mirror of https://github.com/icsharpcode/ILSpy.git
4 changed files with 306 additions and 253 deletions
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// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System; |
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using System.Collections.Generic; |
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using ICSharpCode.Decompiler.Semantics; |
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using ICSharpCode.Decompiler.TypeSystem; |
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using ICSharpCode.Decompiler.TypeSystem.Implementation; |
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using SRM = System.Reflection.Metadata; |
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namespace ICSharpCode.Decompiler.Disassembler |
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{ |
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sealed class BlobDecoder |
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{ |
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SRM.BlobReader blob; |
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static readonly ITypeResolveContext context = new SimpleTypeResolveContext(MinimalCorlib.Instance.CreateCompilation()); |
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public BlobDecoder(SRM.BlobReader blob) |
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{ |
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this.blob = blob; |
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} |
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public int Offset => blob.Offset; |
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public ResolveResult ReadFixedArg(IType argType) |
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{ |
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if (argType.Kind == TypeKind.Array) { |
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if (((ArrayType)argType).Dimensions != 1) { |
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// Only single-dimensional arrays are supported
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return ErrorResolveResult.UnknownError; |
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} |
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IType elementType = ((ArrayType)argType).ElementType; |
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uint numElem = blob.ReadUInt32(); |
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if (numElem == 0xffffffff) { |
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// null reference
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return new ConstantResolveResult(argType, null); |
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} else { |
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ResolveResult[] elements = new ResolveResult[numElem]; |
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for (int i = 0; i < elements.Length; i++) { |
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elements[i] = ReadElem(elementType); |
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// Stop decoding when encountering an error:
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if (elements[i].IsError) |
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return ErrorResolveResult.UnknownError; |
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} |
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IType int32 = context.Compilation.FindType(KnownTypeCode.Int32); |
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ResolveResult[] sizeArgs = { new ConstantResolveResult(int32, elements.Length) }; |
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return new ArrayCreateResolveResult(argType, sizeArgs, elements); |
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} |
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} else { |
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return ReadElem(argType); |
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} |
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} |
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public ResolveResult ReadElem(IType elementType) |
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{ |
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ITypeDefinition underlyingType; |
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if (elementType.Kind == TypeKind.Enum) { |
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underlyingType = elementType.GetDefinition().EnumUnderlyingType.GetDefinition(); |
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} else { |
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underlyingType = elementType.GetDefinition(); |
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} |
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if (underlyingType == null) |
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return ErrorResolveResult.UnknownError; |
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KnownTypeCode typeCode = underlyingType.KnownTypeCode; |
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if (typeCode == KnownTypeCode.Object) { |
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// boxed value type
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IType boxedTyped = ReadCustomAttributeFieldOrPropType(); |
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ResolveResult elem = ReadFixedArg(boxedTyped); |
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if (elem.IsCompileTimeConstant && elem.ConstantValue == null) |
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return new ConstantResolveResult(elementType, null); |
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else |
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return new ConversionResolveResult(elementType, elem, Conversion.BoxingConversion); |
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} else if (typeCode == KnownTypeCode.Type) { |
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var type = ReadType(); |
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if (type != null) { |
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return new TypeOfResolveResult(underlyingType, type); |
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} else { |
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return new ConstantResolveResult(underlyingType, null); |
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} |
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} else { |
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return new ConstantResolveResult(elementType, ReadElemValue(typeCode)); |
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} |
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} |
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object ReadElemValue(KnownTypeCode typeCode) |
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{ |
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switch (typeCode) { |
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case KnownTypeCode.Boolean: |
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return blob.ReadBoolean(); |
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case KnownTypeCode.Char: |
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return blob.ReadChar(); |
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case KnownTypeCode.SByte: |
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return blob.ReadSByte(); |
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case KnownTypeCode.Byte: |
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return blob.ReadByte(); |
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case KnownTypeCode.Int16: |
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return blob.ReadInt16(); |
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case KnownTypeCode.UInt16: |
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return blob.ReadUInt16(); |
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case KnownTypeCode.Int32: |
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return blob.ReadInt32(); |
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case KnownTypeCode.UInt32: |
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return blob.ReadUInt32(); |
