Merge branch 'nmirror'

CoreObjectModel/MetadataHelper/Members.cs

@@ -3220,14 +3220,14 @@ namespace Microsoft.Cci.Immutable {
     /// True if the return value is passed by reference (using a managed pointer).
     /// </summary>
     public bool ReturnValueIsByRef {
-      get { return this.UnspecializedVersion.AcceptsExtraArguments; }
+      get { return this.UnspecializedVersion.ReturnValueIsByRef; }
     }
 
     /// <summary>
     /// True if the return value has one or more custom modifiers associated with it.
     /// </summary>
     public bool ReturnValueIsModified {
-      get { return this.UnspecializedVersion.AcceptsExtraArguments; }
+      get { return this.UnspecializedVersion.ReturnValueIsModified; }
     }
 
     /// <summary>

CoreObjectModel/MetadataHelper/TypeHelper.cs

@@ -2269,6 +2269,13 @@ namespace Microsoft.Cci {
       foreach (ITypeReference baseClass in type.BaseClasses) {
         if (TypeHelper.TypesAreEquivalent(baseClass, type.PlatformType.SystemAttribute, true)) return true;
       }
+
+      // If the type isn't directly derived from Attribute, its parent may be
+      foreach (ITypeReference baseClass in type.BaseClasses) { 
+        ITypeDefinition baseDef = baseClass.ResolvedType;
+        if (baseDef != null && IsAttributeType(baseDef)) return true;
+      }
+
       return false;
     }
 

CoreObjectModel/MetadataModel/DummyObjects.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Threading;
 using System.Diagnostics.Contracts;
+using Microsoft.Cci.MetadataReader.PEFileFlags;
 
 namespace Microsoft.Cci {
 
@@ -983,6 +984,10 @@ namespace Microsoft.Cci {
       get { return 0; }
     }
 
+    public COR20Flags COR20Flags {
+      get { return default(COR20Flags); }
+    }
+
     public bool ILOnly {
       get { return false; }
     }
@@ -3085,6 +3090,10 @@ namespace Microsoft.Cci {
       get { return 0; }
     }
 
+    public COR20Flags COR20Flags {
+      get { return default(COR20Flags); }
+    }
+
     public bool ILOnly {
       get { return false; }
     }

CoreObjectModel/MetadataModel/Units.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Diagnostics.Contracts;
 using System.Text;
 using System.Globalization;
+using Microsoft.Cci.MetadataReader.PEFileFlags;
 
 namespace Microsoft.Cci {
   /// <summary>
@@ -214,6 +215,10 @@ namespace Microsoft.Cci {
       throw new NotImplementedException();
     }
 
+    public COR20Flags COR20Flags {
+      get { throw new NotImplementedException(); }
+    }
+
     public bool ILOnly {
       get { throw new NotImplementedException(); }
     }
@@ -743,6 +748,10 @@ namespace Microsoft.Cci {
     /// </summary>
     M32R = 0x9041,
     /// <summary>
+    /// ARM64 Little-Endian
+    /// </summary>
+    ARM64 = 0xAA64,
+    /// <summary>
     /// CEE
     /// </summary>
     CEE = 0xC0EE,
@@ -843,6 +852,11 @@ namespace Microsoft.Cci {
     /// </summary>
     IEnumerable<ITypeMemberReference> GetTypeMemberReferences();
 
+    /// <summary>
+    /// Gets the set of COR flags applied to the module.
+    /// </summary>
+    COR20Flags COR20Flags { get; }
+
     /// <summary>
     /// True if the module contains only IL and is processor independent.
     /// </summary>
@@ -902,7 +916,7 @@ namespace Microsoft.Cci {
     /// <summary>
     /// A globally unique persistent identifier for this module.
     /// </summary>
-    System.Guid PersistentIdentifier { get; }
+    System.Guid PersistentIdentifier { get; }    
 
     /// <summary>
     /// If set, the module is platform independent but prefers to be loaded in a 32-bit process for performance reasons.
@@ -1089,6 +1103,10 @@ namespace Microsoft.Cci {
       throw new NotImplementedException();
     }
 
+    public COR20Flags COR20Flags {
+      get { throw new NotImplementedException(); }
+    }
+
     public bool ILOnly {
       get { throw new NotImplementedException(); }
     }

