Update llvm to r84119.

1 files changed, 720 insertions, 479 deletions

diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 9eecc33..7bb7e9b 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -18,12 +18,13 @@
 #include "llvm/Intrinsics.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/Instructions.h"
+#include "llvm/LLVMContext.h"
 #include "llvm/Module.h"
 #include "llvm/Analysis/ValueTracking.h"
+#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/DebugLoc.h"
-#include "llvm/Support/Streams.h"
-
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 using namespace llvm::dwarf;
 
@@ -32,18 +33,12 @@ using namespace llvm::dwarf;
 //===----------------------------------------------------------------------===//
 
 /// ValidDebugInfo - Return true if V represents valid debug info value.
-bool DIDescriptor::ValidDebugInfo(Value *V, CodeGenOpt::Level OptLevel) {
-  if (!V)
-    return false;
-
-  GlobalVariable *GV = dyn_cast<GlobalVariable>(V->stripPointerCasts());
-  if (!GV)
-    return false;
-
-  if (!GV->hasInternalLinkage () && !GV->hasLinkOnceLinkage())
+/// FIXME : Add DIDescriptor.isValid()
+bool DIDescriptor::ValidDebugInfo(MDNode *N, CodeGenOpt::Level OptLevel) {
+  if (!N)
     return false;
 
-  DIDescriptor DI(GV);
+  DIDescriptor DI(N);
 
   // Check current version. Allow Version6 for now.
   unsigned Version = DI.getVersion();
@@ -53,13 +48,13 @@ bool DIDescriptor::ValidDebugInfo(Value *V, CodeGenOpt::Level OptLevel) {
   unsigned Tag = DI.getTag();
   switch (Tag) {
   case DW_TAG_variable:
-    assert(DIVariable(GV).Verify() && "Invalid DebugInfo value");
+    assert(DIVariable(N).Verify() && "Invalid DebugInfo value");
     break;
   case DW_TAG_compile_unit:
-    assert(DICompileUnit(GV).Verify() && "Invalid DebugInfo value");
+    assert(DICompileUnit(N).Verify() && "Invalid DebugInfo value");
     break;
   case DW_TAG_subprogram:
-    assert(DISubprogram(GV).Verify() && "Invalid DebugInfo value");
+    assert(DISubprogram(N).Verify() && "Invalid DebugInfo value");
     break;
   case DW_TAG_lexical_block:
     // FIXME: This interfers with the quality of generated code during
@@ -74,84 +69,75 @@ bool DIDescriptor::ValidDebugInfo(Value *V, CodeGenOpt::Level OptLevel) {
   return true;
 }
 
-DIDescriptor::DIDescriptor(GlobalVariable *GV, unsigned RequiredTag) {
-  DbgGV = GV;
-  
-  // If this is non-null, check to see if the Tag matches. If not, set to null.
-  if (GV && getTag() != RequiredTag)
-    DbgGV = 0;
-}
+DIDescriptor::DIDescriptor(MDNode *N, unsigned RequiredTag) {
+  DbgNode = N;
 
-const std::string &
-DIDescriptor::getStringField(unsigned Elt, std::string &Result) const {
-  if (DbgGV == 0) {
-    Result.clear();
-    return Result;
+  // If this is non-null, check to see if the Tag matches. If not, set to null.
+  if (N && getTag() != RequiredTag) {
+    DbgNode = 0;
   }
+}
 
-  Constant *C = DbgGV->getInitializer();
-  if (C == 0 || Elt >= C->getNumOperands()) {
-    Result.clear();
-    return Result;
-  }
+const char *
+DIDescriptor::getStringField(unsigned Elt) const {
+  if (DbgNode == 0)
+    return NULL;
 
-  // Fills in the string if it succeeds
-  if (!GetConstantStringInfo(C->getOperand(Elt), Result))
-    Result.clear();
+  if (Elt < DbgNode->getNumElements())
+    if (MDString *MDS = dyn_cast_or_null<MDString>(DbgNode->getElement(Elt)))
+      return MDS->getString().data();
 
-  return Result;
+  return NULL;
 }
 
 uint64_t DIDescriptor::getUInt64Field(unsigned Elt) const {
-  if (DbgGV == 0) return 0;
-
-  Constant *C = DbgGV->getInitializer();
-  if (C == 0 || Elt >= C->getNumOperands())
+  if (DbgNode == 0)
     return 0;
 
-  if (ConstantInt *CI = dyn_cast<ConstantInt>(C->getOperand(Elt)))
-    return CI->getZExtValue();
+  if (Elt < DbgNode->getNumElements())
+    if (ConstantInt *CI = dyn_cast<ConstantInt>(DbgNode->getElement(Elt)))
+      return CI->getZExtValue();
+
   return 0;
 }
 
 DIDescriptor DIDescriptor::getDescriptorField(unsigned Elt) const {
-  if (DbgGV == 0) return DIDescriptor();
-
-  Constant *C = DbgGV->getInitializer();
-  if (C == 0 || Elt >= C->getNumOperands())
+  if (DbgNode == 0)
     return DIDescriptor();
 
-  C = C->getOperand(Elt);
-  return DIDescriptor(dyn_cast<GlobalVariable>(C->stripPointerCasts()));
+  if (Elt < DbgNode->getNumElements() && DbgNode->getElement(Elt))
+    return DIDescriptor(dyn_cast<MDNode>(DbgNode->getElement(Elt)));
+
+  return DIDescriptor();
 }
 
 GlobalVariable *DIDescriptor::getGlobalVariableField(unsigned Elt) const {
-  if (DbgGV == 0) return 0;
-
-  Constant *C = DbgGV->getInitializer();
-  if (C == 0 || Elt >= C->getNumOperands())
+  if (DbgNode == 0)
     return 0;
 
-  C = C->getOperand(Elt);
-  return dyn_cast<GlobalVariable>(C->stripPointerCasts());
+  if (Elt < DbgNode->getNumElements())
+      return dyn_cast_or_null<GlobalVariable>(DbgNode->getElement(Elt));
+  return 0;
 }
 
 //===----------------------------------------------------------------------===//
-// Simple Descriptor Constructors and other Methods
+// Predicates
 //===----------------------------------------------------------------------===//
 
-// Needed by DIVariable::getType().
-DIType::DIType(GlobalVariable *GV) : DIDescriptor(GV) {
-  if (!GV) return;
-  unsigned tag = getTag();
-  if (tag != dwarf::DW_TAG_base_type && !DIDerivedType::isDerivedType(tag) &&
-      !DICompositeType::isCompositeType(tag))
-    DbgGV = 0;
+/// isBasicType - Return true if the specified tag is legal for
+/// DIBasicType.
+bool DIDescriptor::isBasicType() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_base_type;
 }
 
-/// isDerivedType - Return true if the specified tag is legal for
-/// DIDerivedType.
-bool DIType::isDerivedType(unsigned Tag) {
+/// isDerivedType - Return true if the specified tag is legal for DIDerivedType.
+bool DIDescriptor::isDerivedType() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
   switch (Tag) {
   case dwarf::DW_TAG_typedef:
   case dwarf::DW_TAG_pointer_type:
@@ -163,16 +149,18 @@ bool DIType::isDerivedType(unsigned Tag) {
   case dwarf::DW_TAG_inheritance:
     return true;
   default:
-    // FIXME: Even though it doesn't make sense, CompositeTypes are current
-    // modelled as DerivedTypes, this should return true for them as well.
-    return false;
+    // CompositeTypes are currently modelled as DerivedTypes.
+    return isCompositeType();
   }
 }
 
 /// isCompositeType - Return true if the specified tag is legal for
 /// DICompositeType.
-bool DIType::isCompositeType(unsigned TAG) {
-  switch (TAG) {
+bool DIDescriptor::isCompositeType() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  switch (Tag) {
   case dwarf::DW_TAG_array_type:
   case dwarf::DW_TAG_structure_type:
   case dwarf::DW_TAG_union_type:
@@ -187,7 +175,10 @@ bool DIType::isCompositeType(unsigned TAG) {
 }
 
