public TupleMethodSymbol(TupleTypeSymbol container, MethodSymbol underlyingMethod)
{
Debug.Assert(underlyingMethod.ConstructedFrom == (object)underlyingMethod);
_containingType = container;
TypeMap.Empty.WithAlphaRename(underlyingMethod, this, out _typeParameters);
_underlyingMethod = underlyingMethod.ConstructIfGeneric(TypeArguments);
}
public TupleFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleElementIndex)
: base(underlyingField)
{
Debug.Assert(container.UnderlyingNamedType.Equals(underlyingField.ContainingType, TypeCompareKind.IgnoreDynamicAndTupleNames) || this is TupleVirtualElementFieldSymbol,
"virtual fields should be represented by " + nameof(TupleVirtualElementFieldSymbol));
_containingTuple = container;
_tupleElementIndex = tupleElementIndex;
}
/// <summary>
/// Converts access to a tuple instance into access into the underlying ValueTuple(s).
///
/// For instance, tuple.Item8
/// produces fieldAccess(field=Item1, receiver=fieldAccess(field=Rest, receiver=ValueTuple for tuple))
/// </summary>
private BoundExpression MakeTupleFieldAccess(
CSharpSyntaxNode syntax,
FieldSymbol tupleField,
BoundExpression rewrittenReceiver,
ConstantValue constantValueOpt,
LookupResultKind resultKind)
{
var tupleType = tupleField.ContainingType;
NamedTypeSymbol currentLinkType = tupleType.TupleUnderlyingType;
FieldSymbol underlyingField = tupleField.TupleUnderlyingField;
if ((object)underlyingField == null)
{
// Use-site error must have been reported elsewhere.
return(_factory.BadExpression(tupleField.Type));
}
if (underlyingField.ContainingType != currentLinkType)
{
WellKnownMember wellKnownTupleRest = TupleTypeSymbol.GetTupleTypeMember(TupleTypeSymbol.RestPosition, TupleTypeSymbol.RestPosition);
var tupleRestField = (FieldSymbol)TupleTypeSymbol.GetWellKnownMemberInType(currentLinkType.OriginalDefinition, wellKnownTupleRest, _diagnostics, syntax);
if ((object)tupleRestField == null)
{
// error tolerance for cases when Rest is missing
return(_factory.BadExpression(tupleField.Type));
}
// make nested field accesses to Rest
do
{
FieldSymbol nestedFieldSymbol = tupleRestField.AsMember(currentLinkType);
rewrittenReceiver = _factory.Field(rewrittenReceiver, nestedFieldSymbol);
currentLinkType = currentLinkType.TypeArgumentsNoUseSiteDiagnostics[TupleTypeSymbol.RestPosition - 1].TupleUnderlyingType;
}while (underlyingField.ContainingType != currentLinkType);
}
// make a field access for the most local access
return(_factory.Field(rewrittenReceiver, underlyingField));
}
protected override bool HasImplicitTupleConversion(BoundExpression source, TypeSymbol destination, ref HashSet <DiagnosticInfo> useSiteDiagnostics)
{
if (source.Kind != BoundKind.TupleLiteral)
{
// source must be a tuple literal with no conversions
return(false);
}
var tupleExpression = (BoundTupleLiteral)source;
var arguments = tupleExpression.Arguments;
// check if the type is actually compatible type for a tuple of given cardinality
if (!destination.IsTupleOrCompatibleWithTupleOfCardinality(arguments.Length))
{
return(false);
}
var targetElementTypes = ArrayBuilder <TypeSymbol> .GetInstance(arguments.Length);
TupleTypeSymbol.AddElementTypes((NamedTypeSymbol)destination, targetElementTypes);
Debug.Assert(arguments.Length == targetElementTypes.Count);
try
{
// check arguments against flattened list of target element types
for (int i = 0; i < arguments.Length; i++)
{
var argument = arguments[i];
var result = ClassifyImplicitConversionFromExpression(argument, targetElementTypes[i], ref useSiteDiagnostics);
if (!result.Exists)
{
return(false);
}
}
return(true);
}
finally
{
targetElementTypes.Free();
}
}
private BoundDeconstructionConstructionStep MakeDeconstructionConstructionStep(CSharpSyntaxNode node, DiagnosticBag diagnostics,
ImmutableArray <BoundDeconstructValuePlaceholder> constructionInputs)
{
var tuple = TupleTypeSymbol.Create(locationOpt: null,
elementTypes: constructionInputs.SelectAsArray(e => e.Type),
elementLocations: default(ImmutableArray <Location>),
elementNames: default(ImmutableArray <string>),
compilation: Compilation,
diagnostics: diagnostics,
syntax: node);
var outputPlaceholder = new BoundDeconstructValuePlaceholder(node, tuple)
{
WasCompilerGenerated = true
};
BoundExpression construction = new BoundTupleLiteral(node, default(ImmutableArray <string>), constructionInputs.CastArray <BoundExpression>(), tuple);
return(new BoundDeconstructionConstructionStep(node, construction, outputPlaceholder));
}
public static ImmutableArray <TypeSymbol> GetElementTypesOfTupleOrCompatible(this TypeSymbol type)
{
if (type.IsTupleType)
{
return(((TupleTypeSymbol)type).TupleElementTypes);
}
// The following codepath should be very uncommon since it would be rare
// to see a tuple underlying type not represented as a tuple.