CoreObjectModel/MutableMetadataModel/Units.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+using Microsoft.Cci.MetadataReader.PEFileFlags;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.Contracts;
@@ -765,6 +766,7 @@ namespace Microsoft.Cci.MutableCodeModel {
         this.genericMethodInstances = new List<IGenericMethodInstanceReference>(genericMethodInstances);
       else
         this.genericMethodInstances = null;
+      this.cor20Flags = module.COR20Flags;
       this.ilOnly = module.ILOnly;
       this.strongNameSigned = module.StrongNameSigned;
       this.prefers32bits = module.Prefers32bits;
@@ -937,6 +939,12 @@ namespace Microsoft.Cci.MutableCodeModel {
     }
     List<IGenericMethodInstanceReference>/*?*/ genericMethodInstances;
 
+    public COR20Flags COR20Flags {
+      get { return this.cor20Flags; }
+      set { this.cor20Flags = value; }
+    }
+    COR20Flags cor20Flags;
+
     /// <summary>
     /// True if the module contains only IL and is processor independent.
     /// </summary>

CoreObjectModel/SourceModel/Interfaces.cs

@@ -1540,6 +1540,31 @@ namespace Microsoft.Cci {
   }
   #endregion
 
+  /// <summary>
+  /// An object that can retrieve the source link information embedded in a PDB file.
+  /// For example, a PDB reader that can read the source link information
+  /// </summary>
+  [ContractClass(typeof(ISourceLinkProviderContract))]
+  public interface ISourceLinkProvider {
+    /// <summary>
+    /// Return the source link data as a byte array or null if there is no source link information embedded
+    /// </summary>
+    IEnumerable<byte> GetSourceLinkData();
+  }
+
+  #region ISourceLinkProvider contract binding
+  [ContractClassFor(typeof(ISourceLinkProvider))]
+  abstract class ISourceLinkProviderContract : ISourceLinkProvider {
+    #region ISourceLinkProvider Members
+
+    public IEnumerable<byte> GetSourceLinkData() {
+      throw new NotImplementedException();
+    }
+
+    #endregion
+  }
+  #endregion
+
   /// <summary>
   /// A range of CLR IL operations that comprise a lexical scope, specified as an IL offset and a length.
   /// </summary>

Microsoft.Cci.csproj

@@ -70,7 +70,10 @@
     <Reference Include="System.IO" />
     <Reference Include="System.Reflection.Metadata" />
     <Reference Include="System.Runtime" />
-    <Reference Include="Microsoft.DiaSymReader.Converter" />
+    <ReferencePath Include="$(SupportAssemblyPath)\Microsoft.DiaSymReader.dll" />
+    <Reference Include="Microsoft.DiaSymReader.Converter">
+      <Aliases>DiaSymReaderPdbConverter</Aliases>
+    </Reference>
   </ItemGroup>
   <ItemGroup Condition="'$(EnablePortablePdb)' == 'true'">
     <Content Include="$(PortablePdbConverterPath)\Microsoft.DiaSymReader.Converter.dll" />

PDBReaderAndWriter/PdbReader/PdbFile.cs

@@ -9,6 +9,12 @@ using System.IO;
 namespace Microsoft.Cci.Pdb {
 
   internal class PdbFile {
+
+    /// <summary>
+    /// GUID of the Basic source language.
+    /// </summary>
+    private static readonly Guid BasicLanguageGuid = new Guid(974311608, -15764, 4560, 180, 66, 0, 160, 36, 74, 29, 210);
+
     private PdbFile()   // This class can't be instantiated.
     {
     }
@@ -220,6 +226,11 @@ namespace Microsoft.Cci.Pdb {
                 bits.ReadUInt32(out file.linsiz);   // Size of payload.
 