 /// isVariable - Return true if the specified tag is legal for DIVariable.
-bool DIVariable::isVariable(unsigned Tag) {
+bool DIDescriptor::isVariable() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
   switch (Tag) {
   case dwarf::DW_TAG_auto_variable:
   case dwarf::DW_TAG_arg_variable:
@@ -198,19 +189,126 @@ bool DIVariable::isVariable(unsigned Tag) {
   }
 }
 
+/// isType - Return true if the specified tag is legal for DIType.
+bool DIDescriptor::isType() const {
+  return isBasicType() || isCompositeType() || isDerivedType();
+}
+
+/// isSubprogram - Return true if the specified tag is legal for
+/// DISubprogram.
+bool DIDescriptor::isSubprogram() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_subprogram;
+}
+
+/// isGlobalVariable - Return true if the specified tag is legal for
+/// DIGlobalVariable.
+bool DIDescriptor::isGlobalVariable() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_variable;
+}
+
+/// isGlobal - Return true if the specified tag is legal for DIGlobal.
+bool DIDescriptor::isGlobal() const {
+  return isGlobalVariable();
+}
+
+/// isScope - Return true if the specified tag is one of the scope
+/// related tag.
+bool DIDescriptor::isScope() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  switch (Tag) {
+    case dwarf::DW_TAG_compile_unit:
+    case dwarf::DW_TAG_lexical_block:
+    case dwarf::DW_TAG_subprogram:
+      return true;
+    default:
+      break;
+  }
+  return false;
+}
+
+/// isCompileUnit - Return true if the specified tag is DW_TAG_compile_unit.
+bool DIDescriptor::isCompileUnit() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_compile_unit;
+}
+
+/// isLexicalBlock - Return true if the specified tag is DW_TAG_lexical_block.
+bool DIDescriptor::isLexicalBlock() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_lexical_block;
+}
+
+/// isSubrange - Return true if the specified tag is DW_TAG_subrange_type.
+bool DIDescriptor::isSubrange() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_subrange_type;
+}
+
+/// isEnumerator - Return true if the specified tag is DW_TAG_enumerator.
+bool DIDescriptor::isEnumerator() const {
+  assert (!isNull() && "Invalid descriptor!");
+  unsigned Tag = getTag();
+
+  return Tag == dwarf::DW_TAG_enumerator;
+}
+
+//===----------------------------------------------------------------------===//
+// Simple Descriptor Constructors and other Methods
+//===----------------------------------------------------------------------===//
+
+DIType::DIType(MDNode *N) : DIDescriptor(N) {
+  if (!N) return;
+  if (!isBasicType() && !isDerivedType() && !isCompositeType()) {
+    DbgNode = 0;
+  }
+}
+
 unsigned DIArray::getNumElements() const {
-  assert (DbgGV && "Invalid DIArray");
-  Constant *C = DbgGV->getInitializer();
-  assert (C && "Invalid DIArray initializer");
-  return C->getNumOperands();
+  assert (DbgNode && "Invalid DIArray");
+  return DbgNode->getNumElements();
+}
+
+/// replaceAllUsesWith - Replace all uses of debug info referenced by
+/// this descriptor. After this completes, the current debug info value
+/// is erased.
+void DIDerivedType::replaceAllUsesWith(DIDescriptor &D) {
+  if (isNull())
+    return;
+
+  assert (!D.isNull() && "Can not replace with null");
+
+  // Since we use a TrackingVH for the node, its easy for clients to manufacture
+  // legitimate situations where they want to replaceAllUsesWith() on something
+  // which, due to uniquing, has merged with the source. We shield clients from
+  // this detail by allowing a value to be replaced with replaceAllUsesWith()
+  // itself.
+  if (getNode() != D.getNode()) {
+    MDNode *Node = DbgNode;
+    Node->replaceAllUsesWith(D.getNode());
+    delete Node;
+  }
 }
 
 /// Verify - Verify that a compile unit is well formed.
 bool DICompileUnit::Verify() const {
-  if (isNull()) 
+  if (isNull())
     return false;
-  std::string Res;
-  if (getFilename(Res).empty()) 
+  const char *N = getFilename();
+  if (!N)
     return false;
   // It is possible that directory and produce string is empty.
   return true;
@@ -218,26 +316,26 @@ bool DICompileUnit::Verify() const {
 
 /// Verify - Verify that a type descriptor is well formed.
 bool DIType::Verify() const {
-  if (isNull()) 
+  if (isNull())
     return false;
-  if (getContext().isNull()) 
+  if (getContext().isNull())
     return false;
 
   DICompileUnit CU = getCompileUnit();
-  if (!CU.isNull() && !CU.Verify()) 
+  if (!CU.isNull() && !CU.Verify())
     return false;
   return true;
 }
 
 /// Verify - Verify that a composite type descriptor is well formed.
 bool DICompositeType::Verify() const {
-  if (isNull()) 
+  if (isNull())
     return false;
-  if (getContext().isNull()) 
+  if (getContext().isNull())
     return false;
 
   DICompileUnit CU = getCompileUnit();
-  if (!CU.isNull() && !CU.Verify()) 
+  if (!CU.isNull() && !CU.Verify())
     return false;
   return true;
 }
@@ -246,12 +344,12 @@ bool DICompositeType::Verify() const {
 bool DISubprogram::Verify() const {
   if (isNull())
     return false;
-  
+
   if (getContext().isNull())
     return false;
 
   DICompileUnit CU = getCompileUnit();
-  if (!CU.Verify()) 
+  if (!CU.Verify())
     return false;
 
   DICompositeType Ty = getType();
@@ -264,12 +362,12 @@ bool DISubprogram::Verify() const {
 bool DIGlobalVariable::Verify() const {
   if (isNull())
     return false;
-  
+
   if (getContext().isNull())
     return false;
 
   DICompileUnit CU = getCompileUnit();
-  if (!CU.isNull() && !CU.Verify()) 
+  if (!CU.isNull() && !CU.Verify())
     return false;
 
   DIType Ty = getType();
@@ -286,7 +384,7 @@ bool DIGlobalVariable::Verify() const {
 bool DIVariable::Verify() const {
   if (isNull())
     return false;
-  
+
   if (getContext().isNull())
     return false;
 
@@ -312,15 +410,38 @@ uint64_t DIDerivedType::getOriginalTypeSize() const {
 /// information for the function F.
 bool DISubprogram::describes(const Function *F) {
   assert (F && "Invalid function");
-  std::string Name;
-  getLinkageName(Name);
-  if (Name.empty())
-    getName(Name);
-  if (!Name.empty() && (strcmp(Name.c_str(), F->getNameStart()) == false))
+  const char *Name = getLinkageName();
+  if (!Name)
+    Name = getName();
+  if (strcmp(F->getName().data(), Name) == 0)
     return true;
   return false;
 }
 
+const char *DIScope::getFilename() const {
+  if (isLexicalBlock()) 
+    return DILexicalBlock(DbgNode).getFilename();
+  else if (isSubprogram())
+    return DISubprogram(DbgNode).getFilename();
+  else if (isCompileUnit())
+    return DICompileUnit(DbgNode).getFilename();
+  else 
+    assert (0 && "Invalid DIScope!");
+  return NULL;
+}
+
+const char *DIScope::getDirectory() const {
+  if (isLexicalBlock()) 
+    return DILexicalBlock(DbgNode).getDirectory();
+  else if (isSubprogram())
+    return DISubprogram(DbgNode).getDirectory();
+  else if (isCompileUnit())
+    return DICompileUnit(DbgNode).getDirectory();
+  else 
+    assert (0 && "Invalid DIScope!");
+  return NULL;
+}
+
 //===----------------------------------------------------------------------===//
 // DIDescriptor: dump routines for all descriptors.
 //===----------------------------------------------------------------------===//
@@ -328,69 +449,67 @@ bool DISubprogram::describes(const Function *F) {
 
 /// dump - Print descriptor.
 void DIDescriptor::dump() const {
-  cerr << "[" << dwarf::TagString(getTag()) << "] ";
-  cerr << std::hex << "[GV:" << DbgGV << "]" << std::dec;
+  errs() << "[" << dwarf::TagString(getTag()) << "] ";
+  errs().write_hex((intptr_t) &*DbgNode) << ']';
 }
 
