/// <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);
}
