[clang] [clang-format] Don't crash on incomplete template declaration (PR #173433)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-format

Author: Björn Schäpers (HazardyKnusperkeks)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/173433.diff


2 Files Affected:

- (modified) clang/lib/Format/TokenAnnotator.cpp (+2) 
- (modified) clang/unittests/Format/FormatTest.cpp (+4) 


``````````diff
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index f6341ff0305a9..376afa52cab20 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3743,6 +3743,8 @@ static FormatToken *getFunctionName(const AnnotatedLine &Line,
         return nullptr;
 
       Tok = Tok->MatchingParen;
+      if (!Tok)
+        break;
 
       continue;
     }
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 5cdac66d1dcbd..068bd22efcf99 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -29053,6 +29053,10 @@ TEST_F(FormatTest, KeywordedFunctionLikeMacros) {
                Style);
 }
 
+TEST_F(FormatTest, DoesNotCrashIncompleteCode) {
+  verifyNoCrash("template <");
+}
+
 } // namespace
 } // namespace test
 } // namespace format

``````````

</details>


https://github.com/llvm/llvm-project/pull/173433