internal override void GenerateMethodBody(TypeCompilationState compilationState, BindingDiagnosticBag diagnostics)
{
var F = new SyntheticBoundNodeFactory(this, this.SyntaxNode, compilationState, diagnostics);
try
{
ParameterSymbol parameter = Parameters[0];
if (parameter.Type.IsErrorType())
{
F.CloseMethod(F.ThrowNull());
return;
}
var retExpr = F.Call(
F.This(),
ContainingType.GetMembersUnordered().OfType <SynthesizedRecordObjEquals>().Single(),
F.Convert(F.SpecialType(SpecialType.System_Object), F.Parameter(parameter)));
F.CloseMethod(F.Block(F.Return(retExpr)));
}
catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
{
diagnostics.Add(ex.Diagnostic);
F.CloseMethod(F.ThrowNull());
}
}
internal override void GenerateMethodBody(TypeCompilationState compilationState, DiagnosticBag diagnostics)
{
var F = new SyntheticBoundNodeFactory(this, ContainingType.GetNonNullSyntaxNode(), compilationState, diagnostics);
try
{
var other = F.Parameter(Parameters[0]);
BoundExpression?retExpr;
// This method is the strongly-typed Equals method where the parameter type is
// the containing type.
if (ContainingType.BaseTypeNoUseSiteDiagnostics.IsObjectType())
{
if (_equalityContract.GetMethod is null)
{
// The equality contract isn't usable, an error was reported elsewhere
F.CloseMethod(F.ThrowNull());
return;
}
if (_equalityContract.IsStatic || !_equalityContract.Type.Equals(DeclaringCompilation.GetWellKnownType(WellKnownType.System_Type), TypeCompareKind.AllIgnoreOptions))
{
// There is a signature mismatch, an error was reported elsewhere
F.CloseMethod(F.ThrowNull());
return;
}
// There are no base record types.
// The definition of the method is as follows
//
// virtual bool Equals(T other) =>
// other != null &&
// EqualityContract == other.EqualityContract &&
// field1 == other.field1 && ... && fieldN == other.fieldN;
// other != null
Debug.Assert(!other.Type.IsStructType());
retExpr = F.ObjectNotEqual(other, F.Null(F.SpecialType(SpecialType.System_Object)));
// EqualityContract == other.EqualityContract
var contractsEqual = F.Call(receiver: null, F.WellKnownMethod(WellKnownMember.System_Type__op_Equality),
F.Property(F.This(), _equalityContract),
F.Property(other, _equalityContract));
retExpr = F.LogicalAnd(retExpr, contractsEqual);
}
else
{
MethodSymbol?baseEquals = ContainingType.GetMembersUnordered().OfType <SynthesizedRecordBaseEquals>().Single().OverriddenMethod;
if (baseEquals is null || !baseEquals.ContainingType.Equals(ContainingType.BaseTypeNoUseSiteDiagnostics, TypeCompareKind.AllIgnoreOptions) ||
baseEquals.ReturnType.SpecialType != SpecialType.System_Boolean)
{
// There was a problem with overriding of base equals, an error was reported elsewhere
F.CloseMethod(F.ThrowNull());
return;
}
// There are base record types.
// The definition of the method is as follows, and baseEquals
// is the corresponding method on the nearest base record type to
// delegate to:
//
// virtual bool Equals(Derived other) =>
// base.Equals((Base)other) &&
// field1 == other.field1 && ... && fieldN == other.fieldN;
retExpr = F.Call(
F.Base(baseEquals.ContainingType),
baseEquals,
F.Convert(baseEquals.Parameters[0].Type, other));
}
// field1 == other.field1 && ... && fieldN == other.fieldN
var fields = ArrayBuilder <FieldSymbol> .GetInstance();
bool foundBadField = false;
foreach (var f in ContainingType.GetFieldsToEmit())
{
if (!f.IsStatic)
{
fields.Add(f);
var parameterType = f.Type;
if (parameterType.IsUnsafe())
{
diagnostics.Add(ErrorCode.ERR_BadFieldTypeInRecord, f.Locations.FirstOrNone(), parameterType);
foundBadField = true;
}
else if (parameterType.IsRestrictedType())
{
// We'll have reported a diagnostic elsewhere (SourceMemberFieldSymbol.TypeChecks)
foundBadField = true;
}
}
}
if (fields.Count > 0 && !foundBadField)
{
retExpr = MethodBodySynthesizer.GenerateFieldEquals(
retExpr,
other,
fields,
F);
}
fields.Free();
F.CloseMethod(F.Block(F.Return(retExpr)));
}
catch (SyntheticBoundNodeFactory.MissingPredefinedMember ex)
{
diagnostics.Add(ex.Diagnostic);
F.CloseMethod(F.ThrowNull());
}
}