// It still might happen since tuple underlying types are creatable via public APIs
// and it is also possible that they would be passed in.
Debug.Assert(type.IsTupleCompatible());
// PERF: if allocations here become nuisance, consider caching the results
// in the type symbols that can actually be tuple compatible
var elementTypesBuilder = ArrayBuilder <TypeSymbol> .GetInstance();
TupleTypeSymbol.AddElementTypes((NamedTypeSymbol)type, elementTypesBuilder);
return(elementTypesBuilder.ToImmutableAndFree());
}
private PEParameterSymbol(
PEModuleSymbol moduleSymbol,
Symbol containingSymbol,
int ordinal,
bool isByRef,
TypeSymbolWithAnnotations type,
ImmutableArray <bool> extraAnnotations,
ParameterHandle handle,
int countOfCustomModifiers,
out bool isBad)
{
Debug.Assert((object)moduleSymbol != null);
Debug.Assert((object)containingSymbol != null);
Debug.Assert(ordinal >= 0);
Debug.Assert(!type.IsNull);
isBad = false;
_moduleSymbol = moduleSymbol;
_containingSymbol = containingSymbol;
_ordinal = (ushort)ordinal;
_handle = handle;
RefKind refKind = RefKind.None;
if (handle.IsNil)
{
refKind = isByRef ? RefKind.Ref : RefKind.None;
type = TupleTypeSymbol.TryTransformToTuple(type.TypeSymbol, out TupleTypeSymbol tuple) ?
TypeSymbolWithAnnotations.Create(tuple) :
type;
if (!extraAnnotations.IsDefault)
{
// https://github.com/dotnet/roslyn/issues/29821 any external annotation is taken to imply a `[NonNullTypes(true)]` context
type = NullableTypeDecoder.TransformType(type, extraAnnotations, nonNullTypesContext: NonNullTypesTrueContext.Instance);
}
_lazyCustomAttributes = ImmutableArray <CSharpAttributeData> .Empty;
_lazyHiddenAttributes = ImmutableArray <CSharpAttributeData> .Empty;
_lazyDefaultValue = ConstantValue.NotAvailable;
_lazyIsParams = ThreeState.False;
}
else
{
try
{
moduleSymbol.Module.GetParamPropsOrThrow(handle, out _name, out _flags);
}
catch (BadImageFormatException)
{
isBad = true;
}
if (isByRef)
{
ParameterAttributes inOutFlags = _flags & (ParameterAttributes.Out | ParameterAttributes.In);
if (inOutFlags == ParameterAttributes.Out)
{
refKind = RefKind.Out;
}
else if (moduleSymbol.Module.HasIsReadOnlyAttribute(handle))
{
refKind = RefKind.In;
}
else
{
refKind = RefKind.Ref;
}
}
// CONSIDER: Can we make parameter type computation lazy?
var typeSymbol = DynamicTypeDecoder.TransformType(type.TypeSymbol, countOfCustomModifiers, handle, moduleSymbol, refKind);
type = type.WithTypeAndModifiers(typeSymbol, type.CustomModifiers);
// Decode nullable before tuple types to avoid converting between
// NamedTypeSymbol and TupleTypeSymbol unnecessarily.
type = NullableTypeDecoder.TransformType(type, handle, moduleSymbol, nonNullTypesContext: this, extraAnnotations);
type = TupleTypeDecoder.DecodeTupleTypesIfApplicable(type, handle, moduleSymbol);
}
_type = type;
bool hasNameInMetadata = !string.IsNullOrEmpty(_name);
if (!hasNameInMetadata)
{
// As was done historically, if the parameter doesn't have a name, we give it the name "value".
_name = "value";
}
_packedFlags = new PackedFlags(refKind, attributesAreComplete: handle.IsNil, hasNameInMetadata: hasNameInMetadata);
Debug.Assert(refKind == this.RefKind);
Debug.Assert(hasNameInMetadata == this.HasNameInMetadata);
}
public TupleRenamedElementFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, string name, int tupleElementOrdinal, Location location)
: base(container, underlyingField, tupleElementOrdinal, location)
{
Debug.Assert(name != null);
Debug.Assert(name != underlyingField.Name);
_name = name;
}
public TupleFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleFieldId)
: base(underlyingField)
{
_containingTuple = container;
_tupleFieldId = tupleFieldId;
}
public TupleEventSymbol(TupleTypeSymbol container, EventSymbol underlyingEvent)
: base(underlyingEvent)
{
_containingType = container;
}
public TupleElementFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleFieldId, Location location)
: base(container, underlyingField, tupleFieldId)
{
_locations = location == null ? ImmutableArray<Location>.Empty : ImmutableArray.Create(location);
}
private BoundExpression MakeTupleCreationExpression(SyntaxNode syntax, NamedTypeSymbol type, ImmutableArray <BoundExpression> rewrittenArguments)
{
NamedTypeSymbol underlyingTupleType = type.TupleUnderlyingType ?? type;
Debug.Assert(underlyingTupleType.IsTupleCompatible());
ArrayBuilder <NamedTypeSymbol> underlyingTupleTypeChain = ArrayBuilder <NamedTypeSymbol> .GetInstance();
TupleTypeSymbol.GetUnderlyingTypeChain(underlyingTupleType, underlyingTupleTypeChain);
try
{
// make a creation expression for the smallest type
NamedTypeSymbol smallestType = underlyingTupleTypeChain.Pop();
ImmutableArray <BoundExpression> smallestCtorArguments = ImmutableArray.Create(rewrittenArguments,
underlyingTupleTypeChain.Count * (TupleTypeSymbol.RestPosition - 1),
smallestType.Arity);
var smallestCtor = (MethodSymbol)TupleTypeSymbol.GetWellKnownMemberInType(smallestType.OriginalDefinition,
TupleTypeSymbol.GetTupleCtor(smallestType.Arity),
_diagnostics,
syntax);
if ((object)smallestCtor == null)
{
return(_factory.BadExpression(type));
}
MethodSymbol smallestConstructor = smallestCtor.AsMember(smallestType);
