From 6f884e07c57809d8a3af4f6374797fbfaf019382 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 9 Mar 2009 05:50:45 +0000
Subject: [PATCH] make GlobalValue::removeDeadConstantUsers() const.

llvm-svn: 66403
---
 llvm/include/llvm/GlobalValue.h |  2 +-
 llvm/lib/VMCore/Globals.cpp     | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/llvm/include/llvm/GlobalValue.h b/llvm/include/llvm/GlobalValue.h
index 33f50c907b87..45528b2713f2 100644
--- a/llvm/include/llvm/GlobalValue.h
+++ b/llvm/include/llvm/GlobalValue.h
@@ -205,7 +205,7 @@ public:
   /// off of this global value, remove them.  This method is useful for clients
   /// that want to check to see if a global is unused, but don't want to deal
   /// with potentially dead constants hanging off of the globals.
-  void removeDeadConstantUsers();
+  void removeDeadConstantUsers() const;
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const GlobalValue *) { return true; }
diff --git a/llvm/lib/VMCore/Globals.cpp b/llvm/lib/VMCore/Globals.cpp
index de1b247150ea..5abe1f9ac40d 100644
--- a/llvm/lib/VMCore/Globals.cpp
+++ b/llvm/lib/VMCore/Globals.cpp
@@ -28,17 +28,17 @@ using namespace llvm;
 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
 /// it.  This involves recursively eliminating any dead users of the
 /// constantexpr.
-static bool removeDeadUsersOfConstant(Constant *C) {
+static bool removeDeadUsersOfConstant(const Constant *C) {
   if (isa<GlobalValue>(C)) return false; // Cannot remove this
 
   while (!C->use_empty()) {
-    Constant *User = dyn_cast<Constant>(C->use_back());
+    const Constant *User = dyn_cast<Constant>(C->use_back());
     if (!User) return false; // Non-constant usage;
     if (!removeDeadUsersOfConstant(User))
       return false; // Constant wasn't dead
   }
 
-  C->destroyConstant();
+  const_cast<Constant*>(C)->destroyConstant();
   return true;
 }
 
@@ -46,11 +46,11 @@ static bool removeDeadUsersOfConstant(Constant *C) {
 /// off of this global value, remove them.  This method is useful for clients
 /// that want to check to see if a global is unused, but don't want to deal
 /// with potentially dead constants hanging off of the globals.
-void GlobalValue::removeDeadConstantUsers() {
-  Value::use_iterator I = use_begin(), E = use_end();
-  Value::use_iterator LastNonDeadUser = E;
+void GlobalValue::removeDeadConstantUsers() const {
+  Value::use_const_iterator I = use_begin(), E = use_end();
+  Value::use_const_iterator LastNonDeadUser = E;
   while (I != E) {
-    if (Constant *User = dyn_cast<Constant>(*I)) {
+    if (const Constant *User = dyn_cast<Constant>(*I)) {
       if (!removeDeadUsersOfConstant(User)) {
         // If the constant wasn't dead, remember that this was the last live use
         // and move on to the next constant.