From 803f5fc02f73651fecc342807939066b067b65b5 Mon Sep 17 00:00:00 2001
From: Tanya Lattner <tonic@nondot.org>
Date: Tue, 28 Oct 2008 17:22:40 +0000
Subject: [PATCH] Do not allow a user to set the operand for a constant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58335 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/User.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/llvm/User.h b/include/llvm/User.h
index 570f381d1a8..919693e0829 100644
--- a/include/llvm/User.h
+++ b/include/llvm/User.h
@@ -95,6 +95,9 @@ public:
   }
   void setOperand(unsigned i, Value *Val) {
     assert(i < NumOperands && "setOperand() out of range!");
+    assert((!isa<Constant>((const Value*)this) ||
+            isa<GlobalValue>((const Value*)this)) &&
+           "Cannot mutate a constant with setOperand!");
     OperandList[i] = Val;
   }
   unsigned getNumOperands() const { return NumOperands; }