/NRefactory/ICSharpCode.NRefactory.CSharp/Parser/mcs/ecore.cs
C# | 7426 lines | 5229 code | 1239 blank | 958 comment | 1580 complexity | 88c35216da27541d98926645c583efa9 MD5 | raw file
Possible License(s): LGPL-2.1, MIT, CC-BY-SA-3.0
- //
- // ecore.cs: Core of the Expression representation for the intermediate tree.
- //
- // Author:
- // Miguel de Icaza (miguel@ximian.com)
- // Marek Safar (marek.safar@gmail.com)
- //
- // Copyright 2001, 2002, 2003 Ximian, Inc.
- // Copyright 2003-2008 Novell, Inc.
- // Copyright 2011-2012 Xamarin Inc.
- //
- //
- using System;
- using System.Collections.Generic;
- using System.Text;
- using SLE = System.Linq.Expressions;
- using System.Linq;
- #if STATIC
- using IKVM.Reflection;
- using IKVM.Reflection.Emit;
- #else
- using System.Reflection;
- using System.Reflection.Emit;
- #endif
- namespace Mono.CSharp {
- /// <remarks>
- /// The ExprClass class contains the is used to pass the
- /// classification of an expression (value, variable, namespace,
- /// type, method group, property access, event access, indexer access,
- /// nothing).
- /// </remarks>
- public enum ExprClass : byte {
- Unresolved = 0,
-
- Value,
- Variable,
- Namespace,
- Type,
- TypeParameter,
- MethodGroup,
- PropertyAccess,
- EventAccess,
- IndexerAccess,
- Nothing,
- }
- /// <remarks>
- /// This is used to tell Resolve in which types of expressions we're
- /// interested.
- /// </remarks>
- [Flags]
- public enum ResolveFlags {
- // Returns Value, Variable, PropertyAccess, EventAccess or IndexerAccess.
- VariableOrValue = 1,
- // Returns a type expression.
- Type = 1 << 1,
- // Returns a method group.
- MethodGroup = 1 << 2,
- TypeParameter = 1 << 3,
- // Mask of all the expression class flags.
- MaskExprClass = VariableOrValue | Type | MethodGroup | TypeParameter,
- }
- //
- // This is just as a hint to AddressOf of what will be done with the
- // address.
- [Flags]
- public enum AddressOp {
- Store = 1,
- Load = 2,
- LoadStore = 3
- };
-
- /// <summary>
- /// This interface is implemented by variables
- /// </summary>
- public interface IMemoryLocation {
- /// <summary>
- /// The AddressOf method should generate code that loads
- /// the address of the object and leaves it on the stack.
- ///
- /// The `mode' argument is used to notify the expression
- /// of whether this will be used to read from the address or
- /// write to the address.
- ///
- /// This is just a hint that can be used to provide good error
- /// reporting, and should have no other side effects.
- /// </summary>
- void AddressOf (EmitContext ec, AddressOp mode);
- }
- //
- // An expressions resolved as a direct variable reference
- //
- public interface IVariableReference : IFixedExpression
- {
- bool IsHoisted { get; }
- string Name { get; }
- VariableInfo VariableInfo { get; }
- void SetHasAddressTaken ();
- }
- //
- // Implemented by an expression which could be or is always
- // fixed
- //
- public interface IFixedExpression
- {
- bool IsFixed { get; }
- }
- public interface IExpressionCleanup
- {
- void EmitCleanup (EmitContext ec);
- }
- /// <remarks>
- /// Base class for expressions
- /// </remarks>
- public abstract class Expression {
- public ExprClass eclass;
- protected TypeSpec type;
- protected Location loc;
-
- public TypeSpec Type {
- get { return type; }
- set { type = value; }
- }
- public virtual bool IsSideEffectFree {
- get {
- return false;
- }
- }
- public Location Location {
- get { return loc; }
- }
- public virtual bool IsNull {
- get {
- return false;
- }
- }
- //
- // Used to workaround parser limitation where we cannot get
- // start of statement expression location
- //
- public virtual Location StartLocation {
- get {
- return loc;
- }
- }
- public virtual MethodGroupExpr CanReduceLambda (AnonymousMethodBody body)
- {
- //
- // Return method-group expression when the expression can be used as
- // lambda replacement. A good example is array sorting where instead of
- // code like
- //
- // Array.Sort (s, (a, b) => String.Compare (a, b));
- //
- // we can use method group directly
- //
- // Array.Sort (s, String.Compare);
- //
- // Correct overload will be used because we do the reduction after
- // best candidate was found.
- //
- return null;
- }
- //
- // Returns true when the expression during Emit phase breaks stack
- // by using await expression
- //
- public virtual bool ContainsEmitWithAwait ()
- {
- return false;
- }
- /// <summary>
- /// Performs semantic analysis on the Expression
- /// </summary>
- ///
- /// <remarks>
- /// The Resolve method is invoked to perform the semantic analysis
- /// on the node.
- ///
- /// The return value is an expression (it can be the
- /// same expression in some cases) or a new
- /// expression that better represents this node.
- ///
- /// For example, optimizations of Unary (LiteralInt)
- /// would return a new LiteralInt with a negated
- /// value.
- ///
- /// If there is an error during semantic analysis,
- /// then an error should be reported (using Report)
- /// and a null value should be returned.
- ///
- /// There are two side effects expected from calling
- /// Resolve(): the the field variable "eclass" should
- /// be set to any value of the enumeration
- /// `ExprClass' and the type variable should be set
- /// to a valid type (this is the type of the
- /// expression).
- /// </remarks>
- protected abstract Expression DoResolve (ResolveContext rc);
- public virtual Expression DoResolveLValue (ResolveContext rc, Expression right_side)
- {
- return null;
- }
- //
- // This is used if the expression should be resolved as a type or namespace name.
- // the default implementation fails.
- //
- public virtual TypeSpec ResolveAsType (IMemberContext mc, bool allowUnboundTypeArguments = false)
- {
- ResolveContext ec = new ResolveContext (mc);
- Expression e = Resolve (ec);
- if (e != null)
- e.Error_UnexpectedKind (ec, ResolveFlags.Type, loc);
- return null;
- }
- public static void ErrorIsInaccesible (IMemberContext rc, string member, Location loc)
- {
- rc.Module.Compiler.Report.Error (122, loc, "`{0}' is inaccessible due to its protection level", member);
- }
- public void Error_ExpressionMustBeConstant (ResolveContext rc, Location loc, string e_name)
- {
- rc.Report.Error (133, loc, "The expression being assigned to `{0}' must be constant", e_name);
- }
- public void Error_ConstantCanBeInitializedWithNullOnly (ResolveContext rc, TypeSpec type, Location loc, string name)
- {
- rc.Report.Error (134, loc, "A constant `{0}' of reference type `{1}' can only be initialized with null",
- name, type.GetSignatureForError ());
- }
- protected virtual void Error_InvalidExpressionStatement (Report report, Location loc)
- {
- report.Error (201, loc, "Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement");
- }
-
- public void Error_InvalidExpressionStatement (BlockContext bc)
- {
- Error_InvalidExpressionStatement (bc.Report, loc);
- }
- public void Error_InvalidExpressionStatement (Report report)
- {
- Error_InvalidExpressionStatement (report, loc);
- }
- public static void Error_VoidInvalidInTheContext (Location loc, Report Report)
- {
- Report.Error (1547, loc, "Keyword `void' cannot be used in this context");
- }
- public virtual void Error_ValueCannotBeConverted (ResolveContext ec, TypeSpec target, bool expl)
- {
- Error_ValueCannotBeConvertedCore (ec, loc, target, expl);
- }
- protected void Error_ValueCannotBeConvertedCore (ResolveContext ec, Location loc, TypeSpec target, bool expl)
- {
- // The error was already reported as CS1660
- if (type == InternalType.AnonymousMethod)
- return;
- if (type == InternalType.ErrorType || target == InternalType.ErrorType)
- return;
- string from_type = type.GetSignatureForError ();
- string to_type = target.GetSignatureForError ();
- if (from_type == to_type) {
- from_type = type.GetSignatureForErrorIncludingAssemblyName ();
- to_type = target.GetSignatureForErrorIncludingAssemblyName ();
- }
- if (expl) {
- ec.Report.Error (30, loc, "Cannot convert type `{0}' to `{1}'",
- from_type, to_type);
- return;
- }
- ec.Report.DisableReporting ();
- bool expl_exists = Convert.ExplicitConversion (ec, this, target, Location.Null) != null;
- ec.Report.EnableReporting ();
- if (expl_exists) {
- ec.Report.Error (266, loc,
- "Cannot implicitly convert type `{0}' to `{1}'. An explicit conversion exists (are you missing a cast?)",
- from_type, to_type);
- } else {
- ec.Report.Error (29, loc, "Cannot implicitly convert type `{0}' to `{1}'",
- from_type, to_type);
- }
- }
- public void Error_TypeArgumentsCannotBeUsed (IMemberContext context, MemberSpec member, Location loc)
- {
- // Better message for possible generic expressions
- if (member != null && (member.Kind & MemberKind.GenericMask) != 0) {
- var report = context.Module.Compiler.Report;
- report.SymbolRelatedToPreviousError (member);
- if (member is TypeSpec)
- member = ((TypeSpec) member).GetDefinition ();
- else
- member = ((MethodSpec) member).GetGenericMethodDefinition ();
- string name = member.Kind == MemberKind.Method ? "method" : "type";
- if (member.IsGeneric) {
- report.Error (305, loc, "Using the generic {0} `{1}' requires `{2}' type argument(s)",
- name, member.GetSignatureForError (), member.Arity.ToString ());
- } else {
- report.Error (308, loc, "The non-generic {0} `{1}' cannot be used with the type arguments",
- name, member.GetSignatureForError ());
- }
- } else {
- Error_TypeArgumentsCannotBeUsed (context, ExprClassName, GetSignatureForError (), loc);
- }
- }
- public static void Error_TypeArgumentsCannotBeUsed (IMemberContext context, string exprType, string name, Location loc)
- {
- context.Module.Compiler.Report.Error (307, loc, "The {0} `{1}' cannot be used with type arguments",
- exprType, name);
- }
- protected virtual void Error_TypeDoesNotContainDefinition (ResolveContext ec, TypeSpec type, string name)
- {
- Error_TypeDoesNotContainDefinition (ec, loc, type, name);
- }
- public static void Error_TypeDoesNotContainDefinition (ResolveContext ec, Location loc, TypeSpec type, string name)
- {
- ec.Report.SymbolRelatedToPreviousError (type);
- ec.Report.Error (117, loc, "`{0}' does not contain a definition for `{1}'",
- type.GetSignatureForError (), name);
- }
- public virtual void Error_ValueAssignment (ResolveContext rc, Expression rhs)
- {
- if (rhs == EmptyExpression.LValueMemberAccess || rhs == EmptyExpression.LValueMemberOutAccess) {
- // Already reported as CS1612
- } else if (rhs == EmptyExpression.OutAccess) {
- rc.Report.Error (1510, loc, "A ref or out argument must be an assignable variable");
- } else {
- rc.Report.Error (131, loc, "The left-hand side of an assignment must be a variable, a property or an indexer");
- }
- }
- protected void Error_VoidPointerOperation (ResolveContext rc)
- {
- rc.Report.Error (242, loc, "The operation in question is undefined on void pointers");
- }
- public static void Warning_UnreachableExpression (ResolveContext rc, Location loc)
- {
- rc.Report.Warning (429, 4, loc, "Unreachable expression code detected");
- }
- public ResolveFlags ExprClassToResolveFlags {
- get {
- switch (eclass) {
- case ExprClass.Type:
- case ExprClass.Namespace:
- return ResolveFlags.Type;
-
- case ExprClass.MethodGroup:
- return ResolveFlags.MethodGroup;
-
- case ExprClass.TypeParameter:
- return ResolveFlags.TypeParameter;
-
- case ExprClass.Value:
- case ExprClass.Variable:
- case ExprClass.PropertyAccess:
- case ExprClass.EventAccess:
- case ExprClass.IndexerAccess:
- return ResolveFlags.VariableOrValue;
-
- default:
- throw new InternalErrorException (loc.ToString () + " " + GetType () + " ExprClass is Invalid after resolve");
- }
- }
- }
- //
- // Implements identical simple name and type-name resolution
- //
- public Expression ProbeIdenticalTypeName (ResolveContext rc, Expression left, SimpleName name)
- {
- var t = left.Type;
- if (t.Kind == MemberKind.InternalCompilerType || t is ElementTypeSpec || t.Arity > 0)
- return left;
- // In a member access of the form E.I, if E is a single identifier, and if the meaning of E as a simple-name is
- // a constant, field, property, local variable, or parameter with the same type as the meaning of E as a type-name
- if (left is MemberExpr || left is VariableReference) {
- var identical_type = rc.LookupNamespaceOrType (name.Name, 0, LookupMode.Probing, loc) as TypeExpr;
- if (identical_type != null && identical_type.Type == left.Type)
- return identical_type;
- }
- return left;
- }
- public virtual string GetSignatureForError ()
- {
- return type.GetDefinition ().GetSignatureForError ();
- }
- public static bool IsNeverNull (Expression expr)
- {
- if (expr is This || expr is New || expr is ArrayCreation || expr is DelegateCreation || expr is ConditionalMemberAccess)
- return true;
- var c = expr as Constant;
- if (c != null)
- return !c.IsNull;
- var tc = expr as TypeCast;
- if (tc != null)
- return IsNeverNull (tc.Child);
- return false;
- }
- protected static bool IsNullPropagatingValid (TypeSpec type)
- {
- switch (type.Kind) {
- case MemberKind.Struct:
- return type.IsNullableType;
- case MemberKind.Enum:
- case MemberKind.Void:
- case MemberKind.PointerType:
- return false;
- case MemberKind.InternalCompilerType:
- return type.BuiltinType == BuiltinTypeSpec.Type.Dynamic;
- default:
- return true;
- }
- }
- public virtual bool HasConditionalAccess ()
- {
- return false;
- }
- protected static TypeSpec LiftMemberType (ResolveContext rc, TypeSpec type)
- {
- return TypeSpec.IsValueType (type) && !type.IsNullableType ?
- Nullable.NullableInfo.MakeType (rc.Module, type) :
- type;
- }
-
- /// <summary>
- /// Resolves an expression and performs semantic analysis on it.
- /// </summary>
- ///
- /// <remarks>
- /// Currently Resolve wraps DoResolve to perform sanity
- /// checking and assertion checking on what we expect from Resolve.
- /// </remarks>
- public Expression Resolve (ResolveContext ec, ResolveFlags flags)
- {
- if (eclass != ExprClass.Unresolved) {
- if ((flags & ExprClassToResolveFlags) == 0) {
- Error_UnexpectedKind (ec, flags, loc);
- return null;
- }
- return this;
- }
-
- Expression e;
- try {
- e = DoResolve (ec);
- if (e == null)
- return null;
- if ((flags & e.ExprClassToResolveFlags) == 0) {
- e.Error_UnexpectedKind (ec, flags, loc);
- return null;
- }
- if (e.type == null)
- throw new InternalErrorException ("Expression `{0}' didn't set its type in DoResolve", e.GetType ());
- return e;
- } catch (Exception ex) {
- if (loc.IsNull || ec.Module.Compiler.Settings.BreakOnInternalError || ex is CompletionResult || ec.Report.IsDisabled || ex is FatalException ||
- ec.Report.Printer is NullReportPrinter)
- throw;
- ec.Report.Error (584, loc, "Internal compiler error: {0}", ex.Message);
- return ErrorExpression.Instance; // TODO: Add location
- }
- }
- /// <summary>
- /// Resolves an expression and performs semantic analysis on it.
- /// </summary>
- public Expression Resolve (ResolveContext rc)
- {
- return Resolve (rc, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
- }
- /// <summary>
- /// Resolves an expression for LValue assignment
- /// </summary>
- ///
- /// <remarks>
- /// Currently ResolveLValue wraps DoResolveLValue to perform sanity
- /// checking and assertion checking on what we expect from Resolve
- /// </remarks>
- public Expression ResolveLValue (ResolveContext ec, Expression right_side)
- {
- int errors = ec.Report.Errors;
- bool out_access = right_side == EmptyExpression.OutAccess;
- Expression e = DoResolveLValue (ec, right_side);
- if (e != null && out_access && !(e is IMemoryLocation)) {
- // FIXME: There's no problem with correctness, the 'Expr = null' handles that.
- // Enabling this 'throw' will "only" result in deleting useless code elsewhere,
- //throw new InternalErrorException ("ResolveLValue didn't return an IMemoryLocation: " +
- // e.GetType () + " " + e.GetSignatureForError ());
- e = null;
- }
- if (e == null) {
- if (errors == ec.Report.Errors) {
- Error_ValueAssignment (ec, right_side);
- }
- return null;
- }
- if (e.eclass == ExprClass.Unresolved)
- throw new Exception ("Expression " + e + " ExprClass is Invalid after resolve");
- if ((e.type == null) && !(e is GenericTypeExpr))
- throw new Exception ("Expression " + e + " did not set its type after Resolve");
- return e;
- }
- public Constant ResolveLabelConstant (ResolveContext rc)
- {
- var expr = Resolve (rc);
- if (expr == null)
- return null;
- Constant c = expr as Constant;
- if (c == null) {
- if (expr.type != InternalType.ErrorType)
- rc.Report.Error (150, expr.StartLocation, "A constant value is expected");
- return null;
- }
- return c;
- }
- public virtual void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType, TypeSpec parameterType)
- {
- if (Attribute.IsValidArgumentType (parameterType)) {
- rc.Module.Compiler.Report.Error (182, loc,
- "An attribute argument must be a constant expression, typeof expression or array creation expression");
- } else {
- rc.Module.Compiler.Report.Error (181, loc,
- "Attribute constructor parameter has type `{0}', which is not a valid attribute parameter type",
- targetType.GetSignatureForError ());
- }
- }
- /// <summary>
- /// Emits the code for the expression
- /// </summary>
- ///
- /// <remarks>
- /// The Emit method is invoked to generate the code
- /// for the expression.
- /// </remarks>
- public abstract void Emit (EmitContext ec);
- // Emit code to branch to @target if this expression is equivalent to @on_true.
- // The default implementation is to emit the value, and then emit a brtrue or brfalse.
- // Subclasses can provide more efficient implementations, but those MUST be equivalent,
- // including the use of conditional branches. Note also that a branch MUST be emitted
- public virtual void EmitBranchable (EmitContext ec, Label target, bool on_true)
- {
- Emit (ec);
- ec.Emit (on_true ? OpCodes.Brtrue : OpCodes.Brfalse, target);
- }
- // Emit this expression for its side effects, not for its value.
- // The default implementation is to emit the value, and then throw it away.
- // Subclasses can provide more efficient implementations, but those MUST be equivalent
- public virtual void EmitSideEffect (EmitContext ec)
- {
- Emit (ec);
- ec.Emit (OpCodes.Pop);
- }
- //
- // Emits the expression into temporary field variable. The method
- // should be used for await expressions only
- //
- public virtual Expression EmitToField (EmitContext ec)
- {
- //
- // This is the await prepare Emit method. When emitting code like
- // a + b we emit code like
- //
- // a.Emit ()
- // b.Emit ()
- // Opcodes.Add
- //
- // For await a + await b we have to interfere the flow to keep the
- // stack clean because await yields from the expression. The emit
- // then changes to
- //
- // a = a.EmitToField () // a is changed to temporary field access
- // b = b.EmitToField ()
- // a.Emit ()
- // b.Emit ()
- // Opcodes.Add
- //
- //
- // The idea is to emit expression and leave the stack empty with
- // result value still available.
- //
- // Expressions should override this default implementation when
- // optimized version can be provided (e.g. FieldExpr)
- //
- //
- // We can optimize for side-effect free expressions, they can be
- // emitted out of order
- //
- if (IsSideEffectFree)
- return this;
- bool needs_temporary = ContainsEmitWithAwait ();
- if (!needs_temporary)
- ec.EmitThis ();
- // Emit original code
- var field = EmitToFieldSource (ec);
- if (field == null) {
- //
- // Store the result to temporary field when we
- // cannot load `this' directly
- //
- field = ec.GetTemporaryField (type);
- if (needs_temporary) {
- //
- // Create temporary local (we cannot load `this' before Emit)
- //
- var temp = ec.GetTemporaryLocal (type);
- ec.Emit (OpCodes.Stloc, temp);
- ec.EmitThis ();
- ec.Emit (OpCodes.Ldloc, temp);
- field.EmitAssignFromStack (ec);
- ec.FreeTemporaryLocal (temp, type);
- } else {
- field.EmitAssignFromStack (ec);
- }
- }
- return field;
- }
- protected virtual FieldExpr EmitToFieldSource (EmitContext ec)
- {
- //
- // Default implementation calls Emit method
- //
- Emit (ec);
- return null;
- }
- protected static void EmitExpressionsList (EmitContext ec, List<Expression> expressions)
- {
- if (ec.HasSet (BuilderContext.Options.AsyncBody)) {
- bool contains_await = false;
- for (int i = 1; i < expressions.Count; ++i) {
- if (expressions[i].ContainsEmitWithAwait ()) {
- contains_await = true;
- break;
- }
- }
- if (contains_await) {
- for (int i = 0; i < expressions.Count; ++i) {
- expressions[i] = expressions[i].EmitToField (ec);
- }
- }
- }
- for (int i = 0; i < expressions.Count; ++i) {
- expressions[i].Emit (ec);
- }
- }
- /// <summary>
- /// Protected constructor. Only derivate types should
- /// be able to be created
- /// </summary>
- protected Expression ()
- {
- }
- /// <summary>
- /// Returns a fully formed expression after a MemberLookup
- /// </summary>
- ///
- static Expression ExprClassFromMemberInfo (MemberSpec spec, Location loc)
- {
- if (spec is EventSpec)
- return new EventExpr ((EventSpec) spec, loc);
- if (spec is ConstSpec)
- return new ConstantExpr ((ConstSpec) spec, loc);
- if (spec is FieldSpec)
- return new FieldExpr ((FieldSpec) spec, loc);
- if (spec is PropertySpec)
- return new PropertyExpr ((PropertySpec) spec, loc);
- if (spec is TypeSpec)
- return new TypeExpression (((TypeSpec) spec), loc);
- return null;
- }
- public static MethodSpec ConstructorLookup (ResolveContext rc, TypeSpec type, ref Arguments args, Location loc)
- {
- var ctors = MemberCache.FindMembers (type, Constructor.ConstructorName, true);
- if (ctors == null) {
- switch (type.Kind) {
- case MemberKind.Struct:
- rc.Report.SymbolRelatedToPreviousError (type);
- // Report meaningful error for struct as they always have default ctor in C# context
- OverloadResolver.Error_ConstructorMismatch (rc, type, args == null ? 0 : args.Count, loc);
- break;
- case MemberKind.MissingType:
- case MemberKind.InternalCompilerType:
- // LAMESPEC: dynamic is not really object
- // if (type.BuiltinType == BuiltinTypeSpec.Type.Object)
- // goto default;
- break;
- default:
- rc.Report.SymbolRelatedToPreviousError (type);
- rc.Report.Error (143, loc, "The class `{0}' has no constructors defined",
- type.GetSignatureForError ());
- break;
- }
- return null;
- }
- var r = new OverloadResolver (ctors, OverloadResolver.Restrictions.NoBaseMembers, loc);
- if (!rc.HasSet (ResolveContext.Options.BaseInitializer)) {
- r.InstanceQualifier = new ConstructorInstanceQualifier (type);
- }
- return r.ResolveMember<MethodSpec> (rc, ref args);
- }
- [Flags]
- public enum MemberLookupRestrictions
- {
- None = 0,
- InvocableOnly = 1,
- ExactArity = 1 << 2,
- ReadAccess = 1 << 3,
- EmptyArguments = 1 << 4,
- IgnoreArity = 1 << 5,
- IgnoreAmbiguity = 1 << 6
- }
- //
- // Lookup type `queried_type' for code in class `container_type' with a qualifier of
- // `qualifier_type' or null to lookup members in the current class.
- //
- public static Expression MemberLookup (IMemberContext rc, bool errorMode, TypeSpec queried_type, string name, int arity, MemberLookupRestrictions restrictions, Location loc)
- {
- var members = MemberCache.FindMembers (queried_type, name, false);
- if (members == null)
- return null;
- MemberSpec non_method = null;
- MemberSpec ambig_non_method = null;
- do {
- for (int i = 0; i < members.Count; ++i) {
- var member = members[i];
- // HACK: for events because +=/-= can appear at same class only, should use OverrideToBase there
- if ((member.Modifiers & Modifiers.OVERRIDE) != 0 && member.Kind != MemberKind.Event)
- continue;
- if ((member.Modifiers & Modifiers.BACKING_FIELD) != 0 || member.Kind == MemberKind.Operator)
- continue;
- if ((arity > 0 || (restrictions & MemberLookupRestrictions.ExactArity) != 0) && member.Arity != arity)
- continue;
- if (!errorMode) {
- if (!member.IsAccessible (rc))
- continue;
- //
- // With runtime binder we can have a situation where queried type is inaccessible
- // because it came via dynamic object, the check about inconsisted accessibility
- // had no effect as the type was unknown during compilation
- //
- // class A {
- // private class N { }
- //
- // public dynamic Foo ()
- // {
- // return new N ();
- // }
- // }
- //
- if (rc.Module.Compiler.IsRuntimeBinder && !member.DeclaringType.IsAccessible (rc))
- continue;
- }
- if ((restrictions & MemberLookupRestrictions.InvocableOnly) != 0) {
- if (member is MethodSpec) {
- //
- // Interface members that are hidden by class members are removed from the set. This
- // step only has an effect if T is a type parameter and T has both an effective base
- // class other than object and a non-empty effective interface set
- //
- var tps = queried_type as TypeParameterSpec;
- if (tps != null && tps.HasTypeConstraint)
- members = RemoveHiddenTypeParameterMethods (members);
- return new MethodGroupExpr (members, queried_type, loc);
- }
- if (!Invocation.IsMemberInvocable (member))
- continue;
- }
- if (non_method == null || member is MethodSpec || non_method.IsNotCSharpCompatible) {
- non_method = member;
- } else if (!errorMode && !member.IsNotCSharpCompatible) {
- //
- // Interface members that are hidden by class members are removed from the set when T is a type parameter and
- // T has both an effective base class other than object and a non-empty effective interface set.
- //
- // The spec has more complex rules but we simply remove all members declared in an interface declaration.
