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llvm-project/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
Douglas Gregor 14cf752486 Clean up our handling of local instantiation scopes, which keep track 
of the mapping from local declarations to their instantiated
counterparts during template instantiation. Previously, we tried to do
some unholy merging of local instantiation scopes that involved
storing a single hash table along with an "undo" list on the
side... which was ugly, and never handled function parameters
properly.

Now, we just keep separate hash tables for each local instantiation
scope, and "combining" two scopes means that we'll look in each of the
combined hash tables. The combined scope stack is rarely deep, and
this makes it easy to avoid the "undo" issues we were hitting. Also,
I've simplified the logic for function parameters: if we're declaring
a function and we need the function parameters to live longer, we just
push them back into the local instantiation scope where we need them. 

Fixes PR6990.

llvm-svn: 102732
2010-04-30 18:55:50 +00:00

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102 KiB
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//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===/
//
// This file implements C++ template instantiation for declarations.
//
//===----------------------------------------------------------------------===/
#include "Sema.h"
#include "Lookup.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/DependentDiagnostic.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/TypeLoc.h"
#include "clang/Basic/PrettyStackTrace.h"
#include "clang/Lex/Preprocessor.h"
using namespace clang;
namespace {
class TemplateDeclInstantiator
: public DeclVisitor<TemplateDeclInstantiator, Decl *> {
Sema &SemaRef;
DeclContext *Owner;
const MultiLevelTemplateArgumentList &TemplateArgs;
void InstantiateAttrs(Decl *Tmpl, Decl *New);
public:
typedef Sema::OwningExprResult OwningExprResult;
TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner,
const MultiLevelTemplateArgumentList &TemplateArgs)
: SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { }
// FIXME: Once we get closer to completion, replace these manually-written
// declarations with automatically-generated ones from
// clang/AST/DeclNodes.def.
Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D);
Decl *VisitNamespaceDecl(NamespaceDecl *D);
Decl *VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
Decl *VisitTypedefDecl(TypedefDecl *D);
Decl *VisitVarDecl(VarDecl *D);
Decl *VisitFieldDecl(FieldDecl *D);
Decl *VisitStaticAssertDecl(StaticAssertDecl *D);
Decl *VisitEnumDecl(EnumDecl *D);
Decl *VisitEnumConstantDecl(EnumConstantDecl *D);
Decl *VisitFriendDecl(FriendDecl *D);
Decl *VisitFunctionDecl(FunctionDecl *D,
TemplateParameterList *TemplateParams = 0);
Decl *VisitCXXRecordDecl(CXXRecordDecl *D);
Decl *VisitCXXMethodDecl(CXXMethodDecl *D,
TemplateParameterList *TemplateParams = 0);
Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D);
Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D);
Decl *VisitCXXConversionDecl(CXXConversionDecl *D);
ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D);
Decl *VisitClassTemplateDecl(ClassTemplateDecl *D);
Decl *VisitClassTemplatePartialSpecializationDecl(
ClassTemplatePartialSpecializationDecl *D);
Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
Decl *VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
Decl *VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
Decl *VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
Decl *VisitUsingDecl(UsingDecl *D);
Decl *VisitUsingShadowDecl(UsingShadowDecl *D);
Decl *VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
Decl *VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
// Base case. FIXME: Remove once we can instantiate everything.
Decl *VisitDecl(Decl *D) {
unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID(
Diagnostic::Error,
"cannot instantiate %0 yet");
SemaRef.Diag(D->getLocation(), DiagID)
<< D->getDeclKindName();
return 0;
}
const LangOptions &getLangOptions() {
return SemaRef.getLangOptions();
}
// Helper functions for instantiating methods.
TypeSourceInfo *SubstFunctionType(FunctionDecl *D,
llvm::SmallVectorImpl<ParmVarDecl *> &Params);
bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl);
bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl);
TemplateParameterList *
SubstTemplateParams(TemplateParameterList *List);
bool SubstQualifier(const DeclaratorDecl *OldDecl,
DeclaratorDecl *NewDecl);
bool SubstQualifier(const TagDecl *OldDecl,
TagDecl *NewDecl);
bool InstantiateClassTemplatePartialSpecialization(
ClassTemplateDecl *ClassTemplate,
ClassTemplatePartialSpecializationDecl *PartialSpec);
};
}
bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl,
DeclaratorDecl *NewDecl) {
NestedNameSpecifier *OldQual = OldDecl->getQualifier();
if (!OldQual) return false;
SourceRange QualRange = OldDecl->getQualifierRange();
NestedNameSpecifier *NewQual
= SemaRef.SubstNestedNameSpecifier(OldQual, QualRange, TemplateArgs);
if (!NewQual)
return true;
NewDecl->setQualifierInfo(NewQual, QualRange);
return false;
}
bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl,
TagDecl *NewDecl) {
NestedNameSpecifier *OldQual = OldDecl->getQualifier();
if (!OldQual) return false;
SourceRange QualRange = OldDecl->getQualifierRange();
NestedNameSpecifier *NewQual
= SemaRef.SubstNestedNameSpecifier(OldQual, QualRange, TemplateArgs);
if (!NewQual)
return true;
NewDecl->setQualifierInfo(NewQual, QualRange);
return false;
}
// FIXME: Is this too simple?
void TemplateDeclInstantiator::InstantiateAttrs(Decl *Tmpl, Decl *New) {
for (const Attr *TmplAttr = Tmpl->getAttrs(); TmplAttr;
TmplAttr = TmplAttr->getNext()) {
// FIXME: Is cloning correct for all attributes?
Attr *NewAttr = TmplAttr->clone(SemaRef.Context);
New->addAttr(NewAttr);
}
}
Decl *
TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
assert(false && "Translation units cannot be instantiated");
return D;
}
Decl *
TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) {
assert(false && "Namespaces cannot be instantiated");
return D;
}
Decl *
TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
NamespaceAliasDecl *Inst
= NamespaceAliasDecl::Create(SemaRef.Context, Owner,
D->getNamespaceLoc(),
D->getAliasLoc(),
D->getNamespace()->getIdentifier(),
D->getQualifierRange(),
D->getQualifier(),
D->getTargetNameLoc(),
D->getNamespace());
Owner->addDecl(Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
bool Invalid = false;
TypeSourceInfo *DI = D->getTypeSourceInfo();
if (DI->getType()->isDependentType()) {
DI = SemaRef.SubstType(DI, TemplateArgs,
D->getLocation(), D->getDeclName());
if (!DI) {
Invalid = true;
DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy);
}
}
// Create the new typedef
TypedefDecl *Typedef
= TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getIdentifier(), DI);
if (Invalid)
Typedef->setInvalidDecl();
if (const TagType *TT = DI->getType()->getAs<TagType>()) {
TagDecl *TD = TT->getDecl();
// If the TagDecl that the TypedefDecl points to is an anonymous decl
// keep track of the TypedefDecl.
if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl())
TD->setTypedefForAnonDecl(Typedef);
}
if (TypedefDecl *Prev = D->getPreviousDeclaration()) {
NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev,
TemplateArgs);
Typedef->setPreviousDeclaration(cast<TypedefDecl>(InstPrev));
}
Typedef->setAccess(D->getAccess());
Owner->addDecl(Typedef);
return Typedef;
}
/// \brief Instantiate the arguments provided as part of initialization.
///
/// \returns true if an error occurred, false otherwise.
static bool InstantiateInitializationArguments(Sema &SemaRef,
Expr **Args, unsigned NumArgs,
const MultiLevelTemplateArgumentList &TemplateArgs,
llvm::SmallVectorImpl<SourceLocation> &FakeCommaLocs,
ASTOwningVector<&ActionBase::DeleteExpr> &InitArgs) {
for (unsigned I = 0; I != NumArgs; ++I) {
// When we hit the first defaulted argument, break out of the loop:
// we don't pass those default arguments on.
if (Args[I]->isDefaultArgument())
break;
Sema::OwningExprResult Arg = SemaRef.SubstExpr(Args[I], TemplateArgs);
if (Arg.isInvalid())
return true;
Expr *ArgExpr = (Expr *)Arg.get();
InitArgs.push_back(Arg.release());
// FIXME: We're faking all of the comma locations. Do we need them?
FakeCommaLocs.push_back(
SemaRef.PP.getLocForEndOfToken(ArgExpr->getLocEnd()));
}
return false;
}
/// \brief Instantiate an initializer, breaking it into separate
/// initialization arguments.
///
/// \param S The semantic analysis object.
///
/// \param Init The initializer to instantiate.
///
/// \param TemplateArgs Template arguments to be substituted into the
/// initializer.
///
/// \param NewArgs Will be filled in with the instantiation arguments.
///
/// \returns true if an error occurred, false otherwise
static bool InstantiateInitializer(Sema &S, Expr *Init,
const MultiLevelTemplateArgumentList &TemplateArgs,
SourceLocation &LParenLoc,
llvm::SmallVector<SourceLocation, 4> &CommaLocs,
ASTOwningVector<&ActionBase::DeleteExpr> &NewArgs,
SourceLocation &RParenLoc) {
NewArgs.clear();
LParenLoc = SourceLocation();
RParenLoc = SourceLocation();
if (!Init)
return false;
if (CXXExprWithTemporaries *ExprTemp = dyn_cast<CXXExprWithTemporaries>(Init))
Init = ExprTemp->getSubExpr();
while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(Init))
Init = Binder->getSubExpr();
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Init))
Init = ICE->getSubExprAsWritten();
if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) {
LParenLoc = ParenList->getLParenLoc();
RParenLoc = ParenList->getRParenLoc();
return InstantiateInitializationArguments(S, ParenList->getExprs(),
ParenList->getNumExprs(),
TemplateArgs, CommaLocs,
NewArgs);
}
if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init)) {
if (!isa<CXXTemporaryObjectExpr>(Construct)) {
if (InstantiateInitializationArguments(S,
Construct->getArgs(),
Construct->getNumArgs(),
TemplateArgs,
CommaLocs, NewArgs))
return true;
// FIXME: Fake locations!
