lib/CodeGen/MachineFunction.cpp - fp2-dev/platform/external/llvm - Gitiles

 //===-- MachineFunction.cpp -----------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Collect native machine code information for a function.  This allows
 // target-specific information about the generated code to be stored with each
 // function.
 //
 //===----------------------------------------------------------------------===//

 #include "llvm/DerivedTypes.h"
 #include "llvm/Function.h"
 #include "llvm/Instructions.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Config/config.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetLowering.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetFrameInfo.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/GraphWriter.h"
 #include "llvm/Support/raw_ostream.h"
 #include <fstream>
 #include <sstream>
 using namespace llvm;

 namespace {
   struct VISIBILITY_HIDDEN Printer : public MachineFunctionPass {
     static char ID;

     std::ostream *OS;
     const std::string Banner;

     Printer (std::ostream *os, const std::string &banner)
       : MachineFunctionPass(&ID), OS(os), Banner(banner) {}

     const char *getPassName() const { return "MachineFunction Printer"; }

     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesAll();
       MachineFunctionPass::getAnalysisUsage(AU);
     }

     bool runOnMachineFunction(MachineFunction &MF) {
       (*OS) << Banner;
       MF.print (*OS);
       return false;
     }
   };
   char Printer::ID = 0;
 }

 /// Returns a newly-created MachineFunction Printer pass. The default banner is
 /// empty.
 ///
 FunctionPass *llvm::createMachineFunctionPrinterPass(std::ostream *OS,
                                                      const std::string &Banner){
   return new Printer(OS, Banner);
 }

 //===---------------------------------------------------------------------===//
 // MachineFunction implementation
 //===---------------------------------------------------------------------===//

 void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
   MBB->getParent()->DeleteMachineBasicBlock(MBB);
 }

 MachineFunction::MachineFunction(Function *F,
                                  const TargetMachine &TM)
   : Fn(F), Target(TM) {
   if (TM.getRegisterInfo())
     RegInfo = new (Allocator.Allocate<MachineRegisterInfo>())
                   MachineRegisterInfo(*TM.getRegisterInfo());
   else
     RegInfo = 0;
   MFInfo = 0;
   FrameInfo = new (Allocator.Allocate<MachineFrameInfo>())
                   MachineFrameInfo(*TM.getFrameInfo());
   ConstantPool = new (Allocator.Allocate<MachineConstantPool>())
                      MachineConstantPool(TM.getTargetData());
   Alignment = TM.getTargetLowering()->getFunctionAlignment(F);

   CallSiteIndex = 0;
   MaxCallSiteIndex = 0;

   // Set up jump table.
   const TargetData &TD = *TM.getTargetData();
   bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
   unsigned EntrySize = IsPic ? 4 : TD.getPointerSize();
   unsigned TyAlignment = IsPic ? TD.getABITypeAlignment(Type::Int32Ty)
                                : TD.getPointerABIAlignment();
   JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>())
                       MachineJumpTableInfo(EntrySize, TyAlignment);
 }

 MachineFunction::~MachineFunction() {
   BasicBlocks.clear();
   InstructionRecycler.clear(Allocator);
   BasicBlockRecycler.clear(Allocator);
   if (RegInfo) {
     RegInfo->~MachineRegisterInfo();
     Allocator.Deallocate(RegInfo);
   }
   if (MFInfo) {
     MFInfo->~MachineFunctionInfo();
     Allocator.Deallocate(MFInfo);
   }
   FrameInfo->~MachineFrameInfo();         Allocator.Deallocate(FrameInfo);
   ConstantPool->~MachineConstantPool();   Allocator.Deallocate(ConstantPool);
   JumpTableInfo->~MachineJumpTableInfo(); Allocator.Deallocate(JumpTableInfo);
 }


 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
 /// recomputes them.  This guarantees that the MBB numbers are sequential,
 /// dense, and match the ordering of the blocks within the function.  If a
 /// specific MachineBasicBlock is specified, only that block and those after
 /// it are renumbered.
 void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
   if (empty()) { MBBNumbering.clear(); return; }
   MachineFunction::iterator MBBI, E = end();
   if (MBB == 0)
     MBBI = begin();
   else
     MBBI = MBB;

   // Figure out the block number this should have.
   unsigned BlockNo = 0;
   if (MBBI != begin())
     BlockNo = prior(MBBI)->getNumber()+1;

   for (; MBBI != E; ++MBBI, ++BlockNo) {
     if (MBBI->getNumber() != (int)BlockNo) {
       // Remove use of the old number.
       if (MBBI->getNumber() != -1) {
         assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
                "MBB number mismatch!");
         MBBNumbering[MBBI->getNumber()] = 0;
       }

       // If BlockNo is already taken, set that block's number to -1.
       if (MBBNumbering[BlockNo])
         MBBNumbering[BlockNo]->setNumber(-1);

       MBBNumbering[BlockNo] = MBBI;
       MBBI->setNumber(BlockNo);
     }
   }

   // Okay, all the blocks are renumbered.  If we have compactified the block
   // numbering, shrink MBBNumbering now.
   assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
   MBBNumbering.resize(BlockNo);
 }