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case KnownTypeCode.Int64: |
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return blob.ReadInt64(); |
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case KnownTypeCode.UInt64: |
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return blob.ReadUInt64(); |
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case KnownTypeCode.Single: |
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return blob.ReadSingle(); |
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case KnownTypeCode.Double: |
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return blob.ReadDouble(); |
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case KnownTypeCode.String: |
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return blob.ReadSerializedString(); |
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default: |
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throw new NotSupportedException(); |
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} |
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} |
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public KeyValuePair<string, ResolveResult> ReadNamedArg() |
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{ |
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var b = blob.ReadByte(); |
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switch (b) { |
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case 0x53: |
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case 0x54: |
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break; |
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default: |
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throw new NotSupportedException(string.Format("Custom member type 0x{0:x} is not supported.", b)); |
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} |
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IType type = ReadCustomAttributeFieldOrPropType(); |
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string name = blob.ReadSerializedString(); |
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ResolveResult val = ReadFixedArg(type); |
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return new KeyValuePair<string, ResolveResult>(name, val); |
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} |
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IType ReadCustomAttributeFieldOrPropType() |
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{ |
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ICompilation compilation = context.Compilation; |
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var b = blob.ReadByte(); |
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switch (b) { |
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case 0x02: |
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return compilation.FindType(KnownTypeCode.Boolean); |
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case 0x03: |
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return compilation.FindType(KnownTypeCode.Char); |
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case 0x04: |
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return compilation.FindType(KnownTypeCode.SByte); |
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case 0x05: |
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return compilation.FindType(KnownTypeCode.Byte); |
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case 0x06: |
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return compilation.FindType(KnownTypeCode.Int16); |
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case 0x07: |
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return compilation.FindType(KnownTypeCode.UInt16); |
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case 0x08: |
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return compilation.FindType(KnownTypeCode.Int32); |
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case 0x09: |
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return compilation.FindType(KnownTypeCode.UInt32); |
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case 0x0a: |
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return compilation.FindType(KnownTypeCode.Int64); |
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case 0x0b: |
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return compilation.FindType(KnownTypeCode.UInt64); |
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case 0x0c: |
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return compilation.FindType(KnownTypeCode.Single); |
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case 0x0d: |
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return compilation.FindType(KnownTypeCode.Double); |
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case 0x0e: |
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return compilation.FindType(KnownTypeCode.String); |
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case 0x1d: |
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return new ArrayType(compilation, ReadCustomAttributeFieldOrPropType()); |
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case 0x50: |
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return compilation.FindType(KnownTypeCode.Type); |
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case 0x51: // boxed value type
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return compilation.FindType(KnownTypeCode.Object); |
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case 0x55: // enum
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var type = ReadType(); |
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if (type == null) { |
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throw new NotSupportedException("Enum type should not be null."); |
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} |
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return type; |
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default: |
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throw new NotSupportedException(string.Format("Custom attribute type 0x{0:x} is not supported.", b)); |
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} |
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} |
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IType ReadType() |
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{ |
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string typeName = blob.ReadSerializedString(); |
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if (typeName == null) { |
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return null; |
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} |
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ITypeReference typeReference = ReflectionHelper.ParseReflectionName(typeName); |
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IType typeInCurrentAssembly = typeReference.Resolve(context); |
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if (typeInCurrentAssembly.Kind != TypeKind.Unknown) |
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return typeInCurrentAssembly; |
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// look for the type in mscorlib
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ITypeDefinition systemObject = context.Compilation.FindType(KnownTypeCode.Object).GetDefinition(); |
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if (systemObject != null) { |
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return typeReference.Resolve(new SimpleTypeResolveContext(systemObject.ParentAssembly)); |
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} else { |
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// couldn't find corlib - return the unknown IType for the current assembly
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return typeInCurrentAssembly; |
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} |
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} |
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} |
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} |
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