From 0a0193edf9152bdc47a49a1a513d6e9cbf723131 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 4 Aug 2009 04:31:02 +0000
Subject: [PATCH] switch ValueMap to using AssertingVH.  This is an old patch I
 had laying around in a tree I forgot about.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78048 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Value.h                 |  2 +-
 include/llvm/ValueSymbolTable.h      |  3 ++-
 lib/Bitcode/Writer/BitcodeWriter.cpp |  2 +-
 lib/VMCore/Value.cpp                 | 16 ++++++++--------
 4 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/include/llvm/Value.h b/include/llvm/Value.h
index b1db1ce3e1e..a7f8774e036 100644
--- a/include/llvm/Value.h
+++ b/include/llvm/Value.h
@@ -38,7 +38,7 @@ class TypeSymbolTable;
 template<typename ValueTy> class StringMapEntry;
 template <typename ValueTy = Value>
 class AssertingVH;
-typedef StringMapEntry<Value*> ValueName;
+typedef StringMapEntry<AssertingVH<> > ValueName;
 class raw_ostream;
 class AssemblyAnnotationWriter;
 class ValueHandleBase;
diff --git a/include/llvm/ValueSymbolTable.h b/include/llvm/ValueSymbolTable.h
index 4f8ebe80017..9b4ccbaf8f3 100644
--- a/include/llvm/ValueSymbolTable.h
+++ b/include/llvm/ValueSymbolTable.h
@@ -17,6 +17,7 @@
 #include "llvm/Value.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ValueHandle.h"
 
 namespace llvm {
   template<typename ValueSubClass, typename ItemParentClass>
@@ -44,7 +45,7 @@ class ValueSymbolTable {
 /// @{
 public:
   /// @brief A mapping of names to values.
-  typedef StringMap<Value*> ValueMap;
+  typedef StringMap<AssertingVH<> > ValueMap;
 
   /// @brief An iterator over a ValueMap.
   typedef ValueMap::iterator iterator;
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 4b925163954..724e1aeb15c 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1083,7 +1083,7 @@ static void WriteValueSymbolTable(const ValueSymbolTable &VST,
     // VST_ENTRY:   [valueid, namechar x N]
     // VST_BBENTRY: [bbid, namechar x N]
     unsigned Code;
-    if (isa<BasicBlock>(SI->getValue())) {
+    if (isa<BasicBlock>(*SI->getValue())) {
       Code = bitc::VST_CODE_BBENTRY;
       if (isChar6)
         AbbrevToUse = VST_BBENTRY_6_ABBREV;
diff --git a/lib/VMCore/Value.cpp b/lib/VMCore/Value.cpp
index 2cdd55217cc..8710b9461e8 100644
--- a/lib/VMCore/Value.cpp
+++ b/lib/VMCore/Value.cpp
@@ -57,6 +57,14 @@ Value::Value(const Type *ty, unsigned scid)
 }
 
 Value::~Value() {
+  // If this value is named, destroy the name.  This should not be in a symtab
+  // at this point.
+  if (Name)
+    Name->Destroy();
+  
+  // There should be no uses of this object anymore, remove it.
+  LeakDetector::removeGarbageObject(this);
+  
   // Notify all ValueHandles (if present) that this value is going away.
   if (HasValueHandle)
     ValueHandleBase::ValueIsDeleted(this);
@@ -76,14 +84,6 @@ Value::~Value() {
   }
 #endif
   assert(use_empty() && "Uses remain when a value is destroyed!");
-
-  // If this value is named, destroy the name.  This should not be in a symtab
-  // at this point.
-  if (Name)
-    Name->Destroy();
-  
-  // There should be no uses of this object anymore, remove it.
-  LeakDetector::removeGarbageObject(this);
 }
 
 /// hasNUses - Return true if this Value has exactly N users.