/// <summary>
/// Constructs an instance
/// </summary>
/// <param name="ctx">underlying design context</param>
/// <param name="code">code descriptor of async method to decompile</param>
/// <param name="instance">assumed instance on which the method is called</param>
/// <param name="arguments">sample instances of method arguments</param>
public AsyncMethodDecompiler(DesignContext ctx, CodeDescriptor code, object instance, object[] arguments)
{
_context = ctx;
_code = code;
_instance = instance;
_arguments = arguments;
ImplStyle = code.AsyncMethod.HasCustomOrInjectedAttribute<TransformIntoFSM>() ? EAsyncImplStyle.FSM : EAsyncImplStyle.Sequential;
}
private CoFSM DecompileToCoFSM(string prefix)
{
ImplStyle = EAsyncImplStyle.FSM;
InjectAttributes(prefix);
InitializeCFGs();
CoFSM cofsm = new CoFSM();
var args = _code.AsyncMethod.GetParameters();
cofsm.Arguments = new Variable[args.Length];
_argFields = new Dictionary<string, Variable>();
for (int i = 0; i < args.Length; i++)
{
string name = prefix + "_" + args[i].Name;
var argv = new Variable(TypeDescriptor.GetTypeOf(_arguments[i]))
{
Name = name
};
_argFields[args[i].Name] = argv;
cofsm.Arguments[i] = argv;
}
int numILStates = _stateCFGs.Length;
var mym = _code as MethodDescriptor;
cofsm.Method = mym;
cofsm.Dependencies = new HashSet<Task>();
// Create result variable and done flag
cofsm.DoneVar = new Variable(typeof(bool)) {
Name = prefix + "_$done"
};
if (_code.AsyncMethod.ReturnType.IsGenericType &&
_code.AsyncMethod.ReturnType.GetGenericTypeDefinition().Equals(typeof(Task<>)))
{
var resultType = _code.AsyncMethod.ReturnType.GetGenericArguments()[0];
if (!resultType.Equals(typeof(void)))
{
cofsm.ResultVar = new Variable(resultType)
{
Name = prefix + "_$result"
};
var builderType = typeof(AsyncTaskMethodBuilder<>).MakeGenericType(resultType);
AttributeInjector.Inject(builderType,
new MapToIntrinsicType(Meta.EIntrinsicTypes.IllegalRuntimeType));
var aoc1 = builderType.GetMethod("AwaitOnCompleted");
var aoc2 = builderType.GetMethod("AwaitUnsafeOnCompleted");
var rwc = new AwaitOnCompletedRewriter();
AttributeInjector.Inject(aoc1, rwc);
AttributeInjector.Inject(aoc2, rwc);
var sr = builderType.GetMethod("SetResult");
var rwsr = new SetResultRewriter();
AttributeInjector.Inject(sr, rwsr);
var se = builderType.GetMethod("SetException");
var serw = new SetExceptionRewriter();
AttributeInjector.Inject(se, serw);
AttributeInjector.Inject(builderType, new HideDeclaration());
var awaiterType = typeof(TaskAwaiter<>).MakeGenericType(resultType);
AttributeInjector.Inject(awaiterType,
new MapToIntrinsicType(Meta.EIntrinsicTypes.IllegalRuntimeType));
AttributeInjector.Inject(awaiterType.GetMethod("get_IsCompleted"), new RewriteIsCompleted());
AttributeInjector.Inject(awaiterType.GetMethod("OnCompleted"), new AwaitOnCompletedRewriter());
AttributeInjector.Inject(awaiterType.GetMethod("UnsafeOnCompleted"), new AwaitOnCompletedRewriter());
AttributeInjector.Inject(awaiterType.GetMethod("GetResult"), new RewriteGetResult());
AttributeInjector.Inject(awaiterType, new HideDeclaration());
}
}
// Decompile state handlers
_stateInfos = new Dictionary<StateInfo, StateInfo>();
var decomp = new MSILDecompiler(_code, _stateCFGs[0], _fsmInstance);
_curTempl = decomp.Template;
_curTempl.AddAttribute(this);
_curTempl.DisallowReturnStatements = true;
_curTempl.DisallowConditionals = true;
_curTempl.DisallowLoops = true;
var lvState = _curTempl.ExportLocalVariableState();
var startSI = new StateInfo(-1);
foreach (var kvp in _locFields)
startSI.LVState[kvp.Key] = kvp.Value.Type.GetSampleInstance(ETypeCreationOptions.ForceCreation);
_stateInfos[startSI] = startSI;
_curSI = startSI;
var stateList = new List<StateInfo>();
stateList.Add(startSI);
_stateQ = new Queue<StateInfo>();
_curCoFSM = cofsm;
startSI.Result = decomp.Decompile();
while (_stateQ.Any())
{
var nextSI = _stateQ.Dequeue();
_curSI = nextSI.Fork(nextSI.ILState);
decomp = new MSILDecompiler(_code, _stateCFGs[nextSI.ILState + 1], _fsmInstance);
_curTempl = decomp.Template;
_curTempl.AddAttribute(this);
_curTempl.DisallowReturnStatements = true;
_curTempl.DisallowConditionals = true;
_curTempl.DisallowLoops = true;
_curSI.Result = decomp.Decompile();
stateList.Add(_curSI);
_stateInfos[_curSI] = _curSI;
}
// Create state active variables
cofsm.StateActiveVars = new List<Variable>();
int j = 0;
for (int i = 0; i < stateList.Count; i++)
{
if (stateList[i].HasWaitState)
{
cofsm.StateActiveVars.Add(new Variable(typeof(bool))
{
Name = prefix + "_$waitStateActive" + i
});
stateList[i].WaitStateValue = j++;
}
cofsm.StateActiveVars.Add(new Variable(typeof(bool))
{
Name = prefix + "_$stateActive" + i
});
stateList[i].StateValue = j++;
}
int numStates = j;
// Replace ProceedWithState calls with actual states
var states = new Statement[numStates];
j = 0;
for (int i = 0; i < stateList.Count; i++)
{
if (stateList[i].HasWaitState)
{
var wsb = new DefaultAlgorithmBuilder();
ImplementJoin(stateList[i].JP, wsb, stateList[i]);
//wsb.Call(stateList[i].JoinSpec, new Expression[0]);
var join = wsb.Complete();
states[j++] = join.Body;
}
states[j++] = stateList[i].Result.Decompiled.Body;
}
for (j = 0; j < states.Length; j++)
{
var orgBody = states[j];
var xform = new CoStateAssigner(this, cofsm.StateActiveVars, orgBody, j);
var state = xform.GetAlgorithm();
states[j] = state.Body;
}
var calledMethods = stateList
.SelectMany(b => b.Result.CalledMethods)
.Distinct()
.ToList();
var calledSyncMethods = calledMethods
.Where(mci => !mci.Method.IsAsync())
.ToList();
cofsm.CalledMethods = calledSyncMethods;
// State handlers
var alg = new DefaultAlgorithmBuilder();
alg.Store(cofsm.DoneVar, LiteralReference.CreateConstant(false));
for (int i = states.Length - 1; i >= 1; i--)
{
var lrsa = (LiteralReference)cofsm.StateActiveVars[i];
alg.If(lrsa);
alg.InlineCall(states[i]);
alg.EndIf();
}
var handlerAlg = alg.Complete();
cofsm.HandlerBody = handlerAlg.Body;
alg = new DefaultAlgorithmBuilder();
alg.Store(cofsm.DoneVar, LiteralReference.CreateConstant(false));
alg.InlineCall(states[0]);
cofsm.InitialHandler = alg.Complete().Body;
return cofsm;
}