                 PdbSource src = (PdbSource)checks[(int)file.index];
+                if (src.language.Equals(BasicLanguageGuid))
+                {
+                  func.AdjustVisualBasicScopes();
+                }
+
                 PdbLines tmp = new PdbLines(src, file.count);
                 func.lines[block++] = tmp;
                 PdbLine[] lines = tmp.lines;
@@ -349,7 +360,7 @@ namespace Microsoft.Cci.Pdb {
 
     internal static PdbInfo LoadFunctions(Stream read) {
       PdbInfo pdbInfo = new PdbInfo();
-      
+
       pdbInfo.TokenToSourceMapping = new Dictionary<uint, PdbTokenLine>();
       BitAccess bits = new BitAccess(64 * 1024);
       PdbFileHeader head = new PdbFileHeader(read, bits);
@@ -378,6 +389,14 @@ namespace Microsoft.Cci.Pdb {
         pdbInfo.SourceServerData = bits.ReadBString(bytes.Length);
       }
 
+      int sourceLinkStream;
+      if (nameIndex.TryGetValue("SOURCELINK", out sourceLinkStream)) {
+        DataStream dataStream = dir.streams[sourceLinkStream];
+        pdbInfo.SourceLinkData = new byte[dataStream.contentSize];
+        dataStream.Read(reader, bits);
+        bits.ReadBytes(pdbInfo.SourceLinkData);
+      }
+
       dir.streams[3].Read(reader, bits);
       LoadDbiStream(bits, out modules, out header, true);
 

PDBReaderAndWriter/PdbReader/PdbFormatProvider.cs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft. All rights reserved.
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
+extern alias DiaSymReaderPdbConverter;
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.Contracts;
@@ -11,8 +13,8 @@ using System.Reflection.Metadata;
 using System.Reflection.Metadata.Ecma335;
 using System.Reflection.PortableExecutable;
 
-using Microsoft.DiaSymReader.PortablePdb;
-using Microsoft.DiaSymReader.Tools;
+using DiaSymReaderPdbConverter::Microsoft.DiaSymReader.PortablePdb;
+using DiaSymReaderPdbConverter::Microsoft.DiaSymReader.Tools;
 
 namespace Microsoft.Cci.Pdb {
   /// <summary>
@@ -43,13 +45,13 @@ namespace Microsoft.Cci.Pdb {
             {
               // Load associated portable PDB
               PdbWriterForCci cciWriter = new PdbWriterForCci();
-  
-              new PdbConverter().ConvertPortableToWindows<int>(
+
+              new PdbConverter().ConvertPortableToWindows(
                 peReader,
                 pdbReaderProvider.GetMetadataReader(),
                 cciWriter,
                 PdbConversionOptions.SuppressSourceLinkConversion);
-  
+
               PdbInfo pdbInfo = new PdbInfo()
               {
                 Functions = cciWriter.Functions,
@@ -57,9 +59,10 @@ namespace Microsoft.Cci.Pdb {
                 Age = cciWriter.Age,
                 Guid = cciWriter.Guid,
                 // Ignored for portable PDBs to avoid bringing in a dependency on Newtonsoft.Json
-                SourceServerData = null
+                SourceServerData = null,
+                SourceLinkData = cciWriter.SourceLinkData
               };
-  
+
               return pdbInfo;
             }
           }
@@ -86,7 +89,7 @@ namespace Microsoft.Cci.Pdb {
     /// The basic idea of the portable PDB conversion is that we let the converter run
     /// and use this PdbWriterForCci class to construct the CCI-expected data structures.
     /// </summary>
-    class PdbWriterForCci : Microsoft.DiaSymReader.PdbWriter<int>
+    class PdbWriterForCci : Microsoft.DiaSymReader.SymUnmanagedWriter
     {
       /// <summary>
       /// List of functions exposed by the PDB.
@@ -108,6 +111,11 @@ namespace Microsoft.Cci.Pdb {
       /// </summary>
       public Guid Guid { get; private set; }
 
