First patch in the direction of splitting MachineCodeEmitter in two subclasses:

JITCodeEmitter and ObjectCodeEmitter. No functional changes yet. Patch by Aaron Gray



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72631 91177308-0d34-0410-b5e6-96231b3b80d8

33 files changed, 1103 insertions, 366 deletions

diff --git a/include/llvm/CodeGen/JITCodeEmitter.h b/include/llvm/CodeGen/JITCodeEmitter.h
new file mode 100644
index 0000000000..81a7c60bdb
--- /dev/null
+++ b/include/llvm/CodeGen/JITCodeEmitter.h
@@ -0,0 +1,322 @@
+//===-- llvm/CodeGen/JITCodeEmitter.h - Code emission ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an abstract interface that is used by the machine code
+// emission framework to output the code.  This allows machine code emission to
+// be separated from concerns such as resolution of call targets, and where the
+// machine code will be written (memory or disk, f.e.).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_JITCODEEMITTER_H
+#define LLVM_CODEGEN_JITCODEEMITTER_H
+
+#include <string>
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+
+using namespace std;
+
+namespace llvm {
+
+class MachineBasicBlock;
+class MachineConstantPool;
+class MachineJumpTableInfo;
+class MachineFunction;
+class MachineModuleInfo;
+class MachineRelocation;
+class Value;
+class GlobalValue;
+class Function;
+
+/// JITCodeEmitter - This class defines two sorts of methods: those for
+/// emitting the actual bytes of machine code, and those for emitting auxillary
+/// structures, such as jump tables, relocations, etc.
+///
+/// Emission of machine code is complicated by the fact that we don't (in
+/// general) know the size of the machine code that we're about to emit before
+/// we emit it.  As such, we preallocate a certain amount of memory, and set the
+/// BufferBegin/BufferEnd pointers to the start and end of the buffer.  As we
+/// emit machine instructions, we advance the CurBufferPtr to indicate the
+/// location of the next byte to emit.  In the case of a buffer overflow (we
+/// need to emit more machine code than we have allocated space for), the
+/// CurBufferPtr will saturate to BufferEnd and ignore stores.  Once the entire
+/// function has been emitted, the overflow condition is checked, and if it has
+/// occurred, more memory is allocated, and we reemit the code into it.
+/// 
+class JITCodeEmitter : public MachineCodeEmitter {
+public:
+  virtual ~JITCodeEmitter() {}
+
+  /// startFunction - This callback is invoked when the specified function is
+  /// about to be code generated.  This initializes the BufferBegin/End/Ptr
+  /// fields.
+  ///
+  virtual void startFunction(MachineFunction &F) = 0;
+
+  /// finishFunction - This callback is invoked when the specified function has
+  /// finished code generation.  If a buffer overflow has occurred, this method
+  /// returns true (the callee is required to try again), otherwise it returns
+  /// false.
+  ///
+  virtual bool finishFunction(MachineFunction &F) = 0;
+  
+  /// startGVStub - This callback is invoked when the JIT needs the
+  /// address of a GV (e.g. function) that has not been code generated yet.
+  /// The StubSize specifies the total size required by the stub.
+  ///
+  virtual void startGVStub(const GlobalValue* GV, unsigned StubSize,
+                           unsigned Alignment = 1) = 0;
+
+  /// startGVStub - This callback is invoked when the JIT needs the address of a 
+  /// GV (e.g. function) that has not been code generated yet.  Buffer points to
+  /// memory already allocated for this stub.
+  ///
+  virtual void startGVStub(const GlobalValue* GV, void *Buffer,
+                           unsigned StubSize) = 0;
+  
+  /// finishGVStub - This callback is invoked to terminate a GV stub.
+  ///
+  virtual void *finishGVStub(const GlobalValue* F) = 0;
+
+  /// emitByte - This callback is invoked when a byte needs to be written to the
+  /// output stream.
+  ///
+  void emitByte(unsigned char B) {
+    if (CurBufferPtr != BufferEnd)
+      *CurBufferPtr++ = B;
+  }
+
+  /// emitWordLE - This callback is invoked when a 32-bit word needs to be
+  /// written to the output stream in little-endian format.
+  ///
+  void emitWordLE(unsigned W) {
+    if (4 <= BufferEnd-CurBufferPtr) {
+      *CurBufferPtr++ = (unsigned char)(W >>  0);
+      *CurBufferPtr++ = (unsigned char)(W >>  8);
+      *CurBufferPtr++ = (unsigned char)(W >> 16);
+      *CurBufferPtr++ = (unsigned char)(W >> 24);
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+  /// emitWordBE - This callback is invoked when a 32-bit word needs to be
+  /// written to the output stream in big-endian format.
+  ///
+  void emitWordBE(unsigned W) {
+    if (4 <= BufferEnd-CurBufferPtr) {
+      *CurBufferPtr++ = (unsigned char)(W >> 24);
+      *CurBufferPtr++ = (unsigned char)(W >> 16);
+      *CurBufferPtr++ = (unsigned char)(W >>  8);
+      *CurBufferPtr++ = (unsigned char)(W >>  0);
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+
+  /// emitDWordLE - This callback is invoked when a 64-bit word needs to be
+  /// written to the output stream in little-endian format.
+  ///
+  void emitDWordLE(uint64_t W) {
+    if (8 <= BufferEnd-CurBufferPtr) {
+      *CurBufferPtr++ = (unsigned char)(W >>  0);
+      *CurBufferPtr++ = (unsigned char)(W >>  8);
+      *CurBufferPtr++ = (unsigned char)(W >> 16);
+      *CurBufferPtr++ = (unsigned char)(W >> 24);
+      *CurBufferPtr++ = (unsigned char)(W >> 32);
+      *CurBufferPtr++ = (unsigned char)(W >> 40);
+      *CurBufferPtr++ = (unsigned char)(W >> 48);
+      *CurBufferPtr++ = (unsigned char)(W >> 56);
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+  /// emitDWordBE - This callback is invoked when a 64-bit word needs to be
+  /// written to the output stream in big-endian format.
+  ///
+  void emitDWordBE(uint64_t W) {
+    if (8 <= BufferEnd-CurBufferPtr) {
+      *CurBufferPtr++ = (unsigned char)(W >> 56);
+      *CurBufferPtr++ = (unsigned char)(W >> 48);
+      *CurBufferPtr++ = (unsigned char)(W >> 40);
+      *CurBufferPtr++ = (unsigned char)(W >> 32);
+      *CurBufferPtr++ = (unsigned char)(W >> 24);
+      *CurBufferPtr++ = (unsigned char)(W >> 16);
+      *CurBufferPtr++ = (unsigned char)(W >>  8);
+      *CurBufferPtr++ = (unsigned char)(W >>  0);
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+
+  /// emitAlignment - Move the CurBufferPtr pointer up the the specified
+  /// alignment (saturated to BufferEnd of course).
+  void emitAlignment(unsigned Alignment) {
+    if (Alignment == 0) Alignment = 1;
+
+    if(Alignment <= (uintptr_t)(BufferEnd-CurBufferPtr)) {
+      // Move the current buffer ptr up to the specified alignment.
+      CurBufferPtr =
+        (unsigned char*)(((uintptr_t)CurBufferPtr+Alignment-1) &
+                         ~(uintptr_t)(Alignment-1));
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+
+  /// emitULEB128Bytes - This callback is invoked when a ULEB128 needs to be
+  /// written to the output stream.
+  void emitULEB128Bytes(unsigned Value) {
+    do {
+      unsigned char Byte = Value & 0x7f;
+      Value >>= 7;
+      if (Value) Byte |= 0x80;
+      emitByte(Byte);
+    } while (Value);
+  }
+  
+  /// emitSLEB128Bytes - This callback is invoked when a SLEB128 needs to be
+  /// written to the output stream.
+  void emitSLEB128Bytes(int Value) {
+    int Sign = Value >> (8 * sizeof(Value) - 1);
+    bool IsMore;
+  
+    do {
+      unsigned char Byte = Value & 0x7f;
+      Value >>= 7;
+      IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+      if (IsMore) Byte |= 0x80;
+      emitByte(Byte);
+    } while (IsMore);
+  }
+
+  /// emitString - This callback is invoked when a String needs to be
+  /// written to the output stream.
+  void emitString(const std::string &String) {
+    for (unsigned i = 0, N = static_cast<unsigned>(String.size());
+         i < N; ++i) {
+      unsigned char C = String[i];
+      emitByte(C);
+    }
+    emitByte(0);
+  }
+  
+  /// emitInt32 - Emit a int32 directive.
+  void emitInt32(int Value) {
+    if (4 <= BufferEnd-CurBufferPtr) {
+      *((uint32_t*)CurBufferPtr) = Value;
+      CurBufferPtr += 4;
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+
+  /// emitInt64 - Emit a int64 directive.
+  void emitInt64(uint64_t Value) {
+    if (8 <= BufferEnd-CurBufferPtr) {
+      *((uint64_t*)CurBufferPtr) = Value;
+      CurBufferPtr += 8;
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+  /// emitInt32At - Emit the Int32 Value in Addr.
+  void emitInt32At(uintptr_t *Addr, uintptr_t Value) {
+    if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd)
+      (*(uint32_t*)Addr) = (uint32_t)Value;
+  }
+  
+  /// emitInt64At - Emit the Int64 Value in Addr.
+  void emitInt64At(uintptr_t *Addr, uintptr_t Value) {
+    if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd)
+      (*(uint64_t*)Addr) = (uint64_t)Value;
+  }
+  
+  
+  /// emitLabel - Emits a label
+  virtual void emitLabel(uint64_t LabelID) = 0;
+
+  /// allocateSpace - Allocate a block of space in the current output buffer,
+  /// returning null (and setting conditions to indicate buffer overflow) on
+  /// failure.  Alignment is the alignment in bytes of the buffer desired.
+  virtual void *allocateSpace(uintptr_t Size, unsigned Alignment) {
+    emitAlignment(Alignment);
+    void *Result;
+    
+    // Check for buffer overflow.
+    if (Size >= (uintptr_t)(BufferEnd-CurBufferPtr)) {
+      CurBufferPtr = BufferEnd;
+      Result = 0;
+    } else {
+      // Allocate the space.
+      Result = CurBufferPtr;
+      CurBufferPtr += Size;
+    }
+    
+    return Result;
+  }
+
+  /// StartMachineBasicBlock - This should be called by the target when a new
+  /// basic block is about to be emitted.  This way the MCE knows where the
+  /// start of the block is, and can implement getMachineBasicBlockAddress.
+  virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) = 0;
+  
+  /// getCurrentPCValue - This returns the address that the next emitted byte
+  /// will be output to.
+  ///
+  virtual uintptr_t getCurrentPCValue() const {
+    return (uintptr_t)CurBufferPtr;
+  }
+
+  /// getCurrentPCOffset - Return the offset from the start of the emitted
+  /// buffer that we are currently writing to.
+  uintptr_t getCurrentPCOffset() const {
+    return CurBufferPtr-BufferBegin;
+  }
+
+  /// addRelocation - Whenever a relocatable address is needed, it should be
+  /// noted with this interface.
+  virtual void addRelocation(const MachineRelocation &MR) = 0;
+  
+  /// FIXME: These should all be handled with relocations!
+  
+  /// getConstantPoolEntryAddress - Return the address of the 'Index' entry in
+  /// the constant pool that was last emitted with the emitConstantPool method.
+  ///
+  virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const = 0;
+
+  /// getJumpTableEntryAddress - Return the address of the jump table with index
+  /// 'Index' in the function that last called initJumpTableInfo.
+  ///
+  virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const = 0;
+  
+  /// getMachineBasicBlockAddress - Return the address of the specified
+  /// MachineBasicBlock, only usable after the label for the MBB has been
+  /// emitted.
+  ///
+  virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
+
+  /// getLabelAddress - Return the address of the specified LabelID, only usable
+  /// after the LabelID has been emitted.
+  ///
+  virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
+  
+  /// Specifies the MachineModuleInfo object. This is used for exception handling
+  /// purposes.
+  virtual void setModuleInfo(MachineModuleInfo* Info) = 0;
+};
+
+} // End llvm namespace
+
+#endif
diff --git a/include/llvm/Target/TargetJITInfo.h b/include/llvm/Target/TargetJITInfo.h
index 3f48da9f40..9545689cb7 100644
--- a/include/llvm/Target/TargetJITInfo.h
+++ b/include/llvm/Target/TargetJITInfo.h
@@ -23,7 +23,7 @@
 namespace llvm {
   class Function;
   class GlobalValue;
-  class MachineCodeEmitter;
+  class JITCodeEmitter;
   class MachineRelocation;
 
   /// TargetJITInfo - Target specific information required by the Just-In-Time
@@ -39,29 +39,29 @@ namespace llvm {
     ///
     virtual void replaceMachineCodeForFunction(void *Old, void *New) = 0;
 
-    /// emitGlobalValueIndirectSym - Use the specified MachineCodeEmitter object
+    /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
     /// to emit an indirect symbol which contains the address of the specified
     /// ptr.
     virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
-                                             MachineCodeEmitter &MCE) {
+                                             JITCodeEmitter &JCE) {
       assert(0 && "This target doesn't implement emitGlobalValueIndirectSym!");
       return 0;
     }
 
-    /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
+    /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
     /// small native function that simply calls the function at the specified
     /// address.  Return the address of the resultant function.
     virtual void *emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE) {
+                                   JITCodeEmitter &JCE) {
       assert(0 && "This target doesn't implement emitFunctionStub!");
       return 0;
     }
     
-    /// emitFunctionStubAtAddr - Use the specified MachineCodeEmitter object to
+    /// emitFunctionStubAtAddr - Use the specified JITCodeEmitter object to
     /// emit a small native function that simply calls Fn. Emit the stub into
     /// the supplied buffer.
     virtual void emitFunctionStubAtAddr(const Function* F, void *Fn,
-                                        void *Buffer, MachineCodeEmitter &MCE) {
+                                        void *Buffer, JITCodeEmitter &JCE) {
       assert(0 && "This target doesn't implement emitFunctionStubAtAddr!");
     }
 