BoundObjectCreationExpression currentCreation = new BoundObjectCreationExpression(syntax, smallestConstructor, null, smallestCtorArguments);
if (underlyingTupleTypeChain.Count > 0)
{
NamedTypeSymbol tuple8Type = underlyingTupleTypeChain.Peek();
var tuple8Ctor = (MethodSymbol)TupleTypeSymbol.GetWellKnownMemberInType(tuple8Type.OriginalDefinition,
TupleTypeSymbol.GetTupleCtor(TupleTypeSymbol.RestPosition),
_diagnostics,
syntax);
if ((object)tuple8Ctor == null)
{
return(_factory.BadExpression(type));
}
// make successively larger creation expressions containing the previous one
do
{
ImmutableArray <BoundExpression> ctorArguments = ImmutableArray.Create(rewrittenArguments,
(underlyingTupleTypeChain.Count - 1) * (TupleTypeSymbol.RestPosition - 1),
TupleTypeSymbol.RestPosition - 1)
.Add(currentCreation);
MethodSymbol constructor = tuple8Ctor.AsMember(underlyingTupleTypeChain.Pop());
currentCreation = new BoundObjectCreationExpression(syntax, constructor, null, ctorArguments);
}while (underlyingTupleTypeChain.Count > 0);
}
currentCreation = currentCreation.Update(
currentCreation.Constructor,
currentCreation.Arguments,
currentCreation.ArgumentNamesOpt,
currentCreation.ArgumentRefKindsOpt,
currentCreation.Expanded,
currentCreation.ArgsToParamsOpt,
currentCreation.ConstantValue,
currentCreation.InitializerExpressionOpt,
currentCreation.BinderOpt,
type);
return(currentCreation);
}
finally
{
underlyingTupleTypeChain.Free();
}
}
public TuplePropertySymbol(TupleTypeSymbol container, PropertySymbol underlyingProperty)
: base(underlyingProperty)
{
_containingType = container;
}
/// <summary>
/// For cases where the RHS of a deconstruction-declaration is a tuple literal, we merge type information from both the LHS and RHS.
/// For cases where the RHS of a deconstruction-assignment is a tuple literal, the type information from the LHS determines the merged type, since all variables have a type.
/// Returns null if a merged tuple type could not be fabricated.
/// </summary>
private static TypeSymbol MakeMergedTupleType(ArrayBuilder <DeconstructionVariable> lhsVariables, BoundTupleLiteral rhsLiteral, CSharpSyntaxNode syntax, CSharpCompilation compilation, DiagnosticBag diagnostics)
{
int leftLength = lhsVariables.Count;
int rightLength = rhsLiteral.Arguments.Length;
var typesBuilder = ArrayBuilder <TypeSymbol> .GetInstance(leftLength);
for (int i = 0; i < rightLength; i++)
{
BoundExpression element = rhsLiteral.Arguments[i];
TypeSymbol mergedType = element.Type;
if (i < leftLength)
{
var variable = lhsVariables[i];
if (variable.HasNestedVariables)
{
if (element.Kind == BoundKind.TupleLiteral)
{
// (variables) on the left and (elements) on the right
mergedType = MakeMergedTupleType(variable.NestedVariables, (BoundTupleLiteral)element, syntax, compilation, diagnostics);
}
else if ((object)mergedType == null)
{
// (variables) on the left and null on the right
Error(diagnostics, ErrorCode.ERR_DeconstructRequiresExpression, element.Syntax);
}
}
else
{
if ((object)variable.Single.Type != null)
{
// typed-variable on the left
mergedType = variable.Single.Type;
}
else if ((object)mergedType == null)
{
// typeless-variable on the left and typeless-element on the right
Error(diagnostics, ErrorCode.ERR_DeconstructCouldNotInferMergedType, syntax, variable.Syntax, element.Syntax);
}
}
}
else
{
if ((object)mergedType == null)
{
// a typeless element on the right, matching no variable on the left
Error(diagnostics, ErrorCode.ERR_DeconstructRequiresExpression, element.Syntax);
}
}
typesBuilder.Add(mergedType);
}
if (typesBuilder.Any(t => t == null))
{
typesBuilder.Free();
return(null);
}
return(TupleTypeSymbol.Create(locationOpt: null, elementTypes: typesBuilder.ToImmutableAndFree(), elementLocations: default(ImmutableArray <Location>), elementNames: default(ImmutableArray <string>), compilation: compilation, diagnostics: diagnostics));
}
private PEParameterSymbol(
PEModuleSymbol moduleSymbol,
Symbol containingSymbol,
int ordinal,
bool isByRef,
TypeSymbol type,
ParameterHandle handle,
int countOfCustomModifiers,
out bool isBad)
{
Debug.Assert((object)moduleSymbol != null);
Debug.Assert((object)containingSymbol != null);
Debug.Assert(ordinal >= 0);
Debug.Assert((object)type != null);
isBad = false;
_moduleSymbol = moduleSymbol;
_containingSymbol = containingSymbol;
_ordinal = (ushort)ordinal;
_handle = handle;
RefKind refKind = RefKind.None;
if (handle.IsNil)
{
refKind = isByRef ? RefKind.Ref : RefKind.None;
type = TupleTypeSymbol.TransformToTupleIfCompatible(type);
_type = type;
_lazyCustomAttributes = ImmutableArray <CSharpAttributeData> .Empty;
_lazyHiddenAttributes = ImmutableArray <CSharpAttributeData> .Empty;
_lazyDefaultValue = ConstantValue.NotAvailable;
_lazyIsParams = ThreeState.False;
}
else
{
try
{
moduleSymbol.Module.GetParamPropsOrThrow(handle, out _name, out _flags);
}
catch (BadImageFormatException)
{
isBad = true;
}
if (isByRef)
{
ParameterAttributes inOutFlags = _flags & (ParameterAttributes.Out | ParameterAttributes.In);
if (inOutFlags == ParameterAttributes.Out)
{
refKind = RefKind.Out;
}
else if (moduleSymbol.Module.HasIsReadOnlyAttribute(handle))
{
refKind = RefKind.In;
}
else
{
refKind = RefKind.Ref;
}
}
// CONSIDER: Can we make parameter type computation lazy?
