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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 "clang/Sema/SemaInternal.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/ExternalSemaSource.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/ScopeInfo.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Lex/Preprocessor.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->getResultType()
->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 = 0;
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(new (Context) UnavailableAttr(loc, Context,
"init method returns a type unrelated to its receiver type"));
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,
bool IsImplementation) {
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->getResultType();
SourceRange ResultTypeRange;
if (const TypeSourceInfo *ResultTypeInfo
= NewMethod->getResultTypeSourceInfo())
ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange();
// 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_overridden_family)
<< 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();
for (ObjCMethodDecl::param_iterator
ni = NewMethod->param_begin(), ne = NewMethod->param_end();
ni != ne; ++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.
static bool CheckARCMethodDecl(Sema &S, ObjCMethodDecl *method) {
ObjCMethodFamily family = method->getMethodFamily();
switch (family) {
case OMF_None:
case OMF_dealloc:
case OMF_finalize:
case OMF_retain:
case OMF_release:
case OMF_autorelease:
case OMF_retainCount:
case OMF_self:
case OMF_performSelector:
return false;
case OMF_init:
// If the method doesn't obey the init rules, don't bother annotating it.
if (S.checkInitMethod(method, QualType()))
return true;
method->addAttr(new (S.Context) NSConsumesSelfAttr(SourceLocation(),
S.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(new (S.Context) NSReturnsRetainedAttr(SourceLocation(),
S.Context));
return false;
}
static void DiagnoseObjCImplementedDeprecations(Sema &S,
NamedDecl *ND,
SourceLocation ImplLoc,
int select) {
if (ND && ND->isDeprecated()) {
S.Diag(ImplLoc, diag::warn_deprecated_def) << select;
if (select == 0)
S.Diag(ND->getLocation(), diag::note_method_declared_at)
<< ND->getDeclName();
else
S.Diag(ND->getLocation(), diag::note_previous_decl) << "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);
}
/// 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() == 0 && "Method parsing 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);
// Introduce all of the other parameters into this scope.
for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(),
E = MDecl->param_end(); PI != E; ++PI) {
ParmVarDecl *Param = (*PI);
if (!Param->isInvalidDecl() &&
RequireCompleteType(Param->getLocation(), Param->getType(),
diag::err_typecheck_decl_incomplete_type))
Param->setInvalidDecl();
if ((*PI)->getIdentifier())
PushOnScopeChains(*PI, 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)
<< 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_performSelector:
break;
}
}
// Warn on deprecated methods under -Wdeprecated-implementations,
// and prepare for warning on missing super calls.
if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) {
if (ObjCMethodDecl *IMD =
IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod()))
DiagnoseObjCImplementedDeprecations(*this,
dyn_cast<NamedDecl>(IMD),
MDecl->getLocation(), 0);
// 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 (IC->getSuperClass()) {
ObjCShouldCallSuperDealloc =
!(Context.getLangOpts().ObjCAutoRefCount ||
Context.getLangOpts().getGC() == LangOptions::GCOnly) &&
MDecl->getMethodFamily() == OMF_dealloc;
ObjCShouldCallSuperFinalize =
Context.getLangOpts().getGC() != LangOptions::NonGC &&
MDecl->getMethodFamily() == OMF_finalize;
}
}
}
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(0) {}
explicit ObjCInterfaceValidatorCCC(ObjCInterfaceDecl *IDecl)
: CurrentIDecl(IDecl) {}
virtual bool ValidateCandidate(const TypoCorrection &candidate) {
ObjCInterfaceDecl *ID = candidate.getCorrectionDeclAs<ObjCInterfaceDecl>();
return ID && !declaresSameEntity(ID, CurrentIDecl);
}
private:
ObjCInterfaceDecl *CurrentIDecl;
};
}
Decl *Sema::
ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
IdentifierInfo *ClassName, SourceLocation ClassLoc,
IdentifierInfo *SuperName, SourceLocation SuperLoc,
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);
ObjCInterfaceDecl *IDecl
= ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, ClassName,
PrevIDecl, ClassLoc);
if (PrevIDecl) {
// Class already seen. Was it a definition?
if (ObjCInterfaceDecl *Def = PrevIDecl->getDefinition()) {
Diag(AtInterfaceLoc, diag::err_duplicate_class_def)
<< PrevIDecl->getDeclName();
Diag(Def->getLocation(), diag::note_previous_definition);
IDecl->setInvalidDecl();
}
}
if (AttrList)
ProcessDeclAttributeList(TUScope, IDecl, AttrList);
PushOnScopeChains(IDecl, TUScope);
// Start the definition of this class. If we're in a redefinition case, there
// may already be a definition, so we'll end up adding to it.
if (!IDecl->hasDefinition())
IDecl->startDefinition();
if (SuperName) {
// Check if a different kind of symbol declared in this scope.
