Enable exception handling int JIT

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47079 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineCodeEmitter.h

@@ -26,6 +26,7 @@ class MachineBasicBlock;
 class MachineConstantPool;
 class MachineJumpTableInfo;
 class MachineFunction;
+class MachineModuleInfo;
 class MachineRelocation;
 class Value;
 class GlobalValue;
@@ -136,6 +137,72 @@ public:
       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 = String.size(); i < N; ++i) {
+      unsigned char C = String[i];
+      emitByte(C);
+    }
+    emitByte(0);
+  }
+  
+  /// emitInt32 - Emit a int32 directive.
+  void emitInt32(int Value) {
+    if (CurBufferPtr+4 <= BufferEnd) {
+      *((uint32_t*)CurBufferPtr) = Value;
+      CurBufferPtr += 4;
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+
+  /// emitInt64 - Emit a int64 directive.
+  void emitInt64(uint64_t Value) {
+    if (CurBufferPtr+8 <= BufferEnd) {
+      *((uint64_t*)CurBufferPtr) = Value;
+      CurBufferPtr += 8;
+    } else {
+      CurBufferPtr = BufferEnd;
+    }
+  }
+  
+  /// emitAt - Emit Value in Addr
+  void emitAt(uintptr_t *Addr, uintptr_t Value) {
+    if (Addr >= (uintptr_t*)BufferBegin && Addr < (uintptr_t*)BufferEnd)
+      (*Addr) = 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.
@@ -194,6 +261,15 @@ public:
   /// emitted.
   ///
   virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
+
+  /// getLabelAddress - Return the address of the specified LabelID, only usable
+  /// after the LabelID has been emitted.
+  ///
+  virtual intptr_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

include/llvm/ExecutionEngine/ExecutionEngine.h

@@ -85,6 +85,11 @@ protected:
   /// pointer is invoked to create it. If this returns null, the JIT will abort.
   void* (*LazyFunctionCreator)(const std::string &);
   
+  /// ExceptionTableRegister - If Exception Handling is set, the JIT will 
+  /// register dwarf tables with this function
+  typedef void (*EERegisterFn)(void*);
+  static EERegisterFn ExceptionTableRegister;
+
 public:
   /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
   /// JITEmitter classes.  It must be held while changing the internal state of
@@ -246,6 +251,19 @@ public:
   void InstallLazyFunctionCreator(void* (*P)(const std::string &)) {
     LazyFunctionCreator = P;
   }
+  
+  /// InstallExceptionTableRegister - The JIT will use the given function
+  /// to register the exception tables it generates.
+  static void InstallExceptionTableRegister(void (*F)(void*)) {
+    ExceptionTableRegister = F;
+  }
+  
+  /// RegisterTable - Registers the given pointer as an exception table. It uses
+  /// the ExceptionTableRegister function.
+  static void RegisterTable(void* res) {
+    if (ExceptionTableRegister)
+      ExceptionTableRegister(res);
+  }
 
 protected:
   explicit ExecutionEngine(ModuleProvider *P);

include/llvm/ExecutionEngine/JITMemoryManager.h

@@ -89,6 +89,17 @@ public:
   /// deallocateMemForFunction - Free JIT memory for the specified function.
   /// This is never called when the JIT is currently emitting a function.
   virtual void deallocateMemForFunction(const Function *F) = 0;
+  
+  /// startExceptionTable - When we finished JITing the function, if exception
+  /// handling is set, we emit the exception table.
+  virtual unsigned char* startExceptionTable(const Function* F,
+                                             uintptr_t &ActualSize) = 0;
+  
+  /// endExceptionTable - This method is called when the JIT is done emitting
+  /// the exception table.
+  virtual void endExceptionTable(const Function *F, unsigned char *TableStart,
+                                 unsigned char *TableEnd, 
+                                 unsigned char* FrameRegister) = 0;
 };
 
 } // end namespace llvm.

lib/CodeGen/ELFWriter.cpp

@@ -98,6 +98,21 @@ namespace llvm {
       return 0;
     }
 
+    virtual intptr_t getLabelAddress(uint64_t Label) const {
+      assert(0 && "Label address not implementated yet!");
+      abort();
+      return 0;
+    }
+
+    virtual void emitLabel(uint64_t LabelID) {
+      assert(0 && "emit Label not implementated yet!");
+      abort();
+    }
+
+
+    virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) { }
+
+
     /// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
     void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) {
       assert(0 && "JIT specific function called!");

lib/CodeGen/LLVMTargetMachine.cpp

@@ -186,8 +186,8 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
   
   PM.add(createGCLoweringPass());
   
-  // FIXME: Implement the invoke/unwind instructions!
-  PM.add(createLowerInvokePass(getTargetLowering()));
+  if (!ExceptionHandling)
+    PM.add(createLowerInvokePass(getTargetLowering()));
   
