Switch the code generator (except the JIT) onto the new DebugLoc

representation.  This eliminates the 'DILocation' MDNodes for 
file/line/col tuples from -O0 -g codegen.

This remove the old DebugLoc class, making it a typedef for DebugLoc,
I'll rename NewDebugLoc next.

I didn't update the JIT to use the new apis, so it will continue to
work, but be as slow as before.  Someone should eventually do this
or, better yet, rip out the JIT debug info stuff and build the JIT
on top of MC.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100209 91177308-0d34-0410-b5e6-96231b3b80d8

16 files changed, 128 insertions, 203 deletions

diff --git a/include/llvm/Analysis/DebugInfo.h b/include/llvm/Analysis/DebugInfo.h
index 4e8c4c8..d68bfa3 100644
--- a/include/llvm/Analysis/DebugInfo.h
+++ b/include/llvm/Analysis/DebugInfo.h
@@ -31,8 +31,6 @@ namespace llvm {
   class Type;
   class Value;
   class DbgDeclareInst;
-  class DebugLoc;
-  struct DebugLocTracker;
   class Instruction;
   class MDNode;
   class LLVMContext;
@@ -710,11 +708,6 @@ namespace llvm {
                        std::string &Type, unsigned &LineNo, std::string &File,
                        std::string &Dir);
 
-  /// ExtractDebugLocation - Extract debug location information
-  /// from DILocation.
-  DebugLoc ExtractDebugLocation(DILocation &Loc,
-                                DebugLocTracker &DebugLocInfo);
-
   /// getDISubprogram - Find subprogram that is enclosing this scope.
   DISubprogram getDISubprogram(MDNode *Scope);
 
diff --git a/include/llvm/CodeGen/MachineFunction.h b/include/llvm/CodeGen/MachineFunction.h
index 76ec9db..59b1718 100644
--- a/include/llvm/CodeGen/MachineFunction.h
+++ b/include/llvm/CodeGen/MachineFunction.h
@@ -26,7 +26,6 @@
 
 namespace llvm {
 
-class DILocation;
 class Value;
 class Function;
 class MachineRegisterInfo;
@@ -112,9 +111,6 @@ class MachineFunction {
   // of a function.
   DebugLoc DefaultDebugLoc;
 
-  // Tracks debug locations.
-  DebugLocTracker DebugLocInfo;
-
   /// FunctionNumber - This provides a unique ID for each function emitted in
   /// this translation unit.
   ///
@@ -402,9 +398,6 @@ public:
   // Debug location.
   //
 
-  /// getDILocation - Get the DILocation for a given DebugLoc object.
-  DILocation getDILocation(DebugLoc DL) const;
-
   /// getDefaultDebugLoc - Get the default debug location for the machine
   /// function.
   DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
@@ -412,9 +405,6 @@ public:
   /// setDefaultDebugLoc - Get the default debug location for the machine
   /// function.
   void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
-
-  /// getDebugLocInfo - Get the debug info location tracker.
-  DebugLocTracker &getDebugLocInfo() { return DebugLocInfo; }
 };
 
 //===--------------------------------------------------------------------===//
diff --git a/include/llvm/CodeGen/MachineModuleInfo.h b/include/llvm/CodeGen/MachineModuleInfo.h
index d446eae..d610390 100644
--- a/include/llvm/CodeGen/MachineModuleInfo.h
+++ b/include/llvm/CodeGen/MachineModuleInfo.h
@@ -37,6 +37,7 @@
 #include "llvm/CodeGen/MachineLocation.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/Support/Dwarf.h"
+#include "llvm/Support/DebugLoc.h"
 #include "llvm/Support/ValueHandle.h"
 #include "llvm/System/DataTypes.h"
 #include "llvm/ADT/DenseMap.h"
@@ -156,8 +157,8 @@ class MachineModuleInfo : public ImmutablePass {
 public:
   static char ID; // Pass identification, replacement for typeid
 
