diff --git a/include/llvm/CodeGen/AsmPrinter.h b/include/llvm/CodeGen/AsmPrinter.h
index 5292153..08c3197 100644
--- a/include/llvm/CodeGen/AsmPrinter.h
+++ b/include/llvm/CodeGen/AsmPrinter.h
@@ -34,6 +34,7 @@
   class Mangler;
   class TargetAsmInfo;
   class Type;
+  class raw_ostream;
 
   /// AsmPrinter - This class is intended to be used as a driving class for all
   /// asm writers.
@@ -64,7 +65,7 @@
   public:
     /// Output stream on which we're printing assembly code.
     ///
-    std::ostream &O;
+    raw_ostream &O;
 
     /// Target machine description.
     ///
@@ -96,7 +97,7 @@
     bool IsInTextSection;
   
   protected:
-    AsmPrinter(std::ostream &o, TargetMachine &TM, const TargetAsmInfo *T);
+    AsmPrinter(raw_ostream &o, TargetMachine &TM, const TargetAsmInfo *T);
     
   public:
     virtual ~AsmPrinter();
diff --git a/include/llvm/CodeGen/DwarfWriter.h b/include/llvm/CodeGen/DwarfWriter.h
index a0cfec7..981513b 100644
--- a/include/llvm/CodeGen/DwarfWriter.h
+++ b/include/llvm/CodeGen/DwarfWriter.h
@@ -31,6 +31,7 @@
 class MachineFunction;
 class Module;
 class TargetAsmInfo;
+class raw_ostream;
 
 //===----------------------------------------------------------------------===//
 // DwarfWriter - Emits Dwarf debug and exception handling directives.
@@ -48,7 +49,7 @@
   
 public:
   
-  DwarfWriter(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T);
+  DwarfWriter(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T);
   virtual ~DwarfWriter();
   
   /// SetModuleInfo - Set machine module info when it's known that pass manager
diff --git a/include/llvm/CodeGen/FileWriters.h b/include/llvm/CodeGen/FileWriters.h
index ac66b9d..cb7aea4 100644
--- a/include/llvm/CodeGen/FileWriters.h
+++ b/include/llvm/CodeGen/FileWriters.h
@@ -21,10 +21,11 @@
   class PassManagerBase;
   class MachineCodeEmitter;
   class TargetMachine;
+  class raw_ostream;
 
-  MachineCodeEmitter *AddELFWriter(PassManagerBase &FPM, std::ostream &O,
+  MachineCodeEmitter *AddELFWriter(PassManagerBase &FPM, raw_ostream &O,
                                    TargetMachine &TM);
-  MachineCodeEmitter *AddMachOWriter(PassManagerBase &FPM, std::ostream &O,
+  MachineCodeEmitter *AddMachOWriter(PassManagerBase &FPM, raw_ostream &O,
                                      TargetMachine &TM);
 
 } // end llvm namespace
diff --git a/include/llvm/CodeGen/GCMetadataPrinter.h b/include/llvm/CodeGen/GCMetadataPrinter.h
index 1ab138a..1c0665b 100644
--- a/include/llvm/CodeGen/GCMetadataPrinter.h
+++ b/include/llvm/CodeGen/GCMetadataPrinter.h
@@ -29,6 +29,7 @@
 namespace llvm {
   
   class GCMetadataPrinter;
+  class raw_ostream;
   
   /// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the
   /// defaults from Registry.
@@ -63,10 +64,10 @@
     iterator end()   { return S->end();   }
     
     /// beginAssembly/finishAssembly - Emit module metadata as assembly code.
-    virtual void beginAssembly(std::ostream &OS, AsmPrinter &AP,
+    virtual void beginAssembly(raw_ostream &OS, AsmPrinter &AP,
                                const TargetAsmInfo &TAI);
     
-    virtual void finishAssembly(std::ostream &OS, AsmPrinter &AP,
+    virtual void finishAssembly(raw_ostream &OS, AsmPrinter &AP,
                                 const TargetAsmInfo &TAI);
     
     virtual ~GCMetadataPrinter();
diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h
index 471cebe..c9506f1 100644
--- a/include/llvm/CodeGen/MachineInstr.h
+++ b/include/llvm/CodeGen/MachineInstr.h
@@ -258,6 +258,11 @@
   }
   void print(std::ostream &OS, const TargetMachine *TM = 0) const;
   void print(std::ostream *OS) const { if (OS) print(*OS); }
+  void print(raw_ostream *OS, const TargetMachine *TM) const {
+    if (OS) print(*OS, TM);
+  }
+  void print(raw_ostream &OS, const TargetMachine *TM = 0) const;
+  void print(raw_ostream *OS) const { if (OS) print(*OS); }
   void dump() const;
 
   //===--------------------------------------------------------------------===//
@@ -316,6 +321,11 @@
   return OS;
 }
 
+inline raw_ostream& operator<<(raw_ostream &OS, const MachineInstr &MI) {
+  MI.print(OS);
+  return OS;
+}
+
 } // End llvm namespace
 
 #endif
diff --git a/include/llvm/CodeGen/MachineOperand.h b/include/llvm/CodeGen/MachineOperand.h
index 05984f6..b4ba2f4 100644
--- a/include/llvm/CodeGen/MachineOperand.h
+++ b/include/llvm/CodeGen/MachineOperand.h
@@ -26,6 +26,7 @@
 class MachineInstr;
 class TargetMachine;
 class MachineRegisterInfo;
+class raw_ostream;
   
 /// MachineOperand class - Representation of each machine instruction operand.
 ///
@@ -117,6 +118,7 @@
   const MachineInstr *getParent() const { return ParentMI; }
   
   void print(std::ostream &os, const TargetMachine *TM = 0) const;
+  void print(raw_ostream &os, const TargetMachine *TM = 0) const;
 
   /// Accessors that tell you what kind of MachineOperand you're looking at.
   ///
@@ -425,6 +427,11 @@
   return OS;
 }
 
+inline raw_ostream &operator<<(raw_ostream &OS, const MachineOperand& MO) {
+  MO.print(OS, 0);
+  return OS;
+}
+
 } // End llvm namespace
 
 #endif
diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h
index 1694520..8019e44 100644
--- a/include/llvm/Support/raw_ostream.h
+++ b/include/llvm/Support/raw_ostream.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_SUPPORT_RAW_OSTREAM_H
 #define LLVM_SUPPORT_RAW_OSTREAM_H
 
+#include "llvm/ADT/StringExtras.h"
 #include <cassert>
 #include <cstring>
 #include <string>
@@ -72,7 +73,11 @@
     return write(Str, strlen(Str));
   }
   
-  raw_ostream &operator<<(unsigned N) {
+  raw_ostream &operator<<(const std::string& Str) {
+    return write(Str.data(), Str.length());
+  }
+  
+  raw_ostream &operator<<(uint64_t N) {
     // Zero is a special case.
     if (N == 0)
       return *this << '0';
@@ -88,6 +93,34 @@
     return write(CurPtr, EndPtr-CurPtr);
   }
   
+  raw_ostream &operator<<(int64_t N) {
+    if (N <  0) {
+      if (OutBufCur >= OutBufEnd)
+        flush_impl();
+      *OutBufCur++ = '-';
+      
+      N = -N;
+    }
+    
+    return this->operator<<(static_cast<uint64_t>(N));
+  }
+  
+  raw_ostream &operator<<(uint32_t N) {
+    return this->operator<<(static_cast<uint64_t>(N));
+  }
+  
+  raw_ostream &operator<<(int32_t N) {
+    return this->operator<<(static_cast<int64_t>(N));
+  }
+  
+  raw_ostream &operator<<(size_t N) {
+    return this->operator<<(static_cast<uint64_t>(N));
+  }
+  
+  raw_ostream &operator<<(double N) {
+    return this->operator<<(ftostr(N));
+  }
+  
   
   raw_ostream &write(const char *Ptr, unsigned Size) {
     if (OutBufCur+Size > OutBufEnd)
diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h
index e86af9f..93c46ae 100644
--- a/include/llvm/Target/TargetMachine.h
+++ b/include/llvm/Target/TargetMachine.h
@@ -35,6 +35,7 @@
 class Pass;
 class TargetMachOWriterInfo;
 class TargetELFWriterInfo;
+class raw_ostream;
 
 // Relocation model types.
 namespace Reloc {
@@ -196,7 +197,7 @@
   /// is not supported.
   ///
   virtual FileModel::Model addPassesToEmitFile(PassManagerBase &,
-                                               std::ostream &,
+                                               raw_ostream &,
                                                CodeGenFileType,
                                                bool /*Fast*/) {
     return FileModel::None;
@@ -227,7 +228,7 @@
   /// require having the entire module at once.  This is not recommended, do not
   /// use this.
   virtual bool WantsWholeFile() const { return false; }
-  virtual bool addPassesToEmitWholeFile(PassManager &, std::ostream &,
+  virtual bool addPassesToEmitWholeFile(PassManager &, raw_ostream &,
                                         CodeGenFileType, bool /*Fast*/) {
     return true;
   }
@@ -253,7 +254,7 @@
   /// target-specific passes in standard locations.
   ///
   virtual FileModel::Model addPassesToEmitFile(PassManagerBase &PM,
-                                               std::ostream &Out,
+                                               raw_ostream &Out,
                                                CodeGenFileType FileType,
                                                bool Fast);
   
@@ -309,7 +310,7 @@
   /// the asmprinter, if asm emission is supported.  If this is not supported,
   /// 'true' should be returned.
   virtual bool addAssemblyEmitter(PassManagerBase &, bool /*Fast*/, 
-                                  std::ostream &) {
+                                  raw_ostream &) {
     return true;
   }
   