   // Make sure that no unreachable blocks are instruction selected.
   PM.add(createUnreachableBlockEliminationPass());

lib/CodeGen/MachOWriter.cpp

@@ -125,6 +125,20 @@ namespace llvm {
       return MBBLocations[MBB->getNumber()];
     }
 
+    virtual intptr_t getLabelAddress(uint64_t Label) const {
+      assert(0 && "get Label not implemented");
+      abort();
+      return 0;
+    }
+
+    virtual void emitLabel(uint64_t LabelID) {
+      assert(0 && "emit Label not implemented");
+      abort();
+    }
+
+
+    virtual void setModuleInfo(llvm::MachineModuleInfo* MMI) { }
+
     /// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
     virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) {
       assert(0 && "JIT specific function called!");

lib/ExecutionEngine/ExecutionEngine.cpp

@@ -34,6 +34,8 @@ STATISTIC(NumGlobals  , "Number of global vars initialized");
 
 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
+ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
+
 
 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
   LazyCompilationDisabled = false;

lib/ExecutionEngine/JIT/JITDwarfEmitter.cpp

@@ -0,0 +1,636 @@
+//===----- JITDwarfEmitter.cpp - Write dwarf tables into memory -----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a JITDwarfEmitter object that is used by the JIT to
+// write dwarf tables to memory.
+//
+//===----------------------------------------------------------------------===//
+
+#include "JIT.h"
+#include "JITDwarfEmitter.h"
+#include "llvm/Function.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/ExecutionEngine/JITMemoryManager.h"
+#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+
+using namespace llvm;
+
+JITDwarfEmitter::JITDwarfEmitter(JIT& theJit) : Jit(theJit) {}
+
+
+unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F, 
+                                               MachineCodeEmitter& mce,
+                                               unsigned char* StartFunction,
+                                               unsigned char* EndFunction) {
+  const TargetMachine& TM = F.getTarget();
+  TD = TM.getTargetData();
+  needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
+  stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
+  RI = TM.getRegisterInfo();
+  MCE = &mce;
+  
+  unsigned char* ExceptionTable = EmitExceptionTable(&F, StartFunction,
+                                                     EndFunction);
+      
+  unsigned char* Result = 0;
+  unsigned char* EHFramePtr = 0;
+
+  const std::vector<Function *> Personalities = MMI->getPersonalities();
+  EHFramePtr = EmitCommonEHFrame(Personalities[MMI->getPersonalityIndex()]);
+
+  Result = EmitEHFrame(Personalities[MMI->getPersonalityIndex()], EHFramePtr,
+                       StartFunction, EndFunction, ExceptionTable);
+  
+  return Result;
+}
+
+
+void JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr,
+                                     const std::vector<MachineMove> &Moves) {
+  unsigned PointerSize = TD->getPointerSize();
+  int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
+          PointerSize : -PointerSize;
+  bool IsLocal = BaseLabelPtr;
+
+  for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
+    const MachineMove &Move = Moves[i];
+    unsigned LabelID = Move.getLabelID();
+    
+    if (LabelID) {
+      LabelID = MMI->MappedLabel(LabelID);
+    
+      // Throw out move if the label is invalid.
+      if (!LabelID) continue;
+    }
+    
+    intptr_t LabelPtr = 0;
+    if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
+
+    const MachineLocation &Dst = Move.getDestination();
+    const MachineLocation &Src = Move.getSource();
+    
+    // Advance row if new location.
+    if (BaseLabelPtr && LabelID && (BaseLabelPtr != LabelPtr || !IsLocal)) {
+      MCE->emitByte(dwarf::DW_CFA_advance_loc4);
+      if (PointerSize == 8) {
+        MCE->emitInt64(LabelPtr - BaseLabelPtr);
+      } else {
+        MCE->emitInt32(LabelPtr - BaseLabelPtr);
+      }
+      
+      BaseLabelPtr = LabelPtr;
+      IsLocal = true;
+    }
+    
+    // If advancing cfa.
+    if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
+      if (!Src.isRegister()) {
+        if (Src.getRegister() == MachineLocation::VirtualFP) {
+          MCE->emitByte(dwarf::DW_CFA_def_cfa_offset);
+        } else {
+          MCE->emitByte(dwarf::DW_CFA_def_cfa);
+          MCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister(), true));
+        }
+        
+        int Offset = -Src.getOffset();
+        
+        MCE->emitULEB128Bytes(Offset);
+      } else {
+        assert(0 && "Machine move no supported yet.");
+      }
+    } else if (Src.isRegister() &&
+      Src.getRegister() == MachineLocation::VirtualFP) {
+      if (Dst.isRegister()) {
+        MCE->emitByte(dwarf::DW_CFA_def_cfa_register);
+        MCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getRegister(), true));
+      } else {
+        assert(0 && "Machine move no supported yet.");
+      }
+    } else {
+      unsigned Reg = RI->getDwarfRegNum(Src.getRegister(), true);
+      int Offset = Dst.getOffset() / stackGrowth;
+      
+      if (Offset < 0) {
+        MCE->emitByte(dwarf::DW_CFA_offset_extended_sf);
+        MCE->emitULEB128Bytes(Reg);
+        MCE->emitSLEB128Bytes(Offset);
+      } else if (Reg < 64) {
+        MCE->emitByte(dwarf::DW_CFA_offset + Reg);
+        MCE->emitULEB128Bytes(Offset);
+      } else {
+        MCE->emitByte(dwarf::DW_CFA_offset_extended);
+        MCE->emitULEB128Bytes(Reg);
+        MCE->emitULEB128Bytes(Offset);
+      }
+    }
+  }
+}
+
+/// SharedTypeIds - How many leading type ids two landing pads have in common.