-  typedef std::pair<unsigned, TrackingVH<MDNode> > UnsignedAndMDNodePair;
-  typedef SmallVector< std::pair<TrackingVH<MDNode>, UnsignedAndMDNodePair>, 4>
+  typedef std::pair<unsigned, DebugLoc> UnsignedDebugLocPair;
+  typedef SmallVector<std::pair<TrackingVH<MDNode>, UnsignedDebugLocPair>, 4>
     VariableDbgInfoMapTy;
   VariableDbgInfoMapTy VariableDbgInfo;
 
@@ -330,10 +331,10 @@ public:
   /// of one is required to emit exception handling info.
   Function *getPersonality() const;
 
-  /// setVariableDbgInfo - Collect information used to emit debugging information
-  /// of a variable.
-  void setVariableDbgInfo(MDNode *N, unsigned Slot, MDNode *Scope) {
-    VariableDbgInfo.push_back(std::make_pair(N, std::make_pair(Slot, Scope)));
+  /// setVariableDbgInfo - Collect information used to emit debugging
+  /// information of a variable.
+  void setVariableDbgInfo(MDNode *N, unsigned Slot, DebugLoc Loc) {
+    VariableDbgInfo.push_back(std::make_pair(N, std::make_pair(Slot, Loc)));
   }
 
   VariableDbgInfoMapTy &getVariableDbgInfo() {  return VariableDbgInfo;  }
diff --git a/include/llvm/Support/DebugLoc.h b/include/llvm/Support/DebugLoc.h
index ede1ed3..2da632c 100644
--- a/include/llvm/Support/DebugLoc.h
+++ b/include/llvm/Support/DebugLoc.h
@@ -77,44 +77,16 @@ namespace llvm {
       return LineCol == DL.LineCol && ScopeIdx == DL.ScopeIdx;
     }
     bool operator!=(const NewDebugLoc &DL) const { return !(*this == DL); }
+    
+    
+    
+    
+    static NewDebugLoc getUnknownLoc() { NewDebugLoc L; return L; }
   };
   
   
+  typedef NewDebugLoc DebugLoc;
 
-  /// DebugLoc - Debug location id. This is carried by SDNode and MachineInstr
-  /// to index into a vector of unique debug location tuples.
-  class DebugLoc {
-    unsigned Idx;
-  public:
-    DebugLoc() : Idx(~0U) {}  // Defaults to invalid.
-
-    static DebugLoc getUnknownLoc()   { DebugLoc L; L.Idx = ~0U; return L; }
-    static DebugLoc get(unsigned idx) { DebugLoc L; L.Idx = idx; return L; }
-
-    unsigned getIndex() const { return Idx; }
-
-    /// isUnknown - Return true if there is no debug info for the SDNode /
-    /// MachineInstr.
-    bool isUnknown() const { return Idx == ~0U; }
-
-    bool operator==(const DebugLoc &DL) const { return Idx == DL.Idx; }
-    bool operator!=(const DebugLoc &DL) const { return !(*this == DL); }
-  };
-
-  /// DebugLocTracker - This class tracks debug location information.
-  ///
-  struct DebugLocTracker {
-    /// DebugLocations - A vector of unique DebugLocTuple's.
-    ///
-    std::vector<MDNode *> DebugLocations;
-
-    /// DebugIdMap - This maps DebugLocTuple's to indices into the
-    /// DebugLocations vector.
-    DenseMap<MDNode *, unsigned> DebugIdMap;
-
-    DebugLocTracker() {}
-  };
-  
 } // end namespace llvm
 
 #endif /* LLVM_DEBUGLOC_H */
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index f12552d..0bafd65 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -24,7 +24,6 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Dwarf.h"
-#include "llvm/Support/DebugLoc.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 using namespace llvm::dwarf;
@@ -1372,23 +1371,6 @@ bool llvm::getLocationInfo(const Value *V, std::string &DisplayName,
   return true;
 }
 
