[llvm-branch-commits] [clang] [clang-format] Correctly annotate braces in macro definition (#107352) (PR #107531)

[Tobias Hieta via llvm-branch-commits]

https://github.com/tru updated https://github.com/llvm/llvm-project/pull/107531

>From 327ca6c02f0dbf13dd6f039d30d320a7ba1456b8 Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Thu, 5 Sep 2024 23:59:11 -0700
Subject: [PATCH] [clang-format] Correctly annotate braces in macro definition
 (#107352)

This reverts commit 2d90e8f7402b0a8114978b6f014cfe76c96c94a1 and backports
commit 616a8ce6203d8c7569266bfaf163e74df1f440ad.
---
 clang/lib/Format/UnwrappedLineParser.cpp      |  6 ++++--
 clang/unittests/Format/TokenAnnotatorTest.cpp | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 60e65aaa83e9c1..7813d86ff0ea10 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.
@@ -609,8 +610,9 @@ void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
             ProbablyBracedList = NextTok->isNot(tok::l_square);
           }
 
-          // Cpp macro definition body containing nonempty braced list or block:
+          // Cpp macro definition body that is a nonempty braced list or block:
           if (IsCpp && Line->InMacroBody && PrevTok != FormatTok &&
+              !FormatTok->Previous && NextTok->is(tok::eof) &&
               // A statement can end with only `;` (simple statement), a block
               // closing brace (compound statement), or `:` (label statement).
               // If PrevTok is a block opening brace, Tok ends an empty block.
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
index db580d70058811..dd58fbc70cb91e 100644
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -3219,6 +3219,21 @@ TEST_F(TokenAnnotatorTest, BraceKind) {
   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);