C# CSharp.Location类代码示例

			public FieldSpec DefineInitializedData (byte[] data, Location loc)
			{
				Struct size_type;
				if (!size_types.TryGetValue (data.Length, out size_type)) {
					//
					// Build common type for this data length. We cannot use
					// DefineInitializedData because it creates public type,
					// and its name is not unique among modules
					//
					size_type = new Struct (this, new MemberName ("$ArrayType=" + data.Length, loc), Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED, null);
					size_type.CreateContainer ();
					size_type.DefineContainer ();

					size_types.Add (data.Length, size_type);

					// It has to work even if StructLayoutAttribute does not exist
					size_type.TypeBuilder.__SetLayout (1, data.Length);
				}

				var name = "$field-" + fields.ToString ("X");
				++fields;
				const Modifiers fmod = Modifiers.STATIC | Modifiers.INTERNAL;
				var fbuilder = TypeBuilder.DefineField (name, size_type.CurrentType.GetMetaInfo (), ModifiersExtensions.FieldAttr (fmod) | FieldAttributes.HasFieldRVA);
				fbuilder.__SetDataAndRVA (data);

				return new FieldSpec (CurrentType, null, size_type.CurrentType, fbuilder, fmod);
			}

		public static TypeSpec CreateDelegateType (ResolveContext rc, AParametersCollection parameters, TypeSpec returnType, Location loc)
		{
			Namespace type_ns = rc.Module.GlobalRootNamespace.GetNamespace ("System", true);
			if (type_ns == null) {
				return null;
			}
			if (returnType == rc.BuiltinTypes.Void) {
				var actArgs = parameters.Types;
				var actionSpec = type_ns.LookupType (rc.Module, "Action", actArgs.Length, LookupMode.Normal, loc).ResolveAsType(rc);
				if (actionSpec == null) {
					return null;
				}
				if (actArgs.Length == 0)
					return actionSpec;
				else
					return actionSpec.MakeGenericType(rc, actArgs);
			} else {
				TypeSpec[] funcArgs = new TypeSpec[parameters.Types.Length + 1];
				parameters.Types.CopyTo(funcArgs, 0);
				funcArgs[parameters.Types.Length] = returnType;
				var funcSpec = type_ns.LookupType (rc.Module, "Func", funcArgs.Length, LookupMode.Normal, loc).ResolveAsType(rc);
				if (funcSpec == null)
					return null;
				return funcSpec.MakeGenericType(rc, funcArgs);
			}
		}

		public virtual Type LookupTypeReflection (CompilerContext ctx, string name, Location loc, bool must_be_unique)
		{
			Type found_type = null;

			foreach (Assembly a in referenced_assemblies) {
				Type t = GetTypeInAssembly (a, name);
				if (t == null)
					continue;

				if (!must_be_unique)
					return t;

				if (found_type == null) {
					found_type = t;
					continue;
				}

				// When type is forwarded
				if (t.Assembly == found_type.Assembly)
					continue;					

				ctx.Report.SymbolRelatedToPreviousError (found_type);
				ctx.Report.SymbolRelatedToPreviousError (t);
				if (loc.IsNull) {
					Error_AmbiguousPredefinedType (ctx, loc, name, found_type);
				} else {
					ctx.Report.Error (433, loc, "The imported type `{0}' is defined multiple times", name);
				}

				return found_type;
			}

			return found_type;
		}

		public static FlowBranching CreateBranching (FlowBranching parent, BranchingType type, Block block, Location loc)
		{
			switch (type) {
			case BranchingType.Exception:
			case BranchingType.Labeled:
			case BranchingType.Toplevel:
			case BranchingType.TryCatch:
				throw new InvalidOperationException ();

			case BranchingType.Switch:
				return new FlowBranchingBreakable (parent, type, SiblingType.SwitchSection, block, loc);

			case BranchingType.Block:
				return new FlowBranchingBlock (parent, type, SiblingType.Block, block, loc);

			case BranchingType.Loop:
				return new FlowBranchingBreakable (parent, type, SiblingType.Conditional, block, loc);

			case BranchingType.Embedded:
				return new FlowBranchingContinuable (parent, type, SiblingType.Conditional, block, loc);

			default:
				return new FlowBranchingBlock (parent, type, SiblingType.Conditional, block, loc);
			}
		}

		public DynamicTypeExpr (Location loc)
		{
			this.loc = loc;

			type = InternalType.Dynamic;
			eclass = ExprClass.Type;
		}

		public MemberName (string name, TypeParameters tparams, Location loc)
		{
			this.Name = name;
			this.Location = loc;

			this.TypeParameters = tparams;
		}

		private MemberName (MemberName left, string name, bool is_double_colon,
				    TypeArguments args, Location loc)
			: this (left, name, is_double_colon, loc)
		{
			if (args != null && args.Count > 0)
				this.TypeArguments = args;
		}

		public void FeatureIsNotAvailable (CompilerContext compiler, Location loc, string feature)
		{
			string version;
			switch (compiler.Settings.Version) {
			case LanguageVersion.ISO_1:
				version = "1.0";
				break;
			case LanguageVersion.ISO_2:
				version = "2.0";
				break;
			case LanguageVersion.V_3:
				version = "3.0";
				break;
			case LanguageVersion.V_4:
				version = "4.0";
				break;
			case LanguageVersion.V_5:
				version = "5.0";
				break;
			default:
				throw new InternalErrorException ("Invalid feature version", compiler.Settings.Version);
			}