-/// ExtractDebugLocation - Extract debug location information
-/// from DILocation.
-DebugLoc llvm::ExtractDebugLocation(DILocation &Loc,
-                                    DebugLocTracker &DebugLocInfo) {
-  DenseMap<MDNode *, unsigned>::iterator II
-    = DebugLocInfo.DebugIdMap.find(Loc.getNode());
-  if (II != DebugLocInfo.DebugIdMap.end())
-    return DebugLoc::get(II->second);
-
-  // Add a new location entry.
-  unsigned Id = DebugLocInfo.DebugLocations.size();
-  DebugLocInfo.DebugLocations.push_back(Loc.getNode());
-  DebugLocInfo.DebugIdMap[Loc.getNode()] = Id;
-
-  return DebugLoc::get(Id);
-}
-
 /// getDISubprogram - Find subprogram that is enclosing this scope.
 DISubprogram llvm::getDISubprogram(MDNode *Scope) {
   DIDescriptor D(Scope);
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 3e71d18..625a2b9 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -340,19 +340,17 @@ static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
   const MachineFunction *MF = MI.getParent()->getParent();
   const TargetMachine &TM = MF->getTarget();
   
-  if (!MI.getDebugLoc().isUnknown()) {
-    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
-    
-    // Print source line info.
-    DIScope Scope = DLT.getScope();
+  DebugLoc DL = MI.getDebugLoc();
+  if (!DL.isUnknown()) {          // Print source line info.
+    DIScope Scope(DL.getScope(MF->getFunction()->getContext()));
     // Omit the directory, because it's likely to be long and uninteresting.
     if (Scope.Verify())
       CommentOS << Scope.getFilename();
     else
       CommentOS << "<unknown>";
-    CommentOS << ':' << DLT.getLineNumber();
-    if (DLT.getColumnNumber() != 0)
-      CommentOS << ':' << DLT.getColumnNumber();
+    CommentOS << ':' << DL.getLine();
+    if (DL.getCol() != 0)
+      CommentOS << ':' << DL.getCol();
     CommentOS << '\n';
   }
   
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index fb91d4f..9084456 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -302,7 +302,7 @@ DwarfDebug::DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T)
   : DwarfPrinter(OS, A, T), ModuleCU(0),
     AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(),
     DIEBlocks(), SectionSourceLines(), didInitial(false), shouldEmit(false),
-    CurrentFnDbgScope(0), PrevDILoc(0), DebugTimer(0) {
+    CurrentFnDbgScope(0), DebugTimer(0) {
   NextStringPoolNumber = 0;
   if (TimePassesIsEnabled)
     DebugTimer = new Timer("Dwarf Debug Writer");
@@ -1932,13 +1932,14 @@ void DwarfDebug::endModule() {
 /// findAbstractVariable - Find abstract variable, if any, associated with Var.
 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
                                               unsigned FrameIdx,
-                                              DILocation &ScopeLoc) {
+                                              DebugLoc ScopeLoc) {
 
   DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var.getNode());
   if (AbsDbgVariable)
     return AbsDbgVariable;
 
-  DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope().getNode());
+  LLVMContext &Ctx = Var.getNode()->getContext();
+  DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope(Ctx));
   if (!Scope)
     return NULL;
 
@@ -1953,13 +1954,14 @@ DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
 /// FIXME : Refactor findAbstractVariable.
 DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
                                               const MachineInstr *MI,
-                                              DILocation &ScopeLoc) {
+                                              DebugLoc ScopeLoc) {
 
   DbgVariable *AbsDbgVariable = AbstractVariables.lookup(Var.getNode());
   if (AbsDbgVariable)
     return AbsDbgVariable;
 
-  DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope().getNode());
+  LLVMContext &Ctx = Var.getNode()->getContext();
+  DbgScope *Scope = AbstractScopes.lookup(ScopeLoc.getScope(Ctx));
   if (!Scope)
     return NULL;
 
