Index: clang/include/clang/Format/Format.h
===================================================================
--- clang/include/clang/Format/Format.h
+++ clang/include/clang/Format/Format.h
@@ -2018,6 +2018,19 @@
   /// clang-format aware of such cases.
   ///
   /// For example: Q_UNUSED
+  ///
+  /// Cases in switch block can be defined as StatementMacros. The behavior is
+  /// the same as 'case' in switch block.
+  ///
+  /// .. code-block:: c
+  ///   switch (x) {
+  ///   FOO:
+  ///     break;
+  ///   case 0:
+  ///     break;
+  ///   BAR(var) :
+  ///     break;
+  ///   }
   std::vector<std::string> StatementMacros;
 
   /// A vector of macros which are used to open namespace blocks.
Index: clang/lib/Format/UnwrappedLineParser.h
===================================================================
--- clang/lib/Format/UnwrappedLineParser.h
+++ clang/lib/Format/UnwrappedLineParser.h
@@ -97,7 +97,7 @@
   void parsePPEndIf();
   void parsePPUnknown();
   void readTokenWithJavaScriptASI();
-  void parseStructuralElement();
+  void parseStructuralElement(bool inLevelParsing = false);
   bool tryToParseBracedList();
   bool parseBracedList(bool ContinueOnSemicolons = false, bool IsEnum = false,
                        tok::TokenKind ClosingBraceKind = tok::r_brace);
@@ -130,7 +130,7 @@
   void parseObjCInterfaceOrImplementation();
   bool parseObjCProtocol();
   void parseJavaScriptEs6ImportExport();
-  void parseStatementMacro();
+  void parseStatementMacro(bool inLevelParsing = false);
   void parseCSharpAttribute();
   // Parse a C# generic type constraint: `where T : IComparable<T>`.
   // See:
Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -374,7 +374,8 @@
     } else if (FormatTok->getType() == TT_MacroBlockEnd) {
       kind = tok::r_brace;
     }
-
+    if (FormatTok->is(TT_StatementMacro))
+      parseStructuralElement(/*inLevelParsing=*/true);
     switch (kind) {
     case tok::comment:
       nextToken();
@@ -1040,7 +1041,7 @@
     return addUnwrappedLine();
 }
 
-void UnwrappedLineParser::parseStructuralElement() {
+void UnwrappedLineParser::parseStructuralElement(bool inLevelParsing) {
   assert(!FormatTok->is(tok::l_brace));
   if (Style.Language == FormatStyle::LK_TableGen &&
       FormatTok->is(tok::pp_include)) {
@@ -1205,7 +1206,7 @@
       }
     }
     if (Style.isCpp() && FormatTok->is(TT_StatementMacro)) {
-      parseStatementMacro();
+      parseStatementMacro(inLevelParsing);
       return;
     }
     if (Style.isCpp() && FormatTok->is(TT_NamespaceMacro)) {
@@ -2916,10 +2917,12 @@
   }
 }
 
-void UnwrappedLineParser::parseStatementMacro() {
+void UnwrappedLineParser::parseStatementMacro(bool inLevelParsing) {
   nextToken();
   if (FormatTok->is(tok::l_paren))
     parseParens();
+  if (inLevelParsing && FormatTok->is(tok::colon))
+    parseLabel();
   if (FormatTok->is(tok::semi))
     nextToken();
   addUnwrappedLine();
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -3496,6 +3496,35 @@
                getLLVMStyleWithColumns(11));
 }
 
+TEST_F(FormatTest, StatementMacroInSwitchBlock) {
+  FormatStyle Style = getLLVMStyle();
+  Style.StatementMacros.push_back("FOO");
+  verifyFormat("switch (x) {\n"
+               "FOO:\n"
+               "  break;\n"
+               "case 0:\n"
+               "  break;\n"
+               "FOO(var) :\n"
+               "  break;\n"
+               "case 1:\n"
+               "  break;\n"
+               "}",
+               Style);
+  /* This option removes the space before the StatementMacro colon */
+  Style.SpaceBeforeCtorInitializerColon = false;
+  verifyFormat("switch (x) {\n"
+               "FOO:\n"
+               "  break;\n"
+               "case 0:\n"
+               "  break;\n"
+               "FOO(var):\n"
+               "  break;\n"
+               "case 1:\n"
+               "  break;\n"
+               "}",
+               Style);
+}
+
 TEST_F(FormatTest, IndentPreprocessorDirectives) {
   FormatStyle Style = getLLVMStyle();
   Style.IndentPPDirectives = FormatStyle::PPDIS_None;