols/Source/SourceUserDefinedOperatorSymbol.cs b/src/Compilers/CSharp/Portable/Symbols/Source/SourceUserDefinedOperatorSymbol.cs
@@ -3,8 +3,10 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.Collections.Immutable;
 using System.Diagnostics;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
+using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.CSharp.Symbols
 {
@@ -20,8 +22,7 @@ public static SourceUserDefinedOperatorSymbol CreateUserDefinedOperatorSymbol(
             string name = OperatorFacts.OperatorNameFromDeclaration(syntax);
 
             return new SourceUserDefinedOperatorSymbol(
-                containingType, name, location, syntax, diagnostics,
-                syntax.Body == null && syntax.ExpressionBody != null);
+                containingType, name, location, syntax, diagnostics);
         }
 
         // NOTE: no need to call WithUnsafeRegionIfNecessary, since the signature
@@ -32,14 +33,17 @@ private SourceUserDefinedOperatorSymbol(
             string name,
             Location location,
             OperatorDeclarationSyntax syntax,
-            DiagnosticBag diagnostics,
-            bool isExpressionBodied) :
+            DiagnosticBag diagnostics) :
             base(
                 MethodKind.UserDefinedOperator,
                 name,
                 containingType,
                 location,
                 syntax,
+                MakeDeclarationModifiers(syntax, location, diagnostics),
+                hasBody: syntax.HasAnyBody(),
+                isExpressionBodied: syntax.Body == null && syntax.ExpressionBody != null,
+                isIterator: SyntaxFacts.HasYieldOperations(syntax.Body),
                 diagnostics)
         {
             CheckForBlockAndExpressionBody(
@@ -51,31 +55,39 @@ private SourceUserDefinedOperatorSymbol(
             }
         }
 
-        internal new OperatorDeclarationSyntax GetSyntax()
+        internal OperatorDeclarationSyntax GetSyntax()
         {
             Debug.Assert(syntaxReferenceOpt != null);
             return (OperatorDeclarationSyntax)syntaxReferenceOpt.GetSyntax();
         }
 
-        protected override ParameterListSyntax ParameterListSyntax
+        protected override int GetParameterCountFromSyntax()
         {
-            get
-            {
-                return GetSyntax().ParameterList;
-            }
+            return GetSyntax().ParameterList.ParameterCount;
         }
 
-        protected override TypeSyntax ReturnTypeSyntax
+        protected override Location ReturnTypeLocation
         {
             get
             {
-                return GetSyntax().ReturnType;
+                return GetSyntax().ReturnType.Location;
             }
         }
 
         internal override bool GenerateDebugInfo
         {
             get { return true; }
         }
+
+        internal sealed override OneOrMany<SyntaxList<AttributeListSyntax>> GetAttributeDeclarations()
+        {
+            return OneOrMany.Create(this.GetSyntax().AttributeLists);
+        }
+
+        protected override (TypeWithAnnotations ReturnType, ImmutableArray<ParameterSymbol> Parameters) MakeParametersAndBindReturnType(DiagnosticBag diagnostics)
+        {
+            OperatorDeclarationSyntax declarationSyntax = GetSyntax();
+            return MakeParametersAndBindReturnType(declarationSyntax, declarationSyntax.ReturnType, diagnostics);
+        }
     }
 }