@@ -1975,24 +1977,27 @@ DbgVariable *DwarfDebug::findAbstractVariable(DIVariable &Var,
 void DwarfDebug::collectVariableInfo() {
   if (!MMI) return;
 
+  const LLVMContext &Ctx = MF->getFunction()->getContext();
+
   MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
   for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
          VE = VMap.end(); VI != VE; ++VI) {
     MDNode *Var = VI->first;
     if (!Var) continue;
-    DIVariable DV (Var);
-    std::pair< unsigned, MDNode *> VP = VI->second;
-    DILocation ScopeLoc(VP.second);
-
-    DbgScope *Scope =
-      ConcreteScopes.lookup(ScopeLoc.getOrigLocation().getNode());
-    if (!Scope)
-      Scope = DbgScopeMap.lookup(ScopeLoc.getScope().getNode());
+    DIVariable DV(Var);
+    const std::pair<unsigned, DebugLoc> &VP = VI->second;
+
+    DbgScope *Scope = 0;
+    if (MDNode *IA = VP.second.getInlinedAt(Ctx))
+      Scope = ConcreteScopes.lookup(IA);
+    if (Scope == 0)
+      Scope = DbgScopeMap.lookup(VP.second.getScope(Ctx));
+    
     // If variable scope is not found then skip this variable.
-    if (!Scope)
+    if (Scope == 0)
       continue;
 
-    DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.first, ScopeLoc);
+    DbgVariable *AbsDbgVariable = findAbstractVariable(DV, VP.first, VP.second);
     DbgVariable *RegVar = new DbgVariable(DV, VP.first, AbsDbgVariable);
     Scope->addVariable(RegVar);
   }
@@ -2021,16 +2026,17 @@ void DwarfDebug::collectVariableInfo() {
 
       DebugLoc DL = MInsn->getDebugLoc();
       if (DL.isUnknown()) continue;
-      DILocation ScopeLoc = MF->getDILocation(DL);
-      DbgScope *Scope =
-        ConcreteScopes.lookup(ScopeLoc.getOrigLocation().getNode());
-      if (!Scope)
-        Scope = DbgScopeMap.lookup(ScopeLoc.getScope().getNode());
+      DbgScope *Scope = 0;
+      if (MDNode *IA = DL.getInlinedAt(Ctx))
+        Scope = ConcreteScopes.lookup(IA);
+      if (Scope == 0)
+        Scope = DbgScopeMap.lookup(DL.getScope(Ctx));
+      
       // If variable scope is not found then skip this variable.
-      if (!Scope)
+      if (Scope == 0)
         continue;
 
-      DbgVariable *AbsDbgVariable = findAbstractVariable(DV, MInsn, ScopeLoc);
+      DbgVariable *AbsDbgVariable = findAbstractVariable(DV, MInsn, DL);
       DbgVariable *RegVar = new DbgVariable(DV, MInsn, AbsDbgVariable);
       DbgValueStartMap[MInsn] = RegVar;
       Scope->addVariable(RegVar);
@@ -2044,12 +2050,15 @@ void DwarfDebug::beginScope(const MachineInstr *MI) {
   DebugLoc DL = MI->getDebugLoc();
   if (DL.isUnknown())
     return;
-  DILocation DILoc = MF->getDILocation(DL);
-  if (!DILoc.getScope().Verify())
-    return;
 
   // Check and update last known location info.
-  if(DILoc.getNode() == PrevDILoc)
+  if (DL == PrevInstLoc)
+    return;
+  
+  MDNode *Scope = DL.getScope(MF->getFunction()->getContext());
+  
+  // FIXME: Should only verify each scope once!
+  if (!DIScope(Scope).Verify())
     return;
 