- //
- var tps = queried_type as TypeParameterSpec;
- if (tps != null && tps.HasTypeConstraint) {
- if (non_method.DeclaringType.IsClass && member.DeclaringType.IsInterface)
- continue;
- if (non_method.DeclaringType.IsInterface && member.DeclaringType.IsInterface) {
- non_method = member;
- continue;
- }
- }
- ambig_non_method = member;
- }
- }
- if (non_method != null) {
- if (ambig_non_method != null && rc != null && (restrictions & MemberLookupRestrictions.IgnoreAmbiguity) == 0) {
- var report = rc.Module.Compiler.Report;
- report.SymbolRelatedToPreviousError (non_method);
- report.SymbolRelatedToPreviousError (ambig_non_method);
- report.Error (229, loc, "Ambiguity between `{0}' and `{1}'",
- non_method.GetSignatureForError (), ambig_non_method.GetSignatureForError ());
- }
- if (non_method is MethodSpec)
- return new MethodGroupExpr (members, queried_type, loc);
- return ExprClassFromMemberInfo (non_method, loc);
- }
- if (members[0].DeclaringType.BaseType == null)
- members = null;
- else
- members = MemberCache.FindMembers (members[0].DeclaringType.BaseType, name, false);
- } while (members != null);
- return null;
- }
- static IList<MemberSpec> RemoveHiddenTypeParameterMethods (IList<MemberSpec> members)
- {
- if (members.Count < 2)
- return members;
- //
- // If M is a method, then all non-method members declared in an interface declaration
- // are removed from the set, and all methods with the same signature as M declared in
- // an interface declaration are removed from the set
- //
- bool copied = false;
- for (int i = 0; i < members.Count; ++i) {
- var method = members[i] as MethodSpec;
- if (method == null) {
- if (!copied) {
- copied = true;
- members = new List<MemberSpec> (members);
- }
-
- members.RemoveAt (i--);
- continue;
- }
- if (!method.DeclaringType.IsInterface)
- continue;
- for (int ii = 0; ii < members.Count; ++ii) {
- var candidate = members[ii] as MethodSpec;
- if (candidate == null || !candidate.DeclaringType.IsClass)
- continue;
- if (!TypeSpecComparer.Override.IsEqual (candidate.Parameters, method.Parameters))
- continue;
- if (!copied) {
- copied = true;
- members = new List<MemberSpec> (members);
- }
- members.RemoveAt (i--);
- break;
- }
- }
- return members;
- }
- protected virtual void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
- {
- throw new NotImplementedException ();
- }
- public virtual void Error_OperatorCannotBeApplied (ResolveContext rc, Location loc, string oper, TypeSpec t)
- {
- if (t == InternalType.ErrorType)
- return;
- rc.Report.Error (23, loc, "The `{0}' operator cannot be applied to operand of type `{1}'",
- oper, t.GetSignatureForError ());
- }
- protected void Error_PointerInsideExpressionTree (ResolveContext ec)
- {
- ec.Report.Error (1944, loc, "An expression tree cannot contain an unsafe pointer operation");
- }
- protected void Error_NullShortCircuitInsideExpressionTree (ResolveContext rc)
- {
- rc.Report.Error (8072, loc, "An expression tree cannot contain a null propagating operator");
- }
- public virtual void FlowAnalysis (FlowAnalysisContext fc)
- {
- }
- //
- // Special version of flow analysis for expressions which can return different
- // on-true and on-false result. Used by &&, ||, ?: expressions
- //
- public virtual void FlowAnalysisConditional (FlowAnalysisContext fc)
- {
- FlowAnalysis (fc);
- fc.DefiniteAssignmentOnTrue = fc.DefiniteAssignmentOnFalse = fc.DefiniteAssignment;
- }
- /// <summary>
- /// Returns an expression that can be used to invoke operator true
- /// on the expression if it exists.
- /// </summary>
- protected static Expression GetOperatorTrue (ResolveContext ec, Expression e, Location loc)
- {
- return GetOperatorTrueOrFalse (ec, e, true, loc);
- }
- /// <summary>
- /// Returns an expression that can be used to invoke operator false
- /// on the expression if it exists.
- /// </summary>
- protected static Expression GetOperatorFalse (ResolveContext ec, Expression e, Location loc)
- {
- return GetOperatorTrueOrFalse (ec, e, false, loc);
- }
- static Expression GetOperatorTrueOrFalse (ResolveContext ec, Expression e, bool is_true, Location loc)
- {
- var op = is_true ? Operator.OpType.True : Operator.OpType.False;
- var methods = MemberCache.GetUserOperator (e.type, op, false);
- if (methods == null)
- return null;
- Arguments arguments = new Arguments (1);
- arguments.Add (new Argument (e));
- var res = new OverloadResolver (methods, OverloadResolver.Restrictions.BaseMembersIncluded | OverloadResolver.Restrictions.NoBaseMembers, loc);
- var oper = res.ResolveOperator (ec, ref arguments);
- if (oper == null)
- return null;
- return new UserOperatorCall (oper, arguments, null, loc);
- }
-
- public virtual string ExprClassName
- {
- get {
- switch (eclass){
- case ExprClass.Unresolved:
- return "Unresolved";
- case ExprClass.Value:
- return "value";
- case ExprClass.Variable:
- return "variable";
- case ExprClass.Namespace:
- return "namespace";
- case ExprClass.Type:
- return "type";
- case ExprClass.MethodGroup:
- return "method group";
- case ExprClass.PropertyAccess:
- return "property access";
- case ExprClass.EventAccess:
- return "event access";
- case ExprClass.IndexerAccess:
- return "indexer access";
- case ExprClass.Nothing:
- return "null";
- case ExprClass.TypeParameter:
- return "type parameter";
- }
- throw new Exception ("Should not happen");
- }
- }
-
- /// <summary>
- /// Reports that we were expecting `expr' to be of class `expected'
- /// </summary>
- public static void Error_UnexpectedKind (IMemberContext ctx, Expression memberExpr, string expected, string was, Location loc)
- {
- var name = memberExpr.GetSignatureForError ();
- ctx.Module.Compiler.Report.Error (118, loc, "`{0}' is a `{1}' but a `{2}' was expected", name, was, expected);
- }
- public virtual void Error_UnexpectedKind (ResolveContext ec, ResolveFlags flags, Location loc)
- {
- string [] valid = new string [4];
- int count = 0;
- if ((flags & ResolveFlags.VariableOrValue) != 0) {
- valid [count++] = "variable";
- valid [count++] = "value";
- }
- if ((flags & ResolveFlags.Type) != 0)
- valid [count++] = "type";
- if ((flags & ResolveFlags.MethodGroup) != 0)
- valid [count++] = "method group";
- if (count == 0)
- valid [count++] = "unknown";
- StringBuilder sb = new StringBuilder (valid [0]);
- for (int i = 1; i < count - 1; i++) {
- sb.Append ("', `");
- sb.Append (valid [i]);
- }
- if (count > 1) {
- sb.Append ("' or `");
- sb.Append (valid [count - 1]);
- }
- ec.Report.Error (119, loc,
- "Expression denotes a `{0}', where a `{1}' was expected", ExprClassName, sb.ToString ());
- }
-
- public static void UnsafeError (ResolveContext ec, Location loc)
- {
- UnsafeError (ec.Report, loc);
- }
- public static void UnsafeError (Report Report, Location loc)
- {
- Report.Error (214, loc, "Pointers and fixed size buffers may only be used in an unsafe context");
- }
- //
- // Converts `source' to an int, uint, long or ulong.
- //
- protected Expression ConvertExpressionToArrayIndex (ResolveContext ec, Expression source, bool pointerArray = false)
- {
- var btypes = ec.BuiltinTypes;
- if (source.type.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
- Arguments args = new Arguments (1);
- args.Add (new Argument (source));
- return new DynamicConversion (btypes.Int, CSharpBinderFlags.ConvertArrayIndex, args, loc).Resolve (ec);
- }
- Expression converted;
-
- using (ec.Set (ResolveContext.Options.CheckedScope)) {
- converted = Convert.ImplicitConversion (ec, source, btypes.Int, source.loc);
- if (converted == null)
- converted = Convert.ImplicitConversion (ec, source, btypes.UInt, source.loc);
- if (converted == null)
- converted = Convert.ImplicitConversion (ec, source, btypes.Long, source.loc);
- if (converted == null)
- converted = Convert.ImplicitConversion (ec, source, btypes.ULong, source.loc);
- if (converted == null) {
- source.Error_ValueCannotBeConverted (ec, btypes.Int, false);
- return null;
- }
- }
- if (pointerArray)
- return converted;
- //
- // Only positive constants are allowed at compile time
- //
- Constant c = converted as Constant;
- if (c != null && c.IsNegative)
- Error_NegativeArrayIndex (ec, source.loc);
- // No conversion needed to array index
- if (converted.Type.BuiltinType == BuiltinTypeSpec.Type.Int)
- return converted;
- return new ArrayIndexCast (converted, btypes.Int).Resolve (ec);
- }
- //
- // Derived classes implement this method by cloning the fields that
- // could become altered during the Resolve stage
- //
- // Only expressions that are created for the parser need to implement
- // this.
- //
- protected virtual void CloneTo (CloneContext clonectx, Expression target)
- {
- throw new NotImplementedException (
- String.Format (
- "CloneTo not implemented for expression {0}", this.GetType ()));
- }
- //
- // Clones an expression created by the parser.
- //
- // We only support expressions created by the parser so far, not
- // expressions that have been resolved (many more classes would need
- // to implement CloneTo).
- //
- // This infrastructure is here merely for Lambda expressions which
- // compile the same code using different type values for the same
- // arguments to find the correct overload
- //
- public virtual Expression Clone (CloneContext clonectx)
- {
- Expression cloned = (Expression) MemberwiseClone ();
- CloneTo (clonectx, cloned);
- return cloned;
- }
- //
- // Implementation of expression to expression tree conversion
- //
- public abstract Expression CreateExpressionTree (ResolveContext ec);
- protected Expression CreateExpressionFactoryCall (ResolveContext ec, string name, Arguments args)
- {
- return CreateExpressionFactoryCall (ec, name, null, args, loc);
- }
- protected Expression CreateExpressionFactoryCall (ResolveContext ec, string name, TypeArguments typeArguments, Arguments args)
- {
- return CreateExpressionFactoryCall (ec, name, typeArguments, args, loc);
- }
- public static Expression CreateExpressionFactoryCall (ResolveContext ec, string name, TypeArguments typeArguments, Arguments args, Location loc)
- {
- return new Invocation (new MemberAccess (CreateExpressionTypeExpression (ec, loc), name, typeArguments, loc), args);
- }
- protected static TypeExpr CreateExpressionTypeExpression (ResolveContext ec, Location loc)
- {
- var t = ec.Module.PredefinedTypes.Expression.Resolve ();
- if (t == null)
- return null;
- return new TypeExpression (t, loc);
- }
- //
- // Implemented by all expressions which support conversion from
- // compiler expression to invokable runtime expression. Used by
- // dynamic C# binder.
- //
- public virtual SLE.Expression MakeExpression (BuilderContext ctx)
- {
- throw new NotImplementedException ("MakeExpression for " + GetType ());
- }
-
- public virtual object Accept (StructuralVisitor visitor)
- {
- return visitor.Visit (this);
- }
- }
- /// <summary>
- /// This is just a base class for expressions that can
- /// appear on statements (invocations, object creation,
- /// assignments, post/pre increment and decrement). The idea
- /// being that they would support an extra Emition interface that
- /// does not leave a result on the stack.
- /// </summary>
- public abstract class ExpressionStatement : Expression
- {
- public virtual void MarkReachable (Reachability rc)
- {
- }
- public ExpressionStatement ResolveStatement (BlockContext ec)
- {
- Expression e = Resolve (ec);
- if (e == null)
- return null;
- ExpressionStatement es = e as ExpressionStatement;
- if (es == null || e is AnonymousMethodBody)
- Error_InvalidExpressionStatement (ec);
- //
- // This is quite expensive warning, try to limit the damage
- //
- if (MemberAccess.IsValidDotExpression (e.Type) && !(e is Assign || e is Await)) {
- WarningAsyncWithoutWait (ec, e);
- }
- return es;
- }
- static void WarningAsyncWithoutWait (BlockContext bc, Expression e)
- {
- if (bc.CurrentAnonymousMethod is AsyncInitializer) {
- var awaiter = new AwaitStatement.AwaitableMemberAccess (e) {
- ProbingMode = true
- };
- //
- // Need to do full resolve because GetAwaiter can be extension method
- // available only in this context
- //
- var mg = awaiter.Resolve (bc) as MethodGroupExpr;
- if (mg == null)
- return;
- var arguments = new Arguments (0);
- mg = mg.OverloadResolve (bc, ref arguments, null, OverloadResolver.Restrictions.ProbingOnly);
- if (mg == null)
- return;
- //
- // Use same check rules as for real await
- //
- var awaiter_definition = bc.Module.GetAwaiter (mg.BestCandidateReturnType);
- if (!awaiter_definition.IsValidPattern || !awaiter_definition.INotifyCompletion)
- return;
- bc.Report.Warning (4014, 1, e.Location,
- "The statement is not awaited and execution of current method continues before the call is completed. Consider using `await' operator");
- return;
- }
- var inv = e as Invocation;
- if (inv != null && inv.MethodGroup != null && inv.MethodGroup.BestCandidate.IsAsync) {
- // The warning won't be reported for imported methods to maintain warning compatiblity with csc
- bc.Report.Warning (4014, 1, e.Location,
- "The statement is not awaited and execution of current method continues before the call is completed. Consider using `await' operator or calling `Wait' method");
- return;
- }
- }
- /// <summary>
- /// Requests the expression to be emitted in a `statement'
- /// context. This means that no new value is left on the
- /// stack after invoking this method (constrasted with
- /// Emit that will always leave a value on the stack).
- /// </summary>
- public abstract void EmitStatement (EmitContext ec);
- public override void EmitSideEffect (EmitContext ec)
- {
- EmitStatement (ec);
- }
- }
- /// <summary>
- /// This kind of cast is used to encapsulate the child
- /// whose type is child.Type into an expression that is
- /// reported to return "return_type". This is used to encapsulate
- /// expressions which have compatible types, but need to be dealt
- /// at higher levels with.
- ///
- /// For example, a "byte" expression could be encapsulated in one
- /// of these as an "unsigned int". The type for the expression
- /// would be "unsigned int".
- ///
- /// </summary>
- public abstract class TypeCast : Expression
- {
- protected readonly Expression child;
- protected TypeCast (Expression child, TypeSpec return_type)
- {
- eclass = child.eclass;
- loc = child.Location;
- type = return_type;
- this.child = child;
- }
- public Expression Child {
- get {
- return child;
- }
- }
- public override bool ContainsEmitWithAwait ()
- {
- return child.ContainsEmitWithAwait ();
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- Arguments args = new Arguments (2);
- args.Add (new Argument (child.CreateExpressionTree (ec)));
- args.Add (new Argument (new TypeOf (type, loc)));
- if (type.IsPointer || child.Type.IsPointer)
- Error_PointerInsideExpressionTree (ec);
- return CreateExpressionFactoryCall (ec, ec.HasSet (ResolveContext.Options.CheckedScope) ? "ConvertChecked" : "Convert", args);
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- // This should never be invoked, we are born in fully
- // initialized state.
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- child.Emit (ec);
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- child.FlowAnalysis (fc);
- }
- public override SLE.Expression MakeExpression (BuilderContext ctx)
- {
- #if STATIC
- return base.MakeExpression (ctx);
- #else
- return ctx.HasSet (BuilderContext.Options.CheckedScope) ?
- SLE.Expression.ConvertChecked (child.MakeExpression (ctx), type.GetMetaInfo ()) :
- SLE.Expression.Convert (child.MakeExpression (ctx), type.GetMetaInfo ());
- #endif
- }
- protected override void CloneTo (CloneContext clonectx, Expression t)
- {
- // Nothing to clone
- }
- public override bool IsNull {
- get { return child.IsNull; }
- }
- }
- public class EmptyCast : TypeCast {
- EmptyCast (Expression child, TypeSpec target_type)
- : base (child, target_type)
- {
- }
- public static Expression Create (Expression child, TypeSpec type)
- {
- Constant c = child as Constant;
- if (c != null) {
- var enum_constant = c as EnumConstant;
- if (enum_constant != null)
- c = enum_constant.Child;
- if (!(c is ReducedExpression.ReducedConstantExpression)) {
- if (c.Type == type)
- return c;
- var res = c.ConvertImplicitly (type);
- if (res != null)
- return res;
- }
- }
- EmptyCast e = child as EmptyCast;
- if (e != null)
- return new EmptyCast (e.child, type);
- return new EmptyCast (child, type);
- }
- public override void EmitBranchable (EmitContext ec, Label label, bool on_true)
- {
- child.EmitBranchable (ec, label, on_true);
- }
- public override void EmitSideEffect (EmitContext ec)
- {
- child.EmitSideEffect (ec);
- }
- }
- //
- // Used for predefined type user operator (no obsolete check, etc.)
- //
- public class OperatorCast : TypeCast
- {
- readonly MethodSpec conversion_operator;
- public OperatorCast (Expression expr, TypeSpec target_type)
- : this (expr, target_type, target_type, false)
- {
- }
-
- public OperatorCast (Expression expr, TypeSpec target_type, bool find_explicit)
- : this (expr, target_type, target_type, find_explicit)
- {
- }
-
- public OperatorCast (Expression expr, TypeSpec declaringType, TypeSpec returnType, bool isExplicit)
- : base (expr, returnType)
- {
- var op = isExplicit ? Operator.OpType.Explicit : Operator.OpType.Implicit;
- var mi = MemberCache.GetUserOperator (declaringType, op, true);
- if (mi != null) {
- foreach (MethodSpec oper in mi) {
- if (oper.ReturnType != returnType)
- continue;
- if (oper.Parameters.Types[0] == expr.Type) {
- conversion_operator = oper;
- return;
- }
- }
- }
- throw new InternalErrorException ("Missing predefined user operator between `{0}' and `{1}'",
- returnType.GetSignatureForError (), expr.Type.GetSignatureForError ());
- }
- public override void Emit (EmitContext ec)
- {
- child.Emit (ec);
- ec.Emit (OpCodes.Call, conversion_operator);
- }
- }
-
- //
- // Constant specialization of EmptyCast.
- // We need to special case this since an empty cast of
- // a constant is still a constant.
- //
- public class EmptyConstantCast : Constant
- {
- public readonly Constant child;
- public EmptyConstantCast (Constant child, TypeSpec type)
- : base (child.Location)
- {
- if (child == null)
- throw new ArgumentNullException ("child");
- this.child = child;
- this.eclass = child.eclass;
- this.type = type;
- }
- public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
- {
- if (child.Type == target_type)
- return child;
- // FIXME: check that 'type' can be converted to 'target_type' first
- return child.ConvertExplicitly (in_checked_context, target_type);
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- Arguments args = Arguments.CreateForExpressionTree (ec, null,
- child.CreateExpressionTree (ec),
- new TypeOf (type, loc));
- if (type.IsPointer)
- Error_PointerInsideExpressionTree (ec);
- return CreateExpressionFactoryCall (ec, "Convert", args);
- }
- public override bool IsDefaultValue {
- get { return child.IsDefaultValue; }
- }
- public override bool IsNegative {
- get { return child.IsNegative; }
- }
- public override bool IsNull {
- get { return child.IsNull; }
- }
-
- public override bool IsOneInteger {
- get { return child.IsOneInteger; }
- }
- public override bool IsSideEffectFree {
- get {
- return child.IsSideEffectFree;
- }
- }
- public override bool IsZeroInteger {
- get { return child.IsZeroInteger; }
- }
- public override void Emit (EmitContext ec)
- {
- child.Emit (ec);
- }
- public override void EmitBranchable (EmitContext ec, Label label, bool on_true)
- {
- child.EmitBranchable (ec, label, on_true);
- // Only to make verifier happy
- if (TypeManager.IsGenericParameter (type) && child.IsNull)
- ec.Emit (OpCodes.Unbox_Any, type);
- }
- public override void EmitSideEffect (EmitContext ec)
- {
- child.EmitSideEffect (ec);
- }
- public override object GetValue ()
- {
- return child.GetValue ();
- }
- public override string GetValueAsLiteral ()
- {
- return child.GetValueAsLiteral ();
- }
- public override long GetValueAsLong ()
- {
- return child.GetValueAsLong ();
- }
- public override Constant ConvertImplicitly (TypeSpec target_type)
- {
- if (type == target_type)
- return this;
- // FIXME: Do we need to check user conversions?
- if (!Convert.ImplicitStandardConversionExists (this, target_type))
- return null;
- return child.ConvertImplicitly (target_type);
- }
- }
- /// <summary>
- /// This class is used to wrap literals which belong inside Enums
- /// </summary>
- public class EnumConstant : Constant
- {
- public Constant Child;
- public EnumConstant (Constant child, TypeSpec enum_type)
- : base (child.Location)
- {
- this.Child = child;
- this.eclass = ExprClass.Value;
- this.type = enum_type;
- }
- protected EnumConstant (Location loc)
- : base (loc)
- {
- }
- public override void Emit (EmitContext ec)
- {
- Child.Emit (ec);
- }
- public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType, TypeSpec parameterType)
- {
- Child.EncodeAttributeValue (rc, enc, Child.Type, parameterType);
- }
- public override void EmitBranchable (EmitContext ec, Label label, bool on_true)
- {
- Child.EmitBranchable (ec, label, on_true);
- }
- public override void EmitSideEffect (EmitContext ec)
- {
- Child.EmitSideEffect (ec);
- }
- public override string GetSignatureForError()
- {
- return Type.GetSignatureForError ();
- }
- public override object GetValue ()
- {
- return Child.GetValue ();
- }
- #if !STATIC
- public override object GetTypedValue ()
- {
- //
- // The method can be used in dynamic context only (on closed types)
- //
- // System.Enum.ToObject cannot be called on dynamic types
- // EnumBuilder has to be used, but we cannot use EnumBuilder
- // because it does not properly support generics
- //
- return System.Enum.ToObject (type.GetMetaInfo (), Child.GetValue ());
- }
- #endif
- public override string GetValueAsLiteral ()
- {
- return Child.GetValueAsLiteral ();
- }
- public override long GetValueAsLong ()
- {
- return Child.GetValueAsLong ();
- }
- public EnumConstant Increment()
- {
- return new EnumConstant (((IntegralConstant) Child).Increment (), type);
- }
- public override bool IsDefaultValue {
- get {
- return Child.IsDefaultValue;
- }
- }
- public override bool IsSideEffectFree {
- get {
- return Child.IsSideEffectFree;
- }
- }
- public override bool IsZeroInteger {
- get { return Child.IsZeroInteger; }
- }
- public override bool IsNegative {
- get {
- return Child.IsNegative;
- }
- }
- public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
- {
- if (Child.Type == target_type)
- return Child;
- return Child.ConvertExplicitly (in_checked_context, target_type);
- }
- public override Constant ConvertImplicitly (TypeSpec type)
- {
- if (this.type == type) {
- return this;
- }
- if (!Convert.ImplicitStandardConversionExists (this, type)){
- return null;
- }
- return Child.ConvertImplicitly (type);
- }
- }
- /// <summary>
- /// This kind of cast is used to encapsulate Value Types in objects.
- ///
- /// The effect of it is to box the value type emitted by the previous
- /// operation.
- /// </summary>
- public class BoxedCast : TypeCast {
- public BoxedCast (Expression expr, TypeSpec target_type)
- : base (expr, target_type)
- {
- eclass = ExprClass.Value;
- }
-
- protected override Expression DoResolve (ResolveContext ec)
- {
- // This should never be invoked, we are born in fully
- // initialized state.
- return this;
- }
- public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType, TypeSpec parameterType)
- {
- // Only boxing to object type is supported
- if (targetType.BuiltinType != BuiltinTypeSpec.Type.Object) {
- base.EncodeAttributeValue (rc, enc, targetType, parameterType);
- return;
- }
- enc.Encode (child.Type);
- child.EncodeAttributeValue (rc, enc, child.Type, parameterType);
- }
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
-
- ec.Emit (OpCodes.Box, child.Type);
- }
- public override void EmitSideEffect (EmitContext ec)
- {
- // boxing is side-effectful, since it involves runtime checks, except when boxing to Object or ValueType
- // so, we need to emit the box+pop instructions in most cases
- if (child.Type.IsStruct &&
- (type.BuiltinType == BuiltinTypeSpec.Type.Object || type.BuiltinType == BuiltinTypeSpec.Type.ValueType))
- child.EmitSideEffect (ec);
- else
- base.EmitSideEffect (ec);
- }
- }
- public class UnboxCast : TypeCast {
- public UnboxCast (Expression expr, TypeSpec return_type)
- : base (expr, return_type)
- {
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- // This should never be invoked, we are born in fully
- // initialized state.
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
- ec.Emit (OpCodes.Unbox_Any, type);
- }
- }
-
- /// <summary>
- /// This is used to perform explicit numeric conversions.
- ///
- /// Explicit numeric conversions might trigger exceptions in a checked
- /// context, so they should generate the conv.ovf opcodes instead of
- /// conv opcodes.
- /// </summary>
- public class ConvCast : TypeCast {
- public enum Mode : byte {
- I1_U1, I1_U2, I1_U4, I1_U8, I1_CH,
- U1_I1, U1_CH,
- I2_I1, I2_U1, I2_U2, I2_U4, I2_U8, I2_CH,
- U2_I1, U2_U1, U2_I2, U2_CH,
- I4_I1, I4_U1, I4_I2, I4_U2, I4_U4, I4_U8, I4_CH,
- U4_I1, U4_U1, U4_I2, U4_U2, U4_I4, U4_CH,
- I8_I1, I8_U1, I8_I2, I8_U2, I8_I4, I8_U4, I8_U8, I8_CH, I8_I,
- U8_I1, U8_U1, U8_I2, U8_U2, U8_I4, U8_U4, U8_I8, U8_CH, U8_I,
- CH_I1, CH_U1, CH_I2,
- R4_I1, R4_U1, R4_I2, R4_U2, R4_I4, R4_U4, R4_I8, R4_U8, R4_CH,
- R8_I1, R8_U1, R8_I2, R8_U2, R8_I4, R8_U4, R8_I8, R8_U8, R8_CH, R8_R4,
- I_I8,
- }
- Mode mode;
-
- public ConvCast (Expression child, TypeSpec return_type, Mode m)
- : base (child, return_type)
- {
- mode = m;
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- // This should never be invoked, we are born in fully
- // initialized state.