 /// dump - Print compile unit.
 void DICompileUnit::dump() const {
   if (getLanguage())
-    cerr << " [" << dwarf::LanguageString(getLanguage()) << "] ";
+    errs() << " [" << dwarf::LanguageString(getLanguage()) << "] ";
 
-  std::string Res1, Res2;
-  cerr << " [" << getDirectory(Res1) << "/" << getFilename(Res2) << " ]";
+  errs() << " [" << getDirectory() << "/" << getFilename() << " ]";
 }
 
 /// dump - Print type.
 void DIType::dump() const {
   if (isNull()) return;
 
-  std::string Res;
-  if (!getName(Res).empty())
-    cerr << " [" << Res << "] ";
+  if (const char *Res = getName())
+    errs() << " [" << Res << "] ";
 
   unsigned Tag = getTag();
-  cerr << " [" << dwarf::TagString(Tag) << "] ";
+  errs() << " [" << dwarf::TagString(Tag) << "] ";
 
   // TODO : Print context
   getCompileUnit().dump();
-  cerr << " [" 
-       << getLineNumber() << ", " 
-       << getSizeInBits() << ", "
-       << getAlignInBits() << ", "
-       << getOffsetInBits() 
-       << "] ";
-
-  if (isPrivate()) 
-    cerr << " [private] ";
+  errs() << " ["
+         << getLineNumber() << ", "
+         << getSizeInBits() << ", "
+         << getAlignInBits() << ", "
+         << getOffsetInBits()
+         << "] ";
+
+  if (isPrivate())
+    errs() << " [private] ";
   else if (isProtected())
-    cerr << " [protected] ";
+    errs() << " [protected] ";
 
   if (isForwardDecl())
-    cerr << " [fwd] ";
-
-  if (isBasicType(Tag))
-    DIBasicType(DbgGV).dump();
-  else if (isDerivedType(Tag))
-    DIDerivedType(DbgGV).dump();
-  else if (isCompositeType(Tag))
-    DICompositeType(DbgGV).dump();
+    errs() << " [fwd] ";
+
+  if (isBasicType())
+    DIBasicType(DbgNode).dump();
+  else if (isDerivedType())
+    DIDerivedType(DbgNode).dump();
+  else if (isCompositeType())
+    DICompositeType(DbgNode).dump();
   else {
-    cerr << "Invalid DIType\n";
+    errs() << "Invalid DIType\n";
     return;
   }
 
-  cerr << "\n";
+  errs() << "\n";
 }
 
 /// dump - Print basic type.
 void DIBasicType::dump() const {
-  cerr << " [" << dwarf::AttributeEncodingString(getEncoding()) << "] ";
+  errs() << " [" << dwarf::AttributeEncodingString(getEncoding()) << "] ";
 }
 
 /// dump - Print derived type.
 void DIDerivedType::dump() const {
-  cerr << "\n\t Derived From: "; getTypeDerivedFrom().dump();
+  errs() << "\n\t Derived From: "; getTypeDerivedFrom().dump();
 }
 
 /// dump - Print composite type.
@@ -398,54 +517,72 @@ void DICompositeType::dump() const {
   DIArray A = getTypeArray();
   if (A.isNull())
     return;
-  cerr << " [" << A.getNumElements() << " elements]";
+  errs() << " [" << A.getNumElements() << " elements]";
 }
 
 /// dump - Print global.
 void DIGlobal::dump() const {
-  std::string Res;
-  if (!getName(Res).empty())
-    cerr << " [" << Res << "] ";
+  if (const char *Res = getName())
+    errs() << " [" << Res << "] ";
 
   unsigned Tag = getTag();
-  cerr << " [" << dwarf::TagString(Tag) << "] ";
+  errs() << " [" << dwarf::TagString(Tag) << "] ";
 
   // TODO : Print context
   getCompileUnit().dump();
-  cerr << " [" << getLineNumber() << "] ";
+  errs() << " [" << getLineNumber() << "] ";
 
   if (isLocalToUnit())
-    cerr << " [local] ";
+    errs() << " [local] ";
 
   if (isDefinition())
-    cerr << " [def] ";
+    errs() << " [def] ";
 
-  if (isGlobalVariable(Tag))
-    DIGlobalVariable(DbgGV).dump();
+  if (isGlobalVariable())
+    DIGlobalVariable(DbgNode).dump();
 
-  cerr << "\n";
+  errs() << "\n";
 }
 
 /// dump - Print subprogram.
 void DISubprogram::dump() const {
-  DIGlobal::dump();
+  if (const char *Res = getName())
+    errs() << " [" << Res << "] ";
+
+  unsigned Tag = getTag();
+  errs() << " [" << dwarf::TagString(Tag) << "] ";
+
+  // TODO : Print context
+  getCompileUnit().dump();
+  errs() << " [" << getLineNumber() << "] ";
+
+  if (isLocalToUnit())
+    errs() << " [local] ";
+
+  if (isDefinition())
+    errs() << " [def] ";
+
+  errs() << "\n";
 }
 
 /// dump - Print global variable.
 void DIGlobalVariable::dump() const {
-  cerr << " ["; getGlobal()->dump(); cerr << "] ";
+  errs() << " [";
+  getGlobal()->dump();
+  errs() << "] ";
 }
 
 /// dump - Print variable.
 void DIVariable::dump() const {
-  std::string Res;
-  if (!getName(Res).empty())
-    cerr << " [" << Res << "] ";
+  if (const char *Res = getName())
+    errs() << " [" << Res << "] ";
 
   getCompileUnit().dump();
-  cerr << " [" << getLineNumber() << "] ";
+  errs() << " [" << getLineNumber() << "] ";
   getType().dump();
-  cerr << "\n";
+  errs() << "\n";
+
+  // FIXME: Dump complex addresses
 }
 
 //===----------------------------------------------------------------------===//
@@ -453,98 +590,46 @@ void DIVariable::dump() const {
 //===----------------------------------------------------------------------===//
 
 DIFactory::DIFactory(Module &m)
-  : M(m), StopPointFn(0), FuncStartFn(0), RegionStartFn(0), RegionEndFn(0),
+  : M(m), VMContext(M.getContext()), StopPointFn(0), FuncStartFn(0),
+    RegionStartFn(0), RegionEndFn(0),
     DeclareFn(0) {
-  EmptyStructPtr = PointerType::getUnqual(StructType::get());
-}
-
-/// getCastToEmpty - Return this descriptor as a Constant* with type '{}*'.
-/// This is only valid when the descriptor is non-null.
-Constant *DIFactory::getCastToEmpty(DIDescriptor D) {
-  if (D.isNull()) return Constant::getNullValue(EmptyStructPtr);
-  return ConstantExpr::getBitCast(D.getGV(), EmptyStructPtr);
+  EmptyStructPtr = PointerType::getUnqual(StructType::get(VMContext));
 }
 
 Constant *DIFactory::GetTagConstant(unsigned TAG) {
   assert((TAG & LLVMDebugVersionMask) == 0 &&
          "Tag too large for debug encoding!");
-  return ConstantInt::get(Type::Int32Ty, TAG | LLVMDebugVersion);
-}
-
-Constant *DIFactory::GetStringConstant(const std::string &String) {
-  // Check string cache for previous edition.
-  Constant *&Slot = StringCache[String];
-  
-  // Return Constant if previously defined.
-  if (Slot) return Slot;
-  
-  const PointerType *DestTy = PointerType::getUnqual(Type::Int8Ty);
-  
-  // If empty string then use a i8* null instead.
-  if (String.empty())
-    return Slot = ConstantPointerNull::get(DestTy);
-
-  // Construct string as an llvm constant.
-  Constant *ConstStr = ConstantArray::get(String);
-    
-  // Otherwise create and return a new string global.
-  GlobalVariable *StrGV = new GlobalVariable(ConstStr->getType(), true,
-                                             GlobalVariable::InternalLinkage,
-                                             ConstStr, ".str", &M);
-  StrGV->setSection("llvm.metadata");
-  return Slot = ConstantExpr::getBitCast(StrGV, DestTy);
+  return ConstantInt::get(Type::getInt32Ty(VMContext), TAG | LLVMDebugVersion);
 }
 