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 2eccc36..bf57a65 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -21,7 +21,7 @@
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/Support/Mangler.h"
-#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Streams.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetData.h"
@@ -31,11 +31,12 @@
 #include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
 #include <cerrno>
 using namespace llvm;
 
 char AsmPrinter::ID = 0;
-AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
+AsmPrinter::AsmPrinter(raw_ostream &o, TargetMachine &tm,
                        const TargetAsmInfo *T)
   : MachineFunctionPass((intptr_t)&ID), FunctionNumber(0), O(o),
     TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
@@ -268,8 +269,9 @@
   EmitAlignment(Alignment);
   for (unsigned i = 0, e = CP.size(); i != e; ++i) {
     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
-      << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << ' ';
-    WriteTypeSymbolic(O, CP[i].first.getType(), 0);
+      << CP[i].second << ":\t\t\t\t\t";
+    // O << TAI->getCommentString() << ' ' << 
+    //      WriteTypeSymbolic(O, CP[i].first.getType(), 0);
     O << '\n';
     if (CP[i].first.isMachineConstantPoolEntry())
       EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
@@ -495,7 +497,7 @@
     unsigned Byte = Value & 0x7f;
     Value >>= 7;
     if (Value) Byte |= 0x80;
-    O << "0x" << std::hex << Byte << std::dec;
+    O << "0x" <<  utohexstr(Byte);
     if (Value) O << ", ";
   } while (Value);
 }
@@ -511,7 +513,7 @@
     Value >>= 7;
     IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
     if (IsMore) Byte |= 0x80;
-    O << "0x" << std::hex << Byte << std::dec;
+    O << "0x" << utohexstr(Byte);
     if (IsMore) O << ", ";
   } while (IsMore);
 }
@@ -523,7 +525,7 @@
 /// PrintHex - Print a value as a hexidecimal value.
 ///
 void AsmPrinter::PrintHex(int Value) const { 
-  O << "0x" << std::hex << Value << std::dec;
+  O << "0x" << utohexstr(static_cast<unsigned>(Value));
 }
 
 /// EOL - Print a newline character to asm stream.  If a comment is present
@@ -622,7 +624,7 @@
 
 /// printStringChar - Print a char, escaped if necessary.
 ///
-static void printStringChar(std::ostream &O, unsigned char C) {
+static void printStringChar(raw_ostream &O, char C) {
   if (C == '"') {
     O << "\\\"";
   } else if (C == '\\') {
@@ -706,7 +708,7 @@
 
   unsigned FillValue = TAI->getTextAlignFillValue();
   UseFillExpr &= IsInTextSection && FillValue;
-  if (UseFillExpr) O << ",0x" << std::hex << FillValue << std::dec;
+  if (UseFillExpr) O << ",0x" << utohexstr(FillValue);
   O << '\n';
 }
 
@@ -855,7 +857,7 @@
 /// printAsCString - Print the specified array as a C compatible string, only if
 /// the predicate isString is true.
 ///
-static void printAsCString(std::ostream &O, const ConstantArray *CVA,
+static void printAsCString(raw_ostream &O, const ConstantArray *CVA,
                            unsigned LastElt) {
   assert(CVA->isString() && "Array is not string compatible!");
 
diff --git a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
index 5d6acc3..99e94e2 100644
--- a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
@@ -28,6 +28,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/System/Path.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetRegisterInfo.h"
@@ -820,7 +821,7 @@
   //
   /// O - Stream to .s file.
   ///
-  std::ostream &O;
+  raw_ostream &O;
 
   /// Asm - Target of Dwarf emission.
   ///
@@ -856,7 +857,7 @@
   const char * const Flavor;
 
   unsigned SetCounter;
-  Dwarf(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
+  Dwarf(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
         const char *flavor)
   : O(OS)
   , Asm(A)
@@ -2673,7 +2674,7 @@
   //===--------------------------------------------------------------------===//
   // Main entry points.
   //
-  DwarfDebug(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
+  DwarfDebug(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
   : Dwarf(OS, A, T, "dbg")
   , CompileUnits()
   , AbbreviationsSet(InitAbbreviationsSetSize)
@@ -3479,7 +3480,7 @@
   //===--------------------------------------------------------------------===//
   // Main entry points.
   //
-  DwarfException(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
+  DwarfException(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
   : Dwarf(OS, A, T, "eh")
   , shouldEmitTable(false)
   , shouldEmitMoves(false)
@@ -3879,7 +3880,7 @@
 /// DwarfWriter Implementation
 ///
 
-DwarfWriter::DwarfWriter(std::ostream &OS, AsmPrinter *A,
+DwarfWriter::DwarfWriter(raw_ostream &OS, AsmPrinter *A,
                          const TargetAsmInfo *T) {
   DE = new DwarfException(OS, A, T);
   DD = new DwarfDebug(OS, A, T);
diff --git a/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp b/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
index 761e910..16abca2 100644
--- a/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp
@@ -15,6 +15,7 @@
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/GCMetadataPrinter.h"
 #include "llvm/Module.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
@@ -25,10 +26,10 @@
 
   class VISIBILITY_HIDDEN OcamlGCMetadataPrinter : public GCMetadataPrinter {
   public:
-    void beginAssembly(std::ostream &OS, AsmPrinter &AP,
+    void beginAssembly(raw_ostream &OS, AsmPrinter &AP,
                        const TargetAsmInfo &TAI);
     
-    void finishAssembly(std::ostream &OS, AsmPrinter &AP,
+    void finishAssembly(raw_ostream &OS, AsmPrinter &AP,
                         const TargetAsmInfo &TAI);
   };
   
@@ -39,7 +40,7 @@
 
 void llvm::linkOcamlGCPrinter() { }
 
-static void EmitCamlGlobal(const Module &M, std::ostream &OS, AsmPrinter &AP,
+static void EmitCamlGlobal(const Module &M, raw_ostream &OS, AsmPrinter &AP,
                            const TargetAsmInfo &TAI, const char *Id) {
   const std::string &MId = M.getModuleIdentifier();
   
@@ -59,7 +60,7 @@
   OS << Mangled << ":\n";
 }
 
-void OcamlGCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
+void OcamlGCMetadataPrinter::beginAssembly(raw_ostream &OS, AsmPrinter &AP,
                                            const TargetAsmInfo &TAI) {
   AP.SwitchToTextSection(TAI.getTextSection());
   EmitCamlGlobal(getModule(), OS, AP, TAI, "code_begin");
@@ -84,7 +85,7 @@
 /// (FrameSize and LiveOffsets would overflow). FrameTablePrinter will abort if
 /// either condition is detected in a function which uses the GC.
 /// 
-void OcamlGCMetadataPrinter::finishAssembly(std::ostream &OS, AsmPrinter &AP,
+void OcamlGCMetadataPrinter::finishAssembly(raw_ostream &OS, AsmPrinter &AP,
                                             const TargetAsmInfo &TAI) {
   const char *AddressDirective;
   int AddressAlignLog;
diff --git a/lib/CodeGen/ELFWriter.cpp b/lib/CodeGen/ELFWriter.cpp
index 27f23f4..6f29112 100644
--- a/lib/CodeGen/ELFWriter.cpp
+++ b/lib/CodeGen/ELFWriter.cpp
@@ -44,6 +44,7 @@
 #include "llvm/Support/Mangler.h"
 #include "llvm/Support/OutputBuffer.h"
 #include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
 #include <list>
 using namespace llvm;
 
@@ -51,7 +52,7 @@
 /// AddELFWriter - Concrete function to add the ELF writer to the function pass
 /// manager.
 MachineCodeEmitter *llvm::AddELFWriter(PassManagerBase &PM,
-                                       std::ostream &O,
+                                       raw_ostream &O,
                                        TargetMachine &TM) {
   ELFWriter *EW = new ELFWriter(O, TM);
   PM.add(EW);
@@ -193,7 +194,7 @@
 //                          ELFWriter Implementation
 //===----------------------------------------------------------------------===//
 
-ELFWriter::ELFWriter(std::ostream &o, TargetMachine &tm) 
+ELFWriter::ELFWriter(raw_ostream &o, TargetMachine &tm) 
   : MachineFunctionPass((intptr_t)&ID), O(o), TM(tm) {
   e_flags = 0;    // e_flags defaults to 0, no flags.
 
@@ -536,7 +537,7 @@
     if (S.Align)
       for (size_t NewFileOff = (FileOff+S.Align-1) & ~(S.Align-1);
            FileOff != NewFileOff; ++FileOff)
-        O.put((char)0xAB);
+        O << (char)0xAB;
     O.write((char*)&S.SectionData[0], S.SectionData.size());
     FileOff += S.SectionData.size();
 
@@ -557,7 +558,7 @@
   // Align output for the section table.
   for (size_t NewFileOff = (FileOff+TableAlign-1) & ~(TableAlign-1);
        FileOff != NewFileOff; ++FileOff)
-    O.put((char)0xAB);
+    O << (char)0xAB;
 
   // Emit the section table itself.
   O.write((char*)&Table[0], Table.size());
diff --git a/lib/CodeGen/ELFWriter.h b/lib/CodeGen/ELFWriter.h
index be3b39b..31aa05a 100644
--- a/lib/CodeGen/ELFWriter.h
+++ b/lib/CodeGen/ELFWriter.h
@@ -23,6 +23,7 @@
   class Mangler;
   class MachineCodeEmitter;
   class ELFCodeEmitter;
+  class raw_ostream;
 
   /// ELFWriter - This class implements the common target-independent code for
   /// writing ELF files.  Targets should derive a class from this to
@@ -37,7 +38,7 @@
       return *(MachineCodeEmitter*)MCE;
     }
 
-    ELFWriter(std::ostream &O, TargetMachine &TM);
+    ELFWriter(raw_ostream &O, TargetMachine &TM);
     ~ELFWriter();
 
     typedef std::vector<unsigned char> DataBuffer;
@@ -45,7 +46,7 @@
   protected:
     /// Output stream to send the resultant object file to.
     ///
-    std::ostream &O;
+    raw_ostream &O;
 
     /// Target machine description.
     ///
diff --git a/lib/CodeGen/GCMetadataPrinter.cpp b/lib/CodeGen/GCMetadataPrinter.cpp
index 4964503..5a5ef84 100644
--- a/lib/CodeGen/GCMetadataPrinter.cpp
+++ b/lib/CodeGen/GCMetadataPrinter.cpp
@@ -19,12 +19,12 @@
 
 GCMetadataPrinter::~GCMetadataPrinter() { }
 
-void GCMetadataPrinter::beginAssembly(std::ostream &OS, AsmPrinter &AP,
+void GCMetadataPrinter::beginAssembly(raw_ostream &OS, AsmPrinter &AP,
                                       const TargetAsmInfo &TAI) {
   // Default is no action.
 }
 
-void GCMetadataPrinter::finishAssembly(std::ostream &OS, AsmPrinter &AP,
+void GCMetadataPrinter::finishAssembly(raw_ostream &OS, AsmPrinter &AP,
                                        const TargetAsmInfo &TAI) {
   // Default is no action.
 }
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 938e1ae..fb918f3 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -22,6 +22,7 @@
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden,
@@ -50,7 +51,7 @@
 