- return this;
- }
- public override string ToString ()
- {
- return String.Format ("ConvCast ({0}, {1})", mode, child);
- }
-
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
- Emit (ec, mode);
- }
- public static void Emit (EmitContext ec, Mode mode)
- {
- if (ec.HasSet (EmitContext.Options.CheckedScope)) {
- switch (mode){
- case Mode.I1_U1: ec.Emit (OpCodes.Conv_Ovf_U1); break;
- case Mode.I1_U2: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.I1_U4: ec.Emit (OpCodes.Conv_Ovf_U4); break;
- case Mode.I1_U8: ec.Emit (OpCodes.Conv_Ovf_U8); break;
- case Mode.I1_CH: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.U1_I1: ec.Emit (OpCodes.Conv_Ovf_I1_Un); break;
- case Mode.U1_CH: /* nothing */ break;
- case Mode.I2_I1: ec.Emit (OpCodes.Conv_Ovf_I1); break;
- case Mode.I2_U1: ec.Emit (OpCodes.Conv_Ovf_U1); break;
- case Mode.I2_U2: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.I2_U4: ec.Emit (OpCodes.Conv_Ovf_U4); break;
- case Mode.I2_U8: ec.Emit (OpCodes.Conv_Ovf_U8); break;
- case Mode.I2_CH: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.U2_I1: ec.Emit (OpCodes.Conv_Ovf_I1_Un); break;
- case Mode.U2_U1: ec.Emit (OpCodes.Conv_Ovf_U1_Un); break;
- case Mode.U2_I2: ec.Emit (OpCodes.Conv_Ovf_I2_Un); break;
- case Mode.U2_CH: /* nothing */ break;
- case Mode.I4_I1: ec.Emit (OpCodes.Conv_Ovf_I1); break;
- case Mode.I4_U1: ec.Emit (OpCodes.Conv_Ovf_U1); break;
- case Mode.I4_I2: ec.Emit (OpCodes.Conv_Ovf_I2); break;
- case Mode.I4_U4: ec.Emit (OpCodes.Conv_Ovf_U4); break;
- case Mode.I4_U2: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.I4_U8: ec.Emit (OpCodes.Conv_Ovf_U8); break;
- case Mode.I4_CH: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.U4_I1: ec.Emit (OpCodes.Conv_Ovf_I1_Un); break;
- case Mode.U4_U1: ec.Emit (OpCodes.Conv_Ovf_U1_Un); break;
- case Mode.U4_I2: ec.Emit (OpCodes.Conv_Ovf_I2_Un); break;
- case Mode.U4_U2: ec.Emit (OpCodes.Conv_Ovf_U2_Un); break;
- case Mode.U4_I4: ec.Emit (OpCodes.Conv_Ovf_I4_Un); break;
- case Mode.U4_CH: ec.Emit (OpCodes.Conv_Ovf_U2_Un); break;
- case Mode.I8_I1: ec.Emit (OpCodes.Conv_Ovf_I1); break;
- case Mode.I8_U1: ec.Emit (OpCodes.Conv_Ovf_U1); break;
- case Mode.I8_I2: ec.Emit (OpCodes.Conv_Ovf_I2); break;
- case Mode.I8_U2: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.I8_I4: ec.Emit (OpCodes.Conv_Ovf_I4); break;
- case Mode.I8_U4: ec.Emit (OpCodes.Conv_Ovf_U4); break;
- case Mode.I8_U8: ec.Emit (OpCodes.Conv_Ovf_U8); break;
- case Mode.I8_CH: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.I8_I: ec.Emit (OpCodes.Conv_Ovf_U); break;
- case Mode.U8_I1: ec.Emit (OpCodes.Conv_Ovf_I1_Un); break;
- case Mode.U8_U1: ec.Emit (OpCodes.Conv_Ovf_U1_Un); break;
- case Mode.U8_I2: ec.Emit (OpCodes.Conv_Ovf_I2_Un); break;
- case Mode.U8_U2: ec.Emit (OpCodes.Conv_Ovf_U2_Un); break;
- case Mode.U8_I4: ec.Emit (OpCodes.Conv_Ovf_I4_Un); break;
- case Mode.U8_U4: ec.Emit (OpCodes.Conv_Ovf_U4_Un); break;
- case Mode.U8_I8: ec.Emit (OpCodes.Conv_Ovf_I8_Un); break;
- case Mode.U8_CH: ec.Emit (OpCodes.Conv_Ovf_U2_Un); break;
- case Mode.U8_I: ec.Emit (OpCodes.Conv_Ovf_U_Un); break;
- case Mode.CH_I1: ec.Emit (OpCodes.Conv_Ovf_I1_Un); break;
- case Mode.CH_U1: ec.Emit (OpCodes.Conv_Ovf_U1_Un); break;
- case Mode.CH_I2: ec.Emit (OpCodes.Conv_Ovf_I2_Un); break;
- case Mode.R4_I1: ec.Emit (OpCodes.Conv_Ovf_I1); break;
- case Mode.R4_U1: ec.Emit (OpCodes.Conv_Ovf_U1); break;
- case Mode.R4_I2: ec.Emit (OpCodes.Conv_Ovf_I2); break;
- case Mode.R4_U2: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.R4_I4: ec.Emit (OpCodes.Conv_Ovf_I4); break;
- case Mode.R4_U4: ec.Emit (OpCodes.Conv_Ovf_U4); break;
- case Mode.R4_I8: ec.Emit (OpCodes.Conv_Ovf_I8); break;
- case Mode.R4_U8: ec.Emit (OpCodes.Conv_Ovf_U8); break;
- case Mode.R4_CH: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.R8_I1: ec.Emit (OpCodes.Conv_Ovf_I1); break;
- case Mode.R8_U1: ec.Emit (OpCodes.Conv_Ovf_U1); break;
- case Mode.R8_I2: ec.Emit (OpCodes.Conv_Ovf_I2); break;
- case Mode.R8_U2: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.R8_I4: ec.Emit (OpCodes.Conv_Ovf_I4); break;
- case Mode.R8_U4: ec.Emit (OpCodes.Conv_Ovf_U4); break;
- case Mode.R8_I8: ec.Emit (OpCodes.Conv_Ovf_I8); break;
- case Mode.R8_U8: ec.Emit (OpCodes.Conv_Ovf_U8); break;
- case Mode.R8_CH: ec.Emit (OpCodes.Conv_Ovf_U2); break;
- case Mode.R8_R4: ec.Emit (OpCodes.Conv_R4); break;
- case Mode.I_I8: ec.Emit (OpCodes.Conv_Ovf_I8_Un); break;
- }
- } else {
- switch (mode){
- case Mode.I1_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.I1_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I1_U4: ec.Emit (OpCodes.Conv_U4); break;
- case Mode.I1_U8: ec.Emit (OpCodes.Conv_I8); break;
- case Mode.I1_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.U1_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.U1_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I2_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.I2_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.I2_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I2_U4: ec.Emit (OpCodes.Conv_U4); break;
- case Mode.I2_U8: ec.Emit (OpCodes.Conv_I8); break;
- case Mode.I2_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.U2_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.U2_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.U2_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.U2_CH: /* nothing */ break;
- case Mode.I4_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.I4_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.I4_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.I4_U4: /* nothing */ break;
- case Mode.I4_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I4_U8: ec.Emit (OpCodes.Conv_I8); break;
- case Mode.I4_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.U4_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.U4_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.U4_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.U4_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.U4_I4: /* nothing */ break;
- case Mode.U4_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I8_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.I8_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.I8_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.I8_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I8_I4: ec.Emit (OpCodes.Conv_I4); break;
- case Mode.I8_U4: ec.Emit (OpCodes.Conv_U4); break;
- case Mode.I8_U8: /* nothing */ break;
- case Mode.I8_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.I8_I: ec.Emit (OpCodes.Conv_U); break;
- case Mode.U8_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.U8_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.U8_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.U8_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.U8_I4: ec.Emit (OpCodes.Conv_I4); break;
- case Mode.U8_U4: ec.Emit (OpCodes.Conv_U4); break;
- case Mode.U8_I8: /* nothing */ break;
- case Mode.U8_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.U8_I: ec.Emit (OpCodes.Conv_U); break;
- case Mode.CH_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.CH_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.CH_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.R4_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.R4_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.R4_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.R4_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.R4_I4: ec.Emit (OpCodes.Conv_I4); break;
- case Mode.R4_U4: ec.Emit (OpCodes.Conv_U4); break;
- case Mode.R4_I8: ec.Emit (OpCodes.Conv_I8); break;
- case Mode.R4_U8: ec.Emit (OpCodes.Conv_U8); break;
- case Mode.R4_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.R8_I1: ec.Emit (OpCodes.Conv_I1); break;
- case Mode.R8_U1: ec.Emit (OpCodes.Conv_U1); break;
- case Mode.R8_I2: ec.Emit (OpCodes.Conv_I2); break;
- case Mode.R8_U2: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.R8_I4: ec.Emit (OpCodes.Conv_I4); break;
- case Mode.R8_U4: ec.Emit (OpCodes.Conv_U4); break;
- case Mode.R8_I8: ec.Emit (OpCodes.Conv_I8); break;
- case Mode.R8_U8: ec.Emit (OpCodes.Conv_U8); break;
- case Mode.R8_CH: ec.Emit (OpCodes.Conv_U2); break;
- case Mode.R8_R4: ec.Emit (OpCodes.Conv_R4); break;
- case Mode.I_I8: ec.Emit (OpCodes.Conv_U8); break;
- }
- }
- }
- }
-
- class OpcodeCast : TypeCast
- {
- readonly OpCode op;
-
- public OpcodeCast (Expression child, TypeSpec return_type, OpCode op)
- : base (child, return_type)
- {
- this.op = op;
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- // This should never be invoked, we are born in fully
- // initialized state.
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
- ec.Emit (op);
- }
- public TypeSpec UnderlyingType {
- get { return child.Type; }
- }
- }
- //
- // Opcode casts expression with 2 opcodes but only
- // single expression tree node
- //
- class OpcodeCastDuplex : OpcodeCast
- {
- readonly OpCode second;
- public OpcodeCastDuplex (Expression child, TypeSpec returnType, OpCode first, OpCode second)
- : base (child, returnType, first)
- {
- this.second = second;
- }
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
- ec.Emit (second);
- }
- }
- /// <summary>
- /// This kind of cast is used to encapsulate a child and cast it
- /// to the class requested
- /// </summary>
- public sealed class ClassCast : TypeCast {
- readonly bool forced;
-
- public ClassCast (Expression child, TypeSpec return_type)
- : base (child, return_type)
- {
- }
-
- public ClassCast (Expression child, TypeSpec return_type, bool forced)
- : base (child, return_type)
- {
- this.forced = forced;
- }
- public override void Emit (EmitContext ec)
- {
- base.Emit (ec);
- bool gen = TypeManager.IsGenericParameter (child.Type);
- if (gen)
- ec.Emit (OpCodes.Box, child.Type);
-
- if (type.IsGenericParameter) {
- ec.Emit (OpCodes.Unbox_Any, type);
- return;
- }
-
- if (gen && !forced)
- return;
-
- ec.Emit (OpCodes.Castclass, type);
- }
- }
- //
- // Created during resolving pahse when an expression is wrapped or constantified
- // and original expression can be used later (e.g. for expression trees)
- //
- public class ReducedExpression : Expression
- {
- public sealed class ReducedConstantExpression : EmptyConstantCast
- {
- readonly Expression orig_expr;
- public ReducedConstantExpression (Constant expr, Expression orig_expr)
- : base (expr, expr.Type)
- {
- this.orig_expr = orig_expr;
- }
- public Expression OriginalExpression {
- get {
- return orig_expr;
- }
- }
- public override Constant ConvertImplicitly (TypeSpec target_type)
- {
- Constant c = base.ConvertImplicitly (target_type);
- if (c != null)
- c = new ReducedConstantExpression (c, orig_expr);
- return c;
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- return orig_expr.CreateExpressionTree (ec);
- }
- public override Constant ConvertExplicitly (bool in_checked_context, TypeSpec target_type)
- {
- Constant c = base.ConvertExplicitly (in_checked_context, target_type);
- if (c != null)
- c = new ReducedConstantExpression (c, orig_expr);
- return c;
- }
- public override void EncodeAttributeValue (IMemberContext rc, AttributeEncoder enc, TypeSpec targetType, TypeSpec parameterType)
- {
- //
- // LAMESPEC: Reduced conditional expression is allowed as an attribute argument
- //
- if (orig_expr is Conditional)
- child.EncodeAttributeValue (rc, enc, targetType,parameterType);
- else
- base.EncodeAttributeValue (rc, enc, targetType, parameterType);
- }
- }
- sealed class ReducedExpressionStatement : ExpressionStatement
- {
- readonly Expression orig_expr;
- readonly ExpressionStatement stm;
- public ReducedExpressionStatement (ExpressionStatement stm, Expression orig)
- {
- this.orig_expr = orig;
- this.stm = stm;
- this.eclass = stm.eclass;
- this.type = stm.Type;
- this.loc = orig.Location;
- }
- public override bool ContainsEmitWithAwait ()
- {
- return stm.ContainsEmitWithAwait ();
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- return orig_expr.CreateExpressionTree (ec);
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- stm.Emit (ec);
- }
- public override void EmitStatement (EmitContext ec)
- {
- stm.EmitStatement (ec);
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- stm.FlowAnalysis (fc);
- }
- }
- readonly Expression expr, orig_expr;
- private ReducedExpression (Expression expr, Expression orig_expr)
- {
- this.expr = expr;
- this.eclass = expr.eclass;
- this.type = expr.Type;
- this.orig_expr = orig_expr;
- this.loc = orig_expr.Location;
- }
- #region Properties
- public override bool IsSideEffectFree {
- get {
- return expr.IsSideEffectFree;
- }
- }
- public Expression OriginalExpression {
- get {
- return orig_expr;
- }
- }
- #endregion
- public override bool ContainsEmitWithAwait ()
- {
- return expr.ContainsEmitWithAwait ();
- }
- //
- // Creates fully resolved expression switcher
- //
- public static Constant Create (Constant expr, Expression original_expr)
- {
- if (expr.eclass == ExprClass.Unresolved)
- throw new ArgumentException ("Unresolved expression");
- return new ReducedConstantExpression (expr, original_expr);
- }
- public static ExpressionStatement Create (ExpressionStatement s, Expression orig)
- {
- return new ReducedExpressionStatement (s, orig);
- }
- public static Expression Create (Expression expr, Expression original_expr)
- {
- return Create (expr, original_expr, true);
- }
- //
- // Creates unresolved reduce expression. The original expression has to be
- // already resolved. Created expression is constant based based on `expr'
- // value unless canBeConstant is used
- //
- public static Expression Create (Expression expr, Expression original_expr, bool canBeConstant)
- {
- if (canBeConstant) {
- Constant c = expr as Constant;
- if (c != null)
- return Create (c, original_expr);
- }
- ExpressionStatement s = expr as ExpressionStatement;
- if (s != null)
- return Create (s, original_expr);
- if (expr.eclass == ExprClass.Unresolved)
- throw new ArgumentException ("Unresolved expression");
- return new ReducedExpression (expr, original_expr);
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- return orig_expr.CreateExpressionTree (ec);
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- expr.Emit (ec);
- }
- public override Expression EmitToField (EmitContext ec)
- {
- return expr.EmitToField(ec);
- }
- public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
- {
- expr.EmitBranchable (ec, target, on_true);
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- expr.FlowAnalysis (fc);
- }
- public override SLE.Expression MakeExpression (BuilderContext ctx)
- {
- return orig_expr.MakeExpression (ctx);
- }
- }
- //
- // Standard composite pattern
- //
- public abstract class CompositeExpression : Expression
- {
- protected Expression expr;
- protected CompositeExpression (Expression expr)
- {
- this.expr = expr;
- this.loc = expr.Location;
- }
- public override bool ContainsEmitWithAwait ()
- {
- return expr.ContainsEmitWithAwait ();
- }
- public override Expression CreateExpressionTree (ResolveContext rc)
- {
- return expr.CreateExpressionTree (rc);
- }
- public Expression Child {
- get { return expr; }
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- expr = expr.Resolve (rc);
- if (expr == null)
- return null;
- type = expr.Type;
- eclass = expr.eclass;
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- expr.Emit (ec);
- }
- public override bool IsNull {
- get { return expr.IsNull; }
- }
- }
- //
- // Base of expressions used only to narrow resolve flow
- //
- public abstract class ShimExpression : Expression
- {
- protected Expression expr;
- protected ShimExpression (Expression expr)
- {
- this.expr = expr;
- }
- public Expression Expr {
- get {
- return expr;
- }
- }
- protected override void CloneTo (CloneContext clonectx, Expression t)
- {
- if (expr == null)
- return;
- ShimExpression target = (ShimExpression) t;
- target.expr = expr.Clone (clonectx);
- }
- public override bool ContainsEmitWithAwait ()
- {
- return expr.ContainsEmitWithAwait ();
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- throw new NotSupportedException ("ET");
- }
- public override void Emit (EmitContext ec)
- {
- throw new InternalErrorException ("Missing Resolve call");
- }
- }
- public class UnreachableExpression : Expression
- {
- public UnreachableExpression (Expression expr)
- {
- this.loc = expr.Location;
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- // TODO: is it ok
- throw new NotImplementedException ();
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- throw new NotSupportedException ();
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- fc.Report.Warning (429, 4, loc, "Unreachable expression code detected");
- }
- public override void Emit (EmitContext ec)
- {
- }
- public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
- {
- }
- }
- //
- // Unresolved type name expressions
- //
- public abstract class ATypeNameExpression : FullNamedExpression
- {
- string name;
- protected TypeArguments targs;
- protected ATypeNameExpression (string name, Location l)
- {
- this.name = name;
- loc = l;
- }
- protected ATypeNameExpression (string name, TypeArguments targs, Location l)
- {
- this.name = name;
- this.targs = targs;
- loc = l;
- }
- protected ATypeNameExpression (string name, int arity, Location l)
- : this (name, new UnboundTypeArguments (arity), l)
- {
- }
- #region Properties
- protected int Arity {
- get {
- return targs == null ? 0 : targs.Count;
- }
- }
- public bool HasTypeArguments {
- get {
- return targs != null && !targs.IsEmpty;
- }
- }
- public string Name {
- get {
- return name;
- }
- set {
- name = value;
- }
- }
- public TypeArguments TypeArguments {
- get {
- return targs;
- }
- }
- #endregion
- public override bool Equals (object obj)
- {
- ATypeNameExpression atne = obj as ATypeNameExpression;
- return atne != null && atne.Name == Name &&
- (targs == null || targs.Equals (atne.targs));
- }
- protected void Error_OpenGenericTypeIsNotAllowed (IMemberContext mc)
- {
- mc.Module.Compiler.Report.Error (7003, Location, "Unbound generic name is not valid in this context");
- }
- public override int GetHashCode ()
- {
- return Name.GetHashCode ();
- }
- // TODO: Move it to MemberCore
- public static string GetMemberType (MemberCore mc)
- {
- if (mc is Property)
- return "property";
- if (mc is Indexer)
- return "indexer";
- if (mc is FieldBase)
- return "field";
- if (mc is MethodCore)
- return "method";
- if (mc is EnumMember)
- return "enum";
- if (mc is Event)
- return "event";
- return "type";
- }
- public override string GetSignatureForError ()
- {
- if (targs != null) {
- return Name + "<" + targs.GetSignatureForError () + ">";
- }
- return Name;
- }
- public abstract Expression LookupNameExpression (ResolveContext rc, MemberLookupRestrictions restriction);
- }
-
- /// <summary>
- /// SimpleName expressions are formed of a single word and only happen at the beginning
- /// of a dotted-name.
- /// </summary>
- public class SimpleName : ATypeNameExpression
- {
- public SimpleName (string name, Location l)
- : base (name, l)
- {
- }
- public SimpleName (string name, TypeArguments args, Location l)
- : base (name, args, l)
- {
- }
- public SimpleName (string name, int arity, Location l)
- : base (name, arity, l)
- {
- }
- public SimpleName GetMethodGroup ()
- {
- return new SimpleName (Name, targs, loc);
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- return SimpleNameResolve (rc, null);
- }
- public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
- {
- return SimpleNameResolve (ec, right_side);
- }
- public void Error_NameDoesNotExist (ResolveContext rc)
- {
- rc.Report.Error (103, loc, "The name `{0}' does not exist in the current context", Name);
- }
- protected virtual void Error_TypeOrNamespaceNotFound (IMemberContext ctx)
- {
- if (ctx.CurrentType != null) {
- var member = MemberLookup (ctx, false, ctx.CurrentType, Name, 0, MemberLookupRestrictions.ExactArity, loc) as MemberExpr;
- if (member != null) {
- Error_UnexpectedKind (ctx, member, "type", member.KindName, loc);
- return;
- }
- }
- var report = ctx.Module.Compiler.Report;
- var retval = ctx.LookupNamespaceOrType (Name, Arity, LookupMode.IgnoreAccessibility, loc);
- if (retval != null) {
- report.SymbolRelatedToPreviousError (retval.Type);
- ErrorIsInaccesible (ctx, retval.GetSignatureForError (), loc);
- return;
- }
- retval = ctx.LookupNamespaceOrType (Name, -System.Math.Max (1, Arity), LookupMode.Probing, loc);
- if (retval != null) {
- Error_TypeArgumentsCannotBeUsed (ctx, retval.Type, loc);
- return;
- }
- var ns_candidates = ctx.Module.GlobalRootNamespace.FindTypeNamespaces (ctx, Name, Arity);
- if (ns_candidates != null) {
- if (ctx is UsingAliasNamespace.AliasContext) {
- report.Error (246, loc,
- "The type or namespace name `{1}' could not be found. Consider using fully qualified name `{0}.{1}'",
- ns_candidates[0], Name);
- } else {
- string usings = string.Join ("' or `", ns_candidates.ToArray ());
- report.Error (246, loc,
- "The type or namespace name `{0}' could not be found. Are you missing `{1}' using directive?",
- Name, usings);
- }
- } else {
- report.Error (246, loc,
- "The type or namespace name `{0}' could not be found. Are you missing an assembly reference?",
- Name);
- }
- }
- public override FullNamedExpression ResolveAsTypeOrNamespace (IMemberContext mc, bool allowUnboundTypeArguments)
- {
- FullNamedExpression fne = mc.LookupNamespaceOrType (Name, Arity, LookupMode.Normal, loc);
- if (fne != null) {
- if (fne.Type != null && Arity > 0) {
- if (HasTypeArguments) {
- GenericTypeExpr ct = new GenericTypeExpr (fne.Type, targs, loc);
- if (ct.ResolveAsType (mc) == null)
- return null;
- return ct;
- }
- if (!allowUnboundTypeArguments)
- Error_OpenGenericTypeIsNotAllowed (mc);
- return new GenericOpenTypeExpr (fne.Type, loc);
- }
- //
- // dynamic namespace is ignored when dynamic is allowed (does not apply to types)
- //
- if (!(fne is NamespaceExpression))
- return fne;
- }
- if (Arity == 0 && Name == "dynamic" && mc.Module.Compiler.Settings.Version > LanguageVersion.V_3) {
- if (!mc.Module.PredefinedAttributes.Dynamic.IsDefined) {
- mc.Module.Compiler.Report.Error (1980, Location,
- "Dynamic keyword requires `{0}' to be defined. Are you missing System.Core.dll assembly reference?",
- mc.Module.PredefinedAttributes.Dynamic.GetSignatureForError ());
- }
- fne = new DynamicTypeExpr (loc);
- fne.ResolveAsType (mc);
- }
- if (fne != null)
- return fne;
- Error_TypeOrNamespaceNotFound (mc);
- return null;
- }
- public bool IsPossibleTypeOrNamespace (IMemberContext mc)
- {
- return mc.LookupNamespaceOrType (Name, Arity, LookupMode.Probing, loc) != null;
- }
- public override Expression LookupNameExpression (ResolveContext rc, MemberLookupRestrictions restrictions)
- {
- int lookup_arity = Arity;
- bool errorMode = false;
- Expression e;
- Block current_block = rc.CurrentBlock;
- INamedBlockVariable variable = null;
- bool variable_found = false;
- while (true) {
- //
- // Stage 1: binding to local variables or parameters
- //
- // LAMESPEC: It should take invocableOnly into account but that would break csc compatibility
- //
- if (current_block != null && lookup_arity == 0) {
- if (current_block.ParametersBlock.TopBlock.GetLocalName (Name, current_block.Original, ref variable)) {
- if (!variable.IsDeclared) {
- // We found local name in accessible block but it's not
- // initialized yet, maybe the user wanted to bind to something else
- errorMode = true;
- variable_found = true;
- } else {
- e = variable.CreateReferenceExpression (rc, loc);
- if (e != null) {
- if (Arity > 0)
- Error_TypeArgumentsCannotBeUsed (rc, "variable", Name, loc);
- return e;
- }
- }
- }
- }
- //
- // Stage 2: Lookup members if we are inside a type up to top level type for nested types
- //
- TypeSpec member_type = rc.CurrentType;
- for (; member_type != null; member_type = member_type.DeclaringType) {
- e = MemberLookup (rc, errorMode, member_type, Name, lookup_arity, restrictions, loc);
- if (e == null)
- continue;
- var me = e as MemberExpr;
- if (me == null) {
- // The name matches a type, defer to ResolveAsTypeStep
- if (e is TypeExpr)
- break;
- continue;
- }
- if (errorMode) {
- if (variable != null) {
- if (me is FieldExpr || me is ConstantExpr || me is EventExpr || me is PropertyExpr) {
- rc.Report.Error (844, loc,
- "A local variable `{0}' cannot be used before it is declared. Consider renaming the local variable when it hides the member `{1}'",
- Name, me.GetSignatureForError ());
- } else {
- break;
- }
- } else if (me is MethodGroupExpr || me is PropertyExpr || me is IndexerExpr) {
- // Leave it to overload resolution to report correct error
- } else {
- // TODO: rc.Report.SymbolRelatedToPreviousError ()
- ErrorIsInaccesible (rc, me.GetSignatureForError (), loc);
- }
- } else {
- // LAMESPEC: again, ignores InvocableOnly
- if (variable != null) {
- rc.Report.SymbolRelatedToPreviousError (variable.Location, Name);
- rc.Report.Error (135, loc, "`{0}' conflicts with a declaration in a child block", Name);
- }
- //
- // MemberLookup does not check accessors availability, this is actually needed for properties only
- //
- var pe = me as PropertyExpr;
- if (pe != null) {
- // Break as there is no other overload available anyway
- if ((restrictions & MemberLookupRestrictions.ReadAccess) != 0) {
- if (!pe.PropertyInfo.HasGet || !pe.PropertyInfo.Get.IsAccessible (rc))
- break;
- pe.Getter = pe.PropertyInfo.Get;
- } else {
- if (!pe.PropertyInfo.HasSet || !pe.PropertyInfo.Set.IsAccessible (rc))
- break;
- pe.Setter = pe.PropertyInfo.Set;
- }
- }
- }
- // TODO: It's used by EventExpr -> FieldExpr transformation only
- // TODO: Should go to MemberAccess
- me = me.ResolveMemberAccess (rc, null, null);
- if (Arity > 0) {
- targs.Resolve (rc);
- me.SetTypeArguments (rc, targs);
- }
- return me;
- }
- //
- // Stage 3: Lookup nested types, namespaces and type parameters in the context
- //
- if ((restrictions & MemberLookupRestrictions.InvocableOnly) == 0 && !variable_found) {
- if (IsPossibleTypeOrNamespace (rc)) {
- if (variable != null) {
- rc.Report.SymbolRelatedToPreviousError (variable.Location, Name);
- rc.Report.Error (135, loc, "`{0}' conflicts with a declaration in a child block", Name);
- }
- return ResolveAsTypeOrNamespace (rc, false);
- }
- }
- var mg = NamespaceContainer.LookupStaticUsings (rc, Name, Arity, loc);
- if (mg != null) {
- if (Arity > 0) {
- targs.Resolve (rc);
- mg.SetTypeArguments (rc, targs);
- }
- return mg;
- }
- if (Name == "nameof")
- return new NameOf (this);
- if (errorMode) {
- if (variable_found) {
- rc.Report.Error (841, loc, "A local variable `{0}' cannot be used before it is declared", Name);
- } else {
- if (Arity > 0) {
- var tparams = rc.CurrentTypeParameters;
- if (tparams != null) {
- if (tparams.Find (Name) != null) {
- Error_TypeArgumentsCannotBeUsed (rc, "type parameter", Name, loc);
- return null;
- }
- }
- var ct = rc.CurrentType;
- do {
- if (ct.MemberDefinition.TypeParametersCount > 0) {
- foreach (var ctp in ct.MemberDefinition.TypeParameters) {
- if (ctp.Name == Name) {
- Error_TypeArgumentsCannotBeUsed (rc, "type parameter", Name, loc);
- return null;
- }
- }
- }
- ct = ct.DeclaringType;
- } while (ct != null);
- }
- if ((restrictions & MemberLookupRestrictions.InvocableOnly) == 0) {
- e = rc.LookupNamespaceOrType (Name, Arity, LookupMode.IgnoreAccessibility, loc);
- if (e != null) {
- rc.Report.SymbolRelatedToPreviousError (e.Type);
- ErrorIsInaccesible (rc, e.GetSignatureForError (), loc);
- return e;
- }
- } else {
- var me = MemberLookup (rc, false, rc.CurrentType, Name, Arity, restrictions & ~MemberLookupRestrictions.InvocableOnly, loc) as MemberExpr;
- if (me != null) {
- Error_UnexpectedKind (rc, me, "method group", me.KindName, loc);
- return ErrorExpression.Instance;
- }
- }
- e = rc.LookupNamespaceOrType (Name, -System.Math.Max (1, Arity), LookupMode.Probing, loc);
- if (e != null) {
- if (e.Type.Arity != Arity && (restrictions & MemberLookupRestrictions.IgnoreArity) == 0) {
- Error_TypeArgumentsCannotBeUsed (rc, e.Type, loc);
- return e;
- }
- if (e is TypeExpr) {
- // TypeExpression does not have correct location
- if (e is TypeExpression)
- e = new TypeExpression (e.Type, loc);
- return e;
- }
- }
- Error_NameDoesNotExist (rc);
- }
- return ErrorExpression.Instance;
- }
- if (rc.Module.Evaluator != null) {
- var fi = rc.Module.Evaluator.LookupField (Name);
- if (fi != null)
- return new FieldExpr (fi.Item1, loc);
- }
- lookup_arity = 0;
- errorMode = true;
- }
- }
-
- Expression SimpleNameResolve (ResolveContext ec, Expression right_side)
- {
- Expression e = LookupNameExpression (ec, right_side == null ? MemberLookupRestrictions.ReadAccess : MemberLookupRestrictions.None);
- if (e == null)
- return null;
- if (e is FullNamedExpression && e.eclass != ExprClass.Unresolved) {
- Error_UnexpectedKind (ec, e, "variable", e.ExprClassName, loc);
- return e;
- }
- if (right_side != null) {
- e = e.ResolveLValue (ec, right_side);
- } else {
- e = e.Resolve (ec);
- }
- return e;
- }
-
- public override object Accept (StructuralVisitor visitor)
- {
- return visitor.Visit (this);
- }
- }
- /// <summary>
- /// Represents a namespace or a type. The name of the class was inspired by
- /// section 10.8.1 (Fully Qualified Names).
