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SemaDeclObjC.cpp
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//===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC Declarations -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for Objective C declarations.
//
//===----------------------------------------------------------------------===//
#include "TypeLocBuilder.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/Sema/SemaInternal.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
using namespace clang;
/// Check whether the given method, which must be in the 'init'
/// family, is a valid member of that family.
///
/// \param receiverTypeIfCall - if null, check this as if declaring it;
/// if non-null, check this as if making a call to it with the given
/// receiver type
///
/// \return true to indicate that there was an error and appropriate
/// actions were taken
bool Sema::checkInitMethod(ObjCMethodDecl *method,
QualType receiverTypeIfCall) {
if (method->isInvalidDecl()) return true;
// This castAs is safe: methods that don't return an object
// pointer won't be inferred as inits and will reject an explicit
// objc_method_family(init).
// We ignore protocols here. Should we? What about Class?
const ObjCObjectType *result =
method->getReturnType()->castAs<ObjCObjectPointerType>()->getObjectType();
if (result->isObjCId()) {
return false;
} else if (result->isObjCClass()) {
// fall through: always an error
} else {
ObjCInterfaceDecl *resultClass = result->getInterface();
assert(resultClass && "unexpected object type!");
// It's okay for the result type to still be a forward declaration
// if we're checking an interface declaration.
if (!resultClass->hasDefinition()) {
if (receiverTypeIfCall.isNull() &&
!isa<ObjCImplementationDecl>(method->getDeclContext()))
return false;
// Otherwise, we try to compare class types.
} else {
// If this method was declared in a protocol, we can't check
// anything unless we have a receiver type that's an interface.
const ObjCInterfaceDecl *receiverClass = nullptr;
if (isa<ObjCProtocolDecl>(method->getDeclContext())) {
if (receiverTypeIfCall.isNull())
return false;
receiverClass = receiverTypeIfCall->castAs<ObjCObjectPointerType>()
->getInterfaceDecl();
// This can be null for calls to e.g. id<Foo>.
if (!receiverClass) return false;
} else {
receiverClass = method->getClassInterface();
assert(receiverClass && "method not associated with a class!");
}
// If either class is a subclass of the other, it's fine.
if (receiverClass->isSuperClassOf(resultClass) ||
resultClass->isSuperClassOf(receiverClass))
return false;
}
}
SourceLocation loc = method->getLocation();
// If we're in a system header, and this is not a call, just make
// the method unusable.
if (receiverTypeIfCall.isNull() && getSourceManager().isInSystemHeader(loc)) {
method->addAttr(UnavailableAttr::CreateImplicit(Context, "",
UnavailableAttr::IR_ARCInitReturnsUnrelated, loc));
return true;
}
// Otherwise, it's an error.
Diag(loc, diag::err_arc_init_method_unrelated_result_type);
method->setInvalidDecl();
return true;
}
void Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
const ObjCMethodDecl *Overridden) {
if (Overridden->hasRelatedResultType() &&
!NewMethod->hasRelatedResultType()) {
// This can only happen when the method follows a naming convention that
// implies a related result type, and the original (overridden) method has
// a suitable return type, but the new (overriding) method does not have
// a suitable return type.
QualType ResultType = NewMethod->getReturnType();
SourceRange ResultTypeRange = NewMethod->getReturnTypeSourceRange();
// Figure out which class this method is part of, if any.
