[llvm-branch-commits] [clang] release/21.x: [clang-format] Fix a regression of annotating PointerOrReference (#149039) (PR #149451)

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https://github.com/llvmbot created 
https://github.com/llvm/llvm-project/pull/149451

Backport a8f5e9ed6b44562938ce07e2790be90be8f0a6b5

Requested by: @owenca

>From 24b8c4731093804c8e20ceb5eb5980e6d4c641b1 Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpi...@gmail.com>
Date: Thu, 17 Jul 2025 21:43:43 -0700
Subject: [PATCH] [clang-format] Fix a regression of annotating
 PointerOrReference (#149039)

Fixes #149010

(cherry picked from commit a8f5e9ed6b44562938ce07e2790be90be8f0a6b5)
---
 clang/lib/Format/TokenAnnotator.cpp           | 10 +++++++---
 clang/unittests/Format/TokenAnnotatorTest.cpp |  4 ++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp 
b/clang/lib/Format/TokenAnnotator.cpp
index 739209a5681f8..581bfbab0972d 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2996,14 +2996,18 @@ class AnnotatingParser {
     const FormatToken *PrevToken = Tok.getPreviousNonComment();
     if (!PrevToken)
       return TT_UnaryOperator;
-    if (PrevToken->is(TT_TypeName))
+    if (PrevToken->isTypeName(LangOpts))
       return TT_PointerOrReference;
     if (PrevToken->isPlacementOperator() && Tok.is(tok::ampamp))
       return TT_BinaryOperator;
 
-    const FormatToken *NextToken = Tok.getNextNonComment();
+    auto *NextToken = Tok.getNextNonComment();
     if (!NextToken)
       return TT_PointerOrReference;
+    if (NextToken->is(tok::greater)) {
+      NextToken->setFinalizedType(TT_TemplateCloser);
+      return TT_PointerOrReference;
+    }
 
     if (InTemplateArgument && NextToken->is(tok::kw_noexcept))
       return TT_BinaryOperator;
@@ -3112,7 +3116,7 @@ class AnnotatingParser {
 
     // It's more likely that & represents operator& than an uninitialized
     // reference.
-    if (Tok.is(tok::amp) && PrevToken && PrevToken->Tok.isAnyIdentifier() &&
+    if (Tok.is(tok::amp) && PrevToken->Tok.isAnyIdentifier() &&
         IsChainedOperatorAmpOrMember(PrevToken->getPreviousNonComment()) &&
         NextToken && NextToken->Tok.isAnyIdentifier()) {
       if (auto NextNext = NextToken->getNextNonComment();
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp 
b/clang/unittests/Format/TokenAnnotatorTest.cpp
index e281a4945a862..ce7787ede0f5c 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -390,6 +390,10 @@ TEST_F(TokenAnnotatorTest, UnderstandsUsesOfStarAndAmp) {
   EXPECT_TOKEN(Tokens[20], tok::l_brace, TT_CompoundRequirementLBrace);
   EXPECT_TOKEN(Tokens[22], tok::star, TT_BinaryOperator);
 
+  Tokens = annotate("bool foo = requires { static_cast<Foo &&>(1); };");
+  ASSERT_EQ(Tokens.size(), 17u) << Tokens;
+  EXPECT_TOKEN(Tokens[8], tok::ampamp, TT_PointerOrReference);
+
   Tokens = annotate("return s.operator int *();");
   ASSERT_EQ(Tokens.size(), 10u) << Tokens;
   // Not TT_FunctionDeclarationName.

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