type = DynamicTypeDecoder.TransformType(type, countOfCustomModifiers, handle, moduleSymbol, refKind);
_type = TupleTypeDecoder.DecodeTupleTypesIfApplicable(type, handle, moduleSymbol);
}
bool hasNameInMetadata = !string.IsNullOrEmpty(_name);
if (!hasNameInMetadata)
{
// As was done historically, if the parameter doesn't have a name, we give it the name "value".
_name = "value";
}
_packedFlags = new PackedFlags(refKind, attributesAreComplete: handle.IsNil, hasNameInMetadata: hasNameInMetadata);
Debug.Assert(refKind == this.RefKind);
Debug.Assert(hasNameInMetadata == this.HasNameInMetadata);
}
public TupleVirtualElementFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, string name, int tupleElementOrdinal, Location location)
: base(container, underlyingField, tupleElementOrdinal, location)
{
Debug.Assert(name != null);
Debug.Assert(name != underlyingField.Name || !container.UnderlyingNamedType.Equals(underlyingField.ContainingType, TypeCompareKind.IgnoreDynamicAndTupleNames),
"fields that map directly to underlying should not be represented by " + nameof(TupleVirtualElementFieldSymbol));
_name = name;
}
public TupleVirtualElementFieldSymbol(
TupleTypeSymbol container,
FieldSymbol underlyingField,
string name,
int tupleElementIndex,
Location location,
bool isImplicitlyDeclared,
TupleElementFieldSymbol correspondingDefaultFieldOpt)
: base(container, underlyingField, tupleElementIndex, location, isImplicitlyDeclared, correspondingDefaultFieldOpt)
{
Debug.Assert(name != null);
Debug.Assert(name != underlyingField.Name || !container.UnderlyingNamedType.Equals(underlyingField.ContainingType, TypeCompareKind.IgnoreDynamicAndTupleNames),
"fields that map directly to underlying should not be represented by " + nameof(TupleVirtualElementFieldSymbol));
_name = name;
}
public TupleElementFieldSymbol(
TupleTypeSymbol container,
FieldSymbol underlyingField,
int tupleElementIndex,
Location location,
bool isImplicitlyDeclared,
TupleElementFieldSymbol correspondingDefaultFieldOpt)
: base(container, underlyingField, (object)correspondingDefaultFieldOpt == null ? tupleElementIndex << 1 : (tupleElementIndex << 1) + 1)
{
_locations = location == null ? ImmutableArray<Location>.Empty : ImmutableArray.Create(location);
_isImplicitlyDeclared = isImplicitlyDeclared;
Debug.Assert((correspondingDefaultFieldOpt == null) == this.IsDefaultTupleElement);
Debug.Assert(correspondingDefaultFieldOpt == null || correspondingDefaultFieldOpt.IsDefaultTupleElement);
_correspondingDefaultField = correspondingDefaultFieldOpt ?? this;
}
public TupleElementFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleElementIndex, Location location, bool isImplicitlyDeclared)
: base(container, underlyingField, tupleElementIndex)
{
_locations = location == null ? ImmutableArray <Location> .Empty : ImmutableArray.Create(location);
_isImplicitlyDeclared = isImplicitlyDeclared;
}
public TupleEventSymbol(TupleTypeSymbol container, EventSymbol underlyingEvent)
: base(underlyingEvent)
{
_containingType = container;
}
public TupleElementFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleFieldId, Location location)
: base(container, underlyingField, tupleFieldId)
{
_locations = location == null ? ImmutableArray <Location> .Empty : ImmutableArray.Create(location);
}
/// <summary>
/// For cases where the RHS of a deconstruction-declaration is a tuple literal, we merge type information from both the LHS and RHS.
/// For cases where the RHS of a deconstruction-assignment is a tuple literal, the type information from the LHS determines the merged type, since all variables have a type.
/// Returns null if a merged tuple type could not be fabricated.
