Revert 85678/85680. The decision is to stay with the current form of

indirectbr, thus we don't need "blockaddr(@func, null)".  Eliminate it
for simplicity.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85699 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 8 insertions, 10 deletions

diff --git a/lib/VMCore/AsmWriter.cpp b/lib/VMCore/AsmWriter.cpp
index df1d19b..9a803a1 100644
--- a/lib/VMCore/AsmWriter.cpp
+++ b/lib/VMCore/AsmWriter.cpp
@@ -1065,10 +1065,7 @@ static void WriteConstantInt(raw_ostream &Out, const Constant *CV,
     Out << "blockaddress(";
     WriteAsOperandInternal(Out, BA->getFunction(), &TypePrinter, Machine);
     Out << ", ";
-    if (BA->getBasicBlock())
-      WriteAsOperandInternal(Out, BA->getBasicBlock(), &TypePrinter, Machine);
-    else
-      Out << "null";
+    WriteAsOperandInternal(Out, BA->getBasicBlock(), &TypePrinter, Machine);
     Out << ")";
     return;
   }
diff --git a/lib/VMCore/BasicBlock.cpp b/lib/VMCore/BasicBlock.cpp
index c609ef8..23d0557 100644
--- a/lib/VMCore/BasicBlock.cpp
+++ b/lib/VMCore/BasicBlock.cpp
@@ -63,13 +63,15 @@ BasicBlock::~BasicBlock() {
   // hanging off the block, or an undefined use of the block (source code
   // expecting the address of a label to keep the block alive even though there
   // is no indirect branch).  Handle these cases by zapping the BlockAddress
-  // nodes, replacing them with BlockAddress(F, NULL).  There are no other
-  // possible uses at this point.
+  // nodes.  There are no other possible uses at this point.
   if (hasAddressTaken()) {
     assert(!use_empty() && "There should be at least one blockaddress!");
+    Constant *Replacement =
+      ConstantInt::get(llvm::Type::getInt32Ty(getContext()), 1);
     while (!use_empty()) {
       BlockAddress *BA = cast<BlockAddress>(use_back());
-      BA->replaceAllUsesWith(BlockAddress::get(BA->getFunction(), 0));
+      BA->replaceAllUsesWith(ConstantExpr::getIntToPtr(Replacement,
+                                                       BA->getType()));
       BA->destroyConstant();
     }
   }
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index e0adf9d..2d3d71b 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -1045,7 +1045,7 @@ BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
            &Op<0>(), 2) {
   Op<0>() = F;
   Op<1>() = BB;
-  if (BB) BB->AdjustBlockAddressRefCount(1);
+  BB->AdjustBlockAddressRefCount(1);
 }
 
 
@@ -1054,8 +1054,7 @@ BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
 void BlockAddress::destroyConstant() {
   getFunction()->getType()->getContext().pImpl
     ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
-  if (BasicBlock *BB = getBasicBlock())
-    BB->AdjustBlockAddressRefCount(-1);
+  getBasicBlock()->AdjustBlockAddressRefCount(-1);
   destroyConstantImpl();
 }