[clang] [Clang][Parse] Delay parsing of noexcept-specifiers in friend function declarations (PR #90517)
Krystian Stasiowski via cfe-commits
cfe-commits at lists.llvm.org
Tue Apr 30 04:44:36 PDT 2024
https://github.com/sdkrystian updated https://github.com/llvm/llvm-project/pull/90517
>From 3f5feb2b17c06f6e001e9324e90eef07fd720539 Mon Sep 17 00:00:00 2001
From: Krystian Stasiowski <sdkrystian at gmail.com>
Date: Mon, 29 Apr 2024 15:34:40 -0400
Subject: [PATCH 1/2] [Clang][Parse] Delay parsing of noexcept-specifiers in
friend function declarations
---
clang/lib/Parse/ParseDecl.cpp | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index a7846e102a43c7..93950e27a08f35 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -7388,12 +7388,20 @@ void Parser::ParseFunctionDeclarator(Declarator &D,
std::optional<Sema::CXXThisScopeRAII> ThisScope;
InitCXXThisScopeForDeclaratorIfRelevant(D, DS, ThisScope);
- // Parse exception-specification[opt].
- // FIXME: Per [class.mem]p6, all exception-specifications at class scope
- // should be delayed, including those for non-members (eg, friend
- // declarations). But only applying this to member declarations is
- // consistent with what other implementations do.
- bool Delayed = D.isFirstDeclarationOfMember() &&
+ // C++ [class.mem.general]p8:
+ // A complete-class context of a class (template) is a
+ // - function body,
+ // - default argument,
+ // - default template argument,
+ // - noexcept-specifier, or
+ // - default member initializer
+ // within the member-specification of the class or class template.
+ //
+ // Parse exception-specification[opt]. If we are in the
+ // member-specification of a class or class template, this is a
+ // complete-class context and parsing of the noexcept-specifier should be
+ // delayed (even if this is a friend declaration).
+ bool Delayed = D.getContext() == DeclaratorContext::Member &&
D.isFunctionDeclaratorAFunctionDeclaration();
if (Delayed && Actions.isLibstdcxxEagerExceptionSpecHack(D) &&
GetLookAheadToken(0).is(tok::kw_noexcept) &&
>From a68b48237edcc7023983fafd0849b0625a18ddbf Mon Sep 17 00:00:00 2001
From: Krystian Stasiowski <sdkrystian at gmail.com>
Date: Tue, 30 Apr 2024 07:44:22 -0400
Subject: [PATCH 2/2] [FOLD] fix delayed parsing of exception specification for
friend functions
---
clang/lib/Sema/SemaDeclCXX.cpp | 30 ++---
clang/lib/Sema/SemaExceptionSpec.cpp | 12 +-
.../class/class.mem/class.mem.general/p8.cpp | 105 ++++++++++++++++++
3 files changed, 127 insertions(+), 20 deletions(-)
create mode 100644 clang/test/CXX/class/class.mem/class.mem.general/p8.cpp
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 338b0ec1e099c0..f0422f6717675b 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -19172,21 +19172,21 @@ void Sema::checkExceptionSpecification(
}
}
-void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
+void Sema::actOnDelayedExceptionSpecification(Decl *D,
ExceptionSpecificationType EST,
SourceRange SpecificationRange,
ArrayRef<ParsedType> DynamicExceptions,
ArrayRef<SourceRange> DynamicExceptionRanges,
Expr *NoexceptExpr) {
- if (!MethodD)
+ if (!D)
return;
- // Dig out the method we're referring to.
- if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD))
- MethodD = FunTmpl->getTemplatedDecl();
+ // Dig out the function we're referring to.
+ if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(D))
+ D = FTD->getTemplatedDecl();
- CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD);
- if (!Method)
+ FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
+ if (!FD)
return;
// Check the exception specification.
@@ -19197,15 +19197,17 @@ void Sema::actOnDelayedExceptionSpecification(Decl *MethodD,
ESI);
// Update the exception specification on the function type.
- Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true);
+ Context.adjustExceptionSpec(FD, ESI, /*AsWritten*/true);
- if (Method->isStatic())
- checkThisInStaticMemberFunctionExceptionSpec(Method);
+ if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
+ if (MD->isStatic())
+ checkThisInStaticMemberFunctionExceptionSpec(MD);
- if (Method->isVirtual()) {
- // Check overrides, which we previously had to delay.
- for (const CXXMethodDecl *O : Method->overridden_methods())
- CheckOverridingFunctionExceptionSpec(Method, O);
+ if (MD->isVirtual()) {
+ // Check overrides, which we previously had to delay.