 //===----------------------------------------------------------------------===//
 // DIFactory: Primary Constructors
 //===----------------------------------------------------------------------===//
 
-/// GetOrCreateArray - Create an descriptor for an array of descriptors. 
+/// GetOrCreateArray - Create an descriptor for an array of descriptors.
 /// This implicitly uniques the arrays created.
 DIArray DIFactory::GetOrCreateArray(DIDescriptor *Tys, unsigned NumTys) {
-  SmallVector<Constant*, 16> Elts;
-  
-  for (unsigned i = 0; i != NumTys; ++i)
-    Elts.push_back(getCastToEmpty(Tys[i]));
-  
-  Constant *Init = ConstantArray::get(ArrayType::get(EmptyStructPtr,
-                                                     Elts.size()),
-                                      Elts.data(), Elts.size());
-  // If we already have this array, just return the uniqued version.
-  DIDescriptor &Entry = SimpleConstantCache[Init];
-  if (!Entry.isNull()) return DIArray(Entry.getGV());
-  
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.array", &M);
-  GV->setSection("llvm.metadata");
-  Entry = DIDescriptor(GV);
-  return DIArray(GV);
+  SmallVector<Value*, 16> Elts;
+
+  if (NumTys == 0)
+    Elts.push_back(llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)));
+  else
+    for (unsigned i = 0; i != NumTys; ++i)
+      Elts.push_back(Tys[i].getNode());
+
+  return DIArray(MDNode::get(VMContext,Elts.data(), Elts.size()));
 }
 
 /// GetOrCreateSubrange - Create a descriptor for a value range.  This
 /// implicitly uniques the values returned.
 DISubrange DIFactory::GetOrCreateSubrange(int64_t Lo, int64_t Hi) {
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_subrange_type),
-    ConstantInt::get(Type::Int64Ty, Lo),
-    ConstantInt::get(Type::Int64Ty, Hi)
+    ConstantInt::get(Type::getInt64Ty(VMContext), Lo),
+    ConstantInt::get(Type::getInt64Ty(VMContext), Hi)
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-
-  // If we already have this range, just return the uniqued version.
-  DIDescriptor &Entry = SimpleConstantCache[Init];
-  if (!Entry.isNull()) return DISubrange(Entry.getGV());
-  
-  M.addTypeName("llvm.dbg.subrange.type", Init->getType());
 
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.subrange", &M);
-  GV->setSection("llvm.metadata");
-  Entry = DIDescriptor(GV);
-  return DISubrange(GV);
+  return DISubrange(MDNode::get(VMContext, &Elts[0], 3));
 }
 
 
@@ -552,92 +637,69 @@ DISubrange DIFactory::GetOrCreateSubrange(int64_t Lo, int64_t Hi) {
 /// CreateCompileUnit - Create a new descriptor for the specified compile
 /// unit.  Note that this does not unique compile units within the module.
 DICompileUnit DIFactory::CreateCompileUnit(unsigned LangID,
-                                           const std::string &Filename,
-                                           const std::string &Directory,
-                                           const std::string &Producer,
+                                           StringRef Filename,
+                                           StringRef Directory,
+                                           StringRef Producer,
                                            bool isMain,
                                            bool isOptimized,
                                            const char *Flags,
                                            unsigned RunTimeVer) {
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_compile_unit),
-    Constant::getNullValue(EmptyStructPtr),
-    ConstantInt::get(Type::Int32Ty, LangID),
-    GetStringConstant(Filename),
-    GetStringConstant(Directory),
-    GetStringConstant(Producer),
-    ConstantInt::get(Type::Int1Ty, isMain),
-    ConstantInt::get(Type::Int1Ty, isOptimized),
-    GetStringConstant(Flags),
-    ConstantInt::get(Type::Int32Ty, RunTimeVer)
+    llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LangID),
+    MDString::get(VMContext, Filename),
+    MDString::get(VMContext, Directory),
+    MDString::get(VMContext, Producer),
+    ConstantInt::get(Type::getInt1Ty(VMContext), isMain),
+    ConstantInt::get(Type::getInt1Ty(VMContext), isOptimized),
+    MDString::get(VMContext, Flags),
+    ConstantInt::get(Type::getInt32Ty(VMContext), RunTimeVer)
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.compile_unit.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::LinkOnceAnyLinkage,
-                                          Init, "llvm.dbg.compile_unit", &M);
-  GV->setSection("llvm.metadata");
-  return DICompileUnit(GV);
+
+  return DICompileUnit(MDNode::get(VMContext, &Elts[0], 10));
 }
 
 /// CreateEnumerator - Create a single enumerator value.
-DIEnumerator DIFactory::CreateEnumerator(const std::string &Name, uint64_t Val){
-  Constant *Elts[] = {
+DIEnumerator DIFactory::CreateEnumerator(StringRef Name, uint64_t Val){
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_enumerator),
-    GetStringConstant(Name),
-    ConstantInt::get(Type::Int64Ty, Val)
+    MDString::get(VMContext, Name),
+    ConstantInt::get(Type::getInt64Ty(VMContext), Val)
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.enumerator.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.enumerator", &M);
-  GV->setSection("llvm.metadata");
-  return DIEnumerator(GV);
+  return DIEnumerator(MDNode::get(VMContext, &Elts[0], 3));
 }
 
 
 /// CreateBasicType - Create a basic type like int, float, etc.
 DIBasicType DIFactory::CreateBasicType(DIDescriptor Context,
-                                      const std::string &Name,
+                                       StringRef Name,
                                        DICompileUnit CompileUnit,
                                        unsigned LineNumber,
                                        uint64_t SizeInBits,
                                        uint64_t AlignInBits,
                                        uint64_t OffsetInBits, unsigned Flags,
                                        unsigned Encoding) {
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_base_type),
-    getCastToEmpty(Context),
-    GetStringConstant(Name),
-    getCastToEmpty(CompileUnit),
-    ConstantInt::get(Type::Int32Ty, LineNumber),
-    ConstantInt::get(Type::Int64Ty, SizeInBits),
-    ConstantInt::get(Type::Int64Ty, AlignInBits),
-    ConstantInt::get(Type::Int64Ty, OffsetInBits),
-    ConstantInt::get(Type::Int32Ty, Flags),
-    ConstantInt::get(Type::Int32Ty, Encoding)
+    Context.getNode(),
+    MDString::get(VMContext, Name),
+    CompileUnit.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
+    ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), OffsetInBits),
+    ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
+    ConstantInt::get(Type::getInt32Ty(VMContext), Encoding)
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.basictype.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.basictype", &M);
-  GV->setSection("llvm.metadata");
-  return DIBasicType(GV);
+  return DIBasicType(MDNode::get(VMContext, &Elts[0], 10));
 }
 
 /// CreateDerivedType - Create a derived type like const qualified type,
 /// pointer, typedef, etc.
 DIDerivedType DIFactory::CreateDerivedType(unsigned Tag,
                                            DIDescriptor Context,
-                                           const std::string &Name,
+                                           StringRef Name,
                                            DICompileUnit CompileUnit,
                                            unsigned LineNumber,
                                            uint64_t SizeInBits,
@@ -645,33 +707,25 @@ DIDerivedType DIFactory::CreateDerivedType(unsigned Tag,
                                            uint64_t OffsetInBits,
                                            unsigned Flags,
                                            DIType DerivedFrom) {
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(Tag),
-    getCastToEmpty(Context),
-    GetStringConstant(Name),
-    getCastToEmpty(CompileUnit),
-    ConstantInt::get(Type::Int32Ty, LineNumber),
-    ConstantInt::get(Type::Int64Ty, SizeInBits),
-    ConstantInt::get(Type::Int64Ty, AlignInBits),
-    ConstantInt::get(Type::Int64Ty, OffsetInBits),
-    ConstantInt::get(Type::Int32Ty, Flags),
-    getCastToEmpty(DerivedFrom)
+    Context.getNode(),
+    MDString::get(VMContext, Name),
+    CompileUnit.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
+    ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), OffsetInBits),
+    ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
+    DerivedFrom.getNode(),
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.derivedtype.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.derivedtype", &M);
-  GV->setSection("llvm.metadata");
-  return DIDerivedType(GV);
+  return DIDerivedType(MDNode::get(VMContext, &Elts[0], 10));
 }
 
