/// <summary> /// Try to look up field access info for given canon in metadata blobs for all available modules. /// </summary> /// <param name="metadataReader">Metadata reader for the declaring type</param> /// <param name="declaringTypeHandle">Declaring type for the method</param> /// <param name="fieldHandle">Field handle</param> /// <param name="canonFormKind">Canonical form to use</param> /// <param name="fieldAccessMetadata">Output - metadata information for field accessor construction</param> /// <returns>true when found, false otherwise</returns> private static unsafe bool TryGetFieldAccessMetadataFromFieldAccessMap( MetadataReader metadataReader, RuntimeTypeHandle declaringTypeHandle, FieldHandle fieldHandle, CanonicalFormKind canonFormKind, ref FieldAccessMetadata fieldAccessMetadata) { CanonicallyEquivalentEntryLocator canonWrapper = new CanonicallyEquivalentEntryLocator(declaringTypeHandle, canonFormKind); string fieldName = null; RuntimeTypeHandle declaringTypeHandleDefinition = TypeLoaderEnvironment.GetTypeDefinition(declaringTypeHandle); foreach (NativeFormatModuleInfo mappingTableModule in ModuleList.EnumerateModules(RuntimeAugments.GetModuleFromTypeHandle(declaringTypeHandle))) { NativeReader fieldMapReader; if (!TryGetNativeReaderForBlob(mappingTableModule, ReflectionMapBlob.FieldAccessMap, out fieldMapReader)) { continue; } NativeParser fieldMapParser = new NativeParser(fieldMapReader, 0); NativeHashtable fieldHashtable = new NativeHashtable(fieldMapParser); ExternalReferencesTable externalReferences = default(ExternalReferencesTable); if (!externalReferences.InitializeCommonFixupsTable(mappingTableModule)) { continue; } var lookup = fieldHashtable.Lookup(canonWrapper.LookupHashCode); NativeParser entryParser; while (!(entryParser = lookup.GetNext()).IsNull) { // Grammar of a hash table entry: // Flags + DeclaringType + MdHandle or Name + Cookie or Ordinal or Offset FieldTableFlags entryFlags = (FieldTableFlags)entryParser.GetUnsigned(); if ((canonFormKind == CanonicalFormKind.Universal) != ((entryFlags & FieldTableFlags.IsUniversalCanonicalEntry) != 0)) { continue; } RuntimeTypeHandle entryDeclaringTypeHandle = externalReferences.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned()); if (!entryDeclaringTypeHandle.Equals(declaringTypeHandle) && !canonWrapper.IsCanonicallyEquivalent(entryDeclaringTypeHandle)) { continue; } if ((entryFlags & FieldTableFlags.HasMetadataHandle) != 0) { Handle entryFieldHandle = (((int)HandleType.Field << 24) | (int)entryParser.GetUnsigned()).AsHandle(); if (!fieldHandle.Equals(entryFieldHandle)) { continue; } } else { if (fieldName == null) { QTypeDefinition qTypeDefinition; bool success = Instance.TryGetMetadataForNamedType( declaringTypeHandleDefinition, out qTypeDefinition); Debug.Assert(success); MetadataReader nativeFormatMetadataReader = qTypeDefinition.NativeFormatReader; fieldName = nativeFormatMetadataReader.GetString(fieldHandle.GetField(nativeFormatMetadataReader).Name); } string entryFieldName = entryParser.GetString(); if (fieldName != entryFieldName) { continue; } } int fieldOffset; IntPtr fieldAddressCookie = IntPtr.Zero; if (canonFormKind == CanonicalFormKind.Universal) { if (!TypeLoaderEnvironment.Instance.TryGetFieldOffset(declaringTypeHandle, entryParser.GetUnsigned() /* field ordinal */, out fieldOffset)) { Debug.Assert(false); return(false); } } else { if ((entryFlags & FieldTableFlags.FieldOffsetEncodedDirectly) != 0) { fieldOffset = (int)entryParser.GetUnsigned(); } else { fieldOffset = 0; fieldAddressCookie = externalReferences.GetAddressFromIndex(entryParser.GetUnsigned()); FieldTableFlags storageClass = entryFlags & FieldTableFlags.StorageClass; if (storageClass == FieldTableFlags.GCStatic || storageClass == FieldTableFlags.ThreadStatic) { fieldOffset = (int)entryParser.GetUnsigned(); } } } fieldAccessMetadata.MappingTableModule = mappingTableModule.Handle; fieldAccessMetadata.Cookie = fieldAddressCookie; fieldAccessMetadata.Flags = entryFlags; fieldAccessMetadata.Offset = fieldOffset; return(true); } } return(false); }