@@ -125,7 +125,7 @@ namespace llvm {
 
     /// allocateSeparateGVMemory - If true, globals should be placed in
     /// separately allocated heap memory rather than in the same
-    /// code memory allocated by MachineCodeEmitter.
+    /// code memory allocated by JITCodeEmitter.
     virtual bool allocateSeparateGVMemory() const { return false; }
   protected:
     bool useGOT;
diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h
index 405f22eeb4..bdcc4eff67 100644
--- a/include/llvm/Target/TargetMachine.h
+++ b/include/llvm/Target/TargetMachine.h
@@ -28,6 +28,7 @@ class TargetJITInfo;
 class TargetLowering;
 class TargetFrameInfo;
 class MachineCodeEmitter;
+class JITCodeEmitter;
 class TargetRegisterInfo;
 class Module;
 class PassManagerBase;
@@ -236,6 +237,16 @@ public:
     return true;
   }
  
+  /// addPassesToEmitFileFinish - If the passes to emit the specified file had
+  /// to be split up (e.g., to add an object writer pass), this method can be
+  /// used to finish up adding passes to emit the file, if necessary.
+  ///
+  virtual bool addPassesToEmitFileFinish(PassManagerBase &,
+                                         JITCodeEmitter *,
+                                         CodeGenOpt::Level) {
+    return true;
+  }
+ 
   /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
   /// get machine code emitted.  This uses a MachineCodeEmitter object to handle
   /// actually outputting the machine code and resolving things like the address
@@ -248,6 +259,18 @@ public:
     return true;
   }
 
+  /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
+  /// get machine code emitted.  This uses a MachineCodeEmitter object to handle
+  /// actually outputting the machine code and resolving things like the address
+  /// of functions.  This method returns true if machine code emission is
+  /// not supported.
+  ///
+  virtual bool addPassesToEmitMachineCode(PassManagerBase &,
+                                          JITCodeEmitter &,
+                                          CodeGenOpt::Level) {
+    return true;
+  }
+
   /// addPassesToEmitWholeFile - This method can be implemented by targets that 
   /// require having the entire module at once.  This is not recommended, do not
   /// use this.
@@ -297,6 +320,14 @@ public:
                                          MachineCodeEmitter *MCE,
                                          CodeGenOpt::Level);
  
+  /// addPassesToEmitFileFinish - If the passes to emit the specified file had
+  /// to be split up (e.g., to add an object writer pass), this method can be
+  /// used to finish up adding passes to emit the file, if necessary.
+  ///
+  virtual bool addPassesToEmitFileFinish(PassManagerBase &PM,
+                                         JITCodeEmitter *MCE,
+                                         CodeGenOpt::Level);
+ 
   /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
   /// get machine code emitted.  This uses a MachineCodeEmitter object to handle
   /// actually outputting the machine code and resolving things like the address
@@ -307,6 +338,16 @@ public:
                                           MachineCodeEmitter &MCE,
                                           CodeGenOpt::Level);
   
+  /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
+  /// get machine code emitted.  This uses a MachineCodeEmitter object to handle
+  /// actually outputting the machine code and resolving things like the address
+  /// of functions.  This method returns true if machine code emission is
+  /// not supported.
+  ///
+  virtual bool addPassesToEmitMachineCode(PassManagerBase &PM,
+                                          JITCodeEmitter &MCE,
+                                          CodeGenOpt::Level);
+  
   /// Target-Independent Code Generator Pass Configuration Options.
   
   /// addInstSelector - This method should add any "last minute" LLVM->LLVM
@@ -355,6 +396,14 @@ public:
     return true;
   }
 
+  /// addCodeEmitter - This pass should be overridden by the target to add a
+  /// code emitter, if supported.  If this is not supported, 'true' should be
+  /// returned. If DumpAsm is true, the generated assembly is printed to cerr.
+  virtual bool addCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
+                              bool /*DumpAsm*/, JITCodeEmitter &) {
+    return true;
+  }
+
   /// addSimpleCodeEmitter - This pass should be overridden by the target to add
   /// a code emitter (without setting flags), if supported.  If this is not
   /// supported, 'true' should be returned.  If DumpAsm is true, the generated
@@ -364,6 +413,15 @@ public:
     return true;
   }
 
+  /// addSimpleCodeEmitter - This pass should be overridden by the target to add
+  /// a code emitter (without setting flags), if supported.  If this is not
+  /// supported, 'true' should be returned.  If DumpAsm is true, the generated
+  /// assembly is printed to cerr.
+  virtual bool addSimpleCodeEmitter(PassManagerBase &, CodeGenOpt::Level,
+                                    bool /*DumpAsm*/, JITCodeEmitter &) {
+    return true;
+  }
+
   /// getEnableTailMergeDefault - the default setting for -enable-tail-merge
   /// on this target.  User flag overrides.
   virtual bool getEnableTailMergeDefault() const { return true; }
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 41a047780e..b3c60e6393 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -109,6 +109,23 @@ bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
   return false; // success!
 }
 
+/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
+/// be split up (e.g., to add an object writer pass), this method can be used to
+/// finish up adding passes to emit the file, if necessary.
+bool LLVMTargetMachine::addPassesToEmitFileFinish(PassManagerBase &PM,
+                                                  JITCodeEmitter *JCE,
+                                                  CodeGenOpt::Level OptLevel) {
+  if (JCE)
+    addSimpleCodeEmitter(PM, OptLevel, PrintEmittedAsm, *JCE);
+
+  PM.add(createGCInfoDeleter());
+
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
+  return false; // success!
+}
+
 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
 /// get machine code emitted.  This uses a MachineCodeEmitter object to handle
 /// actually outputting the machine code and resolving things like the address
@@ -135,6 +152,32 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
   return false; // success!
 }
 
+/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
+/// get machine code emitted.  This uses a MachineCodeEmitter object to handle
+/// actually outputting the machine code and resolving things like the address
+/// of functions.  This method should returns true if machine code emission is
+/// not supported.
+///
+bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
+                                                   JITCodeEmitter &JCE,
+                                                   CodeGenOpt::Level OptLevel) {
+  // Add common CodeGen passes.
+  if (addCommonCodeGenPasses(PM, OptLevel))
+    return true;
+
+  if (addPreEmitPass(PM, OptLevel) && PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(cerr));
+
+  addCodeEmitter(PM, OptLevel, PrintEmittedAsm, JCE);
+
+  PM.add(createGCInfoDeleter());
+
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+
+  return false; // success!
+}
+
 static void printAndVerify(PassManagerBase &PM,
                            bool allowDoubleDefs = false) {
   if (PrintMachineCode)
diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp
index 522a08dd78..f8ae884461 100644
--- a/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/lib/ExecutionEngine/JIT/JIT.cpp
@@ -19,7 +19,7 @@
 #include "llvm/GlobalVariable.h"
 #include "llvm/Instructions.h"
 #include "llvm/ModuleProvider.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
 #include "llvm/CodeGen/MachineCodeInfo.h"
 #include "llvm/Target/TargetData.h"
@@ -214,8 +214,8 @@ JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
 
   jitstate = new JITState(MP);
 
-  // Initialize MCE
-  MCE = createEmitter(*this, JMM);
+  // Initialize JCE
+  JCE = createEmitter(*this, JMM);
 
   // Add target data
   MutexGuard locked(lock);
@@ -224,7 +224,7 @@ JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
 
   // Turn the machine code intermediate representation into bytes in memory that
   // may be executed.
-  if (TM.addPassesToEmitMachineCode(PM, *MCE, OptLevel)) {
+  if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
     cerr << "Target does not support machine code emission!\n";
     abort();
   }
@@ -253,7 +253,7 @@ JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
 
 JIT::~JIT() {
   delete jitstate;
-  delete MCE;
+  delete JCE;
   delete &TM;
 }
 
@@ -273,7 +273,7 @@ void JIT::addModuleProvider(ModuleProvider *MP) {
 
     // Turn the machine code intermediate representation into bytes in memory
     // that may be executed.
-    if (TM.addPassesToEmitMachineCode(PM, *MCE, CodeGenOpt::Default)) {
+    if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
       cerr << "Target does not support machine code emission!\n";
       abort();
     }
@@ -306,7 +306,7 @@ Module *JIT::removeModuleProvider(ModuleProvider *MP, std::string *E) {
     
     // Turn the machine code intermediate representation into bytes in memory
     // that may be executed.
-    if (TM.addPassesToEmitMachineCode(PM, *MCE, CodeGenOpt::Default)) {
+    if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
       cerr << "Target does not support machine code emission!\n";
       abort();
     }
@@ -338,7 +338,7 @@ void JIT::deleteModuleProvider(ModuleProvider *MP, std::string *E) {
     
     // Turn the machine code intermediate representation into bytes in memory
     // that may be executed.
-    if (TM.addPassesToEmitMachineCode(PM, *MCE, CodeGenOpt::Default)) {
+    if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
       cerr << "Target does not support machine code emission!\n";
       abort();
     }
@@ -654,7 +654,7 @@ void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
         Ptr = (char*)Ptr + (MisAligned ? (A-MisAligned) : 0);
       }
     } else {
-      Ptr = MCE->allocateSpace(S, A);
+      Ptr = JCE->allocateSpace(S, A);
     }
     addGlobalMapping(GV, Ptr);
     EmitGlobalVariable(GV);
diff --git a/lib/ExecutionEngine/JIT/JIT.h b/lib/ExecutionEngine/JIT/JIT.h
index 02955ab3ad..9924d0bfa9 100644
--- a/lib/ExecutionEngine/JIT/JIT.h
+++ b/lib/ExecutionEngine/JIT/JIT.h
@@ -51,7 +51,7 @@ public:
 class JIT : public ExecutionEngine {
   TargetMachine &TM;       // The current target we are compiling to
   TargetJITInfo &TJI;      // The JITInfo for the target we are compiling to
-  MachineCodeEmitter *MCE; // MCE object
+  JITCodeEmitter *JCE; // JCE object
 
   JITState *jitstate;
 
@@ -147,7 +147,7 @@ public:
   void addPendingFunction(Function *F);
   
   /// getCodeEmitter - Return the code emitter this JIT is emitting into.
-  MachineCodeEmitter *getCodeEmitter() const { return MCE; }
+  JITCodeEmitter *getCodeEmitter() const { return JCE; }
   
   static ExecutionEngine *createJIT(ModuleProvider *MP, std::string *Err,
                                     JITMemoryManager *JMM,
@@ -158,7 +158,7 @@ public:
   void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
 
 private:
-  static MachineCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
+  static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
   void registerMachineCodeInfo(MachineCodeInfo *MCI);
   void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
   void updateFunctionStub(Function *F);
diff --git a/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp b/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
index bb2f92bb02..e101ef371e 100644
--- a/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp
@@ -16,7 +16,7 @@
 #include "JITDwarfEmitter.h"
 #include "llvm/Function.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineLocation.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
@@ -34,7 +34,7 @@ JITDwarfEmitter::JITDwarfEmitter(JIT& theJit) : Jit(theJit) {}
 
 
 unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F, 
-                                               MachineCodeEmitter& mce,
+                                               JITCodeEmitter& jce,
                                                unsigned char* StartFunction,
                                                unsigned char* EndFunction) {
   const TargetMachine& TM = F.getTarget();
@@ -42,7 +42,7 @@ unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F,
   needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
   stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
   RI = TM.getRegisterInfo();
-  MCE = &mce;
+  JCE = &jce;
   
   unsigned char* ExceptionTable = EmitExceptionTable(&F, StartFunction,
                                                      EndFunction);
@@ -81,15 +81,15 @@ JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr,
     }
     
     intptr_t LabelPtr = 0;
-    if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
+    if (LabelID) LabelPtr = JCE->getLabelAddress(LabelID);
 
     const MachineLocation &Dst = Move.getDestination();
     const MachineLocation &Src = Move.getSource();
     
     // Advance row if new location.
     if (BaseLabelPtr && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
-      MCE->emitByte(dwarf::DW_CFA_advance_loc4);
-      MCE->emitInt32(LabelPtr - BaseLabelPtr);
+      JCE->emitByte(dwarf::DW_CFA_advance_loc4);
+      JCE->emitInt32(LabelPtr - BaseLabelPtr);
       
       BaseLabelID = LabelID; 
       BaseLabelPtr = LabelPtr;
@@ -100,23 +100,23 @@ JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr,
     if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
       if (!Src.isReg()) {
         if (Src.getReg() == MachineLocation::VirtualFP) {
-          MCE->emitByte(dwarf::DW_CFA_def_cfa_offset);
+          JCE->emitByte(dwarf::DW_CFA_def_cfa_offset);
         } else {
-          MCE->emitByte(dwarf::DW_CFA_def_cfa);
-          MCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), true));
+          JCE->emitByte(dwarf::DW_CFA_def_cfa);
+          JCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), true));
         }
         
         int Offset = -Src.getOffset();
         
-        MCE->emitULEB128Bytes(Offset);
+        JCE->emitULEB128Bytes(Offset);
       } else {
         assert(0 && "Machine move no supported yet.");
       }
     } else if (Src.isReg() &&
       Src.getReg() == MachineLocation::VirtualFP) {
       if (Dst.isReg()) {
-        MCE->emitByte(dwarf::DW_CFA_def_cfa_register);
-        MCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), true));
+        JCE->emitByte(dwarf::DW_CFA_def_cfa_register);
+        JCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), true));
       } else {
         assert(0 && "Machine move no supported yet.");
       }
@@ -125,16 +125,16 @@ JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr,
       int Offset = Dst.getOffset() / stackGrowth;
       
       if (Offset < 0) {
-        MCE->emitByte(dwarf::DW_CFA_offset_extended_sf);
-        MCE->emitULEB128Bytes(Reg);
-        MCE->emitSLEB128Bytes(Offset);
+        JCE->emitByte(dwarf::DW_CFA_offset_extended_sf);
+        JCE->emitULEB128Bytes(Reg);
+        JCE->emitSLEB128Bytes(Offset);
       } else if (Reg < 64) {
-        MCE->emitByte(dwarf::DW_CFA_offset + Reg);
-        MCE->emitULEB128Bytes(Offset);
+        JCE->emitByte(dwarf::DW_CFA_offset + Reg);
+        JCE->emitULEB128Bytes(Offset);
       } else {
-        MCE->emitByte(dwarf::DW_CFA_offset_extended);
-        MCE->emitULEB128Bytes(Reg);
-        MCE->emitULEB128Bytes(Offset);
+        JCE->emitByte(dwarf::DW_CFA_offset_extended);
+        JCE->emitULEB128Bytes(Reg);
+        JCE->emitULEB128Bytes(Offset);
       }
     }
   }
@@ -403,24 +403,24 @@ unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
   unsigned SizeAlign = (4 - TotalSize) & 3;
 