LParenLoc = S.PP.getLocForEndOfToken(Init->getLocStart());
RParenLoc = CommaLocs.empty()? LParenLoc : CommaLocs.back();
return false;
}
}
Sema::OwningExprResult Result = S.SubstExpr(Init, TemplateArgs);
if (Result.isInvalid())
return true;
NewArgs.push_back(Result.takeAs<Expr>());
return false;
}
Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
// Do substitution on the type of the declaration
TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(),
TemplateArgs,
D->getTypeSpecStartLoc(),
D->getDeclName());
if (!DI)
return 0;
// Build the instantiated declaration
VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner,
D->getLocation(), D->getIdentifier(),
DI->getType(), DI,
D->getStorageClass(),
D->getStorageClassAsWritten());
Var->setThreadSpecified(D->isThreadSpecified());
Var->setCXXDirectInitializer(D->hasCXXDirectInitializer());
Var->setDeclaredInCondition(D->isDeclaredInCondition());
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, Var))
return 0;
// If we are instantiating a static data member defined
// out-of-line, the instantiation will have the same lexical
// context (which will be a namespace scope) as the template.
if (D->isOutOfLine())
Var->setLexicalDeclContext(D->getLexicalDeclContext());
Var->setAccess(D->getAccess());
// FIXME: In theory, we could have a previous declaration for variables that
// are not static data members.
bool Redeclaration = false;
// FIXME: having to fake up a LookupResult is dumb.
LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
if (D->isStaticDataMember())
SemaRef.LookupQualifiedName(Previous, Owner, false);
SemaRef.CheckVariableDeclaration(Var, Previous, Redeclaration);
if (D->isOutOfLine()) {
D->getLexicalDeclContext()->addDecl(Var);
Owner->makeDeclVisibleInContext(Var);
} else {
Owner->addDecl(Var);
}
// Link instantiations of static data members back to the template from
// which they were instantiated.
if (Var->isStaticDataMember())
SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D,
TSK_ImplicitInstantiation);
if (Var->getAnyInitializer()) {
// We already have an initializer in the class.
} else if (D->getInit()) {
if (Var->isStaticDataMember() && !D->isOutOfLine())
SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated);
else
SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
// Instantiate the initializer.
SourceLocation LParenLoc, RParenLoc;
llvm::SmallVector<SourceLocation, 4> CommaLocs;
ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef);
if (!InstantiateInitializer(SemaRef, D->getInit(), TemplateArgs, LParenLoc,
CommaLocs, InitArgs, RParenLoc)) {
// Attach the initializer to the declaration.
if (D->hasCXXDirectInitializer()) {
// Add the direct initializer to the declaration.
SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var),
LParenLoc,
move_arg(InitArgs),
CommaLocs.data(),
RParenLoc);
} else if (InitArgs.size() == 1) {
Expr *Init = (Expr*)(InitArgs.take()[0]);
SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var),
SemaRef.Owned(Init),
false);
} else {
assert(InitArgs.size() == 0);
SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
}
} else {
// FIXME: Not too happy about invalidating the declaration
// because of a bogus initializer.
Var->setInvalidDecl();
}
SemaRef.PopExpressionEvaluationContext();
} else if (!Var->isStaticDataMember() || Var->isOutOfLine())
SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
return Var;
}
Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
bool Invalid = false;
TypeSourceInfo *DI = D->getTypeSourceInfo();
if (DI->getType()->isDependentType()) {
DI = SemaRef.SubstType(DI, TemplateArgs,
D->getLocation(), D->getDeclName());
if (!DI) {
DI = D->getTypeSourceInfo();
Invalid = true;
} else if (DI->getType()->isFunctionType()) {
// C++ [temp.arg.type]p3:
// If a declaration acquires a function type through a type
// dependent on a template-parameter and this causes a
// declaration that does not use the syntactic form of a
// function declarator to have function type, the program is
// ill-formed.
SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
<< DI->getType();
Invalid = true;
}
}
Expr *BitWidth = D->getBitWidth();
if (Invalid)
BitWidth = 0;
else if (BitWidth) {
// The bit-width expression is not potentially evaluated.
EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
OwningExprResult InstantiatedBitWidth
= SemaRef.SubstExpr(BitWidth, TemplateArgs);
if (InstantiatedBitWidth.isInvalid()) {
Invalid = true;
BitWidth = 0;
} else
BitWidth = InstantiatedBitWidth.takeAs<Expr>();
}
FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(),
DI->getType(), DI,
cast<RecordDecl>(Owner),
D->getLocation(),
D->isMutable(),
BitWidth,
D->getTypeSpecStartLoc(),
D->getAccess(),
0);
if (!Field) {
cast<Decl>(Owner)->setInvalidDecl();
return 0;
}
InstantiateAttrs(D, Field);
if (Invalid)
Field->setInvalidDecl();
if (!Field->getDeclName()) {
// Keep track of where this decl came from.
SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D);
}
Field->setImplicit(D->isImplicit());
Field->setAccess(D->getAccess());
Owner->addDecl(Field);
return Field;
}
Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) {
// Handle friend type expressions by simply substituting template
// parameters into the pattern type and checking the result.
if (TypeSourceInfo *Ty = D->getFriendType()) {
TypeSourceInfo *InstTy =
SemaRef.SubstType(Ty, TemplateArgs,
D->getLocation(), DeclarationName());
if (!InstTy)
return 0;
FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getFriendLoc(), InstTy);
if (!FD)
return 0;
FD->setAccess(AS_public);
Owner->addDecl(FD);
return FD;
}
NamedDecl *ND = D->getFriendDecl();
assert(ND && "friend decl must be a decl or a type!");
// All of the Visit implementations for the various potential friend
// declarations have to be carefully written to work for friend
// objects, with the most important detail being that the target
// decl should almost certainly not be placed in Owner.
Decl *NewND = Visit(ND);
if (!NewND) return 0;
FriendDecl *FD =
FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(),
cast<NamedDecl>(NewND), D->getFriendLoc());
FD->setAccess(AS_public);
Owner->addDecl(FD);
return FD;
}
Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
Expr *AssertExpr = D->getAssertExpr();
// The expression in a static assertion is not potentially evaluated.
EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated);
OwningExprResult InstantiatedAssertExpr
= SemaRef.SubstExpr(AssertExpr, TemplateArgs);
if (InstantiatedAssertExpr.isInvalid())
return 0;
OwningExprResult Message(SemaRef, D->getMessage());
D->getMessage()->Retain();
Decl *StaticAssert
= SemaRef.ActOnStaticAssertDeclaration(D->getLocation(),
move(InstantiatedAssertExpr),
move(Message)).getAs<Decl>();
return StaticAssert;
}
Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner,
D->getLocation(), D->getIdentifier(),
D->getTagKeywordLoc(),
/*PrevDecl=*/0);
Enum->setInstantiationOfMemberEnum(D);
Enum->setAccess(D->getAccess());
if (SubstQualifier(D, Enum)) return 0;
Owner->addDecl(Enum);
Enum->startDefinition();
if (D->getDeclContext()->isFunctionOrMethod())
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum);
llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators;
EnumConstantDecl *LastEnumConst = 0;
for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(),
ECEnd = D->enumerator_end();
EC != ECEnd; ++EC) {
// The specified value for the enumerator.
OwningExprResult Value = SemaRef.Owned((Expr *)0);
if (Expr *UninstValue = EC->getInitExpr()) {
// The enumerator's value expression is not potentially evaluated.
EnterExpressionEvaluationContext Unevaluated(SemaRef,
Action::Unevaluated);
Value = SemaRef.SubstExpr(UninstValue, TemplateArgs);
}
// Drop the initial value and continue.
bool isInvalid = false;
if (Value.isInvalid()) {
Value = SemaRef.Owned((Expr *)0);
isInvalid = true;
}
EnumConstantDecl *EnumConst
= SemaRef.CheckEnumConstant(Enum, LastEnumConst,
EC->getLocation(), EC->getIdentifier(),
move(Value));
if (isInvalid) {
if (EnumConst)
EnumConst->setInvalidDecl();
Enum->setInvalidDecl();
}
if (EnumConst) {
EnumConst->setAccess(Enum->getAccess());
Enum->addDecl(EnumConst);
Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst));
LastEnumConst = EnumConst;
if (D->getDeclContext()->isFunctionOrMethod()) {
// If the enumeration is within a function or method, record the enum
// constant as a local.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(*EC, EnumConst);
}
}
}
// FIXME: Fixup LBraceLoc and RBraceLoc
// FIXME: Empty Scope and AttributeList (required to handle attribute packed).
SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(),
Sema::DeclPtrTy::make(Enum),
&Enumerators[0], Enumerators.size(),
0, 0);
return Enum;
}
Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) {
assert(false && "EnumConstantDecls can only occur within EnumDecls.");
return 0;
}
Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) {
bool isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
// Create a local instantiation scope for this class template, which
// will contain the instantiations of the template parameters.
Sema::LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
CXXRecordDecl *Pattern = D->getTemplatedDecl();
// Instantiate the qualifier. We have to do this first in case
// we're a friend declaration, because if we are then we need to put
// the new declaration in the appropriate context.
NestedNameSpecifier *Qualifier = Pattern->getQualifier();
if (Qualifier) {
Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier,
Pattern->getQualifierRange(),
TemplateArgs);
if (!Qualifier) return 0;
}
CXXRecordDecl *PrevDecl = 0;
ClassTemplateDecl *PrevClassTemplate = 0;
// If this isn't a friend, then it's a member template, in which
// case we just want to build the instantiation in the
// specialization. If it is a friend, we want to build it in
// the appropriate context.
DeclContext *DC = Owner;
if (isFriend) {
if (Qualifier) {
CXXScopeSpec SS;
SS.setScopeRep(Qualifier);
SS.setRange(Pattern->getQualifierRange());
DC = SemaRef.computeDeclContext(SS);
if (!DC) return 0;
} else {
DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(),
Pattern->getDeclContext(),
TemplateArgs);
}
// Look for a previous declaration of the template in the owning
// context.
LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
SemaRef.LookupQualifiedName(R, DC);
if (R.isSingleResult()) {
PrevClassTemplate = R.getAsSingle<ClassTemplateDecl>();
if (PrevClassTemplate)
PrevDecl = PrevClassTemplate->getTemplatedDecl();
}
if (!PrevClassTemplate && Qualifier) {
SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope)
<< D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC
<< Pattern->getQualifierRange();
return 0;
}
bool AdoptedPreviousTemplateParams = false;
if (PrevClassTemplate) {
bool Complain = true;
// HACK: libstdc++ 4.2.1 contains an ill-formed friend class
// template for struct std::tr1::__detail::_Map_base, where the
// template parameters of the friend declaration don't match the
// template parameters of the original declaration. In this one
// case, we don't complain about the ill-formed friend
// declaration.
if (isFriend && Pattern->getIdentifier() &&
Pattern->getIdentifier()->isStr("_Map_base") &&
DC->isNamespace() &&
cast<NamespaceDecl>(DC)->getIdentifier() &&
cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__detail")) {
DeclContext *DCParent = DC->getParent();
if (DCParent->isNamespace() &&
cast<NamespaceDecl>(DCParent)->getIdentifier() &&
cast<NamespaceDecl>(DCParent)->getIdentifier()->isStr("tr1")) {
DeclContext *DCParent2 = DCParent->getParent();
if (DCParent2->isNamespace() &&
cast<NamespaceDecl>(DCParent2)->getIdentifier() &&
cast<NamespaceDecl>(DCParent2)->getIdentifier()->isStr("std") &&
DCParent2->getParent()->isTranslationUnit())
Complain = false;
}
}
TemplateParameterList *PrevParams
= PrevClassTemplate->getTemplateParameters();
// Make sure the parameter lists match.
if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams,
Complain,
Sema::TPL_TemplateMatch)) {
if (Complain)
return 0;
AdoptedPreviousTemplateParams = true;
InstParams = PrevParams;
}
// Do some additional validation, then merge default arguments
// from the existing declarations.
if (!AdoptedPreviousTemplateParams &&
SemaRef.CheckTemplateParameterList(InstParams, PrevParams,
Sema::TPC_ClassTemplate))
return 0;
}
}
CXXRecordDecl *RecordInst
= CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC,
Pattern->getLocation(), Pattern->getIdentifier(),
Pattern->getTagKeywordLoc(), PrevDecl,
/*DelayTypeCreation=*/true);
if (Qualifier)
RecordInst->setQualifierInfo(Qualifier, Pattern->getQualifierRange());
ClassTemplateDecl *Inst
= ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(),
D->getIdentifier(), InstParams, RecordInst,
PrevClassTemplate);
RecordInst->setDescribedClassTemplate(Inst);
if (isFriend) {
if (PrevClassTemplate)
Inst->setAccess(PrevClassTemplate->getAccess());
else
Inst->setAccess(D->getAccess());
Inst->setObjectOfFriendDecl(PrevClassTemplate != 0);
// TODO: do we want to track the instantiation progeny of this
// friend target decl?
} else {
Inst->setAccess(D->getAccess());
Inst->setInstantiatedFromMemberTemplate(D);
}
// Trigger creation of the type for the instantiation.
SemaRef.Context.getInjectedClassNameType(RecordInst,
Inst->getInjectedClassNameSpecialization(SemaRef.Context));
// Finish handling of friends.
if (isFriend) {
DC->makeDeclVisibleInContext(Inst, /*Recoverable*/ false);
return Inst;
}
Owner->addDecl(Inst);
// Instantiate all of the partial specializations of this member class
// template.
llvm::SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
D->getPartialSpecializations(PartialSpecs);
for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]);
return Inst;
}
Decl *
TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl(
ClassTemplatePartialSpecializationDecl *D) {
ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
// Lookup the already-instantiated declaration in the instantiation
// of the class template and return that.
DeclContext::lookup_result Found
= Owner->lookup(ClassTemplate->getDeclName());
if (Found.first == Found.second)
return 0;
ClassTemplateDecl *InstClassTemplate
= dyn_cast<ClassTemplateDecl>(*Found.first);
if (!InstClassTemplate)
return 0;
Decl *DCanon = D->getCanonicalDecl();
for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator
P = InstClassTemplate->getPartialSpecializations().begin(),
PEnd = InstClassTemplate->getPartialSpecializations().end();
P != PEnd; ++P) {
if (P->getInstantiatedFromMember()->getCanonicalDecl() == DCanon)
return &*P;
}
return 0;
}
Decl *
TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
// Create a local instantiation scope for this function template, which
// will contain the instantiations of the template parameters and then get
// merged with the local instantiation scope for the function template
// itself.
Sema::LocalInstantiationScope Scope(SemaRef);
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
FunctionDecl *Instantiated = 0;
if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl()))
Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod,
InstParams));
else
Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl(
D->getTemplatedDecl(),
InstParams));
if (!Instantiated)
return 0;
Instantiated->setAccess(D->getAccess());
// Link the instantiated function template declaration to the function
// template from which it was instantiated.
FunctionTemplateDecl *InstTemplate
= Instantiated->getDescribedFunctionTemplate();
InstTemplate->setAccess(D->getAccess());
assert(InstTemplate &&
"VisitFunctionDecl/CXXMethodDecl didn't create a template!");
bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None);
// Link the instantiation back to the pattern *unless* this is a
// non-definition friend declaration.
if (!InstTemplate->getInstantiatedFromMemberTemplate() &&
!(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition()))
InstTemplate->setInstantiatedFromMemberTemplate(D);
// Make declarations visible in the appropriate context.
if (!isFriend)
Owner->addDecl(InstTemplate);
return InstTemplate;
}
Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
CXXRecordDecl *PrevDecl = 0;
if (D->isInjectedClassName())
PrevDecl = cast<CXXRecordDecl>(Owner);
else if (D->getPreviousDeclaration()) {
NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(),
D->getPreviousDeclaration(),
TemplateArgs);
if (!Prev) return 0;
PrevDecl = cast<CXXRecordDecl>(Prev);
}
CXXRecordDecl *Record
= CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner,
D->getLocation(), D->getIdentifier(),
D->getTagKeywordLoc(), PrevDecl);
// Substitute the nested name specifier, if any.
if (SubstQualifier(D, Record))
return 0;
Record->setImplicit(D->isImplicit());
// FIXME: Check against AS_none is an ugly hack to work around the issue that
// the tag decls introduced by friend class declarations don't have an access
// specifier. Remove once this area of the code gets sorted out.
if (D->getAccess() != AS_none)
Record->setAccess(D->getAccess());
if (!D->isInjectedClassName())
Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
// If the original function was part of a friend declaration,
// inherit its namespace state.
if (Decl::FriendObjectKind FOK = D->getFriendObjectKind())
Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared);
Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion());
Owner->addDecl(Record);
return Record;
}
/// Normal class members are of more specific types and therefore
/// don't make it here. This function serves two purposes:
/// 1) instantiating function templates
/// 2) substituting friend declarations
/// FIXME: preserve function definitions in case #2
Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
TemplateParameterList *TemplateParams) {
// Check whether there is already a function template specialization for
// this declaration.
FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
void *InsertPos = 0;
if (FunctionTemplate && !TemplateParams) {
llvm::FoldingSetNodeID ID;
FunctionTemplateSpecializationInfo::Profile(ID,
TemplateArgs.getInnermost().getFlatArgumentList(),
TemplateArgs.getInnermost().flat_size(),
SemaRef.Context);
FunctionTemplateSpecializationInfo *Info
= FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
InsertPos);
// If we already have a function template specialization, return it.
if (Info)
return Info->Function;
}
bool isFriend;
if (FunctionTemplate)
isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None);
else
isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
bool MergeWithParentScope = (TemplateParams != 0) ||
!(isa<Decl>(Owner) &&
cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
llvm::SmallVector<ParmVarDecl *, 4> Params;
TypeSourceInfo *TInfo = D->getTypeSourceInfo();
TInfo = SubstFunctionType(D, Params);
if (!TInfo)
return 0;
QualType T = TInfo->getType();
NestedNameSpecifier *Qualifier = D->getQualifier();
if (Qualifier) {
Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier,
D->getQualifierRange(),
TemplateArgs);
if (!Qualifier) return 0;
}
// If we're instantiating a local function declaration, put the result
// in the owner; otherwise we need to find the instantiated context.
