From dd9f7c930083fcc032fa1d2b5c8a9330101f6849 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 5 Jan 2009 18:19:46 +0000
Subject: [PATCH] reject PR3281:crash09.ll with this diagnostic:

llvm-as: crash09.ll:3:1: self referential type is invalid
type %0
^



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61720 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/AsmParser/LLParser.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index da8cb4da23e..27dbf8871a6 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -238,6 +238,9 @@ bool LLParser::ParseUnnamedType() {
   std::map<unsigned, std::pair<PATypeHolder, LocTy> >::iterator
     FI = ForwardRefTypeIDs.find(TypeID);
   if (FI != ForwardRefTypeIDs.end()) {
+    if (FI->second.first.get() == Ty)
+      return Error(TypeLoc, "self referential type is invalid");
+    
     cast<DerivedType>(FI->second.first.get())->refineAbstractTypeTo(Ty);
     Ty = FI->second.first.get();
     ForwardRefTypeIDs.erase(FI);
@@ -275,6 +278,9 @@ bool LLParser::ParseNamedType() {
   std::map<std::string, std::pair<PATypeHolder, LocTy> >::iterator
   FI = ForwardRefTypes.find(Name);
   if (FI != ForwardRefTypes.end()) {
+    if (FI->second.first.get() == Ty)
+      return Error(NameLoc, "self referential type is invalid");
+
     cast<DerivedType>(FI->second.first.get())->refineAbstractTypeTo(Ty);
     Ty = FI->second.first.get();
     ForwardRefTypes.erase(FI);
-- 
2.11.0