Refactor into a separate utility function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127832 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/Local.cpp

@@ -22,6 +22,8 @@
 #include "llvm/IntrinsicInst.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/Analysis/DIBuilder.h"
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/InstructionSimplify.h"
@@ -755,3 +757,29 @@ unsigned llvm::getOrEnforceKnownAlignment(Value *V, unsigned PrefAlign,
   return Align;
 }
 
+///===---------------------------------------------------------------------===//
+///  Dbg Intrinsic utilities
+///
+
+/// Inserts a llvm.dbg.value instrinsic before the stores to an alloca'd value
+/// that has an associated llvm.dbg.decl intrinsic.
+bool llvm::ConvertDebugDeclareToDebugValue(DbgDeclareInst *DDI,
+                                           StoreInst *SI, DIBuilder &Builder) {
+  DIVariable DIVar(DDI->getVariable());
+  if (!DIVar.Verify())
+    return false;
+
+  Instruction *DbgVal = 
+    Builder.insertDbgValueIntrinsic(SI->getOperand(0), 0,
+                                    DIVar, SI);
+  
+  // Propagate any debug metadata from the store onto the dbg.value.
+  DebugLoc SIDL = SI->getDebugLoc();
+  if (!SIDL.isUnknown())
+    DbgVal->setDebugLoc(SIDL);
+  // Otherwise propagate debug metadata from dbg.declare.
+  else
+    DbgVal->setDebugLoc(DDI->getDebugLoc());
+  return true;
+}
+