private static Object ExtractArrayValue(Signature.Type type,
BinaryReader reader,
MetaDataResolver resolver,
MetaDataResolver[] resolvers)
{
int arraySize = reader.ReadInt32();
if (arraySize >= 0)
{
ElementTypes elementType = type.ElementType;
if (elementType == ElementTypes.CLASS)
{
Object[] array = new Object[arraySize];
for (int i = 0; i < arraySize; i++)
{
array[i] = ExtractParameter(type, reader,
resolver, resolvers);
}
return(array);
}
else
{
return(ExtractArrayValue(elementType, arraySize, reader));
}
}
else
{
throw new Exception("Not implemented: custom attribute class " +
"array with negative length");
}
}
internal void resolveReferences(MetaDataLoader loader,
PELoader peLoader,
Stream fileStream)
{
this.field.resolveReferences(this);
int dataOffset = peLoader.VaToOffsetSafe(this.rva);
if (dataOffset != -1)
{
fileStream.Seek(dataOffset, SeekOrigin.Begin);
BinaryReader reader = new BinaryReader(fileStream);
SignatureField fieldSignature = (SignatureField)
this.field.Signature;
Signature.Type fieldType = fieldSignature.FieldType;
int dataSize = this.getFieldSize(fieldType);
byte[] data = new byte[dataSize];
int count = reader.Read(data, 0, dataSize);
if (loader.HasVtableFixup() &&
loader.RVAHasRelocation(dataOffset) &&
dataSize == 4)
{
// if this corresponds to a vtable label, we need to fix it
int location = data[0] | (data[1] << 8) |
(data[2] << 16) | (data[3] << 24);
int imageBase = peLoader.getImageBase();
location -= imageBase; // use RVA
fileStream.Seek(location, SeekOrigin.Begin);
BinaryReader binaryReader = new BinaryReader(fileStream);
short prefix = binaryReader.ReadInt16();
if (prefix == 0x25FF) // this starts a vtable lable
{
count = binaryReader.Read(data, 0, 4);
}
}
this.dataBytes = data;
if (count != dataSize)
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Only got " + count + " out of " + dataSize + " data bytes for FieldRVA " + this.rva);
}
}
else
{
Console.WriteLine("Found no data for " + this.field);
}
}
// Helper Methods
private int getFieldSize(Signature.Type fieldType)
{
switch (fieldType.ElementType)
{
case ElementTypes.VOID:
return(0);
case ElementTypes.BOOLEAN:
case ElementTypes.I1:
case ElementTypes.U1:
return(1);
case ElementTypes.CHAR:
case ElementTypes.I2:
case ElementTypes.U2:
return(2);
case ElementTypes.I4:
case ElementTypes.U4:
case ElementTypes.R4:
return(4);
case ElementTypes.I8:
case ElementTypes.U8:
case ElementTypes.R8:
return(8);
case ElementTypes.OBJECT:
case ElementTypes.STRING:
case ElementTypes.FNPTR:
case ElementTypes.CLASS:
case ElementTypes.PTR:
case ElementTypes.BYREF:
case ElementTypes.U:
case ElementTypes.I:
return(machineIntSize);
case ElementTypes.TYPEDBYREF:
return(2 * machineIntSize);
case ElementTypes.VALUETYPE: {
MetaDataObject classObject = fieldType.ClassObject;
if (!(classObject is MetaDataTypeDefinition))
{
return(-1);
}
MetaDataTypeDefinition typedef = (MetaDataTypeDefinition)classObject;
if ((typedef.Flags & TypeAttributes.Interface) != 0 ||
(typedef.Flags & TypeAttributes.Abstract) != 0)
{
return(-1);
}
int classSize = 0;
int packSize = 0;
if (typedef.ClassLayout != null)
{
classSize = typedef.ClassLayout.ClassSize;
packSize = typedef.ClassLayout.PackingSize;
}
int instanceFieldSize = 0;
if ((typedef.Flags & TypeAttributes.ExplicitLayout) != 0)
{
foreach (MetaDataField mdField in typedef.Fields)
{
if ((mdField.Flags & (int)MetaDataField.FieldAttributes.Static) == 0)
{
Signature.Type nestedFieldType =
((SignatureField)mdField.Signature).FieldType;
int fieldSize = this.getFieldSize(nestedFieldType);
int offset = mdField.Layout.Offset;
int fieldEnd = fieldSize + offset;
if (fieldEnd > instanceFieldSize)
{
