https://github.com/Endilll updated
https://github.com/llvm/llvm-project/pull/92295
>From a0d5a234431f3db2f0283ffa0909bf8c254aa611 Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladis...@gmail.com>
Date: Wed, 15 May 2024 20:20:43 +0300
Subject: [PATCH 1/5] [clang] Implement CWG2428 "Deprecating a concept"
---
clang/include/clang/Sema/Sema.h | 3 ++-
clang/lib/Parse/ParseTemplate.cpp | 15 +++++++++------
clang/lib/Sema/SemaTemplate.cpp | 8 +++++++-
clang/test/CXX/drs/cwg24xx.cpp | 28 ++++++++++++++++++++++++++++
clang/www/cxx_dr_status.html | 22 +++++++++++++++++-----
5 files changed, 63 insertions(+), 13 deletions(-)
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 6a414aa57f32b..330076ca77371 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -9356,7 +9356,8 @@ class Sema final : public SemaBase {
Decl *ActOnConceptDefinition(Scope *S,
MultiTemplateParamsArg TemplateParameterLists,
const IdentifierInfo *Name,
- SourceLocation NameLoc, Expr *ConstraintExpr);
+ SourceLocation NameLoc, Expr *ConstraintExpr,
+ const ParsedAttributesView &Attrs);
void CheckConceptRedefinition(ConceptDecl *NewDecl, LookupResult &Previous,
bool &AddToScope);
diff --git a/clang/lib/Parse/ParseTemplate.cpp
b/clang/lib/Parse/ParseTemplate.cpp
index 665253a6674d2..b8f2b3f9657e7 100644
--- a/clang/lib/Parse/ParseTemplate.cpp
+++ b/clang/lib/Parse/ParseTemplate.cpp
@@ -167,9 +167,11 @@ Parser::DeclGroupPtrTy
Parser::ParseTemplateDeclarationOrSpecialization(
LastParamListWasEmpty);
// Parse the actual template declaration.
- if (Tok.is(tok::kw_concept))
- return Actions.ConvertDeclToDeclGroup(
- ParseConceptDefinition(TemplateInfo, DeclEnd));
+ if (Tok.is(tok::kw_concept)) {
+ Decl *ConceptDecl = ParseConceptDefinition(TemplateInfo, DeclEnd);
+ ParsingTemplateParams.complete(ConceptDecl);
+ return Actions.ConvertDeclToDeclGroup(ConceptDecl);
+ }
return ParseDeclarationAfterTemplate(
Context, TemplateInfo, ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
@@ -316,7 +318,8 @@ Parser::ParseConceptDefinition(const ParsedTemplateInfo
&TemplateInfo,
const IdentifierInfo *Id = Result.Identifier;
SourceLocation IdLoc = Result.getBeginLoc();
- DiagnoseAndSkipCXX11Attributes();
+ ParsedAttributes Attrs(AttrFactory);
+ MaybeParseCXX11Attributes(Attrs);
if (!TryConsumeToken(tok::equal)) {
Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
@@ -335,8 +338,8 @@ Parser::ParseConceptDefinition(const ParsedTemplateInfo
&TemplateInfo,
ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
Expr *ConstraintExpr = ConstraintExprResult.get();
return Actions.ActOnConceptDefinition(getCurScope(),
- *TemplateInfo.TemplateParams,
- Id, IdLoc, ConstraintExpr);
+ *TemplateInfo.TemplateParams, Id,
IdLoc,
+ ConstraintExpr, Attrs);
}
/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index c7aac068e264b..2da933896b4da 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -5583,6 +5583,8 @@ Sema::CheckConceptTemplateId(const CXXScopeSpec &SS,
/*UpdateArgsWithConversions=*/false))
return ExprError();
+ DiagnoseUseOfDecl(NamedConcept, ConceptNameInfo.getLoc());
+
auto *CSD = ImplicitConceptSpecializationDecl::Create(
Context, NamedConcept->getDeclContext(), NamedConcept->getLocation(),
CanonicalConverted);
@@ -9787,7 +9789,8 @@ Decl *Sema::ActOnTemplateDeclarator(Scope *S,
Decl *Sema::ActOnConceptDefinition(
Scope *S, MultiTemplateParamsArg TemplateParameterLists,
- const IdentifierInfo *Name, SourceLocation NameLoc, Expr *ConstraintExpr) {
+ const IdentifierInfo *Name, SourceLocation NameLoc, Expr *ConstraintExpr,