- /// </summary>
- public abstract class FullNamedExpression : Expression
- {
- protected override void CloneTo (CloneContext clonectx, Expression target)
- {
- // Do nothing, most unresolved type expressions cannot be
- // resolved to different type
- }
- public override bool ContainsEmitWithAwait ()
- {
- return false;
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- throw new NotSupportedException ("ET");
- }
- public abstract FullNamedExpression ResolveAsTypeOrNamespace (IMemberContext mc, bool allowUnboundTypeArguments);
- //
- // This is used to resolve the expression as a type, a null
- // value will be returned if the expression is not a type
- // reference
- //
- public override TypeSpec ResolveAsType (IMemberContext mc, bool allowUnboundTypeArguments = false)
- {
- FullNamedExpression fne = ResolveAsTypeOrNamespace (mc, allowUnboundTypeArguments);
- if (fne == null)
- return null;
- TypeExpr te = fne as TypeExpr;
- if (te == null) {
- Error_UnexpectedKind (mc, fne, "type", fne.ExprClassName, loc);
- return null;
- }
- te.loc = loc;
- type = te.Type;
- var dep = type.GetMissingDependencies ();
- if (dep != null) {
- ImportedTypeDefinition.Error_MissingDependency (mc, dep, loc);
- }
- if (type.Kind == MemberKind.Void) {
- mc.Module.Compiler.Report.Error (673, loc, "System.Void cannot be used from C#. Consider using `void'");
- }
- //
- // Obsolete checks cannot be done when resolving base context as they
- // require type dependencies to be set but we are in process of resolving them
- //
- if (!(mc is TypeDefinition.BaseContext) && !(mc is UsingAliasNamespace.AliasContext)) {
- ObsoleteAttribute obsolete_attr = type.GetAttributeObsolete ();
- if (obsolete_attr != null && !mc.IsObsolete) {
- AttributeTester.Report_ObsoleteMessage (obsolete_attr, te.GetSignatureForError (), Location, mc.Module.Compiler.Report);
- }
- }
- return type;
- }
- public override void Emit (EmitContext ec)
- {
- throw new InternalErrorException ("FullNamedExpression `{0}' found in resolved tree",
- GetSignatureForError ());
- }
- }
-
- /// <summary>
- /// Expression that evaluates to a type
- /// </summary>
- public abstract class TypeExpr : FullNamedExpression
- {
- public sealed override FullNamedExpression ResolveAsTypeOrNamespace (IMemberContext mc, bool allowUnboundTypeArguments)
- {
- ResolveAsType (mc);
- return this;
- }
- protected sealed override Expression DoResolve (ResolveContext ec)
- {
- ResolveAsType (ec);
- return this;
- }
- public override bool Equals (object obj)
- {
- TypeExpr tobj = obj as TypeExpr;
- if (tobj == null)
- return false;
- return Type == tobj.Type;
- }
- public override int GetHashCode ()
- {
- return Type.GetHashCode ();
- }
- }
- /// <summary>
- /// Fully resolved Expression that already evaluated to a type
- /// </summary>
- public class TypeExpression : TypeExpr
- {
- public TypeExpression (TypeSpec t, Location l)
- {
- Type = t;
- eclass = ExprClass.Type;
- loc = l;
- }
- public sealed override TypeSpec ResolveAsType (IMemberContext mc, bool allowUnboundTypeArguments = false)
- {
- return type;
- }
- public override object Accept (StructuralVisitor visitor)
- {
- return visitor.Visit (this);
- }
- }
- public class NamespaceExpression : FullNamedExpression
- {
- readonly Namespace ns;
- public NamespaceExpression (Namespace ns, Location loc)
- {
- this.ns = ns;
- this.Type = InternalType.Namespace;
- this.eclass = ExprClass.Namespace;
- this.loc = loc;
- }
- public Namespace Namespace {
- get {
- return ns;
- }
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- throw new NotImplementedException ();
- }
- public override FullNamedExpression ResolveAsTypeOrNamespace (IMemberContext mc, bool allowUnboundTypeArguments)
- {
- return this;
- }
- public void Error_NamespaceDoesNotExist (IMemberContext ctx, string name, int arity)
- {
- var retval = Namespace.LookupType (ctx, name, arity, LookupMode.IgnoreAccessibility, loc);
- if (retval != null) {
- // ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (retval.MemberDefinition);
- ErrorIsInaccesible (ctx, retval.GetSignatureForError (), loc);
- return;
- }
- retval = Namespace.LookupType (ctx, name, -System.Math.Max (1, arity), LookupMode.Probing, loc);
- if (retval != null) {
- Error_TypeArgumentsCannotBeUsed (ctx, retval, loc);
- return;
- }
- Namespace ns;
- if (arity > 0 && Namespace.TryGetNamespace (name, out ns)) {
- Error_TypeArgumentsCannotBeUsed (ctx, ExprClassName, ns.GetSignatureForError (), loc);
- return;
- }
- string assembly = null;
- string possible_name = Namespace.GetSignatureForError () + "." + name;
- // Only assembly unique name should be added
- switch (possible_name) {
- case "System.Drawing":
- case "System.Web.Services":
- case "System.Web":
- case "System.Data":
- case "System.Configuration":
- case "System.Data.Services":
- case "System.DirectoryServices":
- case "System.Json":
- case "System.Net.Http":
- case "System.Numerics":
- case "System.Runtime.Caching":
- case "System.ServiceModel":
- case "System.Transactions":
- case "System.Web.Routing":
- case "System.Xml.Linq":
- case "System.Xml":
- assembly = possible_name;
- break;
- case "System.Linq":
- case "System.Linq.Expressions":
- assembly = "System.Core";
- break;
- case "System.Windows.Forms":
- case "System.Windows.Forms.Layout":
- assembly = "System.Windows.Forms";
- break;
- }
- assembly = assembly == null ? "an" : "`" + assembly + "'";
- if (Namespace is GlobalRootNamespace) {
- ctx.Module.Compiler.Report.Error (400, loc,
- "The type or namespace name `{0}' could not be found in the global namespace. Are you missing {1} assembly reference?",
- name, assembly);
- } else {
- ctx.Module.Compiler.Report.Error (234, loc,
- "The type or namespace name `{0}' does not exist in the namespace `{1}'. Are you missing {2} assembly reference?",
- name, GetSignatureForError (), assembly);
- }
- }
- public override string GetSignatureForError ()
- {
- return ns.GetSignatureForError ();
- }
- public FullNamedExpression LookupTypeOrNamespace (IMemberContext ctx, string name, int arity, LookupMode mode, Location loc)
- {
- return ns.LookupTypeOrNamespace (ctx, name, arity, mode, loc);
- }
- }
- /// <summary>
- /// This class denotes an expression which evaluates to a member
- /// of a struct or a class.
- /// </summary>
- public abstract class MemberExpr : Expression, OverloadResolver.IInstanceQualifier
- {
- protected bool conditional_access_receiver;
- //
- // An instance expression associated with this member, if it's a
- // non-static member
- //
- public Expression InstanceExpression;
- /// <summary>
- /// The name of this member.
- /// </summary>
- public abstract string Name {
- get;
- }
- //
- // When base.member is used
- //
- public bool IsBase {
- get { return InstanceExpression is BaseThis; }
- }
- /// <summary>
- /// Whether this is an instance member.
- /// </summary>
- public abstract bool IsInstance {
- get;
- }
- /// <summary>
- /// Whether this is a static member.
- /// </summary>
- public abstract bool IsStatic {
- get;
- }
- public abstract string KindName {
- get;
- }
- public bool ConditionalAccess { get; set; }
- protected abstract TypeSpec DeclaringType {
- get;
- }
- TypeSpec OverloadResolver.IInstanceQualifier.InstanceType {
- get {
- return InstanceExpression.Type;
- }
- }
- //
- // Converts best base candidate for virtual method starting from QueriedBaseType
- //
- protected MethodSpec CandidateToBaseOverride (ResolveContext rc, MethodSpec method)
- {
- //
- // Only when base.member is used and method is virtual
- //
- if (!IsBase)
- return method;
- //
- // Overload resulution works on virtual or non-virtual members only (no overrides). That
- // means for base.member access we have to find the closest match after we found best candidate
- //
- if ((method.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) != 0) {
- //
- // The method could already be what we are looking for
- //
- TypeSpec[] targs = null;
- if (method.DeclaringType != InstanceExpression.Type) {
- //
- // Candidate can have inflated MVAR parameters and we need to find
- // base match for original definition not inflated parameter types
- //
- var parameters = method.Parameters;
- if (method.Arity > 0) {
- parameters = ((IParametersMember) method.MemberDefinition).Parameters;
- var inflated = method.DeclaringType as InflatedTypeSpec;
- if (inflated != null) {
- parameters = parameters.Inflate (inflated.CreateLocalInflator (rc));
- }
- }
- var filter = new MemberFilter (method.Name, method.Arity, MemberKind.Method, parameters, null);
- var base_override = MemberCache.FindMember (InstanceExpression.Type, filter, BindingRestriction.InstanceOnly | BindingRestriction.OverrideOnly) as MethodSpec;
- if (base_override != null && base_override.DeclaringType != method.DeclaringType) {
- if (base_override.IsGeneric)
- targs = method.TypeArguments;
- method = base_override;
- }
- }
- //
- // When base access is used inside anonymous method/iterator/etc we need to
- // get back to the context of original type. We do it by emiting proxy
- // method in original class and rewriting base call to this compiler
- // generated method call which does the actual base invocation. This may
- // introduce redundant storey but with `this' only but it's tricky to avoid
- // at this stage as we don't know what expressions follow base
- //
- if (rc.CurrentAnonymousMethod != null) {
- if (targs == null && method.IsGeneric) {
- targs = method.TypeArguments;
- method = method.GetGenericMethodDefinition ();
- }
- if (method.Parameters.HasArglist)
- throw new NotImplementedException ("__arglist base call proxy");
- method = rc.CurrentMemberDefinition.Parent.PartialContainer.CreateHoistedBaseCallProxy (rc, method);
- // Ideally this should apply to any proxy rewrite but in the case of unary mutators on
- // get/set member expressions second call would fail to proxy because left expression
- // would be of 'this' and not 'base' because we share InstanceExpression for get/set
- // FIXME: The async check is another hack but will probably fail with mutators
- if (rc.CurrentType.IsStruct || rc.CurrentAnonymousMethod.Storey is AsyncTaskStorey)
- InstanceExpression = new This (loc).Resolve (rc);
- }
- if (targs != null)
- method = method.MakeGenericMethod (rc, targs);
- }
- //
- // Only base will allow this invocation to happen.
- //
- if (method.IsAbstract) {
- rc.Report.SymbolRelatedToPreviousError (method);
- Error_CannotCallAbstractBase (rc, method.GetSignatureForError ());
- }
- return method;
- }
- protected void CheckProtectedMemberAccess (ResolveContext rc, MemberSpec member)
- {
- if (InstanceExpression == null)
- return;
- if ((member.Modifiers & Modifiers.PROTECTED) != 0 && !(InstanceExpression is This)) {
- if (!CheckProtectedMemberAccess (rc, member, InstanceExpression.Type)) {
- Error_ProtectedMemberAccess (rc, member, InstanceExpression.Type, loc);
- }
- }
- }
- bool OverloadResolver.IInstanceQualifier.CheckProtectedMemberAccess (ResolveContext rc, MemberSpec member)
- {
- if (InstanceExpression == null)
- return true;
- return InstanceExpression is This || CheckProtectedMemberAccess (rc, member, InstanceExpression.Type);
- }
- public static bool CheckProtectedMemberAccess<T> (ResolveContext rc, T member, TypeSpec qualifier) where T : MemberSpec
- {
- var ct = rc.CurrentType;
- if (ct == qualifier)
- return true;
- if ((member.Modifiers & Modifiers.INTERNAL) != 0 && member.DeclaringType.MemberDefinition.IsInternalAsPublic (ct.MemberDefinition.DeclaringAssembly))
- return true;
- qualifier = qualifier.GetDefinition ();
- if (ct != qualifier && !IsSameOrBaseQualifier (ct, qualifier)) {
- return false;
- }
- return true;
- }
- public override bool ContainsEmitWithAwait ()
- {
- return InstanceExpression != null && InstanceExpression.ContainsEmitWithAwait ();
- }
- public override bool HasConditionalAccess ()
- {
- return ConditionalAccess || (InstanceExpression != null && InstanceExpression.HasConditionalAccess ());
- }
- static bool IsSameOrBaseQualifier (TypeSpec type, TypeSpec qtype)
- {
- do {
- type = type.GetDefinition ();
- if (type == qtype || TypeManager.IsFamilyAccessible (qtype, type))
- return true;
- type = type.DeclaringType;
- } while (type != null);
- return false;
- }
- protected void DoBestMemberChecks<T> (ResolveContext rc, T member) where T : MemberSpec, IInterfaceMemberSpec
- {
- if (InstanceExpression != null) {
- InstanceExpression = InstanceExpression.Resolve (rc);
- CheckProtectedMemberAccess (rc, member);
- }
- if (member.MemberType.IsPointer && !rc.IsUnsafe) {
- UnsafeError (rc, loc);
- }
- var dep = member.GetMissingDependencies ();
- if (dep != null) {
- ImportedTypeDefinition.Error_MissingDependency (rc, dep, loc);
- }
- if (!rc.IsObsolete) {
- ObsoleteAttribute oa = member.GetAttributeObsolete ();
- if (oa != null)
- AttributeTester.Report_ObsoleteMessage (oa, member.GetSignatureForError (), loc, rc.Report);
- }
- if (!(member is FieldSpec))
- member.MemberDefinition.SetIsUsed ();
- }
- protected virtual void Error_CannotCallAbstractBase (ResolveContext rc, string name)
- {
- rc.Report.Error (205, loc, "Cannot call an abstract base member `{0}'", name);
- }
- public static void Error_ProtectedMemberAccess (ResolveContext rc, MemberSpec member, TypeSpec qualifier, Location loc)
- {
- rc.Report.SymbolRelatedToPreviousError (member);
- rc.Report.Error (1540, loc,
- "Cannot access protected member `{0}' via a qualifier of type `{1}'. The qualifier must be of type `{2}' or derived from it",
- member.GetSignatureForError (), qualifier.GetSignatureForError (), rc.CurrentType.GetSignatureForError ());
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- if (InstanceExpression != null) {
- InstanceExpression.FlowAnalysis (fc);
- if (ConditionalAccess) {
- fc.BranchConditionalAccessDefiniteAssignment ();
- }
- }
- }
- protected void ResolveConditionalAccessReceiver (ResolveContext rc)
- {
- if (!rc.HasSet (ResolveContext.Options.ConditionalAccessReceiver)) {
- if (HasConditionalAccess ()) {
- conditional_access_receiver = true;
- rc.Set (ResolveContext.Options.ConditionalAccessReceiver);
- }
- }
- }
- public bool ResolveInstanceExpression (ResolveContext rc, Expression rhs)
- {
- if (!ResolveInstanceExpressionCore (rc, rhs))
- return false;
- //
- // Check intermediate value modification which won't have any effect
- //
- if (rhs != null && TypeSpec.IsValueType (InstanceExpression.Type)) {
- var fexpr = InstanceExpression as FieldExpr;
- if (fexpr != null) {
- if (!fexpr.Spec.IsReadOnly || rc.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.ConstructorScope))
- return true;
- if (fexpr.IsStatic) {
- rc.Report.Error (1650, loc, "Fields of static readonly field `{0}' cannot be assigned to (except in a static constructor or a variable initializer)",
- fexpr.GetSignatureForError ());
- } else {
- rc.Report.Error (1648, loc, "Members of readonly field `{0}' cannot be modified (except in a constructor or a variable initializer)",
- fexpr.GetSignatureForError ());
- }
- return true;
- }
- if (InstanceExpression is PropertyExpr || InstanceExpression is IndexerExpr || InstanceExpression is Invocation) {
- if (rc.CurrentInitializerVariable != null) {
- rc.Report.Error (1918, loc, "Members of value type `{0}' cannot be assigned using a property `{1}' object initializer",
- InstanceExpression.Type.GetSignatureForError (), InstanceExpression.GetSignatureForError ());
- } else {
- rc.Report.Error (1612, loc,
- "Cannot modify a value type return value of `{0}'. Consider storing the value in a temporary variable",
- InstanceExpression.GetSignatureForError ());
- }
- return true;
- }
- var lvr = InstanceExpression as LocalVariableReference;
- if (lvr != null) {
- if (!lvr.local_info.IsReadonly)
- return true;
- rc.Report.Error (1654, loc, "Cannot assign to members of `{0}' because it is a `{1}'",
- InstanceExpression.GetSignatureForError (), lvr.local_info.GetReadOnlyContext ());
- }
- }
- return true;
- }
- bool ResolveInstanceExpressionCore (ResolveContext rc, Expression rhs)
- {
- if (IsStatic) {
- if (InstanceExpression != null) {
- if (InstanceExpression is TypeExpr) {
- var t = InstanceExpression.Type;
- do {
- ObsoleteAttribute oa = t.GetAttributeObsolete ();
- if (oa != null && !rc.IsObsolete) {
- AttributeTester.Report_ObsoleteMessage (oa, t.GetSignatureForError (), loc, rc.Report);
- }
- t = t.DeclaringType;
- } while (t != null);
- } else {
- var runtime_expr = InstanceExpression as RuntimeValueExpression;
- if (runtime_expr == null || !runtime_expr.IsSuggestionOnly) {
- rc.Report.Error (176, loc,
- "Static member `{0}' cannot be accessed with an instance reference, qualify it with a type name instead",
- GetSignatureForError ());
- }
- }
- InstanceExpression = null;
- }
- return false;
- }
- if (InstanceExpression == null || InstanceExpression is TypeExpr) {
- if (InstanceExpression != null || !This.IsThisAvailable (rc, true)) {
- if (rc.HasSet (ResolveContext.Options.FieldInitializerScope)) {
- rc.Report.Error (236, loc,
- "A field initializer cannot reference the nonstatic field, method, or property `{0}'",
- GetSignatureForError ());
- } else {
- var fe = this as FieldExpr;
- if (fe != null && fe.Spec.MemberDefinition is PrimaryConstructorField) {
- if (rc.HasSet (ResolveContext.Options.BaseInitializer)) {
- rc.Report.Error (9005, loc, "Constructor initializer cannot access primary constructor parameters");
- } else {
- rc.Report.Error (9006, loc, "An object reference is required to access primary constructor parameter `{0}'",
- fe.Name);
- }
- } else {
- rc.Report.Error (120, loc,
- "An object reference is required to access non-static member `{0}'",
- GetSignatureForError ());
- }
- }
- InstanceExpression = new CompilerGeneratedThis (rc.CurrentType, loc).Resolve (rc);
- return false;
- }
- if (!TypeManager.IsFamilyAccessible (rc.CurrentType, DeclaringType)) {
- rc.Report.Error (38, loc,
- "Cannot access a nonstatic member of outer type `{0}' via nested type `{1}'",
- DeclaringType.GetSignatureForError (), rc.CurrentType.GetSignatureForError ());
- }
- InstanceExpression = new This (loc).Resolve (rc);
- return false;
- }
- var me = InstanceExpression as MemberExpr;
- if (me != null) {
- me.ResolveInstanceExpressionCore (rc, rhs);
- var fe = me as FieldExpr;
- if (fe != null && fe.IsMarshalByRefAccess (rc)) {
- rc.Report.SymbolRelatedToPreviousError (me.DeclaringType);
- rc.Report.Warning (1690, 1, loc,
- "Cannot call methods, properties, or indexers on `{0}' because it is a value type member of a marshal-by-reference class",
- me.GetSignatureForError ());
- }
- return true;
- }
- //
- // Additional checks for l-value member access
- //
- if (rhs != null) {
- if (InstanceExpression is UnboxCast) {
- rc.Report.Error (445, InstanceExpression.Location, "Cannot modify the result of an unboxing conversion");
- }
- }
- return true;
- }
- public virtual MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, SimpleName original)
- {
- if (left != null && !ConditionalAccess && left.IsNull && TypeSpec.IsReferenceType (left.Type)) {
- ec.Report.Warning (1720, 1, left.Location,
- "Expression will always cause a `{0}'", "System.NullReferenceException");
- }
- InstanceExpression = left;
- return this;
- }
- protected void EmitInstance (EmitContext ec, bool prepare_for_load)
- {
- var inst = new InstanceEmitter (InstanceExpression, TypeSpec.IsValueType (InstanceExpression.Type));
- inst.Emit (ec, ConditionalAccess);
- if (prepare_for_load)
- ec.Emit (OpCodes.Dup);
- }
- public abstract void SetTypeArguments (ResolveContext ec, TypeArguments ta);
- }
- public class ExtensionMethodCandidates
- {
- readonly NamespaceContainer container;
- readonly IList<MethodSpec> methods;
- readonly int index;
- readonly IMemberContext context;
- public ExtensionMethodCandidates (IMemberContext context, IList<MethodSpec> methods, NamespaceContainer nsContainer, int lookupIndex)
- {
- this.context = context;
- this.methods = methods;
- this.container = nsContainer;
- this.index = lookupIndex;
- }
- public NamespaceContainer Container {
- get {
- return container;
- }
- }
- public IMemberContext Context {
- get {
- return context;
- }
- }
- public int LookupIndex {
- get {
- return index;
- }
- }
- public IList<MethodSpec> Methods {
- get {
- return methods;
- }
- }
- }
- //
- // Represents a group of extension method candidates for whole namespace
- //
- class ExtensionMethodGroupExpr : MethodGroupExpr, OverloadResolver.IErrorHandler
- {
- ExtensionMethodCandidates candidates;
- public Expression ExtensionExpression;
- public ExtensionMethodGroupExpr (ExtensionMethodCandidates candidates, Expression extensionExpr, Location loc)
- : base (candidates.Methods.Cast<MemberSpec>().ToList (), extensionExpr.Type, loc)
- {
- this.candidates = candidates;
- this.ExtensionExpression = extensionExpr;
- }
- public override bool IsStatic {
- get { return true; }
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- if (ConditionalAccess) {
- fc.BranchConditionalAccessDefiniteAssignment ();
- }
- }
- //
- // For extension methodgroup we are not looking for base members but parent
- // namespace extension methods
- //
- public override IList<MemberSpec> GetBaseMembers (TypeSpec baseType)
- {
- // TODO: candidates are null only when doing error reporting, that's
- // incorrect. We have to discover same extension methods in error mode
- if (candidates == null)
- return null;
- int arity = type_arguments == null ? 0 : type_arguments.Count;
- candidates = candidates.Container.LookupExtensionMethod (candidates.Context, ExtensionExpression.Type, Name, arity, candidates.LookupIndex);
- if (candidates == null)
- return null;
- return candidates.Methods.Cast<MemberSpec> ().ToList ();
- }
- public override MethodGroupExpr LookupExtensionMethod (ResolveContext rc)
- {
- // We are already here
- return null;
- }
- public override MethodGroupExpr OverloadResolve (ResolveContext ec, ref Arguments arguments, OverloadResolver.IErrorHandler ehandler, OverloadResolver.Restrictions restr)
- {
- if (arguments == null)
- arguments = new Arguments (1);
- ExtensionExpression = ExtensionExpression.Resolve (ec);
- if (ExtensionExpression == null)
- return null;
- var cand = candidates;
- var atype = ConditionalAccess ? Argument.AType.ExtensionTypeConditionalAccess : Argument.AType.ExtensionType;
- arguments.Insert (0, new Argument (ExtensionExpression, atype));
- var res = base.OverloadResolve (ec, ref arguments, ehandler ?? this, restr);
-
- // Restore candidates in case we are running in probing mode
- candidates = cand;
- // Store resolved argument and restore original arguments
- if (res == null) {
- // Clean-up modified arguments for error reporting
- arguments.RemoveAt (0);
- return null;
- }
- var me = ExtensionExpression as MemberExpr;
- if (me != null) {
- me.ResolveInstanceExpression (ec, null);
- var fe = me as FieldExpr;
- if (fe != null)
- fe.Spec.MemberDefinition.SetIsUsed ();
- }
- InstanceExpression = null;
- return this;
- }
- #region IErrorHandler Members
- bool OverloadResolver.IErrorHandler.AmbiguousCandidates (ResolveContext rc, MemberSpec best, MemberSpec ambiguous)
- {
- return false;
- }
- bool OverloadResolver.IErrorHandler.ArgumentMismatch (ResolveContext rc, MemberSpec best, Argument arg, int index)
- {
- rc.Report.SymbolRelatedToPreviousError (best);
- rc.Report.Error (1928, loc,
- "Type `{0}' does not contain a member `{1}' and the best extension method overload `{2}' has some invalid arguments",
- queried_type.GetSignatureForError (), Name, best.GetSignatureForError ());
- if (index == 0) {
- rc.Report.Error (1929, loc,
- "Extension method instance type `{0}' cannot be converted to `{1}'",
- arg.Type.GetSignatureForError (), ((MethodSpec)best).Parameters.ExtensionMethodType.GetSignatureForError ());
- }
- return true;
- }
- bool OverloadResolver.IErrorHandler.NoArgumentMatch (ResolveContext rc, MemberSpec best)
- {
- return false;
- }
- bool OverloadResolver.IErrorHandler.TypeInferenceFailed (ResolveContext rc, MemberSpec best)
- {
- return false;
- }
- #endregion
- }
- /// <summary>
- /// MethodGroupExpr represents a group of method candidates which
- /// can be resolved to the best method overload
- /// </summary>
- public class MethodGroupExpr : MemberExpr, OverloadResolver.IBaseMembersProvider
- {
- static readonly MemberSpec[] Excluded = new MemberSpec[0];
- protected IList<MemberSpec> Methods;
- MethodSpec best_candidate;
- TypeSpec best_candidate_return;
- protected TypeArguments type_arguments;
- SimpleName simple_name;
- protected TypeSpec queried_type;
- public MethodGroupExpr (IList<MemberSpec> mi, TypeSpec type, Location loc)
- {
- Methods = mi;
- this.loc = loc;
- this.type = InternalType.MethodGroup;
- eclass = ExprClass.MethodGroup;
- queried_type = type;
- }
- public MethodGroupExpr (MethodSpec m, TypeSpec type, Location loc)
- : this (new MemberSpec[] { m }, type, loc)
- {
- }
- #region Properties
- public MethodSpec BestCandidate {
- get {
- return best_candidate;
- }
- }
- public TypeSpec BestCandidateReturnType {
- get {
- return best_candidate_return;
- }
- }
- public IList<MemberSpec> Candidates {
- get {
- return Methods;
- }
- }
- protected override TypeSpec DeclaringType {
- get {
- return queried_type;
- }
- }
- public bool IsConditionallyExcluded {
- get {
- return Methods == Excluded;
- }
- }
- public override bool IsInstance {
- get {
- if (best_candidate != null)
- return !best_candidate.IsStatic;
- return false;
- }
- }
- public override bool IsSideEffectFree {
- get {
- return InstanceExpression == null || InstanceExpression.IsSideEffectFree;
- }
- }
- public override bool IsStatic {
- get {
- if (best_candidate != null)
- return best_candidate.IsStatic;
- return false;
- }
- }
- public override string KindName {
- get { return "method"; }
- }
- public override string Name {
- get {
- if (best_candidate != null)
- return best_candidate.Name;
- // TODO: throw ?