   // DBG_VALUE instruction establishes new value.
@@ -2057,10 +2066,8 @@ void DwarfDebug::beginScope(const MachineInstr *MI) {
     DenseMap<const MachineInstr *, DbgVariable *>::iterator DI
       = DbgValueStartMap.find(MI);
     if (DI != DbgValueStartMap.end()) {
-      MCSymbol *Label = recordSourceLine(DILoc.getLineNumber(),
-                                         DILoc.getColumnNumber(),
-                                         DILoc.getScope().getNode());
-      PrevDILoc = DILoc.getNode();
+      MCSymbol *Label = recordSourceLine(DL.getLine(), DL.getCol(), Scope);
+      PrevInstLoc = DL;
       DI->second->setDbgValueLabel(Label);
     }
     return;
@@ -2068,10 +2075,8 @@ void DwarfDebug::beginScope(const MachineInstr *MI) {
 
   // Emit a label to indicate location change. This is used for line 
   // table even if this instruction does start a new scope.
-  MCSymbol *Label = recordSourceLine(DILoc.getLineNumber(),
-                                     DILoc.getColumnNumber(),
-                                     DILoc.getScope().getNode());
-  PrevDILoc = DILoc.getNode();
+  MCSymbol *Label = recordSourceLine(DL.getLine(), DL.getCol(), Scope);
+  PrevInstLoc = DL;
 
   // update DbgScope if this instruction starts a new scope.
   InsnToDbgScopeMapTy::iterator I = DbgScopeBeginMap.find(MI);
@@ -2094,15 +2099,12 @@ void DwarfDebug::endScope(const MachineInstr *MI) {
   DebugLoc DL = MI->getDebugLoc();
   if (DL.isUnknown())
     return;
-  DILocation DILoc = MF->getDILocation(DL);
-  if (!DILoc.getScope().Verify())
-    return;
-  
+
   // Emit a label and update DbgScope if this instruction ends a scope.
   InsnToDbgScopeMapTy::iterator I = DbgScopeEndMap.find(MI);
   if (I == DbgScopeEndMap.end())
     return;
-
+  
   MCSymbol *Label = MMI->getContext().CreateTempSymbol();
   Asm->OutStreamer.EmitLabel(Label);
 
@@ -2115,7 +2117,6 @@ void DwarfDebug::endScope(const MachineInstr *MI) {
 
 /// createDbgScope - Create DbgScope for the scope.
 void DwarfDebug::createDbgScope(MDNode *Scope, MDNode *InlinedAt) {
-
   if (!InlinedAt) {
     DbgScope *WScope = DbgScopeMap.lookup(Scope);
     if (WScope)
@@ -2147,6 +2148,8 @@ bool DwarfDebug::extractScopeInformation() {
 
   DenseMap<const MachineInstr *, unsigned> MIIndexMap;
   unsigned MIIndex = 0;
+  LLVMContext &Ctx = MF->getFunction()->getContext();
+  
   // Scan each instruction and create scopes. First build working set of scopes.
   for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
        I != E; ++I) {
@@ -2156,16 +2159,17 @@ bool DwarfDebug::extractScopeInformation() {
       // FIXME : Remove DBG_VALUE check.
       if (MInsn->isDebugValue()) continue;
       MIIndexMap[MInsn] = MIIndex++;
+      
       DebugLoc DL = MInsn->getDebugLoc();
       if (DL.isUnknown()) continue;
-      DILocation DLT = MF->getDILocation(DL);
-      DIScope DLTScope = DLT.getScope();
-      if (!DLTScope.getNode()) continue;
+      
+      MDNode *Scope = DL.getScope(Ctx);
+      
       // There is no need to create another DIE for compile unit. For all
       // other scopes, create one DbgScope now. This will be translated
       // into a scope DIE at the end.
-      if (DLTScope.isCompileUnit()) continue;
-      createDbgScope(DLTScope.getNode(), DLT.getOrigLocation().getNode());
+      if (DIScope(Scope).isCompileUnit()) continue;
+      createDbgScope(Scope, DL.getInlinedAt(Ctx));
     }
   }
 