+      /// <summary>
+      /// Raw source link data
+      /// </summary>
+      public byte[] SourceLinkData { get; private set; }
+
       /// <summary>
       /// List of previously defined PdbSource documents
       /// </summary>
@@ -158,7 +166,7 @@ namespace Microsoft.Cci.Pdb {
       /// Define an indexed document to be subsequently referred to by sequence points.
       /// </summary>
       /// <returns>Document index that the converter will subsequently pass to DefineSequencePoints</returns>
-      public override int DefineDocument(string name, Guid language, Guid vendor, Guid type, Guid algorithmId, byte[] checksum)
+      public override int DefineDocument(string name, Guid language, Guid vendor, Guid type, Guid algorithmId, byte[] checksum, byte[] source)
       {
         int documentIndex = _sourceDocuments.Count;
         _sourceDocuments.Add(new PdbSource(
@@ -267,7 +275,7 @@ namespace Microsoft.Cci.Pdb {
       public override void CloseMethod()
       {
         Contract.Assert(_currentMethod != null);
-        
+
         List<PdbLines> documentLineSets = new List<PdbLines>();
         foreach (KeyValuePair<int, List<PdbLine>> tokenLinePair in _linesForCurrentMethod)
         {
@@ -332,7 +340,7 @@ namespace Microsoft.Cci.Pdb {
       /// <param name="name">Variable name</param>
       /// <param name="attributes">Variable properties</param>
       /// <param name="localSignatureToken">Signature token representing the variable type</param>
-      public override void DefineLocalVariable(int index, string name, LocalVariableAttributes attributes, int localSignatureToken)
+      public override void DefineLocalVariable(int index, string name, int attributes, int localSignatureToken)
       {
         Contract.Assert(_currentScope != null);
 
@@ -351,7 +359,7 @@ namespace Microsoft.Cci.Pdb {
       /// <param name="name">Constant name</param>
       /// <param name="value">Constant value</param>
       /// <param name="constantSignatureToken">Signature token representing the constant type</param>
-      public override void DefineLocalConstant(string name, object value, int constantSignatureToken)
+      public override bool DefineLocalConstant(string name, object value, int constantSignatureToken)
       {
         Contract.Assert(_currentScope != null);
 
@@ -361,9 +369,13 @@ namespace Microsoft.Cci.Pdb {
             name: name,
             token: (uint)constantSignatureToken,
             value: value);
-  
+
           _currentScope.AddConstant(pdbConstant);
+
+          return true;
         }
+
+        return false;
       }
 
       /// <summary>
@@ -412,6 +424,77 @@ namespace Microsoft.Cci.Pdb {
       }
 
       public override void SetSourceLinkData(byte[] sourceLinkData)
+      {
+        SourceLinkData = sourceLinkData;
+      }
+
+      public override void Dispose()
+      {
+        // NO-OP for CCI
+      }
+
+      /// <summary>
+      /// Gets the current PDB signature.
+      /// </summary>
+      public override void GetSignature(out Guid guid, out uint stamp, out int age)
+      {
+        guid = Guid;
+        age = Age;
+        stamp = 0;
+      }
+
+      /// <summary>
+      /// Gets the raw data blobs that comprise the written PDB content so far.
+      /// </summary>
+      public override IEnumerable<ArraySegment<byte>> GetUnderlyingData()
+      {
+        // NO-OP for CCI
+        return null;
+      }
+
+      public override int DocumentTableCapacity
+      {
+        get => _sourceDocuments.Capacity;
+
+        set
+        {
+          if (value > _sourceDocuments.Count)
+          {
+            _sourceDocuments.Capacity = value;
+          }
+        }
+      }
+
+      /// <summary>
+      /// Opens a map of tokens to source spans.
+      /// </summary>
+      public override void OpenTokensToSourceSpansMap()
+      {
+        // NO-OP for CCI
+      }
+
+      /// <summary>
+      /// Maps specified token to a source span.
+      /// </summary>
+      public override void MapTokenToSourceSpan(int token, int documentIndex, int startLine, int startColumn, int endLine, int endColumn)
+      {
+        // NO-OP for CCI
+      }
+
+      /// <summary>
+      /// Closes map of tokens to source spans previously opened using <see cref="M:Microsoft.DiaSymReader.SymUnmanagedWriter.OpenTokensToSourceSpansMap" />.
+      /// </summary>
+      public override void CloseTokensToSourceSpansMap()
+      {
+        // NO-OP for CCI
+      }
+
+      /// <summary>
+      /// Writes the PDB data to specified stream. Once called no more changes to the data can be made using this writer.
+      /// May be called multiple times. Always writes the same data.
+      /// </summary>
+      /// <param name="stream">Stream to write PDB data to.</param>
+      public override void WriteTo(Stream stream)
       {
         // NO-OP for CCI
       }
@@ -430,27 +513,27 @@ namespace Microsoft.Cci.Pdb {
         /// Starting IL offset for the scope gets initialized in the constructor.
         /// </summary>
         private readonly uint _startOffset;
-        
+
         /// <summary>
         /// Lazily constructed list of child scopes.
         /// </summary>
         private List<PdbScope> _childScopes;
-        
+
         /// <summary>
         /// Lazily constructed list of per-scope constants.
         /// </summary>
         private List<PdbConstant> _constants;
-        
+
         /// <summary>
         /// Lazily constructed list of 'using' namespaces within the scope.
         /// </summary>
         private List<string> _usedNamespaces;
-        
+
         /// <summary>
         /// Lazily constructed list of slots (local variables).
         /// </summary>
         private List<PdbSlot> _slots;
-        
+
         /// <summary>
         /// Constructor stores the starting IL offset for the scope.
         /// </summary>
@@ -461,7 +544,7 @@ namespace Microsoft.Cci.Pdb {
           _constants = new List<PdbConstant>();
           _slots = new List<PdbSlot>();
         }
-        
+
         /// <summary>
         /// Finalize construction of the PdbScope and return the complete PdbScope object.
         /// </summary>
@@ -478,7 +561,7 @@ namespace Microsoft.Cci.Pdb {
           scope.scopes = _childScopes.ToArray();
           return scope;
         }
-        
+
         /// <summary>
         /// Add a scope to the list of immediate child scopes of this scope.
         /// </summary>
@@ -487,7 +570,7 @@ namespace Microsoft.Cci.Pdb {
         {
           _childScopes.Add(childScope);
         }
-        
+
         /// <summary>
         /// Add a slot (local variable) to the list of slots for this scope.
         /// </summary>
@@ -496,7 +579,7 @@ namespace Microsoft.Cci.Pdb {
         {
           _slots.Add(slot);
         }
-        
+
         /// <summary>
         /// Add a constant to the list of constants available within this scope.
         /// </summary>
@@ -505,7 +588,7 @@ namespace Microsoft.Cci.Pdb {
         {
           _constants.Add(pdbConstant);
         }
-        
+
         /// <summary>
         /// Add a used namespace to the list of namespaces used by this scope.
         /// </summary>