 FileModel::Model
 LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
-                                       std::ostream &Out,
+                                       raw_ostream &Out,
                                        CodeGenFileType FileType,
                                        bool Fast) {
   // Standard LLVM-Level Passes.
diff --git a/lib/CodeGen/MachOWriter.cpp b/lib/CodeGen/MachOWriter.cpp
index bed2c5c..9f1cb00 100644
--- a/lib/CodeGen/MachOWriter.cpp
+++ b/lib/CodeGen/MachOWriter.cpp
@@ -37,6 +37,7 @@
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/OutputBuffer.h"
 #include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cstring>
 using namespace llvm;
@@ -44,7 +45,7 @@
 /// AddMachOWriter - Concrete function to add the Mach-O writer to the function
 /// pass manager.
 MachineCodeEmitter *llvm::AddMachOWriter(PassManagerBase &PM,
-                                         std::ostream &O,
+                                         raw_ostream &O,
                                          TargetMachine &TM) {
   MachOWriter *MOW = new MachOWriter(O, TM);
   PM.add(MOW);
@@ -334,7 +335,7 @@
 //===----------------------------------------------------------------------===//
 
 char MachOWriter::ID = 0;
-MachOWriter::MachOWriter(std::ostream &o, TargetMachine &tm) 
+MachOWriter::MachOWriter(raw_ostream &o, TargetMachine &tm) 
   : MachineFunctionPass((intptr_t)&ID), O(o), TM(tm) {
   is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
   isLittleEndian = TM.getTargetData()->isLittleEndian();
diff --git a/lib/CodeGen/MachOWriter.h b/lib/CodeGen/MachOWriter.h
index 44fa7d4..e2b6fa8 100644
--- a/lib/CodeGen/MachOWriter.h
+++ b/lib/CodeGen/MachOWriter.h
@@ -29,6 +29,7 @@
   class MachineCodeEmitter;
   class MachOCodeEmitter;
   class OutputBuffer;
+  class raw_ostream;
 
   /// MachOSym - This struct contains information about each symbol that is
   /// added to logical symbol table for the module.  This is eventually
@@ -90,7 +91,7 @@
       return *(MachineCodeEmitter*)MCE;
     }
 
-    MachOWriter(std::ostream &O, TargetMachine &TM);
+    MachOWriter(raw_ostream &O, TargetMachine &TM);
     virtual ~MachOWriter();
 
     virtual const char *getPassName() const {
@@ -101,7 +102,7 @@
   protected:
     /// Output stream to send the resultant object file to.
     ///
-    std::ostream &O;
+    raw_ostream &O;
 
     /// Target machine description.
     ///
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 144b90f..39686cb 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -19,15 +19,15 @@
 
 #if defined(_MSC_VER)
 #include <io.h>
-#ifndef STDIN_FILENO
-# define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-# define STDOUT_FILENO 1
-#endif
-#ifndef STDERR_FILENO
-# define STDERR_FILENO 2
-#endif
+#ifndef STDIN_FILENO
+# define STDIN_FILENO 0
+#endif
+#ifndef STDOUT_FILENO
+# define STDOUT_FILENO 1
+#endif
+#ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+#endif
 #endif
 
 // An out of line virtual method to provide a home for the class vtable.
@@ -82,14 +82,14 @@
 
 /// outs() - This returns a reference to a raw_ostream for standard output.
 /// Use it like: outs() << "foo" << "bar";
-raw_ostream &outs() {
+raw_ostream &llvm::outs() {
   static raw_stdout_ostream S;
   return S;
 }
 
 /// errs() - This returns a reference to a raw_ostream for standard error.
 /// Use it like: errs() << "foo" << "bar";
-raw_ostream &errs() {
+raw_ostream &llvm::errs() {
   static raw_stderr_ostream S;
   return S;
 }
diff --git a/lib/Target/ARM/ARM.h b/lib/Target/ARM/ARM.h
index ef0c6bf..8050a3a 100644
--- a/lib/Target/ARM/ARM.h
+++ b/lib/Target/ARM/ARM.h
@@ -23,6 +23,7 @@
 class ARMTargetMachine;
 class FunctionPass;
 class MachineCodeEmitter;
+class raw_ostream;
 
 // Enums corresponding to ARM condition codes
 namespace ARMCC {
@@ -87,7 +88,7 @@
 }
 
 FunctionPass *createARMISelDag(ARMTargetMachine &TM);
-FunctionPass *createARMCodePrinterPass(std::ostream &O, ARMTargetMachine &TM);
+FunctionPass *createARMCodePrinterPass(raw_ostream &O, ARMTargetMachine &TM);
 FunctionPass *createARMCodeEmitterPass(ARMTargetMachine &TM,
                                        MachineCodeEmitter &MCE);
 FunctionPass *createARMLoadStoreOptimizationPass();
diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index 5b7018f..0613078 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -18,6 +18,7 @@
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachineRegistry.h"
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
@@ -143,7 +144,7 @@
 }
 
 bool ARMTargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast,
-                                          std::ostream &Out) {
+                                          raw_ostream &Out) {
   // Output assembly language.
   assert(AsmPrinterCtor && "AsmPrinter was not linked in");
   if (AsmPrinterCtor)
@@ -163,7 +164,7 @@
   if (DumpAsm) {
     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
     if (AsmPrinterCtor)
-      PM.add(AsmPrinterCtor(*cerr.stream(), *this));
+      PM.add(AsmPrinterCtor(errs(), *this));
   }
 
   return false;
@@ -176,7 +177,7 @@
   if (DumpAsm) {
     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
     if (AsmPrinterCtor)
-      PM.add(AsmPrinterCtor(*cerr.stream(), *this));
+      PM.add(AsmPrinterCtor(errs(), *this));
   }
 
   return false;
diff --git a/lib/Target/ARM/ARMTargetMachine.h b/lib/Target/ARM/ARMTargetMachine.h
index a485897..35f97e3 100644
--- a/lib/Target/ARM/ARMTargetMachine.h
+++ b/lib/Target/ARM/ARMTargetMachine.h
@@ -38,7 +38,7 @@
 protected:
   // To avoid having target depend on the asmprinter stuff libraries, asmprinter
   // set this functions to ctor pointer at startup time if they are linked in.
-  typedef FunctionPass *(*AsmPrinterCtorFn)(std::ostream &o,
+  typedef FunctionPass *(*AsmPrinterCtorFn)(raw_ostream &o,
                                             ARMTargetMachine &tm);
   static AsmPrinterCtorFn AsmPrinterCtor;
 
@@ -70,7 +70,7 @@
   virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
   virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast,
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, bool Fast,
                               bool DumpAsm, MachineCodeEmitter &MCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM, bool Fast,
diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index e7e8f27..3e617f9 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -35,6 +35,7 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
 #include <cctype>
 using namespace llvm;
 
@@ -42,7 +43,7 @@
 
 namespace {
   struct VISIBILITY_HIDDEN ARMAsmPrinter : public AsmPrinter {
-    ARMAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
+    ARMAsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T), DW(O, this, T), MMI(NULL), AFI(NULL), 
         InCPMode(false) {
       Subtarget = &TM.getSubtarget<ARMSubtarget>();
@@ -342,7 +343,7 @@
   }
 }
 
-static void printSOImm(std::ostream &O, int64_t V, const TargetAsmInfo *TAI) {
+static void printSOImm(raw_ostream &O, int64_t V, const TargetAsmInfo *TAI) {
   assert(V < (1 << 12) && "Not a valid so_imm value!");
   unsigned Imm = ARM_AM::getSOImmValImm(V);
   unsigned Rot = ARM_AM::getSOImmValRot(V);
@@ -824,7 +825,7 @@
 
 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
 /// Don't print things like \n or \0.
-static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
+static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
   for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
        Name != E; ++Name)
     if (isprint(*Name))
@@ -1030,7 +1031,7 @@
 /// using the given target machine description.  This should work
 /// regardless of whether the function is in SSA form.
 ///
-FunctionPass *llvm::createARMCodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createARMCodePrinterPass(raw_ostream &o,
                                              ARMTargetMachine &tm) {
   return new ARMAsmPrinter(o, tm, tm.getTargetAsmInfo());
 }
diff --git a/lib/Target/Alpha/Alpha.h b/lib/Target/Alpha/Alpha.h
index d69d1b7..f62270d 100644
--- a/lib/Target/Alpha/Alpha.h
+++ b/lib/Target/Alpha/Alpha.h
@@ -23,9 +23,10 @@
   class FunctionPass;
   class TargetMachine;
   class MachineCodeEmitter;
+  class raw_ostream;
 
   FunctionPass *createAlphaISelDag(AlphaTargetMachine &TM);
-  FunctionPass *createAlphaCodePrinterPass(std::ostream &OS,
+  FunctionPass *createAlphaCodePrinterPass(raw_ostream &OS,
                                              TargetMachine &TM);
   FunctionPass *createAlphaPatternInstructionSelector(TargetMachine &TM);
   FunctionPass *createAlphaCodeEmitterPass(AlphaTargetMachine &TM,
diff --git a/lib/Target/Alpha/AlphaAsmPrinter.cpp b/lib/Target/Alpha/AlphaAsmPrinter.cpp
index e592e80..d92317e 100644
--- a/lib/Target/Alpha/AlphaAsmPrinter.cpp
+++ b/lib/Target/Alpha/AlphaAsmPrinter.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/Statistic.h"
 using namespace llvm;
 
@@ -35,7 +36,7 @@
     /// Unique incrementer for label values for referencing Global values.
     ///
 
-    AlphaAsmPrinter(std::ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
+    AlphaAsmPrinter(raw_ostream &o, TargetMachine &tm, const TargetAsmInfo *T)
       : AsmPrinter(o, tm, T) {
     }
 
