[clang-format] [PR41170] Break after return type ignored with certain comments positions

Summary:
Addresses https://bugs.llvm.org/show_bug.cgi?id=41170

The AlwaysBreakAfterReturn type setting can go wrong if the line ends with a comment
```
void foo() /* comment */
```
or

```
void foo() // comment
```

It will incorrectly see such functions as Declarations and not Definitions

The following code addresses this by looking for function which end with `; <comment>` rather than just `;` or `<comment>`

Reviewers: klimek, djasper, reuk, russellmcc, owenpan, sammccall
Reviewed By: owenpan
Subscribers: lebedev.ri, cfe-commits, sammccall
Tags: #clang
Differential Revision: https://reviews.llvm.org/D60363

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@358375 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 3 deletions

diff --git a/lib/Format/TokenAnnotator.h b/lib/Format/TokenAnnotator.h
index 0422c611b4..d21df4938b 100644
--- a/lib/Format/TokenAnnotator.h
+++ b/lib/Format/TokenAnnotator.h
@@ -99,9 +99,17 @@ public:
   /// function declaration. Asserts MightBeFunctionDecl.
   bool mightBeFunctionDefinition() const {
     assert(MightBeFunctionDecl);
-    // FIXME: Line.Last points to other characters than tok::semi
-    // and tok::lbrace.
-    return !Last->isOneOf(tok::semi, tok::comment);
+    // Try to determine if the end of a stream of tokens is either the
+    // Definition or the Declaration for a function. It does this by looking for
+    // the ';' in foo(); and using that it ends with a ; to know this is the
+    // Definition, however the line could end with
+    //    foo(); /* comment */
+    // or
+    //    foo(); // comment
+    // or
+    //    foo() // comment
+    // endsWith() ignores the comment.
+    return !endsWith(tok::semi);
   }
 
   /// \c true if this line starts a namespace definition.