PDBReaderAndWriter/PdbReader/PdbFunction.cs

@@ -38,6 +38,13 @@ namespace Microsoft.Cci.Pdb {
     internal List<ILocalScope>/*?*/ iteratorScopes;
     internal PdbSynchronizationInformation/*?*/ synchronizationInformation;
 
+    /// <summary>
+    /// Flag saying whether the method has been identified as a product of VB compilation using
+    /// the legacy Windows PDB symbol format, in which case scope ends need to be shifted by 1
+    /// due to different semantics of scope limits in VB and C# compilers.
+    /// </summary>
+    private bool visualBasicScopesAdjusted = false;
+
     private static string StripNamespace(string module) {
       int li = module.LastIndexOf('.');
       if (li > 0) {
@@ -46,6 +53,36 @@ namespace Microsoft.Cci.Pdb {
       return module;
     }
 
+    /// <summary>
+    /// When the Windows PDB reader identifies a PdbFunction as having 'Basic' as its source language,
+    /// it calls this method which adjusts all scopes by adding 1 to their lengths to compensate
+    /// for different behavior of VB vs. the C# compiler w.r.t. emission of scope info.
+    /// </summary>
+    internal void AdjustVisualBasicScopes()
+    {
+      if (!visualBasicScopesAdjusted)
+      {
+        visualBasicScopesAdjusted = true;
+
+        // Don't adjust root scope as that one is correct
+        foreach (PdbScope scope in scopes)
+        {
+          AdjustVisualBasicScopes(scope.scopes);
+        }
+      }
+    }
+
+    /// <summary>
+    /// Recursively update the entire scope tree by adding 1 to the length of each scope.
+    /// </summary>
+    private void AdjustVisualBasicScopes(PdbScope[] scopes)
+    {
+      foreach (PdbScope scope in scopes)
+      {
+        scope.length++;
+        AdjustVisualBasicScopes(scope.scopes);
+      }
+    }
 
     internal static PdbFunction[] LoadManagedFunctions(/*string module,*/
                                                        BitAccess bits, uint limit,