/// </summary>
private static TypeSymbol MakeMergedTupleType(ArrayBuilder <DeconstructionVariable> lhsVariables, BoundTupleLiteral rhsLiteral, CSharpSyntaxNode syntax, CSharpCompilation compilation, DiagnosticBag diagnostics)
{
int leftLength = lhsVariables.Count;
int rightLength = rhsLiteral.Arguments.Length;
var typesBuilder = ArrayBuilder <TypeSymbol> .GetInstance(leftLength);
var locationsBuilder = ArrayBuilder <Location> .GetInstance(leftLength);
for (int i = 0; i < rightLength; i++)
{
BoundExpression element = rhsLiteral.Arguments[i];
TypeSymbol mergedType = element.Type;
if (i < leftLength)
{
var variable = lhsVariables[i];
if (variable.HasNestedVariables)
{
if (element.Kind == BoundKind.TupleLiteral)
{
// (variables) on the left and (elements) on the right
mergedType = MakeMergedTupleType(variable.NestedVariables, (BoundTupleLiteral)element, syntax, compilation, diagnostics);
}
else if ((object)mergedType == null)
{
// (variables) on the left and null on the right
Error(diagnostics, ErrorCode.ERR_DeconstructRequiresExpression, element.Syntax);
}
}
else
{
if ((object)variable.Single.Type != null)
{
// typed-variable on the left
mergedType = variable.Single.Type;
}
}
}
else
{
if ((object)mergedType == null)
{
// a typeless element on the right, matching no variable on the left
Error(diagnostics, ErrorCode.ERR_DeconstructRequiresExpression, element.Syntax);
}
}
typesBuilder.Add(mergedType);
locationsBuilder.Add(element.Syntax.Location);
}
if (typesBuilder.Any(t => t == null))
{
typesBuilder.Free();
locationsBuilder.Free();
return(null);
}
// The tuple created here is not identical to the one created by
// DeconstructionVariablesAsTuple. It represents a smaller
// tree of types used for figuring out natural types in tuple literal.
return(TupleTypeSymbol.Create(
locationOpt: null,
elementTypes: typesBuilder.ToImmutableAndFree(),
elementLocations: locationsBuilder.ToImmutableAndFree(),
elementNames: default(ImmutableArray <string>),
compilation: compilation,
diagnostics: diagnostics,
shouldCheckConstraints: true,
errorPositions: default(ImmutableArray <bool>),
syntax: syntax));
}
public TupleFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleFieldId)
: base(underlyingField)
{
_containingTuple = container;
_tupleFieldId = tupleFieldId;
}
/// <summary>
/// Converts the expression for creating a tuple instance into an expression creating a ValueTuple (if short) or nested ValueTuples (if longer).
///
/// For instance, for a long tuple we'll generate:
/// creationExpression(ctor=largestCtor, args=firstArgs+(nested creationExpression for remainder, with smaller ctor and next few args))
/// </summary>
private BoundNode RewriteTupleCreationExpression(BoundTupleExpression node, ImmutableArray <BoundExpression> rewrittenArguments)
{
NamedTypeSymbol underlyingTupleType = node.Type.TupleUnderlyingType;
ArrayBuilder <NamedTypeSymbol> underlyingTupleTypeChain = ArrayBuilder <NamedTypeSymbol> .GetInstance();
TupleTypeSymbol.GetUnderlyingTypeChain(underlyingTupleType, underlyingTupleTypeChain);
try
{
// make a creation expression for the smallest type
NamedTypeSymbol smallestType = underlyingTupleTypeChain.Pop();
ImmutableArray <BoundExpression> smallestCtorArguments = ImmutableArray.Create(rewrittenArguments,
underlyingTupleTypeChain.Count * (TupleTypeSymbol.RestPosition - 1),
smallestType.Arity);
var smallestCtor = (MethodSymbol)TupleTypeSymbol.GetWellKnownMemberInType(smallestType.OriginalDefinition,
TupleTypeSymbol.GetTupleCtor(smallestType.Arity),
_diagnostics,
node.Syntax);
if ((object)smallestCtor == null)
{
return(node);
}
MethodSymbol smallestConstructor = smallestCtor.AsMember(smallestType);
BoundObjectCreationExpression currentCreation = new BoundObjectCreationExpression(node.Syntax, smallestConstructor, smallestCtorArguments);
if (underlyingTupleTypeChain.Count > 0)
{
NamedTypeSymbol tuple8Type = underlyingTupleTypeChain.Peek();
var tuple8Ctor = (MethodSymbol)TupleTypeSymbol.GetWellKnownMemberInType(tuple8Type.OriginalDefinition,
TupleTypeSymbol.GetTupleCtor(TupleTypeSymbol.RestPosition),
_diagnostics,
node.Syntax);
if ((object)tuple8Ctor == null)
{
return(node);
}
// make successively larger creation expressions containing the previous one
do
{
ImmutableArray <BoundExpression> ctorArguments = ImmutableArray.Create(rewrittenArguments,
(underlyingTupleTypeChain.Count - 1) * (TupleTypeSymbol.RestPosition - 1),
