From f54d42abcf82e122ed0ac4688f01c1f4da5599f2 Mon Sep 17 00:00:00 2001
From: Emilia Dreamer <emilia@rymiel.space>
Date: Mon, 5 Sep 2022 12:19:31 +0200
Subject: [PATCH] [clang-format] Don't put `noexcept` on empty line following
 constructor

With the AlwaysBreakTemplateDeclarations option, having a constructor
template for a type consisting of all-uppercase letters with a
noexcept specifier would put said noexcept specifier on its own blank
line.

This is because the all-uppercase type is understood as a macro-like
attribute (such as DEPRECATED()), and noexcept is seen as the
declaration. However, noexcept is a keyword and cannot be an
identifier on its own.

Fixes https://github.com/llvm/llvm-project/issues/56216

Differential Revision: https://reviews.llvm.org/D132189
---
 clang/lib/Format/TokenAnnotator.cpp           |  2 +-
 clang/unittests/Format/FormatTest.cpp         | 12 ++++++++++++
 clang/unittests/Format/TokenAnnotatorTest.cpp | 13 +++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 2a64a3b..663e8ae 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1924,7 +1924,7 @@ private:
           !Current.Next->isBinaryOperator() &&
           !Current.Next->isOneOf(tok::semi, tok::colon, tok::l_brace,
                                  tok::comma, tok::period, tok::arrow,
-                                 tok::coloncolon)) {
+                                 tok::coloncolon, tok::kw_noexcept)) {
         if (FormatToken *AfterParen = Current.MatchingParen->Next) {
           // Make sure this isn't the return type of an Obj-C block declaration
           if (AfterParen->isNot(tok::caret)) {
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index d330c65..ce56570 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -9607,6 +9607,15 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
   verifyFormat("template <typename T> // T can be A, B or C.\n"
                "struct C {};",
                AlwaysBreak);
+  verifyFormat("template <typename T>\n"
+               "C(T) noexcept;",
+               AlwaysBreak);
+  verifyFormat("template <typename T>\n"
+               "ClassName(T) noexcept;",
+               AlwaysBreak);
+  verifyFormat("template <typename T>\n"
+               "POOR_NAME(T) noexcept;",
+               AlwaysBreak);
   verifyFormat("template <enum E> class A {\n"
                "public:\n"
                "  E *f();\n"
@@ -9617,6 +9626,9 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
   verifyFormat("template <typename T> class C {};", NeverBreak);
   verifyFormat("template <typename T> void f();", NeverBreak);
   verifyFormat("template <typename T> void f() {}", NeverBreak);
+  verifyFormat("template <typename T> C(T) noexcept;", NeverBreak);
+  verifyFormat("template <typename T> ClassName(T) noexcept;", NeverBreak);
+  verifyFormat("template <typename T> POOR_NAME(T) noexcept;", NeverBreak);
   verifyFormat("template <typename T>\nvoid foo(aaaaaaaaaaaaaaaaaaaaaaaaaa "
                "bbbbbbbbbbbbbbbbbbbb) {}",
                NeverBreak);
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index 6a10d67..21ef5c3 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -788,6 +788,19 @@ TEST_F(TokenAnnotatorTest, UnderstandsLambdas) {
   EXPECT_TOKEN(Tokens[7], tok::l_brace, TT_LambdaLBrace);
 }
 
+TEST_F(TokenAnnotatorTest, UnderstandsFunctionAnnotations) {
+  auto Tokens = annotate("template <typename T>\n"
+                         "DEPRECATED(\"Use NewClass::NewFunction instead.\")\n"
+                         "string OldFunction(const string &parameter) {}");
+  ASSERT_EQ(Tokens.size(), 20u) << Tokens;
+  EXPECT_TOKEN(Tokens[8], tok::r_paren, TT_FunctionAnnotationRParen);
+
+  Tokens = annotate("template <typename T>\n"
+                    "A(T) noexcept;");
+  ASSERT_EQ(Tokens.size(), 12u) << Tokens;
+  EXPECT_TOKEN(Tokens[8], tok::r_paren, TT_Unknown);
+}
+
 TEST_F(TokenAnnotatorTest, UnderstandsVerilogOperators) {
   auto Annotate = [this](llvm::StringRef Code) {
     return annotate(Code, getLLVMStyle(FormatStyle::LK_Verilog));
-- 
2.7.4