@@ -65,7 +66,7 @@
 /// using the given target machine description.  This should work
 /// regardless of whether the function is in SSA form.
 ///
-FunctionPass *llvm::createAlphaCodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createAlphaCodePrinterPass(raw_ostream &o,
                                                TargetMachine &tm) {
   return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo());
 }
diff --git a/lib/Target/Alpha/AlphaTargetMachine.cpp b/lib/Target/Alpha/AlphaTargetMachine.cpp
index e986a64..15c6948 100644
--- a/lib/Target/Alpha/AlphaTargetMachine.cpp
+++ b/lib/Target/Alpha/AlphaTargetMachine.cpp
@@ -17,6 +17,7 @@
 #include "llvm/Module.h"
 #include "llvm/PassManager.h"
 #include "llvm/Target/TargetMachineRegistry.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
@@ -78,7 +79,7 @@
   return false;
 }
 bool AlphaTargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                            std::ostream &Out) {
+                                            raw_ostream &Out) {
   PM.add(createAlphaLLRPPass(*this));
   PM.add(createAlphaCodePrinterPass(Out, *this));
   return false;
@@ -87,7 +88,7 @@
                                         bool DumpAsm, MachineCodeEmitter &MCE) {
   PM.add(createAlphaCodeEmitterPass(*this, MCE));
   if (DumpAsm)
-    PM.add(createAlphaCodePrinterPass(*cerr.stream(), *this));
+    PM.add(createAlphaCodePrinterPass(errs(), *this));
   return false;
 }
 bool AlphaTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
diff --git a/lib/Target/Alpha/AlphaTargetMachine.h b/lib/Target/Alpha/AlphaTargetMachine.h
index eab34c2..ff1e1d1 100644
--- a/lib/Target/Alpha/AlphaTargetMachine.h
+++ b/lib/Target/Alpha/AlphaTargetMachine.h
@@ -61,7 +61,7 @@
   virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
   virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, bool Fast,
                               bool DumpAsm, MachineCodeEmitter &MCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM, bool Fast,
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 2661b1b..f3de190 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -39,6 +39,7 @@
 #include "llvm/Support/InstVisitor.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/MathExtras.h"
@@ -76,7 +77,7 @@
   /// CWriter - This class is the main chunk of code that converts an LLVM
   /// module to a C translation unit.
   class CWriter : public FunctionPass, public InstVisitor<CWriter> {
-    std::ostream &Out;
+    raw_ostream &Out;
     IntrinsicLowering *IL;
     Mangler *Mang;
     LoopInfo *LI;
@@ -90,7 +91,7 @@
 
   public:
     static char ID;
-    explicit CWriter(std::ostream &o)
+    explicit CWriter(raw_ostream &o)
       : FunctionPass((intptr_t)&ID), Out(o), IL(0), Mang(0), LI(0), 
         TheModule(0), TAsm(0), TD(0) {}
 
@@ -126,16 +127,24 @@
       return false;
     }
 
-    std::ostream &printType(std::ostream &Out, const Type *Ty, 
+    raw_ostream &printType(raw_ostream &Out, const Type *Ty, 
                             bool isSigned = false,
                             const std::string &VariableName = "",
                             bool IgnoreName = false,
                             const PAListPtr &PAL = PAListPtr());
-    std::ostream &printSimpleType(std::ostream &Out, const Type *Ty, 
+    std::ostream &printType(std::ostream &Out, const Type *Ty, 
+                           bool isSigned = false,
+                           const std::string &VariableName = "",
+                           bool IgnoreName = false,
+                           const PAListPtr &PAL = PAListPtr());
+    raw_ostream &printSimpleType(raw_ostream &Out, const Type *Ty, 
                                   bool isSigned, 
                                   const std::string &NameSoFar = "");
+    std::ostream &printSimpleType(std::ostream &Out, const Type *Ty, 
+                                 bool isSigned, 
+                                 const std::string &NameSoFar = "");
 
-    void printStructReturnPointerFunctionType(std::ostream &Out,
+    void printStructReturnPointerFunctionType(raw_ostream &Out,
                                               const PAListPtr &PAL,
                                               const PointerType *Ty);
 
@@ -398,7 +407,7 @@
 /// printStructReturnPointerFunctionType - This is like printType for a struct
 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
 /// print it as "Struct (*)(...)", for struct return functions.
-void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
+void CWriter::printStructReturnPointerFunctionType(raw_ostream &Out,
                                                    const PAListPtr &PAL,
                                                    const PointerType *TheTy) {
   const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
@@ -433,6 +442,51 @@
       /*isSigned=*/PAL.paramHasAttr(0, ParamAttr::SExt), tstr);
 }
 
+raw_ostream &
+CWriter::printSimpleType(raw_ostream &Out, const Type *Ty, bool isSigned,
+                         const std::string &NameSoFar) {
+  assert((Ty->isPrimitiveType() || Ty->isInteger() || isa<VectorType>(Ty)) && 
+         "Invalid type for printSimpleType");
+  switch (Ty->getTypeID()) {
+  case Type::VoidTyID:   return Out << "void " << NameSoFar;
+  case Type::IntegerTyID: {
+    unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
+    if (NumBits == 1) 
+      return Out << "bool " << NameSoFar;
+    else if (NumBits <= 8)
+      return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
+    else if (NumBits <= 16)
+      return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
+    else if (NumBits <= 32)
+      return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
+    else if (NumBits <= 64)
+      return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
+    else { 
+      assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
+      return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
+    }
+  }
+  case Type::FloatTyID:  return Out << "float "   << NameSoFar;
+  case Type::DoubleTyID: return Out << "double "  << NameSoFar;
+  // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
+  // present matches host 'long double'.
+  case Type::X86_FP80TyID:
+  case Type::PPC_FP128TyID:
+  case Type::FP128TyID:  return Out << "long double " << NameSoFar;
+      
+  case Type::VectorTyID: {
+    const VectorType *VTy = cast<VectorType>(Ty);
+    return printSimpleType(Out, VTy->getElementType(), isSigned,
+                     " __attribute__((vector_size(" +
+                     utostr(TD->getABITypeSize(VTy)) + " ))) " + NameSoFar);
+  }
+    
+  default:
+    cerr << "Unknown primitive type: " << *Ty << "\n";
+    abort();
+  }
+}
+
 std::ostream &
 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
                          const std::string &NameSoFar) {
@@ -481,6 +535,111 @@
 // Pass the Type* and the variable name and this prints out the variable
 // declaration.
 //
+raw_ostream &CWriter::printType(raw_ostream &Out, const Type *Ty,
+                                 bool isSigned, const std::string &NameSoFar,
+                                 bool IgnoreName, const PAListPtr &PAL) {
+  if (Ty->isPrimitiveType() || Ty->isInteger() || isa<VectorType>(Ty)) {
+    printSimpleType(Out, Ty, isSigned, NameSoFar);
+    return Out;
+  }
+
+  // Check to see if the type is named.
+  if (!IgnoreName || isa<OpaqueType>(Ty)) {
+    std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
+    if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
+  }
+
+  switch (Ty->getTypeID()) {
+  case Type::FunctionTyID: {
+    const FunctionType *FTy = cast<FunctionType>(Ty);
+    std::stringstream FunctionInnards;
+    FunctionInnards << " (" << NameSoFar << ") (";
+    unsigned Idx = 1;
+    for (FunctionType::param_iterator I = FTy->param_begin(),
+           E = FTy->param_end(); I != E; ++I) {
+      const Type *ArgTy = *I;
+      if (PAL.paramHasAttr(Idx, ParamAttr::ByVal)) {
+        assert(isa<PointerType>(ArgTy));
+        ArgTy = cast<PointerType>(ArgTy)->getElementType();
+      }
+      if (I != FTy->param_begin())
+        FunctionInnards << ", ";
+      printType(FunctionInnards, ArgTy,
+        /*isSigned=*/PAL.paramHasAttr(Idx, ParamAttr::SExt), "");
+      ++Idx;
+    }
+    if (FTy->isVarArg()) {
+      if (FTy->getNumParams())
+        FunctionInnards << ", ...";
+    } else if (!FTy->getNumParams()) {
+      FunctionInnards << "void";
+    }
+    FunctionInnards << ')';
+    std::string tstr = FunctionInnards.str();
+    printType(Out, FTy->getReturnType(), 
+      /*isSigned=*/PAL.paramHasAttr(0, ParamAttr::SExt), tstr);
+    return Out;
+  }
+  case Type::StructTyID: {
+    const StructType *STy = cast<StructType>(Ty);
+    Out << NameSoFar + " {\n";
+    unsigned Idx = 0;
+    for (StructType::element_iterator I = STy->element_begin(),
+           E = STy->element_end(); I != E; ++I) {
+      Out << "  ";
+      printType(Out, *I, false, "field" + utostr(Idx++));
+      Out << ";\n";
+    }
+    Out << '}';
+    if (STy->isPacked())
+      Out << " __attribute__ ((packed))";
+    return Out;
+  }
+
+  case Type::PointerTyID: {
+    const PointerType *PTy = cast<PointerType>(Ty);
+    std::string ptrName = "*" + NameSoFar;
+
+    if (isa<ArrayType>(PTy->getElementType()) ||
+        isa<VectorType>(PTy->getElementType()))
+      ptrName = "(" + ptrName + ")";
+
+    if (!PAL.isEmpty())
+      // Must be a function ptr cast!
+      return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
+    return printType(Out, PTy->getElementType(), false, ptrName);
+  }
+
+  case Type::ArrayTyID: {
+    const ArrayType *ATy = cast<ArrayType>(Ty);
+    unsigned NumElements = ATy->getNumElements();
+    if (NumElements == 0) NumElements = 1;
+    // Arrays are wrapped in structs to allow them to have normal
+    // value semantics (avoiding the array "decay").
+    Out << NameSoFar << " { ";
+    printType(Out, ATy->getElementType(), false,
+              "array[" + utostr(NumElements) + "]");
+    return Out << "; }";
+  }
+
+  case Type::OpaqueTyID: {
+    static int Count = 0;
+    std::string TyName = "struct opaque_" + itostr(Count++);
+    assert(TypeNames.find(Ty) == TypeNames.end());
+    TypeNames[Ty] = TyName;
+    return Out << TyName << ' ' << NameSoFar;
+  }
+  default:
+    assert(0 && "Unhandled case in getTypeProps!");
+    abort();
+  }
+
+  return Out;
+}
+
+// Pass the Type* and the variable name and this prints out the variable
+// declaration.
+//
 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
                                  bool isSigned, const std::string &NameSoFar,
                                  bool IgnoreName, const PAListPtr &PAL) {
@@ -1427,7 +1586,7 @@
 // generateCompilerSpecificCode - This is where we add conditional compilation
 // directives to cater to specific compilers as need be.
 //
-static void generateCompilerSpecificCode(std::ostream& Out,
+static void generateCompilerSpecificCode(raw_ostream& Out,
                                          const TargetData *TD) {
   // Alloca is hard to get, and we don't want to include stdlib.h here.
   Out << "/* get a declaration for alloca */\n"
@@ -1871,31 +2030,31 @@
           double Val = FPC->getValueAPF().convertToDouble();
           uint64_t i = FPC->getValueAPF().convertToAPInt().getZExtValue();
           Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
-              << " = 0x" << std::hex << i << std::dec
+              << " = 0x" << utohexstr(i)
               << "ULL;    /* " << Val << " */\n";
         } else if (FPC->getType() == Type::FloatTy) {
           float Val = FPC->getValueAPF().convertToFloat();
           uint32_t i = (uint32_t)FPC->getValueAPF().convertToAPInt().
                                     getZExtValue();
           Out << "static const ConstantFloatTy FPConstant" << FPCounter++
-              << " = 0x" << std::hex << i << std::dec
+              << " = 0x" << utohexstr(i)
               << "U;    /* " << Val << " */\n";
         } else if (FPC->getType() == Type::X86_FP80Ty) {
           // api needed to prevent premature destruction
           APInt api = FPC->getValueAPF().convertToAPInt();
           const uint64_t *p = api.getRawData();
           Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
-              << " = { 0x" << std::hex
-              << ((uint16_t)p[1] | (p[0] & 0xffffffffffffLL)<<16)
-              << "ULL, 0x" << (uint16_t)(p[0] >> 48) << ",{0,0,0}"
-              << "}; /* Long double constant */\n" << std::dec;
+              << " = { 0x"
+              << utohexstr((uint16_t)p[1] | (p[0] & 0xffffffffffffLL)<<16)
+              << "ULL, 0x" << utohexstr((uint16_t)(p[0] >> 48)) << ",{0,0,0}"
+              << "}; /* Long double constant */\n";
         } else if (FPC->getType() == Type::PPC_FP128Ty) {
           APInt api = FPC->getValueAPF().convertToAPInt();
           const uint64_t *p = api.getRawData();
           Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
-              << " = { 0x" << std::hex
-              << p[0] << ", 0x" << p[1]
-              << "}; /* Long double constant */\n" << std::dec;
+              << " = { 0x"
+              << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
+              << "}; /* Long double constant */\n";
 