PDBReaderAndWriter/PdbReader/PdbInfo.cs

@@ -36,5 +36,10 @@ namespace Microsoft.Cci {
     /// GUID of the PDB file is used to match the PDB against the PE binary.
     /// </summary>
     public Guid Guid;
+
+    /// <summary>
+    /// Source link data information.
+    /// </summary>
+    public byte[] SourceLinkData;
   }
 }

PDBReaderAndWriter/PdbReader/SourceLocationProvider.cs

@@ -16,7 +16,7 @@ namespace Microsoft.Cci {
   /// <summary>
   /// An object that can map offsets in an IL stream to source locations and block scopes.
   /// </summary>
-  public class PdbReader : ISourceLocationProvider, ILocalScopeProvider, IDisposable {
+  public class PdbReader : ISourceLocationProvider, ILocalScopeProvider, ISourceLinkProvider, IDisposable {
 
     IMetadataHost host;
     Dictionary<uint, PdbFunction> pdbFunctionMap = new Dictionary<uint, PdbFunction>();
@@ -121,6 +121,10 @@ namespace Microsoft.Cci {
         .Distinct();
     }
 
+    public IEnumerable<byte> GetSourceLinkData() {
+      return pdbInfo.SourceLinkData;
+    }
+
     /// <summary>
     /// Return zero or more locations in primary source documents that correspond to one or more of the given derived (non primary) document locations.
     /// </summary>
@@ -274,7 +278,7 @@ namespace Microsoft.Cci {
     }
 
     /// <summary>
-    /// 
+    ///
     /// </summary>
     /// <param name="localDefinition"></param>
     /// <param name="isCompilerGenerated"></param>
@@ -416,7 +420,7 @@ namespace Microsoft.Cci {
       if (pdbLocalScope == null) yield break;
       foreach (PdbSlot slot in pdbLocalScope.pdbScope.slots) {
         if ((slot.flags & 1) != 0) continue;
-        if (slot.slot == 0 && slot.name.StartsWith("$VB")) 
+        if (slot.slot == 0 && slot.name.StartsWith("$VB"))
           yield return new PdbLocalVariable(slot, this.host, pdbLocalScope.methodBody.MethodDefinition);
         uint index = 0;
         foreach (ILocalDefinition localDefinition in pdbLocalScope.methodBody.LocalVariables) {
@@ -727,7 +731,7 @@ namespace Microsoft.Cci.Pdb {
   internal sealed class PdbSourceDocument : PrimarySourceDocument {
 
     /// <summary>
-    /// Allocates an object that represents a source document, such as file, which is parsed according to the rules of a particular langauge, 
+    /// Allocates an object that represents a source document, such as file, which is parsed according to the rules of a particular langauge,
     /// such as C#, to produce an object model.
     /// </summary>
     /// <param name="name">The name of the document. Used to identify the document in user interaction.</param>
@@ -739,7 +743,7 @@ namespace Microsoft.Cci.Pdb {
     }
 
     /// <summary>
-    /// Allocates an object that represents a source document, such as file, which is parsed according to the rules of a particular langauge, 
+    /// Allocates an object that represents a source document, such as file, which is parsed according to the rules of a particular langauge,
     /// such as C#, to produce an object model.
     /// </summary>
     /// <param name="name">The name of the document. Used to identify the document in user interaction.</param>

PEReaderAndWriter/PEReader/BinaryObjectModel.cs

@@ -435,6 +435,10 @@ namespace Microsoft.Cci.MetadataReader.ObjectModelImplementation {
       get { return this.PEFileToObjectModel.PEFileReader.FileAlignment; }
     }
 
+    COR20Flags IModule.COR20Flags { 
+      get { return this.Cor20Flags; }
+    }
+
     bool IModule.ILOnly {
       get { return (this.Cor20Flags & COR20Flags.ILOnly) == COR20Flags.ILOnly; }
     }

PEReaderAndWriter/PEReader/PEFileStructures.cs

@@ -147,7 +147,7 @@ namespace Microsoft.Cci.MetadataReader.PEFileFlags {
     MemWrite = 0x80000000,        // Section is writeable.
   }
 
-  internal enum COR20Flags : uint {
+  public enum COR20Flags : uint {
     ILOnly = 0x00000001,
     Bit32Required = 0x00000002,
     ILLibrary = 0x00000004,