+static unsigned SharedTypeIds(const LandingPadInfo *L,
+                              const LandingPadInfo *R) {
+  const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
+  unsigned LSize = LIds.size(), RSize = RIds.size();
+  unsigned MinSize = LSize < RSize ? LSize : RSize;
+  unsigned Count = 0;
+
+  for (; Count != MinSize; ++Count)
+    if (LIds[Count] != RIds[Count])
+      return Count;
+
+  return Count;
+}
+
+
+/// PadLT - Order landing pads lexicographically by type id.
+static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
+  const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
+  unsigned LSize = LIds.size(), RSize = RIds.size();
+  unsigned MinSize = LSize < RSize ? LSize : RSize;
+
+  for (unsigned i = 0; i != MinSize; ++i)
+    if (LIds[i] != RIds[i])
+      return LIds[i] < RIds[i];
+
+  return LSize < RSize;
+}
+
+struct KeyInfo {
+  static inline unsigned getEmptyKey() { return -1U; }
+  static inline unsigned getTombstoneKey() { return -2U; }
+  static unsigned getHashValue(const unsigned &Key) { return Key; }
+  static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
+  static bool isPod() { return true; }
+};
+
+/// ActionEntry - Structure describing an entry in the actions table.
+struct ActionEntry {
+  int ValueForTypeID; // The value to write - may not be equal to the type id.
+  int NextAction;
+  struct ActionEntry *Previous;
+};
+
+/// PadRange - Structure holding a try-range and the associated landing pad.
+struct PadRange {
+  // The index of the landing pad.
+  unsigned PadIndex;
+  // The index of the begin and end labels in the landing pad's label lists.
+  unsigned RangeIndex;
+};
+
+typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
+
+/// CallSiteEntry - Structure describing an entry in the call-site table.
+struct CallSiteEntry {
+  unsigned BeginLabel; // zero indicates the start of the function.
+  unsigned EndLabel;   // zero indicates the end of the function.
+  unsigned PadLabel;   // zero indicates that there is no landing pad.
+  unsigned Action;
+};
+
+unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
+                                         unsigned char* StartFunction,
+                                         unsigned char* EndFunction) {
+  // Map all labels and get rid of any dead landing pads.
+  MMI->TidyLandingPads();
+
+  const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
+  const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
+  const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
+  if (PadInfos.empty()) return 0;
+
+  // Sort the landing pads in order of their type ids.  This is used to fold
+  // duplicate actions.
+  SmallVector<const LandingPadInfo *, 64> LandingPads;
+  LandingPads.reserve(PadInfos.size());
+  for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
+    LandingPads.push_back(&PadInfos[i]);
+  std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
+
+  // Negative type ids index into FilterIds, positive type ids index into
+  // TypeInfos.  The value written for a positive type id is just the type
+  // id itself.  For a negative type id, however, the value written is the
+  // (negative) byte offset of the corresponding FilterIds entry.  The byte
+  // offset is usually equal to the type id, because the FilterIds entries
+  // are written using a variable width encoding which outputs one byte per
+  // entry as long as the value written is not too large, but can differ.
+  // This kind of complication does not occur for positive type ids because
+  // type infos are output using a fixed width encoding.
+  // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
+  SmallVector<int, 16> FilterOffsets;
+  FilterOffsets.reserve(FilterIds.size());
+  int Offset = -1;
+  for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
+    E = FilterIds.end(); I != E; ++I) {
+    FilterOffsets.push_back(Offset);
+    Offset -= AsmPrinter::SizeULEB128(*I);
+  }
+
+  // Compute the actions table and gather the first action index for each
+  // landing pad site.
+  SmallVector<ActionEntry, 32> Actions;
+  SmallVector<unsigned, 64> FirstActions;
+  FirstActions.reserve(LandingPads.size());
+
+  int FirstAction = 0;
+  unsigned SizeActions = 0;
+  for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
+    const LandingPadInfo *LP = LandingPads[i];
+    const std::vector<int> &TypeIds = LP->TypeIds;
+    const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
+    unsigned SizeSiteActions = 0;
+
+    if (NumShared < TypeIds.size()) {
+      unsigned SizeAction = 0;
+      ActionEntry *PrevAction = 0;
+
+      if (NumShared) {
+        const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
+        assert(Actions.size());
+        PrevAction = &Actions.back();
+        SizeAction = AsmPrinter::SizeSLEB128(PrevAction->NextAction) +
+          AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
+        for (unsigned j = NumShared; j != SizePrevIds; ++j) {
+          SizeAction -= AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
+          SizeAction += -PrevAction->NextAction;
+          PrevAction = PrevAction->Previous;
+        }
+      }
+
+      // Compute the actions.
+      for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
+        int TypeID = TypeIds[I];
+        assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
+        int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
+        unsigned SizeTypeID = AsmPrinter::SizeSLEB128(ValueForTypeID);
+
+        int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
+        SizeAction = SizeTypeID + AsmPrinter::SizeSLEB128(NextAction);
