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-rw-r--r--clang/lib/AST/Decl.cpp53
-rw-r--r--clang/lib/Sema/SemaDecl.cpp16
-rw-r--r--clang/lib/Sema/SemaTemplate.cpp47
-rw-r--r--clang/lib/Sema/SemaTemplateInstantiateDecl.cpp40
-rw-r--r--clang/lib/Sema/SemaType.cpp4
-rw-r--r--clang/lib/Serialization/ASTReaderDecl.cpp24
-rw-r--r--clang/lib/Serialization/ASTWriterDecl.cpp4
7 files changed, 153 insertions, 35 deletions
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index e330e31d47f..3d601ee40e0 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -1926,6 +1926,9 @@ VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
//
// FIXME: How do you declare (but not define) a partial specialization of
// a static data member template outside the containing class?
+ if (isThisDeclarationADemotedDefinition())
+ return DeclarationOnly;
+
if (isStaticDataMember()) {
if (isOutOfLine() &&
!(getCanonicalDecl()->isInline() &&
@@ -2250,6 +2253,56 @@ bool VarDecl::checkInitIsICE() const {
return Eval->IsICE;
}
+VarDecl *VarDecl::getTemplateInstantiationPattern() const {
+ // If it's a variable template specialization, find the template or partial
+ // specialization from which it was instantiated.
+ if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(this)) {
+ auto From = VDTemplSpec->getInstantiatedFrom();
+ if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
+ while (auto *NewVTD = VTD->getInstantiatedFromMemberTemplate()) {
+ if (NewVTD->isMemberSpecialization())
+ break;
+ VTD = NewVTD;
+ }
+ return VTD->getTemplatedDecl()->getDefinition();
+ }
+ if (auto *VTPSD =
+ From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
+ while (auto *NewVTPSD = VTPSD->getInstantiatedFromMember()) {
+ if (NewVTPSD->isMemberSpecialization())
+ break;
+ VTPSD = NewVTPSD;
+ }
+ return VTPSD->getDefinition();
+ }
+ }
+
+ if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
+ if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
+ VarDecl *VD = getInstantiatedFromStaticDataMember();
+ while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
+ VD = NewVD;
+ return VD->getDefinition();
+ }
+ }
+
+ if (VarTemplateDecl *VarTemplate = getDescribedVarTemplate()) {
+
+ while (VarTemplate->getInstantiatedFromMemberTemplate()) {
+ if (VarTemplate->isMemberSpecialization())
+ break;
+ VarTemplate = VarTemplate->getInstantiatedFromMemberTemplate();
+ }
+
+ assert((!VarTemplate->getTemplatedDecl() ||
+ !isTemplateInstantiation(getTemplateSpecializationKind())) &&
+ "couldn't find pattern for variable instantiation");
+
+ return VarTemplate->getTemplatedDecl();
+ }
+ return nullptr;
+}
+
VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
return cast<VarDecl>(MSI->getInstantiatedFrom());
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 7baa85a6464..fa15b530add 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9708,6 +9708,22 @@ void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
VDecl->getDeclContext()->isDependentContext())) {
// The previous definition is hidden, and multiple definitions are
// permitted (in separate TUs). Form another definition of it.
+ if (!isa<ParmVarDecl>(VDecl)) {
+ // Demote the newly parsed definition to a fake declaration.
+ if (!VDecl->isThisDeclarationADemotedDefinition())
+ VDecl->demoteThisDefinitionToDeclaration();
+
+ // Make the definition visible from the point of the demotion on.
+ assert (!Hidden || Def == Hidden &&
+ "We were suggested another hidden definition!");
+ makeMergedDefinitionVisible(Def, VDecl->getLocation());
+
+ // If this is a variable template definition, make its enclosing template
+ // visible.
+ if (VarDecl *VarPattern = Def->getTemplateInstantiationPattern())
+ if (VarPattern->isThisDeclarationADefinition())
+ makeMergedDefinitionVisible(VarPattern, VDecl->getLocation());
+ }
} else {
Diag(VDecl->getLocation(), diag::err_redefinition)
<< VDecl->getDeclName();
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 0a03f8efc14..71b2153d05a 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -466,10 +466,14 @@ bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
const NamedDecl *PatternDef,
TemplateSpecializationKind TSK,
bool Complain /*= true*/) {
- assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation));
+ assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||
+ isa<VarDecl>(Instantiation));
- if (PatternDef && (isa<FunctionDecl>(PatternDef)
- || !cast<TagDecl>(PatternDef)->isBeingDefined())) {
+ bool IsEntityBeingDefined = false;
+ if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef))
+ IsEntityBeingDefined = TD->isBeingDefined();
+
+ if (PatternDef && !IsEntityBeingDefined) {
NamedDecl *SuggestedDef = nullptr;
if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef,
/*OnlyNeedComplete*/false)) {
@@ -486,13 +490,14 @@ bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
if (!Complain || (PatternDef && PatternDef->isInvalidDecl()))
return true;
+ llvm::Optional<unsigned> Note;
QualType InstantiationTy;
if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation))
InstantiationTy = Context.getTypeDeclType(TD);
if (PatternDef) {
Diag(PointOfInstantiation,
diag::err_template_instantiate_within_definition)
- << (TSK != TSK_ImplicitInstantiation)
+ << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation)
<< InstantiationTy;
// Not much point in noting the template declaration here, since
// we're lexically inside it.
