/// <summary>
/// Creates a CIL method body from a dynamic method.
/// </summary>
/// <param name="method">The method that owns the method body.</param>
/// <param name="dynamicMethodObj">The Dynamic Method/Delegate/DynamicResolver.</param>
/// <param name="operandResolver">
/// The object instance to use for resolving operands of an instruction in the
/// method body.
/// </param>
/// <param name="importer">
/// The object instance to use for importing operands of an instruction in the
/// method body.
/// </param>
/// <returns>The method body.</returns>
public static CilMethodBody FromDynamicMethod(
MethodDefinition method,
object dynamicMethodObj,
ICilOperandResolver operandResolver = null,
ReferenceImporter importer = null)
{
if (!(method.Module is SerializedModuleDefinition module))
{
throw new ArgumentException("Method body should reference a serialized module.");
}
var result = new CilMethodBody(method);
operandResolver ??= new CilOperandResolver(method.Module, result);
importer ??= new ReferenceImporter(method.Module);
dynamicMethodObj = DynamicMethodHelper.ResolveDynamicResolver(dynamicMethodObj);
//Get Runtime Fields
var code = FieldReader.ReadField <byte[]>(dynamicMethodObj, "m_code");
var scope = FieldReader.ReadField <object>(dynamicMethodObj, "m_scope");
var tokenList = FieldReader.ReadField <List <object> >(scope, "m_tokens");
var localSig = FieldReader.ReadField <byte[]>(dynamicMethodObj, "m_localSignature");
var ehHeader = FieldReader.ReadField <byte[]>(dynamicMethodObj, "m_exceptionHeader");
var ehInfos = FieldReader.ReadField <IList <object> >(dynamicMethodObj, "m_exceptions");
// Read raw instructions.
var reader = new ByteArrayReader(code);
var disassembler = new CilDisassembler(reader);
result.Instructions.AddRange(disassembler.ReadAllInstructions());
//Local Variables
DynamicMethodHelper.ReadLocalVariables(result, method, localSig);
//Exception Handlers
DynamicMethodHelper.ReadReflectionExceptionHandlers(result, ehInfos, ehHeader, importer);
// Resolve all operands.
foreach (var instruction in result.Instructions)
{
instruction.Operand =
DynamicMethodHelper.ResolveOperandReflection(module.ReaderContext, result, instruction, operandResolver, tokenList, importer) ??
instruction.Operand;
}
return(result);
}
/// <inheritdoc />
public override object ResolveMember(MetadataToken token)
{
switch (token.Table)
{
case TableIndex.TypeDef:
var type = _tokens[(int)token.Rid];
if (type is RuntimeTypeHandle runtimeTypeHandle)
{
return(_importer.ImportType(Type.GetTypeFromHandle(runtimeTypeHandle)));
}
break;
case TableIndex.Field:
var field = _tokens[(int)token.Rid];
if (field is null)
{
return(null);
}
if (field is RuntimeFieldHandle runtimeFieldHandle)
{
return(_importer.ImportField(FieldInfo.GetFieldFromHandle(runtimeFieldHandle)));
}
if (field.GetType().FullName == "System.Reflection.Emit.GenericFieldInfo")
{
bool result = FieldReader.TryReadField <RuntimeFieldHandle>(field, "m_field", out var mField);
var ctx = FieldReader.ReadField <RuntimeTypeHandle>(field, "m_context");
return(_importer.ImportField(FieldInfo.GetFieldFromHandle(result
? mField
: FieldReader.ReadField <RuntimeFieldHandle>(field, "m_fieldHandle"), ctx)));
}
break;
case TableIndex.Method:
case TableIndex.MemberRef:
var obj = _tokens[(int)token.Rid];
if (obj is RuntimeMethodHandle methodHandle)
{
return(_importer.ImportMethod(MethodBase.GetMethodFromHandle(methodHandle)));
}
if (obj.GetType().FullName == "System.Reflection.Emit.GenericMethodInfo")
{
var context = FieldReader.ReadField <RuntimeTypeHandle>(obj, "m_context");
bool hasHandle = FieldReader.TryReadField <RuntimeMethodHandle>(obj, "m_method", out var mMethod);
var mHandle = FieldReader.ReadField <RuntimeMethodHandle>(obj, "m_methodHandle");
var method = MethodBase.GetMethodFromHandle(
hasHandle ? mMethod : mHandle,
context);
return(_importer.ImportMethod(method));
}
if (obj.GetType().FullName == "System.Reflection.Emit.VarArgMethod")
{
return(_importer.ImportMethod(FieldReader.ReadField <MethodInfo>(obj, "m_method")));
}
break;
case TableIndex.StandAloneSig:
var reader = ByteArrayDataSource.CreateReader((byte[])_tokens[(int)token.Rid]);
return(CallingConventionSignature.FromReader(new BlobReadContext(_readerContext), ref reader));
}
return(token);
}