instanceFieldSize = fieldEnd;
}
}
}
}
else
{
foreach (MetaDataField mdField in typedef.Fields)
{
if ((mdField.Flags & (int)MetaDataField.FieldAttributes.Static) == 0)
{
Signature.Type nestedFieldType =
((SignatureField)mdField.Signature).FieldType;
int fieldSize = this.getFieldSize(nestedFieldType);
if (fieldSize == -1)
{
return(-1);
}
if (packSize > 1)
{
int delta = instanceFieldSize % packSize;
if (delta > 0)
{
instanceFieldSize += packSize - delta;
}
}
instanceFieldSize += fieldSize;
}
}
}
if (instanceFieldSize > classSize)
{
return(instanceFieldSize);
}
else if (classSize > 0)
{
return(classSize);
}
else
{
return(1);
}
}
case ElementTypes.ARRAY: {
int elementCount = 1;
uint[] lowerBounds = fieldType.LowerBounds;
uint[] upperBounds = fieldType.UpperBounds;
int rank = upperBounds.Length;
for (int i = 0; i < rank; i++)
{
int dimSize = (int)(upperBounds[i] - lowerBounds[i]);
if (dimSize == 0)
{
// Must be an array of pointers to other arrays
return(elementCount * machineIntSize);
}
else
{
elementCount *= dimSize;
}
}
int elementSize = this.getFieldSize(fieldType.TypeObject);
return(elementCount * elementSize);
}
case ElementTypes.CMOD_REQD:
case ElementTypes.CMOD_OPT:
return(this.getFieldSize(fieldType.TypeObject));
case ElementTypes.PINNED:
return(this.getFieldSize(fieldType.TypeObject));
case ElementTypes.SZARRAY:
// Should be machine dependent!
return(4);
case ElementTypes.SENTINEL:
case ElementTypes.END:
default:
return(-1);
}
}
// Resolve all the custom attributes found in the assemblies registered
// in 'resolver', using all the type information found in 'resolver' and
// 'resolvers'.
internal void resolveReferences(MetaDataResolver resolver,
MetaDataResolver[] resolvers)
{
if (this.buffer[0] != 0x01 || this.buffer[1] != 0x00)
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Custom Attribute doesn't start with 0x0001!");
}
SignatureMethod signature;
if (this.type is MetaDataMethod)
{
MetaDataMethod method = (MetaDataMethod)this.type;
signature = (SignatureMethod)method.Signature;
if (!method.Name.Equals(".ctor"))
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Custom attribute with unexpected method name: " + method.Name);
}
this.typeDefOrRef = method.Parent;
this.name = method.Parent.FullName;
}
else if (this.type is MetaDataMemberRef)
{
MetaDataMemberRef memberRef = (MetaDataMemberRef)this.type;
signature = (SignatureMethod)memberRef.Signature;
if (!memberRef.Name.Equals(".ctor"))
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Custom attribute with unexpected memberRef name: " + memberRef.Name);
}
MetaDataObject methodParent = memberRef.Class;
this.typeDefOrRef = methodParent;
if (methodParent is MetaDataTypeDefinition)
{
this.name = ((MetaDataTypeDefinition)methodParent).FullName;
}
else if (methodParent is MetaDataTypeReference)
{
this.name = ((MetaDataTypeReference)methodParent).FullName;
}
else
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Custom attribute with unexpected class type: " + methodParent);
}
}
else
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Custom attribute with unexpected type: " + this.type);
}
Signature.Param[] parameters = signature.Parameters;
int fixedCount = parameters.Length;
this.fixedArgs = new Object[fixedCount];
MemoryStream stream =
new MemoryStream(this.buffer, 2, this.buffer.Length - 2, false);
BinaryReader reader = new BinaryReader(stream);
for (int i = 0; i < fixedCount; i++)
{
Signature.Param parameter = parameters[i];
Signature.Type paramType = parameter.Type;
Object value =
ExtractParameter(paramType, reader, resolver, resolvers);
fixedArgs[i] = value;
}
short namedCount = ((reader.PeekChar() == -1) ?