ObjCInterfaceDecl *CurrentClass
= dyn_cast<ObjCInterfaceDecl>(NewMethod->getDeclContext());
if (!CurrentClass) {
DeclContext *DC = NewMethod->getDeclContext();
if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(DC))
CurrentClass = Cat->getClassInterface();
else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(DC))
CurrentClass = Impl->getClassInterface();
else if (ObjCCategoryImplDecl *CatImpl
= dyn_cast<ObjCCategoryImplDecl>(DC))
CurrentClass = CatImpl->getClassInterface();
}
if (CurrentClass) {
Diag(NewMethod->getLocation(),
diag::warn_related_result_type_compatibility_class)
<< Context.getObjCInterfaceType(CurrentClass)
<< ResultType
<< ResultTypeRange;
} else {
Diag(NewMethod->getLocation(),
diag::warn_related_result_type_compatibility_protocol)
<< ResultType
<< ResultTypeRange;
}
if (ObjCMethodFamily Family = Overridden->getMethodFamily())
Diag(Overridden->getLocation(),
diag::note_related_result_type_family)
<< /*overridden method*/ 0
<< Family;
else
Diag(Overridden->getLocation(),
diag::note_related_result_type_overridden);
}
if (getLangOpts().ObjCAutoRefCount) {
if ((NewMethod->hasAttr<NSReturnsRetainedAttr>() !=
Overridden->hasAttr<NSReturnsRetainedAttr>())) {
Diag(NewMethod->getLocation(),
diag::err_nsreturns_retained_attribute_mismatch) << 1;
Diag(Overridden->getLocation(), diag::note_previous_decl)
<< "method";
}
if ((NewMethod->hasAttr<NSReturnsNotRetainedAttr>() !=
Overridden->hasAttr<NSReturnsNotRetainedAttr>())) {
Diag(NewMethod->getLocation(),
diag::err_nsreturns_retained_attribute_mismatch) << 0;
Diag(Overridden->getLocation(), diag::note_previous_decl)
<< "method";
}
ObjCMethodDecl::param_const_iterator oi = Overridden->param_begin(),
oe = Overridden->param_end();
for (ObjCMethodDecl::param_iterator
ni = NewMethod->param_begin(), ne = NewMethod->param_end();
ni != ne && oi != oe; ++ni, ++oi) {
const ParmVarDecl *oldDecl = (*oi);
ParmVarDecl *newDecl = (*ni);
if (newDecl->hasAttr<NSConsumedAttr>() !=
oldDecl->hasAttr<NSConsumedAttr>()) {
Diag(newDecl->getLocation(),
diag::err_nsconsumed_attribute_mismatch);
Diag(oldDecl->getLocation(), diag::note_previous_decl)
<< "parameter";
}
}
}
}
/// \brief Check a method declaration for compatibility with the Objective-C
/// ARC conventions.
bool Sema::CheckARCMethodDecl(ObjCMethodDecl *method) {
ObjCMethodFamily family = method->getMethodFamily();
switch (family) {
case OMF_None:
case OMF_finalize:
case OMF_retain:
case OMF_release:
case OMF_autorelease:
case OMF_retainCount:
case OMF_self:
case OMF_initialize:
case OMF_performSelector:
return false;
case OMF_dealloc:
if (!Context.hasSameType(method->getReturnType(), Context.VoidTy)) {
SourceRange ResultTypeRange = method->getReturnTypeSourceRange();
if (ResultTypeRange.isInvalid())
Diag(method->getLocation(), diag::err_dealloc_bad_result_type)
<< method->getReturnType()
<< FixItHint::CreateInsertion(method->getSelectorLoc(0), "(void)");
else
Diag(method->getLocation(), diag::err_dealloc_bad_result_type)
<< method->getReturnType()
<< FixItHint::CreateReplacement(ResultTypeRange, "void");
return true;
}
return false;
case OMF_init:
// If the method doesn't obey the init rules, don't bother annotating it.
if (checkInitMethod(method, QualType()))
return true;
method->addAttr(NSConsumesSelfAttr::CreateImplicit(Context));
// Don't add a second copy of this attribute, but otherwise don't
// let it be suppressed.
if (method->hasAttr<NSReturnsRetainedAttr>())
return false;
break;
case OMF_alloc:
case OMF_copy:
case OMF_mutableCopy:
case OMF_new:
if (method->hasAttr<NSReturnsRetainedAttr>() ||
method->hasAttr<NSReturnsNotRetainedAttr>() ||
method->hasAttr<NSReturnsAutoreleasedAttr>())
return false;
break;
}
method->addAttr(NSReturnsRetainedAttr::CreateImplicit(Context));
return false;
}
static void DiagnoseObjCImplementedDeprecations(Sema &S, const NamedDecl *ND,
SourceLocation ImplLoc) {
if (!ND)
return;
bool IsCategory = false;
AvailabilityResult Availability = ND->getAvailability();
if (Availability != AR_Deprecated) {
if (isa<ObjCMethodDecl>(ND)) {
if (Availability != AR_Unavailable)
return;
// Warn about implementing unavailable methods.