         } else
           assert(0 && "Unknown float type!");
@@ -2869,11 +3028,16 @@
   case Intrinsic::dbg_stoppoint: {
     // If we use writeOperand directly we get a "u" suffix which is rejected
     // by gcc.
+    std::stringstream SPIStr;
     DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
+    SPI.getDirectory()->print(SPIStr);
     Out << "\n#line "
         << SPI.getLine()
-        << " \"" << SPI.getDirectory()
-        << SPI.getFileName() << "\"\n";
+        << " \"";
+    Out << SPIStr.str();
+    SPIStr.clear();
+    SPI.getFileName()->print(SPIStr);
+    Out << SPIStr.str() << "\"\n";
     return true;
   }
   case Intrinsic::x86_sse_cmp_ss:
@@ -3375,7 +3539,7 @@
 //===----------------------------------------------------------------------===//
 
 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
-                                              std::ostream &o,
+                                              raw_ostream &o,
                                               CodeGenFileType FileType,
                                               bool Fast) {
   if (FileType != TargetMachine::AssemblyFile) return true;
diff --git a/lib/Target/CBackend/CTargetMachine.h b/lib/Target/CBackend/CTargetMachine.h
index 7b5775a..ad89960 100644
--- a/lib/Target/CBackend/CTargetMachine.h
+++ b/lib/Target/CBackend/CTargetMachine.h
@@ -26,7 +26,7 @@
     : DataLayout(&M) {}
 
   virtual bool WantsWholeFile() const { return true; }
-  virtual bool addPassesToEmitWholeFile(PassManager &PM, std::ostream &Out,
+  virtual bool addPassesToEmitWholeFile(PassManager &PM, raw_ostream &Out,
                                         CodeGenFileType FileType, bool Fast);
 
   // This class always works, but shouldn't be the default in most cases.
diff --git a/lib/Target/CellSPU/SPU.h b/lib/Target/CellSPU/SPU.h
index 9fbf524..2d765b6 100644
--- a/lib/Target/CellSPU/SPU.h
+++ b/lib/Target/CellSPU/SPU.h
@@ -20,9 +20,10 @@
 namespace llvm {
   class SPUTargetMachine;
   class FunctionPass;
+  class raw_ostream;
 
   FunctionPass *createSPUISelDag(SPUTargetMachine &TM);
-  FunctionPass *createSPUAsmPrinterPass(std::ostream &o, SPUTargetMachine &tm);
+  FunctionPass *createSPUAsmPrinterPass(raw_ostream &o, SPUTargetMachine &tm);
 
   /*--== Utility functions/predicates/etc used all over the place: --==*/
   //! Predicate test for a signed 10-bit value
diff --git a/lib/Target/CellSPU/SPUAsmPrinter.cpp b/lib/Target/CellSPU/SPUAsmPrinter.cpp
index 817b746..a7db816 100644
--- a/lib/Target/CellSPU/SPUAsmPrinter.cpp
+++ b/lib/Target/CellSPU/SPUAsmPrinter.cpp
@@ -30,6 +30,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/Target/TargetInstrInfo.h"
@@ -47,7 +48,7 @@
   struct VISIBILITY_HIDDEN SPUAsmPrinter : public AsmPrinter {
     std::set<std::string> FnStubs, GVStubs;
 
-    SPUAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T) :
+    SPUAsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T) :
       AsmPrinter(O, TM, T)
     {
     }
@@ -275,7 +276,7 @@
     DwarfWriter DW;
     MachineModuleInfo *MMI;
 
-    LinuxAsmPrinter(std::ostream &O, SPUTargetMachine &TM,
+    LinuxAsmPrinter(raw_ostream &O, SPUTargetMachine &TM,
                     const TargetAsmInfo *T) :
       SPUAsmPrinter(O, TM, T),
       DW(O, this, T),
@@ -651,7 +652,7 @@
 /// assembly code for a MachineFunction to the given output stream, in a format
 /// that the Linux SPU assembler can deal with.
 ///
-FunctionPass *llvm::createSPUAsmPrinterPass(std::ostream &o,
+FunctionPass *llvm::createSPUAsmPrinterPass(raw_ostream &o,
                                             SPUTargetMachine &tm) {
   return new LinuxAsmPrinter(o, tm, tm.getTargetAsmInfo());
 }
diff --git a/lib/Target/CellSPU/SPUTargetMachine.cpp b/lib/Target/CellSPU/SPUTargetMachine.cpp
index 3019b55..f0512f3 100644
--- a/lib/Target/CellSPU/SPUTargetMachine.cpp
+++ b/lib/Target/CellSPU/SPUTargetMachine.cpp
@@ -79,7 +79,7 @@
 }
 
 bool SPUTargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                          std::ostream &Out) {
+                                          raw_ostream &Out) {
   PM.add(createSPUAsmPrinterPass(Out, *this));
   return false;
 }
diff --git a/lib/Target/CellSPU/SPUTargetMachine.h b/lib/Target/CellSPU/SPUTargetMachine.h
index 78fb547..fa72a0a 100644
--- a/lib/Target/CellSPU/SPUTargetMachine.h
+++ b/lib/Target/CellSPU/SPUTargetMachine.h
@@ -85,7 +85,7 @@
   // Pass Pipeline Configuration
   virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
 };
 
 } // end namespace llvm
diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index fc5be98..33326e1 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -29,6 +29,7 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Config/config.h"
 #include <algorithm>
 #include <set>
@@ -86,7 +87,7 @@
   /// module to a C++ translation unit.
   class CppWriter : public ModulePass {
     const char* progname;
-    std::ostream &Out;
+    raw_ostream &Out;
     const Module *TheModule;
     uint64_t uniqueNum;
     TypeMap TypeNames;
@@ -101,7 +102,7 @@
 
   public:
     static char ID;
-    explicit CppWriter(std::ostream &o) :
+    explicit CppWriter(raw_ostream &o) :
       ModulePass((intptr_t)&ID), Out(o), uniqueNum(0), is_inline(false) {}
 
     virtual const char *getPassName() const { return "C++ backend"; }
@@ -154,7 +155,7 @@
   };
 
   static unsigned indent_level = 0;
-  inline std::ostream& nl(std::ostream& Out, int delta = 0) {
+  inline raw_ostream& nl(raw_ostream& Out, int delta = 0) {
     Out << "\n";
     if (delta >= 0 || indent_level >= unsigned(-delta))
       indent_level += delta;
@@ -252,13 +253,13 @@
         else
           Out << StrVal << "f";
       } else if (CFP->getType() == Type::DoubleTy)
-        Out << "BitsToDouble(0x" << std::hex
-            << CFP->getValueAPF().convertToAPInt().getZExtValue()
-            << std::dec << "ULL) /* " << StrVal << " */";
+        Out << "BitsToDouble(0x"
+            << utohexstr(CFP->getValueAPF().convertToAPInt().getZExtValue())
+            << "ULL) /* " << StrVal << " */";
       else
-        Out << "BitsToFloat(0x" << std::hex
-            << (uint32_t)CFP->getValueAPF().convertToAPInt().getZExtValue()
-            << std::dec << "U) /* " << StrVal << " */";
+        Out << "BitsToFloat(0x"
+      << utohexstr((uint32_t)CFP->getValueAPF().convertToAPInt().getZExtValue())
+            << "U) /* " << StrVal << " */";
       Out << ")";
 #if HAVE_PRINTF_A
     }
@@ -1982,7 +1983,7 @@
 //===----------------------------------------------------------------------===//
 
 bool CPPTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
-                                                std::ostream &o,
+                                                raw_ostream &o,
                                                 CodeGenFileType FileType,
                                                 bool Fast) {
   if (FileType != TargetMachine::AssemblyFile) return true;
diff --git a/lib/Target/CppBackend/CPPTargetMachine.h b/lib/Target/CppBackend/CPPTargetMachine.h
index 4170cdf..db17c17 100644
--- a/lib/Target/CppBackend/CPPTargetMachine.h
+++ b/lib/Target/CppBackend/CPPTargetMachine.h
@@ -19,6 +19,8 @@
 
 namespace llvm {
 
+class raw_ostream;
+
 struct CPPTargetMachine : public TargetMachine {
   const TargetData DataLayout;       // Calculates type size & alignment
 
@@ -26,7 +28,7 @@
     : DataLayout(&M) {}
 
   virtual bool WantsWholeFile() const { return true; }
-  virtual bool addPassesToEmitWholeFile(PassManager &PM, std::ostream &Out,
+  virtual bool addPassesToEmitWholeFile(PassManager &PM, raw_ostream &Out,
                                         CodeGenFileType FileType, bool Fast);
 
   // This class always works, but shouldn't be the default in most cases.
diff --git a/lib/Target/IA64/IA64.h b/lib/Target/IA64/IA64.h
index b65af77..1fe1488 100644
--- a/lib/Target/IA64/IA64.h
+++ b/lib/Target/IA64/IA64.h
@@ -20,6 +20,7 @@
 
 class IA64TargetMachine;
 class FunctionPass;
+class raw_ostream;
 
