bitcode writer support for blockaddress.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85376 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 36 insertions, 8 deletions

diff --git a/lib/Bitcode/Writer/ValueEnumerator.cpp b/lib/Bitcode/Writer/ValueEnumerator.cpp
index 95746eee03..d840d4ae9f 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -223,7 +223,9 @@ void ValueEnumerator::EnumerateMetadata(const MetadataBase *MD) {
         EnumerateType(Type::getVoidTy(MD->getContext()));
     }
     return;
-  } else if (const NamedMDNode *N = dyn_cast<NamedMDNode>(MD)) {
+  }
+  
+  if (const NamedMDNode *N = dyn_cast<NamedMDNode>(MD)) {
     for(NamedMDNode::const_elem_iterator I = N->elem_begin(),
           E = N->elem_end(); I != E; ++I) {
       MetadataBase *M = *I;
@@ -274,7 +276,8 @@ void ValueEnumerator::EnumerateValue(const Value *V) {
       // graph that don't go through a global variable.
       for (User::const_op_iterator I = C->op_begin(), E = C->op_end();
            I != E; ++I)
-        EnumerateValue(*I);
+        if (!isa<BasicBlock>(*I)) // Don't enumerate BB operand to BlockAddress.
+          EnumerateValue(*I);
 
       // Finally, add the value.  Doing this could make the ValueID reference be
       // dangling, don't reuse it.
@@ -320,15 +323,20 @@ void ValueEnumerator::EnumerateOperandType(const Value *V) {
 
     // This constant may have operands, make sure to enumerate the types in
     // them.
-    for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
-      EnumerateOperandType(C->getOperand(i));
+    for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
+      const User *Op = C->getOperand(i);
+      
+      // Don't enumerate basic blocks here, this happens as operands to
+      // blockaddress.
+      if (isa<BasicBlock>(Op)) continue;
+      
+      EnumerateOperandType(cast<Constant>(Op));
+    }
 
     if (const MDNode *N = dyn_cast<MDNode>(V)) {
-      for (unsigned i = 0, e = N->getNumElements(); i != e; ++i) {
-        Value *Elem = N->getElement(i);
-        if (Elem)
+      for (unsigned i = 0, e = N->getNumElements(); i != e; ++i)
+        if (Value *Elem = N->getElement(i))
           EnumerateOperandType(Elem);
-      }
     }
   } else if (isa<MDString>(V) || isa<MDNode>(V))
     EnumerateValue(V);
@@ -397,3 +405,23 @@ void ValueEnumerator::purgeFunction() {
   Values.resize(NumModuleValues);
   BasicBlocks.clear();
 }
+
+static void IncorporateFunctionInfoGlobalBBIDs(const Function *F,
+                                 DenseMap<const BasicBlock*, unsigned> &IDMap) {
+  unsigned Counter = 0;
+  for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
+    IDMap[BB] = ++Counter;
+}
+
+/// getGlobalBasicBlockID - This returns the function-specific ID for the
+/// specified basic block.  This is relatively expensive information, so it
+/// should only be used by rare constructs such as address-of-label.
+unsigned ValueEnumerator::getGlobalBasicBlockID(const BasicBlock *BB) const {
+  unsigned &Idx = GlobalBasicBlockIDs[BB];
+  if (Idx != 0)
+    return Idx-1;
+
+  IncorporateFunctionInfoGlobalBBIDs(BB->getParent(), GlobalBasicBlockIDs);
+  return getGlobalBasicBlockID(BB);
+}
+