@@ -2179,17 +2183,17 @@ bool DwarfDebug::extractScopeInformation() {
       // FIXME : Remove DBG_VALUE check.
       if (MInsn->isDebugValue()) continue;
       DebugLoc DL = MInsn->getDebugLoc();
-      if (DL.isUnknown())  continue;
-      DILocation DLT = MF->getDILocation(DL);
-      DIScope DLTScope = DLT.getScope();
-      if (!DLTScope.getNode()) continue;
+      if (DL.isUnknown()) continue;
+
+      MDNode *Scope = DL.getScope(Ctx);
+      if (Scope == 0) continue;
+      
       // There is no need to create another DIE for compile unit. For all
       // other scopes, create one DbgScope now. This will be translated
       // into a scope DIE at the end.
-      if (DLTScope.isCompileUnit()) continue;
-      DbgScope *Scope = getUpdatedDbgScope(DLTScope.getNode(), MInsn, 
-                                           DLT.getOrigLocation().getNode());
-      Scope->setLastInsn(MInsn);
+      if (DIScope(Scope).isCompileUnit()) continue;
+      DbgScope *DScope = getUpdatedDbgScope(Scope, MInsn, DL.getInlinedAt(Ctx));
+      DScope->setLastInsn(MInsn);
     }
   }
 
@@ -2255,20 +2259,21 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
   // Emit label for the implicitly defined dbg.stoppoint at the start of the
   // function.
   DebugLoc FDL = MF->getDefaultDebugLoc();
-  if (!FDL.isUnknown()) {
-    DILocation DLT = MF->getDILocation(FDL);
-    DISubprogram SP = getDISubprogram(DLT.getScope().getNode());
-    unsigned Line, Col;
-    if (SP.Verify()) {
-      Line = SP.getLineNumber();
-      Col = 0;
-    } else {
-      Line = DLT.getLineNumber();
-      Col = DLT.getColumnNumber();
-    }
-    
-    recordSourceLine(Line, Col, DLT.getScope().getNode());
+  if (FDL.isUnknown()) return;
+  
+  MDNode *Scope = FDL.getScope(MF->getFunction()->getContext());
+  
+  DISubprogram SP = getDISubprogram(Scope);
+  unsigned Line, Col;
+  if (SP.Verify()) {
+    Line = SP.getLineNumber();
+    Col = 0;
+  } else {
+    Line = FDL.getLine();
+    Col = FDL.getCol();
   }
+  
+  recordSourceLine(Line, Col, Scope);
 }
 
 /// endFunction - Gather and emit post-function debug information.
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index ad6b0c2..03d9d99 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -195,7 +195,7 @@ class DwarfDebug : public DwarfPrinter {
 
   /// Previous instruction's location information. This is used to determine
   /// label location to indicate scope boundries in dwarf debug info.
-  mutable const MDNode *PrevDILoc;
+  DebugLoc PrevInstLoc;
 
   /// DebugTimer - Timer for the Dwarf debug writer.
   Timer *DebugTimer;
@@ -361,7 +361,8 @@ class DwarfDebug : public DwarfPrinter {
 
   /// getUpdatedDbgScope - Find or create DbgScope assicated with 
   /// the instruction. Initialize scope and update scope hierarchy.
-  DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
+  DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI,
+                               MDNode *InlinedAt);
 
   /// createDbgScope - Create DbgScope for the scope.
   void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
@@ -370,9 +371,9 @@ class DwarfDebug : public DwarfPrinter {
 
   /// findAbstractVariable - Find abstract variable associated with Var.
   DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx, 
-                                    DILocation &Loc);
+                                    DebugLoc Loc);
   DbgVariable *findAbstractVariable(DIVariable &Var, const MachineInstr *MI,
-                                    DILocation &Loc);
+                                    DebugLoc Loc);
 
   /// updateSubprogramScopeDIE - Find DIE for the given subprogram and 
   /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index f6cc71f..edc6d8d 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -436,15 +436,6 @@ unsigned MachineFunction::addLiveIn(unsigned PReg,
   return VReg;
 }
 