S.Diag(ImplLoc, diag::warn_unavailable_def);
S.Diag(ND->getLocation(), diag::note_method_declared_at)
<< ND->getDeclName();
return;
}
if (const auto *CD = dyn_cast<ObjCCategoryDecl>(ND)) {
if (!CD->getClassInterface()->isDeprecated())
return;
ND = CD->getClassInterface();
IsCategory = true;
} else
return;
}
S.Diag(ImplLoc, diag::warn_deprecated_def)
<< (isa<ObjCMethodDecl>(ND)
? /*Method*/ 0
: isa<ObjCCategoryDecl>(ND) || IsCategory ? /*Category*/ 2
: /*Class*/ 1);
if (isa<ObjCMethodDecl>(ND))
S.Diag(ND->getLocation(), diag::note_method_declared_at)
<< ND->getDeclName();
else
S.Diag(ND->getLocation(), diag::note_previous_decl)
<< (isa<ObjCCategoryDecl>(ND) ? "category" : "class");
}
/// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
/// pool.
void Sema::AddAnyMethodToGlobalPool(Decl *D) {
ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D);
// If we don't have a valid method decl, simply return.
if (!MDecl)
return;
if (MDecl->isInstanceMethod())
AddInstanceMethodToGlobalPool(MDecl, true);
else
AddFactoryMethodToGlobalPool(MDecl, true);
}
/// HasExplicitOwnershipAttr - returns true when pointer to ObjC pointer
/// has explicit ownership attribute; false otherwise.
static bool
HasExplicitOwnershipAttr(Sema &S, ParmVarDecl *Param) {
QualType T = Param->getType();
if (const PointerType *PT = T->getAs<PointerType>()) {
T = PT->getPointeeType();
} else if (const ReferenceType *RT = T->getAs<ReferenceType>()) {
T = RT->getPointeeType();
} else {
return true;
}
// If we have a lifetime qualifier, but it's local, we must have
// inferred it. So, it is implicit.
return !T.getLocalQualifiers().hasObjCLifetime();
}
/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible
/// and user declared, in the method definition's AST.
void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) {
assert((getCurMethodDecl() == nullptr) && "Methodparsing confused");
ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D);
// If we don't have a valid method decl, simply return.
if (!MDecl)
return;
// Allow all of Sema to see that we are entering a method definition.
PushDeclContext(FnBodyScope, MDecl);
PushFunctionScope();
// Create Decl objects for each parameter, entrring them in the scope for
// binding to their use.
// Insert the invisible arguments, self and _cmd!
MDecl->createImplicitParams(Context, MDecl->getClassInterface());
PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope);
PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope);
// The ObjC parser requires parameter names so there's no need to check.
CheckParmsForFunctionDef(MDecl->parameters(),
/*CheckParameterNames=*/false);
// Introduce all of the other parameters into this scope.
for (auto *Param : MDecl->parameters()) {
if (!Param->isInvalidDecl() &&
getLangOpts().ObjCAutoRefCount &&
!HasExplicitOwnershipAttr(*this, Param))
Diag(Param->getLocation(), diag::warn_arc_strong_pointer_objc_pointer) <<
Param->getType();
if (Param->getIdentifier())
PushOnScopeChains(Param, FnBodyScope);
}
// In ARC, disallow definition of retain/release/autorelease/retainCount
if (getLangOpts().ObjCAutoRefCount) {
switch (MDecl->getMethodFamily()) {
case OMF_retain:
case OMF_retainCount:
case OMF_release:
case OMF_autorelease:
Diag(MDecl->getLocation(), diag::err_arc_illegal_method_def)
<< 0 << MDecl->getSelector();
break;
case OMF_None:
case OMF_dealloc:
case OMF_finalize:
case OMF_alloc:
case OMF_init:
case OMF_mutableCopy:
case OMF_copy:
case OMF_new:
case OMF_self:
case OMF_initialize:
case OMF_performSelector:
break;
}
}
// Warn on deprecated methods under -Wdeprecated-implementations,
// and prepare for warning on missing super calls.
if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) {
ObjCMethodDecl *IMD =
IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod());
if (IMD) {
ObjCImplDecl *ImplDeclOfMethodDef =
dyn_cast<ObjCImplDecl>(MDecl->getDeclContext());
ObjCContainerDecl *ContDeclOfMethodDecl =
dyn_cast<ObjCContainerDecl>(IMD->getDeclContext());
ObjCImplDecl *ImplDeclOfMethodDecl = nullptr;
if (ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(ContDeclOfMethodDecl))
ImplDeclOfMethodDecl = OID->getImplementation();
else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(ContDeclOfMethodDecl)) {
if (CD->IsClassExtension()) {
if (ObjCInterfaceDecl *OID = CD->getClassInterface())
ImplDeclOfMethodDecl = OID->getImplementation();
} else
ImplDeclOfMethodDecl = CD->getImplementation();
}
// No need to issue deprecated warning if deprecated mehod in class/category
// is being implemented in its own implementation (no overriding is involved).