+        SizeSiteActions += SizeAction;
+
+        ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
+        Actions.push_back(Action);
+
+        PrevAction = &Actions.back();
+      }
+
+      // Record the first action of the landing pad site.
+      FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
+    } // else identical - re-use previous FirstAction
+
+    FirstActions.push_back(FirstAction);
+
+    // Compute this sites contribution to size.
+    SizeActions += SizeSiteActions;
+  }
+
+  // Compute the call-site table.  Entries must be ordered by address.
+  SmallVector<CallSiteEntry, 64> CallSites;
+
+  RangeMapType PadMap;
+  for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
+    const LandingPadInfo *LandingPad = LandingPads[i];
+    for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
+      unsigned BeginLabel = LandingPad->BeginLabels[j];
+      assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
+      PadRange P = { i, j };
+      PadMap[BeginLabel] = P;
+    }
+  }
+
+  bool MayThrow = false;
+  unsigned LastLabel = 0;
+  for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
+        I != E; ++I) {
+    for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
+          MI != E; ++MI) {
+      if (MI->getOpcode() != TargetInstrInfo::LABEL) {
+        MayThrow |= MI->getDesc().isCall();
+        continue;
+      }
+
+      unsigned BeginLabel = MI->getOperand(0).getImm();
+      assert(BeginLabel && "Invalid label!");
+
+      if (BeginLabel == LastLabel)
+        MayThrow = false;
+
+      RangeMapType::iterator L = PadMap.find(BeginLabel);
+
+      if (L == PadMap.end())
+        continue;
+
+      PadRange P = L->second;
+      const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
+
+      assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
+              "Inconsistent landing pad map!");
+
+      // If some instruction between the previous try-range and this one may
+      // throw, create a call-site entry with no landing pad for the region
+      // between the try-ranges.
+      if (MayThrow) {
+        CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
+        CallSites.push_back(Site);
+      }
+
+      LastLabel = LandingPad->EndLabels[P.RangeIndex];
+      CallSiteEntry Site = {BeginLabel, LastLabel,
+        LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
+
+      assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
+              "Invalid landing pad!");
+
+      // Try to merge with the previous call-site.
+      if (CallSites.size()) {
+        CallSiteEntry &Prev = CallSites[CallSites.size()-1];
+        if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
+          // Extend the range of the previous entry.
+          Prev.EndLabel = Site.EndLabel;
+          continue;
+        }
+      }
+
+      // Otherwise, create a new call-site.
+      CallSites.push_back(Site);
+    }
+  }
+  // If some instruction between the previous try-range and the end of the
+  // function may throw, create a call-site entry with no landing pad for the
+  // region following the try-range.
+  if (MayThrow) {
+    CallSiteEntry Site = {LastLabel, 0, 0, 0};
+    CallSites.push_back(Site);
+  }
+
+  // Final tallies.
+  unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
+                                            sizeof(int32_t) + // Site length.
+                                            sizeof(int32_t)); // Landing pad.
+  for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
+    SizeSites += AsmPrinter::SizeULEB128(CallSites[i].Action);
+
+  unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
+
+  unsigned TypeOffset = sizeof(int8_t) + // Call site format
+                        // Call-site table length
+                        AsmPrinter::SizeULEB128(SizeSites) + 
+                        SizeSites + SizeActions + SizeTypes;
+
+  unsigned TotalSize = sizeof(int8_t) + // LPStart format
+                       sizeof(int8_t) + // TType format
+                       AsmPrinter::SizeULEB128(TypeOffset) + // TType base offset
+                       TypeOffset;
+
+  unsigned SizeAlign = (4 - TotalSize) & 3;
+
+  // Begin the exception table.
+  MCE->emitAlignment(4);
+  for (unsigned i = 0; i != SizeAlign; ++i) {
+    MCE->emitByte(0);
+    // Asm->EOL("Padding");
+  }
+  
+  unsigned char* DwarfExceptionTable = (unsigned char*)MCE->getCurrentPCValue();
+
+  // Emit the header.
+  MCE->emitByte(dwarf::DW_EH_PE_omit);
+  // Asm->EOL("LPStart format (DW_EH_PE_omit)");
+  MCE->emitByte(dwarf::DW_EH_PE_absptr);
+  // Asm->EOL("TType format (DW_EH_PE_absptr)");
+  MCE->emitULEB128Bytes(TypeOffset);
+  // Asm->EOL("TType base offset");
+  MCE->emitByte(dwarf::DW_EH_PE_udata4);
+  // Asm->EOL("Call site format (DW_EH_PE_udata4)");
+  MCE->emitULEB128Bytes(SizeSites);
+  // Asm->EOL("Call-site table length");
+
+  // Emit the landing pad site information.
+  for (unsigned i = 0; i < CallSites.size(); ++i) {
+    CallSiteEntry &S = CallSites[i];
+    intptr_t BeginLabelPtr = 0;
+    intptr_t EndLabelPtr = 0;
+
+    if (!S.BeginLabel) {
+      BeginLabelPtr = (intptr_t)StartFunction;
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32(0);
+      else
+        MCE->emitInt64(0);
+    } else {
+      BeginLabelPtr = MCE->getLabelAddress(S.BeginLabel);
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction);
+      else
+        MCE->emitInt64(BeginLabelPtr - (intptr_t)StartFunction);
+    }
+
+    // Asm->EOL("Region start");
+
+    if (!S.EndLabel) {
+      EndLabelPtr = (intptr_t)EndFunction;
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32((intptr_t)EndFunction - BeginLabelPtr);