			Error (1644, loc,
				"Feature `{0}' cannot be used because it is not part of the C# {1} language specification",
				      feature, version);
		}

        /// <summary>
        ///   Performs an explicit conversion of the expression `expr' whose
        ///   type is expr.Type to `target_type'.
        /// </summary>
        public static Expression ExplicitConversion(ResolveContext ec, Expression expr,
			TypeSpec target_type, Location loc)
        {
            Expression e = ExplicitConversionCore (ec, expr, target_type, loc);
            if (e != null) {
                //
                // Don't eliminate explicit precission casts
                //
                if (e == expr) {
                    if (target_type.BuiltinType == BuiltinTypeSpec.Type.Float)
                        return new OpcodeCast (expr, target_type, OpCodes.Conv_R4);

                    if (target_type.BuiltinType == BuiltinTypeSpec.Type.Double)
                        return new OpcodeCast (expr, target_type, OpCodes.Conv_R8);
                }

                return e;
            }

            TypeSpec expr_type = expr.Type;
            if (target_type.IsNullableType) {
                TypeSpec target;

                if (expr_type.IsNullableType) {
                    target = Nullable.NullableInfo.GetUnderlyingType (target_type);
                    Expression unwrap = Nullable.Unwrap.Create (expr);
                    e = ExplicitConversion (ec, unwrap, target, expr.Location);
                    if (e == null)
                        return null;

                    return new Nullable.LiftedConversion (e, unwrap, target_type).Resolve (ec);
                }
                if (expr_type.BuiltinType == BuiltinTypeSpec.Type.Object) {
                    return new UnboxCast (expr, target_type);
                }

                target = TypeManager.GetTypeArguments (target_type) [0];
                e = ExplicitConversionCore (ec, expr, target, loc);
                if (e != null)
                    return TypeSpec.IsReferenceType (expr.Type) ? new UnboxCast (expr, target_type) : Nullable.Wrap.Create (e, target_type);
            } else if (expr_type.IsNullableType) {
                e = ImplicitBoxingConversion (expr, Nullable.NullableInfo.GetUnderlyingType (expr_type), target_type);
                if (e != null)
                    return e;

                e = Nullable.Unwrap.Create (expr, false);
                e = ExplicitConversionCore (ec, e, target_type, loc);
                if (e != null)
                    return EmptyCast.Create (e, target_type);
            }

            e = ExplicitUserConversion (ec, expr, target_type, loc);

            if (e != null)
                return e;

            expr.Error_ValueCannotBeConverted (ec, target_type, true);
            return null;
        }

		public Const (DeclSpace parent, FullNamedExpression type, string name,
			      Expression expr, int mod_flags, Attributes attrs, Location loc)
			: base (parent, type, mod_flags, AllowedModifiers,
				new MemberName (name, loc), attrs)
		{
			initializer = expr;
			ModFlags |= Modifiers.STATIC;
		}

        public BoolConstant(TypeSpec type, bool val, Location loc)
            : base(loc)
        {
            eclass = ExprClass.Value;
            this.type = type;

            Value = val;
        }

 public Accessor(ToplevelBlock b, Modifiers mod, Attributes attrs, ParametersCompiled p, Location loc)
 {
     Block = b;
     Attributes = attrs;
     Location = loc;
     Parameters = p;
     ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, 0, loc, RootContext.ToplevelTypes.Compiler.Report);
 }

		public MemberName (string name, TypeArguments args, Location loc)
		{
			this.Name = name;
			this.Location = loc;

			if (args != null && args.Count > 0)
				this.TypeArguments = args;
		}

		public Constant ImplicitConversionRequired (ResolveContext ec, TypeSpec type, Location loc)
		{
			Constant c = ConvertImplicitly (type);
			if (c == null)
				Error_ValueCannotBeConverted (ec, type, false);

			return c;
		}

		public ReturnParameter (MethodBuilder mb, Location location)
		{
			try {
				builder = mb.DefineParameter (0, ParameterAttributes.None, "");			
			}
			catch (ArgumentOutOfRangeException) {
				RootContext.ToplevelTypes.Compiler.Report.RuntimeMissingSupport (location, "custom attributes on the return type");
			}
		}