if (!ImplDeclOfMethodDecl || ImplDeclOfMethodDecl != ImplDeclOfMethodDef)
DiagnoseObjCImplementedDeprecations(*this, IMD, MDecl->getLocation());
}
if (MDecl->getMethodFamily() == OMF_init) {
if (MDecl->isDesignatedInitializerForTheInterface()) {
getCurFunction()->ObjCIsDesignatedInit = true;
getCurFunction()->ObjCWarnForNoDesignatedInitChain =
IC->getSuperClass() != nullptr;
} else if (IC->hasDesignatedInitializers()) {
getCurFunction()->ObjCIsSecondaryInit = true;
getCurFunction()->ObjCWarnForNoInitDelegation = true;
}
}
// If this is "dealloc" or "finalize", set some bit here.
// Then in ActOnSuperMessage() (SemaExprObjC), set it back to false.
// Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set.
// Only do this if the current class actually has a superclass.
if (const ObjCInterfaceDecl *SuperClass = IC->getSuperClass()) {
ObjCMethodFamily Family = MDecl->getMethodFamily();
if (Family == OMF_dealloc) {
if (!(getLangOpts().ObjCAutoRefCount ||
getLangOpts().getGC() == LangOptions::GCOnly))
getCurFunction()->ObjCShouldCallSuper = true;
} else if (Family == OMF_finalize) {
if (Context.getLangOpts().getGC() != LangOptions::NonGC)
getCurFunction()->ObjCShouldCallSuper = true;
} else {
const ObjCMethodDecl *SuperMethod =
SuperClass->lookupMethod(MDecl->getSelector(),
MDecl->isInstanceMethod());
getCurFunction()->ObjCShouldCallSuper =
(SuperMethod && SuperMethod->hasAttr<ObjCRequiresSuperAttr>());
}
}
}
}
namespace {
// Callback to only accept typo corrections that are Objective-C classes.
// If an ObjCInterfaceDecl* is given to the constructor, then the validation
// function will reject corrections to that class.
class ObjCInterfaceValidatorCCC : public CorrectionCandidateCallback {
public:
ObjCInterfaceValidatorCCC() : CurrentIDecl(nullptr) {}
explicit ObjCInterfaceValidatorCCC(ObjCInterfaceDecl *IDecl)
: CurrentIDecl(IDecl) {}
bool ValidateCandidate(const TypoCorrection &candidate) override {
ObjCInterfaceDecl *ID = candidate.getCorrectionDeclAs<ObjCInterfaceDecl>();
return ID && !declaresSameEntity(ID, CurrentIDecl);
}
private:
ObjCInterfaceDecl *CurrentIDecl;
};
} // end anonymous namespace
static void diagnoseUseOfProtocols(Sema &TheSema,
ObjCContainerDecl *CD,
ObjCProtocolDecl *const *ProtoRefs,
unsigned NumProtoRefs,
const SourceLocation *ProtoLocs) {
assert(ProtoRefs);
// Diagnose availability in the context of the ObjC container.
Sema::ContextRAII SavedContext(TheSema, CD);
for (unsigned i = 0; i < NumProtoRefs; ++i) {
(void)TheSema.DiagnoseUseOfDecl(ProtoRefs[i], ProtoLocs[i],
/*UnknownObjCClass=*/nullptr,
/*ObjCPropertyAccess=*/false,
/*AvoidPartialAvailabilityChecks=*/true);
}
}
void Sema::
ActOnSuperClassOfClassInterface(Scope *S,
SourceLocation AtInterfaceLoc,
ObjCInterfaceDecl *IDecl,
IdentifierInfo *ClassName,
SourceLocation ClassLoc,
IdentifierInfo *SuperName,
SourceLocation SuperLoc,
ArrayRef<ParsedType> SuperTypeArgs,
SourceRange SuperTypeArgsRange) {
// Check if a different kind of symbol declared in this scope.