   // Begin the exception table.
-  MCE->emitAlignment(4);
+  JCE->emitAlignment(4);
   for (unsigned i = 0; i != SizeAlign; ++i) {
-    MCE->emitByte(0);
+    JCE->emitByte(0);
     // Asm->EOL("Padding");
   }
   
-  unsigned char* DwarfExceptionTable = (unsigned char*)MCE->getCurrentPCValue();
+  unsigned char* DwarfExceptionTable = (unsigned char*)JCE->getCurrentPCValue();
 
   // Emit the header.
-  MCE->emitByte(dwarf::DW_EH_PE_omit);
+  JCE->emitByte(dwarf::DW_EH_PE_omit);
   // Asm->EOL("LPStart format (DW_EH_PE_omit)");
-  MCE->emitByte(dwarf::DW_EH_PE_absptr);
+  JCE->emitByte(dwarf::DW_EH_PE_absptr);
   // Asm->EOL("TType format (DW_EH_PE_absptr)");
-  MCE->emitULEB128Bytes(TypeOffset);
+  JCE->emitULEB128Bytes(TypeOffset);
   // Asm->EOL("TType base offset");
-  MCE->emitByte(dwarf::DW_EH_PE_udata4);
+  JCE->emitByte(dwarf::DW_EH_PE_udata4);
   // Asm->EOL("Call site format (DW_EH_PE_udata4)");
-  MCE->emitULEB128Bytes(SizeSites);
+  JCE->emitULEB128Bytes(SizeSites);
   // Asm->EOL("Call-site table length");
 
   // Emit the landing pad site information.
@@ -431,32 +431,32 @@ unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
 
     if (!S.BeginLabel) {
       BeginLabelPtr = (intptr_t)StartFunction;
-      MCE->emitInt32(0);
+      JCE->emitInt32(0);
     } else {
-      BeginLabelPtr = MCE->getLabelAddress(S.BeginLabel);
-      MCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction);
+      BeginLabelPtr = JCE->getLabelAddress(S.BeginLabel);
+      JCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction);
     }
 
     // Asm->EOL("Region start");
 
     if (!S.EndLabel) {
       EndLabelPtr = (intptr_t)EndFunction;
-      MCE->emitInt32((intptr_t)EndFunction - BeginLabelPtr);
+      JCE->emitInt32((intptr_t)EndFunction - BeginLabelPtr);
     } else {
-      EndLabelPtr = MCE->getLabelAddress(S.EndLabel);
-      MCE->emitInt32(EndLabelPtr - BeginLabelPtr);
+      EndLabelPtr = JCE->getLabelAddress(S.EndLabel);
+      JCE->emitInt32(EndLabelPtr - BeginLabelPtr);
     }
     //Asm->EOL("Region length");
 
     if (!S.PadLabel) {
-      MCE->emitInt32(0);
+      JCE->emitInt32(0);
     } else {
-      unsigned PadLabelPtr = MCE->getLabelAddress(S.PadLabel);
-      MCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction);
+      unsigned PadLabelPtr = JCE->getLabelAddress(S.PadLabel);
+      JCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction);
     }
     // Asm->EOL("Landing pad");
 
-    MCE->emitULEB128Bytes(S.Action);
+    JCE->emitULEB128Bytes(S.Action);
     // Asm->EOL("Action");
   }
 
@@ -464,9 +464,9 @@ unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
   for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
     ActionEntry &Action = Actions[I];
 
-    MCE->emitSLEB128Bytes(Action.ValueForTypeID);
+    JCE->emitSLEB128Bytes(Action.ValueForTypeID);
     //Asm->EOL("TypeInfo index");
-    MCE->emitSLEB128Bytes(Action.NextAction);
+    JCE->emitSLEB128Bytes(Action.NextAction);
     //Asm->EOL("Next action");
   }
 
@@ -476,15 +476,15 @@ unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
     
     if (GV) {
       if (TD->getPointerSize() == sizeof(int32_t)) {
-        MCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV));
+        JCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV));
       } else {
-        MCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV));
+        JCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV));
       }
     } else {
       if (TD->getPointerSize() == sizeof(int32_t))
-        MCE->emitInt32(0);
+        JCE->emitInt32(0);
       else
-        MCE->emitInt64(0);
+        JCE->emitInt64(0);
     }
     // Asm->EOL("TypeInfo");
   }
@@ -492,11 +492,11 @@ unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
   // Emit the filter typeids.
   for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
     unsigned TypeID = FilterIds[j];
-    MCE->emitULEB128Bytes(TypeID);
+    JCE->emitULEB128Bytes(TypeID);
     //Asm->EOL("Filter TypeInfo index");
   }
   
-  MCE->emitAlignment(4);
+  JCE->emitAlignment(4);
 
   return DwarfExceptionTable;
 }
@@ -507,48 +507,48 @@ JITDwarfEmitter::EmitCommonEHFrame(const Function* Personality) const {
   int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
           PointerSize : -PointerSize;
   
-  unsigned char* StartCommonPtr = (unsigned char*)MCE->getCurrentPCValue();
+  unsigned char* StartCommonPtr = (unsigned char*)JCE->getCurrentPCValue();
   // EH Common Frame header
-  MCE->allocateSpace(4, 0);
-  unsigned char* FrameCommonBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
-  MCE->emitInt32((int)0);
-  MCE->emitByte(dwarf::DW_CIE_VERSION);
-  MCE->emitString(Personality ? "zPLR" : "zR");
-  MCE->emitULEB128Bytes(1);
-  MCE->emitSLEB128Bytes(stackGrowth);
-  MCE->emitByte(RI->getDwarfRegNum(RI->getRARegister(), true));
+  JCE->allocateSpace(4, 0);
+  unsigned char* FrameCommonBeginPtr = (unsigned char*)JCE->getCurrentPCValue();
+  JCE->emitInt32((int)0);
+  JCE->emitByte(dwarf::DW_CIE_VERSION);
+  JCE->emitString(Personality ? "zPLR" : "zR");
+  JCE->emitULEB128Bytes(1);
+  JCE->emitSLEB128Bytes(stackGrowth);
+  JCE->emitByte(RI->getDwarfRegNum(RI->getRARegister(), true));
   
   if (Personality) {
     // Augmentation Size: 3 small ULEBs of one byte each, and the personality
     // function which size is PointerSize.
-    MCE->emitULEB128Bytes(3 + PointerSize); 
+    JCE->emitULEB128Bytes(3 + PointerSize); 
     
     // We set the encoding of the personality as direct encoding because we use
     // the function pointer. The encoding is not relative because the current
     // PC value may be bigger than the personality function pointer.
     if (PointerSize == 4) {
-      MCE->emitByte(dwarf::DW_EH_PE_sdata4); 
-      MCE->emitInt32(((intptr_t)Jit.getPointerToGlobal(Personality)));
+      JCE->emitByte(dwarf::DW_EH_PE_sdata4); 
+      JCE->emitInt32(((intptr_t)Jit.getPointerToGlobal(Personality)));
     } else {
-      MCE->emitByte(dwarf::DW_EH_PE_sdata8);
-      MCE->emitInt64(((intptr_t)Jit.getPointerToGlobal(Personality)));
+      JCE->emitByte(dwarf::DW_EH_PE_sdata8);
+      JCE->emitInt64(((intptr_t)Jit.getPointerToGlobal(Personality)));
     }
     
-    MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
-    MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
+    JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
+    JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
       
   } else {
-    MCE->emitULEB128Bytes(1);
-    MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
+    JCE->emitULEB128Bytes(1);
+    JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
   }
 
   std::vector<MachineMove> Moves;
   RI->getInitialFrameState(Moves);
   EmitFrameMoves(0, Moves);
-  MCE->emitAlignment(PointerSize);
+  JCE->emitAlignment(PointerSize);
   
-  MCE->emitInt32At((uintptr_t*)StartCommonPtr, 
-              (uintptr_t)((unsigned char*)MCE->getCurrentPCValue() - 
+  JCE->emitInt32At((uintptr_t*)StartCommonPtr, 
+              (uintptr_t)((unsigned char*)JCE->getCurrentPCValue() - 
                           FrameCommonBeginPtr));
 
   return StartCommonPtr;
@@ -564,46 +564,46 @@ JITDwarfEmitter::EmitEHFrame(const Function* Personality,
   unsigned PointerSize = TD->getPointerSize();
   
   // EH frame header.
-  unsigned char* StartEHPtr = (unsigned char*)MCE->getCurrentPCValue();
-  MCE->allocateSpace(4, 0);
-  unsigned char* FrameBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
+  unsigned char* StartEHPtr = (unsigned char*)JCE->getCurrentPCValue();
+  JCE->allocateSpace(4, 0);
+  unsigned char* FrameBeginPtr = (unsigned char*)JCE->getCurrentPCValue();
   // FDE CIE Offset
-  MCE->emitInt32(FrameBeginPtr - StartCommonPtr);
-  MCE->emitInt32(StartFunction - (unsigned char*)MCE->getCurrentPCValue());
-  MCE->emitInt32(EndFunction - StartFunction);
+  JCE->emitInt32(FrameBeginPtr - StartCommonPtr);
+  JCE->emitInt32(StartFunction - (unsigned char*)JCE->getCurrentPCValue());
+  JCE->emitInt32(EndFunction - StartFunction);
 
   // If there is a personality and landing pads then point to the language
   // specific data area in the exception table.
   if (MMI->getPersonalityIndex()) {
-    MCE->emitULEB128Bytes(4);
+    JCE->emitULEB128Bytes(4);
         
     if (!MMI->getLandingPads().empty()) {
-      MCE->emitInt32(ExceptionTable - (unsigned char*)MCE->getCurrentPCValue());
+      JCE->emitInt32(ExceptionTable - (unsigned char*)JCE->getCurrentPCValue());
     } else {
-      MCE->emitInt32((int)0);
+      JCE->emitInt32((int)0);
     }
   } else {
-    MCE->emitULEB128Bytes(0);
+    JCE->emitULEB128Bytes(0);
   }
       
   // Indicate locations of function specific  callee saved registers in
   // frame.
   EmitFrameMoves((intptr_t)StartFunction, MMI->getFrameMoves());
       
-  MCE->emitAlignment(PointerSize);
+  JCE->emitAlignment(PointerSize);
   
   // Indicate the size of the table
-  MCE->emitInt32At((uintptr_t*)StartEHPtr, 
-              (uintptr_t)((unsigned char*)MCE->getCurrentPCValue() - 
+  JCE->emitInt32At((uintptr_t*)StartEHPtr, 
+              (uintptr_t)((unsigned char*)JCE->getCurrentPCValue() - 
                           StartEHPtr));
   
   // Double zeroes for the unwind runtime
   if (PointerSize == 8) {
-    MCE->emitInt64(0);
-    MCE->emitInt64(0);
+    JCE->emitInt64(0);
+    JCE->emitInt64(0);
   } else {
-    MCE->emitInt32(0);
-    MCE->emitInt32(0);
+    JCE->emitInt32(0);
+    JCE->emitInt32(0);
   }
 
   
@@ -611,7 +611,7 @@ JITDwarfEmitter::EmitEHFrame(const Function* Personality,
 }
 
 unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
-                                         MachineCodeEmitter& mce,
+                                         JITCodeEmitter& jce,
                                          unsigned char* StartFunction,
                                          unsigned char* EndFunction) {
   const TargetMachine& TM = F.getTarget();
@@ -619,7 +619,7 @@ unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
   needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
   stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
   RI = TM.getRegisterInfo();
-  MCE = &mce;
+  JCE = &jce;
   unsigned FinalSize = 0;
   
   FinalSize += GetExceptionTableSizeInBytes(&F);
@@ -733,7 +733,7 @@ JITDwarfEmitter::GetFrameMovesSizeInBytes(intptr_t BaseLabelPtr,
     }
     
     intptr_t LabelPtr = 0;
-    if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
+    if (LabelID) LabelPtr = JCE->getLabelAddress(LabelID);
 
     const MachineLocation &Dst = Move.getDestination();
     const MachineLocation &Src = Move.getSource();
diff --git a/lib/ExecutionEngine/JIT/JITDwarfEmitter.h b/lib/ExecutionEngine/JIT/JITDwarfEmitter.h
index cf5681e3c1..9120ed44e6 100644
--- a/lib/ExecutionEngine/JIT/JITDwarfEmitter.h
+++ b/lib/ExecutionEngine/JIT/JITDwarfEmitter.h
@@ -18,7 +18,7 @@
 namespace llvm {
 
 class Function;
-class MachineCodeEmitter;
+class JITCodeEmitter;
 class MachineFunction;
 class MachineModuleInfo;
 class MachineMove;
@@ -28,7 +28,7 @@ class TargetRegisterInfo;
 
 class JITDwarfEmitter {
   const TargetData* TD;
-  MachineCodeEmitter* MCE;
+  JITCodeEmitter* JCE;
   const TargetRegisterInfo* RI;
   MachineModuleInfo* MMI;
   JIT& Jit;
@@ -66,13 +66,13 @@ public:
   JITDwarfEmitter(JIT& jit);
   
   unsigned char* EmitDwarfTable(MachineFunction& F, 
-                                MachineCodeEmitter& MCE,
+                                JITCodeEmitter& JCE,
                                 unsigned char* StartFunction,
                                 unsigned char* EndFunction);
   
   
   unsigned GetDwarfTableSizeInBytes(MachineFunction& F, 
-                                    MachineCodeEmitter& MCE,
+                                    JITCodeEmitter& JCE,
                                     unsigned char* StartFunction,
                                     unsigned char* EndFunction);
 
diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp
index fe1d96ad19..89131a0dde 100644
--- a/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -18,7 +18,7 @@
 #include "llvm/Constants.h"
 #include "llvm/Module.h"
 #include "llvm/DerivedTypes.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
@@ -546,7 +546,7 @@ static void RemoveFunctionFromSymbolTable(void *FnStart) {
 namespace {
   /// JITEmitter - The JIT implementation of the MachineCodeEmitter, which is
   /// used to output functions to memory for execution.
-  class JITEmitter : public MachineCodeEmitter {
+  class JITEmitter : public JITCodeEmitter {
     JITMemoryManager *MemMgr;
 