(short)0 :
reader.ReadInt16());
if (namedCount > this.buffer.Length &&
this.Name.Equals("System.Runtime.CompilerServices.RequiredAttributeAttribute"))
{
// Some CLR libraries have been compiled against a version of
// mscorlib that had a fixed parameter to RequiredAttribute.
// Simply ignore whatever the parameter was!
namedCount = 0;
}
this.namedArgs = new NamedArg[namedCount];
for (int i = 0; i < namedCount; i++)
{
SerializationTypes propOrField = (SerializationTypes)
reader.ReadByte();
ElementTypes fieldType = (ElementTypes)reader.ReadByte();
ElementTypes arrayType = ElementTypes.END;
switch (fieldType)
{
case ElementTypes.SZARRAY: {
arrayType = (ElementTypes)reader.ReadByte();
if (arrayType == (ElementTypes)SerializationTypes.ENUM)
{
throw new Exception("Not implemented: Array of ENUM " +
"for named field/property");
}
break;
}
case (ElementTypes)SerializationTypes.ENUM: {
String enumName = ExtractString(reader);
if (enumName.Length == 0)
{
throw new Exception("Empty enum name");
}
// Hope it is a 4-byte enum
fieldType = (ElementTypes)SerializationTypes.U4;
break;
}
case (ElementTypes)SerializationTypes.TAGGED_OBJECT: {
throw new Exception("Not implemented: " + fieldType +
" for named field/property");
}
default: {
break;
}
}
String name = ExtractString(reader);
Object value;
if (fieldType == ElementTypes.SZARRAY)
{
value = ExtractArrayValue(arrayType, reader);
}
else
{
value = ExtractValue(fieldType, reader);
}
if (propOrField == SerializationTypes.FIELD ||
propOrField == SerializationTypes.PROPERTY)
{
this.namedArgs[i] =
new NamedArg(propOrField == SerializationTypes.FIELD,
-1, name, value);
}
else
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Unknown prop-or-field type: " + propOrField);
}
}
}
private static Object ExtractParameter(Signature.Type type,
BinaryReader reader,
MetaDataResolver resolver,
MetaDataResolver[] resolvers)
{
switch (type.ElementType)
{
case ElementTypes.VALUETYPE: {
MetaDataObject classObject = type.ClassObject;
if (classObject is MetaDataTypeReference)
{
MetaDataTypeReference classReference =
(MetaDataTypeReference)classObject;
MetaDataObject resolvedObject =
ResolveTypeRef(resolver, resolvers, classReference);
if (resolvedObject is MetaDataTypeDefinition)
{
classObject = resolvedObject;
}
}
if (classObject is MetaDataTypeReference)
{
// We will simply assume it is an I4 enum
Console.Out.WriteLine("====>>> WARNING: Making I4 enum assumption for " + classObject);
return(reader.ReadInt32());
}
else if (classObject is MetaDataTypeDefinition)
{
MetaDataTypeDefinition classDef =
(MetaDataTypeDefinition)classObject;
MetaDataObject superClass = classDef.Extends;
String superName;
if (superClass is MetaDataTypeDefinition)
{
superName =
((MetaDataTypeDefinition)superClass).FullName;
}
else if (superClass is MetaDataTypeReference)
{
superName =
((MetaDataTypeReference)superClass).FullName;
}
else
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Unexpected superclass of valuetype: " + superClass);
}
if (!superName.Equals("System.Enum"))
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Found valuetype that wasn't an Enum");
}
return(ExtractEnumValue(classDef, reader,
resolver, resolvers));
}
else
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Unexpected valuetype class: " + classObject);
}
}
case ElementTypes.CLASS: {
MetaDataObject classObject = type.ClassObject;
if (classObject is MetaDataTypeReference)
{
MetaDataTypeReference classReference =
(MetaDataTypeReference)classObject;
MetaDataObject resolvedObject =
ResolveTypeRef(resolver, resolvers, classReference);
if (resolvedObject is MetaDataTypeDefinition)
{
classObject = resolvedObject;
}
}
String className;
if (classObject is MetaDataTypeReference)
{
className =
((MetaDataTypeReference)classObject).FullName;
}
else if (classObject is MetaDataTypeDefinition)
{
className =
((MetaDataTypeDefinition)classObject).FullName;
}
else
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Unexpected class: " + classObject);
}
if (className.Equals("System.String"))
{
return(ExtractString(reader));
}
else if (className.Equals("System.Object"))
{
goto case ElementTypes.OBJECT;
}
else if (className.Equals("System.Type"))
{
return(ExtractString(reader));
}
if (!(classObject is MetaDataTypeDefinition))
{
throw new MetaDataLoader.IllegalMetaDataFormatException("Cannot determine whether the following is an array: " + classObject);
}
MetaDataObject superClass =
((MetaDataTypeDefinition)classObject).Extends;
Console.WriteLine("class is " + classObject);
throw new Exception("Not implemented: object encoding an array");
}
case ElementTypes.OBJECT:
case (ElementTypes)SerializationTypes.TAGGED_OBJECT: {
SerializationTypes objectType = (SerializationTypes)
reader.ReadByte();
switch (objectType)
{
case SerializationTypes.ENUM: {
String typeName = ExtractString(reader);
// Some Stringified type names include a bunch of
// information past the type, none of which we
// are concerned about for the moment.