- return Methods.First ().Name;
- }
- }
- #endregion
- //
- // When best candidate is already know this factory can be used
- // to avoid expensive overload resolution to be called
- //
- // NOTE: InstanceExpression has to be set manually
- //
- public static MethodGroupExpr CreatePredefined (MethodSpec best, TypeSpec queriedType, Location loc)
- {
- return new MethodGroupExpr (best, queriedType, loc) {
- best_candidate = best,
- best_candidate_return = best.ReturnType
- };
- }
- public override string GetSignatureForError ()
- {
- if (best_candidate != null)
- return best_candidate.GetSignatureForError ();
- return Methods.First ().GetSignatureForError ();
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- if (best_candidate == null) {
- ec.Report.Error (1953, loc, "An expression tree cannot contain an expression with method group");
- return null;
- }
- if (IsConditionallyExcluded)
- ec.Report.Error (765, loc,
- "Partial methods with only a defining declaration or removed conditional methods cannot be used in an expression tree");
- if (ConditionalAccess)
- Error_NullShortCircuitInsideExpressionTree (ec);
- return new TypeOfMethod (best_candidate, loc);
- }
-
- protected override Expression DoResolve (ResolveContext ec)
- {
- this.eclass = ExprClass.MethodGroup;
- if (InstanceExpression != null) {
- InstanceExpression = InstanceExpression.Resolve (ec);
- if (InstanceExpression == null)
- return null;
- }
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- throw new NotSupportedException ();
- }
- public void EmitCall (EmitContext ec, Arguments arguments, bool statement)
- {
- var call = new CallEmitter ();
- call.InstanceExpression = InstanceExpression;
- call.ConditionalAccess = ConditionalAccess;
- if (statement)
- call.EmitStatement (ec, best_candidate, arguments, loc);
- else
- call.Emit (ec, best_candidate, arguments, loc);
- }
- public void EmitCall (EmitContext ec, Arguments arguments, TypeSpec conditionalAccessReceiver, bool statement)
- {
- ec.ConditionalAccess = new ConditionalAccessContext (conditionalAccessReceiver, ec.DefineLabel ()) {
- Statement = statement
- };
- EmitCall (ec, arguments, statement);
- ec.CloseConditionalAccess (!statement && best_candidate_return != conditionalAccessReceiver && conditionalAccessReceiver.IsNullableType ? conditionalAccessReceiver : null);
- }
- public override void Error_ValueCannotBeConverted (ResolveContext ec, TypeSpec target, bool expl)
- {
- ec.Report.Error (428, loc, "Cannot convert method group `{0}' to non-delegate type `{1}'. Consider using parentheses to invoke the method",
- Name, target.GetSignatureForError ());
- }
- public static bool IsExtensionMethodArgument (Expression expr)
- {
- //
- // LAMESPEC: No details about which expressions are not allowed
- //
- return !(expr is TypeExpr) && !(expr is BaseThis);
- }
- /// <summary>
- /// Find the Applicable Function Members (7.4.2.1)
- ///
- /// me: Method Group expression with the members to select.
- /// it might contain constructors or methods (or anything
- /// that maps to a method).
- ///
- /// Arguments: ArrayList containing resolved Argument objects.
- ///
- /// loc: The location if we want an error to be reported, or a Null
- /// location for "probing" purposes.
- ///
- /// Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
- /// that is the best match of me on Arguments.
- ///
- /// </summary>
- public virtual MethodGroupExpr OverloadResolve (ResolveContext ec, ref Arguments args, OverloadResolver.IErrorHandler cerrors, OverloadResolver.Restrictions restr)
- {
- // TODO: causes issues with probing mode, remove explicit Kind check
- if (best_candidate != null && best_candidate.Kind == MemberKind.Destructor)
- return this;
- var r = new OverloadResolver (Methods, type_arguments, restr, loc);
- if ((restr & OverloadResolver.Restrictions.NoBaseMembers) == 0) {
- r.BaseMembersProvider = this;
- r.InstanceQualifier = this;
- }
- if (cerrors != null)
- r.CustomErrors = cerrors;
- // TODO: When in probing mode do IsApplicable only and when called again do VerifyArguments for full error reporting
- best_candidate = r.ResolveMember<MethodSpec> (ec, ref args);
- if (best_candidate == null) {
- if (!r.BestCandidateIsDynamic)
- return null;
- if (simple_name != null && ec.IsStatic)
- InstanceExpression = ProbeIdenticalTypeName (ec, InstanceExpression, simple_name);
- return this;
- }
- // Overload resolver had to create a new method group, all checks bellow have already been executed
- if (r.BestCandidateNewMethodGroup != null)
- return r.BestCandidateNewMethodGroup;
- if (best_candidate.Kind == MemberKind.Method && (restr & OverloadResolver.Restrictions.ProbingOnly) == 0) {
- if (InstanceExpression != null) {
- if (best_candidate.IsExtensionMethod && args[0].Expr == InstanceExpression) {
- InstanceExpression = null;
- } else {
- if (simple_name != null && best_candidate.IsStatic) {
- InstanceExpression = ProbeIdenticalTypeName (ec, InstanceExpression, simple_name);
- }
- InstanceExpression.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup | ResolveFlags.Type);
- }
- }
- ResolveInstanceExpression (ec, null);
- }
- var base_override = CandidateToBaseOverride (ec, best_candidate);
- if (base_override == best_candidate) {
- best_candidate_return = r.BestCandidateReturnType;
- } else {
- best_candidate = base_override;
- best_candidate_return = best_candidate.ReturnType;
- }
- if (best_candidate.IsGeneric && (restr & OverloadResolver.Restrictions.ProbingOnly) == 0 && TypeParameterSpec.HasAnyTypeParameterConstrained (best_candidate.GenericDefinition)) {
- ConstraintChecker cc = new ConstraintChecker (ec);
- cc.CheckAll (best_candidate.GetGenericMethodDefinition (), best_candidate.TypeArguments, best_candidate.Constraints, loc);
- }
- //
- // Additional check for possible imported base override method which
- // could not be done during IsOverrideMethodBaseTypeAccessible
- //
- if (best_candidate.IsVirtual && (best_candidate.DeclaringType.Modifiers & Modifiers.PROTECTED) != 0 &&
- best_candidate.MemberDefinition.IsImported && !best_candidate.DeclaringType.IsAccessible (ec)) {
- ec.Report.SymbolRelatedToPreviousError (best_candidate);
- ErrorIsInaccesible (ec, best_candidate.GetSignatureForError (), loc);
- }
- // Speed up the check by not doing it on disallowed targets
- if (best_candidate_return.Kind == MemberKind.Void && best_candidate.IsConditionallyExcluded (ec))
- Methods = Excluded;
- return this;
- }
- public override MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, SimpleName original)
- {
- var fe = left as FieldExpr;
- if (fe != null) {
- //
- // Using method-group on struct fields makes the struct assigned. I am not sure
- // why but that's what .net does
- //
- fe.Spec.MemberDefinition.SetIsAssigned ();
- }
- simple_name = original;
- return base.ResolveMemberAccess (ec, left, original);
- }
- public override void SetTypeArguments (ResolveContext ec, TypeArguments ta)
- {
- type_arguments = ta;
- }
- #region IBaseMembersProvider Members
- public virtual IList<MemberSpec> GetBaseMembers (TypeSpec baseType)
- {
- return baseType == null ? null : MemberCache.FindMembers (baseType, Methods [0].Name, false);
- }
- public IParametersMember GetOverrideMemberParameters (MemberSpec member)
- {
- if (queried_type == member.DeclaringType)
- return null;
- return MemberCache.FindMember (queried_type, new MemberFilter ((MethodSpec) member),
- BindingRestriction.InstanceOnly | BindingRestriction.OverrideOnly) as IParametersMember;
- }
- //
- // Extension methods lookup after ordinary methods candidates failed to apply
- //
- public virtual MethodGroupExpr LookupExtensionMethod (ResolveContext rc)
- {
- if (InstanceExpression == null || InstanceExpression.eclass == ExprClass.Type)
- return null;
- if (!IsExtensionMethodArgument (InstanceExpression))
- return null;
- int arity = type_arguments == null ? 0 : type_arguments.Count;
- var methods = rc.LookupExtensionMethod (InstanceExpression.Type, Methods[0].Name, arity);
- if (methods == null)
- return null;
- var emg = new ExtensionMethodGroupExpr (methods, InstanceExpression, loc);
- emg.SetTypeArguments (rc, type_arguments);
- return emg;
- }
- #endregion
- }
- struct ConstructorInstanceQualifier : OverloadResolver.IInstanceQualifier
- {
- public ConstructorInstanceQualifier (TypeSpec type)
- : this ()
- {
- InstanceType = type;
- }
- public TypeSpec InstanceType { get; private set; }
- public bool CheckProtectedMemberAccess (ResolveContext rc, MemberSpec member)
- {
- return MemberExpr.CheckProtectedMemberAccess (rc, member, InstanceType);
- }
- }
- public struct OverloadResolver
- {
- [Flags]
- public enum Restrictions
- {
- None = 0,
- DelegateInvoke = 1,
- ProbingOnly = 1 << 1,
- CovariantDelegate = 1 << 2,
- NoBaseMembers = 1 << 3,
- BaseMembersIncluded = 1 << 4,
- GetEnumeratorLookup = 1 << 5
- }
- public interface IBaseMembersProvider
- {
- IList<MemberSpec> GetBaseMembers (TypeSpec baseType);
- IParametersMember GetOverrideMemberParameters (MemberSpec member);
- MethodGroupExpr LookupExtensionMethod (ResolveContext rc);
- }
- public interface IErrorHandler
- {
- bool AmbiguousCandidates (ResolveContext rc, MemberSpec best, MemberSpec ambiguous);
- bool ArgumentMismatch (ResolveContext rc, MemberSpec best, Argument a, int index);
- bool NoArgumentMatch (ResolveContext rc, MemberSpec best);
- bool TypeInferenceFailed (ResolveContext rc, MemberSpec best);
- }
- public interface IInstanceQualifier
- {
- TypeSpec InstanceType { get; }
- bool CheckProtectedMemberAccess (ResolveContext rc, MemberSpec member);
- }
- sealed class NoBaseMembers : IBaseMembersProvider
- {
- public static readonly IBaseMembersProvider Instance = new NoBaseMembers ();
- public IList<MemberSpec> GetBaseMembers (TypeSpec baseType)
- {
- return null;
- }
- public IParametersMember GetOverrideMemberParameters (MemberSpec member)
- {
- return null;
- }
- public MethodGroupExpr LookupExtensionMethod (ResolveContext rc)
- {
- return null;
- }
- }
- struct AmbiguousCandidate
- {
- public readonly MemberSpec Member;
- public readonly bool Expanded;
- public readonly AParametersCollection Parameters;
- public AmbiguousCandidate (MemberSpec member, AParametersCollection parameters, bool expanded)
- {
- Member = member;
- Parameters = parameters;
- Expanded = expanded;
- }
- }
- Location loc;
- IList<MemberSpec> members;
- TypeArguments type_arguments;
- IBaseMembersProvider base_provider;
- IErrorHandler custom_errors;
- IInstanceQualifier instance_qualifier;
- Restrictions restrictions;
- MethodGroupExpr best_candidate_extension_group;
- TypeSpec best_candidate_return_type;
- SessionReportPrinter lambda_conv_msgs;
- public OverloadResolver (IList<MemberSpec> members, Restrictions restrictions, Location loc)
- : this (members, null, restrictions, loc)
- {
- }
- public OverloadResolver (IList<MemberSpec> members, TypeArguments targs, Restrictions restrictions, Location loc)
- : this ()
- {
- if (members == null || members.Count == 0)
- throw new ArgumentException ("empty members set");
- this.members = members;
- this.loc = loc;
- type_arguments = targs;
- this.restrictions = restrictions;
- if (IsDelegateInvoke)
- this.restrictions |= Restrictions.NoBaseMembers;
- base_provider = NoBaseMembers.Instance;
- }
- #region Properties
- public IBaseMembersProvider BaseMembersProvider {
- get {
- return base_provider;
- }
- set {
- base_provider = value;
- }
- }
- public bool BestCandidateIsDynamic { get; set; }
- //
- // Best candidate was found in newly created MethodGroupExpr, used by extension methods
- //
- public MethodGroupExpr BestCandidateNewMethodGroup {
- get {
- return best_candidate_extension_group;
- }
- }
- //
- // Return type can be different between best candidate and closest override
- //
- public TypeSpec BestCandidateReturnType {
- get {
- return best_candidate_return_type;
- }
- }
- public IErrorHandler CustomErrors {
- get {
- return custom_errors;
- }
- set {
- custom_errors = value;
- }
- }
- TypeSpec DelegateType {
- get {
- if ((restrictions & Restrictions.DelegateInvoke) == 0)
- throw new InternalErrorException ("Not running in delegate mode", loc);
- return members [0].DeclaringType;
- }
- }
- public IInstanceQualifier InstanceQualifier {
- get {
- return instance_qualifier;
- }
- set {
- instance_qualifier = value;
- }
- }
- bool IsProbingOnly {
- get {
- return (restrictions & Restrictions.ProbingOnly) != 0;
- }
- }
- bool IsDelegateInvoke {
- get {
- return (restrictions & Restrictions.DelegateInvoke) != 0;
- }
- }
- #endregion
- //
- // 7.4.3.3 Better conversion from expression
- // Returns : 1 if a->p is better,
- // 2 if a->q is better,
- // 0 if neither is better
- //
- static int BetterExpressionConversion (ResolveContext ec, Argument a, TypeSpec p, TypeSpec q)
- {
- TypeSpec argument_type = a.Type;
- //
- // If argument is an anonymous function
- //
- if (argument_type == InternalType.AnonymousMethod && ec.Module.Compiler.Settings.Version > LanguageVersion.ISO_2) {
- //
- // p and q are delegate types or expression tree types
- //
- if (p.IsExpressionTreeType || q.IsExpressionTreeType) {
- if (q.MemberDefinition != p.MemberDefinition) {
- return 0;
- }
- //
- // Uwrap delegate from Expression<T>
- //
- q = TypeManager.GetTypeArguments (q)[0];
- p = TypeManager.GetTypeArguments (p)[0];
- }
- var p_m = Delegate.GetInvokeMethod (p);
- var q_m = Delegate.GetInvokeMethod (q);
- //
- // With identical parameter lists
- //
- if (!TypeSpecComparer.Equals (p_m.Parameters.Types, q_m.Parameters.Types))
- return 0;
- p = p_m.ReturnType;
- var orig_q = q;
- q = q_m.ReturnType;
- //
- // if p is void returning, and q has a return type Y, then C2 is the better conversion.
- //
- if (p.Kind == MemberKind.Void) {
- return q.Kind != MemberKind.Void ? 2 : 0;
- }
- //
- // if p has a return type Y, and q is void returning, then C1 is the better conversion.
- //
- if (q.Kind == MemberKind.Void) {
- return p.Kind != MemberKind.Void ? 1: 0;
- }
- var am = (AnonymousMethodExpression) a.Expr;
- //
- // When anonymous method is an asynchronous, and P has a return type Task<Y1>, and Q has a return type Task<Y2>
- // better conversion is performed between underlying types Y1 and Y2
- //
- if (p.IsGenericTask || q.IsGenericTask) {
- if (am.Block.IsAsync && p.IsGenericTask && q.IsGenericTask) {
- q = q.TypeArguments[0];
- p = p.TypeArguments[0];
- }
- }
- if (q != p) {
- //
- // An inferred return type X exists for E in the context of that parameter list, and
- // the conversion from X to Y1 is better than the conversion from X to Y2
- //
- argument_type = am.InferReturnType (ec, null, orig_q);
- if (argument_type == null) {
- // TODO: Can this be hit?
- return 1;
- }
- if (argument_type.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
- argument_type = ec.BuiltinTypes.Object;
- }
- }
- if (argument_type == p)
- return 1;
- if (argument_type == q)
- return 2;
- //
- // The parameters are identicial and return type is not void, use better type conversion
- // on return type to determine better one
- //
- return BetterTypeConversion (ec, p, q);
- }
- //
- // 7.4.3.4 Better conversion from type
- //
- public static int BetterTypeConversion (ResolveContext ec, TypeSpec p, TypeSpec q)
- {
- if (p == null || q == null)
- throw new InternalErrorException ("BetterTypeConversion got a null conversion");
- switch (p.BuiltinType) {
- case BuiltinTypeSpec.Type.Int:
- if (q.BuiltinType == BuiltinTypeSpec.Type.UInt || q.BuiltinType == BuiltinTypeSpec.Type.ULong)
- return 1;
- break;
- case BuiltinTypeSpec.Type.Long:
- if (q.BuiltinType == BuiltinTypeSpec.Type.ULong)
- return 1;
- break;
- case BuiltinTypeSpec.Type.SByte:
- switch (q.BuiltinType) {
- case BuiltinTypeSpec.Type.Byte:
- case BuiltinTypeSpec.Type.UShort:
- case BuiltinTypeSpec.Type.UInt:
- case BuiltinTypeSpec.Type.ULong:
- return 1;
- }
- break;
- case BuiltinTypeSpec.Type.Short:
- switch (q.BuiltinType) {
- case BuiltinTypeSpec.Type.UShort:
- case BuiltinTypeSpec.Type.UInt:
- case BuiltinTypeSpec.Type.ULong:
- return 1;
- }
- break;
- case BuiltinTypeSpec.Type.Dynamic:
- // Dynamic is never better
- return 2;
- }
- switch (q.BuiltinType) {
- case BuiltinTypeSpec.Type.Int:
- if (p.BuiltinType == BuiltinTypeSpec.Type.UInt || p.BuiltinType == BuiltinTypeSpec.Type.ULong)
- return 2;
- break;
- case BuiltinTypeSpec.Type.Long:
- if (p.BuiltinType == BuiltinTypeSpec.Type.ULong)
- return 2;
- break;
- case BuiltinTypeSpec.Type.SByte:
- switch (p.BuiltinType) {
- case BuiltinTypeSpec.Type.Byte:
- case BuiltinTypeSpec.Type.UShort:
- case BuiltinTypeSpec.Type.UInt:
- case BuiltinTypeSpec.Type.ULong:
- return 2;
- }
- break;
- case BuiltinTypeSpec.Type.Short:
- switch (p.BuiltinType) {
- case BuiltinTypeSpec.Type.UShort:
- case BuiltinTypeSpec.Type.UInt:
- case BuiltinTypeSpec.Type.ULong:
- return 2;
- }
- break;
- case BuiltinTypeSpec.Type.Dynamic:
- // Dynamic is never better
- return 1;
- }
- // FIXME: handle lifted operators
- // TODO: this is expensive
- Expression p_tmp = new EmptyExpression (p);
- Expression q_tmp = new EmptyExpression (q);
- bool p_to_q = Convert.ImplicitConversionExists (ec, p_tmp, q);
- bool q_to_p = Convert.ImplicitConversionExists (ec, q_tmp, p);
- if (p_to_q && !q_to_p)
- return 1;
- if (q_to_p && !p_to_q)
- return 2;
- return 0;
- }
- /// <summary>
- /// Determines "Better function" between candidate
- /// and the current best match
- /// </summary>
- /// <remarks>
- /// Returns a boolean indicating :
- /// false if candidate ain't better
- /// true if candidate is better than the current best match
- /// </remarks>
- static bool BetterFunction (ResolveContext ec, Arguments args, MemberSpec candidate, AParametersCollection cparam, bool candidate_params,
- MemberSpec best, AParametersCollection bparam, bool best_params)
- {
- AParametersCollection candidate_pd = ((IParametersMember) candidate).Parameters;
- AParametersCollection best_pd = ((IParametersMember) best).Parameters;
- bool better_at_least_one = false;
- bool are_equivalent = true;
- int args_count = args == null ? 0 : args.Count;
- int j = 0;
- Argument a = null;
- TypeSpec ct, bt;
- for (int c_idx = 0, b_idx = 0; j < args_count; ++j, ++c_idx, ++b_idx) {
- a = args[j];
- // Default arguments are ignored for better decision
- if (a.IsDefaultArgument)
- break;
- //
- // When comparing named argument the parameter type index has to be looked up
- // in original parameter set (override version for virtual members)
- //
- NamedArgument na = a as NamedArgument;
- if (na != null) {
- int idx = cparam.GetParameterIndexByName (na.Name);
- ct = candidate_pd.Types[idx];
- if (candidate_params && candidate_pd.FixedParameters[idx].ModFlags == Parameter.Modifier.PARAMS)
- ct = TypeManager.GetElementType (ct);
- idx = bparam.GetParameterIndexByName (na.Name);
- bt = best_pd.Types[idx];
- if (best_params && best_pd.FixedParameters[idx].ModFlags == Parameter.Modifier.PARAMS)
- bt = TypeManager.GetElementType (bt);
- } else {
- ct = candidate_pd.Types[c_idx];
- bt = best_pd.Types[b_idx];
- if (candidate_params && candidate_pd.FixedParameters[c_idx].ModFlags == Parameter.Modifier.PARAMS) {
- ct = TypeManager.GetElementType (ct);
- --c_idx;
- }
- if (best_params && best_pd.FixedParameters[b_idx].ModFlags == Parameter.Modifier.PARAMS) {
- bt = TypeManager.GetElementType (bt);
- --b_idx;
- }
- }
- if (TypeSpecComparer.IsEqual (ct, bt))
- continue;
- are_equivalent = false;
- int result = BetterExpressionConversion (ec, a, ct, bt);
- // for each argument, the conversion to 'ct' should be no worse than
- // the conversion to 'bt'.
- if (result == 2)
- return false;
- // for at least one argument, the conversion to 'ct' should be better than
- // the conversion to 'bt'.
- if (result != 0)
- better_at_least_one = true;
- }
- if (better_at_least_one)
- return true;
- //
- // Tie-breaking rules are applied only for equivalent parameter types
- //
- if (!are_equivalent)
- return false;
- //
- // If candidate is applicable in its normal form and best has a params array and is applicable
- // only in its expanded form, then candidate is better
- //
- if (candidate_params != best_params)
- return !candidate_params;
- //
- // We have not reached end of parameters list due to params or used default parameters
- //
- while (j < candidate_pd.Count && j < best_pd.Count) {
- var cand_param = candidate_pd.FixedParameters [j];
- var best_param = best_pd.FixedParameters [j];
- if (candidate_pd.Count == best_pd.Count) {
- //
- // LAMESPEC:
- //
- // void Foo (int i = 0) is better than void Foo (params int[]) for Foo ()
- // void Foo (string[] s, string value = null) is better than Foo (string s, params string[]) for Foo (null) or Foo ()
- //
- if (cand_param.HasDefaultValue != best_param.HasDefaultValue)
- return cand_param.HasDefaultValue;
- if (cand_param.HasDefaultValue) {
- ++j;
- continue;
- }
- } else {
- //
- // Neither is better when not all arguments are provided
- //
- // void Foo (string s, int i = 0) <-> Foo (string s, int i = 0, int i2 = 0)
- // void Foo (string s, int i = 0) <-> Foo (string s, byte i = 0)
- // void Foo (string s, params int[]) <-> Foo (string s, params byte[])
- //
- if (cand_param.HasDefaultValue && best_param.HasDefaultValue)
- return false;
- }
- break;
- }
- if (candidate_pd.Count != best_pd.Count)
- return candidate_pd.Count < best_pd.Count;
- //
- // One is a non-generic method and second is a generic method, then non-generic is better
- //
- if (best.IsGeneric != candidate.IsGeneric)
- return best.IsGeneric;
- //
- // Both methods have the same number of parameters, and the parameters have equal types
- // Pick the "more specific" signature using rules over original (non-inflated) types
- //
- var candidate_def_pd = ((IParametersMember) candidate.MemberDefinition).Parameters;
- var best_def_pd = ((IParametersMember) best.MemberDefinition).Parameters;
- bool specific_at_least_once = false;
- for (j = 0; j < args_count; ++j) {
- NamedArgument na = args_count == 0 ? null : args [j] as NamedArgument;
- if (na != null) {
- ct = candidate_def_pd.Types[cparam.GetParameterIndexByName (na.Name)];
- bt = best_def_pd.Types[bparam.GetParameterIndexByName (na.Name)];
- } else {
- ct = candidate_def_pd.Types[j];
- bt = best_def_pd.Types[j];
- }
- if (ct == bt)
- continue;
- TypeSpec specific = MoreSpecific (ct, bt);
- if (specific == bt)
- return false;
- if (specific == ct)
- specific_at_least_once = true;
- }
- if (specific_at_least_once)
- return true;
- return false;
- }
- static bool CheckInflatedArguments (MethodSpec ms)
- {
- if (!TypeParameterSpec.HasAnyTypeParameterTypeConstrained (ms.GenericDefinition))
- return true;
- // Setup constraint checker for probing only
- ConstraintChecker cc = new ConstraintChecker (null);
- var mp = ms.Parameters.Types;
- for (int i = 0; i < mp.Length; ++i) {
- var type = mp[i] as InflatedTypeSpec;
- if (type == null)
- continue;
- var targs = type.TypeArguments;
- if (targs.Length == 0)
- continue;
- // TODO: Checking inflated MVAR arguments should be enough
- if (!cc.CheckAll (type.GetDefinition (), targs, type.Constraints, Location.Null))
- return false;
- }
- return true;
- }
- public static void Error_ConstructorMismatch (ResolveContext rc, TypeSpec type, int argCount, Location loc)
- {
- rc.Report.Error (1729, loc,
- "The type `{0}' does not contain a constructor that takes `{1}' arguments",
- type.GetSignatureForError (), argCount.ToString ());
- }
- //
- // Determines if the candidate method is applicable to the given set of arguments
- // There could be two different set of parameters for same candidate where one
- // is the closest override for default values and named arguments checks and second
- // one being the virtual base for the parameter types and modifiers.