TupleTypeSymbol.RestPosition - 1)
.Add(currentCreation);
MethodSymbol constructor = tuple8Ctor.AsMember(underlyingTupleTypeChain.Pop());
currentCreation = new BoundObjectCreationExpression(node.Syntax, constructor, ctorArguments);
}while (underlyingTupleTypeChain.Count > 0);
}
return(currentCreation);
}
finally
{
underlyingTupleTypeChain.Free();
}
}
private BoundTupleLiteral DeconstructionVariablesAsTuple(CSharpSyntaxNode syntax, ArrayBuilder <DeconstructionVariable> variables,
DiagnosticBag diagnostics, bool ignoreDiagnosticsFromTuple)
{
int count = variables.Count;
var valuesBuilder = ArrayBuilder <BoundExpression> .GetInstance(count);
var typesBuilder = ArrayBuilder <TypeSymbolWithAnnotations> .GetInstance(count);
var locationsBuilder = ArrayBuilder <Location> .GetInstance(count);
var namesBuilder = ArrayBuilder <string> .GetInstance(count);
foreach (var variable in variables)
{
BoundExpression value;
if (variable.HasNestedVariables)
{
value = DeconstructionVariablesAsTuple(variable.Syntax, variable.NestedVariables, diagnostics, ignoreDiagnosticsFromTuple);
namesBuilder.Add(null);
}
else
{
value = variable.Single;
namesBuilder.Add(ExtractDeconstructResultElementName(value));
}
valuesBuilder.Add(value);
typesBuilder.Add(value.GetTypeAndNullability());
locationsBuilder.Add(variable.Syntax.Location);
}
ImmutableArray <BoundExpression> arguments = valuesBuilder.ToImmutableAndFree();
var uniqueFieldNames = PooledHashSet <string> .GetInstance();
RemoveDuplicateInferredTupleNamesAndFreeIfEmptied(ref namesBuilder, uniqueFieldNames);
uniqueFieldNames.Free();
ImmutableArray <string> tupleNames = namesBuilder is null ? default : namesBuilder.ToImmutableAndFree();
ImmutableArray <bool> inferredPositions = tupleNames.IsDefault ? default : tupleNames.SelectAsArray(n => n != null);
bool disallowInferredNames = this.Compilation.LanguageVersion.DisallowInferredTupleElementNames();
var type = TupleTypeSymbol.Create(
syntax.Location,
typesBuilder.ToImmutableAndFree(), locationsBuilder.ToImmutableAndFree(),
tupleNames, this.Compilation,
shouldCheckConstraints: !ignoreDiagnosticsFromTuple,
includeNullability: false,
errorPositions: disallowInferredNames ? inferredPositions : default,
internal PEPropertySymbol(
PEModuleSymbol moduleSymbol,
PENamedTypeSymbol containingType,
PropertyDefinitionHandle handle,
PEMethodSymbol getMethod,
PEMethodSymbol setMethod)
{
Debug.Assert((object)moduleSymbol != null);
Debug.Assert((object)containingType != null);
Debug.Assert(!handle.IsNil);
_containingType = containingType;
var module = moduleSymbol.Module;
PropertyAttributes mdFlags = 0;
BadImageFormatException mrEx = null;
try
{
module.GetPropertyDefPropsOrThrow(handle, out _name, out mdFlags);
}
catch (BadImageFormatException e)
{
mrEx = e;
if ((object)_name == null)
{
_name = string.Empty;
}
}
_getMethod = getMethod;
_setMethod = setMethod;
_handle = handle;
var metadataDecoder = new MetadataDecoder(moduleSymbol, containingType);
SignatureHeader callingConvention;
BadImageFormatException propEx;
var propertyParams = metadataDecoder.GetSignatureForProperty(handle, out callingConvention, out propEx, allowByRefReturn: true);
Debug.Assert(propertyParams.Length > 0);
SignatureHeader unusedCallingConvention;
BadImageFormatException getEx = null;
var getMethodParams = (object)getMethod == null ? null : metadataDecoder.GetSignatureForMethod(getMethod.Handle, out unusedCallingConvention, out getEx, allowByRefReturn: true);
BadImageFormatException setEx = null;
var setMethodParams = (object)setMethod == null ? null : metadataDecoder.GetSignatureForMethod(setMethod.Handle, out unusedCallingConvention, out setEx, allowByRefReturn: false);
// NOTE: property parameter names are not recorded in metadata, so we have to
// use the parameter names from one of the indexers
// NB: prefer setter names to getter names if both are present.
bool isBad;
_parameters = GetParameters(moduleSymbol, this, propertyParams, setMethodParams ?? getMethodParams, out isBad);
if (propEx != null || getEx != null || setEx != null || mrEx != null || isBad)
{
_lazyUseSiteDiagnostic = new CSDiagnosticInfo(ErrorCode.ERR_BindToBogus, this);
}
_typeCustomModifiers = CSharpCustomModifier.Convert(propertyParams[0].CustomModifiers);
_refKind = propertyParams[0].IsByRef ? RefKind.Ref : RefKind.None;
// CONSIDER: Can we make parameter type computation lazy?