NamedDecl *PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc,
LookupOrdinaryName);
if (!PrevDecl) {
// Try to correct for a typo in the superclass name without correcting
// to the class we're defining.
if (TypoCorrection Corrected = CorrectTypo(
DeclarationNameInfo(SuperName, SuperLoc),
LookupOrdinaryName, TUScope,
nullptr, llvm::make_unique<ObjCInterfaceValidatorCCC>(IDecl),
CTK_ErrorRecovery)) {
diagnoseTypo(Corrected, PDiag(diag::err_undef_superclass_suggest)
<< SuperName << ClassName);
PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
}
}
if (declaresSameEntity(PrevDecl, IDecl)) {
Diag(SuperLoc, diag::err_recursive_superclass)
<< SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
IDecl->setEndOfDefinitionLoc(ClassLoc);
} else {
ObjCInterfaceDecl *SuperClassDecl =
dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
QualType SuperClassType;
// Diagnose classes that inherit from deprecated classes.
if (SuperClassDecl) {
(void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc);
SuperClassType = Context.getObjCInterfaceType(SuperClassDecl);
}
if (PrevDecl && !SuperClassDecl) {
// The previous declaration was not a class decl. Check if we have a
// typedef. If we do, get the underlying class type.
if (const TypedefNameDecl *TDecl =
dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
QualType T = TDecl->getUnderlyingType();
if (T->isObjCObjectType()) {
if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) {
SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl);
SuperClassType = Context.getTypeDeclType(TDecl);
// This handles the following case:
// @interface NewI @end
// typedef NewI DeprI __attribute__((deprecated("blah")))
// @interface SI : DeprI /* warn here */ @end
(void)DiagnoseUseOfDecl(const_cast<TypedefNameDecl*>(TDecl), SuperLoc);
}
}
}
// This handles the following case:
//
// typedef int SuperClass;
// @interface MyClass : SuperClass {} @end
//
if (!SuperClassDecl) {
Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
}
}
if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
if (!SuperClassDecl)
Diag(SuperLoc, diag::err_undef_superclass)
<< SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
else if (RequireCompleteType(SuperLoc,
SuperClassType,
diag::err_forward_superclass,
SuperClassDecl->getDeclName(),
ClassName,
SourceRange(AtInterfaceLoc, ClassLoc))) {
SuperClassDecl = nullptr;
SuperClassType = QualType();
}
}
if (SuperClassType.isNull()) {
assert(!SuperClassDecl && "Failed to set SuperClassType?");
return;
}
// Handle type arguments on the superclass.
TypeSourceInfo *SuperClassTInfo = nullptr;
if (!SuperTypeArgs.empty()) {
TypeResult fullSuperClassType = actOnObjCTypeArgsAndProtocolQualifiers(
S,
SuperLoc,
CreateParsedType(SuperClassType,
nullptr),
SuperTypeArgsRange.getBegin(),
SuperTypeArgs,
SuperTypeArgsRange.getEnd(),
SourceLocation(),
{ },
{ },
SourceLocation());
if (!fullSuperClassType.isUsable())
return;
SuperClassType = GetTypeFromParser(fullSuperClassType.get(),
&SuperClassTInfo);
}
if (!SuperClassTInfo) {
SuperClassTInfo = Context.getTrivialTypeSourceInfo(SuperClassType,
SuperLoc);
}
IDecl->setSuperClass(SuperClassTInfo);
IDecl->setEndOfDefinitionLoc(SuperClassTInfo->getTypeLoc().getLocEnd());
}
}
DeclResult Sema::actOnObjCTypeParam(Scope *S,
ObjCTypeParamVariance variance,
SourceLocation varianceLoc,
unsigned index,
IdentifierInfo *paramName,
SourceLocation paramLoc,
SourceLocation colonLoc,
ParsedType parsedTypeBound) {
// If there was an explicitly-provided type bound, check it.
TypeSourceInfo *typeBoundInfo = nullptr;
if (parsedTypeBound) {
// The type bound can be any Objective-C pointer type.
QualType typeBound = GetTypeFromParser(parsedTypeBound, &typeBoundInfo);
if (typeBound->isObjCObjectPointerType()) {
// okay
} else if (typeBound->isObjCObjectType()) {
// The user forgot the * on an Objective-C pointer type, e.g.,
// "T : NSView".
SourceLocation starLoc = getLocForEndOfToken(
typeBoundInfo->getTypeLoc().getEndLoc());
Diag(typeBoundInfo->getTypeLoc().getBeginLoc(),
diag::err_objc_type_param_bound_missing_pointer)
<< typeBound << paramName
<< FixItHint::CreateInsertion(starLoc, " *");
// Create a new type location builder so we can update the type
// location information we have.
TypeLocBuilder builder;
builder.pushFullCopy(typeBoundInfo->getTypeLoc());
// Create the Objective-C pointer type.
typeBound = Context.getObjCObjectPointerType(typeBound);
ObjCObjectPointerTypeLoc newT
= builder.push<ObjCObjectPointerTypeLoc>(typeBound);
newT.setStarLoc(starLoc);
// Form the new type source information.
typeBoundInfo = builder.getTypeSourceInfo(Context, typeBound);
} else {
// Not a valid type bound.