@@ -501,28 +506,44 @@ bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation,
if (isa<FunctionDecl>(Instantiation)) {
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_member)
- << 1 << Instantiation->getDeclName() << Instantiation->getDeclContext();
+ << /*member function*/ 1 << Instantiation->getDeclName()
+ << Instantiation->getDeclContext();
+ Note = diag::note_explicit_instantiation_here;
} else {
+ assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!");
Diag(PointOfInstantiation,
diag::err_implicit_instantiate_member_undefined)
<< InstantiationTy;
+ Note = diag::note_member_declared_at;
}
- Diag(Pattern->getLocation(), isa<FunctionDecl>(Instantiation)
- ? diag::note_explicit_instantiation_here
- : diag::note_member_declared_at);
} else {
- if (isa<FunctionDecl>(Instantiation))
+ if (isa<FunctionDecl>(Instantiation)) {
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_func_template)
<< Pattern;
- else
+ Note = diag::note_explicit_instantiation_here;
+ } else if (isa<TagDecl>(Instantiation)) {
Diag(PointOfInstantiation, diag::err_template_instantiate_undefined)
<< (TSK != TSK_ImplicitInstantiation)
<< InstantiationTy;
- Diag(Pattern->getLocation(), isa<FunctionDecl>(Instantiation)
- ? diag::note_explicit_instantiation_here
- : diag::note_template_decl_here);
+ Note = diag::note_template_decl_here;
+ } else {
+ assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!");
+ if (isa<VarTemplateSpecializationDecl>(Instantiation)) {
+ Diag(PointOfInstantiation,
+ diag::err_explicit_instantiation_undefined_var_template)
+ << Instantiation;
+ Instantiation->setInvalidDecl();
+ } else
+ Diag(PointOfInstantiation,
+ diag::err_explicit_instantiation_undefined_member)
+ << /*static data member*/ 2 << Instantiation->getDeclName()
+ << Instantiation->getDeclContext();
+ Note = diag::note_explicit_instantiation_here;
+ }
}
+ if (Note) // Diagnostics were emitted.
+ Diag(Pattern->getLocation(), Note.getValue());
// In general, Instantiation isn't marked invalid to get more than one
// error for multiple undefined instantiations. But the code that does
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 09068d71ffb..911bc512c87 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -4068,6 +4068,10 @@ void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
PrettyDeclStackTraceEntry CrashInfo(*this, Var, SourceLocation(),
"instantiating variable initializer");
+ // The instantiation is visible here, even if it was first declared in an
+ // unimported module.
+ Var->setHidden(false);
+
// If we're performing recursive template instantiation, create our own
// queue of pending implicit instantiations that we will instantiate
// later, while we're still within our own instantiation context.
@@ -4116,33 +4120,17 @@ void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
Def = PatternDecl->getDefinition();
}
- // FIXME: Check that the definition is visible before trying to instantiate
- // it. This requires us to track the instantiation stack in order to know
- // which definitions should be visible.
+ TemplateSpecializationKind TSK = Var->getTemplateSpecializationKind();
// If we don't have a definition of the variable template, we won't perform
// any instantiation. Rather, we rely on the user to instantiate this
// definition (or provide a specialization for it) in another translation
// unit.
- if (!Def) {
- if (DefinitionRequired) {
- if (VarSpec) {
- Diag(PointOfInstantiation,
- diag::err_explicit_instantiation_undefined_var_template) << Var;
- Var->setInvalidDecl();
- }
- else
- Diag(PointOfInstantiation,
- diag::err_explicit_instantiation_undefined_member)
- << 2 << Var->getDeclName() << Var->getDeclContext();
- Diag(PatternDecl->getLocation(),
- diag::note_explicit_instantiation_here);
- } else if (Var->getTemplateSpecializationKind()
- == TSK_ExplicitInstantiationDefinition) {
+ if (!Def && !DefinitionRequired) {
+ if (TSK == TSK_ExplicitInstantiationDefinition) {
PendingInstantiations.push_back(
std::make_pair(Var, PointOfInstantiation));
- } else if (Var->getTemplateSpecializationKind()
- == TSK_ImplicitInstantiation) {
+ } else if (TSK == TSK_ImplicitInstantiation) {
// Warn about missing definition at the end of translation unit.