+      else
+        MCE->emitInt64((intptr_t)EndFunction - BeginLabelPtr);
+    } else {
+      EndLabelPtr = MCE->getLabelAddress(S.EndLabel);
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32(EndLabelPtr - BeginLabelPtr);
+      else
+        MCE->emitInt64(EndLabelPtr - BeginLabelPtr);
+    }
+    //Asm->EOL("Region length");
+
+    if (!S.PadLabel) {
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32(0);
+      else
+        MCE->emitInt64(0);
+    } else {
+      unsigned PadLabelPtr = MCE->getLabelAddress(S.PadLabel);
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction);
+      else
+        MCE->emitInt64(PadLabelPtr - (intptr_t)StartFunction);
+    }
+    // Asm->EOL("Landing pad");
+
+    MCE->emitULEB128Bytes(S.Action);
+    // Asm->EOL("Action");
+  }
+
+  // Emit the actions.
+  for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
+    ActionEntry &Action = Actions[I];
+
+    MCE->emitSLEB128Bytes(Action.ValueForTypeID);
+    //Asm->EOL("TypeInfo index");
+    MCE->emitSLEB128Bytes(Action.NextAction);
+    //Asm->EOL("Next action");
+  }
+
+  // Emit the type ids.
+  for (unsigned M = TypeInfos.size(); M; --M) {
+    GlobalVariable *GV = TypeInfos[M - 1];
+    
+    if (GV) {
+      if (TD->getPointerSize() == sizeof(int32_t)) {
+        MCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV));
+      } else {
+        MCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV));
+      }
+    } else {
+      if (TD->getPointerSize() == sizeof(int32_t))
+        MCE->emitInt32(0);
+      else
+        MCE->emitInt64(0);
+    }
+    // Asm->EOL("TypeInfo");
+  }
+
+  // Emit the filter typeids.
+  for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
+    unsigned TypeID = FilterIds[j];
+    MCE->emitULEB128Bytes(TypeID);
+    //Asm->EOL("Filter TypeInfo index");
+  }
+  
+  MCE->emitAlignment(4);
+
+  return DwarfExceptionTable;
+}
+
+unsigned char* JITDwarfEmitter::EmitCommonEHFrame(const Function* Personality) {
+  unsigned PointerSize = TD->getPointerSize();
+  int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
+          PointerSize : -PointerSize;
+  
+  unsigned char* StartCommonPtr = (unsigned char*)MCE->getCurrentPCValue();
+  // EH Common Frame header
+  MCE->allocateSpace(PointerSize, 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));
+  
+  if (Personality) {
+    MCE->emitULEB128Bytes(7);
+    
+    if (needsIndirectEncoding)
+      MCE->emitByte(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 | 
+               dwarf::DW_EH_PE_indirect);
+    else
+      MCE->emitByte(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
+
+    if (PointerSize == 8)
+      MCE->emitInt64((intptr_t)Jit.getPointerToGlobal(Personality) - 
+                MCE->getCurrentPCValue());
+    else
+      MCE->emitInt32((intptr_t)Jit.getPointerToGlobal(Personality) - 
+                MCE->getCurrentPCValue());
+    
+    MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel);
+    MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel);
+      
+  } else {
+    MCE->emitULEB128Bytes(1);
+    MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel);
+  }
+
+  std::vector<MachineMove> Moves;
+  RI->getInitialFrameState(Moves);
+  EmitFrameMoves(0, Moves);
+  MCE->emitAlignment(4);
+  
+  MCE->emitAt((uintptr_t*)StartCommonPtr, 
+              (uintptr_t)((unsigned char*)MCE->getCurrentPCValue() - 
+                          FrameCommonBeginPtr));
+
+  return StartCommonPtr;
+}
+
+
+unsigned char* JITDwarfEmitter::EmitEHFrame(const Function* Personality,
+                                            unsigned char* StartCommonPtr,
+                                            unsigned char* StartFunction, 
+                                            unsigned char* EndFunction,
+                                            unsigned char* ExceptionTable) {
+  unsigned PointerSize = TD->getPointerSize();
+  
+  // EH frame header.
+  unsigned char* StartEHPtr = (unsigned char*)MCE->getCurrentPCValue();
+  MCE->allocateSpace(PointerSize, 0);
+  unsigned char* FrameBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
+  // FDE CIE Offset
+  if (PointerSize == 8) {
+    MCE->emitInt64(FrameBeginPtr - StartCommonPtr);
+    MCE->emitInt64(StartFunction - (unsigned char*)MCE->getCurrentPCValue());
+    MCE->emitInt64(EndFunction - StartFunction);
+  } else {
+    MCE->emitInt32(FrameBeginPtr - StartCommonPtr);
+    MCE->emitInt32(StartFunction - (unsigned char*)MCE->getCurrentPCValue());
+    MCE->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);
+        
+    if (!MMI->getLandingPads().empty()) {
+      if (PointerSize == 8)
+        MCE->emitInt64(ExceptionTable - (unsigned char*)MCE->getCurrentPCValue());
+      else
+        MCE->emitInt32(ExceptionTable - (unsigned char*)MCE->getCurrentPCValue());
+    } else if (PointerSize == 8) {
+      MCE->emitInt64((int)0);
+    } else {
+      MCE->emitInt32((int)0);
+    }
+  } else {
+    MCE->emitULEB128Bytes(0);
+  }
+      
+  // Indicate locations of function specific  callee saved registers in
+  // frame.
+  EmitFrameMoves((intptr_t)StartFunction, MMI->getFrameMoves());
+      
+  MCE->emitAlignment(4);
+  
+  // Indicate the size of the table
+  MCE->emitAt((uintptr_t*)StartEHPtr, 
+              (uintptr_t)((unsigned char*)MCE->getCurrentPCValue() - 
+                          StartEHPtr));
+  
+  // Double zeroes for the unwind runtime
+  if (PointerSize == 8) {
+    MCE->emitInt64(0);
+    MCE->emitInt64(0);
+  } else {
+    MCE->emitInt32(0);
+    MCE->emitInt32(0);
+  }
+
+  
+  return StartEHPtr;
+}

