From 9a37f2d96a195e0b7f28605e8b642d04c9cc30ca Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 22 Jan 2004 16:08:51 +0000
Subject: [PATCH] It doesn't make sense for one side to be const, but not the
 other.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10952 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Analysis/DSNode.h                  | 13 ++++++++-----
 include/llvm/Analysis/DSSupport.h               |  4 ++--
 include/llvm/Analysis/DataStructure/DSNode.h    | 13 ++++++++-----
 include/llvm/Analysis/DataStructure/DSSupport.h |  4 ++--
 4 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/include/llvm/Analysis/DSNode.h b/include/llvm/Analysis/DSNode.h
index f206c3e5ada..1008789046c 100644
--- a/include/llvm/Analysis/DSNode.h
+++ b/include/llvm/Analysis/DSNode.h
@@ -326,7 +326,7 @@ inline DSNode *DSNodeHandle::getNode() const {
   return HandleForwarding();
 }
 
-inline void DSNodeHandle::setNode(DSNode *n) {
+inline void DSNodeHandle::setNode(DSNode *n) const {
   assert(!n || !n->getForwardNode() && "Cannot set node to a forwarded node!");
   if (N) N->NumReferrers--;
   N = n;
@@ -377,11 +377,14 @@ inline void DSNodeHandle::addEdgeTo(unsigned Off, const DSNodeHandle &Node) {
 /// mergeWith - Merge the logical node pointed to by 'this' with the node
 /// pointed to by 'N'.
 ///
-inline void DSNodeHandle::mergeWith(const DSNodeHandle &Node) {
-  if (N != 0)
+inline void DSNodeHandle::mergeWith(const DSNodeHandle &Node) const {
+  if (!isNull())
     getNode()->mergeWith(Node, Offset);
-  else     // No node to merge with, so just point to Node
-    *this = Node;
+  else {   // No node to merge with, so just point to Node
+    Offset = 0;
+    setNode(Node.getNode());
+    Offset = Node.getOffset();
+  }
 }
 
 } // End llvm namespace
diff --git a/include/llvm/Analysis/DSSupport.h b/include/llvm/Analysis/DSSupport.h
index 15d948f897c..da8afa5a875 100644
--- a/include/llvm/Analysis/DSSupport.h
+++ b/include/llvm/Analysis/DSSupport.h
@@ -93,7 +93,7 @@ public:
   inline DSNode *getNode() const;  // Defined inline in DSNode.h
   unsigned getOffset() const { return Offset; }
 
-  inline void setNode(DSNode *N);  // Defined inline in DSNode.h
+  inline void setNode(DSNode *N) const;  // Defined inline in DSNode.h
   void setOffset(unsigned O) {
     //assert((!N || Offset < N->Size || (N->Size == 0 && Offset == 0) ||
     //       !N->ForwardNH.isNull()) && "Node handle offset out of range!");
@@ -108,7 +108,7 @@ public:
   /// mergeWith - Merge the logical node pointed to by 'this' with the node
   /// pointed to by 'N'.
   ///
-  void mergeWith(const DSNodeHandle &N);
+  void mergeWith(const DSNodeHandle &N) const;
 
   // hasLink - Return true if there is a link at the specified offset...
   inline bool hasLink(unsigned Num) const;
diff --git a/include/llvm/Analysis/DataStructure/DSNode.h b/include/llvm/Analysis/DataStructure/DSNode.h
index f206c3e5ada..1008789046c 100644
--- a/include/llvm/Analysis/DataStructure/DSNode.h
+++ b/include/llvm/Analysis/DataStructure/DSNode.h
@@ -326,7 +326,7 @@ inline DSNode *DSNodeHandle::getNode() const {
   return HandleForwarding();
 }
 
-inline void DSNodeHandle::setNode(DSNode *n) {
+inline void DSNodeHandle::setNode(DSNode *n) const {
   assert(!n || !n->getForwardNode() && "Cannot set node to a forwarded node!");
   if (N) N->NumReferrers--;
   N = n;
@@ -377,11 +377,14 @@ inline void DSNodeHandle::addEdgeTo(unsigned Off, const DSNodeHandle &Node) {
 /// mergeWith - Merge the logical node pointed to by 'this' with the node
 /// pointed to by 'N'.
 ///
-inline void DSNodeHandle::mergeWith(const DSNodeHandle &Node) {
-  if (N != 0)
+inline void DSNodeHandle::mergeWith(const DSNodeHandle &Node) const {
+  if (!isNull())
     getNode()->mergeWith(Node, Offset);
-  else     // No node to merge with, so just point to Node
-    *this = Node;
+  else {   // No node to merge with, so just point to Node
+    Offset = 0;
+    setNode(Node.getNode());
+    Offset = Node.getOffset();
+  }
 }
 
 } // End llvm namespace
diff --git a/include/llvm/Analysis/DataStructure/DSSupport.h b/include/llvm/Analysis/DataStructure/DSSupport.h
index 15d948f897c..da8afa5a875 100644
--- a/include/llvm/Analysis/DataStructure/DSSupport.h
+++ b/include/llvm/Analysis/DataStructure/DSSupport.h
@@ -93,7 +93,7 @@ public:
   inline DSNode *getNode() const;  // Defined inline in DSNode.h
   unsigned getOffset() const { return Offset; }
 
-  inline void setNode(DSNode *N);  // Defined inline in DSNode.h
+  inline void setNode(DSNode *N) const;  // Defined inline in DSNode.h
   void setOffset(unsigned O) {
     //assert((!N || Offset < N->Size || (N->Size == 0 && Offset == 0) ||
     //       !N->ForwardNH.isNull()) && "Node handle offset out of range!");
@@ -108,7 +108,7 @@ public:
   /// mergeWith - Merge the logical node pointed to by 'this' with the node
   /// pointed to by 'N'.
   ///
-  void mergeWith(const DSNodeHandle &N);
+  void mergeWith(const DSNodeHandle &N) const;
 
   // hasLink - Return true if there is a link at the specified offset...
   inline bool hasLink(unsigned Num) const;