DeclContext *DC;
if (D->getDeclContext()->isFunctionOrMethod())
DC = Owner;
else if (isFriend && Qualifier) {
CXXScopeSpec SS;
SS.setScopeRep(Qualifier);
SS.setRange(D->getQualifierRange());
DC = SemaRef.computeDeclContext(SS);
if (!DC) return 0;
} else {
DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(),
TemplateArgs);
}
FunctionDecl *Function =
FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(),
D->getDeclName(), T, TInfo,
D->getStorageClass(), D->getStorageClassAsWritten(),
D->isInlineSpecified(), D->hasWrittenPrototype());
if (Qualifier)
Function->setQualifierInfo(Qualifier, D->getQualifierRange());
DeclContext *LexicalDC = Owner;
if (!isFriend && D->isOutOfLine()) {
assert(D->getDeclContext()->isFileContext());
LexicalDC = D->getDeclContext();
}
Function->setLexicalDeclContext(LexicalDC);
// Attach the parameters
for (unsigned P = 0; P < Params.size(); ++P)
Params[P]->setOwningFunction(Function);
Function->setParams(Params.data(), Params.size());
if (TemplateParams) {
// Our resulting instantiation is actually a function template, since we
// are substituting only the outer template parameters. For example, given
//
// template<typename T>
// struct X {
// template<typename U> friend void f(T, U);
// };
//
// X<int> x;
//
// We are instantiating the friend function template "f" within X<int>,
// which means substituting int for T, but leaving "f" as a friend function
// template.
// Build the function template itself.
FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC,
Function->getLocation(),
Function->getDeclName(),
TemplateParams, Function);
Function->setDescribedFunctionTemplate(FunctionTemplate);
FunctionTemplate->setLexicalDeclContext(LexicalDC);
if (isFriend && D->isThisDeclarationADefinition()) {
// TODO: should we remember this connection regardless of whether
// the friend declaration provided a body?
FunctionTemplate->setInstantiatedFromMemberTemplate(
D->getDescribedFunctionTemplate());
}
} else if (FunctionTemplate) {
// Record this function template specialization.
Function->setFunctionTemplateSpecialization(FunctionTemplate,
&TemplateArgs.getInnermost(),
InsertPos);
} else if (isFriend && D->isThisDeclarationADefinition()) {
// TODO: should we remember this connection regardless of whether
// the friend declaration provided a body?
Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
}
if (InitFunctionInstantiation(Function, D))
Function->setInvalidDecl();
bool Redeclaration = false;
bool OverloadableAttrRequired = false;
bool isExplicitSpecialization = false;
LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
if (DependentFunctionTemplateSpecializationInfo *Info
= D->getDependentSpecializationInfo()) {
assert(isFriend && "non-friend has dependent specialization info?");
// This needs to be set now for future sanity.
Function->setObjectOfFriendDecl(/*HasPrevious*/ true);
// Instantiate the explicit template arguments.
TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(),
Info->getRAngleLoc());
for (unsigned I = 0, E = Info->getNumTemplateArgs(); I != E; ++I) {
TemplateArgumentLoc Loc;
if (SemaRef.Subst(Info->getTemplateArg(I), Loc, TemplateArgs))
return 0;
ExplicitArgs.addArgument(Loc);
}
// Map the candidate templates to their instantiations.
for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) {
Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(),
Info->getTemplate(I),
TemplateArgs);
if (!Temp) return 0;
Previous.addDecl(cast<FunctionTemplateDecl>(Temp));
}
if (SemaRef.CheckFunctionTemplateSpecialization(Function,
&ExplicitArgs,
Previous))
Function->setInvalidDecl();
isExplicitSpecialization = true;
} else if (TemplateParams || !FunctionTemplate) {
// Look only into the namespace where the friend would be declared to
// find a previous declaration. This is the innermost enclosing namespace,
// as described in ActOnFriendFunctionDecl.
SemaRef.LookupQualifiedName(Previous, DC);
// In C++, the previous declaration we find might be a tag type
// (class or enum). In this case, the new declaration will hide the
// tag type. Note that this does does not apply if we're declaring a
// typedef (C++ [dcl.typedef]p4).
if (Previous.isSingleTagDecl())
Previous.clear();
}
SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous,
isExplicitSpecialization, Redeclaration,
/*FIXME:*/OverloadableAttrRequired);
NamedDecl *PrincipalDecl = (TemplateParams
? cast<NamedDecl>(FunctionTemplate)
: Function);
// If the original function was part of a friend declaration,
// inherit its namespace state and add it to the owner.
if (isFriend) {
NamedDecl *PrevDecl;
if (TemplateParams)
PrevDecl = FunctionTemplate->getPreviousDeclaration();
else
PrevDecl = Function->getPreviousDeclaration();
PrincipalDecl->setObjectOfFriendDecl(PrevDecl != 0);
DC->makeDeclVisibleInContext(PrincipalDecl, /*Recoverable=*/ false);
}
if (Function->isOverloadedOperator() && !DC->isRecord() &&
PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
PrincipalDecl->setNonMemberOperator();
return Function;
}
Decl *
TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
TemplateParameterList *TemplateParams) {
FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
void *InsertPos = 0;
if (FunctionTemplate && !TemplateParams) {
// We are creating a function template specialization from a function
// template. Check whether there is already a function template
// specialization for this particular set of template arguments.
llvm::FoldingSetNodeID ID;
FunctionTemplateSpecializationInfo::Profile(ID,
TemplateArgs.getInnermost().getFlatArgumentList(),
TemplateArgs.getInnermost().flat_size(),
SemaRef.Context);
FunctionTemplateSpecializationInfo *Info
= FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID,
InsertPos);
// If we already have a function template specialization, return it.
if (Info)
return Info->Function;
}
bool isFriend;
if (FunctionTemplate)
isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None);
else
isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
bool MergeWithParentScope = (TemplateParams != 0) ||
!(isa<Decl>(Owner) &&
cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
llvm::SmallVector<ParmVarDecl *, 4> Params;
TypeSourceInfo *TInfo = D->getTypeSourceInfo();
TInfo = SubstFunctionType(D, Params);
if (!TInfo)
return 0;
QualType T = TInfo->getType();
NestedNameSpecifier *Qualifier = D->getQualifier();
if (Qualifier) {
Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier,
D->getQualifierRange(),
TemplateArgs);
if (!Qualifier) return 0;
}
DeclContext *DC = Owner;
if (isFriend) {
if (Qualifier) {
CXXScopeSpec SS;
SS.setScopeRep(Qualifier);
SS.setRange(D->getQualifierRange());
DC = SemaRef.computeDeclContext(SS);
} else {
DC = SemaRef.FindInstantiatedContext(D->getLocation(),
D->getDeclContext(),
TemplateArgs);
}
if (!DC) return 0;
}
// Build the instantiated method declaration.
CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
CXXMethodDecl *Method = 0;
DeclarationName Name = D->getDeclName();
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
Name = SemaRef.Context.DeclarationNames.getCXXConstructorName(
SemaRef.Context.getCanonicalType(ClassTy));
Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
Constructor->getLocation(),
Name, T, TInfo,
Constructor->isExplicit(),
Constructor->isInlineSpecified(),
false);
} else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
QualType ClassTy = SemaRef.Context.getTypeDeclType(Record);
Name = SemaRef.Context.DeclarationNames.getCXXDestructorName(
SemaRef.Context.getCanonicalType(ClassTy));
Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
Destructor->getLocation(), Name,
T, Destructor->isInlineSpecified(),
false);
} else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) {
CanQualType ConvTy
= SemaRef.Context.getCanonicalType(
T->getAs<FunctionType>()->getResultType());
Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName(
ConvTy);
Method = CXXConversionDecl::Create(SemaRef.Context, Record,
Conversion->getLocation(), Name,
T, TInfo,
Conversion->isInlineSpecified(),
Conversion->isExplicit());
} else {
Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(),
D->getDeclName(), T, TInfo,
D->isStatic(),
D->getStorageClassAsWritten(),
D->isInlineSpecified());
}
if (Qualifier)
Method->setQualifierInfo(Qualifier, D->getQualifierRange());
if (TemplateParams) {
// Our resulting instantiation is actually a function template, since we
// are substituting only the outer template parameters. For example, given
//
// template<typename T>
// struct X {
// template<typename U> void f(T, U);
// };
//
// X<int> x;
//
// We are instantiating the member template "f" within X<int>, which means
// substituting int for T, but leaving "f" as a member function template.
// Build the function template itself.
FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record,
Method->getLocation(),
Method->getDeclName(),
TemplateParams, Method);
if (isFriend) {
FunctionTemplate->setLexicalDeclContext(Owner);
FunctionTemplate->setObjectOfFriendDecl(true);
} else if (D->isOutOfLine())
FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
Method->setDescribedFunctionTemplate(FunctionTemplate);
} else if (FunctionTemplate) {
// Record this function template specialization.
Method->setFunctionTemplateSpecialization(FunctionTemplate,
&TemplateArgs.getInnermost(),
InsertPos);
} else if (!isFriend) {
// Record that this is an instantiation of a member function.
Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
}
// If we are instantiating a member function defined
// out-of-line, the instantiation will have the same lexical
// context (which will be a namespace scope) as the template.
if (isFriend) {
Method->setLexicalDeclContext(Owner);
Method->setObjectOfFriendDecl(true);
} else if (D->isOutOfLine())
Method->setLexicalDeclContext(D->getLexicalDeclContext());
// Attach the parameters
for (unsigned P = 0; P < Params.size(); ++P)
Params[P]->setOwningFunction(Method);
Method->setParams(Params.data(), Params.size());
if (InitMethodInstantiation(Method, D))
Method->setInvalidDecl();
LookupResult Previous(SemaRef, Name, SourceLocation(),
Sema::LookupOrdinaryName, Sema::ForRedeclaration);
if (!FunctionTemplate || TemplateParams || isFriend) {
SemaRef.LookupQualifiedName(Previous, Record);
// In C++, the previous declaration we find might be a tag type
// (class or enum). In this case, the new declaration will hide the
// tag type. Note that this does does not apply if we're declaring a
// typedef (C++ [dcl.typedef]p4).
if (Previous.isSingleTagDecl())
Previous.clear();
}
bool Redeclaration = false;
bool OverloadableAttrRequired = false;
SemaRef.CheckFunctionDeclaration(0, Method, Previous, false, Redeclaration,
/*FIXME:*/OverloadableAttrRequired);
if (D->isPure())
SemaRef.CheckPureMethod(Method, SourceRange());
Method->setAccess(D->getAccess());
if (FunctionTemplate) {
// If there's a function template, let our caller handle it.
} else if (Method->isInvalidDecl() && !Previous.empty()) {
// Don't hide a (potentially) valid declaration with an invalid one.
} else {
NamedDecl *DeclToAdd = (TemplateParams
? cast<NamedDecl>(FunctionTemplate)
: Method);
if (isFriend)
Record->makeDeclVisibleInContext(DeclToAdd);
else
Owner->addDecl(DeclToAdd);
}
return Method;
}
Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
return VisitCXXMethodDecl(D);
}
Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
return VisitCXXMethodDecl(D);
}
Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
return VisitCXXMethodDecl(D);
}
ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
return SemaRef.SubstParmVarDecl(D, TemplateArgs);
}
Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
TemplateTypeParmDecl *D) {
// TODO: don't always clone when decls are refcounted.
const Type* T = D->getTypeForDecl();
assert(T->isTemplateTypeParmType());
const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>();
TemplateTypeParmDecl *Inst =
TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
TTPT->getDepth() - 1, TTPT->getIndex(),
TTPT->getName(),
D->wasDeclaredWithTypename(),
D->isParameterPack());
if (D->hasDefaultArgument())
Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false);
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
NonTypeTemplateParmDecl *D) {
// Substitute into the type of the non-type template parameter.
QualType T;
TypeSourceInfo *DI = D->getTypeSourceInfo();
if (DI) {
DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(),
D->getDeclName());
if (DI) T = DI->getType();
} else {
T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(),
D->getDeclName());
DI = 0;
}
if (T.isNull())
return 0;
// Check that this type is acceptable for a non-type template parameter.
bool Invalid = false;
T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation());
if (T.isNull()) {
T = SemaRef.Context.IntTy;
Invalid = true;
}
NonTypeTemplateParmDecl *Param
= NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getDepth() - 1, D->getPosition(),
D->getIdentifier(), T, DI);
if (Invalid)
Param->setInvalidDecl();
Param->setDefaultArgument(D->getDefaultArgument());
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
return Param;
}
Decl *
TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
TemplateTemplateParmDecl *D) {
// Instantiate the template parameter list of the template template parameter.
TemplateParameterList *TempParams = D->getTemplateParameters();
TemplateParameterList *InstParams;
{
// Perform the actual substitution of template parameters within a new,
// local instantiation scope.
Sema::LocalInstantiationScope Scope(SemaRef);
InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return NULL;
}
// Build the template template parameter.
TemplateTemplateParmDecl *Param
= TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getDepth() - 1, D->getPosition(),
D->getIdentifier(), InstParams);
Param->setDefaultArgument(D->getDefaultArgument());
// Introduce this template parameter's instantiation into the instantiation
// scope.
SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
return Param;
}
Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
// Using directives are never dependent, so they require no explicit
UsingDirectiveDecl *Inst
= UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(),
D->getNamespaceKeyLocation(),
D->getQualifierRange(), D->getQualifier(),
D->getIdentLocation(),
D->getNominatedNamespace(),
D->getCommonAncestor());
Owner->addDecl(Inst);
return Inst;
}
Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) {
// The nested name specifier is non-dependent, so no transformation
// is required.
// We only need to do redeclaration lookups if we're in a class
// scope (in fact, it's not really even possible in non-class
// scopes).
bool CheckRedeclaration = Owner->isRecord();
LookupResult Prev(SemaRef, D->getDeclName(), D->getLocation(),
Sema::LookupUsingDeclName, Sema::ForRedeclaration);
UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner,
D->getLocation(),
D->getNestedNameRange(),
D->getUsingLocation(),
D->getTargetNestedNameDecl(),
D->getDeclName(),
D->isTypeName());
CXXScopeSpec SS;
SS.setScopeRep(D->getTargetNestedNameDecl());
SS.setRange(D->getNestedNameRange());
if (CheckRedeclaration) {
Prev.setHideTags(false);
SemaRef.LookupQualifiedName(Prev, Owner);
// Check for invalid redeclarations.
if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(),
D->isTypeName(), SS,
D->getLocation(), Prev))
NewUD->setInvalidDecl();
}
if (!NewUD->isInvalidDecl() &&
SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS,
D->getLocation()))
NewUD->setInvalidDecl();
SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
NewUD->setAccess(D->getAccess());
Owner->addDecl(NewUD);
// Don't process the shadow decls for an invalid decl.
if (NewUD->isInvalidDecl())
return NewUD;
bool isFunctionScope = Owner->isFunctionOrMethod();
// Process the shadow decls.
for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end();
I != E; ++I) {
UsingShadowDecl *Shadow = *I;
NamedDecl *InstTarget =
cast<NamedDecl>(SemaRef.FindInstantiatedDecl(Shadow->getLocation(),
Shadow->getTargetDecl(),
TemplateArgs));
if (CheckRedeclaration &&
SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev))
continue;
UsingShadowDecl *InstShadow
= SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget);
SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow);
if (isFunctionScope)
SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow);
}
return NewUD;
}
Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) {
// Ignore these; we handle them in bulk when processing the UsingDecl.
return 0;
}
Decl * TemplateDeclInstantiator
::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) {
NestedNameSpecifier *NNS =
SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(),
D->getTargetNestedNameRange(),
TemplateArgs);
if (!NNS)
return 0;
CXXScopeSpec SS;
SS.setRange(D->getTargetNestedNameRange());
SS.setScopeRep(NNS);
NamedDecl *UD =
SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
D->getUsingLoc(), SS, D->getLocation(),
D->getDeclName(), 0,
/*instantiation*/ true,
/*typename*/ true, D->getTypenameLoc());
if (UD)
SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
return UD;
}
Decl * TemplateDeclInstantiator
::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
NestedNameSpecifier *NNS =
SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(),
D->getTargetNestedNameRange(),
TemplateArgs);
if (!NNS)
return 0;
CXXScopeSpec SS;
SS.setRange(D->getTargetNestedNameRange());
SS.setScopeRep(NNS);
NamedDecl *UD =
SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(),
D->getUsingLoc(), SS, D->getLocation(),
D->getDeclName(), 0,
/*instantiation*/ true,
/*typename*/ false, SourceLocation());
if (UD)
SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D);
return UD;
}
Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner,
const MultiLevelTemplateArgumentList &TemplateArgs) {
TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs);
if (D->isInvalidDecl())
return 0;
return Instantiator.Visit(D);
}
/// \brief Instantiates a nested template parameter list in the current
/// instantiation context.
///
/// \param L The parameter list to instantiate
///
/// \returns NULL if there was an error
TemplateParameterList *
TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) {
// Get errors for all the parameters before bailing out.
bool Invalid = false;
unsigned N = L->size();
typedef llvm::SmallVector<NamedDecl *, 8> ParamVector;
ParamVector Params;
Params.reserve(N);
for (TemplateParameterList::iterator PI = L->begin(), PE = L->end();
PI != PE; ++PI) {
NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI));
Params.push_back(D);
Invalid = Invalid || !D || D->isInvalidDecl();
}
// Clean up if we had an error.
if (Invalid) {
for (ParamVector::iterator PI = Params.begin(), PE = Params.end();
PI != PE; ++PI)
if (*PI)
(*PI)->Destroy(SemaRef.Context);
return NULL;
}
TemplateParameterList *InstL
= TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(),
L->getLAngleLoc(), &Params.front(), N,
L->getRAngleLoc());
return InstL;
}
/// \brief Instantiate the declaration of a class template partial
/// specialization.
///
/// \param ClassTemplate the (instantiated) class template that is partially
// specialized by the instantiation of \p PartialSpec.
///
/// \param PartialSpec the (uninstantiated) class template partial
/// specialization that we are instantiating.
///
/// \returns true if there was an error, false otherwise.
bool
TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization(
ClassTemplateDecl *ClassTemplate,
ClassTemplatePartialSpecializationDecl *PartialSpec) {
// Create a local instantiation scope for this class template partial
// specialization, which will contain the instantiations of the template
// parameters.