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.
ObjCInterfaceValidatorCCC Validator(IDecl);
if (TypoCorrection Corrected = CorrectTypo(
DeclarationNameInfo(SuperName, SuperLoc), LookupOrdinaryName, TUScope,
NULL, Validator)) {
PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
Diag(SuperLoc, diag::err_undef_superclass_suggest)
<< SuperName << ClassName << PrevDecl->getDeclName();
Diag(PrevDecl->getLocation(), diag::note_previous_decl)
<< PrevDecl->getDeclName();
}
}
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);
// Diagnose classes that inherit from deprecated classes.
if (SuperClassDecl)
(void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc);
if (PrevDecl && SuperClassDecl == 0) {
// 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);
}
}
// 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,
Context.getObjCInterfaceType(SuperClassDecl),
PDiag(diag::err_forward_superclass)
<< SuperClassDecl->getDeclName()
<< ClassName
<< SourceRange(AtInterfaceLoc, ClassLoc))) {
SuperClassDecl = 0;
}
}
IDecl->setSuperClass(SuperClassDecl);
IDecl->setSuperClassLoc(SuperLoc);
IDecl->setEndOfDefinitionLoc(SuperLoc);
}
} else { // we have a root class.
IDecl->setEndOfDefinitionLoc(ClassLoc);
}
// Check then save referenced protocols.
if (NumProtoRefs) {
IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
ProtoLocs, Context);
IDecl->setEndOfDefinitionLoc(EndProtoLoc);
}
CheckObjCDeclScope(IDecl);
return ActOnObjCContainerStartDefinition(IDecl);
}
/// ActOnCompatiblityAlias - this action is called after complete parsing of
/// @compatibility_alias declaration. It sets up the alias relationships.
Decl *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc,
IdentifierInfo *AliasName,
SourceLocation AliasLocation,
IdentifierInfo *ClassName,
SourceLocation ClassLocation) {
// Look for previous declaration of alias name
NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation,
LookupOrdinaryName, ForRedeclaration);
if (ADecl) {
if (isa<ObjCCompatibleAliasDecl>(ADecl))
Diag(AliasLocation, diag::warn_previous_alias_decl);
else
Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName;
Diag(ADecl->getLocation(), diag::note_previous_declaration);
return 0;
}
// Check for class declaration
NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
LookupOrdinaryName, ForRedeclaration);
if (const TypedefNameDecl *TDecl =
dyn_cast_or_null<TypedefNameDecl>(CDeclU)) {
QualType T = TDecl->getUnderlyingType();
if (T->isObjCObjectType()) {
if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) {
ClassName = IDecl->getIdentifier();
CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
LookupOrdinaryName, ForRedeclaration);
}
}
}
ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU);
if (CDecl == 0) {
Diag(ClassLocation, diag::warn_undef_interface) << ClassName;
if (CDeclU)
Diag(CDeclU->getLocation(), diag::note_previous_declaration);
return 0;
}
// Everything checked out, instantiate a new alias declaration AST.
ObjCCompatibleAliasDecl *AliasDecl =
ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl);
if (!CheckObjCDeclScope(AliasDecl))
PushOnScopeChains(AliasDecl, TUScope);
return AliasDecl;
}
bool Sema::CheckForwardProtocolDeclarationForCircularDependency(
IdentifierInfo *PName,
SourceLocation &Ploc, SourceLocation PrevLoc,
const ObjCList<ObjCProtocolDecl> &PList) {
bool res = false;
for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(),
E = PList.end(); I != E; ++I) {
if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(),
Ploc)) {
if (PDecl->getIdentifier() == PName) {
Diag(Ploc, diag::err_protocol_has_circular_dependency);
Diag(PrevLoc, diag::note_previous_definition);
res = true;
}
if (!PDecl->hasDefinition())
continue;
if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc,
PDecl->getLocation(), PDecl->getReferencedProtocols()))
res = true;
}
}
return res;
}
Decl *
Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc,
IdentifierInfo *ProtocolName,
SourceLocation ProtocolLoc,
Decl * const *ProtoRefs,
unsigned NumProtoRefs,
const SourceLocation *ProtoLocs,
SourceLocation EndProtoLoc,
AttributeList *AttrList) {
bool err = false;
// FIXME: Deal with AttrList.
assert(ProtocolName && "Missing protocol identifier");
ObjCProtocolDecl *PrevDecl = LookupProtocol(ProtocolName, ProtocolLoc,
ForRedeclaration);
ObjCProtocolDecl *PDecl = 0;
if (ObjCProtocolDecl *Def = PrevDecl? PrevDecl->getDefinition() : 0) {
// If we already have a definition, complain.
Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName;
Diag(Def->getLocation(), diag::note_previous_definition);
// Create a new protocol that is completely distinct from previous
// declarations, and do not make this protocol available for name lookup.
// That way, we'll end up completely ignoring the duplicate.
// FIXME: Can we turn this into an error?
PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName,
ProtocolLoc, AtProtoInterfaceLoc,
/*PrevDecl=*/0);
PDecl->startDefinition();
} else {
if (PrevDecl) {
// Check for circular dependencies among protocol declarations. This can
// only happen if this protocol was forward-declared.
ObjCList<ObjCProtocolDecl> PList;
PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context);
err = CheckForwardProtocolDeclarationForCircularDependency(
ProtocolName, ProtocolLoc, PrevDecl->getLocation(), PList);
}
// Create the new declaration.
PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName,
ProtocolLoc, AtProtoInterfaceLoc,
/*PrevDecl=*/PrevDecl);
PushOnScopeChains(PDecl, TUScope);
PDecl->startDefinition();
}
if (AttrList)
ProcessDeclAttributeList(TUScope, PDecl, AttrList);
// Merge attributes from previous declarations.
if (PrevDecl)
mergeDeclAttributes(PDecl, PrevDecl);
if (!err && NumProtoRefs ) {
/// Check then save referenced protocols.
PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
ProtoLocs, Context);
}
CheckObjCDeclScope(PDecl);
return ActOnObjCContainerStartDefinition(PDecl);
}
/// FindProtocolDeclaration - This routine looks up protocols and
/// issues an error if they are not declared. It returns list of
/// protocol declarations in its 'Protocols' argument.
void
Sema::FindProtocolDeclaration(bool WarnOnDeclarations,
const IdentifierLocPair *ProtocolId,
unsigned NumProtocols,
SmallVectorImpl<Decl *> &Protocols) {
for (unsigned i = 0; i != NumProtocols; ++i) {
ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first,
ProtocolId[i].second);
if (!PDecl) {
DeclFilterCCC<ObjCProtocolDecl> Validator;
TypoCorrection Corrected = CorrectTypo(
DeclarationNameInfo(ProtocolId[i].first, ProtocolId[i].second),
LookupObjCProtocolName, TUScope, NULL, Validator);
if ((PDecl = Corrected.getCorrectionDeclAs<ObjCProtocolDecl>())) {
Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest)
<< ProtocolId[i].first << Corrected.getCorrection();
Diag(PDecl->getLocation(), diag::note_previous_decl)
<< PDecl->getDeclName();
}
}
if (!PDecl) {
Diag(ProtocolId[i].second, diag::err_undeclared_protocol)
<< ProtocolId[i].first;
continue;
}
(void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second);
// If this is a forward declaration and we are supposed to warn in this
// case, do it.
if (WarnOnDeclarations && !PDecl->hasDefinition())
Diag(ProtocolId[i].second, diag::warn_undef_protocolref)
<< ProtocolId[i].first;
Protocols.push_back(PDecl);
}
}
/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of
/// a class method in its extension.
///
void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
ObjCInterfaceDecl *ID) {
if (!ID)
return; // Possibly due to previous error
llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap;
for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(),
e = ID->meth_end(); i != e; ++i) {
ObjCMethodDecl *MD = &*i;
MethodMap[MD->getSelector()] = MD;
}
if (MethodMap.empty())
return;
for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(),
e = CAT->meth_end(); i != e; ++i) {
ObjCMethodDecl *Method = &*i;
const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()];
if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) {
Diag(Method->getLocation(), diag::err_duplicate_method_decl)
<< Method->getDeclName();
Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
}
}
}
/// ActOnForwardProtocolDeclaration - Handle @protocol foo;
Sema::DeclGroupPtrTy
Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc,
const IdentifierLocPair *IdentList,
unsigned NumElts,
AttributeList *attrList) {
SmallVector<Decl *, 8> DeclsInGroup;
for (unsigned i = 0; i != NumElts; ++i) {
IdentifierInfo *Ident = IdentList[i].first;
ObjCProtocolDecl *PrevDecl = LookupProtocol(Ident, IdentList[i].second,
ForRedeclaration);
ObjCProtocolDecl *PDecl
= ObjCProtocolDecl::Create(Context, CurContext, Ident,
IdentList[i].second, AtProtocolLoc,
PrevDecl);
PushOnScopeChains(PDecl, TUScope);
CheckObjCDeclScope(PDecl);
if (attrList)
ProcessDeclAttributeList(TUScope, PDecl, attrList);
if (PrevDecl)
mergeDeclAttributes(PDecl, PrevDecl);
DeclsInGroup.push_back(PDecl);
}
return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
}
Decl *Sema::
ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
IdentifierInfo *ClassName, SourceLocation ClassLoc,
IdentifierInfo *CategoryName,
SourceLocation CategoryLoc,
Decl * const *ProtoRefs,
unsigned NumProtoRefs,
const SourceLocation *ProtoLocs,
SourceLocation EndProtoLoc) {
ObjCCategoryDecl *CDecl;
ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
/// Check that class of this category is already completely declared.
