public static MethodSpec GetConstructor(TypeSpec nullableType)
{
return((MethodSpec)MemberCache.FindMember(nullableType,
MemberFilter.Constructor(ParametersCompiled.CreateFullyResolved(GetUnderlyingType(nullableType))), BindingRestriction.DeclaredOnly));
}
public static MethodSpec GetHasValue(TypeSpec nullableType)
{
return((MethodSpec)MemberCache.FindMember(nullableType,
MemberFilter.Method("get_HasValue", 0, ParametersCompiled.EmptyReadOnlyParameters, null), BindingRestriction.None));
}
public override bool Resolve(BlockContext bc)
{
if (bc.CurrentBlock is Linq.QueryBlock)
{
bc.Report.Error(1995, loc,
"The `await' operator may only be used in a query expression within the first collection expression of the initial `from' clause or within the collection expression of a `join' clause");
return(false);
}
if (!base.Resolve(bc))
{
return(false);
}
Arguments args = new Arguments(0);
type = expr.Type;
//
// The await expression is of dynamic type
//
if (type.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
{
result_type = type;
expr = new Invocation(new MemberAccess(expr, "GetAwaiter"), args).Resolve(bc);
return(true);
}
//
// Check whether the expression is awaitable
//
Expression ama = new AwaitableMemberAccess(expr).Resolve(bc);
if (ama == null)
{
return(false);
}
var errors_printer = new SessionReportPrinter();
var old = bc.Report.SetPrinter(errors_printer);
ama = new Invocation(ama, args).Resolve(bc);
bc.Report.SetPrinter(old);
if (errors_printer.ErrorsCount > 0 || !MemberAccess.IsValidDotExpression(ama.Type))
{
bc.Report.Error(1986, expr.Location,
"The `await' operand type `{0}' must have suitable GetAwaiter method",
expr.Type.GetSignatureForError());
return(false);
}
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;
if (get_result == null)
{
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))
{
bc.Report.Error(4027, loc, "The awaiter type `{0}' must implement interface `{1}'",
awaiter_type.GetSignatureForError(), nc.GetSignatureForError());
return(false);
}
result_type = get_result.ReturnType;
return(true);
}
public static MethodSpec GetConstructor(TypeSpec delType)
{
var ctor = MemberCache.FindMember(delType, MemberFilter.Constructor(null), BindingRestriction.DeclaredOnly);
return((MethodSpec)ctor);
}
void EmitActionLoad(EmitContext ec)
{
ec.EmitThis();
ec.Emit(OpCodes.Ldftn, StateMachineMethod.Spec);
ec.Emit(OpCodes.Newobj, (MethodSpec)MemberCache.FindMember(action, MemberFilter.Constructor(null), BindingRestriction.DeclaredOnly));
}
public override bool Resolve(BlockContext bc)
{
if (!base.Resolve(bc))
{
return(false);
}
Arguments args = new Arguments(0);
type = expr.Type;
//
// The await expression is of dynamic type
//
if (type.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
{
result_type = type;
awaiter = ((AsyncTaskStorey)machine_initializer.Storey).AddAwaiter(type, loc);
expr = new Invocation(new MemberAccess(expr, "GetAwaiter"), args).Resolve(bc);
return(true);
}
//
// Check whether the expression is awaitable
//
Expression ama = new AwaitableMemberAccess(expr).Resolve(bc);
if (ama == null)
{
return(false);
}
var errors_printer = new SessionReportPrinter();
var old = bc.Report.SetPrinter(errors_printer);
ama = new Invocation(ama, args).Resolve(bc);
bc.Report.SetPrinter(old);
if (errors_printer.ErrorsCount > 0 || !MemberAccess.IsValidDotExpression(ama.Type))
{
bc.Report.Error(1986, expr.Location,
"The `await' operand type `{0}' must have suitable GetAwaiter method",
expr.Type.GetSignatureForError());
return(false);
}
var awaiter_type = ama.Type;
awaiter = ((AsyncTaskStorey)machine_initializer.Storey).AddAwaiter(awaiter_type, loc);
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: OnCompleted (Action)
//
if (bc.Module.PredefinedTypes.Action.Define())
{
on_completed = MemberCache.FindMember(awaiter_type, MemberFilter.Method("OnCompleted", 0,
