Revert r122114 (CallbackVH observing use-list changes) because it caused severe slowdowns on the Linux self-host configuration.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122279 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 38 deletions

diff --git a/lib/VMCore/Value.cpp b/lib/VMCore/Value.cpp
index 3c32c56..76cfb90 100644
--- a/lib/VMCore/Value.cpp
+++ b/lib/VMCore/Value.cpp
@@ -281,16 +281,6 @@ void Value::takeName(Value *V) {
 }
 
 
-/// addUse - This method should only be used by the Use class.
-///
-void Value::addUse(Use &U) {
-  U.addToList(&UseList);
-  
-  // Notify all ValueHandles (if present) that this value added a Use.
-  if (HasValueHandle)
-    ValueHandleBase::ValueAddedUse(U);
-}
-
 // uncheckedReplaceAllUsesWith - This is exactly the same as replaceAllUsesWith,
 // except that it doesn't have all of the asserts.  The asserts fail because we
 // are half-way done resolving types, which causes some types to exist as two
@@ -579,34 +569,6 @@ void ValueHandleBase::ValueIsDeleted(Value *V) {
   }
 }
 
-void ValueHandleBase::ValueAddedUse(Use &U) {
-  assert(U->HasValueHandle && "Should only be called if ValueHandles present");
-
-  // Get the linked list base, which is guaranteed to exist since the
-  // HasValueHandle flag is set.
-  LLVMContextImpl *pImpl = U->getContext().pImpl;
-  ValueHandleBase *Entry = pImpl->ValueHandles[U.get()];
-
-  assert(Entry && "Value bit set but no entries exist");
-
-  // We use a local ValueHandleBase as an iterator so that
-  // ValueHandles can add and remove themselves from the list without
-  // breaking our iteration.  This is not really an AssertingVH; we
-  // just have to give ValueHandleBase some kind.
-  for (ValueHandleBase Iterator(Assert, *Entry); Entry; Entry = Iterator.Next) {
-    Iterator.RemoveFromUseList();
-    Iterator.AddToExistingUseListAfter(Entry);
-    assert(Entry->Next == &Iterator && "Loop invariant broken.");
-
-    switch (Entry->getKind()) {
-    default:
-      break;
-    case Callback:
-      static_cast<CallbackVH*>(Entry)->addedUse(U);
-      break;
-    }
-  }
-}
 
 void ValueHandleBase::ValueIsRAUWd(Value *Old, Value *New) {
   assert(Old->HasValueHandle &&"Should only be called if ValueHandles present");