[clang] [clang-format] Correctly annotate braces in macro definition (PR #107352)

[Owen Pan via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/107352

Also add a test case for #106418.

Fixes #107096.

>From 8b359c9ab7e2b119383235c042f9804136ee172e Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Wed, 4 Sep 2024 21:41:28 -0700
Subject: [PATCH] [clang-format] Correctly annotate braces in macro definition

Also add a test case for #106418.

Fixes #107096.
---
 clang/lib/Format/UnwrappedLineParser.cpp      |  3 ++-
 clang/unittests/Format/TokenAnnotatorTest.cpp | 20 +++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 246b29d308bfaf..1727ed93822b1b 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -570,7 +570,8 @@ void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
                                 NextTok->isOneOf(Keywords.kw_of, Keywords.kw_in,
                                                  Keywords.kw_as));
           ProbablyBracedList =
-              ProbablyBracedList || (IsCpp && NextTok->is(tok::l_paren));
+              ProbablyBracedList || (IsCpp && (PrevTok->Tok.isLiteral() ||
+                                               NextTok->is(tok::l_paren)));
 
           // If there is a comma, semicolon or right paren after the closing
           // brace, we assume this is a braced initializer list.
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index c0436d8a2e180a..1bb796fd6f5ee9 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -3278,6 +3278,26 @@ TEST_F(TokenAnnotatorTest, BraceKind) {
   EXPECT_BRACE_KIND(Tokens[10], BK_Block);
   EXPECT_TOKEN(Tokens[11], tok::r_brace, TT_StructRBrace);
   EXPECT_BRACE_KIND(Tokens[11], BK_Block);
+
+  Tokens = annotate("#define MACRO            \\\n"
+                    "  struct hash<type> {    \\\n"
+                    "    void f() { return; } \\\n"
+                    "  };");
+  ASSERT_EQ(Tokens.size(), 20u) << Tokens;
+  EXPECT_TOKEN(Tokens[8], tok::l_brace, TT_StructLBrace);
+  EXPECT_BRACE_KIND(Tokens[8], BK_Block);
+  EXPECT_TOKEN(Tokens[10], tok::identifier, TT_FunctionDeclarationName);
+  EXPECT_TOKEN(Tokens[11], tok::l_paren, TT_FunctionDeclarationLParen);
+  EXPECT_TOKEN(Tokens[13], tok::l_brace, TT_FunctionLBrace);
+  EXPECT_BRACE_KIND(Tokens[13], BK_Block);
+  EXPECT_BRACE_KIND(Tokens[16], BK_Block);
+  EXPECT_TOKEN(Tokens[17], tok::r_brace, TT_StructRBrace);
+  EXPECT_BRACE_KIND(Tokens[17], BK_Block);
+
+  Tokens = annotate("#define MEMBER(NAME) NAME{\"\"}");
+  ASSERT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_BRACE_KIND(Tokens[7], BK_BracedInit);
+  EXPECT_BRACE_KIND(Tokens[9], BK_BracedInit);
 }
 
 TEST_F(TokenAnnotatorTest, UnderstandsElaboratedTypeSpecifier) {