bool ObjCMethodCall::canBeOverridenInSubclass(ObjCInterfaceDecl *IDecl,
Selector Sel) const {
assert(IDecl);
const SourceManager &SM =
getState()->getStateManager().getContext().getSourceManager();
// If the class interface is declared inside the main file, assume it is not
// subcassed.
// TODO: It could actually be subclassed if the subclass is private as well.
// This is probably very rare.
SourceLocation InterfLoc = IDecl->getEndOfDefinitionLoc();
if (InterfLoc.isValid() && SM.isFromMainFile(InterfLoc))
return false;
// Assume that property accessors are not overridden.
if (getMessageKind() == OCM_PropertyAccess)
return false;
// We assume that if the method is public (declared outside of main file) or
// has a parent which publicly declares the method, the method could be
// overridden in a subclass.
// Find the first declaration in the class hierarchy that declares
// the selector.
ObjCMethodDecl *D = 0;
while (true) {
D = IDecl->lookupMethod(Sel, true);
// Cannot find a public definition.
if (!D)
return false;
// If outside the main file,
if (D->getLocation().isValid() && !SM.isFromMainFile(D->getLocation()))
return true;
if (D->isOverriding()) {
// Search in the superclass on the next iteration.
IDecl = D->getClassInterface();
if (!IDecl)
return false;
IDecl = IDecl->getSuperClass();
if (!IDecl)
return false;
continue;
}
return false;
};
llvm_unreachable("The while loop should always terminate.");
}
/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
/// objective C interface. This is a property reference expression.
ExprResult Sema::
HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
Expr *BaseExpr, DeclarationName MemberName,
SourceLocation MemberLoc,
SourceLocation SuperLoc, QualType SuperType,
bool Super) {
const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
ObjCInterfaceDecl *IFace = IFaceT->getDecl();
IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
if (IFace->isForwardDecl()) {
Diag(MemberLoc, diag::err_property_not_found_forward_class)
<< MemberName << QualType(OPT, 0);
Diag(IFace->getLocation(), diag::note_forward_class);
return ExprError();
}
// Search for a declared property first.
if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
// Check whether we can reference this property.
if (DiagnoseUseOfDecl(PD, MemberLoc))
return ExprError();
QualType ResTy = PD->getType();
Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc))
ResTy = Getter->getResultType();
if (Super)
return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
VK_LValue, OK_ObjCProperty,
MemberLoc,
SuperLoc, SuperType));
else
return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
VK_LValue, OK_ObjCProperty,
MemberLoc, BaseExpr));
}
// Check protocols on qualified interfaces.
for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
E = OPT->qual_end(); I != E; ++I)
if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
// Check whether we can reference this property.
if (DiagnoseUseOfDecl(PD, MemberLoc))
return ExprError();
if (Super)
return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
VK_LValue,
OK_ObjCProperty,
MemberLoc,
SuperLoc, SuperType));
else
return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
VK_LValue,
OK_ObjCProperty,
MemberLoc,
BaseExpr));
}
// If that failed, look for an "implicit" property by seeing if the nullary
// selector is implemented.
// FIXME: The logic for looking up nullary and unary selectors should be
// shared with the code in ActOnInstanceMessage.
Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
// May be founf in property's qualified list.
if (!Getter)
Getter = LookupMethodInQualifiedType(Sel, OPT, true);
// If this reference is in an @implementation, check for 'private' methods.
if (!Getter)
Getter = IFace->lookupPrivateMethod(Sel);
// Look through local category implementations associated with the class.
if (!Getter)
Getter = IFace->getCategoryInstanceMethod(Sel);
if (Getter) {
// Check if we can reference this property.
if (DiagnoseUseOfDecl(Getter, MemberLoc))
return ExprError();
}
// If we found a getter then this may be a valid dot-reference, we
// will look for the matching setter, in case it is needed.
Selector SetterSel =
SelectorTable::constructSetterName(PP.getIdentifierTable(),
PP.getSelectorTable(), Member);
ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
// May be founf in property's qualified list.
if (!Setter)
Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
if (!Setter) {
// If this reference is in an @implementation, also check for 'private'
// methods.
Setter = IFace->lookupPrivateMethod(SetterSel);
}
// Look through local category implementations associated with the class.
if (!Setter)
Setter = IFace->getCategoryInstanceMethod(SetterSel);
if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
return ExprError();
if (Getter || Setter) {
QualType PType;
if (Getter)
PType = Getter->getSendResultType();
else {
ParmVarDecl *ArgDecl = *Setter->param_begin();
PType = ArgDecl->getType();
}
ExprValueKind VK = VK_LValue;
ExprObjectKind OK = OK_ObjCProperty;
if (!getLangOptions().CPlusPlus && !PType.hasQualifiers() &&
PType->isVoidType())
VK = VK_RValue, OK = OK_Ordinary;
if (Super)
return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
PType, VK, OK,
MemberLoc,
SuperLoc, SuperType));
else
return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
PType, VK, OK,
MemberLoc, BaseExpr));
}
// Attempt to correct for typos in property names.