 /// CreateCompositeType - Create a composite type like array, struct, etc.
 DICompositeType DIFactory::CreateCompositeType(unsigned Tag,
                                                DIDescriptor Context,
-                                               const std::string &Name,
+                                               StringRef Name,
                                                DICompileUnit CompileUnit,
                                                unsigned LineNumber,
                                                uint64_t SizeInBits,
@@ -682,143 +736,143 @@ DICompositeType DIFactory::CreateCompositeType(unsigned Tag,
                                                DIArray Elements,
                                                unsigned RuntimeLang) {
 
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(Tag),
-    getCastToEmpty(Context),
-    GetStringConstant(Name),
-    getCastToEmpty(CompileUnit),
-    ConstantInt::get(Type::Int32Ty, LineNumber),
-    ConstantInt::get(Type::Int64Ty, SizeInBits),
-    ConstantInt::get(Type::Int64Ty, AlignInBits),
-    ConstantInt::get(Type::Int64Ty, OffsetInBits),
-    ConstantInt::get(Type::Int32Ty, Flags),
-    getCastToEmpty(DerivedFrom),
-    getCastToEmpty(Elements),
-    ConstantInt::get(Type::Int32Ty, RuntimeLang)
+    Context.getNode(),
+    MDString::get(VMContext, Name),
+    CompileUnit.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNumber),
+    ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
+    ConstantInt::get(Type::getInt64Ty(VMContext), OffsetInBits),
+    ConstantInt::get(Type::getInt32Ty(VMContext), Flags),
+    DerivedFrom.getNode(),
+    Elements.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), RuntimeLang)
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.composite.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.composite", &M);
-  GV->setSection("llvm.metadata");
-  return DICompositeType(GV);
+  return DICompositeType(MDNode::get(VMContext, &Elts[0], 12));
 }
 
 
 /// CreateSubprogram - Create a new descriptor for the specified subprogram.
 /// See comments in DISubprogram for descriptions of these fields.  This
 /// method does not unique the generated descriptors.
-DISubprogram DIFactory::CreateSubprogram(DIDescriptor Context, 
-                                         const std::string &Name,
-                                         const std::string &DisplayName,
-                                         const std::string &LinkageName,
+DISubprogram DIFactory::CreateSubprogram(DIDescriptor Context,
+                                         StringRef Name,
+                                         StringRef DisplayName,
+                                         StringRef LinkageName,
                                          DICompileUnit CompileUnit,
                                          unsigned LineNo, DIType Type,
                                          bool isLocalToUnit,
                                          bool isDefinition) {
 
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_subprogram),
-    Constant::getNullValue(EmptyStructPtr),
-    getCastToEmpty(Context),
-    GetStringConstant(Name),
-    GetStringConstant(DisplayName),
-    GetStringConstant(LinkageName),
-    getCastToEmpty(CompileUnit),
-    ConstantInt::get(Type::Int32Ty, LineNo),
-    getCastToEmpty(Type),
-    ConstantInt::get(Type::Int1Ty, isLocalToUnit),
-    ConstantInt::get(Type::Int1Ty, isDefinition)
+    llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),
+    Context.getNode(),
+    MDString::get(VMContext, Name),
+    MDString::get(VMContext, DisplayName),
+    MDString::get(VMContext, LinkageName),
+    CompileUnit.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
+    Type.getNode(),
+    ConstantInt::get(Type::getInt1Ty(VMContext), isLocalToUnit),
+    ConstantInt::get(Type::getInt1Ty(VMContext), isDefinition)
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.subprogram.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::LinkOnceAnyLinkage,
-                                          Init, "llvm.dbg.subprogram", &M);
-  GV->setSection("llvm.metadata");
-  return DISubprogram(GV);
+  return DISubprogram(MDNode::get(VMContext, &Elts[0], 11));
 }
 
 /// CreateGlobalVariable - Create a new descriptor for the specified global.
 DIGlobalVariable
-DIFactory::CreateGlobalVariable(DIDescriptor Context, const std::string &Name,
-                                const std::string &DisplayName,
-                                const std::string &LinkageName,
+DIFactory::CreateGlobalVariable(DIDescriptor Context, StringRef Name,
+                                StringRef DisplayName,
+                                StringRef LinkageName,
                                 DICompileUnit CompileUnit,
                                 unsigned LineNo, DIType Type,bool isLocalToUnit,
                                 bool isDefinition, llvm::GlobalVariable *Val) {
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_variable),
-    Constant::getNullValue(EmptyStructPtr),
-    getCastToEmpty(Context),
-    GetStringConstant(Name),
-    GetStringConstant(DisplayName),
-    GetStringConstant(LinkageName),
-    getCastToEmpty(CompileUnit),
-    ConstantInt::get(Type::Int32Ty, LineNo),
-    getCastToEmpty(Type),
-    ConstantInt::get(Type::Int1Ty, isLocalToUnit),
-    ConstantInt::get(Type::Int1Ty, isDefinition),
-    ConstantExpr::getBitCast(Val, EmptyStructPtr)
+    llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),
+    Context.getNode(),
+    MDString::get(VMContext, Name),
+    MDString::get(VMContext, DisplayName),
+    MDString::get(VMContext, LinkageName),
+    CompileUnit.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
+    Type.getNode(),
+    ConstantInt::get(Type::getInt1Ty(VMContext), isLocalToUnit),
+    ConstantInt::get(Type::getInt1Ty(VMContext), isDefinition),
+    Val
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.global_variable.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::LinkOnceAnyLinkage,
-                                          Init, "llvm.dbg.global_variable", &M);
-  GV->setSection("llvm.metadata");
-  return DIGlobalVariable(GV);
+
+  Value *const *Vs = &Elts[0];
+  MDNode *Node = MDNode::get(VMContext,Vs, 12);
+
+  // Create a named metadata so that we do not lose this mdnode.
+  NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.gv");
+  NMD->addElement(Node);
+
+  return DIGlobalVariable(Node);
 }
 
 
 /// CreateVariable - Create a new descriptor for the specified variable.
 DIVariable DIFactory::CreateVariable(unsigned Tag, DIDescriptor Context,
-                                     const std::string &Name,
+                                     StringRef Name,
                                      DICompileUnit CompileUnit, unsigned LineNo,
                                      DIType Type) {
-  Constant *Elts[] = {
+  Value *Elts[] = {
     GetTagConstant(Tag),
-    getCastToEmpty(Context),
-    GetStringConstant(Name),
-    getCastToEmpty(CompileUnit),
-    ConstantInt::get(Type::Int32Ty, LineNo),
-    getCastToEmpty(Type)
+    Context.getNode(),
+    MDString::get(VMContext, Name),
+    CompileUnit.getNode(),
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
+    Type.getNode(),
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.variable.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.variable", &M);
-  GV->setSection("llvm.metadata");
-  return DIVariable(GV);
+  return DIVariable(MDNode::get(VMContext, &Elts[0], 6));
+}
+
+
+/// CreateComplexVariable - Create a new descriptor for the specified variable
+/// which has a complex address expression for its address.
+DIVariable DIFactory::CreateComplexVariable(unsigned Tag, DIDescriptor Context,
+                                            const std::string &Name,
+                                            DICompileUnit CompileUnit,
+                                            unsigned LineNo,
+                                   DIType Type, SmallVector<Value *, 9> &addr) {
+  SmallVector<Value *, 9> Elts;
+  Elts.push_back(GetTagConstant(Tag));
+  Elts.push_back(Context.getNode());
+  Elts.push_back(MDString::get(VMContext, Name));
+  Elts.push_back(CompileUnit.getNode());
+  Elts.push_back(ConstantInt::get(Type::getInt32Ty(VMContext), LineNo));
+  Elts.push_back(Type.getNode());
+  Elts.insert(Elts.end(), addr.begin(), addr.end());
+
+  return DIVariable(MDNode::get(VMContext, &Elts[0], 6+addr.size()));
 }
 
