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

[llvmbot]

Backport d61edec

Requested by: @owenca

[llvmbot]

@HazardyKnusperkeks What do you think about merging this PR to the release branch?

[llvmbot]

@llvm/pr-subscribers-clang-format

Author: None (llvmbot)

Changes

Backport d61edec

Requested by: @owenca

---

Full diff: https://github.com/llvm/llvm-project/pull/89412.diff

2 Files Affected:

• (modified) clang/lib/Format/ContinuationIndenter.cpp (+7-1)
• (modified) clang/unittests/Format/FormatTestComments.cpp (+4)

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"

[owenca]

@tstellar is this waiting for @HazardyKnusperkeks?

[tstellar]

Hi @owenca (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.