Diag(typeBoundInfo->getTypeLoc().getBeginLoc(),
diag::err_objc_type_param_bound_nonobject)
<< typeBound << paramName;
// Forget the bound; we'll default to id later.
typeBoundInfo = nullptr;
}
// Type bounds cannot have qualifiers (even indirectly) or explicit
// nullability.
if (typeBoundInfo) {
QualType typeBound = typeBoundInfo->getType();
TypeLoc qual = typeBoundInfo->getTypeLoc().findExplicitQualifierLoc();
if (qual || typeBound.hasQualifiers()) {
bool diagnosed = false;
SourceRange rangeToRemove;
if (qual) {
if (auto attr = qual.getAs<AttributedTypeLoc>()) {
rangeToRemove = attr.getLocalSourceRange();
if (attr.getTypePtr()->getImmediateNullability()) {
Diag(attr.getLocStart(),
diag::err_objc_type_param_bound_explicit_nullability)
<< paramName << typeBound
<< FixItHint::CreateRemoval(rangeToRemove);
diagnosed = true;
}
}
}
if (!diagnosed) {
Diag(qual ? qual.getLocStart()
: typeBoundInfo->getTypeLoc().getLocStart(),
diag::err_objc_type_param_bound_qualified)
<< paramName << typeBound << typeBound.getQualifiers().getAsString()
<< FixItHint::CreateRemoval(rangeToRemove);
}
// If the type bound has qualifiers other than CVR, we need to strip
// them or we'll probably assert later when trying to apply new
// qualifiers.
Qualifiers quals = typeBound.getQualifiers();
quals.removeCVRQualifiers();
if (!quals.empty()) {
typeBoundInfo =
Context.getTrivialTypeSourceInfo(typeBound.getUnqualifiedType());
}
}
}
}
// If there was no explicit type bound (or we removed it due to an error),
// use 'id' instead.
if (!typeBoundInfo) {
colonLoc = SourceLocation();
typeBoundInfo = Context.getTrivialTypeSourceInfo(Context.getObjCIdType());
}
// Create the type parameter.
return ObjCTypeParamDecl::Create(Context, CurContext, variance, varianceLoc,
index, paramLoc, paramName, colonLoc,
typeBoundInfo);
}
ObjCTypeParamList *Sema::actOnObjCTypeParamList(Scope *S,
SourceLocation lAngleLoc,
ArrayRef<Decl *> typeParamsIn,
SourceLocation rAngleLoc) {
// We know that the array only contains Objective-C type parameters.
ArrayRef<ObjCTypeParamDecl *>
typeParams(
reinterpret_cast<ObjCTypeParamDecl * const *>(typeParamsIn.data()),
typeParamsIn.size());
// Diagnose redeclarations of type parameters.
// We do this now because Objective-C type parameters aren't pushed into
// scope until later (after the instance variable block), but we want the
// diagnostics to occur right after we parse the type parameter list.
llvm::SmallDenseMap<IdentifierInfo *, ObjCTypeParamDecl *> knownParams;
for (auto typeParam : typeParams) {
auto known = knownParams.find(typeParam->getIdentifier());
if (known != knownParams.end()) {
Diag(typeParam->getLocation(), diag::err_objc_type_param_redecl)
<< typeParam->getIdentifier()
<< SourceRange(known->second->getLocation());
typeParam->setInvalidDecl();
} else {
knownParams.insert(std::make_pair(typeParam->getIdentifier(), typeParam));
// Push the type parameter into scope.
PushOnScopeChains(typeParam, S, /*AddToContext=*/false);
}
}
// Create the parameter list.
return ObjCTypeParamList::create(Context, lAngleLoc, typeParams, rAngleLoc);
}
void Sema::popObjCTypeParamList(Scope *S, ObjCTypeParamList *typeParamList) {
for (auto typeParam : *typeParamList) {
if (!typeParam->isInvalidDecl()) {
S->RemoveDecl(typeParam);
IdResolver.RemoveDecl(typeParam);
}
}
}
namespace {
/// The context in which an Objective-C type parameter list occurs, for use
/// in diagnostics.
enum class TypeParamListContext {
ForwardDeclaration,
Definition,
Category,
Extension
};
} // end anonymous namespace
/// Check consistency between two Objective-C type parameter lists, e.g.,
/// between a category/extension and an \@interface or between an \@class and an
/// \@interface.
