bool Sema::OOPLookupName(LookupResult &R, Scope *S) {
assert(getLangOptions().OOP && "Can perform only OOP lookup");
DefinitionName Name = R.getLookupName();
IdentifierResolver::iterator I = IdResolver.begin(Name),
IEnd = IdResolver.end();
// First we lookup local scope.
for (; S /*&& !isNamespaceOrTranslationUnitScope(S)*/; S = S->getParent()) {
DefnContext *Ctx = static_cast<DefnContext *>(S->getEntity());
// Check whether the IdResolver has anything in this scope.
bool Found = false;
for (; I != IEnd && S->isDefnScope(*I); ++I) {
if (R.isAcceptableDefn(*I)) {
Found = true;
R.addDefn(*I);
}
}
if (Found) {
R.resolveKind();
if (S->isClassScope())
if (UserClassDefn *Record = dyn_cast_or_null<UserClassDefn>(Ctx))
R.setNamingClass(Record);
return true;
}
if (Ctx) {
for (; Ctx; Ctx = Ctx->getParent()) {
// We do not look directly into function or method contexts,
// since all of the local variables and parameters of the
// function/method are present within the Scope.
if (Ctx->isFunctionOrMethod()) {
continue;
}
// Perform qualified name lookup into this context.
// FIXME: In some cases, we know that every name that could be found by
// this qualified name lookup will also be on the identifier chain. For
// example, inside a class without any base classes, we never need to
// perform qualified lookup because all of the members are on top of the
// identifier chain.
if (LookupQualifiedName(R, Ctx, /*InUnqualifiedLookup=*/true))
return true;
}
}
}
// Stop if we ran out of scopes.
// FIXME: This really, really shouldn't be happening.
if (!S) return false;
// If we are looking for members, no need to look into global/namespace scope.
if (R.getLookupKind() == LookupMemberName)
return false;
return !R.empty();
}
//===----------------------------------------------------------------------===//
// Sema
//===----------------------------------------------------------------------===//
bool Sema::LookupName(LookupResult &R, Scope *S, bool AllowBuiltinCreation) {
DefinitionName Name = R.getLookupName();
if (!Name) return false;
// FIXME yabin
// LookupNameKind NameKind = R.getLookupKind();
if (!getLangOptions().OOP) {
// Unqualified name lookup in non-oop is purely lexical, so
// search in the definitions attached to the name.
unsigned IDNS = R.getIdentifierNamespace();
// Scan up the scope chain looking for a defn that matches this
// identifier that is in the appropriate namespace. This search
// should not take long, as shadowing of names is uncommon, and
// deep shadowing is extremely uncommon.
// bool LeftStartingScope = false;
for (IdentifierResolver::iterator I = IdResolver.begin(Name), IEnd =
IdResolver.end(); I != IEnd; ++I) {
if ((*I)->isInIdentifierNamespace(IDNS)) {
R.addDefn(*I);
R.resolveKind();
return true;
}
}
} else {
// Perform OOP unqualified name lookup.
if (OOPLookupName(R, S))
return true;
}
// If we didn't find a use of this identifier, and if the identifier
// corresponds to a compiler builtin, create the defn object for the builtin
// now, injecting it into top scope, and return it.
if (AllowBuiltinCreation)
return LookupBuiltin(*this, R);
return false;
}
bool DeclExtractor::CheckTagDeclaration(TagDecl* NewTD,
LookupResult& Previous){
// If the decl is already known invalid, don't check it.
if (NewTD->isInvalidDecl())
return false;
IdentifierInfo* Name = NewTD->getIdentifier();
// If this is not a definition, it must have a name.
assert((Name != 0 || NewTD->isThisDeclarationADefinition()) &&
"Nameless record must be a definition!");
// Figure out the underlying type if this a enum declaration. We need to do
// this early, because it's needed to detect if this is an incompatible
// redeclaration.