-/// getDILocation - Get the DILocation for a given DebugLoc object.
-DILocation MachineFunction::getDILocation(DebugLoc DL) const {
-  unsigned Idx = DL.getIndex();
-  assert(Idx < DebugLocInfo.DebugLocations.size() &&
-         "Invalid index into debug locations!");
-  return DILocation(DebugLocInfo.DebugLocations[Idx]);
-}
-
-
 /// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
 /// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
 /// normal 'L' label is returned.
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 40d6b20..2ac76f3 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1221,17 +1221,16 @@ void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
 
     // TODO: print InlinedAtLoc information
 
-    DILocation DLT = MF->getDILocation(debugLoc);
-    DIScope Scope = DLT.getScope();
+    DIScope Scope(debugLoc.getScope(MF->getFunction()->getContext()));
     OS << " dbg:";
     // Omit the directory, since it's usually long and uninteresting.
     if (Scope.Verify())
       OS << Scope.getFilename();
     else
       OS << "<unknown>";
-    OS << ':' << DLT.getLineNumber();
-    if (DLT.getColumnNumber() != 0)
-      OS << ':' << DLT.getColumnNumber();
+    OS << ':' << debugLoc.getLine();
+    if (debugLoc.getCol() != 0)
+      OS << ':' << debugLoc.getCol();
   }
 
   OS << "\n";
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index e4e9ef4..d6f8a20 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -340,8 +340,8 @@ bool FastISel::SelectCall(User *I) {
       StaticAllocaMap.find(AI);
     if (SI == StaticAllocaMap.end()) break; // VLAs.
     int FI = SI->second;
-    if (MDNode *Dbg = DI->getDbgMetadata())
-      MMI->setVariableDbgInfo(DI->getVariable(), FI, Dbg);
+    if (!DI->getDebugLoc().isUnknown())
+      MMI->setVariableDbgInfo(DI->getVariable(), FI, DI->getDebugLoc());
     
     // Building the map above is target independent.  Generating DBG_VALUE
     // inline is target dependent; do this now.
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 922c6e8..59ac24b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3800,8 +3800,8 @@ SelectionDAGBuilder::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
     int FI = SI->second;
 
     if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo())
-      if (MDNode *Dbg = DI.getDbgMetadata())
-        MMI->setVariableDbgInfo(Variable, FI, Dbg);
+      if (!DI.getDebugLoc().isUnknown())
+        MMI->setVariableDbgInfo(Variable, FI, DI.getDebugLoc());
     return 0;
   }
   case Intrinsic::dbg_value: {
@@ -3851,9 +3851,10 @@ SelectionDAGBuilder::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
     if (SI == FuncInfo.StaticAllocaMap.end())
       return 0; // VLAs.
     int FI = SI->second;
+    
     if (MachineModuleInfo *MMI = DAG.getMachineModuleInfo())
-      if (MDNode *Dbg = DI.getDbgMetadata())
-        MMI->setVariableDbgInfo(Variable, FI, Dbg);
+      if (!DI.getDebugLoc().isUnknown())
+        MMI->setVariableDbgInfo(Variable, FI, DI.getDebugLoc());
     return 0;
   }
   case Intrinsic::eh_exception: {
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index ea96b21..963abd9 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -368,21 +368,18 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
 /// attached with this instruction.
 static void SetDebugLoc(Instruction *I, SelectionDAGBuilder *SDB,
                         FastISel *FastIS, MachineFunction *MF) {
-  MDNode *Dbg = I->getDbgMetadata();
-  if (Dbg == 0) return;
+  DebugLoc DL = I->getDebugLoc();
+  if (DL.isUnknown()) return;
   
-  DILocation DILoc(Dbg);
-  DebugLoc Loc = ExtractDebugLocation(DILoc, MF->getDebugLocInfo());
-
-  SDB->setCurDebugLoc(Loc);
+  SDB->setCurDebugLoc(DL);
 
   if (FastIS)
-    FastIS->setCurDebugLoc(Loc);
+    FastIS->setCurDebugLoc(DL);
 
