From 13bffc532bafd45d4a77867993c1afb83c7661be Mon Sep 17 00:00:00 2001 From: Richard Smith Date: Thu, 19 Apr 2012 00:08:28 +0000 Subject: [PATCH] PR 12586: Fix assert while running libc++ testsuite: deal with exception specifications on member function templates of class templates and other such nested beasties. Store the function template from which we are to instantiate an exception specification rather than trying to deduce it. Plus some additional test cases. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155076 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/clang/AST/Type.h | 26 +++++++-- lib/AST/ASTContext.cpp | 2 +- lib/AST/Type.cpp | 3 +- lib/Sema/SemaExpr.cpp | 5 +- lib/Sema/SemaTemplateInstantiateDecl.cpp | 31 +++++----- test/CodeGenCXX/cxx11-exception-spec.cpp | 56 ++++++++++++++++++- .../instantiate-exception-spec-cxx11.cpp | 17 +++++- 7 files changed, 110 insertions(+), 30 deletions(-) diff --git a/include/clang/AST/Type.h b/include/clang/AST/Type.h index 9fd4901672..7b615c19dc 100644 --- a/include/clang/AST/Type.h +++ b/include/clang/AST/Type.h @@ -2701,7 +2701,8 @@ public: ExtProtoInfo() : Variadic(false), HasTrailingReturn(false), TypeQuals(0), ExceptionSpecType(EST_None), RefQualifier(RQ_None), - NumExceptions(0), Exceptions(0), NoexceptExpr(0), ExceptionSpecDecl(0), + NumExceptions(0), Exceptions(0), NoexceptExpr(0), + ExceptionSpecDecl(0), ExceptionSpecTemplate(0), ConsumedArguments(0) {} FunctionType::ExtInfo ExtInfo; @@ -2714,6 +2715,7 @@ public: const QualType *Exceptions; Expr *NoexceptExpr; FunctionDecl *ExceptionSpecDecl; + FunctionDecl *ExceptionSpecTemplate; const bool *ConsumedArguments; }; @@ -2759,9 +2761,10 @@ private: // NoexceptExpr - Instead of Exceptions, there may be a single Expr* pointing // to the expression in the noexcept() specifier. - // ExceptionSpecDecl - Instead of Exceptions, there may be a single - // FunctionDecl* pointing to the function which should be used to resolve - // this function type's exception specification. + // ExceptionSpecDecl, ExceptionSpecTemplate - Instead of Exceptions, there may + // be a pair of FunctionDecl* pointing to the function which should be used to + // instantiate this function type's exception specification, and the function + // from which it should be instantiated. // ConsumedArgs - A variable size array, following Exceptions // and of length NumArgs, holding flags indicating which arguments @@ -2804,6 +2807,7 @@ public: EPI.NoexceptExpr = getNoexceptExpr(); } else if (EPI.ExceptionSpecType == EST_Uninstantiated) { EPI.ExceptionSpecDecl = getExceptionSpecDecl(); + EPI.ExceptionSpecTemplate = getExceptionSpecTemplate(); } if (hasAnyConsumedArgs()) EPI.ConsumedArguments = getConsumedArgsBuffer(); @@ -2847,10 +2851,22 @@ public: // NoexceptExpr sits where the arguments end. return *reinterpret_cast(arg_type_end()); } + /// \brief If this function type has an uninstantiated exception + /// specification, this is the function whose exception specification + /// is represented by this type. FunctionDecl *getExceptionSpecDecl() const { if (getExceptionSpecType() != EST_Uninstantiated) return 0; - return *reinterpret_cast(arg_type_end()); + return reinterpret_cast(arg_type_end())[0]; + } + /// \brief If this function type has an uninstantiated exception + /// specification, this is the function whose exception specification + /// should be instantiated to find the exception specification for + /// this type. + FunctionDecl *getExceptionSpecTemplate() const { + if (getExceptionSpecType() != EST_Uninstantiated) + return 0; + return reinterpret_cast(arg_type_end())[1]; } bool isNothrow(ASTContext &Ctx) const { ExceptionSpecificationType EST = getExceptionSpecType(); diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp index 65ddc059fa..cb4d336de1 100644 --- a/lib/AST/ASTContext.cpp +++ b/lib/AST/ASTContext.cpp @@ -2195,7 +2195,7 @@ ASTContext::getFunctionType(QualType ResultTy, else if (EPI.ExceptionSpecType == EST_ComputedNoexcept) { Size += sizeof(Expr*); } else if (EPI.ExceptionSpecType == EST_Uninstantiated) { - Size += sizeof(FunctionDecl*); + Size += 2 * sizeof(FunctionDecl*); } if (EPI.ConsumedArguments) Size += NumArgs * sizeof(bool); diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp index 10c1adc875..3f6a09457d 100644 --- a/lib/AST/Type.cpp +++ b/lib/AST/Type.cpp @@ -1550,7 +1550,8 @@ FunctionProtoType::FunctionProtoType(QualType result, const QualType *args, // Store the function decl from which we will resolve our // exception specification. FunctionDecl **slot = reinterpret_cast(argSlot + numArgs); - *slot = epi.ExceptionSpecDecl; + slot[0] = epi.ExceptionSpecDecl; + slot[1] = epi.ExceptionSpecTemplate; // This exception specification doesn't make the type dependent, because // it's not instantiated as part of instantiating the type. } diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp index 669ba3ad37..d2e0e6b63b 100644 --- a/lib/Sema/SemaExpr.cpp +++ b/lib/Sema/SemaExpr.cpp @@ -9776,9 +9776,8 @@ void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func) { // Instantiate the exception specification for any function which is // used: CodeGen will need it. - if (Func->getTemplateInstantiationPattern() && - Func->getType()->castAs()->getExceptionSpecType() - == EST_Uninstantiated) + const FunctionProtoType *FPT = Func->getType()->getAs(); + if (FPT && FPT->getExceptionSpecType() == EST_Uninstantiated) InstantiateExceptionSpec(Loc, Func); // Implicit instantiation of function templates and member functions of diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp index 4d312f855f..c7bd99c1ca 100644 --- a/lib/Sema/SemaTemplateInstantiateDecl.cpp +++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp @@ -2251,6 +2251,8 @@ static void addInstantiatedParametersToScope(Sema &S, FunctionDecl *Function, static void InstantiateExceptionSpec(Sema &SemaRef, FunctionDecl *New, const FunctionProtoType *Proto, const MultiLevelTemplateArgumentList &TemplateArgs) { + assert(Proto->getExceptionSpecType() != EST_Uninstantiated); + // C++11 [expr.prim.general]p3: // If a declaration declares a member function or member function // template of a class X, the expression this is a prvalue of type @@ -2377,20 +2379,8 @@ static void InstantiateExceptionSpec(Sema &SemaRef, FunctionDecl *New, void Sema::InstantiateExceptionSpec(SourceLocation PointOfInstantiation, FunctionDecl *Decl) { - // Find the template declaration which contains the exception specification. - // Per [except.spec]p4, prefer the exception spec on the primary template - // if this is an explicit instantiation. - FunctionDecl *Tmpl = 0; - if (Decl->getPrimaryTemplate()) - Tmpl = Decl->getPrimaryTemplate()->getTemplatedDecl(); - else if (FunctionDecl *MemTmpl = Decl->getInstantiatedFromMemberFunction()) - Tmpl = MemTmpl; - else - Tmpl = Decl->getTemplateInstantiationPattern(); - assert(Tmpl && "can't instantiate non-template"); - - if (Decl->getType()->castAs()->getExceptionSpecType() - != EST_Uninstantiated) + const FunctionProtoType *Proto = Decl->getType()->castAs(); + if (Proto->getExceptionSpecType() != EST_Uninstantiated) return; InstantiatingTemplate Inst(*this, PointOfInstantiation, Decl, @@ -2406,10 +2396,12 @@ void Sema::InstantiateExceptionSpec(SourceLocation PointOfInstantiation, MultiLevelTemplateArgumentList TemplateArgs = getTemplateInstantiationArgs(Decl, 0, /*RelativeToPrimary*/true); - addInstantiatedParametersToScope(*this, Decl, Tmpl, Scope, TemplateArgs); + FunctionDecl *Template = Proto->getExceptionSpecTemplate(); + addInstantiatedParametersToScope(*this, Decl, Template, Scope, TemplateArgs); - const FunctionProtoType *Proto = Tmpl->getType()->castAs(); - ::InstantiateExceptionSpec(*this, Decl, Proto, TemplateArgs); + ::InstantiateExceptionSpec(*this, Decl, + Template->getType()->castAs(), + TemplateArgs); } /// \brief Initializes the common fields of an instantiation function @@ -2457,6 +2449,10 @@ TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, EPI.ExceptionSpecType != EST_None && EPI.ExceptionSpecType != EST_DynamicNone && EPI.ExceptionSpecType != EST_BasicNoexcept) { + FunctionDecl *ExceptionSpecTemplate = Tmpl; + if (EPI.ExceptionSpecType == EST_Uninstantiated) + ExceptionSpecTemplate = EPI.ExceptionSpecTemplate; + // Mark the function has having an uninstantiated exception specification. const FunctionProtoType *NewProto = New->getType()->getAs(); @@ -2464,6 +2460,7 @@ TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, EPI = NewProto->getExtProtoInfo(); EPI.ExceptionSpecType = EST_Uninstantiated; EPI.ExceptionSpecDecl = New; + EPI.ExceptionSpecTemplate = ExceptionSpecTemplate; New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), NewProto->arg_type_begin(), NewProto->getNumArgs(), diff --git a/test/CodeGenCXX/cxx11-exception-spec.cpp b/test/CodeGenCXX/cxx11-exception-spec.cpp index 4e08dce2ae..194b80cdd4 100644 --- a/test/CodeGenCXX/cxx11-exception-spec.cpp +++ b/test/CodeGenCXX/cxx11-exception-spec.cpp @@ -3,9 +3,11 @@ void h(); template void f() noexcept(sizeof(T) == 4) { h(); } +template void g() noexcept(sizeof(T) == 4); template struct S { static void f() noexcept(sizeof(T) == 4) { h(); } + static void g() noexcept(sizeof(T) == 4); }; // CHECK: define {{.*}} @_Z1fIsEvv() { @@ -30,7 +32,7 @@ template void S::f(); // CHECK: define {{.*}} @_ZN1SIA2_DsE1fEv() nounwind template void S::f(); -void g() { +void h() { // CHECK: define {{.*}} @_Z1fIiEvv() nounwind { f(); // CHECK: define {{.*}} @_Z1fIA2_iEvv() { @@ -64,3 +66,55 @@ void g() { // CHECK-NOT: nounwind (void)&S::f; } + +// CHECK: define {{.*}} @_Z1iv +void i() { + // CHECK: declare {{.*}} @_Z1gIiEvv() nounwind + g(); + // CHECK: declare {{.*}} @_Z1gIA2_iEvv() + // CHECK-NOT: nounwind + g(); + + // CHECK: declare {{.*}} @_ZN1SIiE1gEv() nounwind + S::g(); + // CHECK: declare {{.*}} @_ZN1SIA2_iE1gEv() + // CHECK-NOT: nounwind + S::g(); + + // CHECK: declare {{.*}} @_Z1gIfEvv() nounwind + void (*g1)() = &g; + // CHECK: declare {{.*}} @_Z1gIdEvv() + // CHECK-NOT: nounwind + void (*g2)() = &g; + + // CHECK: declare {{.*}} @_ZN1SIfE1gEv() nounwind + void (*g3)() = &S::g; + // CHECK: declare {{.*}} @_ZN1SIdE1gEv() + // CHECK-NOT: nounwind + void (*g4)() = &S::g; + + // CHECK: declare {{.*}} @_Z1gIA4_cEvv() nounwind + (void)&g; + // CHECK: declare {{.*}} @_Z1gIcEvv() + // CHECK-NOT: nounwind + (void)&g; + + // CHECK: declare {{.*}} @_ZN1SIA4_cE1gEv() nounwind + (void)&S::g; + // CHECK: declare {{.*}} @_ZN1SIcE1gEv() + // CHECK-NOT: nounwind + (void)&S::g; +} + +template struct Nested { + template void f() noexcept(sizeof(T) == sizeof(U)); +}; + +// CHECK: define {{.*}} @_Z1jv +void j() { + // CHECK: declare {{.*}} @_ZN6NestedIiE1fILb1EcEEvv( + // CHECK-NOT: nounwind + Nested().f(); + // CHECK: declare {{.*}} @_ZN6NestedIlE1fILb0ElEEvv({{.*}}) nounwind + Nested().f(); +} diff --git a/test/SemaTemplate/instantiate-exception-spec-cxx11.cpp b/test/SemaTemplate/instantiate-exception-spec-cxx11.cpp index d29c8862b9..8a6f9efa68 100644 --- a/test/SemaTemplate/instantiate-exception-spec-cxx11.cpp +++ b/test/SemaTemplate/instantiate-exception-spec-cxx11.cpp @@ -1,4 +1,4 @@ -// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -ftemplate-depth 16 %s +// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -ftemplate-depth 16 -fcxx-exceptions -fexceptions %s // DR1330: an exception specification for a function template is only // instantiated when it is needed. @@ -31,7 +31,7 @@ decltype(S<0>::recurse()) *pVoid1 = 0; // ok, exception spec not needed decltype(&S<0>::recurse) pFn = 0; // ok, exception spec not needed template<> struct S<10> {}; -void (*pFn2)() noexcept = &S<0>::recurse; // expected-note {{instantiation of exception spec}} +void (*pFn2)() noexcept = &S<0>::recurse; // expected-note {{instantiation of exception spec}} expected-error {{not superset}} template T go(T a) noexcept(noexcept(go(a))); // \ @@ -118,3 +118,16 @@ namespace pr9485 { f2(0); // expected-error {{ambiguous}} } } + +struct Exc1 { char c[4]; }; +struct Exc2 { double x, y, z; }; +struct Base { + virtual void f() noexcept; // expected-note {{overridden}} +}; +template struct Derived : Base { + void f() noexcept (sizeof(T) == 4); // expected-error {{is more lax}} + void g() noexcept (T::error); +}; + +Derived d1; // ok +Derived d2; // expected-note {{in instantiation of}} -- 2.40.0