From 5ae6170fc29271ea76c18c09ef102f8613ae70fa Mon Sep 17 00:00:00 2001
From: Mehdi Amini <mehdi.amini@apple.com>
Date: Fri, 23 Dec 2016 02:20:09 +0000
Subject: MetadataLoader: Add an assertion for the implicit invariant of
 PlaceHolder while loading Metadata (NFC)

llvm-svn: 290408
---
 llvm/lib/Bitcode/Reader/MetadataLoader.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'llvm/lib/Bitcode/Reader/MetadataLoader.cpp')

diff --git a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
index 1cfa1a82182..93212b0aa77 100644
--- a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
+++ b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
@@ -372,8 +372,14 @@ DistinctMDOperandPlaceholder &PlaceholderQueue::getPlaceholderOp(unsigned ID) {
 
 void PlaceholderQueue::flush(BitcodeReaderMetadataList &MetadataList) {
   while (!PHs.empty()) {
-    PHs.front().replaceUseWith(
-        MetadataList.getMetadataFwdRef(PHs.front().getID()));
+    auto *MD = MetadataList.getMetadataFwdRef(PHs.front().getID());
+#ifndef NDEBUG
+    if (auto MDN = dyn_cast<MDNode>(MD)) {
+      assert(MDN->isResolved() &&
+             "Flushing Placeholder while cycles aren't resolved");
+    }
+#endif
+    PHs.front().replaceUseWith(MD);
     PHs.pop_front();
   }
 }
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