[llvm-branch-commits] [clang] release/18.x: [clang-format] Fix a regression in ContinuationIndenter (#88414) (PR #89412)

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https://github.com/llvmbot updated https://github.com/llvm/llvm-project/pull/89412

>From 6dbaa89433f785799797d14e4c36805998fc6bad Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Fri, 12 Apr 2024 10:12:24 -0700
Subject: [PATCH] [clang-format] Fix a regression in ContinuationIndenter
 (#88414)

Commit d06b92391513 caused a regression that breaks after a block
comment adjacent to a function paramter that follows.

Fixes #86573.

(cherry picked from commit d61edecbfd099143e0e2617505fec921524938f8)
---
 clang/lib/Format/ContinuationIndenter.cpp     | 8 +++++++-
 clang/unittests/Format/FormatTestComments.cpp | 4 ++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
index a3eb9138b21833..53cd169b05904a 100644
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -674,7 +674,13 @@ void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
         // arguments to function calls. We do this by ensuring that either all
         // arguments (including any lambdas) go on the same line as the function
         // call, or we break before the first argument.
-        auto PrevNonComment = Current.getPreviousNonComment();
+        const auto *Prev = Current.Previous;
+        if (!Prev)
+          return false;
+        // For example, `/*Newline=*/false`.
+        if (Prev->is(TT_BlockComment) && Current.SpacesRequiredBefore == 0)
+          return false;
+        const auto *PrevNonComment = Current.getPreviousNonComment();
         if (!PrevNonComment || PrevNonComment->isNot(tok::l_paren))
           return false;
         if (Current.isOneOf(tok::comment, tok::l_paren, TT_LambdaLSquare))
diff --git a/clang/unittests/Format/FormatTestComments.cpp b/clang/unittests/Format/FormatTestComments.cpp
index c249f4d9333fd0..d7c432ed031d34 100644
--- a/clang/unittests/Format/FormatTestComments.cpp
+++ b/clang/unittests/Format/FormatTestComments.cpp
@@ -376,6 +376,10 @@ TEST_F(FormatTestComments, RemovesTrailingWhitespaceOfComments) {
 TEST_F(FormatTestComments, UnderstandsBlockComments) {
   verifyFormat("f(/*noSpaceAfterParameterNamingComment=*/true);");
   verifyFormat("void f() { g(/*aaa=*/x, /*bbb=*/!y, /*c=*/::c); }");
+  verifyFormat("fooooooooooooooooooooooooooooo(\n"
+               "    /*qq_=*/move(q), [this, b](bar<void(uint32_t)> b) {},\n"
+               "    c);",
+               getLLVMStyleWithColumns(60));
   EXPECT_EQ("f(aaaaaaaaaaaaaaaaaaaaaaaaa, /* Trailing comment for aa... */\n"
             "  bbbbbbbbbbbbbbbbbbbbbbbbb);",
             format("f(aaaaaaaaaaaaaaaaaaaaaaaaa ,   \\\n"