ParametersCompiled.CreateFullyResolved(bc.Module.PredefinedTypes.Action.TypeSpec), bc.Module.Compiler.BuiltinTypes.Void),
BindingRestriction.InstanceOnly) as MethodSpec;
if (on_completed == null)
{
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;
if (get_result == null)
{
Error_WrongAwaiterPattern(bc, awaiter_type);
return(false);
}
result_type = get_result.ReturnType;
return(true);
}
/// <summary>
/// This function tells whether one of our base classes implements
/// the given method (which turns out, it is valid to have an interface
/// implementation in a base
/// </summary>
bool BaseImplements(TypeSpec iface_type, MethodSpec mi, out MethodSpec base_method)
{
base_method = null;
bool base_can_implement = true;
TypeSpec lookup_type;
//
// Special handling for properties/indexers which cannot have accessors
// implementing an interface found in different types (e.g. current and base)
//
if (mi.IsAccessor && container.Interfaces != null)
{
bool new_implementation = false;
foreach (var iface in container.Interfaces)
{
if (TypeSpecComparer.IsEqual(iface, iface_type))
{
new_implementation = true;
break;
}
}
if (new_implementation)
{
MemberFilter filter;
bool getter = mi.Name [0] == 'g';
if (mi.Parameters.Count > (getter ? 0 : 1))
{
var indexer_params = getter ? mi.Parameters : IndexerSpec.CreateParametersFromSetter(mi, mi.Parameters.Count - 1);
var ptype = getter ? mi.ReturnType : mi.Parameters.Types [mi.Parameters.Count - 1];
filter = new MemberFilter(MemberCache.IndexerNameAlias, 0, MemberKind.Indexer, indexer_params, ptype);
}
else
{
var pname = mi.Name.Substring(4);
var ptype = getter ? mi.ReturnType : mi.Parameters.Types [0];
filter = MemberFilter.Property(pname, ptype);
}
var prop = MemberCache.FindMember(container.CurrentType, filter, BindingRestriction.DeclaredOnly | BindingRestriction.InstanceOnly);
if (prop != null && (prop.Modifiers & Modifiers.NEW) != 0)
{
base_can_implement = false;
}
}
}
if (base_can_implement)
{
lookup_type = container.BaseType;
if (lookup_type.ImplementsInterface(iface_type, false))
{
return(true);
}
}
else
{
lookup_type = container.CurrentType;
}
//
// Setup filter with no return type to give better error message
// about mismatch at return type when the check bellow rejects them
//
var parameters = mi.Parameters;
MethodSpec close_match = null;
while (true)
{
var candidates = MemberCache.FindMembers(lookup_type, mi.Name, !base_can_implement);
if (candidates == null)
{
base_method = close_match;
return(false);
}
MethodSpec similar_candidate = null;
foreach (var candidate in candidates)
{
if (candidate.Kind != MemberKind.Method)
{
continue;
}
if (candidate.Arity != mi.Arity)
{
continue;
}
var candidate_param = ((MethodSpec)candidate).Parameters;
if (!TypeSpecComparer.Override.IsEqual(parameters.Types, candidate_param.Types))
{
continue;
}
bool modifiers_match = true;
for (int i = 0; i < parameters.Count; ++i)
{
//
// First check exact ref/out match
//
if ((parameters.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) == (candidate_param.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
{
continue;
}
modifiers_match = false;
//
// Different in ref/out only
//
if ((parameters.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) != (candidate_param.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
{
if (similar_candidate == null)
{
if (!candidate.IsPublic)
{
break;
}
if (!TypeSpecComparer.Override.IsEqual(mi.ReturnType, ((MethodSpec)candidate).ReturnType))
{
break;
}
// It's used for ref/out ambiguity overload check
similar_candidate = (MethodSpec)candidate;
}
continue;
}
similar_candidate = null;
break;
}
if (!modifiers_match)
{
continue;
}
//
// From this point the candidate is used for detailed error reporting
// because it's very close match to what we are looking for
//
var m = (MethodSpec)candidate;