lib/ExecutionEngine/JIT/JITDwarfEmitter.h

@@ -0,0 +1,69 @@
+//===------ JITDwarfEmitter.h - Write dwarf tables into memory ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a JITDwarfEmitter object that is used by the JIT to
+// write dwarf tables to memory.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTION_ENGINE_JIT_DWARFEMITTER_H
+#define LLVM_EXECUTION_ENGINE_JIT_DWARFEMITTER_H
+
+namespace llvm {
+
+class Function;
+class MachineCodeEmitter;
+class MachineFunction;
+class MachineModuleInfo;
+class MachineMove;
+class TargetData;
+class TargetMachine;
+class TargetRegisterInfo;
+
+class JITDwarfEmitter {
+  const TargetData* TD;
+  MachineCodeEmitter* MCE;
+  const TargetRegisterInfo* RI;
+  MachineModuleInfo* MMI;
+  JIT& Jit;
+  bool needsIndirectEncoding;
+  bool stackGrowthDirection;
+  
+public:
+  JITDwarfEmitter(JIT& jit);
+
+  unsigned char* EmitExceptionTable(MachineFunction* MF,
+                                    unsigned char* StartFunction, 
+                                    unsigned char* EndFunction);
+
+  void EmitFrameMoves(intptr_t BaseLabelPtr, 
+                      const std::vector<MachineMove> &Moves);
+    
+  unsigned char* EmitCommonEHFrame(const Function* Personality);
+
+  unsigned char* EmitEHFrame(const Function* Personality, 
+                             unsigned char* StartBufferPtr,
+                             unsigned char* StartFunction, 
+                             unsigned char* EndFunction,
+                             unsigned char* ExceptionTable);
+    
+
+  unsigned char* EmitDwarfTable(MachineFunction& F, 
+                                MachineCodeEmitter& MCE,
+                                unsigned char* StartFunction,
+                                unsigned char* EndFunction);
+  
+  void setModuleInfo(MachineModuleInfo* Info) {
+    MMI = Info;
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_EXECUTION_ENGINE_JIT_DWARFEMITTER_H

lib/ExecutionEngine/JIT/JITEmitter.cpp

@@ -14,6 +14,7 @@
 
 #define DEBUG_TYPE "jit"
 #include "JIT.h"
+#include "JITDwarfEmitter.h"
 #include "llvm/Constant.h"
 #include "llvm/Module.h"
 #include "llvm/Type.h"
@@ -21,11 +22,13 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineRelocation.h"
 #include "llvm/ExecutionEngine/JITMemoryManager.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetJITInfo.h"
 #include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/MutexGuard.h"
 #include "llvm/System/Disassembler.h"
@@ -336,6 +339,17 @@ namespace {
 