TypeSymbol originalPropertyType = propertyParams[0].Type;
_propertyType = DynamicTypeDecoder.TransformType(originalPropertyType, _typeCustomModifiers.Length, handle, moduleSymbol);
// Dynamify object type if necessary
_propertyType = _propertyType.AsDynamicIfNoPia(_containingType);
_propertyType = TupleTypeSymbol.TransformToTupleIfCompatible(_propertyType); // temporary shallow unification
// A property is bogus and must be accessed by calling its accessors directly if the
// accessor signatures do not agree, both with each other and with the property,
// or if it has parameters and is not an indexer or indexed property.
bool callMethodsDirectly = !DoSignaturesMatch(module, metadataDecoder, propertyParams, _getMethod, getMethodParams, _setMethod, setMethodParams) ||
MustCallMethodsDirectlyCore();
if (!callMethodsDirectly)
{
if ((object)_getMethod != null)
{
_getMethod.SetAssociatedProperty(this, MethodKind.PropertyGet);
}
if ((object)_setMethod != null)
{
_setMethod.SetAssociatedProperty(this, MethodKind.PropertySet);
}
}
if (callMethodsDirectly)
{
_flags |= Flags.CallMethodsDirectly;
}
if ((mdFlags & PropertyAttributes.SpecialName) != 0)
{
_flags |= Flags.IsSpecialName;
}
if ((mdFlags & PropertyAttributes.RTSpecialName) != 0)
{
_flags |= Flags.IsRuntimeSpecialName;
}
}
public override Symbol VisitNamedType(NamedTypeSymbol sourceType)
{
var originalDef = sourceType.OriginalDefinition;
if ((object)originalDef != (object)sourceType)
{
HashSet <DiagnosticInfo> useSiteDiagnostics = null;
var typeArguments = sourceType.GetAllTypeArguments(ref useSiteDiagnostics);
var otherDef = (NamedTypeSymbol)this.Visit(originalDef);
if ((object)otherDef == null)
{
return(null);
}
var otherTypeParameters = otherDef.GetAllTypeParameters();
bool translationFailed = false;
var otherTypeArguments = typeArguments.SelectAsArray((t, v) =>
{
var newType = (TypeSymbol)v.Visit(t.Type);
if ((object)newType == null)
{
// For a newly added type, there is no match in the previous generation, so it could be null.
translationFailed = true;
newType = t.Type;
}
return(new TypeWithModifiers(newType, v.VisitCustomModifiers(t.CustomModifiers)));
}, this);
if (translationFailed)
{
// For a newly added type, there is no match in the previous generation, so it could be null.
return(null);
}
// TODO: LambdaFrame has alpha renamed type parameters, should we rather fix that?
var typeMap = new TypeMap(otherTypeParameters, otherTypeArguments, allowAlpha: true);
return(typeMap.SubstituteNamedType(otherDef));
}
else if (sourceType.IsTupleType)
{
var otherDef = (NamedTypeSymbol)this.Visit(sourceType.TupleUnderlyingType);
if ((object)otherDef == null || !otherDef.IsTupleOrCompatibleWithTupleOfCardinality(sourceType.TupleElementTypes.Length))
{
return(null);
}
return(TupleTypeSymbol.Create(otherDef, sourceType.TupleElementNames));
}
Debug.Assert(sourceType.IsDefinition);
var otherContainer = this.Visit(sourceType.ContainingSymbol);
// Containing type will be missing from other assembly
// if the type was added in the (newer) source assembly.
if ((object)otherContainer == null)
{
return(null);
}
switch (otherContainer.Kind)
{
case SymbolKind.Namespace:
if (AnonymousTypeManager.IsAnonymousTypeTemplate(sourceType))
{
Debug.Assert((object)otherContainer == (object)_otherAssembly.GlobalNamespace);
AnonymousTypeValue value;
this.TryFindAnonymousType(sourceType, out value);
return((NamedTypeSymbol)value.Type);
}
else if (sourceType.IsAnonymousType)
{
return(this.Visit(AnonymousTypeManager.TranslateAnonymousTypeSymbol(sourceType)));
}
else
{
return(FindMatchingNamespaceMember((NamespaceSymbol)otherContainer, sourceType, AreNamedTypesEqual));
}
case SymbolKind.NamedType:
return(FindMatchingNamedTypeMember((NamedTypeSymbol)otherContainer, sourceType, AreNamedTypesEqual));
default:
throw ExceptionUtilities.UnexpectedValue(otherContainer.Kind);
}
}
private NamedTypeSymbol DecodeNamedType(NamedTypeSymbol type)
{
// First decode the type arguments
var typeArgs = type.TypeArgumentsNoUseSiteDiagnostics;
var decodedArgs = DecodeTypeArguments(typeArgs);
NamedTypeSymbol decodedType = type;
// Now check the container
NamedTypeSymbol containingType = type.ContainingType;
NamedTypeSymbol decodedContainingType;
if ((object)containingType != null && containingType.IsGenericType)
{
decodedContainingType = DecodeNamedType(containingType);
Debug.Assert(decodedContainingType.IsGenericType);
}
else
{
decodedContainingType = containingType;
}
// Replace the type if necessary
var containerChanged = !ReferenceEquals(decodedContainingType, containingType);
var typeArgsChanged = typeArgs != decodedArgs;
if (typeArgsChanged || containerChanged)
{
var newTypeArgs = type.HasTypeArgumentsCustomModifiers
? decodedArgs.ZipAsArray(type.TypeArgumentsCustomModifiers, (t, m) => new TypeWithModifiers(t, m))
: decodedArgs.SelectAsArray(TypeMap.TypeSymbolAsTypeWithModifiers);
if (containerChanged)
{
decodedType = decodedType.OriginalDefinition.AsMember(decodedContainingType);
// If the type is nested, e.g. Outer<T>.Inner<V>, then Inner is definitely
// not a tuple, since we know all tuple-compatible types (System.ValueTuple)
// are not nested types. Thus, it is safe to return without checking if
// Inner is a tuple.