/// <summary> /// Try to look up non-gc/gc static effective field bases for a non-generic non-dynamic type. /// </summary> /// <param name="declaringTypeHandle">Declaring type for the method</param> /// <param name="fieldAccessKind">type of static base to find</param> /// <param name="staticsRegionAddress">Output - statics region address info</param> /// <returns>true when found, false otherwise</returns> private static unsafe bool TryGetStaticFieldBaseFromFieldAccessMap( RuntimeTypeHandle declaringTypeHandle, FieldAccessStaticDataKind fieldAccessKind, out IntPtr staticsRegionAddress) { staticsRegionAddress = IntPtr.Zero; CanonicallyEquivalentEntryLocator canonWrapper = new CanonicallyEquivalentEntryLocator(declaringTypeHandle, CanonicalFormKind.Specific); // This function only finds results for non-dynamic, non-generic types if (RuntimeAugments.IsDynamicType(declaringTypeHandle) || RuntimeAugments.IsGenericType(declaringTypeHandle)) { return(false); } foreach (NativeFormatModuleInfo mappingTableModule in ModuleList.EnumerateModules(RuntimeAugments.GetModuleFromTypeHandle(declaringTypeHandle))) { NativeReader fieldMapReader; if (!TryGetNativeReaderForBlob(mappingTableModule, ReflectionMapBlob.FieldAccessMap, out fieldMapReader)) { continue; } NativeParser fieldMapParser = new NativeParser(fieldMapReader, 0); NativeHashtable fieldHashtable = new NativeHashtable(fieldMapParser); ExternalReferencesTable externalReferences = default(ExternalReferencesTable); if (!externalReferences.InitializeCommonFixupsTable(mappingTableModule)) { continue; } var lookup = fieldHashtable.Lookup(canonWrapper.LookupHashCode); NativeParser entryParser; while (!(entryParser = lookup.GetNext()).IsNull) { // Grammar of a hash table entry: // Flags + DeclaringType + MdHandle or Name + Cookie or Ordinal or Offset FieldTableFlags entryFlags = (FieldTableFlags)entryParser.GetUnsigned(); FieldTableFlags storageClass = entryFlags & FieldTableFlags.StorageClass; Debug.Assert((entryFlags & FieldTableFlags.IsUniversalCanonicalEntry) == 0); if (storageClass == FieldTableFlags.Instance) { continue; } switch (fieldAccessKind) { case FieldAccessStaticDataKind.NonGC: if (storageClass != FieldTableFlags.NonGCStatic) { continue; } break; case FieldAccessStaticDataKind.GC: if (storageClass != FieldTableFlags.GCStatic) { continue; } break; case FieldAccessStaticDataKind.TLS: if (storageClass != FieldTableFlags.ThreadStatic) { continue; } break; default: return(false); } RuntimeTypeHandle entryDeclaringTypeHandle = externalReferences.GetRuntimeTypeHandleFromIndex(entryParser.GetUnsigned()); if (!entryDeclaringTypeHandle.Equals(declaringTypeHandle)) { continue; } if ((entryFlags & FieldTableFlags.HasMetadataHandle) != 0) { // skip metadata handle entryParser.GetUnsigned(); } else { // skip field name entryParser.SkipString(); } IntPtr fieldAddress = IntPtr.Zero; if ((entryFlags & FieldTableFlags.FieldOffsetEncodedDirectly) == 0) { fieldAddress = externalReferences.GetAddressFromIndex(entryParser.GetUnsigned()); } if (fieldAddress != IntPtr.Zero) { staticsRegionAddress = fieldAddress; break; } } // Static fields for a type can only be found in at most one module if (staticsRegionAddress != IntPtr.Zero) { break; } } return(staticsRegionAddress != IntPtr.Zero); }