     /// Resolver - This contains info about the currently resolved functions.
     JITResolver Resolver;
+    
+    /// DE - The dwarf emitter for the jit.
+    JITDwarfEmitter *DE;
+
+    /// LabelLocations - This vector is a mapping from Label ID's to their 
+    /// address.
+    std::vector<intptr_t> LabelLocations;
+
+    /// MMI - Machine module info for exception informations
+    MachineModuleInfo* MMI;
+
   public:
     JITEmitter(JIT &jit, JITMemoryManager *JMM) : Resolver(jit) {
       MemMgr = JMM ? JMM : JITMemoryManager::CreateDefaultMemManager();
@@ -343,9 +357,12 @@ namespace {
         MemMgr->AllocateGOT();
         DOUT << "JIT is managing a GOT\n";
       }
+
+      if (ExceptionHandling) DE = new JITDwarfEmitter(jit);
     }
     ~JITEmitter() { 
       delete MemMgr;
+      if (ExceptionHandling) delete DE;
     }
     
     JITResolver &getJITResolver() { return Resolver; }
@@ -384,6 +401,24 @@ namespace {
     void deallocateMemForFunction(Function *F) {
       MemMgr->deallocateMemForFunction(F);
     }
+    
+    virtual void emitLabel(uint64_t LabelID) {
+      if (LabelLocations.size() <= LabelID)
+        LabelLocations.resize((LabelID+1)*2);
+      LabelLocations[LabelID] = getCurrentPCValue();
+    }
+
+    virtual intptr_t getLabelAddress(uint64_t LabelID) const {
+      assert(LabelLocations.size() > (unsigned)LabelID && 
+             LabelLocations[LabelID] && "Label not emitted!");
+      return LabelLocations[LabelID];
+    }
+ 
+    virtual void setModuleInfo(MachineModuleInfo* Info) {
+      MMI = Info;
+      if (ExceptionHandling) DE->setModuleInfo(Info);
+    }
+
   private:
     void *getPointerToGlobal(GlobalValue *GV, void *Reference, bool NoNeedStub);
     void *getPointerToGVLazyPtr(GlobalValue *V, void *Reference,
@@ -544,7 +579,25 @@ bool JITEmitter::finishFunction(MachineFunction &F) {
     DOUT << "Disassembled code:\n"
          << sys::disassembleBuffer(FnStart, FnEnd-FnStart, (uintptr_t)FnStart);
 #endif
-  
+  if (ExceptionHandling) {
+    uintptr_t ActualSize;
+    SavedBufferBegin = BufferBegin;
+    SavedBufferEnd = BufferEnd;
+    SavedCurBufferPtr = CurBufferPtr;
+
+    BufferBegin = CurBufferPtr = MemMgr->startExceptionTable(F.getFunction(),
+                                                             ActualSize);
+    BufferEnd = BufferBegin+ActualSize;
+    unsigned char* FrameRegister = DE->EmitDwarfTable(F, *this, FnStart, FnEnd);
+    MemMgr->endExceptionTable(F.getFunction(), BufferBegin, CurBufferPtr, FrameRegister);
+    BufferBegin = SavedBufferBegin;
+    BufferEnd = SavedBufferEnd;
+    CurBufferPtr = SavedCurBufferPtr;
+
+    TheJIT->RegisterTable(FrameRegister);
+  }
+  MMI->EndFunction();
+ 
   return false;
 }
 

lib/ExecutionEngine/JIT/JITMemoryManager.cpp

@@ -256,6 +256,7 @@ namespace {
     sys::MemoryBlock getNewMemoryBlock(unsigned size);
     
     std::map<const Function*, MemoryRangeHeader*> FunctionBlocks;
+    std::map<const Function*, MemoryRangeHeader*> TableBlocks;
   public:
     DefaultJITMemoryManager();
     ~DefaultJITMemoryManager();
@@ -290,6 +291,28 @@ namespace {
       FreeMemoryList =CurBlock->TrimAllocationToSize(FreeMemoryList, BlockSize);
     }
     
+    /// startExceptionTable - Use startFunctionBody to allocate memory for the 
+    /// function's exception table.
+    unsigned char* startExceptionTable(const Function* F, uintptr_t &ActualSize) {
+      return startFunctionBody(F, ActualSize);
+    }
+
+    /// endExceptionTable - The exception table of F is now allocated, 
+    /// and takes the memory in the range [TableStart,TableEnd).
+    void endExceptionTable(const Function *F, unsigned char *TableStart,
+                           unsigned char *TableEnd, 
+                           unsigned char* FrameRegister) {
+      assert(TableEnd > TableStart);
+      assert(TableStart == (unsigned char *)(CurBlock+1) &&
+             "Mismatched table start/end!");
+      
+      uintptr_t BlockSize = TableEnd - (unsigned char *)CurBlock;
+      TableBlocks[F] = CurBlock;
+
+      // Release the memory at the end of this block that isn't needed.
+      FreeMemoryList =CurBlock->TrimAllocationToSize(FreeMemoryList, BlockSize);
+    }
+    
     unsigned char *getGOTBase() const {
       return GOTBase;
     }
@@ -315,6 +338,24 @@ namespace {
       