LookupResult Res(*this, MemberName, MemberLoc, LookupOrdinaryName);
if (CorrectTypo(Res, 0, 0, IFace, false, CTC_NoKeywords, OPT) &&
Res.getAsSingle<ObjCPropertyDecl>()) {
DeclarationName TypoResult = Res.getLookupName();
Diag(MemberLoc, diag::err_property_not_found_suggest)
<< MemberName << QualType(OPT, 0) << TypoResult
<< FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString());
ObjCPropertyDecl *Property = Res.getAsSingle<ObjCPropertyDecl>();
Diag(Property->getLocation(), diag::note_previous_decl)
<< Property->getDeclName();
return HandleExprPropertyRefExpr(OPT, BaseExpr, TypoResult, MemberLoc,
SuperLoc, SuperType, Super);
}
ObjCInterfaceDecl *ClassDeclared;
if (ObjCIvarDecl *Ivar =
IFace->lookupInstanceVariable(Member, ClassDeclared)) {
QualType T = Ivar->getType();
if (const ObjCObjectPointerType * OBJPT =
T->getAsObjCInterfacePointerType()) {
const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
if (ObjCInterfaceDecl *IFace = IFaceT->getDecl())
if (IFace->isForwardDecl()) {
Diag(MemberLoc, diag::err_property_not_as_forward_class)
<< MemberName << IFace;
Diag(IFace->getLocation(), diag::note_forward_class);
return ExprError();
}
}
}
Diag(MemberLoc, diag::err_property_not_found)
<< MemberName << QualType(OPT, 0);
if (Setter)
Diag(Setter->getLocation(), diag::note_getter_unavailable)
<< MemberName << BaseExpr->getSourceRange();
return ExprError();
}
/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
/// objective C interface. This is a property reference expression.
Action::OwningExprResult Sema::
HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
Expr *BaseExpr, DeclarationName MemberName,
SourceLocation MemberLoc) {
const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
ObjCInterfaceDecl *IFace = IFaceT->getDecl();
IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
// Search for a declared property first.
if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
// Check whether we can reference this property.
if (DiagnoseUseOfDecl(PD, MemberLoc))
return ExprError();
QualType ResTy = PD->getType();
Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
if (DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc))
ResTy = Getter->getSendResultType();
return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
MemberLoc, BaseExpr));
}
// Check protocols on qualified interfaces.
for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
E = OPT->qual_end(); I != E; ++I)
if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
// Check whether we can reference this property.
if (DiagnoseUseOfDecl(PD, MemberLoc))
return ExprError();
return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
MemberLoc, BaseExpr));
}
// If that failed, look for an "implicit" property by seeing if the nullary
// selector is implemented.
// FIXME: The logic for looking up nullary and unary selectors should be
// shared with the code in ActOnInstanceMessage.
Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
// If this reference is in an @implementation, check for 'private' methods.
if (!Getter)
Getter = IFace->lookupPrivateInstanceMethod(Sel);
// Look through local category implementations associated with the class.
if (!Getter)
Getter = IFace->getCategoryInstanceMethod(Sel);
if (Getter) {
// Check if we can reference this property.
if (DiagnoseUseOfDecl(Getter, MemberLoc))
return ExprError();
}
// If we found a getter then this may be a valid dot-reference, we
// will look for the matching setter, in case it is needed.
Selector SetterSel =
SelectorTable::constructSetterName(PP.getIdentifierTable(),
PP.getSelectorTable(), Member);
ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
if (!Setter) {
// If this reference is in an @implementation, also check for 'private'
// methods.
Setter = IFace->lookupPrivateInstanceMethod(SetterSel);
}
// Look through local category implementations associated with the class.
if (!Setter)
Setter = IFace->getCategoryInstanceMethod(SetterSel);
if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
return ExprError();
if (Getter) {
QualType PType;
PType = Getter->getSendResultType();
return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter, PType,
Setter, MemberLoc, BaseExpr));
}
// Attempt to correct for typos in property names.
LookupResult Res(*this, MemberName, MemberLoc, LookupOrdinaryName);
if (CorrectTypo(Res, 0, 0, IFace, false, CTC_NoKeywords, OPT) &&
Res.getAsSingle<ObjCPropertyDecl>()) {
DeclarationName TypoResult = Res.getLookupName();
Diag(MemberLoc, diag::err_property_not_found_suggest)
<< MemberName << QualType(OPT, 0) << TypoResult
<< FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString());
ObjCPropertyDecl *Property = Res.getAsSingle<ObjCPropertyDecl>();
Diag(Property->getLocation(), diag::note_previous_decl)
<< Property->getDeclName();
return HandleExprPropertyRefExpr(OPT, BaseExpr, TypoResult, MemberLoc);
}
Diag(MemberLoc, diag::err_property_not_found)
<< MemberName << QualType(OPT, 0);
if (Setter && !Getter)
Diag(Setter->getLocation(), diag::note_getter_unavailable)
<< MemberName << BaseExpr->getSourceRange();
return ExprError();
}