+ const ParsedAttributesView &Attrs) {
DeclContext *DC = CurContext;
if (!DC->getRedeclContext()->isFileContext()) {
@@ -9849,6 +9852,9 @@ Decl *Sema::ActOnConceptDefinition(
ActOnDocumentableDecl(NewDecl);
if (AddToScope)
PushOnScopeChains(NewDecl, S);
+
+ ProcessDeclAttributeList(S, NewDecl, Attrs);
+
return NewDecl;
}
diff --git a/clang/test/CXX/drs/cwg24xx.cpp b/clang/test/CXX/drs/cwg24xx.cpp
index 9f876cd870834..805a95c30470e 100644
--- a/clang/test/CXX/drs/cwg24xx.cpp
+++ b/clang/test/CXX/drs/cwg24xx.cpp
@@ -45,6 +45,34 @@ void fallthrough(int n) {
#endif
}
+namespace cwg2428 { // cwg2428: 19
+#if __cplusplus >= 202002L
+template <typename>
+concept C [[deprecated]] = true; // #C
+
+template <typename T>
+concept C3 = C<T>;
+// expected-warning@-1 {{'C' is deprecated}}
+// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+
+template <typename T, C U>
+// expected-warning@-1 {{'C' is deprecated}}
+// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+requires C<T>
+// expected-warning@-1 {{'C' is deprecated}}
+// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+void f() {
+ bool b = C<int>;
+ // expected-warning@-1 {{'C' is deprecated}}
+ // expected-note@#C {{'C' has been explicitly marked deprecated here}}
+};
+
+void g(C auto a) {};
+// expected-warning@-1 {{'C' is deprecated}}
+// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+#endif
+} // namespace cwg2428
+
namespace cwg2450 { // cwg2450: 18
#if __cplusplus >= 202302L
struct S {int a;};
diff --git a/clang/www/cxx_dr_status.html b/clang/www/cxx_dr_status.html
index 92fdcf5556ede..5e33b7492d81d 100755
--- a/clang/www/cxx_dr_status.html
+++ b/clang/www/cxx_dr_status.html
@@ -10698,7 +10698,7 @@ <h2 id="cxxdr">C++ defect report implementation
status</h2>
<td><a
href="https://cplusplus.github.io/CWG/issues/1815.html";>1815</a></td>
<td>CD4</td>
<td>Lifetime extension in aggregate initialization</td>
- <td class="unreleased" align="center">Clang 19</td>
+ <td class="full" align="center">Yes</td>
</tr>
<tr id="1816">
<td><a
href="https://cplusplus.github.io/CWG/issues/1816.html";>1816</a></td>
@@ -14376,7 +14376,7 @@ <h2 id="cxxdr">C++ defect report implementation
status</h2>
<td><a
href="https://cplusplus.github.io/CWG/issues/2428.html";>2428</a></td>
<td>C++23</td>
<td>Deprecating a concept</td>
- <td class="unknown" align="center">Unknown</td>
+ <td class="unreleased" align="center">Clang 19</td>
</tr>
<tr id="2429">
<td><a
href="https://cplusplus.github.io/CWG/issues/2429.html";>2429</a></td>
@@ -16985,7 +16985,7 @@ <h2 id="cxxdr">C++ defect report implementation
status</h2>
</tr>
<tr class="open" id="2863">
<td><a
href="https://cplusplus.github.io/CWG/issues/2863.html";>2863</a></td>
- <td>tentatively ready</td>
+ <td>drafting</td>
<td>Unclear synchronization requirements for object lifetime rules</td>
<td align="center">Not resolved</td>
</tr>
@@ -17021,13 +17021,13 @@ <h2 id="cxxdr">C++ defect report implementation
status</h2>
</tr>
<tr class="open" id="2869">
<td><a
href="https://cplusplus.github.io/CWG/issues/2869.html";>2869</a></td>
- <td>open</td>
+ <td>review</td>
<td><TT>this</TT> in local classes</td>
<td align="center">Not resolved</td>
</tr>
<tr class="open" id="2870">
<td><a
href="https://cplusplus.github.io/CWG/issues/2870.html";>2870</a></td>
- <td>open</td>
+ <td>review</td>
<td>Combining absent <I>encoding-prefix</I>es</td>
<td align="center">Not resolved</td>
</tr>
@@ -17138,6 +17138,18 @@ <h2 id="cxxdr">C++ defect report implementation
status</h2>