 /// createIA64DAGToDAGInstructionSelector - This pass converts an LLVM
 /// function into IA64 machine code in a sane, DAG->DAG transform.
@@ -36,7 +37,7 @@
 /// using the given target machine description.  This should work
 /// regardless of whether the function is in SSA form.
 ///
-FunctionPass *createIA64CodePrinterPass(std::ostream &o, IA64TargetMachine &tm);
+FunctionPass *createIA64CodePrinterPass(raw_ostream &o, IA64TargetMachine &tm);
 
 } // End llvm namespace
 
diff --git a/lib/Target/IA64/IA64AsmPrinter.cpp b/lib/Target/IA64/IA64AsmPrinter.cpp
index 6ce530d..957deba 100644
--- a/lib/Target/IA64/IA64AsmPrinter.cpp
+++ b/lib/Target/IA64/IA64AsmPrinter.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Support/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/Statistic.h"
 using namespace llvm;
 
@@ -35,7 +36,7 @@
   struct IA64AsmPrinter : public AsmPrinter {
     std::set<std::string> ExternalFunctionNames, ExternalObjectNames;
 
-    IA64AsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
+    IA64AsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T) {
     }
 
@@ -336,7 +337,7 @@
     O << "\t.size " << name << ',' << Size << '\n';
   }
 
-  O << name << ":\t\t\t\t// " << *C << '\n';
+  O << name << ":\n";
   EmitGlobalConstant(C);
 }
 
@@ -370,7 +371,7 @@
 /// assembly code for a MachineFunction to the given output stream, using
 /// the given target machine description.
 ///
-FunctionPass *llvm::createIA64CodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createIA64CodePrinterPass(raw_ostream &o,
                                               IA64TargetMachine &tm) {
   return new IA64AsmPrinter(o, tm, tm.getTargetAsmInfo());
 }
diff --git a/lib/Target/IA64/IA64TargetMachine.cpp b/lib/Target/IA64/IA64TargetMachine.cpp
index 7a0e456..c789a86 100644
--- a/lib/Target/IA64/IA64TargetMachine.cpp
+++ b/lib/Target/IA64/IA64TargetMachine.cpp
@@ -82,7 +82,7 @@
   return true;
 }
 bool IA64TargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                           std::ostream &Out) {
+                                           raw_ostream &Out) {
   PM.add(createIA64CodePrinterPass(Out, *this));
   return false;
 }
diff --git a/lib/Target/IA64/IA64TargetMachine.h b/lib/Target/IA64/IA64TargetMachine.h
index cbcbb0f..18467a4 100644
--- a/lib/Target/IA64/IA64TargetMachine.h
+++ b/lib/Target/IA64/IA64TargetMachine.h
@@ -51,7 +51,7 @@
   virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
   virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
 };
 } // End llvm namespace
 
diff --git a/lib/Target/MSIL/MSILWriter.cpp b/lib/Target/MSIL/MSILWriter.cpp
index 99c1e9f..35eec84 100644
--- a/lib/Target/MSIL/MSILWriter.cpp
+++ b/lib/Target/MSIL/MSILWriter.cpp
@@ -35,7 +35,7 @@
       : DataLayout(&M) {}
 
     virtual bool WantsWholeFile() const { return true; }
-    virtual bool addPassesToEmitWholeFile(PassManager &PM, std::ostream &Out,
+    virtual bool addPassesToEmitWholeFile(PassManager &PM, raw_ostream &Out,
                                          CodeGenFileType FileType, bool Fast);
 
     // This class always works, but shouldn't be the default in most cases.
@@ -1191,7 +1191,7 @@
   for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
     const Instruction* Inst = I;
     // Comment llvm original instruction
-    Out << "\n//" << *Inst << "\n";
+    // Out << "\n//" << *Inst << "\n";
     // Do not handle PHI instruction in current block
     if (Inst->getOpcode()==Instruction::PHI) continue;
     // Print instruction
@@ -1367,8 +1367,8 @@
     for (std::vector<StaticInitializer>::const_iterator I = InitList.begin(),
          E = InitList.end(); I!=E; ++I) {
       if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(I->constant)) {
-        Out << "\n// Init " << getValueName(VarI->first) << ", offset " <<
-          utostr(I->offset) << ", type "<< *I->constant->getType() << "\n\n";
+        // Out << "\n// Init " << getValueName(VarI->first) << ", offset " <<
+        //  utostr(I->offset) << ", type "<< *I->constant->getType() << "\n\n";
         // Load variable address
         printValueLoad(VarI->first);
         // Add offset
@@ -1648,7 +1648,7 @@
 //                      External Interface declaration
 //===----------------------------------------------------------------------===//
 
-bool MSILTarget::addPassesToEmitWholeFile(PassManager &PM, std::ostream &o,
+bool MSILTarget::addPassesToEmitWholeFile(PassManager &PM, raw_ostream &o,
                                           CodeGenFileType FileType, bool Fast)
 {
   if (FileType != TargetMachine::AssemblyFile) return true;
diff --git a/lib/Target/MSIL/MSILWriter.h b/lib/Target/MSIL/MSILWriter.h
index 3ab6cd5..b141e23 100644
--- a/lib/Target/MSIL/MSILWriter.h
+++ b/lib/Target/MSIL/MSILWriter.h
@@ -22,6 +22,7 @@
 #include "llvm/Analysis/FindUsedTypes.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Support/GetElementPtrTypeIterator.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetMachineRegistry.h"
@@ -75,7 +76,7 @@
     }
 
   public:
-    std::ostream &Out;
+    raw_ostream &Out;
     Module* ModulePtr;
     const TargetData* TD;
     Mangler* Mang;
@@ -85,7 +86,7 @@
       StaticInitList;
     const std::set<const Type *>* UsedTypes;
     static char ID;
-    MSILWriter(std::ostream &o) : FunctionPass((intptr_t)&ID), Out(o) {
+    MSILWriter(raw_ostream &o) : FunctionPass((intptr_t)&ID), Out(o) {
       UniqID = 0;
     }
 
diff --git a/lib/Target/Mips/Mips.h b/lib/Target/Mips/Mips.h
index 0387c6a..1dc53ca 100644
--- a/lib/Target/Mips/Mips.h
+++ b/lib/Target/Mips/Mips.h
@@ -21,10 +21,11 @@
   class MipsTargetMachine;
   class FunctionPass;
   class MachineCodeEmitter;
+  class raw_ostream;
 
   FunctionPass *createMipsISelDag(MipsTargetMachine &TM);
   FunctionPass *createMipsDelaySlotFillerPass(MipsTargetMachine &TM);
-  FunctionPass *createMipsCodePrinterPass(std::ostream &OS, 
+  FunctionPass *createMipsCodePrinterPass(raw_ostream &OS, 
                                           MipsTargetMachine &TM);
 } // end namespace llvm;
 
diff --git a/lib/Target/Mips/MipsAsmPrinter.cpp b/lib/Target/Mips/MipsAsmPrinter.cpp
index 6d502ac..02455cf 100644
--- a/lib/Target/Mips/MipsAsmPrinter.cpp
+++ b/lib/Target/Mips/MipsAsmPrinter.cpp
@@ -37,6 +37,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
 #include <cctype>
 
 using namespace llvm;
@@ -48,7 +49,7 @@
 
     const MipsSubtarget *Subtarget;
 
-    MipsAsmPrinter(std::ostream &O, MipsTargetMachine &TM, 
+    MipsAsmPrinter(raw_ostream &O, MipsTargetMachine &TM, 
                    const TargetAsmInfo *T): 
                    AsmPrinter(O, TM, T) {
       Subtarget = &TM.getSubtarget<MipsSubtarget>();
@@ -89,7 +90,7 @@
 /// assembly code for a MachineFunction to the given output stream,
 /// using the given target machine description.  This should work
 /// regardless of whether the function is in SSA form.
-FunctionPass *llvm::createMipsCodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createMipsCodePrinterPass(raw_ostream &o,
                                               MipsTargetMachine &tm) 
 {
   return new MipsAsmPrinter(o, tm, tm.getTargetAsmInfo());
@@ -175,10 +176,9 @@
 void MipsAsmPrinter::
 printHex32(unsigned int Value) 
 {
-  O << "0x" << std::hex;
+  O << "0x";
   for (int i = 7; i >= 0; i--) 
-    O << std::hex << ( (Value & (0xF << (i*4))) >> (i*4) );
-  O << std::dec;
+    O << utohexstr( (Value & (0xF << (i*4))) >> (i*4) );
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/Mips/MipsTargetMachine.cpp b/lib/Target/Mips/MipsTargetMachine.cpp
index bc2f281..b24e498 100644
--- a/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/lib/Target/Mips/MipsTargetMachine.cpp
@@ -117,7 +117,7 @@
 // true if AssemblyEmitter is supported
 bool MipsTargetMachine::
 addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                   std::ostream &Out) 
+                   raw_ostream &Out) 
 {
   // Output assembly language.
   PM.add(createMipsCodePrinterPass(Out, *this));
diff --git a/lib/Target/Mips/MipsTargetMachine.h b/lib/Target/Mips/MipsTargetMachine.h
index bdca77f..ac55647 100644
--- a/lib/Target/Mips/MipsTargetMachine.h
+++ b/lib/Target/Mips/MipsTargetMachine.h
@@ -22,6 +22,8 @@
 #include "llvm/Target/TargetFrameInfo.h"
 
 namespace llvm {
+  class raw_ostream;
+  
   class MipsTargetMachine : public LLVMTargetMachine {
     MipsSubtarget       Subtarget;
     const TargetData    DataLayout; // Calculates type size & alignment
@@ -58,7 +60,7 @@
     virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
     virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
     virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                    std::ostream &Out);
+                                    raw_ostream &Out);
   };
 
 /// MipselTargetMachine - Mipsel target machine.
diff --git a/lib/Target/PIC16/PIC16.h b/lib/Target/PIC16/PIC16.h
index e83dbfd..6921bfd 100644
--- a/lib/Target/PIC16/PIC16.h
+++ b/lib/Target/PIC16/PIC16.h
@@ -22,9 +22,10 @@
   class FunctionPassManager;
   class FunctionPass;
   class MachineCodeEmitter;
+  class raw_ostream;
 
