public class AwaitStatement : YieldStatement<AsyncInitializer>
{
- sealed class AwaitableMemberAccess : MemberAccess
+ public sealed class AwaitableMemberAccess : MemberAccess
{
public AwaitableMemberAccess (Expression expr)
: base (expr, "GetAwaiter")
{
}
+ public bool ProbingMode { get; set; }
+
protected override void Error_TypeDoesNotContainDefinition (ResolveContext rc, TypeSpec type, string name)
{
Error_OperatorCannotBeApplied (rc, type);
protected override void Error_OperatorCannotBeApplied (ResolveContext rc, TypeSpec type)
{
+ if (ProbingMode)
+ return;
+
var invocation = LeftExpression as Invocation;
if (invocation != null && invocation.MethodGroup != null && (invocation.MethodGroup.BestCandidate.Modifiers & Modifiers.ASYNC) != 0) {
rc.Report.Error (4008, loc, "Cannot await void method `{0}'. Consider changing method return type to `Task'",
}
Field awaiter;
- PropertySpec is_completed;
- MethodSpec get_result;
+ AwaiterDefinition awaiter_definition;
TypeSpec type;
TypeSpec result_type;
bool IsDynamic {
get {
- return is_completed == null;
+ return awaiter_definition == null;
}
}
if (IsDynamic) {
var rc = new ResolveContext (ec.MemberContext);
return new Invocation (new MemberAccess (fe_awaiter, "GetResult"), new Arguments (0)).Resolve (rc);
- } else {
- var mg_result = MethodGroupExpr.CreatePredefined (get_result, fe_awaiter.Type, loc);
- mg_result.InstanceExpression = fe_awaiter;
-
- return new GetResultInvocation (mg_result, new Arguments (0));
}
+
+ var mg_result = MethodGroupExpr.CreatePredefined (awaiter_definition.GetResult, fe_awaiter.Type, loc);
+ mg_result.InstanceExpression = fe_awaiter;
+
+ return new GetResultInvocation (mg_result, new Arguments (0));
}
public void EmitPrologue (EmitContext ec)
dargs.Add (new Argument (completed_expr));
completed_expr = new DynamicConversion (ec.Module.Compiler.BuiltinTypes.Bool, 0, dargs, loc).Resolve (rc);
} else {
- var pe = PropertyExpr.CreatePredefined (is_completed, loc);
+ var pe = PropertyExpr.CreatePredefined (awaiter_definition.IsCompleted, loc);
pe.InstanceExpression = fe_awaiter;
completed_expr = pe;
}
if (!base.Resolve (bc))
return false;
- Arguments args = new Arguments (0);
-
type = expr.Type;
+ Arguments args = new Arguments (0);
//
// The await expression is of dynamic type
}
var awaiter_type = ama.Type;
- expr = ama;
-
- //
- // Predefined: bool IsCompleted { get; }
- //
- is_completed = MemberCache.FindMember (awaiter_type, MemberFilter.Property ("IsCompleted", bc.Module.Compiler.BuiltinTypes.Bool),
- BindingRestriction.InstanceOnly) as PropertySpec;
- if (is_completed == null || !is_completed.HasGet) {
- Error_WrongAwaiterPattern (bc, awaiter_type);
- return false;
- }
-
- //
- // Predefined: GetResult ()
- //
- // The method return type is also result type of await expression
- //
- get_result = MemberCache.FindMember (awaiter_type, MemberFilter.Method ("GetResult", 0,
- ParametersCompiled.EmptyReadOnlyParameters, null),
- BindingRestriction.InstanceOnly) as MethodSpec;
+ awaiter_definition = bc.Module.GetAwaiter (awaiter_type);
- if (get_result == null) {
+ if (!awaiter_definition.IsValidPattern) {
Error_WrongAwaiterPattern (bc, awaiter_type);
return false;
}
- //
- // Predefined: INotifyCompletion.OnCompleted (System.Action)
- //
- var nc = bc.Module.PredefinedTypes.INotifyCompletion;
- if (nc.Define () && !awaiter_type.ImplementsInterface (nc.TypeSpec, false)) {
+ if (!awaiter_definition.INotifyCompletion) {
bc.Report.Error (4027, loc, "The awaiter type `{0}' must implement interface `{1}'",
- awaiter_type.GetSignatureForError (), nc.GetSignatureForError ());
+ awaiter_type.GetSignatureForError (), bc.Module.PredefinedTypes.INotifyCompletion.GetSignatureForError ());
return false;
}
- result_type = get_result.ReturnType;
+ expr = ama;
+ result_type = awaiter_definition.GetResult.ReturnType;
return true;
}
}
}
+ public TypeSpec DelegateType {
+ get; set;
+ }
+
public override bool IsIterator {
get {
return false;