Sema::LocalInstantiationScope Scope(SemaRef);
// Substitute into the template parameters of the class template partial
// specialization.
TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
if (!InstParams)
return true;
// Substitute into the template arguments of the class template partial
// specialization.
const TemplateArgumentLoc *PartialSpecTemplateArgs
= PartialSpec->getTemplateArgsAsWritten();
unsigned N = PartialSpec->getNumTemplateArgsAsWritten();
TemplateArgumentListInfo InstTemplateArgs; // no angle locations
for (unsigned I = 0; I != N; ++I) {
TemplateArgumentLoc Loc;
if (SemaRef.Subst(PartialSpecTemplateArgs[I], Loc, TemplateArgs))
return true;
InstTemplateArgs.addArgument(Loc);
}
// Check that the template argument list is well-formed for this
// class template.
TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(),
InstTemplateArgs.size());
if (SemaRef.CheckTemplateArgumentList(ClassTemplate,
PartialSpec->getLocation(),
InstTemplateArgs,
false,
Converted))
return true;
// Figure out where to insert this class template partial specialization
// in the member template's set of class template partial specializations.
llvm::FoldingSetNodeID ID;
ClassTemplatePartialSpecializationDecl::Profile(ID,
Converted.getFlatArguments(),
Converted.flatSize(),
SemaRef.Context);
void *InsertPos = 0;
ClassTemplateSpecializationDecl *PrevDecl
= ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID,
InsertPos);
// Build the canonical type that describes the converted template
// arguments of the class template partial specialization.
QualType CanonType
= SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
Converted.getFlatArguments(),
Converted.flatSize());
// Build the fully-sugared type for this class template
// specialization as the user wrote in the specialization
// itself. This means that we'll pretty-print the type retrieved
// from the specialization's declaration the way that the user
// actually wrote the specialization, rather than formatting the
// name based on the "canonical" representation used to store the
// template arguments in the specialization.
TypeSourceInfo *WrittenTy
= SemaRef.Context.getTemplateSpecializationTypeInfo(
TemplateName(ClassTemplate),
PartialSpec->getLocation(),
InstTemplateArgs,
CanonType);
if (PrevDecl) {
// We've already seen a partial specialization with the same template
// parameters and template arguments. This can happen, for example, when
// substituting the outer template arguments ends up causing two
// class template partial specializations of a member class template
// to have identical forms, e.g.,
//
// template<typename T, typename U>
// struct Outer {
// template<typename X, typename Y> struct Inner;
// template<typename Y> struct Inner<T, Y>;
// template<typename Y> struct Inner<U, Y>;
// };
//
// Outer<int, int> outer; // error: the partial specializations of Inner
// // have the same signature.
SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared)
<< WrittenTy;
SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here)
<< SemaRef.Context.getTypeDeclType(PrevDecl);
return true;
}
// Create the class template partial specialization declaration.
ClassTemplatePartialSpecializationDecl *InstPartialSpec
= ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, Owner,
PartialSpec->getLocation(),
InstParams,
ClassTemplate,
Converted,
InstTemplateArgs,
CanonType,
0,
ClassTemplate->getPartialSpecializations().size());
// Substitute the nested name specifier, if any.
if (SubstQualifier(PartialSpec, InstPartialSpec))
return 0;
InstPartialSpec->setInstantiatedFromMember(PartialSpec);
InstPartialSpec->setTypeAsWritten(WrittenTy);
// Add this partial specialization to the set of class template partial
// specializations.
ClassTemplate->getPartialSpecializations().InsertNode(InstPartialSpec,
InsertPos);
return false;
}
TypeSourceInfo*
TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D,
llvm::SmallVectorImpl<ParmVarDecl *> &Params) {
TypeSourceInfo *OldTInfo = D->getTypeSourceInfo();
assert(OldTInfo && "substituting function without type source info");
assert(Params.empty() && "parameter vector is non-empty at start");
TypeSourceInfo *NewTInfo
= SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs,
D->getTypeSpecStartLoc(),
D->getDeclName());
if (!NewTInfo)
return 0;
if (NewTInfo != OldTInfo) {
// Get parameters from the new type info.
TypeLoc OldTL = OldTInfo->getTypeLoc();
FunctionProtoTypeLoc *OldProtoLoc = cast<FunctionProtoTypeLoc>(&OldTL);
TypeLoc NewTL = NewTInfo->getTypeLoc();
FunctionProtoTypeLoc *NewProtoLoc = cast<FunctionProtoTypeLoc>(&NewTL);
assert(NewProtoLoc && "Missing prototype?");
for (unsigned i = 0, i_end = NewProtoLoc->getNumArgs(); i != i_end; ++i) {
// FIXME: Variadic templates will break this.
Params.push_back(NewProtoLoc->getArg(i));
SemaRef.CurrentInstantiationScope->InstantiatedLocal(
OldProtoLoc->getArg(i),
NewProtoLoc->getArg(i));
}
} else {
// The function type itself was not dependent and therefore no
// substitution occurred. However, we still need to instantiate
// the function parameters themselves.
TypeLoc OldTL = OldTInfo->getTypeLoc();
FunctionProtoTypeLoc *OldProtoLoc = cast<FunctionProtoTypeLoc>(&OldTL);
for (unsigned i = 0, i_end = OldProtoLoc->getNumArgs(); i != i_end; ++i) {
ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc->getArg(i));
if (!Parm)
return 0;
Params.push_back(Parm);
}
}
return NewTInfo;
}
/// \brief Initializes the common fields of an instantiation function
/// declaration (New) from the corresponding fields of its template (Tmpl).
///
/// \returns true if there was an error
bool
TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
FunctionDecl *Tmpl) {
if (Tmpl->isDeleted())
New->setDeleted();
// If we are performing substituting explicitly-specified template arguments
// or deduced template arguments into a function template and we reach this
// point, we are now past the point where SFINAE applies and have committed
// to keeping the new function template specialization. We therefore
// convert the active template instantiation for the function template
// into a template instantiation for this specific function template
// specialization, which is not a SFINAE context, so that we diagnose any
// further errors in the declaration itself.
typedef Sema::ActiveTemplateInstantiation ActiveInstType;
ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back();
if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution ||
ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) {
if (FunctionTemplateDecl *FunTmpl
= dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) {
assert(FunTmpl->getTemplatedDecl() == Tmpl &&
"Deduction from the wrong function template?");
(void) FunTmpl;
ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
ActiveInst.Entity = reinterpret_cast<uintptr_t>(New);
--SemaRef.NonInstantiationEntries;
}
}
const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
assert(Proto && "Function template without prototype?");
if (Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec() ||
Proto->getNoReturnAttr()) {
// The function has an exception specification or a "noreturn"
// attribute. Substitute into each of the exception types.
llvm::SmallVector<QualType, 4> Exceptions;
for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) {
// FIXME: Poor location information!
QualType T
= SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs,
New->getLocation(), New->getDeclName());
if (T.isNull() ||
SemaRef.CheckSpecifiedExceptionType(T, New->getLocation()))
continue;
Exceptions.push_back(T);
}
// Rebuild the function type
const FunctionProtoType *NewProto
= New->getType()->getAs<FunctionProtoType>();
assert(NewProto && "Template instantiation without function prototype?");
New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(),
NewProto->arg_type_begin(),
NewProto->getNumArgs(),
NewProto->isVariadic(),
NewProto->getTypeQuals(),
Proto->hasExceptionSpec(),
Proto->hasAnyExceptionSpec(),
Exceptions.size(),
Exceptions.data(),
Proto->getExtInfo()));
}
return false;
}
/// \brief Initializes common fields of an instantiated method
/// declaration (New) from the corresponding fields of its template
/// (Tmpl).
///
/// \returns true if there was an error
bool
TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
CXXMethodDecl *Tmpl) {
if (InitFunctionInstantiation(New, Tmpl))
return true;
CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner);
New->setAccess(Tmpl->getAccess());
if (Tmpl->isVirtualAsWritten())
Record->setMethodAsVirtual(New);
// FIXME: attributes
// FIXME: New needs a pointer to Tmpl
return false;
}
/// \brief Instantiate the definition of the given function from its
/// template.
///
/// \param PointOfInstantiation the point at which the instantiation was
/// required. Note that this is not precisely a "point of instantiation"
/// for the function, but it's close.
///
/// \param Function the already-instantiated declaration of a
/// function template specialization or member function of a class template
/// specialization.
///
/// \param Recursive if true, recursively instantiates any functions that
/// are required by this instantiation.