if (AtEndOfTU && !getDiagnostics().hasErrorOccurred()) {
Diag(PointOfInstantiation, diag::warn_var_template_missing)
@@ -4151,12 +4139,20 @@ void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
if (getLangOpts().CPlusPlus11)
Diag(PointOfInstantiation, diag::note_inst_declaration_hint) << Var;
}
+ return;
}
- return;
}
- TemplateSpecializationKind TSK = Var->getTemplateSpecializationKind();
+ // FIXME: We need to track the instantiation stack in order to know which
+ // definitions should be visible within this instantiation.
+ // FIXME: Produce diagnostics when Var->getInstantiatedFromStaticDataMember().
+ if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Var,
+ /*InstantiatedFromMember*/false,
+ PatternDecl, Def, TSK,
+ /*Complain*/DefinitionRequired))
+ return;
+
// Never instantiate an explicit specialization.
if (TSK == TSK_ExplicitSpecialization)
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
index 0f2ec79ba38..41ff13a1037 100644
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -6888,6 +6888,10 @@ bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
if (auto *Pattern = FD->getTemplateInstantiationPattern())
FD = Pattern;
D = FD->getDefinition();
+ } else if (auto *VD = dyn_cast<VarDecl>(D)) {
+ if (auto *Pattern = VD->getTemplateInstantiationPattern())
+ VD = Pattern;
+ D = VD->getDefinition();
}
assert(D && "missing definition for pattern of instantiated definition");
diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 19113da7e3c..cd232251e23 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -1216,6 +1216,7 @@ ASTDeclReader::RedeclarableResult ASTDeclReader::VisitVarDeclImpl(VarDecl *VD) {
VD->VarDeclBits.TSCSpec = Record[Idx++];
VD->VarDeclBits.InitStyle = Record[Idx++];
if (!isa<ParmVarDecl>(VD)) {
+ VD->NonParmVarDeclBits.IsThisDeclarationADemotedDefinition = Record[Idx++];
VD->NonParmVarDeclBits.ExceptionVar = Record[Idx++];
VD->NonParmVarDeclBits.NRVOVariable = Record[Idx++];
VD->NonParmVarDeclBits.CXXForRangeDecl = Record[Idx++];
@@ -3069,6 +3070,29 @@ void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
namespace clang {
template<>
void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
+ Redeclarable<VarDecl> *D,
+ Decl *Previous, Decl *Canon) {
+ VarDecl *VD = static_cast<VarDecl*>(D);
+ VarDecl *PrevVD = cast<VarDecl>(Previous);
+ D->RedeclLink.setPrevious(PrevVD);
+ D->First = PrevVD->First;
+
+ // We should keep at most one definition on the chain.
+ if (VD->isThisDeclarationADefinition()) {
+ for (VarDecl *CurD = PrevVD; CurD; CurD = CurD->getPreviousDecl()) {
+ // If we find an already demoted definition, this we already visited this
+ // part of the chain. Reduces the loop from quadratic-time to linear-time.
+ if (CurD->isThisDeclarationADemotedDefinition() ||
+ CurD->isThisDeclarationADefinition()) {
+ VD->demoteThisDefinitionToDeclaration();
+ break;
+ }
+ }
+ }
+}
+
+template<>
+void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
Redeclarable<FunctionDecl> *D,
Decl *Previous, Decl *Canon) {
FunctionDecl *FD = static_cast<FunctionDecl*>(D);
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index a0fc1559ce9..21468619dba 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -894,6 +894,7 @@ void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
Record.push_back(D->getTSCSpec());
Record.push_back(D->getInitStyle());
if (!isa<ParmVarDecl>(D)) {
+ Record.push_back(D->isThisDeclarationADemotedDefinition());
Record.push_back(D->isExceptionVariable());
Record.push_back(D->isNRVOVariable());
Record.push_back(D->isCXXForRangeDecl());
@@ -998,6 +999,8 @@ void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
// Check things we know are true of *every* PARM_VAR_DECL, which is more than
// just us assuming it.
assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
+ assert(!D->isThisDeclarationADemotedDefinition()
+ && "PARM_VAR_DECL can't be demoted definition.");
assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
@@ -1957,6 +1960,7 @@ void ASTWriter::WriteDeclAbbrevs() {
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // SClass
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // TSCSpec
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // InitStyle
+ Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsThisDeclarationADemotedDefinition
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
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