     // When outputting a function stub in the context of some other function, we
@@ -1289,7 +1289,7 @@ void JITEmitter::deallocateMemForFunction(Function *F) {
 
 void* JITEmitter::allocateSpace(uintptr_t Size, unsigned Alignment) {
   if (BufferBegin)
-    return MachineCodeEmitter::allocateSpace(Size, Alignment);
+    return JITCodeEmitter::allocateSpace(Size, Alignment);
 
   // create a new memory block if there is no active one.
   // care must be taken so that BufferBegin is invalidated when a
@@ -1460,7 +1460,7 @@ uintptr_t JITEmitter::getJumpTableEntryAddress(unsigned Index) const {
 //  Public interface to this file
 //===----------------------------------------------------------------------===//
 
-MachineCodeEmitter *JIT::createEmitter(JIT &jit, JITMemoryManager *JMM) {
+JITCodeEmitter *JIT::createEmitter(JIT &jit, JITMemoryManager *JMM) {
   return new JITEmitter(jit, JMM);
 }
 
@@ -1487,13 +1487,13 @@ void *JIT::getPointerToFunctionOrStub(Function *F) {
     return Addr;
   
   // Get a stub if the target supports it.
-  assert(isa<JITEmitter>(MCE) && "Unexpected MCE?");
+  assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
   JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
   return JE->getJITResolver().getFunctionStub(F);
 }
 
 void JIT::registerMachineCodeInfo(MachineCodeInfo *mc) {
-  assert(isa<JITEmitter>(MCE) && "Unexpected MCE?");
+  assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
   JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
 
   JE->setMachineCodeInfo(mc);
@@ -1501,7 +1501,7 @@ void JIT::registerMachineCodeInfo(MachineCodeInfo *mc) {
 
 void JIT::updateFunctionStub(Function *F) {
   // Get the empty stub we generated earlier.
-  assert(isa<JITEmitter>(MCE) && "Unexpected MCE?");
+  assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
   JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
   void *Stub = JE->getJITResolver().getFunctionStub(F);
 
@@ -1515,7 +1515,7 @@ void JIT::updateFunctionStub(Function *F) {
 /// that were emitted during code generation.
 ///
 void JIT::updateDlsymStubTable() {
-  assert(isa<JITEmitter>(MCE) && "Unexpected MCE?");
+  assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
   JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
   
   SmallVector<GlobalValue*, 8> GVs;
@@ -1553,11 +1553,11 @@ void JIT::updateDlsymStubTable() {
   JE->startGVStub(0, offset, 4);
   
   // Emit the number of records
-  MCE->emitInt32(nStubs);
+  JE->emitInt32(nStubs);
   
   // Emit the string offsets
   for (unsigned i = 0; i != nStubs; ++i)
-    MCE->emitInt32(Offsets[i]);
+    JE->emitInt32(Offsets[i]);
   
   // Emit the pointers.  Verify that they are at least 2-byte aligned, and set
   // the low bit to 0 == GV, 1 == Function, so that the client code doing the
@@ -1571,26 +1571,26 @@ void JIT::updateDlsymStubTable() {
       Ptr |= (intptr_t)1;
            
     if (sizeof(Ptr) == 8)
-      MCE->emitInt64(Ptr);
+      JE->emitInt64(Ptr);
     else
-      MCE->emitInt32(Ptr);
+      JE->emitInt32(Ptr);
   }
   for (StringMapConstIterator<void*> i = ExtFns.begin(), e = ExtFns.end(); 
        i != e; ++i) {
     intptr_t Ptr = (intptr_t)i->second | 1;
 
     if (sizeof(Ptr) == 8)
-      MCE->emitInt64(Ptr);
+      JE->emitInt64(Ptr);
     else
-      MCE->emitInt32(Ptr);
+      JE->emitInt32(Ptr);
   }
   
   // Emit the strings.
   for (unsigned i = 0; i != GVs.size(); ++i)
-    MCE->emitString(GVs[i]->getName());
+    JE->emitString(GVs[i]->getName());
   for (StringMapConstIterator<void*> i = ExtFns.begin(), e = ExtFns.end(); 
        i != e; ++i)
-    MCE->emitString(i->first());
+    JE->emitString(i->first());
   
   // Tell the JIT memory manager where it is.  The JIT Memory Manager will
   // deallocate space for the old one, if one existed.
@@ -1609,7 +1609,7 @@ void JIT::freeMachineCodeForFunction(Function *F) {
     RemoveFunctionFromSymbolTable(OldPtr);
 
   // Free the actual memory for the function body and related stuff.
-  assert(isa<JITEmitter>(MCE) && "Unexpected MCE?");
-  cast<JITEmitter>(MCE)->deallocateMemForFunction(F);
+  assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
+  cast<JITEmitter>(JCE)->deallocateMemForFunction(F);
 }
 
diff --git a/lib/Target/ARM/ARM.h b/lib/Target/ARM/ARM.h
index b275d2a8d8..c582d684bf 100644
--- a/lib/Target/ARM/ARM.h
+++ b/lib/Target/ARM/ARM.h
@@ -23,6 +23,7 @@ namespace llvm {
 class ARMTargetMachine;
 class FunctionPass;
 class MachineCodeEmitter;
+class JITCodeEmitter;
 class raw_ostream;
 
 // Enums corresponding to ARM condition codes
@@ -96,6 +97,17 @@ FunctionPass *createARMCodePrinterPass(raw_ostream &O,
                                        bool Verbose);
 FunctionPass *createARMCodeEmitterPass(ARMTargetMachine &TM,
                                        MachineCodeEmitter &MCE);
+
+FunctionPass *createARMCodeEmitterPass(
+    ARMTargetMachine &TM, MachineCodeEmitter &MCE);
+/*
+template< class machineCodeEmitter>
+FunctionPass *createARMCodeEmitterPass(
+    ARMTargetMachine &TM, machineCodeEmitter &MCE);
+*/
+FunctionPass *createARMJITCodeEmitterPass(
+    ARMTargetMachine &TM, JITCodeEmitter &JCE);
+
 FunctionPass *createARMLoadStoreOptimizationPass();
 FunctionPass *createARMConstantIslandPass();
 
diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index c27fc5f1ea..70b5d788b4 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -25,6 +25,7 @@
 #include "llvm/Function.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
@@ -41,23 +42,37 @@ using namespace llvm;
 STATISTIC(NumEmitted, "Number of machine instructions emitted");
 
 namespace {
-  class VISIBILITY_HIDDEN ARMCodeEmitter : public MachineFunctionPass {
+
+  class ARMCodeEmitter {
+  public:
+
+    /// getBinaryCodeForInstr - This function, generated by the
+    /// CodeEmitterGenerator using TableGen, produces the binary encoding for
+    /// machine instructions.
+
+    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
+  };
+
+  template< class machineCodeEmitter>	
+  class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass, 
+    	public ARMCodeEmitter
+  {
     ARMJITInfo                *JTI;
     const ARMInstrInfo        *II;
     const TargetData          *TD;
     TargetMachine             &TM;
-    MachineCodeEmitter        &MCE;
+    machineCodeEmitter        &MCE;
     const std::vector<MachineConstantPoolEntry> *MCPEs;
     const std::vector<MachineJumpTableEntry> *MJTEs;
     bool IsPIC;
 
   public:
     static char ID;
-    explicit ARMCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce)
+    explicit Emitter(TargetMachine &tm, machineCodeEmitter &mce)
       : MachineFunctionPass(&ID), JTI(0), II(0), TD(0), TM(tm),
       MCE(mce), MCPEs(0), MJTEs(0),
       IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
-    ARMCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce,
+    Emitter(TargetMachine &tm, machineCodeEmitter &mce,
             const ARMInstrInfo &ii, const TargetData &td)
       : MachineFunctionPass(&ID), JTI(0), II(&ii), TD(&td), TM(tm),
       MCE(mce), MCPEs(0), MJTEs(0),
@@ -134,12 +149,6 @@ namespace {
 
     void emitMiscInstruction(const MachineInstr &MI);
 
-    /// getBinaryCodeForInstr - This function, generated by the
-    /// CodeEmitterGenerator using TableGen, produces the binary encoding for
-    /// machine instructions.
-    ///
-    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
-
     /// getMachineOpValue - Return binary encoding of operand. If the machine
     /// operand requires relocation, record the relocation and return zero.
     unsigned getMachineOpValue(const MachineInstr &MI,const MachineOperand &MO);
@@ -161,17 +170,30 @@ namespace {
     void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
                                intptr_t JTBase = 0);
   };
-  char ARMCodeEmitter::ID = 0;
+  template <class machineCodeEmitter>
+  char Emitter<machineCodeEmitter>::ID = 0;
 }
 
 /// createARMCodeEmitterPass - Return a pass that emits the collected ARM code
 /// to the specified MCE object.
-FunctionPass *llvm::createARMCodeEmitterPass(ARMTargetMachine &TM,
-                                             MachineCodeEmitter &MCE) {
-  return new ARMCodeEmitter(TM, MCE);
+
+namespace llvm {
+	
+FunctionPass *createARMCodeEmitterPass(
+    ARMTargetMachine &TM, MachineCodeEmitter &MCE)
+{
+  return new Emitter<MachineCodeEmitter>(TM, MCE);
+}
+FunctionPass *createARMJITCodeEmitterPass(
+    ARMTargetMachine &TM, JITCodeEmitter &JCE)
+{
+  return new Emitter<JITCodeEmitter>(TM, JCE);
 }
 
-bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
+} // end namespace llvm
+
+template< class machineCodeEmitter>
+bool Emitter< machineCodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
   assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
           MF.getTarget().getRelocationModel() != Reloc::Static) &&
          "JIT relocation model must be set to static or default!");
@@ -200,7 +222,8 @@ bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
 
 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
 ///
-unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
+template< class machineCodeEmitter>
+unsigned Emitter< machineCodeEmitter>::getShiftOp(unsigned Imm) const {
   switch (ARM_AM::getAM2ShiftOpc(Imm)) {
   default: assert(0 && "Unknown shift opc!");
   case ARM_AM::asr: return 2;
@@ -214,7 +237,8 @@ unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
 
 /// getMachineOpValue - Return binary encoding of operand. If the machine
 /// operand requires relocation, record the relocation and return zero.
-unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
+template< class machineCodeEmitter>
+unsigned Emitter< machineCodeEmitter>::getMachineOpValue(const MachineInstr &MI,
                                            const MachineOperand &MO) {
   if (MO.isReg())
     return ARMRegisterInfo::getRegisterNumbering(MO.getReg());
@@ -243,7 +267,8 @@ unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
 
 /// emitGlobalAddress - Emit the specified address to the code stream.
 ///
-void ARMCodeEmitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
                                        bool NeedStub, intptr_t ACPV) {
   MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(),
                                              Reloc, GV, ACPV, NeedStub));
@@ -252,7 +277,8 @@ void ARMCodeEmitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
 /// be emitted to the current location in the function, and allow it to be PC
 /// relative.
-void ARMCodeEmitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
   MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
                                                  Reloc, ES));
 }
@@ -260,7 +286,8 @@ void ARMCodeEmitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
 /// emitConstPoolAddress - Arrange for the address of an constant pool
 /// to be emitted to the current location in the function, and allow it to be PC
 /// relative.
-void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
   // Tell JIT emitter we'll resolve the address.
   MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
                                                     Reloc, CPI, 0, true));
@@ -269,19 +296,22 @@ void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
 /// emitJumpTableAddress - Arrange for the address of a jump table to
 /// be emitted to the current location in the function, and allow it to be PC
 /// relative.
-void ARMCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) {
   MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
                                                     Reloc, JTIndex, 0, true));
 }
 
 /// emitMachineBasicBlock - Emit the specified address basic block.
-void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMachineBasicBlock(MachineBasicBlock *BB,
                                            unsigned Reloc, intptr_t JTBase) {
   MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
                                              Reloc, BB, JTBase));
 }
 
-void ARMCodeEmitter::emitWordLE(unsigned Binary) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitWordLE(unsigned Binary) {
 #ifndef NDEBUG
   DOUT << "  0x" << std::hex << std::setw(8) << std::setfill('0')
        << Binary << std::dec << "\n";
@@ -289,7 +319,8 @@ void ARMCodeEmitter::emitWordLE(unsigned Binary) {
   MCE.emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitDWordLE(uint64_t Binary) {
 #ifndef NDEBUG
   DOUT << "  0x" << std::hex << std::setw(8) << std::setfill('0')
        << (unsigned)Binary << std::dec << "\n";
@@ -299,7 +330,8 @@ void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
   MCE.emitDWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitInstruction(const MachineInstr &MI) {
   DOUT << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI;
 
   NumEmitted++;  // Keep track of the # of mi's emitted
@@ -365,7 +397,8 @@ void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
   }
 }
 
-void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitConstPoolInstruction(const MachineInstr &MI) {
   unsigned CPI = MI.getOperand(0).getImm();       // CP instruction index.
   unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
   const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
@@ -432,7 +465,8 @@ void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
   }
 }
 
-void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMOVi2piecesInstruction(const MachineInstr &MI) {
   const MachineOperand &MO0 = MI.getOperand(0);
   const MachineOperand &MO1 = MI.getOperand(1);
   assert(MO1.isImm() && "Not a valid so_imm value!");
@@ -473,7 +507,8 @@ void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitLEApcrelJTInstruction(const MachineInstr &MI) {
   // It's basically add r, pc, (LJTI - $+8)
   
   const TargetInstrDesc &TID = MI.getDesc();
@@ -501,7 +536,8 @@ void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitPseudoMoveInstruction(const MachineInstr &MI) {
   unsigned Opcode = MI.getDesc().Opcode;
 