   FunctionPass *createPIC16ISelDag(PIC16TargetMachine &TM);
-  FunctionPass *createPIC16CodePrinterPass(std::ostream &OS, 
+  FunctionPass *createPIC16CodePrinterPass(raw_ostream &OS, 
                                            PIC16TargetMachine &TM);
 } // end namespace llvm;
 
diff --git a/lib/Target/PIC16/PIC16AsmPrinter.cpp b/lib/Target/PIC16/PIC16AsmPrinter.cpp
index c6b2ace..8c6dfbb 100644
--- a/lib/Target/PIC16/PIC16AsmPrinter.cpp
+++ b/lib/Target/PIC16/PIC16AsmPrinter.cpp
@@ -31,6 +31,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
@@ -43,7 +44,7 @@
 
 namespace {
   struct VISIBILITY_HIDDEN PIC16AsmPrinter : public AsmPrinter {
-    PIC16AsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
+    PIC16AsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T) {
     }
 
@@ -109,7 +110,7 @@
 /// using the given target machine description.  This should work
 /// regardless of whether the function is in SSA form.
 ///
-FunctionPass *llvm::createPIC16CodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
                                                PIC16TargetMachine &tm) {
   return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo());
 }
@@ -275,7 +276,7 @@
 }
 
 static void 
-printSOImm(std::ostream &O, int64_t V, const TargetAsmInfo *TAI) 
+printSOImm(raw_ostream &O, int64_t V, const TargetAsmInfo *TAI) 
 {
   assert(V < (1 << 12) && "Not a valid so_imm value!");
   
diff --git a/lib/Target/PIC16/PIC16TargetMachine.cpp b/lib/Target/PIC16/PIC16TargetMachine.cpp
index 7b3814b..26b573a 100644
--- a/lib/Target/PIC16/PIC16TargetMachine.cpp
+++ b/lib/Target/PIC16/PIC16TargetMachine.cpp
@@ -61,7 +61,7 @@
 }
 
 bool PIC16TargetMachine::
-addAssemblyEmitter(PassManagerBase &PM, bool Fast, std::ostream &Out) 
+addAssemblyEmitter(PassManagerBase &PM, bool Fast, raw_ostream &Out) 
 {
   // Output assembly language.
   PM.add(createPIC16CodePrinterPass(Out, *this));
diff --git a/lib/Target/PIC16/PIC16TargetMachine.h b/lib/Target/PIC16/PIC16TargetMachine.h
index 1a0727e..bf0642f 100644
--- a/lib/Target/PIC16/PIC16TargetMachine.h
+++ b/lib/Target/PIC16/PIC16TargetMachine.h
@@ -54,7 +54,7 @@
   virtual bool addPrologEpilogInserter(PassManagerBase &PM, bool Fast);
   virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
 };
 } // end namespace llvm
 
diff --git a/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp b/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
index c5ed305..8ea1825 100644
--- a/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/AsmPrinter/PPCAsmPrinter.cpp
@@ -36,6 +36,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/Target/TargetInstrInfo.h"
@@ -52,7 +53,7 @@
     std::set<std::string> FnStubs, GVStubs;
     const PPCSubtarget &Subtarget;
 
-    PPCAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
+    PPCAsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T), Subtarget(TM.getSubtarget<PPCSubtarget>()) {
     }
 
@@ -295,7 +296,7 @@
     DwarfWriter DW;
     MachineModuleInfo *MMI;
 
-    PPCLinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
+    PPCLinuxAsmPrinter(raw_ostream &O, PPCTargetMachine &TM,
                     const TargetAsmInfo *T)
       : PPCAsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
     }
@@ -327,7 +328,7 @@
     DwarfWriter DW;
     MachineModuleInfo *MMI;
 
-    PPCDarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
+    PPCDarwinAsmPrinter(raw_ostream &O, PPCTargetMachine &TM,
                         const TargetAsmInfo *T)
       : PPCAsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
     }
@@ -649,7 +650,7 @@
 
 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
 /// Don't print things like \n or \0.
-static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
+static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
   for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
        Name != E; ++Name)
     if (isprint(*Name))
@@ -1107,7 +1108,7 @@
 /// for a MachineFunction to the given output stream, in a format that the
 /// Darwin assembler can deal with.
 ///
-FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o,
+FunctionPass *llvm::createPPCAsmPrinterPass(raw_ostream &o,
                                             PPCTargetMachine &tm) {
   const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
 
diff --git a/lib/Target/PowerPC/PPC.h b/lib/Target/PowerPC/PPC.h
index b9f6483..9a8e22e 100644
--- a/lib/Target/PowerPC/PPC.h
+++ b/lib/Target/PowerPC/PPC.h
@@ -25,10 +25,11 @@
   class PPCTargetMachine;
   class FunctionPass;
   class MachineCodeEmitter;
+  class raw_ostream;
   
 FunctionPass *createPPCBranchSelectionPass();
 FunctionPass *createPPCISelDag(PPCTargetMachine &TM);
-FunctionPass *createPPCAsmPrinterPass(std::ostream &OS,
+FunctionPass *createPPCAsmPrinterPass(raw_ostream &OS,
                                       PPCTargetMachine &TM);
 FunctionPass *createPPCCodeEmitterPass(PPCTargetMachine &TM,
                                        MachineCodeEmitter &MCE);
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index 7857848..3d73751 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -18,6 +18,7 @@
 #include "llvm/PassManager.h"
 #include "llvm/Target/TargetMachineRegistry.h"
 #include "llvm/Target/TargetOptions.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 // Register the targets
@@ -134,7 +135,7 @@
 }
 
 bool PPCTargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                          std::ostream &Out) {
+                                          raw_ostream &Out) {
   assert(AsmPrinterCtor && "AsmPrinter was not linked in");
   if (AsmPrinterCtor)
     PM.add(AsmPrinterCtor(Out, *this));
@@ -167,7 +168,7 @@
   if (DumpAsm) {
     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
     if (AsmPrinterCtor)
-      PM.add(AsmPrinterCtor(*cerr.stream(), *this));
+      PM.add(AsmPrinterCtor(errs(), *this));
   }
 
   return false;
@@ -180,7 +181,7 @@
   if (DumpAsm) {
     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
     if (AsmPrinterCtor)
-      PM.add(AsmPrinterCtor(*cerr.stream(), *this));
+      PM.add(AsmPrinterCtor(errs(), *this));
   }
 
   return false;
diff --git a/lib/Target/PowerPC/PPCTargetMachine.h b/lib/Target/PowerPC/PPCTargetMachine.h
index 58fd55d..8d65fd2 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.h
+++ b/lib/Target/PowerPC/PPCTargetMachine.h
@@ -44,7 +44,7 @@
 
   // To avoid having target depend on the asmprinter stuff libraries, asmprinter
   // set this functions to ctor pointer at startup time if they are linked in.
-  typedef FunctionPass *(*AsmPrinterCtorFn)(std::ostream &o,
+  typedef FunctionPass *(*AsmPrinterCtorFn)(raw_ostream &o,
                                             PPCTargetMachine &tm);
   static AsmPrinterCtorFn AsmPrinterCtor;
 
@@ -78,7 +78,7 @@
   virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
   virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, bool Fast,
                               bool DumpAsm, MachineCodeEmitter &MCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM, bool Fast,
diff --git a/lib/Target/Sparc/Sparc.h b/lib/Target/Sparc/Sparc.h
index 2788bf6..4f02ab8 100644
--- a/lib/Target/Sparc/Sparc.h
+++ b/lib/Target/Sparc/Sparc.h
@@ -21,9 +21,10 @@
 namespace llvm {
   class FunctionPass;
   class TargetMachine;
+  class raw_ostream;
 
   FunctionPass *createSparcISelDag(TargetMachine &TM);
-  FunctionPass *createSparcCodePrinterPass(std::ostream &OS, TargetMachine &TM);
+  FunctionPass *createSparcCodePrinterPass(raw_ostream &OS, TargetMachine &TM);
   FunctionPass *createSparcDelaySlotFillerPass(TargetMachine &TM);
   FunctionPass *createSparcFPMoverPass(TargetMachine &TM);
 } // end namespace llvm;
diff --git a/lib/Target/Sparc/SparcAsmPrinter.cpp b/lib/Target/Sparc/SparcAsmPrinter.cpp
index 5cdb4d6..8fa5488 100644
--- a/lib/Target/Sparc/SparcAsmPrinter.cpp
+++ b/lib/Target/Sparc/SparcAsmPrinter.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Support/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/CommandLine.h"
@@ -39,7 +40,7 @@
 
 namespace {
   struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
-    SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
+    SparcAsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T) {
     }
 
@@ -75,7 +76,7 @@
 /// using the given target machine description.  This should work
 /// regardless of whether the function is in SSA form.
 ///
-FunctionPass *llvm::createSparcCodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createSparcCodePrinterPass(raw_ostream &o,
                                                TargetMachine &tm) {
   return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
 }
diff --git a/lib/Target/Sparc/SparcTargetMachine.cpp b/lib/Target/Sparc/SparcTargetMachine.cpp
index 9785669..e0ab42e 100644
--- a/lib/Target/Sparc/SparcTargetMachine.cpp
+++ b/lib/Target/Sparc/SparcTargetMachine.cpp
@@ -75,7 +75,7 @@
 }
 
 bool SparcTargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                            std::ostream &Out) {
+                                            raw_ostream &Out) {
   // Output assembly language.
   PM.add(createSparcCodePrinterPass(Out, *this));
   return false;
diff --git a/lib/Target/Sparc/SparcTargetMachine.h b/lib/Target/Sparc/SparcTargetMachine.h
index 1d1acd2..d7c3837 100644
--- a/lib/Target/Sparc/SparcTargetMachine.h
+++ b/lib/Target/Sparc/SparcTargetMachine.h
@@ -49,7 +49,7 @@
   virtual bool addInstSelector(PassManagerBase &PM, bool Fast);
   virtual bool addPreEmitPass(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
 };
 
 } // end namespace llvm
diff --git a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
index 575762e..d154aaf 100644
--- a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
@@ -28,6 +28,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/Support/Mangler.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetOptions.h"
 using namespace llvm;
@@ -84,7 +85,7 @@
 
 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
 /// Don't print things like \n or \0.
-static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
+static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
   for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
        Name != E; ++Name)
     if (isprint(*Name))
diff --git a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
index 235c72e..87845fb 100644
--- a/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
+++ b/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
@@ -34,7 +34,7 @@
 
   const X86Subtarget *Subtarget;
 
