[clang-format] Add new style option IndentGotoLabels

Summary:
This option determines whether goto labels are indented according to scope. Setting this option to false causes goto labels to be flushed to the left.
This is mostly copied from [[ http://lists.llvm.org/pipermail/cfe-dev/2015-September/045014.html | this patch ]] submitted by Christian Neukirchen that didn't make its way into trunk.

```
     true:                                  false:
     int f() {                      vs.     int f() {
       if (foo()) {                           if (foo()) {
       label1:                              label1:
         bar();                                 bar();
       }                                      }
     label2:                                label2:
       return 1;                              return 1;
     }                                      }
```

Reviewers: klimek, MyDeveloperDay

Reviewed By: MyDeveloperDay

Subscribers: cfe-commits

Tags: #clang, #clang-tools-extra

Patch by: tetsuo-cpp

Differential Revision: https://reviews.llvm.org/D67037

llvm-svn: 371719

1 files changed, 25 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 7869cc568ae..f1a1160fa14 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -1408,6 +1408,30 @@ TEST_F(FormatTest, FormatsLabels) {
                "test_label:;\n"
                "  int i = 0;\n"
                "}");
+  FormatStyle Style = getLLVMStyle();
+  Style.IndentGotoLabels = false;
+  verifyFormat("void f() {\n"
+               "  some_code();\n"
+               "test_label:\n"
+               "  some_other_code();\n"
+               "  {\n"
+               "    some_more_code();\n"
+               "another_label:\n"
+               "    some_more_code();\n"
+               "  }\n"
+               "}",
+               Style);
+  verifyFormat("{\n"
+               "  some_code();\n"
+               "test_label:\n"
+               "  some_other_code();\n"
+               "}",
+               Style);
+  verifyFormat("{\n"
+               "  some_code();\n"
+               "test_label:;\n"
+               "  int i = 0;\n"
+               "}");
 }
 
 //===----------------------------------------------------------------------===//
@@ -11779,6 +11803,7 @@ TEST_F(FormatTest, ParsesConfigurationBools) {
   CHECK_PARSE_BOOL_FIELD(DerivePointerAlignment, "DerivePointerBinding");
   CHECK_PARSE_BOOL(DisableFormat);
   CHECK_PARSE_BOOL(IndentCaseLabels);
+  CHECK_PARSE_BOOL(IndentGotoLabels);
   CHECK_PARSE_BOOL(IndentWrappedFunctionNames);
   CHECK_PARSE_BOOL(KeepEmptyLinesAtTheStartOfBlocks);
   CHECK_PARSE_BOOL(ObjCSpaceAfterProperty);