///
/// \param DefinitionRequired if true, then we are performing an explicit
/// instantiation where the body of the function is required. Complain if
/// there is no such body.
void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
FunctionDecl *Function,
bool Recursive,
bool DefinitionRequired) {
if (Function->isInvalidDecl())
return;
assert(!Function->getBody() && "Already instantiated!");
// Never instantiate an explicit specialization.
if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
return;
// Find the function body that we'll be substituting.
const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern();
Stmt *Pattern = 0;
if (PatternDecl)
Pattern = PatternDecl->getBody(PatternDecl);
if (!Pattern) {
if (DefinitionRequired) {
if (Function->getPrimaryTemplate())
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_func_template)
<< Function->getPrimaryTemplate();
else
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_member)
<< 1 << Function->getDeclName() << Function->getDeclContext();
if (PatternDecl)
Diag(PatternDecl->getLocation(),
diag::note_explicit_instantiation_here);
}
return;
}
// C++0x [temp.explicit]p9:
// Except for inline functions, other explicit instantiation declarations
// have the effect of suppressing the implicit instantiation of the entity
// to which they refer.
if (Function->getTemplateSpecializationKind()
== TSK_ExplicitInstantiationDeclaration &&
!PatternDecl->isInlined())
return;
InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
if (Inst)
return;
// 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.
std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
if (Recursive)
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function));
// Introduce a new scope where local variable instantiations will be
// recorded, unless we're actually a member function within a local
// class, in which case we need to merge our results with the parent
// scope (of the enclosing function).
bool MergeWithParentScope = false;
if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext()))
MergeWithParentScope = Rec->isLocalClass();
LocalInstantiationScope Scope(*this, MergeWithParentScope);
// Introduce the instantiated function parameters into the local
// instantiation scope.
for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I)
Scope.InstantiatedLocal(PatternDecl->getParamDecl(I),
Function->getParamDecl(I));
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
DeclContext *PreviousContext = CurContext;
CurContext = Function;
MultiLevelTemplateArgumentList TemplateArgs =
getTemplateInstantiationArgs(Function);
// If this is a constructor, instantiate the member initializers.
if (const CXXConstructorDecl *Ctor =
dyn_cast<CXXConstructorDecl>(PatternDecl)) {
InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor,
TemplateArgs);
}
// Instantiate the function body.
OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs);
if (Body.isInvalid())
Function->setInvalidDecl();
ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body),
/*IsInstantiation=*/true);
PerformDependentDiagnostics(PatternDecl, TemplateArgs);
CurContext = PreviousContext;
DeclGroupRef DG(Function);
Consumer.HandleTopLevelDecl(DG);
// This class may have local implicit instantiations that need to be
// instantiation within this scope.
PerformPendingImplicitInstantiations(/*LocalOnly=*/true);
Scope.Exit();
if (Recursive) {
// Instantiate any pending implicit instantiations found during the
// instantiation of this template.
PerformPendingImplicitInstantiations();
// Restore the set of pending implicit instantiations.
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
}
}
/// \brief Instantiate the definition of the given variable from its
/// template.
///
/// \param PointOfInstantiation the point at which the instantiation was
/// required. Note that this is not precisely a "point of instantiation"
/// for the function, but it's close.
///
/// \param Var the already-instantiated declaration of a static member
/// variable of a class template specialization.
///
/// \param Recursive if true, recursively instantiates any functions that
/// are required by this instantiation.
///
/// \param DefinitionRequired if true, then we are performing an explicit
/// instantiation where an out-of-line definition of the member variable
/// is required. Complain if there is no such definition.
void Sema::InstantiateStaticDataMemberDefinition(
SourceLocation PointOfInstantiation,
VarDecl *Var,
bool Recursive,
bool DefinitionRequired) {
if (Var->isInvalidDecl())
return;
// Find the out-of-line definition of this static data member.
VarDecl *Def = Var->getInstantiatedFromStaticDataMember();
assert(Def && "This data member was not instantiated from a template?");
assert(Def->isStaticDataMember() && "Not a static data member?");
Def = Def->getOutOfLineDefinition();
if (!Def) {
// We did not find an out-of-line definition of this static data member,
// so 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 (DefinitionRequired) {
Def = Var->getInstantiatedFromStaticDataMember();
Diag(PointOfInstantiation,
diag::err_explicit_instantiation_undefined_member)
<< 2 << Var->getDeclName() << Var->getDeclContext();
Diag(Def->getLocation(), diag::note_explicit_instantiation_here);
}
return;
}
// Never instantiate an explicit specialization.
if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
return;
// C++0x [temp.explicit]p9:
// Except for inline functions, other explicit instantiation declarations
// have the effect of suppressing the implicit instantiation of the entity
// to which they refer.
if (Var->getTemplateSpecializationKind()
== TSK_ExplicitInstantiationDeclaration)
return;
InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
if (Inst)
return;
// 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.
std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations;
if (Recursive)
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
// Enter the scope of this instantiation. We don't use
// PushDeclContext because we don't have a scope.
DeclContext *PreviousContext = CurContext;
CurContext = Var->getDeclContext();
VarDecl *OldVar = Var;
Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(),
getTemplateInstantiationArgs(Var)));
CurContext = PreviousContext;
if (Var) {
MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo();
assert(MSInfo && "Missing member specialization information?");
Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(),
MSInfo->getPointOfInstantiation());
DeclGroupRef DG(Var);
Consumer.HandleTopLevelDecl(DG);
}
if (Recursive) {
// Instantiate any pending implicit instantiations found during the
// instantiation of this template.
PerformPendingImplicitInstantiations();
// Restore the set of pending implicit instantiations.
PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations);
}
}
void
Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
const CXXConstructorDecl *Tmpl,
const MultiLevelTemplateArgumentList &TemplateArgs) {
llvm::SmallVector<MemInitTy*, 4> NewInits;
bool AnyErrors = false;
// Instantiate all the initializers.
for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(),
InitsEnd = Tmpl->init_end();
Inits != InitsEnd; ++Inits) {
CXXBaseOrMemberInitializer *Init = *Inits;
SourceLocation LParenLoc, RParenLoc;
ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this);
llvm::SmallVector<SourceLocation, 4> CommaLocs;
// Instantiate the initializer.
if (InstantiateInitializer(*this, Init->getInit(), TemplateArgs,
LParenLoc, CommaLocs, NewArgs, RParenLoc)) {
AnyErrors = true;
continue;
}
MemInitResult NewInit;
if (Init->isBaseInitializer()) {
TypeSourceInfo *BaseTInfo = SubstType(Init->getBaseClassInfo(),
TemplateArgs,
Init->getSourceLocation(),
New->getDeclName());
if (!BaseTInfo) {
AnyErrors = true;
New->setInvalidDecl();
continue;
}
NewInit = BuildBaseInitializer(BaseTInfo->getType(), BaseTInfo,
(Expr **)NewArgs.data(),
NewArgs.size(),
Init->getLParenLoc(),
Init->getRParenLoc(),
New->getParent());
} else if (Init->isMemberInitializer()) {
FieldDecl *Member;
// Is this an anonymous union?
if (FieldDecl *UnionInit = Init->getAnonUnionMember())
Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMemberLocation(),
UnionInit, TemplateArgs));
else
Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMemberLocation(),
Init->getMember(),
TemplateArgs));
NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(),
NewArgs.size(),
Init->getSourceLocation(),
Init->getLParenLoc(),
Init->getRParenLoc());
}
if (NewInit.isInvalid()) {
AnyErrors = true;
New->setInvalidDecl();
} else {
// FIXME: It would be nice if ASTOwningVector had a release function.
NewArgs.take();
NewInits.push_back((MemInitTy *)NewInit.get());
}
}
// Assign all the initializers to the new constructor.
ActOnMemInitializers(DeclPtrTy::make(New),
/*FIXME: ColonLoc */
SourceLocation(),
NewInits.data(), NewInits.size(),
AnyErrors);
}
// TODO: this could be templated if the various decl types used the
// same method name.
static bool isInstantiationOf(ClassTemplateDecl *Pattern,
ClassTemplateDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberTemplate();
} while (Instance);
return false;
}
static bool isInstantiationOf(FunctionTemplateDecl *Pattern,
FunctionTemplateDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberTemplate();
} while (Instance);
return false;
}
static bool
isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern,
ClassTemplatePartialSpecializationDecl *Instance) {
Pattern
= cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl());
do {
Instance = cast<ClassTemplatePartialSpecializationDecl>(
Instance->getCanonicalDecl());
if (Pattern == Instance)
return true;
Instance = Instance->getInstantiatedFromMember();
} while (Instance);
return false;
}
static bool isInstantiationOf(CXXRecordDecl *Pattern,
CXXRecordDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberClass();
} while (Instance);
return false;
}
static bool isInstantiationOf(FunctionDecl *Pattern,
FunctionDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberFunction();
} while (Instance);
return false;
}
static bool isInstantiationOf(EnumDecl *Pattern,
EnumDecl *Instance) {
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromMemberEnum();
} while (Instance);
return false;
}
static bool isInstantiationOf(UsingShadowDecl *Pattern,
UsingShadowDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern;
}
static bool isInstantiationOf(UsingDecl *Pattern,
UsingDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
}
static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern,
UsingDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
}
static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern,
UsingDecl *Instance,
ASTContext &C) {
return C.getInstantiatedFromUsingDecl(Instance) == Pattern;
}
static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
VarDecl *Instance) {
assert(Instance->isStaticDataMember());
Pattern = Pattern->getCanonicalDecl();
do {
Instance = Instance->getCanonicalDecl();
if (Pattern == Instance) return true;
Instance = Instance->getInstantiatedFromStaticDataMember();
} while (Instance);
return false;
}
// Other is the prospective instantiation
// D is the prospective pattern
static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
if (D->getKind() != Other->getKind()) {
if (UnresolvedUsingTypenameDecl *UUD
= dyn_cast<UnresolvedUsingTypenameDecl>(D)) {
if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
return isInstantiationOf(UUD, UD, Ctx);
}
}
if (UnresolvedUsingValueDecl *UUD
= dyn_cast<UnresolvedUsingValueDecl>(D)) {
if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) {
return isInstantiationOf(UUD, UD, Ctx);
}
}
return false;
}
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other))
return isInstantiationOf(cast<CXXRecordDecl>(D), Record);
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other))
return isInstantiationOf(cast<FunctionDecl>(D), Function);
if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other))
return isInstantiationOf(cast<EnumDecl>(D), Enum);
if (VarDecl *Var = dyn_cast<VarDecl>(Other))
if (Var->isStaticDataMember())
return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var);
if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other))
return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp);
if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other))
return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp);
if (ClassTemplatePartialSpecializationDecl *PartialSpec
= dyn_cast<ClassTemplatePartialSpecializationDecl>(Other))
return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D),
PartialSpec);
if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) {
if (!Field->getDeclName()) {
// This is an unnamed field.
