clang-format: Allow splitting the line after /**/-comments.

While it might change the meaning of the comment in rare circumstances,
it is better than violating the column limit.

llvm-svn: 270975

clang/lib/Format/TokenAnnotator.cpp

@@ -1826,6 +1826,8 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
     return 500;
   if (Left.isOneOf(tok::kw_class, tok::kw_struct))
     return 5000;
+  if (Left.is(tok::comment))
+    return 1000;
 
   if (Left.isOneOf(TT_RangeBasedForLoopColon, TT_InheritanceColon))
     return 2;
@@ -2464,7 +2466,7 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
        Left.getPrecedence() == prec::Assignment))
     return true;
   return Left.isOneOf(tok::comma, tok::coloncolon, tok::semi, tok::l_brace,
-                      tok::kw_class, tok::kw_struct) ||
+                      tok::kw_class, tok::kw_struct, tok::comment) ||
          Right.isMemberAccess() ||
          Right.isOneOf(TT_TrailingReturnArrow, TT_LambdaArrow, tok::lessless,
                        tok::colon, tok::l_square, tok::at) ||

clang/unittests/Format/FormatTest.cpp

@@ -1143,6 +1143,8 @@ TEST_F(FormatTest, UnderstandsBlockComments) {
              "                      aaaaaaaaaaaaaaaaaa  ,\n"
              "    aaaaaaaaaaaaaaaaaa) {   /*aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa*/\n"
              "}"));
+  verifyFormat("f(/* aaaaaaaaaaaaaaaaaa = */\n"
+               "  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa);");
 
   FormatStyle NoBinPacking = getLLVMStyle();
   NoBinPacking.BinPackParameters = false;