<td>open</td>
<td>Missing cases for reference and array types for argument-dependent
lookup</td>
<td align="center">Not resolved</td>
+ </tr>
+ <tr class="open" id="2889">
+ <td><a
href="https://cplusplus.github.io/CWG/issues/2889.html";>2889</a></td>
+ <td>open</td>
+ <td>Requiring an accessible destructor for destroying operator delete</td>
+ <td align="center">Not resolved</td>
+ </tr>
+ <tr class="open" id="2890">
+ <td><a
href="https://cplusplus.github.io/CWG/issues/2890.html";>2890</a></td>
+ <td>open</td>
+ <td>Defining members of local classes</td>
+ <td align="center">Not resolved</td>
</tr></table>
</div>
>From 1ad9b19101e47b6d0d3f3c1063b93194d31ccb16 Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladis...@gmail.com>
Date: Wed, 15 May 2024 23:32:07 +0300
Subject: [PATCH 2/5] Address review feedback
---
clang/docs/ReleaseNotes.rst | 3 +++
clang/test/CXX/drs/cwg24xx.cpp | 16 ++++++++++------
2 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index ae699ebfc6038..1f51879e914f2 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -222,6 +222,9 @@ Resolutions to C++ Defect Reports
- Clang now diagnoses declarative nested-name-specifiers with
pack-index-specifiers.
(`CWG2858: Declarative nested-name-specifiers and pack-index-specifiers
<https://cplusplus.github.io/CWG/issues/2858.html>`_).
+- Clang now allows attributes on concepts.
+ (`CWG2428: Deprecating a concept
<https://cplusplus.github.io/CWG/issues/2428.html>`_).
+
- P0522 implementation is enabled by default in all language versions, and
provisional wording for CWG2398 is implemented.
diff --git a/clang/test/CXX/drs/cwg24xx.cpp b/clang/test/CXX/drs/cwg24xx.cpp
index 4fc3d2db789a7..d329a703829db 100644
--- a/clang/test/CXX/drs/cwg24xx.cpp
+++ b/clang/test/CXX/drs/cwg24xx.cpp
@@ -48,28 +48,32 @@ void fallthrough(int n) {
namespace cwg2428 { // cwg2428: 19
#if __cplusplus >= 202002L
template <typename>
-concept C [[deprecated]] = true; // #C
+concept C [[deprecated]] = true; // #cwg2428-C
+
+template <typename>
+[[deprecated]] concept C2 = true;
+// expected-error@-1 {{expected unqualified-id}}
template <typename T>
concept C3 = C<T>;
// expected-warning@-1 {{'C' is deprecated}}
-// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+// expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
template <typename T, C U>
// expected-warning@-1 {{'C' is deprecated}}
-// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+// expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
requires C<T>
// expected-warning@-1 {{'C' is deprecated}}
-// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+// expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
void f() {
bool b = C<int>;
// expected-warning@-1 {{'C' is deprecated}}
- // expected-note@#C {{'C' has been explicitly marked deprecated here}}
+ // expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
};
void g(C auto a) {};
// expected-warning@-1 {{'C' is deprecated}}
-// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+// expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
#endif
} // namespace cwg2428
>From 019a1694a77c0af6f6fc5bf4cb1bc564acc2c1a1 Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladis...@gmail.com>
Date: Thu, 16 May 2024 13:33:28 +0300
Subject: [PATCH 3/5] Add the test suggested by @cor3ntin
---
clang/lib/Sema/SemaDecl.cpp | 10 ++++++++++
clang/lib/Sema/SemaType.cpp | 10 ++++++++++
clang/test/CXX/drs/cwg24xx.cpp | 10 ++++++++++
3 files changed, 30 insertions(+)