-  X86ATTAsmPrinter(std::ostream &O, X86TargetMachine &TM,
+  X86ATTAsmPrinter(raw_ostream &O, X86TargetMachine &TM,
                    const TargetAsmInfo *T)
     : AsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
     Subtarget = &TM.getSubtarget<X86Subtarget>();
diff --git a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
index 9b69264..ad4d12f 100644
--- a/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
+++ b/lib/Target/X86/AsmPrinter/X86AsmPrinter.cpp
@@ -23,7 +23,7 @@
 /// for a MachineFunction to the given output stream, using the given target
 /// machine description.
 ///
-FunctionPass *llvm::createX86CodePrinterPass(std::ostream &o,
+FunctionPass *llvm::createX86CodePrinterPass(raw_ostream &o,
                                              X86TargetMachine &tm) {
   const X86Subtarget *Subtarget = &tm.getSubtarget<X86Subtarget>();
 
diff --git a/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.h b/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.h
index faf26bd..3cb17fa 100644
--- a/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.h
+++ b/lib/Target/X86/AsmPrinter/X86IntelAsmPrinter.h
@@ -20,11 +20,12 @@
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
 
 namespace llvm {
 
 struct VISIBILITY_HIDDEN X86IntelAsmPrinter : public AsmPrinter {
-  X86IntelAsmPrinter(std::ostream &O, X86TargetMachine &TM,
+  X86IntelAsmPrinter(raw_ostream &O, X86TargetMachine &TM,
                      const TargetAsmInfo *T)
       : AsmPrinter(O, TM, T) {
   }
diff --git a/lib/Target/X86/X86.h b/lib/Target/X86/X86.h
index 2dd067a..a77542d 100644
--- a/lib/Target/X86/X86.h
+++ b/lib/Target/X86/X86.h
@@ -22,6 +22,7 @@
 class X86TargetMachine;
 class FunctionPass;
 class MachineCodeEmitter;
+class raw_ostream;
 
 /// createX86ISelDag - This pass converts a legalized DAG into a 
 /// X86-specific DAG, ready for instruction scheduling.
@@ -38,7 +39,7 @@
 /// assembly code for a MachineFunction to the given output stream,
 /// using the given target machine description.
 ///
-FunctionPass *createX86CodePrinterPass(std::ostream &o, X86TargetMachine &tm);
+FunctionPass *createX86CodePrinterPass(raw_ostream &o, X86TargetMachine &tm);
 
 /// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
 /// to the specified MCE object.
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index ba3314c..5be5c5d 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -18,6 +18,7 @@
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Target/TargetMachineRegistry.h"
 using namespace llvm;
@@ -189,7 +190,7 @@
 }
 
 bool X86TargetMachine::addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                          std::ostream &Out) {
+                                          raw_ostream &Out) {
   assert(AsmPrinterCtor && "AsmPrinter was not linked in");
   if (AsmPrinterCtor)
     PM.add(AsmPrinterCtor(Out, *this));
@@ -218,7 +219,7 @@
   if (DumpAsm) {
     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
     if (AsmPrinterCtor)
-      PM.add(AsmPrinterCtor(*cerr.stream(), *this));
+      PM.add(AsmPrinterCtor(errs(), *this));
   }
 
   return false;
@@ -230,7 +231,7 @@
   if (DumpAsm) {
     assert(AsmPrinterCtor && "AsmPrinter was not linked in");
     if (AsmPrinterCtor)
-      PM.add(AsmPrinterCtor(*cerr.stream(), *this));
+      PM.add(AsmPrinterCtor(errs(), *this));
   }
 
   return false;
diff --git a/lib/Target/X86/X86TargetMachine.h b/lib/Target/X86/X86TargetMachine.h
index 94b7566..13b391d 100644
--- a/lib/Target/X86/X86TargetMachine.h
+++ b/lib/Target/X86/X86TargetMachine.h
@@ -25,6 +25,8 @@
 #include "X86ISelLowering.h"
 
 namespace llvm {
+  
+class raw_ostream;
 
 class X86TargetMachine : public LLVMTargetMachine {
   X86Subtarget      Subtarget;
@@ -41,7 +43,7 @@
 
   // To avoid having target depend on the asmprinter stuff libraries, asmprinter
   // set this functions to ctor pointer at startup time if they are linked in.
-  typedef FunctionPass *(*AsmPrinterCtorFn)(std::ostream &o,
+  typedef FunctionPass *(*AsmPrinterCtorFn)(raw_ostream &o,
                                             X86TargetMachine &tm);
   static AsmPrinterCtorFn AsmPrinterCtor;
 
@@ -75,7 +77,7 @@
   virtual bool addPreRegAlloc(PassManagerBase &PM, bool Fast);
   virtual bool addPostRegAlloc(PassManagerBase &PM, bool Fast);
   virtual bool addAssemblyEmitter(PassManagerBase &PM, bool Fast, 
-                                  std::ostream &Out);
+                                  raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, bool Fast,
                               bool DumpAsm, MachineCodeEmitter &MCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM, bool Fast,
diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp
index dfd1f6b..2c725e8 100644
--- a/tools/llc/llc.cpp
+++ b/tools/llc/llc.cpp
@@ -31,6 +31,7 @@
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/PluginLoader.h"
 #include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Analysis/Verifier.h"
 #include "llvm/System/Signals.h"
 #include "llvm/Config/config.h"
@@ -106,10 +107,10 @@
   return outputFilename;
 }
 
-static std::ostream *GetOutputStream(const char *ProgName) {
+static raw_ostream *GetOutputStream(const char *ProgName) {
   if (OutputFilename != "") {
     if (OutputFilename == "-")
-      return &std::cout;
+      return &outs();
 
     // Specified an output filename?
     if (!Force && std::ifstream(OutputFilename.c_str())) {
@@ -123,12 +124,13 @@
     // SIGINT
     sys::RemoveFileOnSignal(sys::Path(OutputFilename));
 
-    return new std::ofstream(OutputFilename.c_str());
+    std::string error;
+    return new raw_fd_ostream(OutputFilename.c_str(), error);
   }
   
   if (InputFilename == "-") {
     OutputFilename = "-";
-    return &std::cout;
+    return &outs();
   }
 
   OutputFilename = GetFileNameRoot(InputFilename);
@@ -165,9 +167,10 @@
   // SIGINT
   sys::RemoveFileOnSignal(sys::Path(OutputFilename));
   
-  std::ostream *Out = new std::ofstream(OutputFilename.c_str());
-  if (!Out->good()) {
-    std::cerr << ProgName << ": error opening " << OutputFilename << "!\n";
+  std::string error;
+  raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), error);
+  if (!error.empty()) {
+    std::cerr << error;
     delete Out;
     return 0;
   }
@@ -229,7 +232,7 @@
   TargetMachine &Target = *target.get();
 
   // Figure out where we are going to send the output...
-  std::ostream *Out = GetOutputStream(argv[0]);
+  raw_ostream *Out = GetOutputStream(argv[0]);
   if (Out == 0) return 1;
   
   // If this target requires addPassesToEmitWholeFile, do it now.  This is
@@ -244,7 +247,7 @@
     if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, Fast)) {
       std::cerr << argv[0] << ": target does not support generation of this"
                 << " file type!\n";
-      if (Out != &std::cout) delete Out;
+      if (Out != &outs()) delete Out;
       // And the Out file is empty and useless, so remove it now.
       sys::Path(OutputFilename).eraseFromDisk();
       return 1;
@@ -271,7 +274,7 @@
     case FileModel::Error:
       std::cerr << argv[0] << ": target does not support generation of this"
                 << " file type!\n";
-      if (Out != &std::cout) delete Out;
+      if (Out != &outs()) delete Out;
       // And the Out file is empty and useless, so remove it now.
       sys::Path(OutputFilename).eraseFromDisk();
       return 1;
@@ -288,7 +291,7 @@
     if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) {
       std::cerr << argv[0] << ": target does not support generation of this"
                 << " file type!\n";
-      if (Out != &std::cout) delete Out;
+      if (Out != &outs()) delete Out;
       // And the Out file is empty and useless, so remove it now.
       sys::Path(OutputFilename).eraseFromDisk();
       return 1;
@@ -306,7 +309,7 @@
   }
     
   // Delete the ostream if it's not a stdout stream
-  if (Out != &std::cout) delete Out;
+  if (Out != &outs()) delete Out;
 
   return 0;
 }
diff --git a/tools/lto/LTOCodeGenerator.cpp b/tools/lto/LTOCodeGenerator.cpp
index ad3964d..275aac2 100644
--- a/tools/lto/LTOCodeGenerator.cpp
+++ b/tools/lto/LTOCodeGenerator.cpp
@@ -27,6 +27,7 @@
 #include "llvm/Support/SystemUtils.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/System/Signals.h"
 #include "llvm/Analysis/Passes.h"
 #include "llvm/Analysis/LoopPass.h"
@@ -162,9 +163,12 @@
     sys::RemoveFileOnSignal(uniqueAsmPath);
        
     // generate assembly code
-    std::ofstream asmFile(uniqueAsmPath.c_str());
-    bool genResult = this->generateAssemblyCode(asmFile, errMsg);
-    asmFile.close();
+    std::string error;
+    bool genResult = false;
+    {
+      raw_fd_ostream asmFile(uniqueAsmPath.c_str(), error);
+      genResult = this->generateAssemblyCode(asmFile, errMsg);
+    }
     if ( genResult ) {
         if ( uniqueAsmPath.exists() )
             uniqueAsmPath.eraseFromDisk();
@@ -309,7 +313,8 @@
 }
 
 /// Optimize merged modules using various IPO passes
-bool LTOCodeGenerator::generateAssemblyCode(std::ostream& out, std::string& errMsg)
+bool LTOCodeGenerator::generateAssemblyCode(raw_ostream& out,
+                                            std::string& errMsg)
 {
     if (  this->determineTarget(errMsg) ) 
         return true;
diff --git a/tools/lto/LTOCodeGenerator.h b/tools/lto/LTOCodeGenerator.h
index d3a2b6b..7a93152 100644
--- a/tools/lto/LTOCodeGenerator.h
+++ b/tools/lto/LTOCodeGenerator.h
@@ -25,6 +25,8 @@
 //
 // C++ class which implements the opaque lto_code_gen_t
 //
+
+class llvm::raw_ostream;
 class LTOCodeGenerator {
 public:
     static const char*        getVersionString();
@@ -41,8 +43,8 @@
     const void*         compile(size_t* length, std::string& errMsg);
     void                setCodeGenDebugOptions(const char *opts); 
 private:
-    bool                generateAssemblyCode(std::ostream& out, 
-                                                        std::string& errMsg);
+    bool                generateAssemblyCode(llvm::raw_ostream& out, 
+                                             std::string& errMsg);
     bool                assemble(const std::string& asmPath, 
                             const std::string& objPath, std::string& errMsg);
     void                applyScopeRestrictions();