From 2dd58aefa50324f288ec6899b6025423bb7d6726 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 29 Jun 2001 05:25:51 +0000
Subject: [PATCH] Add a check to avoid allowing V->replaceAllUsesWith(V)

llvm-svn: 104
---
 llvm/lib/VMCore/Value.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/VMCore/Value.cpp b/llvm/lib/VMCore/Value.cpp
index 79d8e0a46205..fa3c0f60fb4f 100644
--- a/llvm/lib/VMCore/Value.cpp
+++ b/llvm/lib/VMCore/Value.cpp
@@ -43,6 +43,7 @@ Value::~Value() {
 
 void Value::replaceAllUsesWith(Value *D) {
   assert(D && "Value::replaceAllUsesWith(<null>) is invalid!");
+  assert(D != this && "V->replaceAllUsesWith(V) is NOT valid!");
   while (!Uses.empty()) {
     User *Use = Uses.front();
 #ifndef NDEBUG