Comment parsing: when comment ranges are deserialized from multiple modules,

correctly order comments in SourceManager::isBeforeInTranslationUnit() order

Unfortunately, this is not as simple as it was implemented previously, and
actually requires doing a merge sort.

llvm-svn: 204936

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index c02150a6bc6..1e55521b87c 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -63,6 +63,13 @@ enum FloatingRank {
 RawComment *ASTContext::getRawCommentForDeclNoCache(const Decl *D) const {
   if (!CommentsLoaded && ExternalSource) {
     ExternalSource->ReadComments();
+
+#ifndef NDEBUG
+    ArrayRef<RawComment *> RawComments = Comments.getComments();
+    assert(std::is_sorted(RawComments.begin(), RawComments.end(),
+                          BeforeThanCompare<RawComment>(SourceMgr)));
+#endif
+
     CommentsLoaded = true;
   }