       // Finally, remove this entry from FunctionBlocks.
       FunctionBlocks.erase(I);
+      
+      I = TableBlocks.find(F);
+      if (I == TableBlocks.end()) return;
+      
+      // Find the block that is allocated for this function.
+      MemRange = I->second;
+      assert(MemRange->ThisAllocated && "Block isn't allocated!");
+      
+      // Fill the buffer with garbage!
+#ifndef NDEBUG
+      memset(MemRange+1, 0xCD, MemRange->BlockSize-sizeof(*MemRange));
+#endif
+      
+      // Free the memory.
+      FreeMemoryList = MemRange->FreeBlock(FreeMemoryList);
+      
+      // Finally, remove this entry from TableBlocks.
+      TableBlocks.erase(I);
     }
   };
 }

lib/Target/PowerPC/PPCCodeEmitter.cpp

@@ -20,6 +20,7 @@
 #include "llvm/CodeGen/MachineCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Support/Debug.h"                   
 #include "llvm/Support/Compiler.h"
@@ -38,6 +39,11 @@ namespace {
     /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
     ///
     int getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
+    
+    void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.addRequired<MachineModuleInfo>();
+      MachineFunctionPass::getAnalysisUsage(AU);
+    }
 
   public:
     static char ID;
@@ -82,6 +88,8 @@ bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
   assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
           MF.getTarget().getRelocationModel() != Reloc::Static) &&
          "JIT relocation model must be set to static or default!");
+
+  MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
   do {
     MovePCtoLROffset = 0;
     MCE.startFunction(MF);
@@ -101,6 +109,9 @@ void PPCCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
     default:
       MCE.emitWordBE(getBinaryCodeForInstr(*I));
       break;
+    case TargetInstrInfo::LABEL:
+      MCE.emitLabel(MI.getOperand(0).getImm());
+      break;
     case PPC::IMPLICIT_DEF_GPRC:
     case PPC::IMPLICIT_DEF_G8RC:
     case PPC::IMPLICIT_DEF_F8:

lib/Target/X86/X86CodeEmitter.cpp

@@ -23,6 +23,7 @@
 #include "llvm/CodeGen/MachineCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Function.h"
 #include "llvm/ADT/Statistic.h"
@@ -61,6 +62,11 @@ namespace {
 
     void emitInstruction(const MachineInstr &MI,
                          const TargetInstrDesc *Desc);
+    
+    void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.addRequired<MachineModuleInfo>();
+      MachineFunctionPass::getAnalysisUsage(AU);
+    }
 
   private:
     void emitPCRelativeBlockAddress(MachineBasicBlock *MBB);
@@ -104,10 +110,13 @@ bool Emitter::runOnMachineFunction(MachineFunction &MF) {
   assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
           MF.getTarget().getRelocationModel() != Reloc::Static) &&
          "JIT relocation model must be set to static or default!");
+  
+  MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
+  
   II = ((X86TargetMachine&)TM).getInstrInfo();
   TD = ((X86TargetMachine&)TM).getTargetData();
   Is64BitMode = TM.getSubtarget<X86Subtarget>().is64Bit();
-
+  
   do {
     MCE.startFunction(MF);
     for (MachineFunction::iterator MBB = MF.begin(), E = MF.end(); 
@@ -596,13 +605,13 @@ void Emitter::emitInstruction(const MachineInstr &MI,
     // Remember the current PC offset, this is the PIC relocation
     // base address.
     switch (Opcode) {
-#ifndef NDEBUG
     default: 
       assert(0 && "psuedo instructions should be removed before code emission");
     case TargetInstrInfo::INLINEASM:
       assert(0 && "JIT does not support inline asm!\n");
     case TargetInstrInfo::LABEL:
-      assert(0 && "JIT does not support meta labels!\n");
+      MCE.emitLabel(MI.getOperand(0).getImm());
+      break;
     case X86::IMPLICIT_DEF_GR8:
     case X86::IMPLICIT_DEF_GR16:
     case X86::IMPLICIT_DEF_GR32:
@@ -613,7 +622,6 @@ void Emitter::emitInstruction(const MachineInstr &MI,
     case X86::IMPLICIT_DEF_VR128:
     case X86::FP_REG_KILL:
       break;
-#endif
     case X86::MOVPC32r: {
       // This emits the "call" portion of this pseudo instruction.
       MCE.emitByte(BaseOpcode);
@@ -627,7 +635,6 @@ void Emitter::emitInstruction(const MachineInstr &MI,
     }
     CurOp = NumOps;
     break;
-
   case X86II::RawFrm:
     MCE.emitByte(BaseOpcode);