[clang-format] Fix a bug in annotating FunctionDeclarationName (#85361)

A name is not a FunctionDeclarationName if it's preceded by an
Objective-C keyword.

Fixes #84578.

Author: owenca

clang/lib/Format/TokenAnnotator.cpp

@@ -3595,6 +3595,13 @@ static bool isFunctionDeclarationName(const FormatToken &Current,
   if (!Current.Tok.getIdentifierInfo())
     return false;
 
+  const auto &Previous = *Current.Previous;
+
+  if (const auto *PrevPrev = Previous.Previous;
+      PrevPrev && PrevPrev->is(TT_ObjCDecl)) {
+    return false;
+  }
+
   auto skipOperatorName = [](const FormatToken *Next) -> const FormatToken * {
     for (; Next; Next = Next->Next) {
       if (Next->is(TT_OverloadedOperatorLParen))
@@ -3633,18 +3640,17 @@ static bool isFunctionDeclarationName(const FormatToken &Current,
   // Find parentheses of parameter list.
   const FormatToken *Next = Current.Next;
   if (Current.is(tok::kw_operator)) {
-    const auto *Previous = Current.Previous;
-    if (Previous->Tok.getIdentifierInfo() &&
-        !Previous->isOneOf(tok::kw_return, tok::kw_co_return)) {
+    if (Previous.Tok.getIdentifierInfo() &&
+        !Previous.isOneOf(tok::kw_return, tok::kw_co_return)) {
       return true;
     }
-    if (Previous->is(tok::r_paren) && Previous->is(TT_TypeDeclarationParen)) {
-      assert(Previous->MatchingParen);
-      assert(Previous->MatchingParen->is(tok::l_paren));
-      assert(Previous->MatchingParen->is(TT_TypeDeclarationParen));
+    if (Previous.is(tok::r_paren) && Previous.is(TT_TypeDeclarationParen)) {
+      assert(Previous.MatchingParen);
+      assert(Previous.MatchingParen->is(tok::l_paren));
+      assert(Previous.MatchingParen->is(TT_TypeDeclarationParen));
       return true;
     }
-    if (!Previous->isPointerOrReference() && Previous->isNot(TT_TemplateCloser))
+    if (!Previous.isPointerOrReference() && Previous.isNot(TT_TemplateCloser))
       return false;
     Next = skipOperatorName(Next);
   } else {

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -2645,6 +2645,11 @@ TEST_F(TokenAnnotatorTest, StartOfName) {
   EXPECT_TOKEN(Tokens[2], tok::identifier, TT_Unknown);
   EXPECT_TOKEN(Tokens[3], tok::identifier, TT_Unknown);
   EXPECT_TOKEN(Tokens[4], tok::identifier, TT_StartOfName);
+
+  Tokens = annotate("@interface NSCoder (TestCoder)");
+  ASSERT_EQ(Tokens.size(), 7u) << Tokens;
+  EXPECT_TOKEN(Tokens[0], tok::at, TT_ObjCDecl);
+  EXPECT_TOKEN(Tokens[2], tok::identifier, TT_StartOfName);
 }
 
 TEST_F(TokenAnnotatorTest, BraceKind) {