   // Part of binary is determined by TableGn.
@@ -540,13 +576,15 @@ void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::addPCLabel(unsigned LabelID) {
   DOUT << "  ** LPC" << LabelID << " @ "
        << (void*)MCE.getCurrentPCValue() << '\n';
   JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
 }
 
-void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitPseudoInstruction(const MachineInstr &MI) {
   unsigned Opcode = MI.getDesc().Opcode;
   switch (Opcode) {
   default:
@@ -615,8 +653,8 @@ void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
   }
 }
 
-
-unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
+template< class machineCodeEmitter>
+unsigned Emitter< machineCodeEmitter>::getMachineSoRegOpValue(const MachineInstr &MI,
                                                 const TargetInstrDesc &TID,
                                                 const MachineOperand &MO,
                                                 unsigned OpIdx) {
@@ -674,7 +712,8 @@ unsigned ARMCodeEmitter::getMachineSoRegOpValue(const MachineInstr &MI,
   return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
 }
 
-unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
+template< class machineCodeEmitter>
+unsigned Emitter< machineCodeEmitter>::getMachineSoImmOpValue(unsigned SoImm) {
   // Encode rotate_imm.
   unsigned Binary = (ARM_AM::getSOImmValRot(SoImm) >> 1)
     << ARMII::SoRotImmShift;
@@ -684,7 +723,8 @@ unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
   return Binary;
 }
 
-unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
+template< class machineCodeEmitter>
+unsigned Emitter< machineCodeEmitter>::getAddrModeSBit(const MachineInstr &MI,
                                          const TargetInstrDesc &TID) const {
   for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
     const MachineOperand &MO = MI.getOperand(i-1);
@@ -694,7 +734,8 @@ unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
   return 0;
 }
 
-void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitDataProcessingInstruction(const MachineInstr &MI,
                                                    unsigned ImplicitRd,
                                                    unsigned ImplicitRn) {
   const TargetInstrDesc &TID = MI.getDesc();
@@ -757,7 +798,8 @@ void ARMCodeEmitter::emitDataProcessingInstruction(const MachineInstr &MI,
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitLoadStoreInstruction(const MachineInstr &MI,
                                               unsigned ImplicitRd,
                                               unsigned ImplicitRn) {
   const TargetInstrDesc &TID = MI.getDesc();
@@ -831,7 +873,8 @@ void ARMCodeEmitter::emitLoadStoreInstruction(const MachineInstr &MI,
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMiscLoadStoreInstruction(const MachineInstr &MI,
                                                   unsigned ImplicitRn) {
   const TargetInstrDesc &TID = MI.getDesc();
   unsigned Form = TID.TSFlags & ARMII::FormMask;
@@ -914,7 +957,8 @@ static unsigned getAddrModeUPBits(unsigned Mode) {
   return Binary;
 }
 
-void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
   // Part of binary is determined by TableGn.
   unsigned Binary = getBinaryCodeForInstr(MI);
 
@@ -946,7 +990,8 @@ void ARMCodeEmitter::emitLoadStoreMultipleInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMulFrmInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
 
   // Part of binary is determined by TableGn.
@@ -983,7 +1028,8 @@ void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitExtendInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
 
   // Part of binary is determined by TableGn.
@@ -1020,7 +1066,8 @@ void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMiscArithInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
 
   // Part of binary is determined by TableGn.
@@ -1058,7 +1105,8 @@ void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitBranchInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
 
   if (TID.Opcode == ARM::TPsoft)
@@ -1076,7 +1124,8 @@ void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitInlineJumpTable(unsigned JTIndex) {
   // Remember the base address of the inline jump table.
   uintptr_t JTBase = MCE.getCurrentPCValue();
   JTI->addJumpTableBaseAddr(JTIndex, JTBase);
@@ -1095,7 +1144,8 @@ void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
   }
 }
 
-void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMiscBranchInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
 
   // Handle jump tables.
@@ -1175,7 +1225,8 @@ static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
   return Binary;
 }
 
-void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitVFPArithInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
 
   // Part of binary is determined by TableGn.
@@ -1214,7 +1265,8 @@ void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitVFPConversionInstruction(const MachineInstr &MI) {
   const TargetInstrDesc &TID = MI.getDesc();
   unsigned Form = TID.TSFlags & ARMII::FormMask;
 
@@ -1270,7 +1322,8 @@ void ARMCodeEmitter::emitVFPConversionInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
   // Part of binary is determined by TableGn.
   unsigned Binary = getBinaryCodeForInstr(MI);
 
@@ -1304,8 +1357,8 @@ void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void
-ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
   // Part of binary is determined by TableGn.
   unsigned Binary = getBinaryCodeForInstr(MI);
 
@@ -1339,7 +1392,8 @@ ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
-void ARMCodeEmitter::emitMiscInstruction(const MachineInstr &MI) {
+template< class machineCodeEmitter>
+void Emitter< machineCodeEmitter>::emitMiscInstruction(const MachineInstr &MI) {
   // Part of binary is determined by TableGn.
   unsigned Binary = getBinaryCodeForInstr(MI);
 
@@ -1350,3 +1404,4 @@ void ARMCodeEmitter::emitMiscInstruction(const MachineInstr &MI) {
 }
 
 #include "ARMGenCodeEmitter.inc"
+
diff --git a/lib/Target/ARM/ARMJITInfo.cpp b/lib/Target/ARM/ARMJITInfo.cpp
index eda0c93366..e551c41936 100644
--- a/lib/Target/ARM/ARMJITInfo.cpp
+++ b/lib/Target/ARM/ARMJITInfo.cpp
@@ -18,7 +18,7 @@
 #include "ARMRelocations.h"
 #include "ARMSubtarget.h"
 #include "llvm/Function.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/Config/alloca.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Streams.h"
@@ -141,16 +141,16 @@ ARMJITInfo::getLazyResolverFunction(JITCompilerFn F) {
 }
 
 void *ARMJITInfo::emitGlobalValueIndirectSym(const GlobalValue *GV, void *Ptr,
-                                             MachineCodeEmitter &MCE) {
-  MCE.startGVStub(GV, 4, 4);
-  MCE.emitWordLE((intptr_t)Ptr);
-  void *PtrAddr = MCE.finishGVStub(GV);
+                                             JITCodeEmitter &JCE) {
+  JCE.startGVStub(GV, 4, 4);
+  JCE.emitWordLE((intptr_t)Ptr);
+  void *PtrAddr = JCE.finishGVStub(GV);
   addIndirectSymAddr(Ptr, (intptr_t)PtrAddr);
   return PtrAddr;
 }
 
 void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE) {
+                                   JITCodeEmitter &JCE) {
   // If this is just a call to an external function, emit a branch instead of a
   // call.  The code is the same except for one bit of the last instruction.
   if (Fn != (void*)(intptr_t)ARMCompilationCallback) {
@@ -160,7 +160,7 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
       intptr_t LazyPtr = getIndirectSymAddr(Fn);
       if (!LazyPtr) {
         // In PIC mode, the function stub is loading a lazy-ptr.
-        LazyPtr= (intptr_t)emitGlobalValueIndirectSym((GlobalValue*)F, Fn, MCE);
+        LazyPtr= (intptr_t)emitGlobalValueIndirectSym((GlobalValue*)F, Fn, JCE);
         if (F)
           DOUT << "JIT: Indirect symbol emitted at [" << LazyPtr << "] for GV '"
                << F->getName() << "'\n";
@@ -168,19 +168,19 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
           DOUT << "JIT: Stub emitted at [" << LazyPtr
                << "] for external function at '" << Fn << "'\n";
       }
-      MCE.startGVStub(F, 16, 4);
-      intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
-      MCE.emitWordLE(0xe59fc004);            // ldr pc, [pc, #+4]
-      MCE.emitWordLE(0xe08fc00c);            // L_func$scv: add ip, pc, ip
-      MCE.emitWordLE(0xe59cf000);            // ldr pc, [ip]
-      MCE.emitWordLE(LazyPtr - (Addr+4+8));  // func - (L_func$scv+8)
+      JCE.startGVStub(F, 16, 4);
+      intptr_t Addr = (intptr_t)JCE.getCurrentPCValue();
+      JCE.emitWordLE(0xe59fc004);            // ldr pc, [pc, #+4]
+      JCE.emitWordLE(0xe08fc00c);            // L_func$scv: add ip, pc, ip
+      JCE.emitWordLE(0xe59cf000);            // ldr pc, [ip]
+      JCE.emitWordLE(LazyPtr - (Addr+4+8));  // func - (L_func$scv+8)
       sys::Memory::InvalidateInstructionCache((void*)Addr, 16);
     } else {
       // The stub is 8-byte size and 4-aligned.
-      MCE.startGVStub(F, 8, 4);
-      intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
-      MCE.emitWordLE(0xe51ff004);    // ldr pc, [pc, #-4]
-      MCE.emitWordLE((intptr_t)Fn);  // addr of function
+      JCE.startGVStub(F, 8, 4);
+      intptr_t Addr = (intptr_t)JCE.getCurrentPCValue();
+      JCE.emitWordLE(0xe51ff004);    // ldr pc, [pc, #-4]
+      JCE.emitWordLE((intptr_t)Fn);  // addr of function
       sys::Memory::InvalidateInstructionCache((void*)Addr, 8);
     }
   } else {
@@ -191,22 +191,22 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
     //
     // Branch and link to the compilation callback.
     // The stub is 16-byte size and 4-byte aligned.
-    MCE.startGVStub(F, 16, 4);
-    intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
+    JCE.startGVStub(F, 16, 4);
+    intptr_t Addr = (intptr_t)JCE.getCurrentPCValue();
     // Save LR so the callback can determine which stub called it.
     // The compilation callback is responsible for popping this prior
     // to returning.
-    MCE.emitWordLE(0xe92d4000); // push {lr}
+    JCE.emitWordLE(0xe92d4000); // push {lr}
     // Set the return address to go back to the start of this stub.
-    MCE.emitWordLE(0xe24fe00c); // sub lr, pc, #12
+    JCE.emitWordLE(0xe24fe00c); // sub lr, pc, #12
     // Invoke the compilation callback.
-    MCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4]
+    JCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4]
     // The address of the compilation callback.
-    MCE.emitWordLE((intptr_t)ARMCompilationCallback);
+    JCE.emitWordLE((intptr_t)ARMCompilationCallback);
     sys::Memory::InvalidateInstructionCache((void*)Addr, 16);
   }
 
-  return MCE.finishGVStub(F);
+  return JCE.finishGVStub(F);
 }
 
 intptr_t ARMJITInfo::resolveRelocDestAddr(MachineRelocation *MR) const {
diff --git a/lib/Target/ARM/ARMJITInfo.h b/lib/Target/ARM/ARMJITInfo.h
index 8bcaa4c066..7dfeed8b7b 100644
--- a/lib/Target/ARM/ARMJITInfo.h
+++ b/lib/Target/ARM/ARMJITInfo.h
@@ -55,17 +55,17 @@ namespace llvm {
     ///
     virtual void replaceMachineCodeForFunction(void *Old, void *New);
 
-    /// emitGlobalValueIndirectSym - Use the specified MachineCodeEmitter object
+    /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
     /// to emit an indirect symbol which contains the address of the specified
     /// ptr.
     virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
-                                            MachineCodeEmitter &MCE);
+                                            JITCodeEmitter &JCE);
 
-    /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
+    /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
     /// small native function that simply calls the function at the specified
     /// address.
     virtual void *emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE);
+                                   JITCodeEmitter &JCE);
 
     /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
     virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
@@ -86,7 +86,7 @@ namespace llvm {
 
     /// allocateSeparateGVMemory - If true, globals should be placed in
     /// separately allocated heap memory rather than in the same
-    /// code memory allocated by MachineCodeEmitter.
+    /// code memory allocated by JITCodeEmitter.
     virtual bool allocateSeparateGVMemory() const {
 #ifdef __APPLE__
       return true;
diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index a5ce86e9df..1dc7d19aa1 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -190,6 +190,25 @@ bool ARMTargetMachine::addCodeEmitter(PassManagerBase &PM,
   return false;
 }
 
+bool ARMTargetMachine::addCodeEmitter(PassManagerBase &PM,
+                                      CodeGenOpt::Level OptLevel,
+                                      bool DumpAsm,
+                                      JITCodeEmitter &JCE) {
+  // FIXME: Move this to TargetJITInfo!
+  if (DefRelocModel == Reloc::Default)
+    setRelocationModel(Reloc::Static);
+
+  // Machine code emitter pass for ARM.
+  PM.add(createARMJITCodeEmitterPass(*this, JCE));
+  if (DumpAsm) {
+    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
+    if (AsmPrinterCtor)
+      PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
+  }
+
+  return false;
+}
+
 bool ARMTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
                                             CodeGenOpt::Level OptLevel,
                                             bool DumpAsm,
@@ -204,3 +223,20 @@ bool ARMTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 
   return false;
 }
+
+bool ARMTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
+                                            CodeGenOpt::Level OptLevel,
+                                            bool DumpAsm,
+                                            JITCodeEmitter &JCE) {
+  // Machine code emitter pass for ARM.
+  PM.add(createARMJITCodeEmitterPass(*this, JCE));
+  if (DumpAsm) {
+    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
+    if (AsmPrinterCtor)
+      PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
+  }
+
+  return false;
+}
+
+
diff --git a/lib/Target/ARM/ARMTargetMachine.h b/lib/Target/ARM/ARMTargetMachine.h
index 3f65f71bbe..916a8aa9e9 100644
--- a/lib/Target/ARM/ARMTargetMachine.h
+++ b/lib/Target/ARM/ARMTargetMachine.h
@@ -77,10 +77,16 @@ public:
                                   bool Verbose, raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
                               bool DumpAsm, MachineCodeEmitter &MCE);
+  virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
+                              bool DumpAsm, JITCodeEmitter &MCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
                                     CodeGenOpt::Level OptLevel,
                                     bool DumpAsm,
                                     MachineCodeEmitter &MCE);
+  virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
+                                    CodeGenOpt::Level OptLevel,
+                                    bool DumpAsm,
+                                    JITCodeEmitter &MCE);
 };
 
