https://github.com/premanandrao updated
https://github.com/llvm/llvm-project/pull/97619
>From e1076942f07b1d2de857688c88de6ff966861650 Mon Sep 17 00:00:00 2001
From: Premanand M Rao <premanand.m....@intel.com>
Date: Wed, 3 Jul 2024 11:20:42 -0700
Subject: [PATCH 1/2] [clang] Diagnose use of deprecated template alias
Issue a warning diagnostic when a template alias with a
deprecated attribute is used.
---
clang/lib/Sema/SemaAvailability.cpp | 6 ++
clang/lib/Sema/SemaTemplate.cpp | 4 ++
.../alias-template-deprecated.cpp | 58 +++++++++++++++++++
3 files changed, 68 insertions(+)
create mode 100644 clang/test/SemaTemplate/alias-template-deprecated.cpp
diff --git a/clang/lib/Sema/SemaAvailability.cpp
b/clang/lib/Sema/SemaAvailability.cpp
index df83bbfb7aac8..17566c226ec80 100644
--- a/clang/lib/Sema/SemaAvailability.cpp
+++ b/clang/lib/Sema/SemaAvailability.cpp
@@ -107,6 +107,12 @@ ShouldDiagnoseAvailabilityOfDecl(Sema &S, const NamedDecl
*D,
break;
}
+ // For alias templates, get the underlying declaration.
+ if (const auto *ADecl = dyn_cast<TypeAliasTemplateDecl>(D)) {
+ D = ADecl->getTemplatedDecl();
+ Result = D->getAvailability(Message);
+ }
+
// Forward class declarations get their attributes from their definition.
if (const auto *IDecl = dyn_cast<ObjCInterfaceDecl>(D)) {
if (IDecl->getDefinition()) {
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 6879a9a274b5c..0e7663b82f437 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -4539,6 +4539,10 @@ QualType Sema::CheckTemplateIdType(TemplateName Name,
*this, /*PointOfInstantiation=*/TemplateLoc,
/*Entity=*/AliasTemplate,
/*TemplateArgs=*/TemplateArgLists.getInnermost());
+
+ // Diagnose uses of this alias.
+ (void)DiagnoseUseOfDecl(AliasTemplate, TemplateLoc);
+
if (Inst.isInvalid())
return QualType();
diff --git a/clang/test/SemaTemplate/alias-template-deprecated.cpp
b/clang/test/SemaTemplate/alias-template-deprecated.cpp
new file mode 100644
index 0000000000000..10242d7a810b0
--- /dev/null
+++ b/clang/test/SemaTemplate/alias-template-deprecated.cpp
@@ -0,0 +1,58 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+//
+// This test checks that a deprecated attribute on an alias
+// template triggers a warning diagnostic when it is used.
+
+template <typename T>
+struct NoAttr {
+ void foo() {}
+};
+
+// expected-note@+2 5{{'UsingWithAttr' has been explicitly marked deprecated
here}}
+template <typename T>
+using UsingWithAttr __attribute__((deprecated)) = NoAttr<T>;
+
+// expected-note@+1 {{'UsingInstWithAttr' has been explicitly marked
deprecated here}}
+using UsingInstWithAttr __attribute__((deprecated)) = NoAttr<int>;
+
+// expected-note@+1 {{'TDWithAttr' has been explicitly marked deprecated here}}
+typedef NoAttr<int> TDWithAttr __attribute__((deprecated));
+
+// expected-warning@+1 {{'UsingWithAttr' is deprecated}}
+typedef UsingWithAttr<int> TDUsingWithAttr;
+
+typedef NoAttr<int> TDNoAttr;
+
+// expected-note@+1 {{'UsingTDWithAttr' has been explicitly marked deprecated
here}}
+using UsingTDWithAttr __attribute__((deprecated)) = TDNoAttr;
+
+struct S {
+ NoAttr<float> f1;
+ // expected-warning@+1 {{'UsingWithAttr' is deprecated}}
+ UsingWithAttr<float> f2;
+};
+
+// expected-warning@+1 {{'UsingWithAttr' is deprecated}}
+void foo(NoAttr<short> s1, UsingWithAttr<short> s2) {
+}
+
+void bar() {
+ NoAttr<int> obj; // Okay
+
+ // expected-warning@+2 {{'UsingWithAttr' is deprecated}}
+ // expected-note@+1 {{in instantiation of template type alias
'UsingWithAttr' requested here}}
+ UsingWithAttr<int> objUsingWA;
+
+ // expected-warning@+2 {{'UsingWithAttr' is deprecated}}
+ // expected-note@+1 {{in instantiation of template type alias
'UsingWithAttr' requested here}}
+ UsingWithAttr<int>().foo();
+
+ // expected-warning@+1 {{'UsingInstWithAttr' is deprecated}}
+ UsingInstWithAttr objUIWA;
+
+ // expected-warning@+1 {{'TDWithAttr' is deprecated}}
+ TDWithAttr objTDWA;
+
+ // expected-warning@+1 {{'UsingTDWithAttr' is deprecated}}
+ UsingTDWithAttr objUTDWA;
+}
>From edfde66fb644eceb4751e1cc55c95028cdb8c483 Mon Sep 17 00:00:00 2001
From: Premanand M Rao <premanand.m....@intel.com>
Date: Tue, 16 Jul 2024 11:23:13 -0700
Subject: [PATCH 2/2] Address CR comments: add case with c++ attribute syntax
---
.../SemaTemplate/alias-template-deprecated.cpp | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/clang/test/SemaTemplate/alias-template-deprecated.cpp
b/clang/test/SemaTemplate/alias-template-deprecated.cpp
index 10242d7a810b0..2273606d27143 100644
--- a/clang/test/SemaTemplate/alias-template-deprecated.cpp
+++ b/clang/test/SemaTemplate/alias-template-deprecated.cpp
@@ -36,6 +36,13 @@ struct S {
void foo(NoAttr<short> s1, UsingWithAttr<short> s2) {
}
+// expected-note@+2 {{'UsingWithCPPAttr' has been explicitly marked deprecated
here}}
+template <typename T>
+using UsingWithCPPAttr [[deprecated]] = NoAttr<T>;
+
+// expected-note@+1 {{'UsingInstWithCPPAttr' has been explicitly marked
deprecated here}}
+using UsingInstWithCPPAttr [[deprecated("Do not use this")]] = NoAttr<int>;
+
void bar() {
NoAttr<int> obj; // Okay
@@ -55,4 +62,11 @@ void bar() {
// expected-warning@+1 {{'UsingTDWithAttr' is deprecated}}
UsingTDWithAttr objUTDWA;
+
+ // expected-warning@+2 {{'UsingWithCPPAttr' is deprecated}}
+ // expected-note@+1 {{in instantiation of template type alias
'UsingWithCPPAttr' requested here}}
+ UsingWithCPPAttr<int> objUsingWCPPA;
+
+ // expected-warning@+1 {{'UsingInstWithCPPAttr' is deprecated: Do not use
this}}
+ UsingInstWithCPPAttr objUICPPWA;
}
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