private ulong HandleConstant(EcmaModule module, ConstantHandle constantHandle)
{
MetadataReader reader = module.MetadataReader;
Constant constant = reader.GetConstant(constantHandle);
BlobReader blob = reader.GetBlobReader(constant.Value);
switch (constant.TypeCode)
{
case ConstantTypeCode.Byte:
return((ulong)blob.ReadByte());
case ConstantTypeCode.Int16:
return((ulong)blob.ReadInt16());
case ConstantTypeCode.Int32:
return((ulong)blob.ReadInt32());
case ConstantTypeCode.Int64:
return((ulong)blob.ReadInt64());
case ConstantTypeCode.SByte:
return((ulong)blob.ReadSByte());
case ConstantTypeCode.UInt16:
return((ulong)blob.ReadUInt16());
case ConstantTypeCode.UInt32:
return((ulong)blob.ReadUInt32());
case ConstantTypeCode.UInt64:
return((ulong)blob.ReadUInt64());
}
System.Diagnostics.Debug.Assert(false);
return(0);
}
void ParseEnum(TypeDefinition enumTypeDef)
{
// TODO: verify that int32 is the enums storage type for constant read below
InspectorEnum ienum = new InspectorEnum();
ienum.Name = metaReader.GetString(enumTypeDef.Name);
InspectorEnums [ienum.Name] = ienum;
var fields = enumTypeDef.GetFields();
foreach (var fieldHandle in fields)
{
var inspectorField = new InspectorField();
var fieldDef = metaReader.GetFieldDefinition(fieldHandle);
if ((fieldDef.Attributes & FieldAttributes.HasDefault) != 0)
{
var constantHandle = fieldDef.GetDefaultValue();
var constant = metaReader.GetConstant(constantHandle);
BlobReader constantReader = metaReader.GetBlobReader(constant.Value);
ienum.Values [metaReader.GetString(fieldDef.Name)] = constantReader.ReadInt32();
}
}
return;
}
private Mapping <ConstantHandle> MapConstantImpl(ConstantHandle handle)
{
Constant constant = _sourceMetadata.GetConstant(handle);
Mapping <Handle> parent = MapHandle(constant.Parent);
if (parent.Target.IsNil)
{
return(new Mapping <ConstantHandle>());
}
ConstantHandle targetHandle;
switch (parent.Target.Kind)
{
case HandleKind.Parameter:
Parameter targetParameter = _targetMetadata.GetParameter((ParameterHandle)parent.Target);
targetHandle = targetParameter.GetDefaultValue();
break;
case HandleKind.FieldDefinition:
FieldDefinition targetFieldDefinition = _targetMetadata.GetFieldDefinition((FieldDefinitionHandle)parent.Target);
targetHandle = targetFieldDefinition.GetDefaultValue();
break;
case HandleKind.PropertyDefinition:
PropertyDefinition targetPropertyDefinition = _targetMetadata.GetPropertyDefinition((PropertyDefinitionHandle)parent.Target);
targetHandle = targetPropertyDefinition.GetDefaultValue();
break;
default:
throw new InvalidOperationException();
}
if (targetHandle.IsNil)
{
return(new Mapping <ConstantHandle>());
}
Constant targetConstant = _targetMetadata.GetConstant(targetHandle);
if (constant.TypeCode != targetConstant.TypeCode)
{
var candidateTargets = ImmutableArray.Create(targetHandle);
var candidateReasons = ImmutableArray.Create("Mapped constant has a different type.");
return(new Mapping <ConstantHandle>(candidateTargets, candidateReasons));
}
ImmutableArray <byte> sourceContent = _sourceMetadata.GetBlobContent(constant.Value);
ImmutableArray <byte> targetContent = _targetMetadata.GetBlobContent(targetConstant.Value);
if (!sourceContent.SequenceEqual(targetContent))
{
var candidateTargets = ImmutableArray.Create(targetHandle);
var candidateReasons = ImmutableArray.Create("Mapped constant has a different value.");
return(new Mapping <ConstantHandle>(candidateTargets, candidateReasons));
}
return(new Mapping <ConstantHandle>(targetHandle));
}
public ConstantEntry(PEFile module, ConstantHandle handle)
{
this.metadataOffset = module.Reader.PEHeaders.MetadataStartOffset;
this.module = module;
this.metadata = module.Metadata;
this.handle = handle;
this.constant = metadata.GetConstant(handle);
}
//
// This returns the underlying enum values as "ulong" regardless of the actual underlying type. Signed integral types
// get sign-extended into the 64-bit value, unsigned types get zero-extended.
