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//===------- SemaTemplateVariadic.cpp - C++ Variadic Templates ------------===/
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===/
//
// This file implements semantic analysis for C++0x variadic templates.
//===----------------------------------------------------------------------===/
#include "clang/Sema/Sema.h"
#include "clang/Sema/SemaInternal.h"
#include "clang/AST/Expr.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/TypeLoc.h"
using namespace clang;
//----------------------------------------------------------------------------
// Visitor that collects unexpanded parameter packs
//----------------------------------------------------------------------------
// FIXME: No way to easily map from TemplateTypeParmTypes to
// TemplateTypeParmDecls, so we have this horrible PointerUnion.
typedef std::pair<llvm::PointerUnion<const TemplateTypeParmType*, NamedDecl*>,
SourceLocation> UnexpandedParameterPack;
namespace {
/// \brief A class that collects unexpanded parameter packs.
class CollectUnexpandedParameterPacksVisitor :
public RecursiveASTVisitor<CollectUnexpandedParameterPacksVisitor>
{
typedef RecursiveASTVisitor<CollectUnexpandedParameterPacksVisitor>
inherited;
llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded;
public:
explicit CollectUnexpandedParameterPacksVisitor(
llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded)
: Unexpanded(Unexpanded) { }
//------------------------------------------------------------------------
// Recording occurrences of (unexpanded) parameter packs.
//------------------------------------------------------------------------
/// \brief Record occurrences of template type parameter packs.
bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
if (TL.getTypePtr()->isParameterPack())
Unexpanded.push_back(std::make_pair(TL.getTypePtr(), TL.getNameLoc()));
return true;
}
/// \brief Record occurrences of template type parameter packs
/// when we don't have proper source-location information for
/// them.
///
/// Ideally, this routine would never be used.
bool VisitTemplateTypeParmType(TemplateTypeParmType *T) {
if (T->isParameterPack())
Unexpanded.push_back(std::make_pair(T, SourceLocation()));
return true;
}
// FIXME: Record occurrences of non-type and template template
// parameter packs.
// FIXME: Once we have pack expansions in the AST, block their
// traversal.
//------------------------------------------------------------------------
// Pruning the search for unexpanded parameter packs.
//------------------------------------------------------------------------
/// \brief Suppress traversal into statements and expressions that
/// do not contain unexpanded parameter packs.
bool TraverseStmt(Stmt *S) {
if (Expr *E = dyn_cast_or_null<Expr>(S))
if (E->containsUnexpandedParameterPack())
return inherited::TraverseStmt(E);
return true;
}
/// \brief Suppress traversal into types that do not contain
/// unexpanded parameter packs.
bool TraverseType(QualType T) {
if (!T.isNull() && T->containsUnexpandedParameterPack())
return inherited::TraverseType(T);
return true;
}
/// \brief Suppress traversel into types with location information
/// that do not contain unexpanded parameter packs.
bool TraverseTypeLoc(TypeLoc TL) {
if (!TL.getType().isNull() && TL.
getType()->containsUnexpandedParameterPack())
return inherited::TraverseTypeLoc(TL);
return true;
}
/// \brief Suppress traversal of non-parameter declarations, since
/// they cannot contain unexpanded parameter packs.
bool TraverseDecl(Decl *D) {
if (D && isa<ParmVarDecl>(D))
return inherited::TraverseDecl(D);
return true;
}
};
}
/// \brief Diagnose all of the unexpanded parameter packs in the given
/// vector.
static void
DiagnoseUnexpandedParameterPacks(Sema &S, SourceLocation Loc,
Sema::UnexpandedParameterPackContext UPPC,
const llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) {
llvm::SmallVector<SourceLocation, 4> Locations;
llvm::SmallVector<IdentifierInfo *, 4> Names;
llvm::SmallPtrSet<IdentifierInfo *, 4> NamesKnown;
for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) {
IdentifierInfo *Name = 0;
if (const TemplateTypeParmType *TTP
= Unexpanded[I].first.dyn_cast<const TemplateTypeParmType *>())
Name = TTP->getName();
else
Name = Unexpanded[I].first.get<NamedDecl *>()->getIdentifier();
if (Name && NamesKnown.insert(Name))
Names.push_back(Name);
if (Unexpanded[I].second.isValid())
Locations.push_back(Unexpanded[I].second);
}
DiagnosticBuilder DB
= Names.size() == 0? S.Diag(Loc, diag::err_unexpanded_parameter_pack_0)
<< (int)UPPC
: Names.size() == 1? S.Diag(Loc, diag::err_unexpanded_parameter_pack_1)
<< (int)UPPC << Names[0]
: Names.size() == 2? S.Diag(Loc, diag::err_unexpanded_parameter_pack_2)
<< (int)UPPC << Names[0] << Names[1]
: S.Diag(Loc, diag::err_unexpanded_parameter_pack_3_or_more)
<< (int)UPPC << Names[0] << Names[1];
for (unsigned I = 0, N = Locations.size(); I != N; ++I)
DB << SourceRange(Locations[I]);
}
bool Sema::DiagnoseUnexpandedParameterPack(SourceLocation Loc,
TypeSourceInfo *T,
UnexpandedParameterPackContext UPPC) {
// C++0x [temp.variadic]p5:
// An appearance of a name of a parameter pack that is not expanded is
// ill-formed.
if (!T->getType()->containsUnexpandedParameterPack())
return false;
llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded;
CollectUnexpandedParameterPacksVisitor(Unexpanded).TraverseTypeLoc(
T->getTypeLoc());
assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs");
DiagnoseUnexpandedParameterPacks(*this, Loc, UPPC, Unexpanded);
return true;
}
bool Sema::DiagnoseUnexpandedParameterPack(Expr *E,
UnexpandedParameterPackContext UPPC) {
// C++0x [temp.variadic]p5:
// An appearance of a name of a parameter pack that is not expanded is
// ill-formed.
if (!E->containsUnexpandedParameterPack())
return false;
llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded;
CollectUnexpandedParameterPacksVisitor(Unexpanded).TraverseStmt(E);
assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs");
DiagnoseUnexpandedParameterPacks(*this, E->getLocStart(), UPPC, Unexpanded);
return true;
}
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