 /// ThumbTargetMachine - Thumb target machine.
diff --git a/lib/Target/Alpha/Alpha.h b/lib/Target/Alpha/Alpha.h
index 853109ae34..2815176149 100644
--- a/lib/Target/Alpha/Alpha.h
+++ b/lib/Target/Alpha/Alpha.h
@@ -32,6 +32,8 @@ namespace llvm {
   FunctionPass *createAlphaPatternInstructionSelector(TargetMachine &TM);
   FunctionPass *createAlphaCodeEmitterPass(AlphaTargetMachine &TM,
                                            MachineCodeEmitter &MCE);
+  FunctionPass *createAlphaJITCodeEmitterPass(AlphaTargetMachine &TM,
+                                           JITCodeEmitter &JCE);
   FunctionPass *createAlphaLLRPPass(AlphaTargetMachine &tm);
   FunctionPass *createAlphaBranchSelectionPass();
 
diff --git a/lib/Target/Alpha/AlphaCodeEmitter.cpp b/lib/Target/Alpha/AlphaCodeEmitter.cpp
index 0d441146b8..ab3682bc9c 100644
--- a/lib/Target/Alpha/AlphaCodeEmitter.cpp
+++ b/lib/Target/Alpha/AlphaCodeEmitter.cpp
@@ -18,31 +18,50 @@
 #include "Alpha.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Function.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 using namespace llvm;
 
 namespace {
-  class AlphaCodeEmitter : public MachineFunctionPass {
-    const AlphaInstrInfo  *II;
-    TargetMachine &TM;
-    MachineCodeEmitter  &MCE;
+  	
+  class AlphaCodeEmitter {
+    MachineCodeEmitter &MCE;
+  public:
+    AlphaCodeEmitter( MachineCodeEmitter &mce) : MCE(mce) {}
+
+    /// getBinaryCodeForInstr - This function, generated by the
+    /// CodeEmitterGenerator using TableGen, produces the binary encoding for
+    /// machine instructions.
+
+    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
 
     /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
-    ///
-    unsigned getMachineOpValue(const MachineInstr &MI,
-                               const MachineOperand &MO);
+
+    unsigned getMachineOpValue(const MachineInstr &MI, const MachineOperand &MO);
+  };
+
+  template <class machineCodeEmitter>
+  class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass,
+      public AlphaCodeEmitter
+  {
+    const AlphaInstrInfo  *II;
+    TargetMachine &TM;
+    machineCodeEmitter  &MCE;
 
   public:
     static char ID;
-    explicit AlphaCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce)
-      : MachineFunctionPass(&ID), II(0), TM(tm), MCE(mce) {}
-    AlphaCodeEmitter(TargetMachine &tm, MachineCodeEmitter &mce,
+    explicit Emitter(TargetMachine &tm, machineCodeEmitter &mce)
+      : MachineFunctionPass(&ID), AlphaCodeEmitter( mce),
+        II(0), TM(tm), MCE(mce) {}
+    Emitter(TargetMachine &tm, machineCodeEmitter &mce,
                      const AlphaInstrInfo& ii)
-      : MachineFunctionPass(&ID), II(&ii), TM(tm), MCE(mce) {}
+      : MachineFunctionPass(&ID), AlphaCodeEmitter( mce),
+        II(&ii), TM(tm), MCE(mce) {}
 
     bool runOnMachineFunction(MachineFunction &MF);
 
@@ -52,27 +71,29 @@ namespace {
 
     void emitInstruction(const MachineInstr &MI);
 
-    /// getBinaryCodeForInstr - This function, generated by the
-    /// CodeEmitterGenerator using TableGen, produces the binary encoding for
-    /// machine instructions.
-    ///
-    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
-
   private:
     void emitBasicBlock(MachineBasicBlock &MBB);
-
   };
-  char AlphaCodeEmitter::ID = 0;
+
+  template <class machineCodeEmitter>
+    char Emitter<machineCodeEmitter>::ID = 0;
 }
 
 /// createAlphaCodeEmitterPass - Return a pass that emits the collected Alpha code
 /// to the specified MCE object.
-FunctionPass *llvm::createAlphaCodeEmitterPass(AlphaTargetMachine &TM,
+
+FunctionPass *llvm::createAlphaCodeEmitterPass( AlphaTargetMachine &TM,
                                                MachineCodeEmitter &MCE) {
-  return new AlphaCodeEmitter(TM, MCE);
+  return new Emitter<MachineCodeEmitter>(TM, MCE);
+}
+
+FunctionPass *llvm::createAlphaJITCodeEmitterPass( AlphaTargetMachine &TM,
+                                               JITCodeEmitter &JCE) {
+  return new Emitter<JITCodeEmitter>(TM, JCE);
 }
 
-bool AlphaCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
+template <class machineCodeEmitter>
+bool Emitter<machineCodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
   II = ((AlphaTargetMachine&)MF.getTarget()).getInstrInfo();
 
   do {
@@ -84,7 +105,8 @@ bool AlphaCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
   return false;
 }
 
-void AlphaCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
+template <class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitBasicBlock(MachineBasicBlock &MBB) {
   MCE.StartMachineBasicBlock(&MBB);
   for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
        I != E; ++I) {
@@ -143,7 +165,7 @@ static unsigned getAlphaRegNumber(unsigned Reg) {
 }
 
 unsigned AlphaCodeEmitter::getMachineOpValue(const MachineInstr &MI,
-                                             const MachineOperand &MO) {
+                           		     const MachineOperand &MO) {
 
   unsigned rv = 0; // Return value; defaults to 0 for unhandled cases
                    // or things that get fixed up later by the JIT.
@@ -215,6 +237,6 @@ unsigned AlphaCodeEmitter::getMachineOpValue(const MachineInstr &MI,
   return rv;
 }
 
-
 #include "AlphaGenCodeEmitter.inc"
 
+
diff --git a/lib/Target/Alpha/AlphaJITInfo.cpp b/lib/Target/Alpha/AlphaJITInfo.cpp
index 8f36c1ff0c..3fecb19d73 100644
--- a/lib/Target/Alpha/AlphaJITInfo.cpp
+++ b/lib/Target/Alpha/AlphaJITInfo.cpp
@@ -15,7 +15,7 @@
 #include "AlphaJITInfo.h"
 #include "AlphaRelocations.h"
 #include "llvm/Function.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/Config/alloca.h"
 #include "llvm/Support/Debug.h"
 #include <cstdlib>
@@ -192,16 +192,16 @@ extern "C" {
 }
 
 void *AlphaJITInfo::emitFunctionStub(const Function* F, void *Fn,
-                                     MachineCodeEmitter &MCE) {
+                                     JITCodeEmitter &JCE) {
   //assert(Fn == AlphaCompilationCallback && "Where are you going?\n");
   //Do things in a stupid slow way!
-  MCE.startGVStub(F, 19*4);
-  void* Addr = (void*)(intptr_t)MCE.getCurrentPCValue();
+  JCE.startGVStub(F, 19*4);
+  void* Addr = (void*)(intptr_t)JCE.getCurrentPCValue();
   for (int x = 0; x < 19; ++ x)
-    MCE.emitWordLE(0);
+    JCE.emitWordLE(0);
   EmitBranchToAt(Addr, Fn);
   DOUT << "Emitting Stub to " << Fn << " at [" << Addr << "]\n";
-  return MCE.finishGVStub(F);
+  return JCE.finishGVStub(F);
 }
 
 TargetJITInfo::LazyResolverFn
diff --git a/lib/Target/Alpha/AlphaJITInfo.h b/lib/Target/Alpha/AlphaJITInfo.h
index c9b4a8eaaa..edff990dbc 100644
--- a/lib/Target/Alpha/AlphaJITInfo.h
+++ b/lib/Target/Alpha/AlphaJITInfo.h
@@ -27,7 +27,7 @@ namespace llvm {
     { useGOT = true; }
 
     virtual void *emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE);
+                                   JITCodeEmitter &JCE);
     virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
     virtual void relocate(void *Function, MachineRelocation *MR,
                           unsigned NumRelocs, unsigned char* GOTBase);
diff --git a/lib/Target/Alpha/AlphaTargetMachine.cpp b/lib/Target/Alpha/AlphaTargetMachine.cpp
index 802a803670..4c830541f1 100644
--- a/lib/Target/Alpha/AlphaTargetMachine.cpp
+++ b/lib/Target/Alpha/AlphaTargetMachine.cpp
@@ -103,9 +103,24 @@ bool AlphaTargetMachine::addCodeEmitter(PassManagerBase &PM,
     PM.add(createAlphaCodePrinterPass(errs(), *this, OptLevel, true));
   return false;
 }
+bool AlphaTargetMachine::addCodeEmitter(PassManagerBase &PM,
+                                        CodeGenOpt::Level OptLevel,
+                                        bool DumpAsm, JITCodeEmitter &JCE) {
+  PM.add(createAlphaJITCodeEmitterPass(*this, JCE));
+  if (DumpAsm)
+    PM.add(createAlphaCodePrinterPass(errs(), *this, OptLevel, true));
+  return false;
+}
 bool AlphaTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
                                               CodeGenOpt::Level OptLevel,
                                               bool DumpAsm,
                                               MachineCodeEmitter &MCE) {
   return addCodeEmitter(PM, OptLevel, DumpAsm, MCE);
 }
+bool AlphaTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
+                                              CodeGenOpt::Level OptLevel,
+                                              bool DumpAsm,
+                                              JITCodeEmitter &JCE) {
+  return addCodeEmitter(PM, OptLevel, DumpAsm, JCE);
+}
+
diff --git a/lib/Target/Alpha/AlphaTargetMachine.h b/lib/Target/Alpha/AlphaTargetMachine.h
index 8dd07db062..51224e80de 100644
--- a/lib/Target/Alpha/AlphaTargetMachine.h
+++ b/lib/Target/Alpha/AlphaTargetMachine.h
@@ -65,10 +65,16 @@ public:
                                   bool Verbose, raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
                               bool DumpAsm, MachineCodeEmitter &MCE);
+  virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
+                              bool DumpAsm, JITCodeEmitter &JCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
                                     CodeGenOpt::Level OptLevel,
                                     bool DumpAsm,
                                     MachineCodeEmitter &MCE);
+  virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
+                                    CodeGenOpt::Level OptLevel,
+                                    bool DumpAsm,
+                                    JITCodeEmitter &JCE);
 };
 
 } // end namespace llvm
diff --git a/lib/Target/PowerPC/PPC.h b/lib/Target/PowerPC/PPC.h
index 78c970eab4..c844e21990 100644
--- a/lib/Target/PowerPC/PPC.h
+++ b/lib/Target/PowerPC/PPC.h
@@ -33,6 +33,8 @@ FunctionPass *createPPCAsmPrinterPass(raw_ostream &OS,
                                       CodeGenOpt::Level OptLevel, bool Verbose);
 FunctionPass *createPPCCodeEmitterPass(PPCTargetMachine &TM,
                                        MachineCodeEmitter &MCE);
+FunctionPass *createPPCJITCodeEmitterPass(PPCTargetMachine &TM,
+                                       JITCodeEmitter &MCE);
 } // end namespace llvm;
 
 // Defines symbolic names for PowerPC registers.  This defines a mapping from
diff --git a/lib/Target/PowerPC/PPCCodeEmitter.cpp b/lib/Target/PowerPC/PPCCodeEmitter.cpp
index f80442ffc6..c3be878a08 100644
--- a/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Module.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
@@ -28,18 +29,36 @@
 using namespace llvm;
 
 namespace {
-  class VISIBILITY_HIDDEN PPCCodeEmitter : public MachineFunctionPass {
+  class PPCCodeEmitter {
     TargetMachine &TM;
     MachineCodeEmitter &MCE;
+  public:
+    PPCCodeEmitter( TargetMachine &tm, MachineCodeEmitter &mce) : 
+        TM( tm), MCE( mce) {}
+
+    /// getBinaryCodeForInstr - This function, generated by the
+    /// CodeEmitterGenerator using TableGen, produces the binary encoding for
+    /// machine instructions.
+
+    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
+
+    /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
+
+    unsigned getMachineOpValue(const MachineInstr &MI, const MachineOperand &MO);
 
     /// MovePCtoLROffset - When/if we see a MovePCtoLR instruction, we record
     /// its address in the function into this pointer.
+
     void *MovePCtoLROffset;
-    
-    /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
-    ///
-    unsigned getMachineOpValue(const MachineInstr &MI, const MachineOperand &MO);
-    
+  };
+
+  template <class machineCodeEmitter>
+  class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass,
+      public PPCCodeEmitter
+  {
+    TargetMachine &TM;
+    machineCodeEmitter &MCE;
+
     void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired<MachineModuleInfo>();
       MachineFunctionPass::getAnalysisUsage(AU);
@@ -47,8 +66,8 @@ namespace {
 
   public:
     static char ID;
-    PPCCodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
-      : MachineFunctionPass(&ID), TM(T), MCE(M) {}
+    Emitter(TargetMachine &tm, machineCodeEmitter &mce)
+      : MachineFunctionPass(&ID), PPCCodeEmitter( tm, mce), TM(tm), MCE(mce) {}
 
     const char *getPassName() const { return "PowerPC Machine Code Emitter"; }
 
@@ -63,24 +82,26 @@ namespace {
     /// getValueBit - return the particular bit of Val
     ///
     unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
-
-    /// getBinaryCodeForInstr - This function, generated by the
-    /// CodeEmitterGenerator using TableGen, produces the binary encoding for
-    /// machine instructions.
-    ///
-    unsigned getBinaryCodeForInstr(const MachineInstr &MI);
   };
-  char PPCCodeEmitter::ID = 0;
-}
 
+  template <class machineCodeEmitter>
+    char Emitter<machineCodeEmitter>::ID = 0;
+}
+	
 /// createPPCCodeEmitterPass - Return a pass that emits the collected PPC code
 /// to the specified MCE object.
 FunctionPass *llvm::createPPCCodeEmitterPass(PPCTargetMachine &TM,
-                                             MachineCodeEmitter &MCE) {
-  return new PPCCodeEmitter(TM, MCE);
+                                       MachineCodeEmitter &MCE) {
+  return new Emitter<MachineCodeEmitter>(TM, MCE);
+}
+
+FunctionPass *llvm::createPPCJITCodeEmitterPass(PPCTargetMachine &TM,
+                                             JITCodeEmitter &JCE) {
+  return new Emitter<JITCodeEmitter>(TM, JCE);
 }
 
-bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
+template <class machineCodeEmitter>
+bool Emitter<machineCodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
   assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
           MF.getTarget().getRelocationModel() != Reloc::Static) &&
          "JIT relocation model must be set to static or default!");
@@ -96,7 +117,8 @@ bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
   return false;
 }
 
-void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
+template <class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitBasicBlock(MachineBasicBlock &MBB) {
   MCE.StartMachineBasicBlock(&MBB);
   
   for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I){
diff --git a/lib/Target/PowerPC/PPCJITInfo.cpp b/lib/Target/PowerPC/PPCJITInfo.cpp
index b5de31868d..035647ec5a 100644
--- a/lib/Target/PowerPC/PPCJITInfo.cpp
+++ b/lib/Target/PowerPC/PPCJITInfo.cpp
@@ -16,7 +16,6 @@
 #include "PPCRelocations.h"
 #include "PPCTargetMachine.h"
 #include "llvm/Function.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
 #include "llvm/System/Memory.h"
 #include "llvm/Support/Debug.h"
 using namespace llvm;
@@ -330,51 +329,51 @@ extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
 #endif
 
 void *PPCJITInfo::emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE) {
+                                   JITCodeEmitter &JCE) {
   // If this is just a call to an external function, emit a branch instead of a
   // call.  The code is the same except for one bit of the last instruction.
   if (Fn != (void*)(intptr_t)PPC32CompilationCallback && 
       Fn != (void*)(intptr_t)PPC64CompilationCallback) {
-    MCE.startGVStub(F, 7*4);
-    intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
-    MCE.emitWordBE(0);
-    MCE.emitWordBE(0);
-    MCE.emitWordBE(0);
-    MCE.emitWordBE(0);
-    MCE.emitWordBE(0);
-    MCE.emitWordBE(0);
-    MCE.emitWordBE(0);
+    JCE.startGVStub(F, 7*4);
+    intptr_t Addr = (intptr_t)JCE.getCurrentPCValue();
+    JCE.emitWordBE(0);
+    JCE.emitWordBE(0);
+    JCE.emitWordBE(0);
+    JCE.emitWordBE(0);
+    JCE.emitWordBE(0);
+    JCE.emitWordBE(0);
+    JCE.emitWordBE(0);
     EmitBranchToAt(Addr, (intptr_t)Fn, false, is64Bit);
     sys::Memory::InvalidateInstructionCache((void*)Addr, 7*4);
-    return MCE.finishGVStub(F);
+    return JCE.finishGVStub(F);
   }
 
-  MCE.startGVStub(F, 10*4);
-  intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
+  JCE.startGVStub(F, 10*4);
+  intptr_t Addr = (intptr_t)JCE.getCurrentPCValue();
   if (is64Bit) {
-    MCE.emitWordBE(0xf821ffb1);     // stdu r1,-80(r1)
-    MCE.emitWordBE(0x7d6802a6);     // mflr r11
-    MCE.emitWordBE(0xf9610060);     // std r11, 96(r1)
+    JCE.emitWordBE(0xf821ffb1);     // stdu r1,-80(r1)
+    JCE.emitWordBE(0x7d6802a6);     // mflr r11
+    JCE.emitWordBE(0xf9610060);     // std r11, 96(r1)
   } else if (TM.getSubtargetImpl()->isMachoABI()){
-    MCE.emitWordBE(0x9421ffe0);     // stwu r1,-32(r1)
-    MCE.emitWordBE(0x7d6802a6);     // mflr r11
-    MCE.emitWordBE(0x91610028);     // stw r11, 40(r1)
+    JCE.emitWordBE(0x9421ffe0);     // stwu r1,-32(r1)
+    JCE.emitWordBE(0x7d6802a6);     // mflr r11
+    JCE.emitWordBE(0x91610028);     // stw r11, 40(r1)
   } else {
-    MCE.emitWordBE(0x9421ffe0);     // stwu r1,-32(r1)
-    MCE.emitWordBE(0x7d6802a6);     // mflr r11
-    MCE.emitWordBE(0x91610024);     // stw r11, 36(r1)
+    JCE.emitWordBE(0x9421ffe0);     // stwu r1,-32(r1)
+    JCE.emitWordBE(0x7d6802a6);     // mflr r11
+    JCE.emitWordBE(0x91610024);     // stw r11, 36(r1)
   }
-  intptr_t BranchAddr = (intptr_t)MCE.getCurrentPCValue();
-  MCE.emitWordBE(0);
-  MCE.emitWordBE(0);
-  MCE.emitWordBE(0);
-  MCE.emitWordBE(0);
-  MCE.emitWordBE(0);
-  MCE.emitWordBE(0);
-  MCE.emitWordBE(0);
+  intptr_t BranchAddr = (intptr_t)JCE.getCurrentPCValue();
+  JCE.emitWordBE(0);
+  JCE.emitWordBE(0);
+  JCE.emitWordBE(0);
+  JCE.emitWordBE(0);
+  JCE.emitWordBE(0);
+  JCE.emitWordBE(0);
+  JCE.emitWordBE(0);
   EmitBranchToAt(BranchAddr, (intptr_t)Fn, true, is64Bit);
   sys::Memory::InvalidateInstructionCache((void*)Addr, 10*4);
-  return MCE.finishGVStub(F);
+  return JCE.finishGVStub(F);
 }
 
 
diff --git a/lib/Target/PowerPC/PPCJITInfo.h b/lib/Target/PowerPC/PPCJITInfo.h
index c93a84aca0..2e25b295f4 100644
--- a/lib/Target/PowerPC/PPCJITInfo.h
+++ b/lib/Target/PowerPC/PPCJITInfo.h
@@ -15,6 +15,7 @@
 #define POWERPC_JITINFO_H
 
 #include "llvm/Target/TargetJITInfo.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 
 namespace llvm {
   class PPCTargetMachine;
@@ -30,7 +31,7 @@ namespace llvm {
     }
 
     virtual void *emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE);
+                                   JITCodeEmitter &JCE);
     virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
     virtual void relocate(void *Function, MachineRelocation *MR,
                           unsigned NumRelocs, unsigned char* GOTBase);
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index bb17ea93fc..aeb451b641 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -186,6 +186,38 @@ bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
   return false;
 }
 
+bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
+                                      CodeGenOpt::Level OptLevel,
+                                      bool DumpAsm, JITCodeEmitter &JCE) {
+  // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64.
+  // FIXME: This should be moved to TargetJITInfo!!
+  if (Subtarget.isPPC64()) {
+    // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many
+    // instructions to materialize arbitrary global variable + function +
+    // constant pool addresses.
+    setRelocationModel(Reloc::PIC_);
+    // Temporary workaround for the inability of PPC64 JIT to handle jump
+    // tables.
+    DisableJumpTables = true;      
+  } else {
+    setRelocationModel(Reloc::Static);
+  }
+  
+  // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
+  // writing?
+  Subtarget.SetJITMode();
+  
+  // Machine code emitter pass for PowerPC.
+  PM.add(createPPCJITCodeEmitterPass(*this, JCE));
+  if (DumpAsm) {
+    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
+    if (AsmPrinterCtor)
+      PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
+  }
+
+  return false;
+}
+
 bool PPCTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
                                             CodeGenOpt::Level OptLevel,
                                             bool DumpAsm, MachineCodeEmitter &MCE) {
@@ -199,3 +231,18 @@ bool PPCTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
 
   return false;
 }
+
+bool PPCTargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
+                                            CodeGenOpt::Level OptLevel,
+                                            bool DumpAsm, JITCodeEmitter &JCE) {
+  // Machine code emitter pass for PowerPC.
+  PM.add(createPPCJITCodeEmitterPass(*this, JCE));
+  if (DumpAsm) {
+    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
+    if (AsmPrinterCtor)
+      PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
+  }
+
+  return false;
+}
+
diff --git a/lib/Target/PowerPC/PPCTargetMachine.h b/lib/Target/PowerPC/PPCTargetMachine.h
index efdf918d79..086d2f4cf8 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.h
+++ b/lib/Target/PowerPC/PPCTargetMachine.h
@@ -84,9 +84,14 @@ public:
                                   bool Verbose, raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
                               bool DumpAsm, MachineCodeEmitter &MCE);
+  virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
+                              bool DumpAsm, JITCodeEmitter &JCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
                                     CodeGenOpt::Level OptLevel,
                                     bool DumpAsm, MachineCodeEmitter &MCE);
+  virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
+                                    CodeGenOpt::Level OptLevel,
+                                    bool DumpAsm, JITCodeEmitter &JCE);
   virtual bool getEnableTailMergeDefault() const;
 };
 
diff --git a/lib/Target/X86/X86.h b/lib/Target/X86/X86.h
index a9ac859e77..fe0dca61b8 100644
--- a/lib/Target/X86/X86.h
+++ b/lib/Target/X86/X86.h
@@ -22,6 +22,7 @@ namespace llvm {
 class X86TargetMachine;
 class FunctionPass;
 class MachineCodeEmitter;
+class JITCodeEmitter;
 class raw_ostream;
 
 /// createX86ISelDag - This pass converts a legalized DAG into a 
@@ -51,8 +52,11 @@ FunctionPass *createX86CodePrinterPass(raw_ostream &o,
 
 /// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
 /// to the specified MCE object.
-FunctionPass *createX86CodeEmitterPass(X86TargetMachine &TM,
-                                       MachineCodeEmitter &MCE);
+
+FunctionPass *createX86CodeEmitterPass(
+    X86TargetMachine &TM, MachineCodeEmitter &MCE);
+FunctionPass *createX86JITCodeEmitterPass(
+    X86TargetMachine &TM, JITCodeEmitter &JCE);
 
 /// createX86EmitCodeToMemory - Returns a pass that converts a register
 /// allocated function into raw machine code in a dynamically
diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index efd64e05ec..47d762585d 100644
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -21,6 +21,7 @@
 #include "X86.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
@@ -35,21 +36,22 @@ using namespace llvm;
 STATISTIC(NumEmitted, "Number of machine instructions emitted");
 
 namespace {
+template< class machineCodeEmitter>
   class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass {
     const X86InstrInfo  *II;
     const TargetData    *TD;
     X86TargetMachine    &TM;
-    MachineCodeEmitter  &MCE;
+    machineCodeEmitter  &MCE;
     intptr_t PICBaseOffset;
     bool Is64BitMode;
     bool IsPIC;
   public:
     static char ID;
-    explicit Emitter(X86TargetMachine &tm, MachineCodeEmitter &mce)
+    explicit Emitter(X86TargetMachine &tm, machineCodeEmitter &mce)
       : MachineFunctionPass(&ID), II(0), TD(0), TM(tm), 
       MCE(mce), PICBaseOffset(0), Is64BitMode(false),
       IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
-    Emitter(X86TargetMachine &tm, MachineCodeEmitter &mce,
+    Emitter(X86TargetMachine &tm, machineCodeEmitter &mce,
             const X86InstrInfo &ii, const TargetData &td, bool is64)
       : MachineFunctionPass(&ID), II(&ii), TD(&td), TM(tm), 
       MCE(mce), PICBaseOffset(0), Is64BitMode(is64),
@@ -96,17 +98,31 @@ namespace {
 
     bool gvNeedsNonLazyPtr(const GlobalValue *GV);
   };
-  char Emitter::ID = 0;
+
+template< class machineCodeEmitter>
+  char Emitter<machineCodeEmitter>::ID = 0;
 }
 
 /// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
-/// to the specified MCE object.
-FunctionPass *llvm::createX86CodeEmitterPass(X86TargetMachine &TM,
-                                             MachineCodeEmitter &MCE) {
-  return new Emitter(TM, MCE);
+/// to the specified templated MachineCodeEmitter object.
+
+namespace llvm {
+	
+FunctionPass *createX86CodeEmitterPass(
+    X86TargetMachine &TM, MachineCodeEmitter &MCE)
+{
+  return new Emitter<MachineCodeEmitter>(TM, MCE);
+}
+FunctionPass *createX86JITCodeEmitterPass(
+    X86TargetMachine &TM, JITCodeEmitter &JCE)
+{
+  return new Emitter<JITCodeEmitter>(TM, JCE);
 }
 
-bool Emitter::runOnMachineFunction(MachineFunction &MF) {
+} // end namespace llvm
+
+template< class machineCodeEmitter>
+bool Emitter<machineCodeEmitter>::runOnMachineFunction(MachineFunction &MF) {
  
   MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
   
@@ -140,7 +156,8 @@ bool Emitter::runOnMachineFunction(MachineFunction &MF) {
 /// necessary to resolve the address of this block later and emits a dummy
 /// value.
 ///
-void Emitter::emitPCRelativeBlockAddress(MachineBasicBlock *MBB) {
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitPCRelativeBlockAddress(MachineBasicBlock *MBB) {
   // Remember where this reference was and where it is to so we can
   // deal with it later.
   MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
@@ -151,7 +168,8 @@ void Emitter::emitPCRelativeBlockAddress(MachineBasicBlock *MBB) {
 /// emitGlobalAddress - Emit the specified address to the code stream assuming
 /// this is part of a "take the address of a global" instruction.
 ///
-void Emitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
                                 intptr_t Disp /* = 0 */,
                                 intptr_t PCAdj /* = 0 */,
                                 bool NeedStub /* = false */,
@@ -177,7 +195,8 @@ void Emitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
 /// emitExternalSymbolAddress - Arrange for the address of an external symbol to
 /// be emitted to the current location in the function, and allow it to be PC
 /// relative.
-void Emitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
   intptr_t RelocCST = (Reloc == X86::reloc_picrel_word) ? PICBaseOffset : 0;
   MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
                                                  Reloc, ES, RelocCST));
@@ -190,7 +209,8 @@ void Emitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
 /// emitConstPoolAddress - Arrange for the address of an constant pool
 /// to be emitted to the current location in the function, and allow it to be PC
 /// relative.
-void Emitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
                                    intptr_t Disp /* = 0 */,
                                    intptr_t PCAdj /* = 0 */) {
   intptr_t RelocCST = 0;
@@ -210,7 +230,8 @@ void Emitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
 /// emitJumpTableAddress - Arrange for the address of a jump table to
 /// be emitted to the current location in the function, and allow it to be PC
 /// relative.
-void Emitter::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
                                    intptr_t PCAdj /* = 0 */) {
   intptr_t RelocCST = 0;
   if (Reloc == X86::reloc_picrel_word)
@@ -226,7 +247,8 @@ void Emitter::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
     MCE.emitWordLE(0);
 }
 