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 0dbdf923df95a..fbf1a64df7492 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -7573,6 +7573,16 @@ NamedDecl *Sema::ActOnVariableDeclarator(
tryToFixVariablyModifiedVarType(TInfo, R, D.getIdentifierLoc(),
/*DiagID=*/0);
+ if (getLangOpts().CPlusPlus20) {
+ if (const AutoType *AutoT = R->getAs<AutoType>()) {
+ if (ConceptDecl *Decl = AutoT->getTypeConstraintConcept()) {
+ DiagnoseUseOfDecl(
+ Decl,
+ TInfo->getTypeLoc().getContainedAutoTypeLoc().getConceptNameLoc());
+ }
+ }
+ }
+
bool IsMemberSpecialization = false;
bool IsVariableTemplateSpecialization = false;
bool IsPartialSpecialization = false;
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
index eb67546d048ae..27736485962f4 100644
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -6388,6 +6388,16 @@ TypeResult Sema::ActOnTypeName(Declarator &D) {
CheckExtraCXXDefaultArguments(D);
}
+ if (getLangOpts().CPlusPlus20) {
+ if (const AutoType *AutoT = T->getAs<AutoType>()) {
+ if (ConceptDecl *Decl = AutoT->getTypeConstraintConcept()) {
+ DiagnoseUseOfDecl(
+ Decl,
+ TInfo->getTypeLoc().getContainedAutoTypeLoc().getConceptNameLoc());
+ }
+ }
+ }
+
return CreateParsedType(T, TInfo);
}
diff --git a/clang/test/CXX/drs/cwg24xx.cpp b/clang/test/CXX/drs/cwg24xx.cpp
index d329a703829db..4c7b1506e86ea 100644
--- a/clang/test/CXX/drs/cwg24xx.cpp
+++ b/clang/test/CXX/drs/cwg24xx.cpp
@@ -74,6 +74,16 @@ void f() {
void g(C auto a) {};
// expected-warning@-1 {{'C' is deprecated}}
// expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
+
+template <typename T>
+auto h() -> C auto {
+// expected-warning@-1 {{'C' is deprecated}}
+// expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
+ C auto foo = T();
+ // expected-warning@-1 {{'C' is deprecated}}
+ // expected-note@#cwg2428-C {{'C' has been explicitly marked deprecated
here}}
+ return foo;
+}
#endif
} // namespace cwg2428
>From 308adb3489ef9905966c692669ea17eb644b00d3 Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladis...@gmail.com>
Date: Thu, 16 May 2024 13:56:58 +0300
Subject: [PATCH 4/5] Factor out `CheckConstrainedAuto()`
---
clang/include/clang/Sema/Sema.h | 2 ++
clang/lib/Sema/SemaChecking.cpp | 12 ++++++++++++
clang/lib/Sema/SemaDecl.cpp | 10 +---------
clang/lib/Sema/SemaType.cpp | 10 +---------
4 files changed, 16 insertions(+), 18 deletions(-)
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 330076ca77371..1ce3f171950bb 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -2022,6 +2022,8 @@ class Sema final : public SemaBase {
void CheckTCBEnforcement(const SourceLocation CallExprLoc,
const NamedDecl *Callee);
+ void CheckConstrainedAuto(TypeSourceInfo *TS);
+
private:
void CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
const ArraySubscriptExpr *ASE = nullptr,
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index ecd1821651140..5607d8e574bf6 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -8092,6 +8092,18 @@ void Sema::checkCall(NamedDecl *FDecl, const
FunctionProtoType *Proto,
diagnoseArgDependentDiagnoseIfAttrs(FD, ThisArg, Args, Loc);
}
+void Sema::CheckConstrainedAuto(TypeSourceInfo *TS) {
+ if (getLangOpts().CPlusPlus20) {
+ if (const AutoType *AutoT = TS->getType()->getAs<AutoType>()) {
+ if (ConceptDecl *Decl = AutoT->getTypeConstraintConcept()) {
+ DiagnoseUseOfDecl(
+ Decl,
+ TS->getTypeLoc().getContainedAutoTypeLoc().getConceptNameLoc());
+ }
+ }
+ }
+}
+
/// CheckConstructorCall - Check a constructor call for correctness and safety
/// properties not enforced by the C type system.