- //
- // A return value rates candidate method compatibility,
- // 0 = the best, int.MaxValue = the worst
- // -1 = fatal error
- //
- int IsApplicable (ResolveContext ec, ref Arguments arguments, int arg_count, ref MemberSpec candidate, IParametersMember pm, ref bool params_expanded_form, ref bool dynamicArgument, ref TypeSpec returnType, bool errorMode)
- {
- // Parameters of most-derived type used mainly for named and optional parameters
- var pd = pm.Parameters;
- // Used for params modifier only, that's legacy of C# 1.0 which uses base type for
- // params modifier instead of most-derived type
- var cpd = ((IParametersMember) candidate).Parameters;
- int param_count = pd.Count;
- int optional_count = 0;
- int score;
- Arguments orig_args = arguments;
- if (arg_count != param_count) {
- //
- // No arguments expansion when doing exact match for delegates
- //
- if ((restrictions & Restrictions.CovariantDelegate) == 0) {
- for (int i = 0; i < pd.Count; ++i) {
- if (pd.FixedParameters[i].HasDefaultValue) {
- optional_count = pd.Count - i;
- break;
- }
- }
- }
- if (optional_count != 0) {
- // Readjust expected number when params used
- if (cpd.HasParams) {
- optional_count--;
- if (arg_count < param_count)
- param_count--;
- } else if (arg_count > param_count) {
- int args_gap = System.Math.Abs (arg_count - param_count);
- return int.MaxValue - 10000 + args_gap;
- } else if (arg_count < param_count - optional_count) {
- int args_gap = System.Math.Abs (param_count - optional_count - arg_count);
- return int.MaxValue - 10000 + args_gap;
- }
- } else if (arg_count != param_count) {
- int args_gap = System.Math.Abs (arg_count - param_count);
- if (!cpd.HasParams)
- return int.MaxValue - 10000 + args_gap;
- if (arg_count < param_count - 1)
- return int.MaxValue - 10000 + args_gap;
- }
- // Resize to fit optional arguments
- if (optional_count != 0) {
- if (arguments == null) {
- arguments = new Arguments (optional_count);
- } else {
- // Have to create a new container, so the next run can do same
- var resized = new Arguments (param_count);
- resized.AddRange (arguments);
- arguments = resized;
- }
- for (int i = arg_count; i < param_count; ++i)
- arguments.Add (null);
- }
- }
- if (arg_count > 0) {
- //
- // Shuffle named arguments to the right positions if there are any
- //
- if (arguments[arg_count - 1] is NamedArgument) {
- arg_count = arguments.Count;
- for (int i = 0; i < arg_count; ++i) {
- bool arg_moved = false;
- while (true) {
- NamedArgument na = arguments[i] as NamedArgument;
- if (na == null)
- break;
- int index = pd.GetParameterIndexByName (na.Name);
- // Named parameter not found
- if (index < 0)
- return (i + 1) * 3;
- // already reordered
- if (index == i)
- break;
- Argument temp;
- if (index >= param_count) {
- // When using parameters which should not be available to the user
- if ((cpd.FixedParameters[index].ModFlags & Parameter.Modifier.PARAMS) == 0)
- break;
- arguments.Add (null);
- ++arg_count;
- temp = null;
- } else {
- if (index == arg_count)
- return (i + 1) * 3;
- temp = arguments [index];
- // The slot has been taken by positional argument
- if (temp != null && !(temp is NamedArgument))
- break;
- }
- if (!arg_moved) {
- arguments = arguments.MarkOrderedArgument (na);
- arg_moved = true;
- }
- if (arguments == orig_args) {
- arguments = new Arguments (orig_args.Count);
- arguments.AddRange (orig_args);
- }
- arguments[index] = arguments[i];
- arguments[i] = temp;
- if (temp == null)
- break;
- }
- }
- } else {
- arg_count = arguments.Count;
- }
- } else if (arguments != null) {
- arg_count = arguments.Count;
- }
- //
- // Don't do any expensive checks when the candidate cannot succeed
- //
- if (arg_count != param_count && !cpd.HasParams)
- return (param_count - arg_count) * 2 + 1;
- var dep = candidate.GetMissingDependencies ();
- if (dep != null) {
- ImportedTypeDefinition.Error_MissingDependency (ec, dep, loc);
- return -1;
- }
- //
- // 1. Handle generic method using type arguments when specified or type inference
- //
- TypeSpec[] ptypes;
- var ms = candidate as MethodSpec;
- if (ms != null && ms.IsGeneric) {
- if (type_arguments != null) {
- var g_args_count = ms.Arity;
- if (g_args_count != type_arguments.Count)
- return int.MaxValue - 20000 + System.Math.Abs (type_arguments.Count - g_args_count);
- if (type_arguments.Arguments != null)
- ms = ms.MakeGenericMethod (ec, type_arguments.Arguments);
- } else {
- //
- // Deploy custom error reporting for infered anonymous expression or lambda methods. When
- // probing lambda methods keep all errors reported in separate set and once we are done and no best
- // candidate was found use the set to report more details about what was wrong with lambda body.
- // The general idea is to distinguish between code errors and errors caused by
- // trial-and-error type inference
- //
- if (lambda_conv_msgs == null) {
- for (int i = 0; i < arg_count; i++) {
- Argument a = arguments[i];
- if (a == null)
- continue;
- var am = a.Expr as AnonymousMethodExpression;
- if (am != null) {
- if (lambda_conv_msgs == null)
- lambda_conv_msgs = new SessionReportPrinter ();
- am.TypeInferenceReportPrinter = lambda_conv_msgs;
- }
- }
- }
- var ti = new TypeInference (arguments);
- TypeSpec[] i_args = ti.InferMethodArguments (ec, ms);
- if (i_args == null)
- return ti.InferenceScore - 20000;
- //
- // Clear any error messages when the result was success
- //
- if (lambda_conv_msgs != null)
- lambda_conv_msgs.ClearSession ();
- if (i_args.Length != 0) {
- if (!errorMode) {
- foreach (var ta in i_args) {
- if (!ta.IsAccessible (ec))
- return ti.InferenceScore - 10000;
- }
- }
- ms = ms.MakeGenericMethod (ec, i_args);
- }
- }
- //
- // Type arguments constraints have to match for the method to be applicable
- //
- if (!CheckInflatedArguments (ms)) {
- candidate = ms;
- return int.MaxValue - 25000;
- }
- //
- // We have a generic return type and at same time the method is override which
- // means we have to also inflate override return type in case the candidate is
- // best candidate and override return type is different to base return type.
- //
- // virtual Foo<T, object> with override Foo<T, dynamic>
- //
- if (candidate != pm) {
- MethodSpec override_ms = (MethodSpec) pm;
- var inflator = new TypeParameterInflator (ec, ms.DeclaringType, override_ms.GenericDefinition.TypeParameters, ms.TypeArguments);
- returnType = inflator.Inflate (returnType);
- } else {
- returnType = ms.ReturnType;
- }
- candidate = ms;
- pd = ms.Parameters;
- ptypes = pd.Types;
- } else {
- if (type_arguments != null)
- return int.MaxValue - 15000;
- ptypes = cpd.Types;
- }
- //
- // 2. Each argument has to be implicitly convertible to method parameter
- //
- Parameter.Modifier p_mod = 0;
- TypeSpec pt = null;
- for (int i = 0; i < arg_count; i++) {
- Argument a = arguments[i];
- if (a == null) {
- var fp = pd.FixedParameters[i];
- if (!fp.HasDefaultValue) {
- arguments = orig_args;
- return arg_count * 2 + 2;
- }
- //
- // Get the default value expression, we can use the same expression
- // if the type matches
- //
- Expression e = fp.DefaultValue;
- if (e != null) {
- e = ResolveDefaultValueArgument (ec, ptypes[i], e, loc);
- if (e == null) {
- // Restore for possible error reporting
- for (int ii = i; ii < arg_count; ++ii)
- arguments.RemoveAt (i);
- return (arg_count - i) * 2 + 1;
- }
- }
- if ((fp.ModFlags & Parameter.Modifier.CallerMask) != 0) {
- //
- // LAMESPEC: Attributes can be mixed together with build-in priority
- //
- if ((fp.ModFlags & Parameter.Modifier.CallerLineNumber) != 0) {
- e = new IntLiteral (ec.BuiltinTypes, loc.Row, loc);
- } else if ((fp.ModFlags & Parameter.Modifier.CallerFilePath) != 0) {
- e = new StringLiteral (ec.BuiltinTypes, loc.NameFullPath, loc);
- } else if (ec.MemberContext.CurrentMemberDefinition != null) {
- e = new StringLiteral (ec.BuiltinTypes, ec.MemberContext.CurrentMemberDefinition.GetCallerMemberName (), loc);
- }
- }
- arguments[i] = new Argument (e, Argument.AType.Default);
- continue;
- }
- if (p_mod != Parameter.Modifier.PARAMS) {
- p_mod = (pd.FixedParameters[i].ModFlags & ~Parameter.Modifier.PARAMS) | (cpd.FixedParameters[i].ModFlags & Parameter.Modifier.PARAMS);
- pt = ptypes [i];
- } else if (!params_expanded_form) {
- params_expanded_form = true;
- pt = ((ElementTypeSpec) pt).Element;
- i -= 2;
- continue;
- }
- score = 1;
- if (!params_expanded_form) {
- if (a.IsExtensionType) {
- //
- // Indentity, implicit reference or boxing conversion must exist for the extension parameter
- //
- // LAMESPEC: or implicit type parameter conversion
- //
- var at = a.Type;
- if (at == pt || TypeSpecComparer.IsEqual (at, pt) ||
- Convert.ImplicitReferenceConversionExists (at, pt, false) ||
- Convert.ImplicitBoxingConversion (null, at, pt) != null) {
- score = 0;
- continue;
- }
- } else {
- score = IsArgumentCompatible (ec, a, p_mod, pt);
- if (score < 0)
- dynamicArgument = true;
- }
- }
- //
- // It can be applicable in expanded form (when not doing exact match like for delegates)
- //
- if (score != 0 && (p_mod & Parameter.Modifier.PARAMS) != 0 && (restrictions & Restrictions.CovariantDelegate) == 0) {
- if (!params_expanded_form) {
- pt = ((ElementTypeSpec) pt).Element;
- }
- if (score > 0)
- score = IsArgumentCompatible (ec, a, Parameter.Modifier.NONE, pt);
- if (score < 0) {
- params_expanded_form = true;
- dynamicArgument = true;
- } else if (score == 0 || arg_count > pd.Count) {
- params_expanded_form = true;
- }
- }
- if (score > 0) {
- if (params_expanded_form)
- ++score;
- return (arg_count - i) * 2 + score;
- }
- }
- //
- // Restore original arguments for dynamic binder to keep the intention of original source code
- //
- if (dynamicArgument)
- arguments = orig_args;
- return 0;
- }
- public static Expression ResolveDefaultValueArgument (ResolveContext ec, TypeSpec ptype, Expression e, Location loc)
- {
- if (e is Constant && e.Type == ptype)
- return e;
- //
- // LAMESPEC: No idea what the exact rules are for System.Reflection.Missing.Value instead of null
- //
- if (e == EmptyExpression.MissingValue && ptype.BuiltinType == BuiltinTypeSpec.Type.Object || ptype.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
- e = new MemberAccess (new MemberAccess (new MemberAccess (
- new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Reflection", loc), "Missing", loc), "Value", loc);
- } else if (e is Constant) {
- //
- // Handles int to int? conversions, DefaultParameterValue check
- //
- e = Convert.ImplicitConversionStandard (ec, e, ptype, loc);
- if (e == null)
- return null;
- } else {
- e = new DefaultValueExpression (new TypeExpression (ptype, loc), loc);
- }
- return e.Resolve (ec);
- }
- //
- // Tests argument compatibility with the parameter
- // The possible return values are
- // 0 - success
- // 1 - modifier mismatch
- // 2 - type mismatch
- // -1 - dynamic binding required
- //
- int IsArgumentCompatible (ResolveContext ec, Argument argument, Parameter.Modifier param_mod, TypeSpec parameter)
- {
- //
- // Types have to be identical when ref or out modifer
- // is used and argument is not of dynamic type
- //
- if (((argument.Modifier | param_mod) & Parameter.Modifier.RefOutMask) != 0) {
- if (argument.Type != parameter) {
- //
- // Do full equality check after quick path
- //
- if (!TypeSpecComparer.IsEqual (argument.Type, parameter)) {
- //
- // Using dynamic for ref/out parameter can still succeed at runtime
- //
- if (argument.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic && (argument.Modifier & Parameter.Modifier.RefOutMask) == 0 && (restrictions & Restrictions.CovariantDelegate) == 0)
- return -1;
- return 2;
- }
- }
- if ((argument.Modifier & Parameter.Modifier.RefOutMask) != (param_mod & Parameter.Modifier.RefOutMask)) {
- //
- // Using dynamic for ref/out parameter can still succeed at runtime
- //
- if (argument.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic && (argument.Modifier & Parameter.Modifier.RefOutMask) == 0 && (restrictions & Restrictions.CovariantDelegate) == 0)
- return -1;
- return 1;
- }
- } else {
- if (argument.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic && (restrictions & Restrictions.CovariantDelegate) == 0)
- return -1;
- //
- // Use implicit conversion in all modes to return same candidates when the expression
- // is used as argument or delegate conversion
- //
- if (!Convert.ImplicitConversionExists (ec, argument.Expr, parameter)) {
- return parameter.IsDelegate && argument.Expr is AnonymousMethodExpression ? 2 : 3;
- }
- }
- return 0;
- }
- static TypeSpec MoreSpecific (TypeSpec p, TypeSpec q)
- {
- if (TypeManager.IsGenericParameter (p) && !TypeManager.IsGenericParameter (q))
- return q;
- if (!TypeManager.IsGenericParameter (p) && TypeManager.IsGenericParameter (q))
- return p;
- var ac_p = p as ArrayContainer;
- if (ac_p != null) {
- var ac_q = q as ArrayContainer;
- if (ac_q == null)
- return null;
- TypeSpec specific = MoreSpecific (ac_p.Element, ac_q.Element);
- if (specific == ac_p.Element)
- return p;
- if (specific == ac_q.Element)
- return q;
- } else if (p.IsGeneric && q.IsGeneric) {
- var pargs = TypeManager.GetTypeArguments (p);
- var qargs = TypeManager.GetTypeArguments (q);
- bool p_specific_at_least_once = false;
- bool q_specific_at_least_once = false;
- for (int i = 0; i < pargs.Length; i++) {
- TypeSpec specific = MoreSpecific (pargs[i], qargs[i]);
- if (specific == pargs[i])
- p_specific_at_least_once = true;
- if (specific == qargs[i])
- q_specific_at_least_once = true;
- }
- if (p_specific_at_least_once && !q_specific_at_least_once)
- return p;
- if (!p_specific_at_least_once && q_specific_at_least_once)
- return q;
- }
- return null;
- }
- //
- // Find the best method from candidate list
- //
- public T ResolveMember<T> (ResolveContext rc, ref Arguments args) where T : MemberSpec, IParametersMember
- {
- List<AmbiguousCandidate> ambiguous_candidates = null;
- MemberSpec best_candidate;
- Arguments best_candidate_args = null;
- bool best_candidate_params = false;
- bool best_candidate_dynamic = false;
- int best_candidate_rate;
- IParametersMember best_parameter_member = null;
- int args_count = args != null ? args.Count : 0;
- Arguments candidate_args = args;
- bool error_mode = false;
- MemberSpec invocable_member = null;
- while (true) {
- best_candidate = null;
- best_candidate_rate = int.MaxValue;
- var type_members = members;
- do {
- for (int i = 0; i < type_members.Count; ++i) {
- var member = type_members[i];
- //
- // Methods in a base class are not candidates if any method in a derived
- // class is applicable
- //
- if ((member.Modifiers & Modifiers.OVERRIDE) != 0)
- continue;
- if (!error_mode) {
- if (!member.IsAccessible (rc))
- continue;
- if (rc.IsRuntimeBinder && !member.DeclaringType.IsAccessible (rc))
- continue;
- if ((member.Modifiers & (Modifiers.PROTECTED | Modifiers.STATIC)) == Modifiers.PROTECTED &&
- instance_qualifier != null && !instance_qualifier.CheckProtectedMemberAccess (rc, member)) {
- continue;
- }
- }
- IParametersMember pm = member as IParametersMember;
- if (pm == null) {
- //
- // Will use it later to report ambiguity between best method and invocable member
- //
- if (Invocation.IsMemberInvocable (member))
- invocable_member = member;
- continue;
- }
- //
- // Overload resolution is looking for base member but using parameter names
- // and default values from the closest member. That means to do expensive lookup
- // for the closest override for virtual or abstract members
- //
- if ((member.Modifiers & (Modifiers.VIRTUAL | Modifiers.ABSTRACT)) != 0) {
- var override_params = base_provider.GetOverrideMemberParameters (member);
- if (override_params != null)
- pm = override_params;
- }
- //
- // Check if the member candidate is applicable
- //
- bool params_expanded_form = false;
- bool dynamic_argument = false;
- TypeSpec rt = pm.MemberType;
- int candidate_rate = IsApplicable (rc, ref candidate_args, args_count, ref member, pm, ref params_expanded_form, ref dynamic_argument, ref rt, error_mode);
- if (lambda_conv_msgs != null)
- lambda_conv_msgs.EndSession ();
- //
- // How does it score compare to others
- //
- if (candidate_rate < best_candidate_rate) {
- // Fatal error (missing dependency), cannot continue
- if (candidate_rate < 0)
- return null;
- if ((restrictions & Restrictions.GetEnumeratorLookup) != 0 && candidate_args.Count != 0) {
- // Only parameterless methods are considered
- } else {
- best_candidate_rate = candidate_rate;
- best_candidate = member;
- best_candidate_args = candidate_args;
- best_candidate_params = params_expanded_form;
- best_candidate_dynamic = dynamic_argument;
- best_parameter_member = pm;
- best_candidate_return_type = rt;
- }
- } else if (candidate_rate == 0) {
- //
- // The member look is done per type for most operations but sometimes
- // it's not possible like for binary operators overload because they
- // are unioned between 2 sides
- //
- if ((restrictions & Restrictions.BaseMembersIncluded) != 0) {
- if (TypeSpec.IsBaseClass (best_candidate.DeclaringType, member.DeclaringType, true))
- continue;
- }
- bool is_better;
- if (best_candidate.DeclaringType.IsInterface && member.DeclaringType.ImplementsInterface (best_candidate.DeclaringType, false)) {
- //
- // We pack all interface members into top level type which makes the overload resolution
- // more complicated for interfaces. We compensate it by removing methods with same
- // signature when building the cache hence this path should not really be hit often
- //
- // Example:
- // interface IA { void Foo (int arg); }
- // interface IB : IA { void Foo (params int[] args); }
- //
- // IB::Foo is the best overload when calling IB.Foo (1)
- //
- is_better = true;
- if (ambiguous_candidates != null) {
- foreach (var amb_cand in ambiguous_candidates) {
- if (member.DeclaringType.ImplementsInterface (best_candidate.DeclaringType, false)) {
- continue;
- }
- is_better = false;
- break;
- }
- if (is_better)
- ambiguous_candidates = null;
- }
- } else {
- // Is the new candidate better
- is_better = BetterFunction (rc, candidate_args, member, pm.Parameters, params_expanded_form, best_candidate, best_parameter_member.Parameters, best_candidate_params);
- }
- if (is_better) {
- best_candidate = member;
- best_candidate_args = candidate_args;
- best_candidate_params = params_expanded_form;
- best_candidate_dynamic = dynamic_argument;
- best_parameter_member = pm;
- best_candidate_return_type = rt;
- } else {
- // It's not better but any other found later could be but we are not sure yet
- if (ambiguous_candidates == null)
- ambiguous_candidates = new List<AmbiguousCandidate> ();
- ambiguous_candidates.Add (new AmbiguousCandidate (member, pm.Parameters, params_expanded_form));
- }
- }
- // Restore expanded arguments
- candidate_args = args;
- }
- } while (best_candidate_rate != 0 && (type_members = base_provider.GetBaseMembers (type_members[0].DeclaringType.BaseType)) != null);
- //
- // We've found exact match
- //
- if (best_candidate_rate == 0)
- break;
- //
- // Try extension methods lookup when no ordinary method match was found and provider enables it
- //
- if (!error_mode) {
- var emg = base_provider.LookupExtensionMethod (rc);
- if (emg != null) {
- emg = emg.OverloadResolve (rc, ref args, null, restrictions);
- if (emg != null) {
- best_candidate_extension_group = emg;
- return (T) (MemberSpec) emg.BestCandidate;
- }
- }
- }
- // Don't run expensive error reporting mode for probing
- if (IsProbingOnly)
- return null;
- if (error_mode)
- break;
- if (lambda_conv_msgs != null && !lambda_conv_msgs.IsEmpty)
- break;
- lambda_conv_msgs = null;
- error_mode = true;
- }
- //
- // No best member match found, report an error
- //
- if (best_candidate_rate != 0 || error_mode) {
- ReportOverloadError (rc, best_candidate, best_parameter_member, best_candidate_args, best_candidate_params);
- return null;
- }
- if (best_candidate_dynamic) {
- if (args[0].IsExtensionType) {
- rc.Report.Error (1973, loc,
- "Type `{0}' does not contain a member `{1}' and the best extension method overload `{2}' cannot be dynamically dispatched. Consider calling the method without the extension method syntax",
- args [0].Type.GetSignatureForError (), best_candidate.Name, best_candidate.GetSignatureForError ());
- }
- //
- // Check type constraints only when explicit type arguments are used
- //
- if (best_candidate.IsGeneric && type_arguments != null) {
- MethodSpec bc = best_candidate as MethodSpec;
- if (bc != null && TypeParameterSpec.HasAnyTypeParameterConstrained (bc.GenericDefinition)) {
- ConstraintChecker cc = new ConstraintChecker (rc);
- cc.CheckAll (bc.GetGenericMethodDefinition (), bc.TypeArguments, bc.Constraints, loc);
- }
- }
- BestCandidateIsDynamic = true;
- return null;
- }
- //
- // These flags indicates we are running delegate probing conversion. No need to
- // do more expensive checks
- //
- if ((restrictions & (Restrictions.ProbingOnly | Restrictions.CovariantDelegate)) == (Restrictions.CovariantDelegate | Restrictions.ProbingOnly))
- return (T) best_candidate;
- if (ambiguous_candidates != null) {
- //
- // Now check that there are no ambiguities i.e the selected method
- // should be better than all the others
- //
- for (int ix = 0; ix < ambiguous_candidates.Count; ix++) {
- var candidate = ambiguous_candidates [ix];
- if (!BetterFunction (rc, best_candidate_args, best_candidate, best_parameter_member.Parameters, best_candidate_params, candidate.Member, candidate.Parameters, candidate.Expanded)) {
- var ambiguous = candidate.Member;
- if (custom_errors == null || !custom_errors.AmbiguousCandidates (rc, best_candidate, ambiguous)) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate);
- rc.Report.SymbolRelatedToPreviousError (ambiguous);
- rc.Report.Error (121, loc, "The call is ambiguous between the following methods or properties: `{0}' and `{1}'",
- best_candidate.GetSignatureForError (), ambiguous.GetSignatureForError ());
- }
- return (T) best_candidate;
- }
- }
- }
- if (invocable_member != null && !IsProbingOnly) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate);
- rc.Report.SymbolRelatedToPreviousError (invocable_member);
- rc.Report.Warning (467, 2, loc, "Ambiguity between method `{0}' and invocable non-method `{1}'. Using method group",
- best_candidate.GetSignatureForError (), invocable_member.GetSignatureForError ());
- }
- //
- // And now check if the arguments are all
- // compatible, perform conversions if
- // necessary etc. and return if everything is
- // all right
- //
- if (!VerifyArguments (rc, ref best_candidate_args, best_candidate, best_parameter_member, best_candidate_params))
- return null;
- if (best_candidate == null)
- return null;
- //
- // Don't run possibly expensive checks in probing mode
- //
- if (!IsProbingOnly && !rc.IsInProbingMode) {
- //
- // Check ObsoleteAttribute on the best method
- //
- ObsoleteAttribute oa = best_candidate.GetAttributeObsolete ();
- if (oa != null && !rc.IsObsolete)
- AttributeTester.Report_ObsoleteMessage (oa, best_candidate.GetSignatureForError (), loc, rc.Report);
- best_candidate.MemberDefinition.SetIsUsed ();
- }
- args = best_candidate_args;
- return (T) best_candidate;
- }
- public MethodSpec ResolveOperator (ResolveContext rc, ref Arguments args)
- {
- return ResolveMember<MethodSpec> (rc, ref args);
- }
- void ReportArgumentMismatch (ResolveContext ec, int idx, MemberSpec method,
- Argument a, AParametersCollection expected_par, TypeSpec paramType)
- {
- if (custom_errors != null && custom_errors.ArgumentMismatch (ec, method, a, idx))
- return;
- if (a.Type == InternalType.ErrorType)
- return;
- if (a is CollectionElementInitializer.ElementInitializerArgument) {
- ec.Report.SymbolRelatedToPreviousError (method);
- if ((expected_par.FixedParameters[idx].ModFlags & Parameter.Modifier.RefOutMask) != 0) {
- ec.Report.Error (1954, loc, "The best overloaded collection initalizer method `{0}' cannot have `ref' or `out' modifier",
- TypeManager.CSharpSignature (method));
- return;
- }
- ec.Report.Error (1950, loc, "The best overloaded collection initalizer method `{0}' has some invalid arguments",
- TypeManager.CSharpSignature (method));
- } else if (IsDelegateInvoke) {
- ec.Report.Error (1594, loc, "Delegate `{0}' has some invalid arguments",
- DelegateType.GetSignatureForError ());
- } else {
- ec.Report.SymbolRelatedToPreviousError (method);
- ec.Report.Error (1502, loc, "The best overloaded method match for `{0}' has some invalid arguments",
- method.GetSignatureForError ());
- }
- Parameter.Modifier mod = idx >= expected_par.Count ? 0 : expected_par.FixedParameters[idx].ModFlags;
- string index = (idx + 1).ToString ();
- if (((mod & Parameter.Modifier.RefOutMask) ^ (a.Modifier & Parameter.Modifier.RefOutMask)) != 0) {
- if ((mod & Parameter.Modifier.RefOutMask) == 0)
- ec.Report.Error (1615, a.Expr.Location, "Argument `#{0}' does not require `{1}' modifier. Consider removing `{1}' modifier",
- index, Parameter.GetModifierSignature (a.Modifier));
- else
- ec.Report.Error (1620, a.Expr.Location, "Argument `#{0}' is missing `{1}' modifier",
