////////////////////////////////////////////////////////////////////////////////
// Sets the isAssigned bit
protected void markFieldAssigned(EXPR expr)
{
if (expr.isFIELD() && 0 != (expr.flags & EXPRFLAG.EXF_LVALUE))
{
EXPRFIELD field;
do
{
field = expr.asFIELD();
field.fwt.Field().isAssigned = true;
expr = field.GetOptionalObject();
}
while (field.fwt.Field().getClass().IsStruct() && !field.fwt.Field().isStatic && expr != null && expr.isFIELD());
}
}
// Return true if we actually report a failure.
protected bool TryReportLvalueFailure(EXPR expr, CheckLvalueKind kind)
{
Debug.Assert(expr != null);
// We have a lvalue failure. Was the reason because this field
// was marked readonly? Give special messages for this case.
bool isNested = false; // Did we recurse on a field or property to give a better error?
EXPR walk = expr;
while (true)
{
Debug.Assert(walk != null);
if (walk.isANYLOCAL_OK())
{
ReportLocalError(walk.asANYLOCAL().local, kind, isNested);
return(true);
}
EXPR pObject = null;
if (walk.isPROP())
{
// We've already reported read-only-property errors.
Debug.Assert(walk.asPROP().mwtSet != null);
pObject = walk.asPROP().GetMemberGroup().GetOptionalObject();
}
else if (walk.isFIELD())
{
EXPRFIELD field = walk.asFIELD();
if (field.fwt.Field().isReadOnly)
{
ReportReadOnlyError(field, kind, isNested);
return(true);
}
if (!field.fwt.Field().isStatic)
{
pObject = field.GetOptionalObject();
}
}
if (pObject != null && pObject.type.isStructOrEnum())
{
if (pObject.isCALL() || pObject.isPROP())
{
// assigning to RHS of method or property getter returning a value-type on the stack or
// passing RHS of method or property getter returning a value-type on the stack, as ref or out
ErrorContext.Error(ErrorCode.ERR_ReturnNotLValue, pObject.GetSymWithType());
return(true);
}
if (pObject.isCAST())
{
// An unboxing conversion.
//
// In the static compiler, we give the following error here:
// ErrorContext.Error(pObject.GetTree(), ErrorCode.ERR_UnboxNotLValue);
//
// But in the runtime, we allow this - mark that we're doing an
// unbox here, so that we gen the correct expression tree for it.
pObject.flags |= EXPRFLAG.EXF_UNBOXRUNTIME;
return(false);
}
}
// everything else
if (pObject != null && !pObject.isLvalue() && (walk.isFIELD() || (!isNested && walk.isPROP())))
{
Debug.Assert(pObject.type.isStructOrEnum());
walk = pObject;
}
else
{
ErrorContext.Error(GetStandardLvalueError(kind));
return(true);
}
isNested = true;
}
}
private EXPR AdjustMemberObject(SymWithType swt, EXPR pObject, out bool pfConstrained, out bool pIsMatchingStatic)
{
// Assert that the type is present and is an instantiation of the member's parent.
Debug.Assert(swt.GetType() != null && swt.GetType().getAggregate() == swt.Sym.parent.AsAggregateSymbol());
bool bIsMatchingStatic = IsMatchingStatic(swt, pObject);
pIsMatchingStatic = bIsMatchingStatic;
pfConstrained = false;
bool isStatic = swt.Sym.isStatic;
// If our static doesn't match, bail out of here.
if (!bIsMatchingStatic)
{
if (isStatic)
{
// If we have a mismatched static, a static method, and the binding flag
// that tells us we're binding simple names, then insert a type here instead.
if ((pObject.flags & EXPRFLAG.EXF_SIMPLENAME) != 0)
{
// We've made the static match now.
pIsMatchingStatic = true;
return null;
}
else
{
ErrorContext.ErrorRef(ErrorCode.ERR_ObjectProhibited, swt);
return null;
}
}
else
{
ErrorContext.ErrorRef(ErrorCode.ERR_ObjectRequired, swt);
return pObject;
}
}
// At this point, all errors for static invocations have been reported, and
// the object has been nulled out. So return out of here.
if (isStatic)
{
return null;
}
// If we're in a constructor, then bail.
if (swt.Sym.IsMethodSymbol() && swt.Meth().IsConstructor())
{
return pObject;
}
if (pObject == null)
{
if (InFieldInitializer() && !InStaticMethod() && ContainingAgg() == swt.Sym.parent)
{
ErrorContext.ErrorRef(ErrorCode.ERR_FieldInitRefNonstatic, swt); // give better error message for common mistake <BUGNUM>See VS7:119218</BUGNUM>
}
else if (InAnonymousMethod() && !InStaticMethod() && ContainingAgg() == swt.Sym.parent && ContainingAgg().IsStruct())
{
ErrorContext.Error(ErrorCode.ERR_ThisStructNotInAnonMeth);
}
else
{
return null;
}
// For fields or structs, make a this pointer for us to use.
EXPRTHISPOINTER thisExpr = GetExprFactory().CreateThis(Context.GetThisPointer(), true);
thisExpr.SetMismatchedStaticBit();
if (thisExpr.type == null)
{
thisExpr.setType(GetTypes().GetErrorSym());
}
return thisExpr;
}
CType typeObj = pObject.type;
CType typeTmp;
if (typeObj.IsNullableType() && (typeTmp = typeObj.AsNullableType().GetAts(GetErrorContext())) != null && typeTmp != swt.GetType())
{
typeObj = typeTmp;
}
if (typeObj.IsTypeParameterType() || typeObj.IsAggregateType())
{
AggregateSymbol aggCalled = null;
aggCalled = swt.Sym.parent.AsAggregateSymbol();
Debug.Assert(swt.GetType().getAggregate() == aggCalled);
// If we're invoking code on a struct-valued field, mark the struct as assigned (to
// avoid warning CS0649).
if (pObject.isFIELD() && !pObject.asFIELD().fwt.Field().isAssigned && !swt.Sym.IsFieldSymbol() &&
typeObj.isStructType() && !typeObj.isPredefined())
{
pObject.asFIELD().fwt.Field().isAssigned = true;
}
if (pfConstrained &&
(typeObj.IsTypeParameterType() ||
typeObj.isStructType() && swt.GetType().IsRefType() && swt.Sym.IsVirtual()))
{
// For calls on type parameters or virtual calls on struct types (not enums),
// use the constrained prefix.
pfConstrained = true;
}
EXPR objNew = tryConvert(pObject, swt.GetType(), CONVERTTYPE.NOUDC);
// This check ensures that we do not bind to methods in an outer class
// which are visible, but whose this pointer is of an incorrect type...
// ... also handles case of calling an pObject method on a RefAny value.
// WE don't give a great message for this, but it'll do.
if (objNew == null)
{
if (!pObject.type.isSpecialByRefType())
{
ErrorContext.Error(ErrorCode.ERR_WrongNestedThis, swt.GetType(), pObject.type);
}
else
{
ErrorContext.Error(ErrorCode.ERR_NoImplicitConv, pObject.type, swt.GetType());
}
}
pObject = objNew;
}
return pObject;
}