+ for (const CXXMethodDecl *O : MD->overridden_methods())
+ CheckOverridingFunctionExceptionSpec(MD, O);
+ }
}
}
diff --git a/clang/lib/Sema/SemaExceptionSpec.cpp b/clang/lib/Sema/SemaExceptionSpec.cpp
index c9dd6bb2413e38..776d911be17957 100644
--- a/clang/lib/Sema/SemaExceptionSpec.cpp
+++ b/clang/lib/Sema/SemaExceptionSpec.cpp
@@ -258,13 +258,13 @@ Sema::UpdateExceptionSpec(FunctionDecl *FD,
}
static bool exceptionSpecNotKnownYet(const FunctionDecl *FD) {
- auto *MD = dyn_cast<CXXMethodDecl>(FD);
- if (!MD)
+ ExceptionSpecificationType EST = FD->getType()->castAs<FunctionProtoType>()->getExceptionSpecType();
+ if (EST == EST_Unparsed)
+ return true;
+ else if (EST != EST_Unevaluated)
return false;
-
- auto EST = MD->getType()->castAs<FunctionProtoType>()->getExceptionSpecType();
- return EST == EST_Unparsed ||
- (EST == EST_Unevaluated && MD->getParent()->isBeingDefined());
+ const DeclContext *DC = FD->getLexicalDeclContext();
+ return DC->isRecord() && cast<RecordDecl>(DC)->isBeingDefined();
}
static bool CheckEquivalentExceptionSpecImpl(
diff --git a/clang/test/CXX/class/class.mem/class.mem.general/p8.cpp b/clang/test/CXX/class/class.mem/class.mem.general/p8.cpp
new file mode 100644
index 00000000000000..4584396bbf5e70
--- /dev/null
+++ b/clang/test/CXX/class/class.mem/class.mem.general/p8.cpp
@@ -0,0 +1,105 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+namespace N0 {
+ struct A {
+ void f0() noexcept(x);
+ void g0() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ void f1() noexcept(A::x);
+ void g1() noexcept(A::y); // expected-error {{no member named 'y' in 'N0::A'}}
+
+ template<typename T>
+ void f2() noexcept(x);
+ template<typename T>
+ void g2() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ template<typename T>
+ void f3() noexcept(A::x);
+ template<typename T>
+ void g3() noexcept(A::y); // expected-error {{no member named 'y' in 'N0::A'}}
+
+ friend void f4() noexcept(x);
+ friend void g4() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ friend void f5() noexcept(A::x);
+ friend void g5() noexcept(A::y); // expected-error {{no member named 'y' in 'N0::A'}}
+
+ template<typename T>
+ friend void f6() noexcept(x);
+ template<typename T>
+ friend void g6() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ template<typename T>
+ friend void f7() noexcept(A::x);
+ template<typename T>
+ friend void g7() noexcept(A::y); // expected-error {{no member named 'y' in 'N0::A'}}
+
+ static constexpr bool x = true;
+ };
+} // namespace N0
+
+namespace N1 {
+ template<typename T>
+ struct A {
+ void f0() noexcept(x);
+ void g0() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ void f1() noexcept(A::x);
+ void g1() noexcept(A::y); // expected-error {{no member named 'y' in 'A<T>'}}
+
+ template<typename U>
+ void f2() noexcept(x);
+ template<typename U>
+ void g2() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ template<typename U>
+ void f3() noexcept(A::x);
+ template<typename U>
+ void g3() noexcept(A::y); // expected-error {{no member named 'y' in 'A<T>'}}
+
+ friend void f4() noexcept(x);
+ friend void g4() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ friend void f5() noexcept(A::x);
+ friend void g5() noexcept(A::y); // expected-error {{no member named 'y' in 'A<T>'}}
+
+ template<typename U>
+ friend void f6() noexcept(x);
+ template<typename U>
+ friend void g6() noexcept(y); // expected-error {{use of undeclared identifier 'y'}}
+
+ template<typename U>
+ friend void f7() noexcept(A::x);
+ template<typename U>
+ friend void g7() noexcept(A::y); // expected-error {{no member named 'y' in 'A<T>'}}
+
+ static constexpr bool x = true;
+ };
+} // namespace N1
+
+namespace N2 {
+ void f() noexcept;
+ void g() noexcept;
+
+ struct A {
+ friend void f() noexcept;
+ friend void g() noexcept(x);
+
+ static constexpr bool x = true;
+ };
+} // namespace N2
+
+namespace N3 {
+ void f() noexcept;
+ void g();
+
+ template<typename T>
+ struct A {
+ friend void f() noexcept;
+ friend void g() noexcept(x); // expected-error {{no member 'x' in 'N3::A<int>'; it has not yet been instantiated}}
+ // expected-note at -1 {{in instantiation of exception specification}}
+ static constexpr bool x = false; // expected-note {{not-yet-instantiated member is declared here}}
+ };
+
+ template struct A<int>; // expected-note {{in instantiation of template class}}
+} // namespace N3
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