- index, Parameter.GetModifierSignature (mod));
- } else {
- string p1 = a.GetSignatureForError ();
- string p2 = paramType.GetSignatureForError ();
- if (p1 == p2) {
- p1 = a.Type.GetSignatureForErrorIncludingAssemblyName ();
- p2 = paramType.GetSignatureForErrorIncludingAssemblyName ();
- }
- if ((mod & Parameter.Modifier.RefOutMask) != 0) {
- p1 = Parameter.GetModifierSignature (a.Modifier) + " " + p1;
- p2 = Parameter.GetModifierSignature (a.Modifier) + " " + p2;
- }
- ec.Report.Error (1503, a.Expr.Location,
- "Argument `#{0}' cannot convert `{1}' expression to type `{2}'", index, p1, p2);
- }
- }
- //
- // We have failed to find exact match so we return error info about the closest match
- //
- void ReportOverloadError (ResolveContext rc, MemberSpec best_candidate, IParametersMember pm, Arguments args, bool params_expanded)
- {
- int ta_count = type_arguments == null ? 0 : type_arguments.Count;
- int arg_count = args == null ? 0 : args.Count;
- if (ta_count != best_candidate.Arity && (ta_count > 0 || ((IParametersMember) best_candidate).Parameters.IsEmpty)) {
- var mg = new MethodGroupExpr (new [] { best_candidate }, best_candidate.DeclaringType, loc);
- mg.Error_TypeArgumentsCannotBeUsed (rc, best_candidate, loc);
- return;
- }
- if (lambda_conv_msgs != null && lambda_conv_msgs.Merge (rc.Report.Printer)) {
- return;
- }
- if ((best_candidate.Modifiers & (Modifiers.PROTECTED | Modifiers.STATIC)) == Modifiers.PROTECTED &&
- InstanceQualifier != null && !InstanceQualifier.CheckProtectedMemberAccess (rc, best_candidate)) {
- MemberExpr.Error_ProtectedMemberAccess (rc, best_candidate, InstanceQualifier.InstanceType, loc);
- }
- //
- // For candidates which match on parameters count report more details about incorrect arguments
- //
- if (pm != null) {
- if (pm.Parameters.Count == arg_count || params_expanded || HasUnfilledParams (best_candidate, pm, args)) {
- // Reject any inaccessible member
- if (!best_candidate.IsAccessible (rc) || !best_candidate.DeclaringType.IsAccessible (rc)) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate);
- Expression.ErrorIsInaccesible (rc, best_candidate.GetSignatureForError (), loc);
- return;
- }
- var ms = best_candidate as MethodSpec;
- if (ms != null && ms.IsGeneric) {
- bool constr_ok = true;
- if (ms.TypeArguments != null)
- constr_ok = new ConstraintChecker (rc.MemberContext).CheckAll (ms.GetGenericMethodDefinition (), ms.TypeArguments, ms.Constraints, loc);
- if (ta_count == 0 && ms.TypeArguments == null) {
- if (custom_errors != null && custom_errors.TypeInferenceFailed (rc, best_candidate))
- return;
- if (constr_ok) {
- rc.Report.Error (411, loc,
- "The type arguments for method `{0}' cannot be inferred from the usage. Try specifying the type arguments explicitly",
- ms.GetGenericMethodDefinition ().GetSignatureForError ());
- }
- return;
- }
- }
- VerifyArguments (rc, ref args, best_candidate, pm, params_expanded);
- return;
- }
- }
- //
- // We failed to find any method with correct argument count, report best candidate
- //
- if (custom_errors != null && custom_errors.NoArgumentMatch (rc, best_candidate))
- return;
- if (best_candidate.Kind == MemberKind.Constructor) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate);
- Error_ConstructorMismatch (rc, best_candidate.DeclaringType, arg_count, loc);
- } else if (IsDelegateInvoke) {
- rc.Report.SymbolRelatedToPreviousError (DelegateType);
- rc.Report.Error (1593, loc, "Delegate `{0}' does not take `{1}' arguments",
- DelegateType.GetSignatureForError (), arg_count.ToString ());
- } else {
- string name = best_candidate.Kind == MemberKind.Indexer ? "this" : best_candidate.Name;
- rc.Report.SymbolRelatedToPreviousError (best_candidate);
- rc.Report.Error (1501, loc, "No overload for method `{0}' takes `{1}' arguments",
- name, arg_count.ToString ());
- }
- }
- static bool HasUnfilledParams (MemberSpec best_candidate, IParametersMember pm, Arguments args)
- {
- var p = ((IParametersMember)best_candidate).Parameters;
- if (!p.HasParams)
- return false;
- string name = null;
- for (int i = p.Count - 1; i != 0; --i) {
- var fp = p.FixedParameters [i];
- if ((fp.ModFlags & Parameter.Modifier.PARAMS) == 0)
- continue;
- name = fp.Name;
- break;
- }
- if (args == null)
- return false;
- foreach (var arg in args) {
- var na = arg as NamedArgument;
- if (na == null)
- continue;
- if (na.Name == name) {
- name = null;
- break;
- }
- }
- if (name == null)
- return false;
- return args.Count + 1 == pm.Parameters.Count;
- }
- bool VerifyArguments (ResolveContext ec, ref Arguments args, MemberSpec member, IParametersMember pm, bool chose_params_expanded)
- {
- var pd = pm.Parameters;
- var cpd = ((IParametersMember) member).Parameters;
- var ptypes = cpd.Types;
- Parameter.Modifier p_mod = 0;
- TypeSpec pt = null;
- int a_idx = 0, a_pos = 0;
- Argument a = null;
- ArrayInitializer params_initializers = null;
- bool has_unsafe_arg = pm.MemberType.IsPointer;
- int arg_count = args == null ? 0 : args.Count;
- for (; a_idx < arg_count; a_idx++, ++a_pos) {
- a = args[a_idx];
- if (a == null)
- continue;
- if (p_mod != Parameter.Modifier.PARAMS) {
- p_mod = cpd.FixedParameters [a_idx].ModFlags;
- pt = ptypes[a_idx];
- has_unsafe_arg |= pt.IsPointer;
- if (p_mod == Parameter.Modifier.PARAMS) {
- if (chose_params_expanded) {
- params_initializers = new ArrayInitializer (arg_count - a_idx, a.Expr.Location);
- pt = TypeManager.GetElementType (pt);
- }
- }
- }
- //
- // Types have to be identical when ref or out modifer is used
- //
- if (((a.Modifier | p_mod) & Parameter.Modifier.RefOutMask) != 0) {
- if ((a.Modifier & Parameter.Modifier.RefOutMask) != (p_mod & Parameter.Modifier.RefOutMask))
- break;
- if (a.Expr.Type == pt || TypeSpecComparer.IsEqual (a.Expr.Type, pt))
- continue;
- break;
- }
- NamedArgument na = a as NamedArgument;
- if (na != null) {
- int name_index = pd.GetParameterIndexByName (na.Name);
- if (name_index < 0 || name_index >= pd.Count) {
- if (IsDelegateInvoke) {
- ec.Report.SymbolRelatedToPreviousError (DelegateType);
- ec.Report.Error (1746, na.Location,
- "The delegate `{0}' does not contain a parameter named `{1}'",
- DelegateType.GetSignatureForError (), na.Name);
- } else {
- ec.Report.SymbolRelatedToPreviousError (member);
- ec.Report.Error (1739, na.Location,
- "The best overloaded method match for `{0}' does not contain a parameter named `{1}'",
- TypeManager.CSharpSignature (member), na.Name);
- }
- } else if (args[name_index] != a && args[name_index] != null) {
- if (IsDelegateInvoke)
- ec.Report.SymbolRelatedToPreviousError (DelegateType);
- else
- ec.Report.SymbolRelatedToPreviousError (member);
- ec.Report.Error (1744, na.Location,
- "Named argument `{0}' cannot be used for a parameter which has positional argument specified",
- na.Name);
- }
- }
-
- if (a.Expr.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
- continue;
- if ((restrictions & Restrictions.CovariantDelegate) != 0 && !Delegate.IsTypeCovariant (ec, a.Expr.Type, pt)) {
- custom_errors.NoArgumentMatch (ec, member);
- return false;
- }
- Expression conv;
- if (a.IsExtensionType) {
- if (a.Expr.Type == pt || TypeSpecComparer.IsEqual (a.Expr.Type, pt)) {
- conv = a.Expr;
- } else {
- conv = Convert.ImplicitReferenceConversion (a.Expr, pt, false);
- if (conv == null)
- conv = Convert.ImplicitBoxingConversion (a.Expr, a.Expr.Type, pt);
- }
- } else {
- conv = Convert.ImplicitConversion (ec, a.Expr, pt, loc);
- }
- if (conv == null)
- break;
- //
- // Convert params arguments to an array initializer
- //
- if (params_initializers != null) {
- // we choose to use 'a.Expr' rather than 'conv' so that
- // we don't hide the kind of expression we have (esp. CompoundAssign.Helper)
- params_initializers.Add (a.Expr);
- args.RemoveAt (a_idx--);
- --arg_count;
- a.Expr = conv;
- continue;
- }
- // Update the argument with the implicit conversion
- a.Expr = conv;
- }
- if (a_idx != arg_count) {
- ReportArgumentMismatch (ec, a_pos, member, a, pd, pt);
- return false;
- }
- //
- // Fill not provided arguments required by params modifier
- //
- if (params_initializers == null && arg_count + 1 == pd.Count) {
- if (args == null)
- args = new Arguments (1);
- pt = ptypes[pd.Count - 1];
- pt = TypeManager.GetElementType (pt);
- has_unsafe_arg |= pt.IsPointer;
- params_initializers = new ArrayInitializer (0, loc);
- }
- //
- // Append an array argument with all params arguments
- //
- if (params_initializers != null) {
- args.Add (new Argument (
- new ArrayCreation (new TypeExpression (pt, loc), params_initializers, loc).Resolve (ec)));
- arg_count++;
- }
- if (has_unsafe_arg && !ec.IsUnsafe) {
- Expression.UnsafeError (ec, loc);
- }
- //
- // We could infer inaccesible type arguments
- //
- if (type_arguments == null && member.IsGeneric) {
- var ms = (MethodSpec) member;
- foreach (var ta in ms.TypeArguments) {
- if (!ta.IsAccessible (ec)) {
- ec.Report.SymbolRelatedToPreviousError (ta);
- Expression.ErrorIsInaccesible (ec, member.GetSignatureForError (), loc);
- break;
- }
- }
- }
- return true;
- }
- }
- public class ConstantExpr : MemberExpr
- {
- readonly ConstSpec constant;
- public ConstantExpr (ConstSpec constant, Location loc)
- {
- this.constant = constant;
- this.loc = loc;
- }
- public override string Name {
- get { throw new NotImplementedException (); }
- }
- public override string KindName {
- get { return "constant"; }
- }
- public override bool IsInstance {
- get { return !IsStatic; }
- }
- public override bool IsStatic {
- get { return true; }
- }
- protected override TypeSpec DeclaringType {
- get { return constant.DeclaringType; }
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- throw new NotSupportedException ("ET");
- }
- protected override Expression DoResolve (ResolveContext rc)
- {
- ResolveInstanceExpression (rc, null);
- DoBestMemberChecks (rc, constant);
- var c = constant.GetConstant (rc);
- // Creates reference expression to the constant value
- return Constant.CreateConstantFromValue (constant.MemberType, c.GetValue (), loc);
- }
- public override void Emit (EmitContext ec)
- {
- throw new NotSupportedException ();
- }
- public override string GetSignatureForError ()
- {
- return constant.GetSignatureForError ();
- }
- public override void SetTypeArguments (ResolveContext ec, TypeArguments ta)
- {
- Error_TypeArgumentsCannotBeUsed (ec, "constant", GetSignatureForError (), loc);
- }
- }
- //
- // Fully resolved expression that references a Field
- //
- public class FieldExpr : MemberExpr, IDynamicAssign, IMemoryLocation, IVariableReference
- {
- protected FieldSpec spec;
- VariableInfo variable_info;
-
- LocalTemporary temp;
- bool prepared;
-
- protected FieldExpr (Location l)
- {
- loc = l;
- }
- public FieldExpr (FieldSpec spec, Location loc)
- {
- this.spec = spec;
- this.loc = loc;
- type = spec.MemberType;
- }
-
- public FieldExpr (FieldBase fi, Location l)
- : this (fi.Spec, l)
- {
- }
- #region Properties
- public override string Name {
- get {
- return spec.Name;
- }
- }
- public bool IsHoisted {
- get {
- IVariableReference hv = InstanceExpression as IVariableReference;
- return hv != null && hv.IsHoisted;
- }
- }
- public override bool IsInstance {
- get {
- return !spec.IsStatic;
- }
- }
- public override bool IsStatic {
- get {
- return spec.IsStatic;
- }
- }
- public override string KindName {
- get { return "field"; }
- }
- public FieldSpec Spec {
- get {
- return spec;
- }
- }
- protected override TypeSpec DeclaringType {
- get {
- return spec.DeclaringType;
- }
- }
- public VariableInfo VariableInfo {
- get {
- return variable_info;
- }
- }
- #endregion
- public override string GetSignatureForError ()
- {
- return spec.GetSignatureForError ();
- }
- public bool IsMarshalByRefAccess (ResolveContext rc)
- {
- // Checks possible ldflda of field access expression
- return !spec.IsStatic && TypeSpec.IsValueType (spec.MemberType) && !(InstanceExpression is This) &&
- rc.Module.PredefinedTypes.MarshalByRefObject.Define () &&
- TypeSpec.IsBaseClass (spec.DeclaringType, rc.Module.PredefinedTypes.MarshalByRefObject.TypeSpec, false);
- }
- public void SetHasAddressTaken ()
- {
- IVariableReference vr = InstanceExpression as IVariableReference;
- if (vr != null) {
- vr.SetHasAddressTaken ();
- }
- }
- protected override void CloneTo (CloneContext clonectx, Expression target)
- {
- var t = (FieldExpr) target;
- if (InstanceExpression != null)
- t.InstanceExpression = InstanceExpression.Clone (clonectx);
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- if (ConditionalAccess) {
- Error_NullShortCircuitInsideExpressionTree (ec);
- }
- return CreateExpressionTree (ec, true);
- }
- public Expression CreateExpressionTree (ResolveContext ec, bool convertInstance)
- {
- Arguments args;
- Expression instance;
- if (InstanceExpression == null) {
- instance = new NullLiteral (loc);
- } else if (convertInstance) {
- instance = InstanceExpression.CreateExpressionTree (ec);
- } else {
- args = new Arguments (1);
- args.Add (new Argument (InstanceExpression));
- instance = CreateExpressionFactoryCall (ec, "Constant", args);
- }
- args = Arguments.CreateForExpressionTree (ec, null,
- instance,
- CreateTypeOfExpression ());
- return CreateExpressionFactoryCall (ec, "Field", args);
- }
- public Expression CreateTypeOfExpression ()
- {
- return new TypeOfField (spec, loc);
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- spec.MemberDefinition.SetIsUsed ();
- return DoResolve (ec, null);
- }
- Expression DoResolve (ResolveContext ec, Expression rhs)
- {
- bool lvalue_instance = rhs != null && IsInstance && spec.DeclaringType.IsStruct;
- if (rhs != this) {
- ResolveConditionalAccessReceiver (ec);
- if (ResolveInstanceExpression (ec, rhs)) {
- // Resolve the field's instance expression while flow analysis is turned
- // off: when accessing a field "a.b", we must check whether the field
- // "a.b" is initialized, not whether the whole struct "a" is initialized.
- if (lvalue_instance) {
- bool out_access = rhs == EmptyExpression.OutAccess || rhs == EmptyExpression.LValueMemberOutAccess;
- Expression right_side =
- out_access ? EmptyExpression.LValueMemberOutAccess : EmptyExpression.LValueMemberAccess;
- InstanceExpression = InstanceExpression.ResolveLValue (ec, right_side);
- } else {
- InstanceExpression = InstanceExpression.Resolve (ec, ResolveFlags.VariableOrValue);
- }
- if (InstanceExpression == null)
- return null;
- }
- DoBestMemberChecks (ec, spec);
- if (conditional_access_receiver)
- ec.With (ResolveContext.Options.ConditionalAccessReceiver, false);
- }
- var fb = spec as FixedFieldSpec;
- IVariableReference var = InstanceExpression as IVariableReference;
- if (fb != null) {
- IFixedExpression fe = InstanceExpression as IFixedExpression;
- if (!ec.HasSet (ResolveContext.Options.FixedInitializerScope) && (fe == null || !fe.IsFixed)) {
- ec.Report.Error (1666, loc, "You cannot use fixed size buffers contained in unfixed expressions. Try using the fixed statement");
- }
- if (InstanceExpression.eclass != ExprClass.Variable) {
- ec.Report.SymbolRelatedToPreviousError (spec);
- ec.Report.Error (1708, loc, "`{0}': Fixed size buffers can only be accessed through locals or fields",
- TypeManager.GetFullNameSignature (spec));
- } else if (var != null && var.IsHoisted) {
- AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, var, loc);
- }
- return new FixedBufferPtr (this, fb.ElementType, loc).Resolve (ec);
- }
- //
- // Set flow-analysis variable info for struct member access. It will be check later
- // for precise error reporting
- //
- if (var != null && var.VariableInfo != null && InstanceExpression.Type.IsStruct) {
- variable_info = var.VariableInfo.GetStructFieldInfo (Name);
- }
- if (ConditionalAccess) {
- if (conditional_access_receiver)
- type = LiftMemberType (ec, type);
- if (InstanceExpression.IsNull)
- return Constant.CreateConstantFromValue (type, null, loc);
- }
- eclass = ExprClass.Variable;
- return this;
- }
- public void SetFieldAssigned (FlowAnalysisContext fc)
- {
- if (!IsInstance)
- return;
- bool lvalue_instance = spec.DeclaringType.IsStruct;
- if (lvalue_instance) {
- var var = InstanceExpression as IVariableReference;
- if (var != null && var.VariableInfo != null) {
- fc.SetStructFieldAssigned (var.VariableInfo, Name);
- }
- }
- var fe = InstanceExpression as FieldExpr;
- if (fe != null) {
- Expression instance;
- do {
- instance = fe.InstanceExpression;
- var fe_instance = instance as FieldExpr;
- if ((fe_instance != null && !fe_instance.IsStatic) || instance is LocalVariableReference) {
- if (TypeSpec.IsReferenceType (fe.Type) && instance.Type.IsStruct) {
- var var = InstanceExpression as IVariableReference;
- if (var != null && var.VariableInfo == null) {
- var var_inst = instance as IVariableReference;
- if (var_inst == null || (var_inst.VariableInfo != null && !fc.IsDefinitelyAssigned (var_inst.VariableInfo)))
- fc.Report.Warning (1060, 1, fe.loc, "Use of possibly unassigned field `{0}'", fe.Name);
- }
- }
- if (fe_instance != null) {
- fe = fe_instance;
- continue;
- }
- }
- break;
- } while (true);
- if (instance != null && TypeSpec.IsReferenceType (instance.Type))
- instance.FlowAnalysis (fc);
- } else {
- if (TypeSpec.IsReferenceType (InstanceExpression.Type))
- InstanceExpression.FlowAnalysis (fc);
- }
- }
- Expression Error_AssignToReadonly (ResolveContext rc, Expression right_side)
- {
- // The return value is always null. Returning a value simplifies calling code.
-
- if (right_side == EmptyExpression.OutAccess) {
- if (IsStatic) {
- rc.Report.Error (199, loc, "A static readonly field `{0}' cannot be passed ref or out (except in a static constructor)",
- GetSignatureForError ());
- } else {
- rc.Report.Error (192, loc, "A readonly field `{0}' cannot be passed ref or out (except in a constructor)",
- GetSignatureForError ());
- }
- return null;
- }
- if (right_side == EmptyExpression.LValueMemberAccess) {
- // Already reported as CS1648/CS1650
- return null;
- }
- if (right_side == EmptyExpression.LValueMemberOutAccess) {
- if (IsStatic) {
- rc.Report.Error (1651, loc, "Fields of static readonly field `{0}' cannot be passed ref or out (except in a static constructor)",
- GetSignatureForError ());
- } else {
- rc.Report.Error (1649, loc, "Members of readonly field `{0}' cannot be passed ref or out (except in a constructor)",
- GetSignatureForError ());
- }
- return null;
- }
- if (IsStatic) {
- rc.Report.Error (198, loc, "A static readonly field `{0}' cannot be assigned to (except in a static constructor or a variable initializer)",
- GetSignatureForError ());
- } else {
- rc.Report.Error (191, loc, "A readonly field `{0}' cannot be assigned to (except in a constructor or a variable initializer)",
- GetSignatureForError ());
- }
- return null;
- }
- public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
- {
- if (ConditionalAccess)
- throw new NotSupportedException ("null propagating operator assignment");
- if (spec is FixedFieldSpec) {
- // It could be much better error message but we want to be error compatible
- Error_ValueAssignment (ec, right_side);
- }
- Expression e = DoResolve (ec, right_side);
- if (e == null)
- return null;
- spec.MemberDefinition.SetIsAssigned ();
- if ((right_side == EmptyExpression.UnaryAddress || right_side == EmptyExpression.OutAccess) &&
- (spec.Modifiers & Modifiers.VOLATILE) != 0) {
- ec.Report.Warning (420, 1, loc,
- "`{0}': A volatile field references will not be treated as volatile",
- spec.GetSignatureForError ());
- }
- if (spec.IsReadOnly) {
- // InitOnly fields can only be assigned in constructors or initializers
- if (!ec.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.ConstructorScope))
- return Error_AssignToReadonly (ec, right_side);
- if (ec.HasSet (ResolveContext.Options.ConstructorScope)) {
- // InitOnly fields cannot be assigned-to in a different constructor from their declaring type
- if (ec.CurrentMemberDefinition.Parent.PartialContainer.Definition != spec.DeclaringType.GetDefinition ())
- return Error_AssignToReadonly (ec, right_side);
- // static InitOnly fields cannot be assigned-to in an instance constructor
- if (IsStatic && !ec.IsStatic)
- return Error_AssignToReadonly (ec, right_side);
- // instance constructors can't modify InitOnly fields of other instances of the same type
- if (!IsStatic && !(InstanceExpression is This))
- return Error_AssignToReadonly (ec, right_side);
- }
- }
- if (right_side == EmptyExpression.OutAccess && IsMarshalByRefAccess (ec)) {
- ec.Report.SymbolRelatedToPreviousError (spec.DeclaringType);
- ec.Report.Warning (197, 1, loc,
- "Passing `{0}' as ref or out or taking its address may cause a runtime exception because it is a field of a marshal-by-reference class",
- GetSignatureForError ());
- }
- eclass = ExprClass.Variable;
- return this;
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- var var = InstanceExpression as IVariableReference;
- if (var != null) {
- var vi = var.VariableInfo;
- if (vi != null && !fc.IsStructFieldDefinitelyAssigned (vi, Name)) {
- fc.Report.Error (170, loc, "Use of possibly unassigned field `{0}'", Name);
- return;
- }
- if (TypeSpec.IsValueType (InstanceExpression.Type) && InstanceExpression is VariableReference)
- return;
- }
- base.FlowAnalysis (fc);
- if (conditional_access_receiver)
- fc.ConditionalAccessEnd ();
- }
- public override int GetHashCode ()
- {
- return spec.GetHashCode ();
- }
-
- public bool IsFixed {
- get {
- //
- // A variable of the form V.I is fixed when V is a fixed variable of a struct type
- //
- IVariableReference variable = InstanceExpression as IVariableReference;
- if (variable != null)
- return InstanceExpression.Type.IsStruct && variable.IsFixed;
- IFixedExpression fe = InstanceExpression as IFixedExpression;
- return fe != null && fe.IsFixed;
- }
- }
- public override bool Equals (object obj)
- {
- FieldExpr fe = obj as FieldExpr;
- if (fe == null)
- return false;
- if (spec != fe.spec)
- return false;
- if (InstanceExpression == null || fe.InstanceExpression == null)
- return true;
- return InstanceExpression.Equals (fe.InstanceExpression);
- }
-
- public void Emit (EmitContext ec, bool leave_copy)
- {
- bool is_volatile = (spec.Modifiers & Modifiers.VOLATILE) != 0;
- if (IsStatic){
- if (is_volatile)
- ec.Emit (OpCodes.Volatile);
- ec.Emit (OpCodes.Ldsfld, spec);
- } else {
- if (!prepared) {
- if (conditional_access_receiver)
- ec.ConditionalAccess = new ConditionalAccessContext (type, ec.DefineLabel ());
- EmitInstance (ec, false);
- }
- // Optimization for build-in types
- if (type.IsStruct && type == ec.CurrentType && InstanceExpression.Type == type) {
- ec.EmitLoadFromPtr (type);
- } else {
- var ff = spec as FixedFieldSpec;
- if (ff != null) {
- ec.Emit (OpCodes.Ldflda, spec);
- ec.Emit (OpCodes.Ldflda, ff.Element);
- } else {
- if (is_volatile)
- ec.Emit (OpCodes.Volatile);
- ec.Emit (OpCodes.Ldfld, spec);
- }
- }
- if (conditional_access_receiver) {
- ec.CloseConditionalAccess (type.IsNullableType && type != spec.MemberType ? type : null);
- }
- }
- if (leave_copy) {
- ec.Emit (OpCodes.Dup);
- if (!IsStatic) {
- temp = new LocalTemporary (this.Type);
- temp.Store (ec);
- }
- }
- }
- public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
- {
- bool has_await_source = ec.HasSet (BuilderContext.Options.AsyncBody) && source.ContainsEmitWithAwait ();
- if (isCompound && !(source is DynamicExpressionStatement) && !has_await_source) {
- prepared = true;
- }
- if (IsInstance) {
- if (ConditionalAccess)
- throw new NotImplementedException ("null operator assignment");
- if (has_await_source)
- source = source.EmitToField (ec);
- EmitInstance (ec, prepared);
- }
- source.Emit (ec);
- if (leave_copy || ec.NotifyEvaluatorOnStore) {
- ec.Emit (OpCodes.Dup);
- if (!IsStatic) {
- temp = new LocalTemporary (this.Type);
- temp.Store (ec);
- }
- }
- if ((spec.Modifiers & Modifiers.VOLATILE) != 0)
- ec.Emit (OpCodes.Volatile);
-
- spec.MemberDefinition.SetIsAssigned ();
- if (IsStatic)
- ec.Emit (OpCodes.Stsfld, spec);
- else
- ec.Emit (OpCodes.Stfld, spec);
- if (ec.NotifyEvaluatorOnStore) {
- if (!IsStatic)
- throw new NotImplementedException ("instance field write");
- if (leave_copy)
- ec.Emit (OpCodes.Dup);
- ec.Module.Evaluator.EmitValueChangedCallback (ec, Name, type, loc);
- }
-
- if (temp != null) {
- temp.Emit (ec);
- temp.Release (ec);
- temp = null;
- }
- }
- //
- // Emits store to field with prepared values on stack
- //
- public void EmitAssignFromStack (EmitContext ec)
- {
- if (IsStatic) {
- ec.Emit (OpCodes.Stsfld, spec);
- } else {
- ec.Emit (OpCodes.Stfld, spec);
- }
- }
- public override void Emit (EmitContext ec)
- {
- Emit (ec, false);
- }
- public override void EmitSideEffect (EmitContext ec)
- {
- bool is_volatile = (spec.Modifiers & Modifiers.VOLATILE) != 0;
- if (is_volatile) // || is_marshal_by_ref ())
- base.EmitSideEffect (ec);
- }
- public virtual void AddressOf (EmitContext ec, AddressOp mode)
- {
- if ((mode & AddressOp.Store) != 0)
- spec.MemberDefinition.SetIsAssigned ();
- if ((mode & AddressOp.Load) != 0)
- spec.MemberDefinition.SetIsUsed ();
- //
- // Handle initonly fields specially: make a copy and then
- // get the address of the copy.