void Sema::CheckConstructorCall(FunctionDecl *FDecl, QualType ThisType,
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index fbf1a64df7492..7ac2e80c9aeb2 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -7573,15 +7573,7 @@ NamedDecl *Sema::ActOnVariableDeclarator(
tryToFixVariablyModifiedVarType(TInfo, R, D.getIdentifierLoc(),
/*DiagID=*/0);
- if (getLangOpts().CPlusPlus20) {
- if (const AutoType *AutoT = R->getAs<AutoType>()) {
- if (ConceptDecl *Decl = AutoT->getTypeConstraintConcept()) {
- DiagnoseUseOfDecl(
- Decl,
- TInfo->getTypeLoc().getContainedAutoTypeLoc().getConceptNameLoc());
- }
- }
- }
+ CheckConstrainedAuto(TInfo);
bool IsMemberSpecialization = false;
bool IsVariableTemplateSpecialization = false;
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
index 27736485962f4..4c54958d7912a 100644
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -6388,15 +6388,7 @@ TypeResult Sema::ActOnTypeName(Declarator &D) {
CheckExtraCXXDefaultArguments(D);
}
- if (getLangOpts().CPlusPlus20) {
- if (const AutoType *AutoT = T->getAs<AutoType>()) {
- if (ConceptDecl *Decl = AutoT->getTypeConstraintConcept()) {
- DiagnoseUseOfDecl(
- Decl,
- TInfo->getTypeLoc().getContainedAutoTypeLoc().getConceptNameLoc());
- }
- }
- }
+ CheckConstrainedAuto(TInfo);
return CreateParsedType(T, TInfo);
}
>From c511b90c140c758420f65252df7da629d6ae6a4b Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladis...@gmail.com>
Date: Thu, 16 May 2024 14:54:20 +0300
Subject: [PATCH 5/5] Allow non-standard attribute spellings
---
clang/lib/Parse/ParseTemplate.cpp | 2 +-
clang/test/SemaCXX/cxx-deprecated.cpp | 23 ++++++++++++++++++++++-
2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/clang/lib/Parse/ParseTemplate.cpp
b/clang/lib/Parse/ParseTemplate.cpp
index b8f2b3f9657e7..e6a41d8830caa 100644
--- a/clang/lib/Parse/ParseTemplate.cpp
+++ b/clang/lib/Parse/ParseTemplate.cpp
@@ -319,7 +319,7 @@ Parser::ParseConceptDefinition(const ParsedTemplateInfo
&TemplateInfo,
SourceLocation IdLoc = Result.getBeginLoc();
ParsedAttributes Attrs(AttrFactory);
- MaybeParseCXX11Attributes(Attrs);
+ MaybeParseAttributes(PAKM_GNU | PAKM_Declspec | PAKM_CXX11, Attrs);
if (!TryConsumeToken(tok::equal)) {
Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
diff --git a/clang/test/SemaCXX/cxx-deprecated.cpp
b/clang/test/SemaCXX/cxx-deprecated.cpp
index aa4501d53197a..8e81fc4e3b0c4 100644
--- a/clang/test/SemaCXX/cxx-deprecated.cpp
+++ b/clang/test/SemaCXX/cxx-deprecated.cpp
@@ -1,4 +1,5 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -std=c++1z %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++20 -fms-extensions %s
namespace [[deprecated]] {} // expected-warning {{'deprecated' attribute on
anonymous namespace ignored}}
@@ -27,3 +28,23 @@ namespace M = N; // expected-warning {{'N' is deprecated}}
// Shouldn't diag:
[[nodiscard, deprecated("")]] int PR37935();
+
+namespace cxx20_concept {
+template <typename>
+concept C __attribute__((deprecated)) = true; // #C
+
+template <C T>
+// expected-warning@-1 {{'C' is deprecated}}
+// expected-note@#C {{'C' has been explicitly marked deprecated here}}
+void f();
+
+#ifdef _MSC_VER
+template <typename>
+concept C2 __declspec(deprecated) = true; // #C2
+
+template <C2 T>
+// expected-warning@-1 {{'C2' is deprecated}}
+// expected-note@#C2 {{'C2' has been explicitly marked deprecated here}}
+void g();
+#endif
+} // namespace cxx20_concept
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