[clang] [APINotes] Add test for C++ class templates (PR #87006)

[Egor Zhdan via cfe-commits]

https://github.com/egorzhdan created https://github.com/llvm/llvm-project/pull/87006

This upstreams https://github.com/apple/llvm-project/pull/7930.

This adds a test to verify that we can apply attributes to C++ class templates using API Notes. Doing the same for function templates is not currently possible and requires more work.

>From f7713493fcde4ce149aa91e3782040f709f9b10f Mon Sep 17 00:00:00 2001
From: Egor Zhdan <e_zhdan at apple.com>
Date: Thu, 28 Mar 2024 20:41:29 +0000
Subject: [PATCH] [APINotes] Add test for C++ class templates

This upstreams https://github.com/apple/llvm-project/pull/7930.

This adds a test to verify that we can apply attributes to C++ class templates using API Notes. Doing the same for function templates is not currently possible and requires more work.
---
 clang/test/APINotes/Inputs/Headers/Templates.apinotes | 5 +++++
 clang/test/APINotes/Inputs/Headers/Templates.h        | 9 +++++++++
 clang/test/APINotes/Inputs/Headers/module.modulemap   | 4 ++++
 clang/test/APINotes/templates.cpp                     | 9 +++++++++
 4 files changed, 27 insertions(+)
 create mode 100644 clang/test/APINotes/Inputs/Headers/Templates.apinotes
 create mode 100644 clang/test/APINotes/Inputs/Headers/Templates.h
 create mode 100644 clang/test/APINotes/templates.cpp

diff --git a/clang/test/APINotes/Inputs/Headers/Templates.apinotes b/clang/test/APINotes/Inputs/Headers/Templates.apinotes
new file mode 100644
index 00000000000000..b7336484da0c79
--- /dev/null
+++ b/clang/test/APINotes/Inputs/Headers/Templates.apinotes
@@ -0,0 +1,5 @@
+---
+Name: Templates
+Tags:
+- Name: Box
+  SwiftImportAs: owned
diff --git a/clang/test/APINotes/Inputs/Headers/Templates.h b/clang/test/APINotes/Inputs/Headers/Templates.h
new file mode 100644
index 00000000000000..862035fee363f7
--- /dev/null
+++ b/clang/test/APINotes/Inputs/Headers/Templates.h
@@ -0,0 +1,9 @@
+template <typename T>
+struct Box {
+  T value;
+
+  const T& get_value() const { return value; }
+  const T* get_ptr() const { return &value; }
+};
+
+using IntBox = Box<int>;
diff --git a/clang/test/APINotes/Inputs/Headers/module.modulemap b/clang/test/APINotes/Inputs/Headers/module.modulemap
index 99fb1aec86481a..d515169184f4f0 100644
--- a/clang/test/APINotes/Inputs/Headers/module.modulemap
+++ b/clang/test/APINotes/Inputs/Headers/module.modulemap
@@ -36,6 +36,10 @@ module Namespaces {
   header "Namespaces.h"
 }
 
+module Templates {
+  header "Templates.h"
+}
+
 module SwiftImportAs {
   header "SwiftImportAs.h"
 }
diff --git a/clang/test/APINotes/templates.cpp b/clang/test/APINotes/templates.cpp
new file mode 100644
index 00000000000000..d4dce291615e18
--- /dev/null
+++ b/clang/test/APINotes/templates.cpp
@@ -0,0 +1,9 @@
+// RUN: rm -rf %t && mkdir -p %t
+// RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/Tmpl -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -x c++
+// RUN: %clang_cc1 -fmodules -fblocks -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache/Tmpl -fdisable-module-hash -fapinotes-modules -fsyntax-only -I %S/Inputs/Headers -F %S/Inputs/Frameworks %s -ast-dump -ast-dump-filter Box -x c++ | FileCheck -check-prefix=CHECK-BOX %s
+
+#include "Templates.h"
+
+// CHECK-BOX: Dumping Box:
+// CHECK-BOX-NEXT: ClassTemplateDecl {{.+}} imported in Templates Box
+// CHECK-BOX: SwiftAttrAttr {{.+}} <<invalid sloc>> "import_owned"