TagDecl::TagKind Kind = NewTD->getTagKind();
bool Invalid = false;
assert(NewTD->getNumTemplateParameterLists() == 0
&& "Cannot handle that yet!");
bool isExplicitSpecialization = false;
if (Kind == TTK_Enum) {
EnumDecl* ED = cast<EnumDecl>(NewTD);
bool ScopedEnum = ED->isScoped();
const QualType QT = ED->getIntegerType();
if (QT.isNull() && ScopedEnum)
// No underlying type explicitly specified, or we failed to parse the
// type, default to int.
; //EnumUnderlying = m_Context->IntTy.getTypePtr();
else if (!QT.isNull()) {
// C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
// integral type; any cv-qualification is ignored.
SourceLocation UnderlyingLoc;
TypeSourceInfo* TI = 0;
if ((TI = ED->getIntegerTypeSourceInfo()))
UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
if (!QT->isDependentType() && !QT->isIntegralType(*m_Context)) {
m_Sema->Diag(UnderlyingLoc, diag::err_enum_invalid_underlying)
<< QT;
}
if (TI)
m_Sema->DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI,
Sema::UPPC_FixedUnderlyingType);
}
}
DeclContext *SearchDC = m_Sema->CurContext;
DeclContext *DC = m_Sema->CurContext;
//bool isStdBadAlloc = false;
SourceLocation NameLoc = NewTD->getLocation();
// if (Name && SS.isNotEmpty()) {
// // We have a nested-name tag ('struct foo::bar').
// // Check for invalid 'foo::'.
// if (SS.isInvalid()) {
// Name = 0;
// goto CreateNewDecl;
// }
// // If this is a friend or a reference to a class in a dependent
// // context, don't try to make a decl for it.
// if (TUK == TUK_Friend || TUK == TUK_Reference) {
// DC = computeDeclContext(SS, false);
// if (!DC) {
// IsDependent = true;
// return 0;
// }
// } else {
// DC = computeDeclContext(SS, true);
// if (!DC) {
// Diag(SS.getRange().getBegin(),
// diag::err_dependent_nested_name_spec)
// << SS.getRange();
// return 0;
// }
// }
// if (RequireCompleteDeclContext(SS, DC))
// return 0;
// SearchDC = DC;
// // Look-up name inside 'foo::'.
// LookupQualifiedName(Previous, DC);
// if (Previous.isAmbiguous())
// return 0;
// if (Previous.empty()) {
// // Name lookup did not find anything. However, if the
// // nested-name-specifier refers to the current instantiation,
// // and that current instantiation has any dependent base
// // classes, we might find something at instantiation time: treat
// // this as a dependent elaborated-type-specifier.
// // But this only makes any sense for reference-like lookups.
// if (Previous.wasNotFoundInCurrentInstantiation() &&
// (TUK == TUK_Reference || TUK == TUK_Friend)) {
// IsDependent = true;
// return 0;
// }
// // A tag 'foo::bar' must already exist.
// Diag(NameLoc, diag::err_not_tag_in_scope)
// << Kind << Name << DC << SS.getRange();
// Name = 0;
// Invalid = true;
// goto CreateNewDecl;
// }
//} else
if (Name) {
// If this is a named struct, check to see if there was a previous forward
// declaration or definition.
// FIXME: We're looking into outer scopes here, even when we
// shouldn't be. Doing so can result in ambiguities that we
// shouldn't be diagnosing.