if (!IDecl
|| RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
PDiag(diag::err_category_forward_interface)
<< (CategoryName == 0))) {
// Create an invalid ObjCCategoryDecl to serve as context for
// the enclosing method declarations. We mark the decl invalid
// to make it clear that this isn't a valid AST.
CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
ClassLoc, CategoryLoc, CategoryName,IDecl);
CDecl->setInvalidDecl();
CurContext->addDecl(CDecl);
if (!IDecl)
Diag(ClassLoc, diag::err_undef_interface) << ClassName;
return ActOnObjCContainerStartDefinition(CDecl);
}
if (!CategoryName && IDecl->getImplementation()) {
Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName;
Diag(IDecl->getImplementation()->getLocation(),
diag::note_implementation_declared);
}
if (CategoryName) {
/// Check for duplicate interface declaration for this category
ObjCCategoryDecl *CDeclChain;
for (CDeclChain = IDecl->getCategoryList(); CDeclChain;
CDeclChain = CDeclChain->getNextClassCategory()) {
if (CDeclChain->getIdentifier() == CategoryName) {
// Class extensions can be declared multiple times.
Diag(CategoryLoc, diag::warn_dup_category_def)
<< ClassName << CategoryName;
Diag(CDeclChain->getLocation(), diag::note_previous_definition);
break;
}
}
}
CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
ClassLoc, CategoryLoc, CategoryName, IDecl);
// FIXME: PushOnScopeChains?
CurContext->addDecl(CDecl);
if (NumProtoRefs) {
CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
ProtoLocs, Context);
// Protocols in the class extension belong to the class.
if (CDecl->IsClassExtension())
IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs,
NumProtoRefs, Context);
}
CheckObjCDeclScope(CDecl);
return ActOnObjCContainerStartDefinition(CDecl);
}
/// ActOnStartCategoryImplementation - Perform semantic checks on the
/// category implementation declaration and build an ObjCCategoryImplDecl
/// object.
Decl *Sema::ActOnStartCategoryImplementation(
SourceLocation AtCatImplLoc,
IdentifierInfo *ClassName, SourceLocation ClassLoc,
IdentifierInfo *CatName, SourceLocation CatLoc) {
ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
ObjCCategoryDecl *CatIDecl = 0;
if (IDecl && IDecl->hasDefinition()) {
CatIDecl = IDecl->FindCategoryDeclaration(CatName);
if (!CatIDecl) {
// Category @implementation with no corresponding @interface.
// Create and install one.
CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, AtCatImplLoc,
ClassLoc, CatLoc,
CatName, IDecl);
CatIDecl->setImplicit();
}
}
ObjCCategoryImplDecl *CDecl =
ObjCCategoryImplDecl::Create(Context, CurContext, CatName, IDecl,
ClassLoc, AtCatImplLoc, CatLoc);
/// Check that class of this category is already completely declared.
if (!IDecl) {
Diag(ClassLoc, diag::err_undef_interface) << ClassName;
CDecl->setInvalidDecl();
} else if (RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
diag::err_undef_interface)) {
CDecl->setInvalidDecl();
}
// FIXME: PushOnScopeChains?
CurContext->addDecl(CDecl);
// If the interface is deprecated/unavailable, warn/error about it.
if (IDecl)
DiagnoseUseOfDecl(IDecl, ClassLoc);
/// Check that CatName, category name, is not used in another implementation.
if (CatIDecl) {
if (CatIDecl->getImplementation()) {
Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName
<< CatName;
Diag(CatIDecl->getImplementation()->getLocation(),
diag::note_previous_definition);
} else {
CatIDecl->setImplementation(CDecl);
// Warn on implementating category of deprecated class under
// -Wdeprecated-implementations flag.