 
 /// CreateBlock - This creates a descriptor for a lexical block with the
-/// specified parent context.
-DIBlock DIFactory::CreateBlock(DIDescriptor Context) {
-  Constant *Elts[] = {
+/// specified parent VMContext.
+DILexicalBlock DIFactory::CreateLexicalBlock(DIDescriptor Context) {
+  Value *Elts[] = {
     GetTagConstant(dwarf::DW_TAG_lexical_block),
-    getCastToEmpty(Context)
+    Context.getNode()
+  };
+  return DILexicalBlock(MDNode::get(VMContext, &Elts[0], 2));
+}
+
+/// CreateLocation - Creates a debug info location.
+DILocation DIFactory::CreateLocation(unsigned LineNo, unsigned ColumnNo,
+                                     DIScope S, DILocation OrigLoc) {
+  Value *Elts[] = {
+    ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
+    ConstantInt::get(Type::getInt32Ty(VMContext), ColumnNo),
+    S.getNode(),
+    OrigLoc.getNode(),
   };
-  
-  Constant *Init = ConstantStruct::get(Elts, sizeof(Elts)/sizeof(Elts[0]));
-  
-  M.addTypeName("llvm.dbg.block.type", Init->getType());
-  GlobalVariable *GV = new GlobalVariable(Init->getType(), true,
-                                          GlobalValue::InternalLinkage,
-                                          Init, "llvm.dbg.block", &M);
-  GV->setSection("llvm.metadata");
-  return DIBlock(GV);
+  return DILocation(MDNode::get(VMContext, &Elts[0], 4));
 }
 
 
@@ -830,17 +884,17 @@ DIBlock DIFactory::CreateBlock(DIDescriptor Context) {
 /// inserting it at the end of the specified basic block.
 void DIFactory::InsertStopPoint(DICompileUnit CU, unsigned LineNo,
                                 unsigned ColNo, BasicBlock *BB) {
-  
+
   // Lazily construct llvm.dbg.stoppoint function.
   if (!StopPointFn)
-    StopPointFn = llvm::Intrinsic::getDeclaration(&M, 
+    StopPointFn = llvm::Intrinsic::getDeclaration(&M,
                                               llvm::Intrinsic::dbg_stoppoint);
-  
+
   // Invoke llvm.dbg.stoppoint
   Value *Args[] = {
-    llvm::ConstantInt::get(llvm::Type::Int32Ty, LineNo),
-    llvm::ConstantInt::get(llvm::Type::Int32Ty, ColNo),
-    getCastToEmpty(CU)
+    ConstantInt::get(llvm::Type::getInt32Ty(VMContext), LineNo),
+    ConstantInt::get(llvm::Type::getInt32Ty(VMContext), ColNo),
+    CU.getNode()
   };
   CallInst::Create(StopPointFn, Args, Args+3, "", BB);
 }
@@ -851,9 +905,9 @@ void DIFactory::InsertSubprogramStart(DISubprogram SP, BasicBlock *BB) {
   // Lazily construct llvm.dbg.func.start.
   if (!FuncStartFn)
     FuncStartFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_func_start);
-  
+
   // Call llvm.dbg.func.start which also implicitly sets a stoppoint.
-  CallInst::Create(FuncStartFn, getCastToEmpty(SP), "", BB);
+  CallInst::Create(FuncStartFn, SP.getNode(), "", BB);
 }
 
 /// InsertRegionStart - Insert a new llvm.dbg.region.start intrinsic call to
@@ -864,7 +918,7 @@ void DIFactory::InsertRegionStart(DIDescriptor D, BasicBlock *BB) {
     RegionStartFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_region_start);
 
   // Call llvm.dbg.func.start.
-  CallInst::Create(RegionStartFn, getCastToEmpty(D), "", BB);
+  CallInst::Create(RegionStartFn, D.getNode(), "", BB);
 }
 
 /// InsertRegionEnd - Insert a new llvm.dbg.region.end intrinsic call to
@@ -875,19 +929,220 @@ void DIFactory::InsertRegionEnd(DIDescriptor D, BasicBlock *BB) {
     RegionEndFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_region_end);
 
   // Call llvm.dbg.region.end.
-  CallInst::Create(RegionEndFn, getCastToEmpty(D), "", BB);
+  CallInst::Create(RegionEndFn, D.getNode(), "", BB);
 }
 
 /// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
-void DIFactory::InsertDeclare(Value *Storage, DIVariable D, BasicBlock *BB) {
+void DIFactory::InsertDeclare(Value *Storage, DIVariable D,
+                              Instruction *InsertBefore) {
   // Cast the storage to a {}* for the call to llvm.dbg.declare.
-  Storage = new BitCastInst(Storage, EmptyStructPtr, "", BB);
-  
+  Storage = new BitCastInst(Storage, EmptyStructPtr, "", InsertBefore);
+
   if (!DeclareFn)
     DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
 