return(decodedType.ConstructIfGeneric(newTypeArgs));
}
decodedType = type.ConstructedFrom.Construct(newTypeArgs, unbound: false);
}
// Now decode into a tuple, if it is one
int tupleCardinality;
if (decodedType.IsTupleCompatible(out tupleCardinality))
{
var elementNames = EatElementNamesIfAvailable(tupleCardinality);
Debug.Assert(elementNames.IsDefault || elementNames.Length == tupleCardinality);
decodedType = elementNames.IsDefault
? TupleTypeSymbol.Create(decodedType)
: TupleTypeSymbol.Create(decodedType, elementNames);
}
return(decodedType);
}
public TuplePropertySymbol(TupleTypeSymbol container, PropertySymbol underlyingProperty)
: base(underlyingProperty)
{
_containingType = container;
}
private PEParameterSymbol(
PEModuleSymbol moduleSymbol,
Symbol containingSymbol,
int ordinal,
bool isByRef,
TypeWithAnnotations typeWithAnnotations,
ParameterHandle handle,
Symbol nullableContext,
int countOfCustomModifiers,
out bool isBad)
{
Debug.Assert((object)moduleSymbol != null);
Debug.Assert((object)containingSymbol != null);
Debug.Assert(ordinal >= 0);
Debug.Assert(typeWithAnnotations.HasType);
isBad = false;
_moduleSymbol = moduleSymbol;
_containingSymbol = containingSymbol;
_ordinal = (ushort)ordinal;
_handle = handle;
RefKind refKind = RefKind.None;
if (handle.IsNil)
{
refKind = isByRef ? RefKind.Ref : RefKind.None;
typeWithAnnotations = TupleTypeSymbol.TryTransformToTuple(typeWithAnnotations.Type, out TupleTypeSymbol tuple) ?
TypeWithAnnotations.Create(tuple) :
typeWithAnnotations;
byte?value = nullableContext.GetNullableContextValue();
if (value.HasValue)
{
typeWithAnnotations = NullableTypeDecoder.TransformType(typeWithAnnotations, value.GetValueOrDefault(), default);
}
_lazyCustomAttributes = ImmutableArray <CSharpAttributeData> .Empty;
_lazyHiddenAttributes = ImmutableArray <CSharpAttributeData> .Empty;
_lazyDefaultValue = ConstantValue.NotAvailable;
_lazyIsParams = ThreeState.False;
}
else
{
try
{
moduleSymbol.Module.GetParamPropsOrThrow(handle, out _name, out _flags);
}
catch (BadImageFormatException)
{
isBad = true;
}
if (isByRef)
{
ParameterAttributes inOutFlags = _flags & (ParameterAttributes.Out | ParameterAttributes.In);
if (inOutFlags == ParameterAttributes.Out)
{
refKind = RefKind.Out;
}
else if (moduleSymbol.Module.HasIsReadOnlyAttribute(handle))
{
refKind = RefKind.In;
}
else
{
refKind = RefKind.Ref;
}
}
var typeSymbol = DynamicTypeDecoder.TransformType(typeWithAnnotations.Type, countOfCustomModifiers, handle, moduleSymbol, refKind);
typeWithAnnotations = typeWithAnnotations.WithTypeAndModifiers(typeSymbol, typeWithAnnotations.CustomModifiers);
// Decode nullable before tuple types to avoid converting between
// NamedTypeSymbol and TupleTypeSymbol unnecessarily.
// The containing type is passed to NullableTypeDecoder.TransformType to determine access
// for property parameters because the property does not have explicit accessibility in metadata.
var accessSymbol = containingSymbol.Kind == SymbolKind.Property ? containingSymbol.ContainingSymbol : containingSymbol;
typeWithAnnotations = NullableTypeDecoder.TransformType(typeWithAnnotations, handle, moduleSymbol, accessSymbol: accessSymbol, nullableContext: nullableContext);
typeWithAnnotations = TupleTypeDecoder.DecodeTupleTypesIfApplicable(typeWithAnnotations, handle, moduleSymbol);
}
_typeWithAnnotations = typeWithAnnotations;
bool hasNameInMetadata = !string.IsNullOrEmpty(_name);
if (!hasNameInMetadata)
{
// As was done historically, if the parameter doesn't have a name, we give it the name "value".
_name = "value";
}
_packedFlags = new PackedFlags(refKind, attributesAreComplete: handle.IsNil, hasNameInMetadata: hasNameInMetadata);
Debug.Assert(refKind == this.RefKind);
Debug.Assert(hasNameInMetadata == this.HasNameInMetadata);
}
/// <summary>
/// Checks whether the element name is reserved.
///
/// For example:
/// "Item3" is reserved (at certain positions).
/// "Rest", "ToString" and other members of System.ValueTuple are reserved (in any position).
/// Names that are not reserved return false.
/// </summary>
public static bool IsReservedTupleElementName(string elementName)
{
return(TupleTypeSymbol.IsElementNameReserved(elementName) != -1);
}
public TupleElementFieldSymbol(TupleTypeSymbol container, FieldSymbol underlyingField, int tupleElementIndex, Location location, bool isImplicitlyDeclared)
: base(container, underlyingField, tupleElementIndex)
{
_locations = location == null ? ImmutableArray<Location>.Empty : ImmutableArray.Create(location);
_isImplicitlyDeclared = isImplicitlyDeclared;
}