static bool checkTypeParamListConsistency(Sema &S,
ObjCTypeParamList *prevTypeParams,
ObjCTypeParamList *newTypeParams,
TypeParamListContext newContext) {
// If the sizes don't match, complain about that.
if (prevTypeParams->size() != newTypeParams->size()) {
SourceLocation diagLoc;
if (newTypeParams->size() > prevTypeParams->size()) {
diagLoc = newTypeParams->begin()[prevTypeParams->size()]->getLocation();
} else {
diagLoc = S.getLocForEndOfToken(newTypeParams->back()->getLocEnd());
}
S.Diag(diagLoc, diag::err_objc_type_param_arity_mismatch)
<< static_cast<unsigned>(newContext)
<< (newTypeParams->size() > prevTypeParams->size())
<< prevTypeParams->size()
<< newTypeParams->size();
return true;
}
// Match up the type parameters.
for (unsigned i = 0, n = prevTypeParams->size(); i != n; ++i) {
ObjCTypeParamDecl *prevTypeParam = prevTypeParams->begin()[i];
ObjCTypeParamDecl *newTypeParam = newTypeParams->begin()[i];
// Check for consistency of the variance.
if (newTypeParam->getVariance() != prevTypeParam->getVariance()) {
if (newTypeParam->getVariance() == ObjCTypeParamVariance::Invariant &&
newContext != TypeParamListContext::Definition) {
// When the new type parameter is invariant and is not part
// of the definition, just propagate the variance.
newTypeParam->setVariance(prevTypeParam->getVariance());
} else if (prevTypeParam->getVariance()
== ObjCTypeParamVariance::Invariant &&
!(isa<ObjCInterfaceDecl>(prevTypeParam->getDeclContext()) &&
cast<ObjCInterfaceDecl>(prevTypeParam->getDeclContext())
->getDefinition() == prevTypeParam->getDeclContext())) {
// When the old parameter is invariant and was not part of the
// definition, just ignore the difference because it doesn't
// matter.
} else {
{
// Diagnose the conflict and update the second declaration.
SourceLocation diagLoc = newTypeParam->getVarianceLoc();
if (diagLoc.isInvalid())
diagLoc = newTypeParam->getLocStart();
auto diag = S.Diag(diagLoc,
diag::err_objc_type_param_variance_conflict)
<< static_cast<unsigned>(newTypeParam->getVariance())
<< newTypeParam->getDeclName()
<< static_cast<unsigned>(prevTypeParam->getVariance())
<< prevTypeParam->getDeclName();
switch (prevTypeParam->getVariance()) {
case ObjCTypeParamVariance::Invariant:
diag << FixItHint::CreateRemoval(newTypeParam->getVarianceLoc());
break;
case ObjCTypeParamVariance::Covariant:
case ObjCTypeParamVariance::Contravariant: {
StringRef newVarianceStr
= prevTypeParam->getVariance() == ObjCTypeParamVariance::Covariant
? "__covariant"
: "__contravariant";
if (newTypeParam->getVariance()
== ObjCTypeParamVariance::Invariant) {
diag << FixItHint::CreateInsertion(newTypeParam->getLocStart(),
(newVarianceStr + " ").str());
} else {
diag << FixItHint::CreateReplacement(newTypeParam->getVarianceLoc(),
newVarianceStr);
}
}
}
}
S.Diag(prevTypeParam->getLocation(), diag::note_objc_type_param_here)
<< prevTypeParam->getDeclName();
// Override the variance.
newTypeParam->setVariance(prevTypeParam->getVariance());
}
}
// If the bound types match, there's nothing to do.
if (S.Context.hasSameType(prevTypeParam->getUnderlyingType(),
newTypeParam->getUnderlyingType()))
continue;
// If the new type parameter's bound was explicit, complain about it being
// different from the original.
if (newTypeParam->hasExplicitBound()) {
SourceRange newBoundRange = newTypeParam->getTypeSourceInfo()
->getTypeLoc().getSourceRange();
S.Diag(newBoundRange.getBegin(), diag::err_objc_type_param_bound_conflict)
<< newTypeParam->getUnderlyingType()
<< newTypeParam->getDeclName()
<< prevTypeParam->hasExplicitBound()
<< prevTypeParam->getUnderlyingType()
<< (newTypeParam->getDeclName() == prevTypeParam->getDeclName())
<< prevTypeParam->getDeclName()
<< FixItHint::CreateReplacement(
newBoundRange,
prevTypeParam->getUnderlyingType().getAsString(
S.Context.getPrintingPolicy()));
S.Diag(prevTypeParam->getLocation(), diag::note_objc_type_param_here)
<< prevTypeParam->getDeclName();
// Override the new type parameter's bound type with the previous type,
// so that it's consistent.
