From 2dfd238c4be1231de1ff6cbd7f2598349fde25c8 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Thu, 26 Sep 2019 17:38:47 +0000
Subject: [PATCH] DAGISelMatcherOpt - TGParser::ParseOperation - silence static
 analyzer cast_or_null<CheckTypeMatcher> null dereference warning. NFCI.

The static analyzer is warning about a potential null dereference, replace with an null/isa assertion and cast<CheckTypeMatcher>.

llvm-svn: 373001
---
 utils/TableGen/DAGISelMatcherOpt.cpp | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/utils/TableGen/DAGISelMatcherOpt.cpp b/utils/TableGen/DAGISelMatcherOpt.cpp
index 7d51b076937..6746fdd676a 100644
--- a/utils/TableGen/DAGISelMatcherOpt.cpp
+++ b/utils/TableGen/DAGISelMatcherOpt.cpp
@@ -409,13 +409,14 @@ static void FactorNodes(std::unique_ptr<Matcher> &InputMatcherPtr) {
     DenseMap<unsigned, unsigned> TypeEntry;
     SmallVector<std::pair<MVT::SimpleValueType, Matcher*>, 8> Cases;
     for (unsigned i = 0, e = NewOptionsToMatch.size(); i != e; ++i) {
-      CheckTypeMatcher *CTM =
-        cast_or_null<CheckTypeMatcher>(FindNodeWithKind(NewOptionsToMatch[i],
-                                                        Matcher::CheckType));
+      Matcher* M = FindNodeWithKind(NewOptionsToMatch[i], Matcher::CheckType);
+      assert(M && isa<CheckTypeMatcher>(M) && "Unknown Matcher type");
+
+      auto *CTM = cast<CheckTypeMatcher>(M);
       Matcher *MatcherWithoutCTM = NewOptionsToMatch[i]->unlinkNode(CTM);
       MVT::SimpleValueType CTMTy = CTM->getType();
       delete CTM;
-      
+
       unsigned &Entry = TypeEntry[CTMTy];
       if (Entry != 0) {
         // If we have unfactored duplicate types, then we should factor them.