-  Value *Args[] = { Storage, getCastToEmpty(D) };
-  CallInst::Create(DeclareFn, Args, Args+2, "", BB);
+  Value *Args[] = { Storage, D.getNode() };
+  CallInst::Create(DeclareFn, Args, Args+2, "", InsertBefore);
+}
+
+/// InsertDeclare - Insert a new llvm.dbg.declare intrinsic call.
+void DIFactory::InsertDeclare(Value *Storage, DIVariable D,
+                              BasicBlock *InsertAtEnd) {
+  // Cast the storage to a {}* for the call to llvm.dbg.declare.
+  Storage = new BitCastInst(Storage, EmptyStructPtr, "", InsertAtEnd);
+
+  if (!DeclareFn)
+    DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
+
+  Value *Args[] = { Storage, D.getNode() };
+  CallInst::Create(DeclareFn, Args, Args+2, "", InsertAtEnd);
+}
+
+
+//===----------------------------------------------------------------------===//
+// DebugInfoFinder implementations.
+//===----------------------------------------------------------------------===//
+
+/// processModule - Process entire module and collect debug info.
+void DebugInfoFinder::processModule(Module &M) {
+
+#ifdef ATTACH_DEBUG_INFO_TO_AN_INSN
+  MetadataContext &TheMetadata = M.getContext().getMetadata();
+  unsigned MDDbgKind = TheMetadata.getMDKind("dbg");
+#endif
+  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+    for (Function::iterator FI = (*I).begin(), FE = (*I).end(); FI != FE; ++FI)
+      for (BasicBlock::iterator BI = (*FI).begin(), BE = (*FI).end(); BI != BE;
+           ++BI) {
+        if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(BI))
+          processStopPoint(SPI);
+        else if (DbgFuncStartInst *FSI = dyn_cast<DbgFuncStartInst>(BI))
+          processFuncStart(FSI);
+        else if (DbgRegionStartInst *DRS = dyn_cast<DbgRegionStartInst>(BI))
+          processRegionStart(DRS);
+        else if (DbgRegionEndInst *DRE = dyn_cast<DbgRegionEndInst>(BI))
+          processRegionEnd(DRE);
+        else if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI))
+          processDeclare(DDI);
+#ifdef ATTACH_DEBUG_INFO_TO_AN_INSN
+        else if (MDDbgKind) {
+          if (MDNode *L = TheMetadata.getMD(MDDbgKind, BI)) {
+            DILocation Loc(L);
+            DIScope S(Loc.getScope().getNode());
+            if (S.isCompileUnit())
+              addCompileUnit(DICompileUnit(S.getNode()));
+            else if (S.isSubprogram())
+              processSubprogram(DISubprogram(S.getNode()));
+            else if (S.isLexicalBlock())
+              processLexicalBlock(DILexicalBlock(S.getNode()));
+          }
+        }
+#endif
+      }
+
+  NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.gv");
+  if (!NMD)
+    return;
+
+  for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
+    DIGlobalVariable DIG(cast<MDNode>(NMD->getElement(i)));
+    if (addGlobalVariable(DIG)) {
+      addCompileUnit(DIG.getCompileUnit());
+      processType(DIG.getType());
+    }
+  }
+}
+
+/// processType - Process DIType.
+void DebugInfoFinder::processType(DIType DT) {
+  if (!addType(DT))
+    return;
+
+  addCompileUnit(DT.getCompileUnit());
+  if (DT.isCompositeType()) {
+    DICompositeType DCT(DT.getNode());
+    processType(DCT.getTypeDerivedFrom());
+    DIArray DA = DCT.getTypeArray();
+    if (!DA.isNull())
+      for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
+        DIDescriptor D = DA.getElement(i);
+        DIType TypeE = DIType(D.getNode());
+        if (!TypeE.isNull())
+          processType(TypeE);
+        else
+          processSubprogram(DISubprogram(D.getNode()));
+      }
+  } else if (DT.isDerivedType()) {
+    DIDerivedType DDT(DT.getNode());
+    if (!DDT.isNull())
+      processType(DDT.getTypeDerivedFrom());
+  }
+}
+
+/// processLexicalBlock
+void DebugInfoFinder::processLexicalBlock(DILexicalBlock LB) {
+  if (LB.isNull())
+    return;
+  DIScope Context = LB.getContext();
+  if (Context.isLexicalBlock())
+    return processLexicalBlock(DILexicalBlock(Context.getNode()));
+  else
+    return processSubprogram(DISubprogram(Context.getNode()));
+}
+
+/// processSubprogram - Process DISubprogram.
+void DebugInfoFinder::processSubprogram(DISubprogram SP) {
+  if (SP.isNull())
+    return;
+  if (!addSubprogram(SP))
+    return;
+  addCompileUnit(SP.getCompileUnit());
+  processType(SP.getType());
+}
+
+/// processStopPoint - Process DbgStopPointInst.
+void DebugInfoFinder::processStopPoint(DbgStopPointInst *SPI) {
+  MDNode *Context = dyn_cast<MDNode>(SPI->getContext());
+  addCompileUnit(DICompileUnit(Context));
+}
+
+/// processFuncStart - Process DbgFuncStartInst.
+void DebugInfoFinder::processFuncStart(DbgFuncStartInst *FSI) {
+  MDNode *SP = dyn_cast<MDNode>(FSI->getSubprogram());
+  processSubprogram(DISubprogram(SP));
+}
+
+/// processRegionStart - Process DbgRegionStart.
+void DebugInfoFinder::processRegionStart(DbgRegionStartInst *DRS) {
+  MDNode *SP = dyn_cast<MDNode>(DRS->getContext());
+  processSubprogram(DISubprogram(SP));
+}
+
+/// processRegionEnd - Process DbgRegionEnd.
+void DebugInfoFinder::processRegionEnd(DbgRegionEndInst *DRE) {
+  MDNode *SP = dyn_cast<MDNode>(DRE->getContext());
+  processSubprogram(DISubprogram(SP));
+}
+
+/// processDeclare - Process DbgDeclareInst.
+void DebugInfoFinder::processDeclare(DbgDeclareInst *DDI) {
+  DIVariable DV(cast<MDNode>(DDI->getVariable()));
+  if (DV.isNull())
+    return;
+
+  if (!NodesSeen.insert(DV.getNode()))
+    return;
+
+  addCompileUnit(DV.getCompileUnit());
+  processType(DV.getType());
+}
+
+/// addType - Add type into Tys.
+bool DebugInfoFinder::addType(DIType DT) {
+  if (DT.isNull())
+    return false;
+
+  if (!NodesSeen.insert(DT.getNode()))
+    return false;
+
+  TYs.push_back(DT.getNode());
+  return true;
+}
+
+/// addCompileUnit - Add compile unit into CUs.
+bool DebugInfoFinder::addCompileUnit(DICompileUnit CU) {
+  if (CU.isNull())
+    return false;
+
+  if (!NodesSeen.insert(CU.getNode()))
+    return false;
+
+  CUs.push_back(CU.getNode());
+  return true;
+}
+
+/// addGlobalVariable - Add global variable into GVs.
+bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable DIG) {
+  if (DIG.isNull())
+    return false;
+
+  if (!NodesSeen.insert(DIG.getNode()))
+    return false;
+
+  GVs.push_back(DIG.getNode());
+  return true;
+}
+
+// addSubprogram - Add subprgoram into SPs.
+bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
+  if (SP.isNull())
+    return false;
+
+  if (!NodesSeen.insert(SP.getNode()))
+    return false;
+
+  SPs.push_back(SP.getNode());
+  return true;
 }
 
 namespace llvm {
@@ -939,30 +1194,17 @@ namespace llvm {
 
   Value *findDbgGlobalDeclare(GlobalVariable *V) {
     const Module *M = V->getParent();
-    const Type *Ty = M->getTypeByName("llvm.dbg.global_variable.type");
-    if (!Ty) return 0;
-
-    Ty = PointerType::get(Ty, 0);
-
-    Value *Val = V->stripPointerCasts();
-    for (Value::use_iterator I = Val->use_begin(), E = Val->use_end();
-         I != E; ++I) {
-      if (ConstantExpr *CE = dyn_cast<ConstantExpr>(I)) {
-        if (CE->getOpcode() == Instruction::BitCast) {
-          Value *VV = CE;
-
-          while (VV->hasOneUse())
-            VV = *VV->use_begin();
+    NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.gv");
+    if (!NMD)
+      return 0;
 
-          if (VV->getType() == Ty)
-            return VV;
-        }
-      }
+    for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
+      DIGlobalVariable DIG(cast_or_null<MDNode>(NMD->getElement(i)));
+      if (DIG.isNull())
+        continue;
+      if (DIG.getGlobal() == V)
+        return DIG.getNode();
     }
-    
-    if (Val->getType() == Ty)
-      return Val;
-
     return 0;
   }
 
@@ -990,8 +1232,8 @@ namespace llvm {
     return 0;
   }
 
-  bool getLocationInfo(const Value *V, std::string &DisplayName,
-                       std::string &Type, unsigned &LineNo, std::string &File,
+bool getLocationInfo(const Value *V, std::string &DisplayName,
+                     std::string &Type, unsigned &LineNo, std::string &File,
                        std::string &Dir) {
     DICompileUnit Unit;
     DIType TypeD;
@@ -999,81 +1241,56 @@ namespace llvm {
     if (GlobalVariable *GV = dyn_cast<GlobalVariable>(const_cast<Value*>(V))) {
       Value *DIGV = findDbgGlobalDeclare(GV);
       if (!DIGV) return false;
-      DIGlobalVariable Var(cast<GlobalVariable>(DIGV));
+      DIGlobalVariable Var(cast<MDNode>(DIGV));
 
-      Var.getDisplayName(DisplayName);
+      if (const char *D = Var.getDisplayName())
+        DisplayName = D;
       LineNo = Var.getLineNumber();
       Unit = Var.getCompileUnit();
       TypeD = Var.getType();
     } else {
       const DbgDeclareInst *DDI = findDbgDeclare(V);
       if (!DDI) return false;
-      DIVariable Var(cast<GlobalVariable>(DDI->getVariable()));
+      DIVariable Var(cast<MDNode>(DDI->getVariable()));
 
-      Var.getName(DisplayName);
+      if (const char *D = Var.getName())
+        DisplayName = D;
       LineNo = Var.getLineNumber();
       Unit = Var.getCompileUnit();
       TypeD = Var.getType();
     }
 
-    TypeD.getName(Type);
-    Unit.getFilename(File);
-    Unit.getDirectory(Dir);
+    if (const char *T = TypeD.getName())
+      Type = T;
+    if (const char *F = Unit.getFilename())
+      File = F;
+    if (const char *D = Unit.getDirectory())
+      Dir = D;
     return true;
   }
 