newTypeParam->setTypeSourceInfo(
S.Context.getTrivialTypeSourceInfo(prevTypeParam->getUnderlyingType()));
continue;
}
// The new type parameter got the implicit bound of 'id'. That's okay for
// categories and extensions (overwrite it later), but not for forward
// declarations and @interfaces, because those must be standalone.
if (newContext == TypeParamListContext::ForwardDeclaration ||
newContext == TypeParamListContext::Definition) {
// Diagnose this problem for forward declarations and definitions.
SourceLocation insertionLoc
= S.getLocForEndOfToken(newTypeParam->getLocation());
std::string newCode
= " : " + prevTypeParam->getUnderlyingType().getAsString(
S.Context.getPrintingPolicy());
S.Diag(newTypeParam->getLocation(),
diag::err_objc_type_param_bound_missing)
<< prevTypeParam->getUnderlyingType()
<< newTypeParam->getDeclName()
<< (newContext == TypeParamListContext::ForwardDeclaration)
<< FixItHint::CreateInsertion(insertionLoc, newCode);
S.Diag(prevTypeParam->getLocation(), diag::note_objc_type_param_here)
<< prevTypeParam->getDeclName();
}
// Update the new type parameter's bound to match the previous one.
newTypeParam->setTypeSourceInfo(
S.Context.getTrivialTypeSourceInfo(prevTypeParam->getUnderlyingType()));
}
return false;
}
Decl *Sema::
ActOnStartClassInterface(Scope *S, SourceLocation AtInterfaceLoc,
IdentifierInfo *ClassName, SourceLocation ClassLoc,
ObjCTypeParamList *typeParamList,
IdentifierInfo *SuperName, SourceLocation SuperLoc,
ArrayRef<ParsedType> SuperTypeArgs,
SourceRange SuperTypeArgsRange,
Decl * const *ProtoRefs, unsigned NumProtoRefs,
const SourceLocation *ProtoLocs,
SourceLocation EndProtoLoc, AttributeList *AttrList) {
assert(ClassName && "Missing class identifier");
// Check for another declaration kind with the same name.
NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc,
LookupOrdinaryName, ForRedeclaration);
if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
}
// Create a declaration to describe this @interface.
ObjCInterfaceDecl* PrevIDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
if (PrevIDecl && PrevIDecl->getIdentifier() != ClassName) {
// A previous decl with a different name is because of
// @compatibility_alias, for example:
// \code
// @class NewImage;
// @compatibility_alias OldImage NewImage;
// \endcode
// A lookup for 'OldImage' will return the 'NewImage' decl.
//
// In such a case use the real declaration name, instead of the alias one,
// otherwise we will break IdentifierResolver and redecls-chain invariants.
// FIXME: If necessary, add a bit to indicate that this ObjCInterfaceDecl
// has been aliased.
ClassName = PrevIDecl->getIdentifier();
}
// If there was a forward declaration with type parameters, check
// for consistency.
if (PrevIDecl) {
if (ObjCTypeParamList *prevTypeParamList = PrevIDecl->getTypeParamList()) {
if (typeParamList) {
// Both have type parameter lists; check for consistency.
if (checkTypeParamListConsistency(*this, prevTypeParamList,
typeParamList,
TypeParamListContext::Definition)) {
typeParamList = nullptr;
}
} else {
Diag(ClassLoc, diag::err_objc_parameterized_forward_class_first)
<< ClassName;
Diag(prevTypeParamList->getLAngleLoc(), diag::note_previous_decl)
<< ClassName;
// Clone the type parameter list.
SmallVector<ObjCTypeParamDecl *, 4> clonedTypeParams;
for (auto typeParam : *prevTypeParamList) {
clonedTypeParams.push_back(
ObjCTypeParamDecl::Create(
Context,
CurContext,
typeParam->getVariance(),
SourceLocation(),
typeParam->getIndex(),
SourceLocation(),
typeParam->getIdentifier(),
SourceLocation(),
Context.getTrivialTypeSourceInfo(typeParam->getUnderlyingType())));
}
typeParamList = ObjCTypeParamList::create(Context,
SourceLocation(),
clonedTypeParams,
SourceLocation());
}