private void ProcessType(ModuleDesc assembly)
{
if (ShouldProcessElement())
{
string typeName = _reader.GetAttribute("fullname");
if (typeName.Contains('*'))
{
throw new NotSupportedException();
}
TypeDesc type = CustomAttributeTypeNameParser.GetTypeByCustomAttributeTypeName(assembly, typeName, throwIfNotFound: false);
if (type == null)
{
//Context.LogWarning ($"Could not resolve type '{fullname}'", 2008, _xmlDocumentLocation);
_reader.Skip();
return;
}
_reader.Read();
while (_reader.IsStartElement())
{
if (_reader.Name == "method")
{
ProcessMethod(type);
}
else if (_reader.Name == "field")
{
ProcessField(type);
}
else if (_reader.Name == "attribute")
{
ProcessAttribute(type);
}
_reader.Skip();
}
}
_reader.Skip();
}
/// <summary>
/// Extract preinitialize data as byte[] from a RVA field, and perform necessary validations.
/// </summary>
private static PreInitFieldInfo ConstructPreInitFieldInfo(FieldDesc field, FieldDesc dataField)
{
if (!dataField.HasRva)
{
throw new BadImageFormatException();
}
var ecmaDataField = dataField as EcmaField;
if (ecmaDataField == null)
{
throw new NotSupportedException();
}
var rvaData = ecmaDataField.GetFieldRvaData();
var fieldType = field.FieldType;
int elementCount;
int realDataOffset;
TypeDesc realDataType = null;
//
// Construct fixups
//
List <PreInitFixupInfo> fixups = null;
var typeFixupAttrs = ecmaDataField.GetDecodedCustomAttributes("System.Runtime.CompilerServices", "TypeHandleFixupAttribute");
foreach (var typeFixupAttr in typeFixupAttrs)
{
if (typeFixupAttr.FixedArguments[0].Type != field.Context.GetWellKnownType(WellKnownType.Int32))
{
throw new BadImageFormatException();
}
int offset = (int)typeFixupAttr.FixedArguments[0].Value;
var typeArg = typeFixupAttr.FixedArguments[1].Value;
var fixupType = typeArg as TypeDesc;
if (fixupType == null)
{
if (typeArg is string fixupTypeName)
{
fixupType = CustomAttributeTypeNameParser.GetTypeByCustomAttributeTypeName(ecmaDataField.Module, fixupTypeName, throwIfNotFound: true);
}
else
{
throw new BadImageFormatException();
}
}
fixups = fixups ?? new List <PreInitFixupInfo>();
if (offset == 0 && fieldType.IsSzArray)
{
// For array field, offset 0 is the element type handle followed by the element count
realDataType = fixupType;
}
else
{
fixups.Add(new PreInitTypeFixupInfo(offset, fixupType));
}
}
var methodFixupAttrs = ecmaDataField.GetDecodedCustomAttributes("System.Runtime.CompilerServices", "MethodAddrFixupAttribute");
foreach (var methodFixupAttr in methodFixupAttrs)
{
if (methodFixupAttr.FixedArguments[0].Type != field.Context.GetWellKnownType(WellKnownType.Int32))
{
throw new BadImageFormatException();
}
int offset = (int)methodFixupAttr.FixedArguments[0].Value;
TypeDesc fixupType = methodFixupAttr.FixedArguments[1].Value as TypeDesc;
if (fixupType == null)
{
throw new BadImageFormatException();
}
string methodName = methodFixupAttr.FixedArguments[2].Value as string;
if (methodName == null)
{
throw new BadImageFormatException();
}
var method = fixupType.GetMethod(methodName, signature: null);
if (method == null)
{
throw new BadImageFormatException();
}
fixups = fixups ?? new List <PreInitFixupInfo>();
fixups.Add(new PreInitMethodFixupInfo(offset, method));
}
var fieldFixupAttrs = ecmaDataField.GetDecodedCustomAttributes("System.Runtime.CompilerServices", "FieldAddrFixupAttribute");
foreach (var fieldFixupAttr in fieldFixupAttrs)
{
if (fieldFixupAttr.FixedArguments[0].Type != field.Context.GetWellKnownType(WellKnownType.Int32))
{
throw new BadImageFormatException();
}
int offset = (int)fieldFixupAttr.FixedArguments[0].Value;
TypeDesc fixupType = fieldFixupAttr.FixedArguments[1].Value as TypeDesc;
if (fixupType == null)
{
throw new BadImageFormatException();
}
string fieldName = fieldFixupAttr.FixedArguments[2].Value as string;
if (fieldName == null)
{
throw new BadImageFormatException();
}
var fixupField = fixupType.GetField(fieldName);
if (fixupField == null)
{
throw new BadImageFormatException();
}
if (!fixupField.IsStatic)
{
throw new BadImageFormatException();
}
fixups = fixups ?? new List <PreInitFixupInfo>();
fixups.Add(new PreInitFieldFixupInfo(offset, fixupField));
}
if (fieldType.IsValueType || fieldType.IsPointer)
{
elementCount = -1;
realDataOffset = 0;
realDataType = fieldType;
}
else if (fieldType.IsSzArray)
{
// Offset 0 is the element type handle fixup followed by the element count
if (realDataType == null)
{
throw new BadImageFormatException();
}
int ptrSize = fieldType.Context.Target.PointerSize;
elementCount = rvaData[ptrSize] | rvaData[ptrSize + 1] << 8 | rvaData[ptrSize + 2] << 16 | rvaData[ptrSize + 3] << 24;
realDataOffset = ptrSize * 2;
realDataType = realDataType.MakeArrayType();
}
else
{
throw new NotSupportedException();
}
return(new PreInitFieldInfo(field, realDataType, rvaData, realDataOffset, elementCount, fixups));
}
