public AsyncStateMachineMetadata(
Type stateMachineType,
AsyncStateMachineField owner,
AsyncStateMachineField state,
AsyncStateMachineField builder,
AsyncStateMachineField[] inputArgs,
AsyncStateMachineField[] localVars)
{
StateMachineType = stateMachineType;
Owner = owner;
State = state;
Builder = builder;
InputArguments = inputArgs;
LocalVariables = localVars;
}
public AsyncStateMachineMetadata Build(Type stateMachineType)
{
if (stateMachineType == null)
{
throw new ArgumentNullException(nameof(stateMachineType));
}
var fields = stateMachineType.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
var inputArguments = new List <AsyncStateMachineField>();
var localVariables = new List <AsyncStateMachineField>();
AsyncStateMachineField?owner = null;
AsyncStateMachineField?state = null;
AsyncStateMachineField?builder = null;
Type builderType = null;
var isCompilerGeneratedAsm = stateMachineType
#if NETSTANDARD
.GetTypeInfo()
#endif
.GetCustomAttribute <CompilerGeneratedAttribute>() != null;
foreach (var fi in fields)
{
bool isCompilerGeneratedField = false;
string name = fi.Name;
string internalName = name;
if (name[0] == '<')
{
isCompilerGeneratedField = true;
var closingBracketIndex = fi.Name.IndexOf('>');
name = fi.Name.Substring(1, closingBracketIndex - 1);
internalName = fi.Name.Substring(closingBracketIndex + 1);
}
if ((isCompilerGeneratedField && name.Length == 0 && fi.Name.EndsWith("__this")) ||
(!isCompilerGeneratedField && fi.Name == "__this"))
{
if (isCompilerGeneratedField)
{
name = "__this";
}
owner = new AsyncStateMachineField(AsyncStateMachineFieldType.OwnerReference, fi, name, internalName);
}
else if (fi.FieldType == typeof(int) && (
(isCompilerGeneratedField && name.Length == 0 && fi.Name.EndsWith("__state")) ||
(!isCompilerGeneratedField && fi.Name == "__state")))
{
if (isCompilerGeneratedField)
{
name = "__state";
}
state = new AsyncStateMachineField(AsyncStateMachineFieldType.State, fi, name, internalName);
}
else if (/*name.Length == 0 && fi.Name.EndsWith("__builder") &&*/
(fi.FieldType == typeof(AsyncTaskMethodBuilder) ||
(fi.FieldType.GetTypeInfo().IsGenericType&& fi.FieldType.GetGenericTypeDefinition() == typeof(AsyncTaskMethodBuilder <>))))
{
if (isCompilerGeneratedField)
{
name = "__builder";
}
builder = new AsyncStateMachineField(AsyncStateMachineFieldType.Builder, fi, name, internalName);
builderType = fi.FieldType;
}
else if (isCompilerGeneratedField || !isCompilerGeneratedAsm)
{
#warning Need to solve problem when variables have the same name? e.g. "<myVar>5__1" and "<myVar>5__2". They must be in different scopes.
localVariables.Add(new AsyncStateMachineField(
AsyncStateMachineFieldType.LocalVariable,
fi, name, internalName));
}
else
{
inputArguments.Add(new AsyncStateMachineField(
AsyncStateMachineFieldType.InputArgument,
fi, name, internalName));
}
}
return(new AsyncStateMachineMetadata(
stateMachineType,
owner ?? default(AsyncStateMachineField),
state ?? default(AsyncStateMachineField),
builder ?? default(AsyncStateMachineField),
inputArgs: inputArguments.ToArray(),
localVars: localVariables.ToArray()));
}