int nameEnd = typeName.IndexOf(',');
if (nameEnd >= 0)
{
typeName = typeName.Substring(0, nameEnd);
}
// A type defined within another type has a "+"
// as the separator. Convert it to ".", which is
// the convention the rest of the reader uses.
typeName = typeName.Replace('+', '.');
MetaDataTypeDefinition typeDef =
ResolveName(resolver, resolvers, typeName);
if (typeDef == null)
{
throw new Exception("No typedef for " + typeName);
}
return(ExtractEnumValue(typeDef, reader,
resolver, resolvers));
}
case SerializationTypes.TYPE: {
return(ExtractValue((ElementTypes)objectType,
reader));
}
default: {
throw new Exception("Found OBJECT type with type " + objectType);
}
}
}
case ElementTypes.SZARRAY: {
return(ExtractArrayValue(type.TypeObject, reader,
resolver, resolvers));
}
default: {
return(ExtractValue(type.ElementType, reader));
}
}
}
Type GetType(Bartok.MSIL.Signature.Type type, string path)
{
if (type == null)
{
return(global.Types.TypedReference);
}
switch (type.ElementType)
{
case ElementTypes.VOID: return(global.Types.Void);
case ElementTypes.BOOLEAN: return(global.Types.Bool);
case ElementTypes.CHAR: return(global.Types.Char);
case ElementTypes.I1: return(global.Types.SByte);
case ElementTypes.U1: return(global.Types.Byte);
case ElementTypes.I2: return(global.Types.Short);
case ElementTypes.U2: return(global.Types.UShort);
case ElementTypes.I:
case ElementTypes.I4: return(global.Types.Int);
case ElementTypes.U:
case ElementTypes.U4: return(global.Types.UInt);
case ElementTypes.I8: return(global.Types.Long);
case ElementTypes.U8: return(global.Types.ULong);
case ElementTypes.R4: return(global.Types.Float);
case ElementTypes.R8: return(global.Types.Double);
case ElementTypes.OBJECT: return(global.Types.Object);
case ElementTypes.STRING: return(global.Types.String);
case ElementTypes.TYPEDBYREF: return(global.Types.TypedReference);
case ElementTypes.VALUETYPE:
case ElementTypes.CLASS:
Type t = ResolveTypeRef(type.ClassObject, path);
if (t == null)
{
Debug.Fail("unknown CLASSTYPE " + type.ClassObject.ToStringLong());
}
return(t);
case ElementTypes.SZARRAY:
return(new ArrayType(GetType(type.TypeObject, path), global.Types.Array));
case ElementTypes.ARRAY:
return(new ArrayType(GetType(type.TypeObject, path), type.Rank, global.Types.Array));
case ElementTypes.FNPTR:
case ElementTypes.CMOD_OPT:
case ElementTypes.CMOD_REQD: return(GetType(type.TypeObject, path));
case ElementTypes.PINNED:
case ElementTypes.PTR:
return(new UnmanagedPointerType(GetType(type.TypeObject, path)));
case ElementTypes.BYREF:
return(new ManagedPointerType(GetType(type.TypeObject, path)));
default:
Debug.Fail("unknown element type " + type); break;
}
return(global.Types.Object);
}