-unsigned Emitter::getX86RegNum(unsigned RegNo) const {
+template< class machineCodeEmitter>
+unsigned Emitter<machineCodeEmitter>::getX86RegNum(unsigned RegNo) const {
   return II->getRegisterInfo().getX86RegNum(RegNo);
 }
 
@@ -236,20 +258,24 @@ inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
   return RM | (RegOpcode << 3) | (Mod << 6);
 }
 
-void Emitter::emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeFld){
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeFld){
   MCE.emitByte(ModRMByte(3, RegOpcodeFld, getX86RegNum(ModRMReg)));
 }
 
-void Emitter::emitRegModRMByte(unsigned RegOpcodeFld) {
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitRegModRMByte(unsigned RegOpcodeFld) {
   MCE.emitByte(ModRMByte(3, RegOpcodeFld, 0));
 }
 
-void Emitter::emitSIBByte(unsigned SS, unsigned Index, unsigned Base) {
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitSIBByte(unsigned SS, unsigned Index, unsigned Base) {
   // SIB byte is in the same format as the ModRMByte...
   MCE.emitByte(ModRMByte(SS, Index, Base));
 }
 
-void Emitter::emitConstant(uint64_t Val, unsigned Size) {
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitConstant(uint64_t Val, unsigned Size) {
   // Output the constant in little endian byte order...
   for (unsigned i = 0; i != Size; ++i) {
     MCE.emitByte(Val & 255);
@@ -263,14 +289,16 @@ static bool isDisp8(int Value) {
   return Value == (signed char)Value;
 }
 
-bool Emitter::gvNeedsNonLazyPtr(const GlobalValue *GV) {
+template< class machineCodeEmitter>
+bool Emitter<machineCodeEmitter>::gvNeedsNonLazyPtr(const GlobalValue *GV) {
   // For Darwin, simulate the linktime GOT by using the same non-lazy-pointer
   // mechanism as 32-bit mode.
   return (!Is64BitMode || TM.getSubtarget<X86Subtarget>().isTargetDarwin()) &&
     TM.getSubtarget<X86Subtarget>().GVRequiresExtraLoad(GV, TM, false);
 }
 
-void Emitter::emitDisplacementField(const MachineOperand *RelocOp,
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitDisplacementField(const MachineOperand *RelocOp,
                                     int DispVal, intptr_t PCAdj) {
   // If this is a simple integer displacement that doesn't require a relocation,
   // emit it now.
@@ -304,7 +332,8 @@ void Emitter::emitDisplacementField(const MachineOperand *RelocOp,
   }
 }
 
-void Emitter::emitMemModRMByte(const MachineInstr &MI,
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitMemModRMByte(const MachineInstr &MI,
                                unsigned Op, unsigned RegOpcodeField,
                                intptr_t PCAdj) {
   const MachineOperand &Op3 = MI.getOperand(Op+3);
@@ -421,7 +450,9 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
   }
 }
 
-void Emitter::emitInstruction(const MachineInstr &MI,
+template< class machineCodeEmitter>
+void Emitter<machineCodeEmitter>::emitInstruction(
+                              const MachineInstr &MI,
                               const TargetInstrDesc *Desc) {
   DOUT << MI;
 
@@ -773,3 +804,4 @@ void Emitter::emitInstruction(const MachineInstr &MI,
     abort();
   }
 }
+
diff --git a/lib/Target/X86/X86JITInfo.cpp b/lib/Target/X86/X86JITInfo.cpp
index 4bbccf380c..f92310607a 100644
--- a/lib/Target/X86/X86JITInfo.cpp
+++ b/lib/Target/X86/X86JITInfo.cpp
@@ -16,7 +16,6 @@
 #include "X86Relocations.h"
 #include "X86Subtarget.h"
 #include "llvm/Function.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
 #include "llvm/Config/alloca.h"
 #include "llvm/Support/Compiler.h"
 #include <cstdlib>
@@ -430,20 +429,20 @@ X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
 }
 
 void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
-                                             MachineCodeEmitter &MCE) {
+                                             JITCodeEmitter &JCE) {
 #if defined (X86_64_JIT)
-  MCE.startGVStub(GV, 8, 8);
-  MCE.emitWordLE((unsigned)(intptr_t)ptr);
-  MCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
+  JCE.startGVStub(GV, 8, 8);
+  JCE.emitWordLE((unsigned)(intptr_t)ptr);
+  JCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
 #else
-  MCE.startGVStub(GV, 4, 4);
-  MCE.emitWordLE((intptr_t)ptr);
+  JCE.startGVStub(GV, 4, 4);
+  JCE.emitWordLE((intptr_t)ptr);
 #endif
-  return MCE.finishGVStub(GV);
+  return JCE.finishGVStub(GV);
 }
 
 void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE) {
+                                   JITCodeEmitter &JCE) {
   // Note, we cast to intptr_t here to silence a -pedantic warning that 
   // complains about casting a function pointer to a normal pointer.
 #if defined (X86_32_JIT) && !defined (_MSC_VER)
@@ -454,55 +453,55 @@ void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn,
 #endif
   if (NotCC) {
 #if defined (X86_64_JIT)
-    MCE.startGVStub(F, 13, 4);
-    MCE.emitByte(0x49);          // REX prefix
-    MCE.emitByte(0xB8+2);        // movabsq r10
-    MCE.emitWordLE((unsigned)(intptr_t)Fn);
-    MCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
-    MCE.emitByte(0x41);          // REX prefix
-    MCE.emitByte(0xFF);          // jmpq *r10
-    MCE.emitByte(2 | (4 << 3) | (3 << 6));
+    JCE.startGVStub(F, 13, 4);
+    JCE.emitByte(0x49);          // REX prefix
+    JCE.emitByte(0xB8+2);        // movabsq r10
+    JCE.emitWordLE((unsigned)(intptr_t)Fn);
+    JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
+    JCE.emitByte(0x41);          // REX prefix
+    JCE.emitByte(0xFF);          // jmpq *r10
+    JCE.emitByte(2 | (4 << 3) | (3 << 6));
 #else
-    MCE.startGVStub(F, 5, 4);
-    MCE.emitByte(0xE9);
-    MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
+    JCE.startGVStub(F, 5, 4);
+    JCE.emitByte(0xE9);
+    JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
 #endif
-    return MCE.finishGVStub(F);
+    return JCE.finishGVStub(F);
   }
 
 #if defined (X86_64_JIT)
-  MCE.startGVStub(F, 14, 4);
-  MCE.emitByte(0x49);          // REX prefix
-  MCE.emitByte(0xB8+2);        // movabsq r10
-  MCE.emitWordLE((unsigned)(intptr_t)Fn);
-  MCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
-  MCE.emitByte(0x41);          // REX prefix
-  MCE.emitByte(0xFF);          // callq *r10
-  MCE.emitByte(2 | (2 << 3) | (3 << 6));
+  JCE.startGVStub(F, 14, 4);
+  JCE.emitByte(0x49);          // REX prefix
+  JCE.emitByte(0xB8+2);        // movabsq r10
+  JCE.emitWordLE((unsigned)(intptr_t)Fn);
+  JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
+  JCE.emitByte(0x41);          // REX prefix
+  JCE.emitByte(0xFF);          // callq *r10
+  JCE.emitByte(2 | (2 << 3) | (3 << 6));
 #else
-  MCE.startGVStub(F, 6, 4);
-  MCE.emitByte(0xE8);   // Call with 32 bit pc-rel destination...
+  JCE.startGVStub(F, 6, 4);
+  JCE.emitByte(0xE8);   // Call with 32 bit pc-rel destination...
 
-  MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
+  JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
 #endif
 
-  MCE.emitByte(0xCD);   // Interrupt - Just a marker identifying the stub!
-  return MCE.finishGVStub(F);
+  JCE.emitByte(0xCD);   // Interrupt - Just a marker identifying the stub!
+  return JCE.finishGVStub(F);
 }
 
 void X86JITInfo::emitFunctionStubAtAddr(const Function* F, void *Fn, void *Stub,
-                                        MachineCodeEmitter &MCE) {
+                                        JITCodeEmitter &JCE) {
   // Note, we cast to intptr_t here to silence a -pedantic warning that 
   // complains about casting a function pointer to a normal pointer.
-  MCE.startGVStub(F, Stub, 5);
-  MCE.emitByte(0xE9);
+  JCE.startGVStub(F, Stub, 5);
+  JCE.emitByte(0xE9);
 #if defined (X86_64_JIT)
-  assert(((((intptr_t)Fn-MCE.getCurrentPCValue()-5) << 32) >> 32) == 
-          ((intptr_t)Fn-MCE.getCurrentPCValue()-5) 
+  assert(((((intptr_t)Fn-JCE.getCurrentPCValue()-5) << 32) >> 32) == 
+          ((intptr_t)Fn-JCE.getCurrentPCValue()-5) 
          && "PIC displacement does not fit in displacement field!");
 #endif
-  MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4);
-  MCE.finishGVStub(F);
+  JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
+  JCE.finishGVStub(F);
 }
 
 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
diff --git a/lib/Target/X86/X86JITInfo.h b/lib/Target/X86/X86JITInfo.h
index 9affa3176b..6a4e2148a5 100644
--- a/lib/Target/X86/X86JITInfo.h
+++ b/lib/Target/X86/X86JITInfo.h
@@ -15,6 +15,7 @@
 #define X86JITINFO_H
 
 #include "llvm/Function.h"
+#include "llvm/CodeGen/JITCodeEmitter.h"
 #include "llvm/Target/TargetJITInfo.h"
 
 namespace llvm {
@@ -37,23 +38,23 @@ namespace llvm {
     ///
     virtual void replaceMachineCodeForFunction(void *Old, void *New);
 
-    /// emitGlobalValueIndirectSym - Use the specified MachineCodeEmitter object
+    /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
     /// to emit an indirect symbol which contains the address of the specified
     /// ptr.
     virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
-                                             MachineCodeEmitter &MCE);
+                                             JITCodeEmitter &JCE);
 
-    /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
+    /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
     /// small native function that simply calls the function at the specified
     /// address.
     virtual void *emitFunctionStub(const Function* F, void *Fn,
-                                   MachineCodeEmitter &MCE);
+                                   JITCodeEmitter &JCE);
 
-    /// emitFunctionStubAtAddr - Use the specified MachineCodeEmitter object to
+    /// emitFunctionStubAtAddr - Use the specified JITCodeEmitter object to
     /// emit a small native function that simply calls Fn. Emit the stub into
     /// the supplied buffer.
     virtual void emitFunctionStubAtAddr(const Function* F, void *Fn,
-                                        void *Buffer, MachineCodeEmitter &MCE);
+                                        void *Buffer, JITCodeEmitter &JCE);
 
     /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
     /// specific basic block.
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 761d098b5e..d4673b0cb0 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -248,6 +248,35 @@ bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
   return false;
 }
 
+bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
+                                      CodeGenOpt::Level OptLevel,
+                                      bool DumpAsm, JITCodeEmitter &JCE) {
+  // FIXME: Move this to TargetJITInfo!
+  // On Darwin, do not override 64-bit setting made in X86TargetMachine().
+  if (DefRelocModel == Reloc::Default && 
+        (!Subtarget.isTargetDarwin() || !Subtarget.is64Bit()))
+    setRelocationModel(Reloc::Static);
+  
+  // 64-bit JIT places everything in the same buffer except external functions.
+  // On Darwin, use small code model but hack the call instruction for 
+  // externals.  Elsewhere, do not assume globals are in the lower 4G.
+  if (Subtarget.is64Bit()) {
+    if (Subtarget.isTargetDarwin())
+      setCodeModel(CodeModel::Small);
+    else
+      setCodeModel(CodeModel::Large);
+  }
+
+  PM.add(createX86JITCodeEmitterPass(*this, JCE));
+  if (DumpAsm) {
+    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
+    if (AsmPrinterCtor)
+      PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
+  }
+
+  return false;
+}
+
 bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
                                             CodeGenOpt::Level OptLevel,
                                             bool DumpAsm,
@@ -262,6 +291,20 @@ bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
   return false;
 }
 
+bool X86TargetMachine::addSimpleCodeEmitter(PassManagerBase &PM,
+                                            CodeGenOpt::Level OptLevel,
+                                            bool DumpAsm,
+                                            JITCodeEmitter &JCE) {
+  PM.add(createX86JITCodeEmitterPass(*this, JCE));
+  if (DumpAsm) {
+    assert(AsmPrinterCtor && "AsmPrinter was not linked in");
+    if (AsmPrinterCtor)
+      PM.add(AsmPrinterCtor(errs(), *this, OptLevel, true));
+  }
+
+  return false;
+}
+
 /// symbolicAddressesAreRIPRel - Return true if symbolic addresses are
 /// RIP-relative on this machine, taking into consideration the relocation
 /// model and subtarget. RIP-relative addresses cannot have a separate
diff --git a/lib/Target/X86/X86TargetMachine.h b/lib/Target/X86/X86TargetMachine.h
index c25fc1de04..ecc1d39701 100644
--- a/lib/Target/X86/X86TargetMachine.h
+++ b/lib/Target/X86/X86TargetMachine.h
@@ -83,9 +83,14 @@ public:
                                   bool Verbose, raw_ostream &Out);
   virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
                               bool DumpAsm, MachineCodeEmitter &MCE);
+  virtual bool addCodeEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
+                              bool DumpAsm, JITCodeEmitter &JCE);
   virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
                                     CodeGenOpt::Level OptLevel,
                                     bool DumpAsm, MachineCodeEmitter &MCE);
+  virtual bool addSimpleCodeEmitter(PassManagerBase &PM,
+                                    CodeGenOpt::Level OptLevel,
+                                    bool DumpAsm, JITCodeEmitter &JCE);
 
   /// symbolicAddressesAreRIPRel - Return true if symbolic addresses are
   /// RIP-relative on this machine, taking into consideration the relocation