DiagnoseObjCImplementedDeprecations(*this,
dyn_cast<NamedDecl>(IDecl),
CDecl->getLocation(), 2);
}
}
CheckObjCDeclScope(CDecl);
return ActOnObjCContainerStartDefinition(CDecl);
}
Decl *Sema::ActOnStartClassImplementation(
SourceLocation AtClassImplLoc,
IdentifierInfo *ClassName, SourceLocation ClassLoc,
IdentifierInfo *SuperClassname,
SourceLocation SuperClassLoc) {
ObjCInterfaceDecl* IDecl = 0;
// 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);
} else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) {
RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
diag::warn_undef_interface);
} else {
// We did not find anything with the name ClassName; try to correct for
// typos in the class name.
ObjCInterfaceValidatorCCC Validator;
if (TypoCorrection Corrected = CorrectTypo(
DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope,
NULL, Validator)) {
// Suggest the (potentially) correct interface name. However, put the
// fix-it hint itself in a separate note, since changing the name in
// the warning would make the fix-it change semantics.However, don't
// provide a code-modification hint or use the typo name for recovery,
// because this is just a warning. The program may actually be correct.
IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
DeclarationName CorrectedName = Corrected.getCorrection();
Diag(ClassLoc, diag::warn_undef_interface_suggest)
<< ClassName << CorrectedName;
Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName
<< FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString());
IDecl = 0;
} else {
Diag(ClassLoc, diag::warn_undef_interface) << ClassName;
}
}
// Check that super class name is valid class name
ObjCInterfaceDecl* SDecl = 0;
if (SuperClassname) {
// Check if a different kind of symbol declared in this scope.
PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc,
LookupOrdinaryName);
if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
Diag(SuperClassLoc, diag::err_redefinition_different_kind)
<< SuperClassname;
Diag(PrevDecl->getLocation(), diag::note_previous_definition);
} else {
SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
if (SDecl && !SDecl->hasDefinition())
SDecl = 0;
if (!SDecl)
Diag(SuperClassLoc, diag::err_undef_superclass)
<< SuperClassname << ClassName;
else if (IDecl && !declaresSameEntity(IDecl->getSuperClass(), SDecl)) {
// This implementation and its interface do not have the same
// super class.
Diag(SuperClassLoc, diag::err_conflicting_super_class)
<< SDecl->getDeclName();
Diag(SDecl->getLocation(), diag::note_previous_definition);
}
}
}
if (!IDecl) {
// Legacy case of @implementation with no corresponding @interface.
// Build, chain & install the interface decl into the identifier.
// FIXME: Do we support attributes on the @implementation? If so we should
// copy them over.
IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc,
ClassName, /*PrevDecl=*/0, ClassLoc,
true);
IDecl->startDefinition();
if (SDecl) {
IDecl->setSuperClass(SDecl);
IDecl->setSuperClassLoc(SuperClassLoc);
IDecl->setEndOfDefinitionLoc(SuperClassLoc);
} else {
IDecl->setEndOfDefinitionLoc(ClassLoc);
}
PushOnScopeChains(IDecl, TUScope);
} else {
// Mark the interface as being completed, even if it was just as
// @class ....;
// declaration; the user cannot reopen it.
if (!IDecl->hasDefinition())
IDecl->startDefinition();
}
ObjCImplementationDecl* IMPDecl =
ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl,
ClassLoc, AtClassImplLoc);
if (CheckObjCDeclScope(IMPDecl))
return ActOnObjCContainerStartDefinition(IMPDecl);
// Check that there is no duplicate implementation of this class.
if (IDecl->getImplementation()) {
// FIXME: Don't leak everything!
Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName;
Diag(IDecl->getImplementation()->getLocation(),
diag::note_previous_definition);
} else { // add it to the list.
IDecl->setImplementation(IMPDecl);
PushOnScopeChains(IMPDecl, TUScope);
// Warn on implementating deprecated class under
// -Wdeprecated-implementations flag.
DiagnoseObjCImplementedDeprecations(*this,
dyn_cast<NamedDecl>(IDecl),
IMPDecl->getLocation(), 1);
}
return ActOnObjCContainerStartDefinition(IMPDecl);
}
Sema::DeclGroupPtrTy
Sema::ActOnFinishObjCImplementation(Decl *ObjCImpDecl, ArrayRef<Decl *> Decls) {
SmallVector<Decl *, 64> DeclsInGroup;
DeclsInGroup.reserve(Decls.size() + 1);