//
public static ulong ReadUnboxedEnumValue(MetadataReader metadataReader, ConstantHandle constantHandle)
{
if (constantHandle.IsNil)
{
throw new BadImageFormatException();
}
Constant constantValue = metadataReader.GetConstant(constantHandle);
if (constantValue.Value.IsNil)
{
throw new BadImageFormatException();
}
BlobReader reader = metadataReader.GetBlobReader(constantValue.Value);
switch (constantValue.TypeCode)
{
case ConstantTypeCode.Boolean:
return(reader.ReadBoolean() ? 1UL : 0UL);;
case ConstantTypeCode.Char:
return((ulong)(long)reader.ReadChar());
case ConstantTypeCode.SByte:
return((ulong)(long)reader.ReadSByte());
case ConstantTypeCode.Int16:
return((ulong)(long)reader.ReadInt16());
case ConstantTypeCode.Int32:
return((ulong)(long)reader.ReadInt32());
case ConstantTypeCode.Int64:
return((ulong)(long)reader.ReadInt64());
case ConstantTypeCode.Byte:
return((ulong)(long)reader.ReadByte());
case ConstantTypeCode.UInt16:
return((ulong)(long)reader.ReadUInt16());
case ConstantTypeCode.UInt32:
return((ulong)(long)reader.ReadUInt32());
case ConstantTypeCode.UInt64:
return((ulong)(long)reader.ReadUInt64());
}
throw new BadImageFormatException();
}
private void WriteConstant()
{
AddHeader(
"Parent",
"Type",
"Value"
);
for (int i = 1, count = reader.GetTableRowCount(TableIndex.Constant); i <= count; i++)
{
var entry = reader.GetConstant(MetadataTokens.ConstantHandle(i));
AddRow(
Token(entry.Parent),
EnumValue <byte>(entry.Type),
Literal(entry.Value)
);
}
WriteRows("Constant (0x0b):");
}
public static object ToRawObject(this ConstantHandle constantHandle, MetadataReader metadataReader)
{
if (constantHandle.IsNil)
{
throw new BadImageFormatException();
}
Constant constantValue = metadataReader.GetConstant(constantHandle);
if (constantValue.Value.IsNil)
{
throw new BadImageFormatException();
}
BlobReader reader = metadataReader.GetBlobReader(constantValue.Value);
switch (constantValue.TypeCode)
{
case ConstantTypeCode.Boolean:
return(reader.ReadBoolean());
case ConstantTypeCode.Char:
return(reader.ReadChar());
case ConstantTypeCode.SByte:
return(reader.ReadSByte());
case ConstantTypeCode.Int16:
return(reader.ReadInt16());
case ConstantTypeCode.Int32:
return(reader.ReadInt32());
case ConstantTypeCode.Int64:
return(reader.ReadInt64());
case ConstantTypeCode.Byte:
return(reader.ReadByte());
case ConstantTypeCode.UInt16:
return(reader.ReadUInt16());
case ConstantTypeCode.UInt32:
return(reader.ReadUInt32());
case ConstantTypeCode.UInt64:
return(reader.ReadUInt64());
case ConstantTypeCode.Single:
return(reader.ReadSingle());
case ConstantTypeCode.Double:
return(reader.ReadDouble());
case ConstantTypeCode.String:
return(reader.ReadUTF16(reader.Length));
case ConstantTypeCode.NullReference:
// Partition II section 22.9:
// The encoding of Type for the nullref value is ELEMENT_TYPE_CLASS with a Value of a 4-byte zero.
// Unlike uses of ELEMENT_TYPE_CLASS in signatures, this one is not followed by a type token.
if (reader.ReadUInt32() == 0)
{
return(null);
}
break;
}
throw new BadImageFormatException();
}
public static string ToString(this MetadataReader reader, ConstantHandle x) => reader.ToString(reader.GetConstant(x));
public static object?ToRawObject(this ConstantHandle constantHandle, MetadataReader metadataReader)
{
if (constantHandle.IsNil)
{
throw new BadImageFormatException();
}
Constant constantValue = metadataReader.GetConstant(constantHandle);
// Partition II section 24.2.4:
// The first entry in both these heaps is the empty 'blob' that consists of the single byte 0x00.
//
// This means zero value is valid for string and is used to represent the empty string.
if (constantValue.Value.IsNil && constantValue.TypeCode != ConstantTypeCode.String)
{
throw new BadImageFormatException();
}
BlobReader reader = metadataReader.GetBlobReader(constantValue.Value);
switch (constantValue.TypeCode)
{
case ConstantTypeCode.Boolean:
return(reader.ReadBoolean());
case ConstantTypeCode.Char:
return(reader.ReadChar());
case ConstantTypeCode.SByte:
return(reader.ReadSByte());
case ConstantTypeCode.Int16:
return(reader.ReadInt16());
case ConstantTypeCode.Int32:
return(reader.ReadInt32());
case ConstantTypeCode.Int64:
return(reader.ReadInt64());
case ConstantTypeCode.Byte:
return(reader.ReadByte());
case ConstantTypeCode.UInt16:
return(reader.ReadUInt16());
case ConstantTypeCode.UInt32:
return(reader.ReadUInt32());
case ConstantTypeCode.UInt64:
return(reader.ReadUInt64());
case ConstantTypeCode.Single:
return(reader.ReadSingle());
case ConstantTypeCode.Double:
return(reader.ReadDouble());
case ConstantTypeCode.String:
return(reader.ReadUTF16(reader.Length));
case ConstantTypeCode.NullReference:
// Partition II section 22.9:
// The encoding of Type for the nullref value is ELEMENT_TYPE_CLASS with a Value of a 4-byte zero.
// Unlike uses of ELEMENT_TYPE_CLASS in signatures, this one is not followed by a type token.
if (reader.ReadUInt32() == 0)
{
return(null);
}
break;
}
throw new BadImageFormatException();
}
public static Constant GetConstant(this ConstantHandle handle, MetadataReader reader) => reader.GetConstant(handle);