- //
- bool need_copy;
- if (spec.IsReadOnly){
- need_copy = true;
- if (ec.HasSet (EmitContext.Options.ConstructorScope) && spec.DeclaringType == ec.CurrentType) {
- if (IsStatic){
- if (ec.IsStatic)
- need_copy = false;
- } else
- need_copy = false;
- }
- } else
- need_copy = false;
-
- if (need_copy) {
- Emit (ec);
- var temp = ec.GetTemporaryLocal (type);
- ec.Emit (OpCodes.Stloc, temp);
- ec.Emit (OpCodes.Ldloca, temp);
- return;
- }
- if (IsStatic){
- ec.Emit (OpCodes.Ldsflda, spec);
- } else {
- if (!prepared)
- EmitInstance (ec, false);
- ec.Emit (OpCodes.Ldflda, spec);
- }
- }
- public SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source)
- {
- return MakeExpression (ctx);
- }
- public override SLE.Expression MakeExpression (BuilderContext ctx)
- {
- #if STATIC
- return base.MakeExpression (ctx);
- #else
- return SLE.Expression.Field (
- IsStatic ? null : InstanceExpression.MakeExpression (ctx),
- spec.GetMetaInfo ());
- #endif
- }
- public override void SetTypeArguments (ResolveContext ec, TypeArguments ta)
- {
- Error_TypeArgumentsCannotBeUsed (ec, "field", GetSignatureForError (), loc);
- }
- }
-
- //
- // Expression that evaluates to a Property.
- //
- // This is not an LValue because we need to re-write the expression. We
- // can not take data from the stack and store it.
- //
- sealed class PropertyExpr : PropertyOrIndexerExpr<PropertySpec>
- {
- Arguments arguments;
- public PropertyExpr (PropertySpec spec, Location l)
- : base (l)
- {
- best_candidate = spec;
- type = spec.MemberType;
- }
- #region Properties
- protected override Arguments Arguments {
- get {
- return arguments;
- }
- set {
- arguments = value;
- }
- }
- protected override TypeSpec DeclaringType {
- get {
- return best_candidate.DeclaringType;
- }
- }
- public override string Name {
- get {
- return best_candidate.Name;
- }
- }
- public override bool IsInstance {
- get {
- return !IsStatic;
- }
- }
- public override bool IsStatic {
- get {
- return best_candidate.IsStatic;
- }
- }
- public override string KindName {
- get { return "property"; }
- }
- public PropertySpec PropertyInfo {
- get {
- return best_candidate;
- }
- }
- #endregion
- public override MethodGroupExpr CanReduceLambda (AnonymousMethodBody body)
- {
- if (best_candidate == null || !(best_candidate.IsStatic || InstanceExpression is This))
- return null;
- var args_count = arguments == null ? 0 : arguments.Count;
- if (args_count != body.Parameters.Count && args_count == 0)
- return null;
- var mg = MethodGroupExpr.CreatePredefined (best_candidate.Get, DeclaringType, loc);
- mg.InstanceExpression = InstanceExpression;
- return mg;
- }
- public static PropertyExpr CreatePredefined (PropertySpec spec, Location loc)
- {
- return new PropertyExpr (spec, loc) {
- Getter = spec.Get,
- Setter = spec.Set
- };
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- if (ConditionalAccess) {
- Error_NullShortCircuitInsideExpressionTree (ec);
- }
- Arguments args;
- if (IsSingleDimensionalArrayLength ()) {
- args = new Arguments (1);
- args.Add (new Argument (InstanceExpression.CreateExpressionTree (ec)));
- return CreateExpressionFactoryCall (ec, "ArrayLength", args);
- }
- args = new Arguments (2);
- if (InstanceExpression == null)
- args.Add (new Argument (new NullLiteral (loc)));
- else
- args.Add (new Argument (InstanceExpression.CreateExpressionTree (ec)));
- args.Add (new Argument (new TypeOfMethod (Getter, loc)));
- return CreateExpressionFactoryCall (ec, "Property", args);
- }
- public Expression CreateSetterTypeOfExpression (ResolveContext rc)
- {
- DoResolveLValue (rc, null);
- return new TypeOfMethod (Setter, loc);
- }
- public override string GetSignatureForError ()
- {
- return best_candidate.GetSignatureForError ();
- }
- public override SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source)
- {
- #if STATIC
- return base.MakeExpression (ctx);
- #else
- return SLE.Expression.Property (InstanceExpression.MakeExpression (ctx), (MethodInfo) Setter.GetMetaInfo ());
- #endif
- }
- public override SLE.Expression MakeExpression (BuilderContext ctx)
- {
- #if STATIC
- return base.MakeExpression (ctx);
- #else
- return SLE.Expression.Property (InstanceExpression.MakeExpression (ctx), (MethodInfo) Getter.GetMetaInfo ());
- #endif
- }
- void Error_PropertyNotValid (ResolveContext ec)
- {
- ec.Report.SymbolRelatedToPreviousError (best_candidate);
- ec.Report.Error (1546, loc, "Property or event `{0}' is not supported by the C# language",
- GetSignatureForError ());
- }
- bool IsSingleDimensionalArrayLength ()
- {
- if (best_candidate.DeclaringType.BuiltinType != BuiltinTypeSpec.Type.Array || !best_candidate.HasGet || Name != "Length")
- return false;
- ArrayContainer ac = InstanceExpression.Type as ArrayContainer;
- return ac != null && ac.Rank == 1;
- }
- public override void Emit (EmitContext ec, bool leave_copy)
- {
- //
- // Special case: length of single dimension array property is turned into ldlen
- //
- if (IsSingleDimensionalArrayLength ()) {
- if (conditional_access_receiver) {
- ec.ConditionalAccess = new ConditionalAccessContext (type, ec.DefineLabel ());
- }
- EmitInstance (ec, false);
- ec.Emit (OpCodes.Ldlen);
- ec.Emit (OpCodes.Conv_I4);
- if (conditional_access_receiver) {
- ec.CloseConditionalAccess (type);
- }
- return;
- }
- base.Emit (ec, leave_copy);
- }
- public override void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
- {
- Arguments args;
- LocalTemporary await_source_arg = null;
- if (isCompound && !(source is DynamicExpressionStatement)) {
- emitting_compound_assignment = true;
- source.Emit (ec);
- if (has_await_arguments) {
- await_source_arg = new LocalTemporary (Type);
- await_source_arg.Store (ec);
- args = new Arguments (1);
- args.Add (new Argument (await_source_arg));
- if (leave_copy) {
- temp = await_source_arg;
- }
- has_await_arguments = false;
- } else {
- args = null;
- if (leave_copy) {
- ec.Emit (OpCodes.Dup);
- temp = new LocalTemporary (this.Type);
- temp.Store (ec);
- }
- }
- } else {
- args = arguments ?? new Arguments (1);
- if (leave_copy) {
- source.Emit (ec);
- temp = new LocalTemporary (this.Type);
- temp.Store (ec);
- args.Add (new Argument (temp));
- } else {
- args.Add (new Argument (source));
- }
- }
- emitting_compound_assignment = false;
- var call = new CallEmitter ();
- call.InstanceExpression = InstanceExpression;
- if (args == null)
- call.InstanceExpressionOnStack = true;
- if (ConditionalAccess) {
- call.ConditionalAccess = true;
- }
- if (leave_copy)
- call.Emit (ec, Setter, args, loc);
- else
- call.EmitStatement (ec, Setter, args, loc);
- if (temp != null) {
- temp.Emit (ec);
- temp.Release (ec);
- }
- if (await_source_arg != null) {
- await_source_arg.Release (ec);
- }
- }
- public override void FlowAnalysis (FlowAnalysisContext fc)
- {
- base.FlowAnalysis (fc);
- if (conditional_access_receiver)
- fc.ConditionalAccessEnd ();
- }
- protected override Expression OverloadResolve (ResolveContext rc, Expression right_side)
- {
- eclass = ExprClass.PropertyAccess;
- if (best_candidate.IsNotCSharpCompatible) {
- Error_PropertyNotValid (rc);
- }
- ResolveInstanceExpression (rc, right_side);
- if ((best_candidate.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL)) != 0 && best_candidate.DeclaringType != InstanceExpression.Type) {
- var filter = new MemberFilter (best_candidate.Name, 0, MemberKind.Property, null, null);
- var p = MemberCache.FindMember (InstanceExpression.Type, filter, BindingRestriction.InstanceOnly | BindingRestriction.OverrideOnly) as PropertySpec;
- if (p != null) {
- type = p.MemberType;
- }
- }
- DoBestMemberChecks (rc, best_candidate);
- // Handling of com-imported properties with any number of default property parameters
- if (best_candidate.HasGet && !best_candidate.Get.Parameters.IsEmpty) {
- var p = best_candidate.Get.Parameters;
- arguments = new Arguments (p.Count);
- for (int i = 0; i < p.Count; ++i) {
- arguments.Add (new Argument (OverloadResolver.ResolveDefaultValueArgument (rc, p.Types [i], p.FixedParameters [i].DefaultValue, loc)));
- }
- } else if (best_candidate.HasSet && best_candidate.Set.Parameters.Count > 1) {
- var p = best_candidate.Set.Parameters;
- arguments = new Arguments (p.Count - 1);
- for (int i = 0; i < p.Count - 1; ++i) {
- arguments.Add (new Argument (OverloadResolver.ResolveDefaultValueArgument (rc, p.Types [i], p.FixedParameters [i].DefaultValue, loc)));
- }
- }
- return this;
- }
- public override void SetTypeArguments (ResolveContext ec, TypeArguments ta)
- {
- Error_TypeArgumentsCannotBeUsed (ec, "property", GetSignatureForError (), loc);
- }
- }
- abstract class PropertyOrIndexerExpr<T> : MemberExpr, IDynamicAssign where T : PropertySpec
- {
- // getter and setter can be different for base calls
- MethodSpec getter, setter;
- protected T best_candidate;
- protected LocalTemporary temp;
- protected bool emitting_compound_assignment;
- protected bool has_await_arguments;
- protected PropertyOrIndexerExpr (Location l)
- {
- loc = l;
- }
- #region Properties
- protected abstract Arguments Arguments { get; set; }
- public MethodSpec Getter {
- get {
- return getter;
- }
- set {
- getter = value;
- }
- }
- public MethodSpec Setter {
- get {
- return setter;
- }
- set {
- setter = value;
- }
- }
- #endregion
- protected override Expression DoResolve (ResolveContext ec)
- {
- if (eclass == ExprClass.Unresolved) {
- ResolveConditionalAccessReceiver (ec);
- var expr = OverloadResolve (ec, null);
- if (expr == null)
- return null;
- if (expr != this)
- return expr.Resolve (ec);
- if (conditional_access_receiver) {
- type = LiftMemberType (ec, type);
- ec.With (ResolveContext.Options.ConditionalAccessReceiver, false);
- }
- }
- if (!ResolveGetter (ec))
- return null;
- return this;
- }
- public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
- {
- if (ConditionalAccess)
- throw new NotSupportedException ("null propagating operator assignment");
- if (right_side == EmptyExpression.OutAccess) {
- // TODO: best_candidate can be null at this point
- INamedBlockVariable variable = null;
- if (best_candidate != null && ec.CurrentBlock.ParametersBlock.TopBlock.GetLocalName (best_candidate.Name, ec.CurrentBlock, ref variable) && variable is Linq.RangeVariable) {
- ec.Report.Error (1939, loc, "A range variable `{0}' may not be passes as `ref' or `out' parameter",
- best_candidate.Name);
- } else {
- right_side.DoResolveLValue (ec, this);
- }
- return null;
- }
- if (eclass == ExprClass.Unresolved) {
- var expr = OverloadResolve (ec, right_side);
- if (expr == null)
- return null;
- if (expr != this)
- return expr.ResolveLValue (ec, right_side);
- } else {
- ResolveInstanceExpression (ec, right_side);
- }
- if (!ResolveSetter (ec))
- return null;
- return this;
- }
- void EmitConditionalAccess (EmitContext ec, ref CallEmitter call, MethodSpec method, Arguments arguments)
- {
- ec.ConditionalAccess = new ConditionalAccessContext (type, ec.DefineLabel ());
- call.Emit (ec, method, arguments, loc);
- ec.CloseConditionalAccess (method.ReturnType != type && type.IsNullableType ? type : null);
- }
- //
- // Implements the IAssignMethod interface for assignments
- //
- public virtual void Emit (EmitContext ec, bool leave_copy)
- {
- var call = new CallEmitter ();
- call.ConditionalAccess = ConditionalAccess;
- call.InstanceExpression = InstanceExpression;
- if (has_await_arguments)
- call.HasAwaitArguments = true;
- else
- call.DuplicateArguments = emitting_compound_assignment;
- if (conditional_access_receiver)
- EmitConditionalAccess (ec, ref call, Getter, Arguments);
- else
- call.Emit (ec, Getter, Arguments, loc);
- if (call.HasAwaitArguments) {
- InstanceExpression = call.InstanceExpression;
- Arguments = call.EmittedArguments;
- has_await_arguments = true;
- }
- if (leave_copy) {
- ec.Emit (OpCodes.Dup);
- temp = new LocalTemporary (Type);
- temp.Store (ec);
- }
- }
- public abstract void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound);
- public override void Emit (EmitContext ec)
- {
- Emit (ec, false);
- }
- protected override FieldExpr EmitToFieldSource (EmitContext ec)
- {
- has_await_arguments = true;
- Emit (ec, false);
- return null;
- }
- public abstract SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source);
- protected abstract Expression OverloadResolve (ResolveContext rc, Expression right_side);
- bool ResolveGetter (ResolveContext rc)
- {
- if (!best_candidate.HasGet) {
- if (InstanceExpression != EmptyExpression.Null) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate);
- rc.Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks the `get' accessor",
- best_candidate.GetSignatureForError ());
- return false;
- }
- } else if (!best_candidate.Get.IsAccessible (rc) || !best_candidate.Get.DeclaringType.IsAccessible (rc)) {
- if (best_candidate.HasDifferentAccessibility) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate.Get);
- rc.Report.Error (271, loc, "The property or indexer `{0}' cannot be used in this context because the get accessor is inaccessible",
- TypeManager.CSharpSignature (best_candidate));
- } else {
- rc.Report.SymbolRelatedToPreviousError (best_candidate.Get);
- ErrorIsInaccesible (rc, best_candidate.Get.GetSignatureForError (), loc);
- }
- }
- if (best_candidate.HasDifferentAccessibility) {
- CheckProtectedMemberAccess (rc, best_candidate.Get);
- }
- getter = CandidateToBaseOverride (rc, best_candidate.Get);
- return true;
- }
- bool ResolveSetter (ResolveContext rc)
- {
- if (!best_candidate.HasSet) {
- rc.Report.Error (200, loc, "Property or indexer `{0}' cannot be assigned to (it is read-only)",
- GetSignatureForError ());
- return false;
- }
- if (!best_candidate.Set.IsAccessible (rc) || !best_candidate.Set.DeclaringType.IsAccessible (rc)) {
- if (best_candidate.HasDifferentAccessibility) {
- rc.Report.SymbolRelatedToPreviousError (best_candidate.Set);
- rc.Report.Error (272, loc, "The property or indexer `{0}' cannot be used in this context because the set accessor is inaccessible",
- GetSignatureForError ());
- } else {
- rc.Report.SymbolRelatedToPreviousError (best_candidate.Set);
- ErrorIsInaccesible (rc, best_candidate.GetSignatureForError (), loc);
- }
- }
- if (best_candidate.HasDifferentAccessibility)
- CheckProtectedMemberAccess (rc, best_candidate.Set);
- setter = CandidateToBaseOverride (rc, best_candidate.Set);
- return true;
- }
- }
- /// <summary>
- /// Fully resolved expression that evaluates to an Event
- /// </summary>
- public class EventExpr : MemberExpr, IAssignMethod
- {
- readonly EventSpec spec;
- MethodSpec op;
- public EventExpr (EventSpec spec, Location loc)
- {
- this.spec = spec;
- this.loc = loc;
- }
- #region Properties
- protected override TypeSpec DeclaringType {
- get {
- return spec.DeclaringType;
- }
- }
- public override string Name {
- get {
- return spec.Name;
- }
- }
- public override bool IsInstance {
- get {
- return !spec.IsStatic;
- }
- }
- public override bool IsStatic {
- get {
- return spec.IsStatic;
- }
- }
- public override string KindName {
- get { return "event"; }
- }
- public MethodSpec Operator {
- get {
- return op;
- }
- }
- #endregion
- public override MemberExpr ResolveMemberAccess (ResolveContext ec, Expression left, SimpleName original)
- {
- //
- // If the event is local to this class and we are not lhs of +=/-= we transform ourselves into a FieldExpr
- //
- if (!ec.HasSet (ResolveContext.Options.CompoundAssignmentScope)) {
- if (spec.BackingField != null &&
- (spec.DeclaringType == ec.CurrentType || TypeManager.IsNestedChildOf (ec.CurrentType, spec.DeclaringType.MemberDefinition))) {
- spec.MemberDefinition.SetIsUsed ();
- if (!ec.IsObsolete) {
- ObsoleteAttribute oa = spec.GetAttributeObsolete ();
- if (oa != null)
- AttributeTester.Report_ObsoleteMessage (oa, spec.GetSignatureForError (), loc, ec.Report);
- }
- if ((spec.Modifiers & (Modifiers.ABSTRACT | Modifiers.EXTERN)) != 0)
- Error_AssignmentEventOnly (ec);
- FieldExpr ml = new FieldExpr (spec.BackingField, loc);
- InstanceExpression = null;
- return ml.ResolveMemberAccess (ec, left, original);
- }
- }
- return base.ResolveMemberAccess (ec, left, original);
- }
- public override Expression CreateExpressionTree (ResolveContext ec)
- {
- throw new NotSupportedException ("ET");
- }
- public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
- {
- if (right_side == EmptyExpression.EventAddition) {
- op = spec.AccessorAdd;
- } else if (right_side == EmptyExpression.EventSubtraction) {
- op = spec.AccessorRemove;
- }
- if (op == null) {
- Error_AssignmentEventOnly (ec);
- return null;
- }
- op = CandidateToBaseOverride (ec, op);
- return this;
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- eclass = ExprClass.EventAccess;
- type = spec.MemberType;
- ResolveInstanceExpression (ec, null);
- if (!ec.HasSet (ResolveContext.Options.CompoundAssignmentScope)) {
- Error_AssignmentEventOnly (ec);
- }
- DoBestMemberChecks (ec, spec);
- return this;
- }
- public override void Emit (EmitContext ec)
- {
- throw new NotSupportedException ();
- //Error_CannotAssign ();
- }
- #region IAssignMethod Members
- public void Emit (EmitContext ec, bool leave_copy)
- {
- throw new NotImplementedException ();
- }
- public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
- {
- if (leave_copy || !isCompound)
- throw new NotImplementedException ("EventExpr::EmitAssign");
- Arguments args = new Arguments (1);
- args.Add (new Argument (source));
- // TODO: Wrong, needs receiver
- // if (NullShortCircuit) {
- // ec.ConditionalAccess = new ConditionalAccessContext (type, ec.DefineLabel ());
- // }
- var call = new CallEmitter ();
- call.InstanceExpression = InstanceExpression;
- call.ConditionalAccess = ConditionalAccess;
- call.EmitStatement (ec, op, args, loc);
- // if (NullShortCircuit)
- // ec.CloseConditionalAccess (null);
- }
- #endregion
- void Error_AssignmentEventOnly (ResolveContext ec)
- {
- if (spec.DeclaringType == ec.CurrentType || TypeManager.IsNestedChildOf (ec.CurrentType, spec.DeclaringType.MemberDefinition)) {
- ec.Report.Error (79, loc,
- "The event `{0}' can only appear on the left hand side of `+=' or `-=' operator",
- GetSignatureForError ());
- } else {
- ec.Report.Error (70, loc,
- "The event `{0}' can only appear on the left hand side of += or -= when used outside of the type `{1}'",
- GetSignatureForError (), spec.DeclaringType.GetSignatureForError ());
- }
- }
- protected override void Error_CannotCallAbstractBase (ResolveContext rc, string name)
- {
- name = name.Substring (0, name.LastIndexOf ('.'));
- base.Error_CannotCallAbstractBase (rc, name);
- }
- public override string GetSignatureForError ()
- {
- return TypeManager.CSharpSignature (spec);
- }
- public override void SetTypeArguments (ResolveContext ec, TypeArguments ta)
- {
- Error_TypeArgumentsCannotBeUsed (ec, "event", GetSignatureForError (), loc);
- }
- }
- public class TemporaryVariableReference : VariableReference
- {
- public class Declarator : Statement
- {
- TemporaryVariableReference variable;
- public Declarator (TemporaryVariableReference variable)
- {
- this.variable = variable;
- loc = variable.loc;
- }
- protected override void DoEmit (EmitContext ec)
- {
- variable.li.CreateBuilder (ec);
- }
- public override void Emit (EmitContext ec)
- {
- // Don't create sequence point
- DoEmit (ec);
- }
- protected override bool DoFlowAnalysis (FlowAnalysisContext fc)
- {
- return false;
- }
- protected override void CloneTo (CloneContext clonectx, Statement target)
- {
- // Nothing
- }
- }
- LocalVariable li;
- public TemporaryVariableReference (LocalVariable li, Location loc)
- {
- this.li = li;
- this.type = li.Type;
- this.loc = loc;
- }
- public override bool IsLockedByStatement {
- get {
- return false;
- }
- set {
- }
- }
- public LocalVariable LocalInfo {
- get {
- return li;
- }
- }
- public static TemporaryVariableReference Create (TypeSpec type, Block block, Location loc)
- {
- var li = LocalVariable.CreateCompilerGenerated (type, block, loc);
- return new TemporaryVariableReference (li, loc);
- }
- protected override Expression DoResolve (ResolveContext ec)
- {
- eclass = ExprClass.Variable;
- //
- // Don't capture temporary variables except when using
- // state machine redirection and block yields
- //
- if (ec.CurrentAnonymousMethod is StateMachineInitializer &&
- (ec.CurrentBlock.Explicit.HasYield || ec.CurrentBlock.Explicit.HasAwait) &&
- ec.IsVariableCapturingRequired) {
- AnonymousMethodStorey storey = li.Block.Explicit.CreateAnonymousMethodStorey (ec);
- storey.CaptureLocalVariable (ec, li);
- }
- return this;
- }
- public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
- {
- return Resolve (ec);
- }
-
- public override void Emit (EmitContext ec)
- {
- li.CreateBuilder (ec);
- Emit (ec, false);
- }
- public void EmitAssign (EmitContext ec, Expression source)
- {
- li.CreateBuilder (ec);
- EmitAssign (ec, source, false, false);
- }
- public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
- {
- return li.HoistedVariant;
- }
- public override bool IsFixed {
- get { return true; }
- }
- public override bool IsRef {
- get { return false; }
- }
- public override string Name {
- get { throw new NotImplementedException (); }
- }
- public override void SetHasAddressTaken ()
- {
- throw new NotImplementedException ();
- }
- protected override ILocalVariable Variable {
- get { return li; }
- }
- public override VariableInfo VariableInfo {
- get { return null; }
- }
- }
- ///
- /// Handles `var' contextual keyword; var becomes a keyword only
- /// if no type called var exists in a variable scope
- ///
- class VarExpr : SimpleName
- {
- public VarExpr (Location loc)
- : base ("var", loc)
- {
- }
- public bool InferType (ResolveContext ec, Expression right_side)
- {
- if (type != null)
- throw new InternalErrorException ("An implicitly typed local variable could not be redefined");
-
- type = right_side.Type;
- if (type == InternalType.NullLiteral || type.Kind == MemberKind.Void || type == InternalType.AnonymousMethod || type == InternalType.MethodGroup) {
- ec.Report.Error (815, loc,
- "An implicitly typed local variable declaration cannot be initialized with `{0}'",
- type.GetSignatureForError ());
- return false;
- }
- eclass = ExprClass.Variable;
- return true;
- }
- protected override void Error_TypeOrNamespaceNotFound (IMemberContext ec)
- {
- if (ec.Module.Compiler.Settings.Version < LanguageVersion.V_3)
- base.Error_TypeOrNamespaceNotFound (ec);
- else
- ec.Module.Compiler.Report.Error (825, loc, "The contextual keyword `var' may only appear within a local variable declaration");
- }
- }
-
- public class InvalidStatementExpression : Statement
- {
- public Expression Expression {
- get;
- private set;
- }
-
- public InvalidStatementExpression (Expression expr)
- {
- this.Expression = expr;
- }
-
- public override void Emit (EmitContext ec)
- {
- // nothing
- }
-
- protected override void DoEmit (EmitContext ec)
- {
- // nothing
- }
-
- protected override void CloneTo (CloneContext clonectx, Statement target)
- {
- // nothing
- }
-
- public override Mono.CSharp.Expression CreateExpressionTree (ResolveContext ec)
- {
- return null;
- }
-
- public override object Accept (Mono.CSharp.StructuralVisitor visitor)
- {
- return visitor.Visit (this);
- }
- protected override bool DoFlowAnalysis(FlowAnalysisContext fc)
- {
- return false;
- }
- }
- }