   // If the function doesn't have a default debug location yet, set
   // it. This is kind of a hack.
   if (MF->getDefaultDebugLoc().isUnknown())
-    MF->setDefaultDebugLoc(Loc);
+    MF->setDefaultDebugLoc(DL);
 }
 
 /// ResetDebugLoc - Set MF's and SDB's DebugLocs to Unknown.
diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp
index 83acb5d..a2df2d0 100644
--- a/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -821,21 +821,20 @@ void *JITEmitter::getPointerToGVIndirectSym(GlobalValue *V, void *Reference) {
 }
 
 void JITEmitter::processDebugLoc(DebugLoc DL, bool BeforePrintingInsn) {
-  if (!DL.isUnknown()) {
-    DILocation CurDLT = EmissionDetails.MF->getDILocation(DL);
-
-    if (BeforePrintingInsn) {
-      if (CurDLT.getScope().getNode() != 0 
-          && PrevDLT.getNode() != CurDLT.getNode()) {
-        JITEvent_EmittedFunctionDetails::LineStart NextLine;
-        NextLine.Address = getCurrentPCValue();
-        NextLine.Loc = DL;
-        EmissionDetails.LineStarts.push_back(NextLine);
-      }
+  if (DL.isUnknown()) return;
+  if (!BeforePrintingInsn) return;
 
-      PrevDLT = CurDLT;
-    }
+  // FIXME: This is horribly inefficient.
+  DILocation CurDLT(DL.getAsMDNode(CurFn->getContext()));
+  
+  if (CurDLT.getScope().getNode() != 0 && PrevDLT.getNode() !=CurDLT.getNode()){
+    JITEvent_EmittedFunctionDetails::LineStart NextLine;
+    NextLine.Address = getCurrentPCValue();
+    NextLine.Loc = DL;
+    EmissionDetails.LineStarts.push_back(NextLine);
   }
+
+  PrevDLT = CurDLT;
 }
 
 static unsigned GetConstantPoolSizeInBytes(MachineConstantPool *MCP,
diff --git a/lib/Target/PIC16/PIC16DebugInfo.cpp b/lib/Target/PIC16/PIC16DebugInfo.cpp
index da4e027..a223540 100644
--- a/lib/Target/PIC16/PIC16DebugInfo.cpp
+++ b/lib/Target/PIC16/PIC16DebugInfo.cpp
@@ -256,15 +256,11 @@ void PIC16DbgInfo::BeginFunction(const MachineFunction &MF) {
 ///
 void PIC16DbgInfo::ChangeDebugLoc(const MachineFunction &MF,  
                                   const DebugLoc &DL, bool IsInBeginFunction) {
-  if (! EmitDebugDirectives) return;
-  assert (! DL.isUnknown()  && "can't change to invalid debug loc");
-
-  DILocation Loc = MF.getDILocation(DL);
-  MDNode *CU = Loc.getScope().getNode();
-  unsigned line = Loc.getLineNumber();
+  if (!EmitDebugDirectives) return;
+  assert(!DL.isUnknown() && "can't change to invalid debug loc");
 
-  SwitchToCU(CU);
-  SwitchToLine(line, IsInBeginFunction);
+  SwitchToCU(DL.getScope(MF.getFunction()->getContext()));
+  SwitchToLine(DL.getLine(), IsInBeginFunction);
 }
 
 /// SwitchToLine - Emit line directive for a new line.
diff --git a/lib/Target/PIC16/PIC16DebugInfo.h b/lib/Target/PIC16/PIC16DebugInfo.h
index 54e27c7..4e5fb87 100644
--- a/lib/Target/PIC16/PIC16DebugInfo.h
+++ b/lib/Target/PIC16/PIC16DebugInfo.h
@@ -19,7 +19,7 @@
 
 namespace llvm {
   class MachineFunction;
-  class DebugLoc;
+  class NewDebugLoc; typedef NewDebugLoc DebugLoc;
   namespace PIC16Dbg {
     enum VarType {
       T_NULL,