if (!m.IsPublic)
{
if (close_match == null)
{
close_match = m;
}
continue;
}
if (!TypeSpecComparer.Override.IsEqual(mi.ReturnType, m.ReturnType))
{
if (close_match == null)
{
close_match = m;
}
continue;
}
base_method = m;
if (mi.IsGeneric && !Method.CheckImplementingMethodConstraints(container, m, mi))
{
return(true);
}
}
if (base_method != null)
{
if (similar_candidate != null)
{
Report.SymbolRelatedToPreviousError(similar_candidate);
Report.SymbolRelatedToPreviousError(mi);
Report.SymbolRelatedToPreviousError(container);
Report.Warning(1956, 1, ((MemberCore)base_method.MemberDefinition).Location,
"The interface method `{0}' implementation is ambiguous between following methods: `{1}' and `{2}' in type `{3}'",
mi.GetSignatureForError(), base_method.GetSignatureForError(), similar_candidate.GetSignatureForError(), container.GetSignatureForError());
}
break;
}
if (!base_can_implement)
{
return(false);
}
lookup_type = candidates[0].DeclaringType.BaseType;
if (lookup_type == null)
{
base_method = close_match;
return(false);
}
}
if (!base_method.IsVirtual)
{
#if STATIC
var base_builder = base_method.GetMetaInfo() as MethodBuilder;
if (base_builder != null)
{
//
// We can avoid creating a proxy if base_method can be marked 'final virtual'. This can
// be done for all methods from compiled assembly
//
base_builder.__SetAttributes(base_builder.Attributes | MethodAttributes.Virtual | MethodAttributes.Final | MethodAttributes.NewSlot);
return(true);
}
#endif
DefineProxy(iface_type, base_method, mi);
}
return(true);
}
public override bool Resolve(BlockContext bc)
{
if (!base.Resolve(bc))
{
return(false);
}
type = expr.Type;
//
// The task result is of dynamic type
//
if (expr.Type.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
{
throw new NotImplementedException("dynamic await");
}
//
// Check whether the expression is awaitable
//
Expression ama = new AwaitableMemberAccess(expr).Resolve(bc);
if (ama == null)
{
return(false);
}
Arguments args = new Arguments(0);
var errors_printer = new SessionReportPrinter();
var old = bc.Report.SetPrinter(errors_printer);
ama = new Invocation(ama, args).Resolve(bc);
if (errors_printer.ErrorsCount > 0 || !MemberAccess.IsValidDotExpression(ama.Type))
{
bc.Report.SetPrinter(old);
Error_WrongGetAwaiter(bc, loc, expr.Type);
return(false);
}
var awaiter_type = ama.Type;
awaiter = ((AsyncTaskStorey)machine_initializer.Storey).AddAwaiter(awaiter_type, loc);
expr = ama;
//
// Predefined: bool IsCompleted { get; }
//
var is_completed_ma = new MemberAccess(expr, "IsCompleted").Resolve(bc);
if (is_completed_ma != null)
{
is_completed = is_completed_ma as PropertyExpr;
if (is_completed != null && is_completed.Type.BuiltinType == BuiltinTypeSpec.Type.Bool && is_completed.IsInstance && is_completed.Getter != null)
{
// valid
}
else
{
bc.Report.SetPrinter(old);
Error_WrongAwaiterPattern(bc, awaiter_type);
return(false);
}
}
bc.Report.SetPrinter(old);
if (errors_printer.ErrorsCount > 0)
{
Error_WrongAwaiterPattern(bc, awaiter_type);
return(false);
}
//
// Predefined: OnCompleted (Action)
//
if (bc.Module.PredefinedTypes.Action.Define())
{
on_completed = MemberCache.FindMember(awaiter_type, MemberFilter.Method("OnCompleted", 0,
ParametersCompiled.CreateFullyResolved(bc.Module.PredefinedTypes.Action.TypeSpec), bc.Module.Compiler.BuiltinTypes.Void),
BindingRestriction.InstanceOnly) as MethodSpec;
if (on_completed == null)
{
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;
if (get_result == null)
{
Error_WrongAwaiterPattern(bc, awaiter_type);
return(false);
}
return(true);
}
public static MethodSpec GetGetValueOrDefault(TypeSpec nullableType)
{
return (MethodSpec) MemberCache.FindMember (nullableType,
MemberFilter.Method ("GetValueOrDefault", 0, ParametersCompiled.EmptyReadOnlyParameters, null), BindingRestriction.None);
}