//LookupName(Previous, S);
if (Previous.isAmbiguous()) {
LookupResult::Filter F = Previous.makeFilter();
while (F.hasNext()) {
NamedDecl *ND = F.next();
if (ND->getDeclContext()->getRedeclContext() != SearchDC)
F.erase();
}
F.done();
}
// Note: there used to be some attempt at recovery here.
if (Previous.isAmbiguous()) {
return false;
}
if (!m_Sema->getLangOpts().CPlusPlus) {
// FIXME: This makes sure that we ignore the contexts associated
// with C structs, unions, and enums when looking for a matching
// tag declaration or definition. See the similar lookup tweak
// in Sema::LookupName; is there a better way to deal with this?
while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
SearchDC = SearchDC->getParent();
}
} else if (m_Sema->getScopeForContext(m_Sema->CurContext)
->isFunctionPrototypeScope()) {
// If this is an enum declaration in function prototype scope, set its
// initial context to the translation unit.
SearchDC = m_Context->getTranslationUnitDecl();
}
if (Previous.isSingleResult() &&
Previous.getFoundDecl()->isTemplateParameter()) {
// Maybe we will complain about the shadowed template parameter.
m_Sema->DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
// Just pretend that we didn't see the previous declaration.
Previous.clear();
}
if (m_Sema->getLangOpts().CPlusPlus && Name && DC && m_Sema->StdNamespace
&& DC->Equals(m_Sema->getStdNamespace()) && Name->isStr("bad_alloc")) {
// This is a declaration of or a reference to "std::bad_alloc".
//isStdBadAlloc = true;
if (Previous.empty() && m_Sema->StdBadAlloc) {
// std::bad_alloc has been implicitly declared (but made invisible to
// name lookup). Fill in this implicit declaration as the previous
// declaration, so that the declarations get chained appropriately.
Previous.addDecl(m_Sema->getStdBadAlloc());
}
}
if (!Previous.empty()) {
NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
// It's okay to have a tag decl in the same scope as a typedef
// which hides a tag decl in the same scope. Finding this
// insanity with a redeclaration lookup can only actually happen
// in C++.
//
// This is also okay for elaborated-type-specifiers, which is
// technically forbidden by the current standard but which is
// okay according to the likely resolution of an open issue;
// see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
if (m_Sema->getLangOpts().CPlusPlus) {
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
TagDecl *Tag = TT->getDecl();
if (Tag->getDeclName() == Name &&
Tag->getDeclContext()->getRedeclContext()
->Equals(TD->getDeclContext()->getRedeclContext())) {
PrevDecl = Tag;
Previous.clear();
Previous.addDecl(Tag);
Previous.resolveKind();
}
}
}
}
if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
// If this is a use of a previous tag, or if the tag is already declared
// in the same scope (so that the definition/declaration completes or
// rementions the tag), reuse the decl.
if (m_Sema->isDeclInScope(PrevDecl, SearchDC,
m_Sema->getScopeForContext(m_Sema->CurContext),
isExplicitSpecialization)) {
// Make sure that this wasn't declared as an enum and now used as a
// struct or something similar.
SourceLocation KWLoc = NewTD->getLocStart();
if (!m_Sema->isAcceptableTagRedeclaration(PrevTagDecl, Kind,
NewTD->isThisDeclarationADefinition(),
KWLoc, *Name)) {
bool SafeToContinue
= (PrevTagDecl->getTagKind() != TTK_Enum && Kind != TTK_Enum);
if (SafeToContinue)
m_Sema->Diag(KWLoc, diag::err_use_with_wrong_tag)
<< Name
<< FixItHint::CreateReplacement(SourceRange(KWLoc),
PrevTagDecl->getKindName());
else
m_Sema->Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
m_Sema->Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
if (SafeToContinue)
Kind = PrevTagDecl->getTagKind();
else {
// Recover by making this an anonymous redefinition.