return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) ==
cast<FieldDecl>(D);
}
}
if (UsingDecl *Using = dyn_cast<UsingDecl>(Other))
return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx);
if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other))
return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx);
return D->getDeclName() && isa<NamedDecl>(Other) &&
D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
}
template<typename ForwardIterator>
static NamedDecl *findInstantiationOf(ASTContext &Ctx,
NamedDecl *D,
ForwardIterator first,
ForwardIterator last) {
for (; first != last; ++first)
if (isInstantiationOf(Ctx, D, *first))
return cast<NamedDecl>(*first);
return 0;
}
/// \brief Finds the instantiation of the given declaration context
/// within the current instantiation.
///
/// \returns NULL if there was an error
DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC,
const MultiLevelTemplateArgumentList &TemplateArgs) {
if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) {
Decl* ID = FindInstantiatedDecl(Loc, D, TemplateArgs);
return cast_or_null<DeclContext>(ID);
} else return DC;
}
/// \brief Find the instantiation of the given declaration within the
/// current instantiation.
///
/// This routine is intended to be used when \p D is a declaration
/// referenced from within a template, that needs to mapped into the
/// corresponding declaration within an instantiation. For example,
/// given:
///
/// \code
/// template<typename T>
/// struct X {
/// enum Kind {
/// KnownValue = sizeof(T)
/// };
///
/// bool getKind() const { return KnownValue; }
/// };
///
/// template struct X<int>;
/// \endcode
///
/// In the instantiation of X<int>::getKind(), we need to map the
/// EnumConstantDecl for KnownValue (which refers to
/// X<T>::<Kind>::KnownValue) to its instantiation
/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs
/// this mapping from within the instantiation of X<int>.
NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
const MultiLevelTemplateArgumentList &TemplateArgs) {
DeclContext *ParentDC = D->getDeclContext();
if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) ||
isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) ||
ParentDC->isFunctionOrMethod()) {
// D is a local of some kind. Look into the map of local
// declarations to their instantiations.
return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D));
}
if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
if (!Record->isDependentContext())
return D;
// If the RecordDecl is actually the injected-class-name or a
// "templated" declaration for a class template, class template
// partial specialization, or a member class of a class template,
// substitute into the injected-class-name of the class template
// or partial specialization to find the new DeclContext.
QualType T;
ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate();
if (ClassTemplate) {
T = ClassTemplate->getInjectedClassNameSpecialization(Context);
} else if (ClassTemplatePartialSpecializationDecl *PartialSpec
= dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) {
ClassTemplate = PartialSpec->getSpecializedTemplate();
// If we call SubstType with an InjectedClassNameType here we
// can end up in an infinite loop.
T = Context.getTypeDeclType(Record);
assert(isa<InjectedClassNameType>(T) &&
"type of partial specialization is not an InjectedClassNameType");
T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType();
}
if (!T.isNull()) {
// Substitute into the injected-class-name to get the type
// corresponding to the instantiation we want, which may also be
// the current instantiation (if we're in a template
// definition). This substitution should never fail, since we
// know we can instantiate the injected-class-name or we
// wouldn't have gotten to the injected-class-name!
// FIXME: Can we use the CurrentInstantiationScope to avoid this
// extra instantiation in the common case?
T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName());
assert(!T.isNull() && "Instantiation of injected-class-name cannot fail.");
if (!T->isDependentType()) {
assert(T->isRecordType() && "Instantiation must produce a record type");
return T->getAs<RecordType>()->getDecl();
}
// We are performing "partial" template instantiation to create
// the member declarations for the members of a class template
// specialization. Therefore, D is actually referring to something
// in the current instantiation. Look through the current
// context, which contains actual instantiations, to find the
// instantiation of the "current instantiation" that D refers
// to.
bool SawNonDependentContext = false;
for (DeclContext *DC = CurContext; !DC->isFileContext();
DC = DC->getParent()) {
if (ClassTemplateSpecializationDecl *Spec
= dyn_cast<ClassTemplateSpecializationDecl>(DC))
if (isInstantiationOf(ClassTemplate,
Spec->getSpecializedTemplate()))
return Spec;
if (!DC->isDependentContext())
SawNonDependentContext = true;
}
// We're performing "instantiation" of a member of the current
// instantiation while we are type-checking the
// definition. Compute the declaration context and return that.
assert(!SawNonDependentContext &&
"No dependent context while instantiating record");
DeclContext *DC = computeDeclContext(T);
assert(DC &&
"Unable to find declaration for the current instantiation");
return cast<CXXRecordDecl>(DC);
}
// Fall through to deal with other dependent record types (e.g.,
// anonymous unions in class templates).
}
if (!ParentDC->isDependentContext())
return D;
ParentDC = FindInstantiatedContext(Loc, ParentDC, TemplateArgs);
if (!ParentDC)
return 0;
if (ParentDC != D->getDeclContext()) {
// We performed some kind of instantiation in the parent context,
// so now we need to look into the instantiated parent context to
// find the instantiation of the declaration D.
// If our context used to be dependent, we may need to instantiate
// it before performing lookup into that context.
if (CXXRecordDecl *Spec = dyn_cast<CXXRecordDecl>(ParentDC)) {
if (!Spec->isDependentContext()) {
QualType T = Context.getTypeDeclType(Spec);
const RecordType *Tag = T->getAs<RecordType>();
assert(Tag && "type of non-dependent record is not a RecordType");
if (!Tag->isBeingDefined() &&
RequireCompleteType(Loc, T, diag::err_incomplete_type))
return 0;
}
}
NamedDecl *Result = 0;
if (D->getDeclName()) {
DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName());
Result = findInstantiationOf(Context, D, Found.first, Found.second);
} else {
// Since we don't have a name for the entity we're looking for,
// our only option is to walk through all of the declarations to
// find that name. This will occur in a few cases:
//
// - anonymous struct/union within a template
// - unnamed class/struct/union/enum within a template
//
// FIXME: Find a better way to find these instantiations!
Result = findInstantiationOf(Context, D,
ParentDC->decls_begin(),
ParentDC->decls_end());
}
// UsingShadowDecls can instantiate to nothing because of using hiding.
assert((Result || isa<UsingShadowDecl>(D) || D->isInvalidDecl() ||
cast<Decl>(ParentDC)->isInvalidDecl())
&& "Unable to find instantiation of declaration!");
D = Result;
}
return D;
}
/// \brief Performs template instantiation for all implicit template
/// instantiations we have seen until this point.
void Sema::PerformPendingImplicitInstantiations(bool LocalOnly) {
while (!PendingLocalImplicitInstantiations.empty() ||
(!LocalOnly && !PendingImplicitInstantiations.empty())) {
PendingImplicitInstantiation Inst;
if (PendingLocalImplicitInstantiations.empty()) {
Inst = PendingImplicitInstantiations.front();
PendingImplicitInstantiations.pop_front();
} else {
Inst = PendingLocalImplicitInstantiations.front();
PendingLocalImplicitInstantiations.pop_front();
}
// Instantiate function definitions
if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) {
PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function),
Function->getLocation(), *this,
Context.getSourceManager(),
"instantiating function definition");
if (!Function->getBody())
InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true);
continue;
}
// Instantiate static data member definitions.
VarDecl *Var = cast<VarDecl>(Inst.first);
assert(Var->isStaticDataMember() && "Not a static data member?");
// Don't try to instantiate declarations if the most recent redeclaration
// is invalid.
if (Var->getMostRecentDeclaration()->isInvalidDecl())
continue;
// Check if the most recent declaration has changed the specialization kind
// and removed the need for implicit instantiation.
switch (Var->getMostRecentDeclaration()->getTemplateSpecializationKind()) {
case TSK_Undeclared:
assert(false && "Cannot instantitiate an undeclared specialization.");
case TSK_ExplicitInstantiationDeclaration:
case TSK_ExplicitInstantiationDefinition:
case TSK_ExplicitSpecialization:
continue; // No longer need implicit instantiation.
case TSK_ImplicitInstantiation:
break;
}
PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var),
Var->getLocation(), *this,
Context.getSourceManager(),
"instantiating static data member "
"definition");
InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true);
}
}
void Sema::PerformDependentDiagnostics(const DeclContext *Pattern,
const MultiLevelTemplateArgumentList &TemplateArgs) {
for (DeclContext::ddiag_iterator I = Pattern->ddiag_begin(),
E = Pattern->ddiag_end(); I != E; ++I) {
DependentDiagnostic *DD = *I;
switch (DD->getKind()) {
case DependentDiagnostic::Access:
HandleDependentAccessCheck(*DD, TemplateArgs);
break;
}
}
}
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