-  /// CollectDebugInfoAnchors - Collect debugging information anchors.
-  void CollectDebugInfoAnchors(Module &M,
-                               SmallVector<GlobalVariable *, 2> &CUs,
-                               SmallVector<GlobalVariable *, 4> &GVs,
-                               SmallVector<GlobalVariable *, 4> &SPs) {
-
-    for (Module::global_iterator GVI = M.global_begin(), E = M.global_end();
-       GVI != E; GVI++) {
-      GlobalVariable *GV = GVI;
-      if (GV->hasName() && strncmp(GV->getNameStart(), "llvm.dbg", 8) == 0
-          && GV->isConstant() && GV->hasInitializer()) {
-        DICompileUnit C(GV);
-        if (C.isNull() == false) {
-          CUs.push_back(GV);
-          continue;
-        }
-        DIGlobalVariable G(GV);
-        if (G.isNull() == false) {
-          GVs.push_back(GV);
-          continue;
-        }
-        DISubprogram S(GV);
-        if (S.isNull() == false) {
-          SPs.push_back(GV);
-          continue;
-        }
-      }
-    }
-  }
-
-  /// isValidDebugInfoIntrinsic - Return true if SPI is a valid debug 
+  /// isValidDebugInfoIntrinsic - Return true if SPI is a valid debug
   /// info intrinsic.
-  bool isValidDebugInfoIntrinsic(DbgStopPointInst &SPI, 
+  bool isValidDebugInfoIntrinsic(DbgStopPointInst &SPI,
                                  CodeGenOpt::Level OptLev) {
     return DIDescriptor::ValidDebugInfo(SPI.getContext(), OptLev);
   }
 
-  /// isValidDebugInfoIntrinsic - Return true if FSI is a valid debug 
+  /// isValidDebugInfoIntrinsic - Return true if FSI is a valid debug
   /// info intrinsic.
   bool isValidDebugInfoIntrinsic(DbgFuncStartInst &FSI,
                                  CodeGenOpt::Level OptLev) {
     return DIDescriptor::ValidDebugInfo(FSI.getSubprogram(), OptLev);
   }
 
-  /// isValidDebugInfoIntrinsic - Return true if RSI is a valid debug 
+  /// isValidDebugInfoIntrinsic - Return true if RSI is a valid debug
   /// info intrinsic.
   bool isValidDebugInfoIntrinsic(DbgRegionStartInst &RSI,
                                  CodeGenOpt::Level OptLev) {
     return DIDescriptor::ValidDebugInfo(RSI.getContext(), OptLev);
   }
 
-  /// isValidDebugInfoIntrinsic - Return true if REI is a valid debug 
+  /// isValidDebugInfoIntrinsic - Return true if REI is a valid debug
   /// info intrinsic.
   bool isValidDebugInfoIntrinsic(DbgRegionEndInst &REI,
                                  CodeGenOpt::Level OptLev) {
@@ -1081,14 +1298,14 @@ namespace llvm {
   }
 
 
-  /// isValidDebugInfoIntrinsic - Return true if DI is a valid debug 
+  /// isValidDebugInfoIntrinsic - Return true if DI is a valid debug
   /// info intrinsic.
   bool isValidDebugInfoIntrinsic(DbgDeclareInst &DI,
                                  CodeGenOpt::Level OptLev) {
     return DIDescriptor::ValidDebugInfo(DI.getVariable(), OptLev);
   }
 
-  /// ExtractDebugLocation - Extract debug location information 
+  /// ExtractDebugLocation - Extract debug location information
   /// from llvm.dbg.stoppoint intrinsic.
   DebugLoc ExtractDebugLocation(DbgStopPointInst &SPI,
                                 DebugLocTracker &DebugLocInfo) {
@@ -1096,7 +1313,7 @@ namespace llvm {
     Value *Context = SPI.getContext();
 
     // If this location is already tracked then use it.
-    DebugLocTuple Tuple(cast<GlobalVariable>(Context), SPI.getLine(), 
+    DebugLocTuple Tuple(cast<MDNode>(Context), NULL, SPI.getLine(),
                         SPI.getColumn());
     DenseMap<DebugLocTuple, unsigned>::iterator II
       = DebugLocInfo.DebugIdMap.find(Tuple);
@@ -1107,23 +1324,48 @@ namespace llvm {
     unsigned Id = DebugLocInfo.DebugLocations.size();
     DebugLocInfo.DebugLocations.push_back(Tuple);
     DebugLocInfo.DebugIdMap[Tuple] = Id;
-    
+
+    return DebugLoc::get(Id);
+  }
+
+  /// ExtractDebugLocation - Extract debug location information
+  /// from DILocation.
+  DebugLoc ExtractDebugLocation(DILocation &Loc,
+                                DebugLocTracker &DebugLocInfo) {
+    DebugLoc DL;
+    MDNode *Context = Loc.getScope().getNode();
+    MDNode *InlinedLoc = NULL;
+    if (!Loc.getOrigLocation().isNull())
+      InlinedLoc = Loc.getOrigLocation().getNode();
+    // If this location is already tracked then use it.
+    DebugLocTuple Tuple(Context, InlinedLoc, Loc.getLineNumber(),
+                        Loc.getColumnNumber());
+    DenseMap<DebugLocTuple, unsigned>::iterator II
+      = DebugLocInfo.DebugIdMap.find(Tuple);
+    if (II != DebugLocInfo.DebugIdMap.end())
+      return DebugLoc::get(II->second);
+
+    // Add a new location entry.
+    unsigned Id = DebugLocInfo.DebugLocations.size();
+    DebugLocInfo.DebugLocations.push_back(Tuple);
+    DebugLocInfo.DebugIdMap[Tuple] = Id;
+
     return DebugLoc::get(Id);
   }
 
-  /// ExtractDebugLocation - Extract debug location information 
+  /// ExtractDebugLocation - Extract debug location information
   /// from llvm.dbg.func_start intrinsic.
   DebugLoc ExtractDebugLocation(DbgFuncStartInst &FSI,
                                 DebugLocTracker &DebugLocInfo) {
     DebugLoc DL;
     Value *SP = FSI.getSubprogram();
 
-    DISubprogram Subprogram(cast<GlobalVariable>(SP));
+    DISubprogram Subprogram(cast<MDNode>(SP));
     unsigned Line = Subprogram.getLineNumber();
     DICompileUnit CU(Subprogram.getCompileUnit());
 
     // If this location is already tracked then use it.
-    DebugLocTuple Tuple(CU.getGV(), Line, /* Column */ 0);
+    DebugLocTuple Tuple(CU.getNode(), NULL, Line, /* Column */ 0);
     DenseMap<DebugLocTuple, unsigned>::iterator II
       = DebugLocInfo.DebugIdMap.find(Tuple);
     if (II != DebugLocInfo.DebugIdMap.end())
@@ -1133,13 +1375,13 @@ namespace llvm {
     unsigned Id = DebugLocInfo.DebugLocations.size();
     DebugLocInfo.DebugLocations.push_back(Tuple);
     DebugLocInfo.DebugIdMap[Tuple] = Id;
-    
+
     return DebugLoc::get(Id);
   }
 
   /// isInlinedFnStart - Return true if FSI is starting an inlined function.
   bool isInlinedFnStart(DbgFuncStartInst &FSI, const Function *CurrentFn) {
-    DISubprogram Subprogram(cast<GlobalVariable>(FSI.getSubprogram()));
+    DISubprogram Subprogram(cast<MDNode>(FSI.getSubprogram()));
     if (Subprogram.describes(CurrentFn))
       return false;
 
@@ -1148,11 +1390,10 @@ namespace llvm {
 
   /// isInlinedFnEnd - Return true if REI is ending an inlined function.
   bool isInlinedFnEnd(DbgRegionEndInst &REI, const Function *CurrentFn) {
-    DISubprogram Subprogram(cast<GlobalVariable>(REI.getContext()));
+    DISubprogram Subprogram(cast<MDNode>(REI.getContext()));
     if (Subprogram.isNull() || Subprogram.describes(CurrentFn))
       return false;
 
     return true;
   }
-
 }