Name = 0;
Previous.clear();
Invalid = true;
}
}
if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
const EnumDecl *NewEnum = cast<EnumDecl>(NewTD);
const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
// All conflicts with previous declarations are recovered by
// returning the previous declaration.
if (NewEnum->isScoped() != PrevEnum->isScoped()) {
m_Sema->Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch)
<< PrevEnum->isScoped();
m_Sema->Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
return false;
}
else if (PrevEnum->isFixed()) {
QualType T = NewEnum->getIntegerType();
if (!m_Context->hasSameUnqualifiedType(T,
PrevEnum->getIntegerType())) {
m_Sema->Diag(NameLoc.isValid() ? NameLoc : KWLoc,
diag::err_enum_redeclare_type_mismatch)
<< T
<< PrevEnum->getIntegerType();
m_Sema->Diag(PrevTagDecl->getLocation(),
diag::note_previous_use);
return false;
}
}
else if (NewEnum->isFixed() != PrevEnum->isFixed()) {
m_Sema->Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch)
<< PrevEnum->isFixed();
m_Sema->Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
return false;
}
}
if (!Invalid) {
// If this is a use, just return the declaration we found.
// Diagnose attempts to redefine a tag.
if (NewTD->isThisDeclarationADefinition()) {
if (TagDecl* Def = PrevTagDecl->getDefinition()) {
// If we're defining a specialization and the previous
// definition is from an implicit instantiation, don't emit an
// error here; we'll catch this in the general case below.
if (!isExplicitSpecialization ||
!isa<CXXRecordDecl>(Def) ||
cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
== TSK_ExplicitSpecialization) {
m_Sema->Diag(NameLoc, diag::err_redefinition) << Name;
m_Sema->Diag(Def->getLocation(),
diag::note_previous_definition);
// If this is a redefinition, recover by making this
// struct be anonymous, which will make any later
// references get the previous definition.
Name = 0;
Previous.clear();
Invalid = true;
}
} else {
// If the type is currently being defined, complain
// about a nested redefinition.
const TagType *Tag
= cast<TagType>(m_Context->getTagDeclType(PrevTagDecl));
if (Tag->isBeingDefined()) {
m_Sema->Diag(NameLoc, diag::err_nested_redefinition) << Name;
m_Sema->Diag(PrevTagDecl->getLocation(),
diag::note_previous_definition);
Name = 0;
Previous.clear();
Invalid = true;
}
}
// Okay, this is definition of a previously declared or referenced
// tag PrevDecl. We're going to create a new Decl for it.
}
}
// If we get here we have (another) forward declaration or we
// have a definition. Just create a new decl.
} else {
// If we get here, this is a definition of a new tag type in a nested
// scope, e.g. "struct foo; void bar() { struct foo; }", just create a
// new decl/type. We set PrevDecl to NULL so that the entities
// have distinct types.
Previous.clear();
}
// If we get here, we're going to create a new Decl. If PrevDecl
// is non-NULL, it's a definition of the tag declared by
// PrevDecl. If it's NULL, we have a new definition.
// Otherwise, PrevDecl is not a tag, but was found with tag
// lookup. This is only actually possible in C++, where a few
// things like templates still live in the tag namespace.
} else {
assert(m_Sema->getLangOpts().CPlusPlus);
// Diagnose if the declaration is in scope.
if (!m_Sema->isDeclInScope(PrevDecl, SearchDC,
m_Sema->getScopeForContext(m_Sema->CurContext),
isExplicitSpecialization)) {
// do nothing
// Otherwise it's a declaration. Call out a particularly common
// case here.
} else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
unsigned Kind = 0;
if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
m_Sema->Diag(NameLoc, diag::err_tag_definition_of_typedef)
<< Name << Kind << TND->getUnderlyingType();
m_Sema->Diag(PrevDecl->getLocation(),
diag::note_previous_decl) << PrevDecl;
Invalid = true;
// Otherwise, diagnose.
} else {
// The tag name clashes with something else in the target scope,
// issue an error and recover by making this tag be anonymous.
m_Sema->Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
m_Sema->Diag(PrevDecl->getLocation(), diag::note_previous_definition);
Name = 0;
Invalid = true;
}
// The existing declaration isn't relevant to us; we're in a
// new scope, so clear out the previous declaration.
Previous.clear();
}
}
if (Invalid) {
return false;
}
return true;
}