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[c++1z] Use canonical expression equivalence to determine whether two different 

dependent noexcept specifications result in the same canonical function type.

We still use non-canonical hashing when deduplicating type sugar so that
diagnostics will point to the right place.

llvm-svn: 284457
This commit is contained in:
Richard Smith 2016-10-18 06:47:03 +00:00
parent 156f6cafc2
commit 99677afd54
4 changed files with 29 additions and 15 deletions
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3
clang/include/clang/AST/Type.h
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@ -3473,7 +3473,8 @@ public:
void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx);
static void Profile(llvm::FoldingSetNodeID &ID, QualType Result,
param_type_iterator ArgTys, unsigned NumArgs,
const ExtProtoInfo &EPI, const ASTContext &Context);
const ExtProtoInfo &EPI, const ASTContext &Context,
bool Canonical);
};
/// \brief Represents the dependent type named by a dependently-scoped

22
clang/lib/AST/ASTContext.cpp
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@ -3170,17 +3170,6 @@ ASTContext::getFunctionType(QualType ResultTy, ArrayRef<QualType> ArgArray,
const FunctionProtoType::ExtProtoInfo &EPI) const {
size_t NumArgs = ArgArray.size();
// Unique functions, to guarantee there is only one function of a particular
// structure.
llvm::FoldingSetNodeID ID;
FunctionProtoType::Profile(ID, ResultTy, ArgArray.begin(), NumArgs, EPI,
*this);
void *InsertPos = nullptr;
if (FunctionProtoType *FTP =
FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(FTP, 0);
bool NoexceptInType = getLangOpts().CPlusPlus1z;
bool IsCanonicalExceptionSpec =
@ -3193,6 +3182,17 @@ ASTContext::getFunctionType(QualType ResultTy, ArrayRef<QualType> ArgArray,
if (!ArgArray[i].isCanonicalAsParam())
isCanonical = false;
// Unique functions, to guarantee there is only one function of a particular
// structure.
llvm::FoldingSetNodeID ID;
FunctionProtoType::Profile(ID, ResultTy, ArgArray.begin(), NumArgs, EPI,
*this, isCanonical);
void *InsertPos = nullptr;
if (FunctionProtoType *FTP =
FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos))
return QualType(FTP, 0);
// If this type isn't canonical, get the canonical version of it.
// The exception spec is not part of the canonical type.
QualType Canonical;

6
clang/lib/AST/Type.cpp
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@ -2850,7 +2850,7 @@ bool FunctionProtoType::isTemplateVariadic() const {
void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result,
const QualType *ArgTys, unsigned NumParams,
const ExtProtoInfo &epi,
const ASTContext &Context) {
const ASTContext &Context, bool Canonical) {
// We have to be careful not to get ambiguous profile encodings.
// Note that valid type pointers are never ambiguous with anything else.
@ -2889,7 +2889,7 @@ void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result,
ID.AddPointer(Ex.getAsOpaquePtr());
} else if (epi.ExceptionSpec.Type == EST_ComputedNoexcept &&
epi.ExceptionSpec.NoexceptExpr) {
epi.ExceptionSpec.NoexceptExpr->Profile(ID, Context, false);
epi.ExceptionSpec.NoexceptExpr->Profile(ID, Context, Canonical);
} else if (epi.ExceptionSpec.Type == EST_Uninstantiated ||
epi.ExceptionSpec.Type == EST_Unevaluated) {
ID.AddPointer(epi.ExceptionSpec.SourceDecl->getCanonicalDecl());
@ -2905,7 +2905,7 @@ void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result,
void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID,
const ASTContext &Ctx) {
Profile(ID, getReturnType(), param_type_begin(), NumParams, getExtProtoInfo(),
Ctx);
Ctx, isCanonicalUnqualified());
}
QualType TypedefType::desugar() const {

13
clang/test/SemaCXX/cxx1z-noexcept-function-type.cpp Normal file
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@ -0,0 +1,13 @@
// RUN: %clang_cc1 -std=c++1z -verify %s
template<typename T> void redecl1() noexcept(noexcept(T())) {} // expected-note {{previous}}
template<typename T> void redecl1() noexcept(noexcept(T())); // ok, same type
template<typename T> void redecl1() noexcept(noexcept(T())) {} // expected-error {{redefinition}}
template<bool A, bool B> void redecl2() noexcept(A); // expected-note {{previous}}
template<bool A, bool B> void redecl2() noexcept(B); // expected-error {{conflicting types}}
// These have the same canonical type.
// FIXME: It's not clear whether this is supposed to be valid.
template<typename A, typename B> void redecl3() throw(A);
template<typename A, typename B> void redecl3() throw(B);