 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
 /// of `new MachineInstr'.
 ///
 MachineInstr *
 MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID,
                                     DebugLoc DL, bool NoImp) {
   return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
     MachineInstr(TID, DL, NoImp);
 }

 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
 /// 'Orig' instruction, identical in all ways except the the instruction
 /// has no parent, prev, or next.
 ///
 MachineInstr *
 MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
   return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
              MachineInstr(*this, *Orig);
 }

 /// DeleteMachineInstr - Delete the given MachineInstr.
 ///
 void
 MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
   // Clear the instructions memoperands. This must be done manually because
   // the instruction's parent pointer is now null, so it can't properly
   // deallocate them on its own.
   MI->clearMemOperands(*this);

   MI->~MachineInstr();
   InstructionRecycler.Deallocate(Allocator, MI);
 }

 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
 /// instead of `new MachineBasicBlock'.
 ///
 MachineBasicBlock *
 MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
   return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
              MachineBasicBlock(*this, bb);
 }

 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
 ///
 void
 MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
   assert(MBB->getParent() == this && "MBB parent mismatch!");
   MBB->~MachineBasicBlock();
   BasicBlockRecycler.Deallocate(Allocator, MBB);
 }

 void MachineFunction::dump() const {
   print(*cerr.stream());
 }

 void MachineFunction::print(std::ostream &OS,
                             const PrefixPrinter &prefix) const {
   OS << "# Machine code for " << Fn->getNameStr () << "():\n";

   // Print Frame Information
   FrameInfo->print(*this, OS);

   // Print JumpTable Information
   JumpTableInfo->print(OS);

   // Print Constant Pool
   {
     raw_os_ostream OSS(OS);
     ConstantPool->print(OSS);
   }

   const TargetRegisterInfo *TRI = getTarget().getRegisterInfo();

   if (RegInfo && !RegInfo->livein_empty()) {
     OS << "Live Ins:";
     for (MachineRegisterInfo::livein_iterator
          I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) {
       if (TRI)
         OS << " " << TRI->getName(I->first);
       else
         OS << " Reg #" << I->first;

       if (I->second)
         OS << " in VR#" << I->second << " ";
     }
     OS << "\n";
   }
   if (RegInfo && !RegInfo->liveout_empty()) {
     OS << "Live Outs:";
     for (MachineRegisterInfo::liveout_iterator
          I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I)
       if (TRI)
         OS << " " << TRI->getName(*I);
       else
         OS << " Reg #" << *I;
     OS << "\n";
   }

   for (const_iterator BB = begin(); BB != end(); ++BB) {
     prefix(OS, *BB);
     BB->print(OS, prefix);
   }

   OS << "\n# End machine code for " << Fn->getNameStr () << "().\n\n";
 }

 namespace llvm {
   template<>
   struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
     static std::string getGraphName(const MachineFunction *F) {
       return "CFG for '" + F->getFunction()->getNameStr() + "' function";
     }

     static std::string getNodeLabel(const MachineBasicBlock *Node,
                                     const MachineFunction *Graph,
                                     bool ShortNames) {
       if (ShortNames && Node->getBasicBlock() &&
           !Node->getBasicBlock()->getName().empty())
         return Node->getBasicBlock()->getNameStr() + ":";

       std::ostringstream Out;
       if (ShortNames) {
         Out << Node->getNumber() << ':';
         return Out.str();
       }

       Node->print(Out);

       std::string OutStr = Out.str();
       if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());

       // Process string output to make it nicer...
       for (unsigned i = 0; i != OutStr.length(); ++i)
         if (OutStr[i] == '\n') {                            // Left justify
           OutStr[i] = '\\';
           OutStr.insert(OutStr.begin()+i+1, 'l');
         }
       return OutStr;
     }
   };
 }

 void MachineFunction::viewCFG() const
 {
 #ifndef NDEBUG
   ViewGraph(this, "mf" + getFunction()->getNameStr());
 #else
   cerr << "SelectionDAG::viewGraph is only available in debug builds on "
        << "systems with Graphviz or gv!\n";
 #endif // NDEBUG
 }

 void MachineFunction::viewCFGOnly() const
 {
 #ifndef NDEBUG
   ViewGraph(this, "mf" + getFunction()->getNameStr(), true);
 #else
   cerr << "SelectionDAG::viewGraph is only available in debug builds on "
        << "systems with Graphviz or gv!\n";
 #endif // NDEBUG
 }

 /// addLiveIn - Add the specified physical register as a live-in value and
 /// create a corresponding virtual register for it.
 unsigned MachineFunction::addLiveIn(unsigned PReg,
                                     const TargetRegisterClass *RC) {
   assert(RC->contains(PReg) && "Not the correct regclass!");
   unsigned VReg = getRegInfo().createVirtualRegister(RC);
   getRegInfo().addLiveIn(PReg, VReg);
   return VReg;
 }

 /// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
 /// source file, line, and column. If none currently exists, create a new
 /// DebugLocTuple, and insert it into the DebugIdMap.
 unsigned MachineFunction::getOrCreateDebugLocID(GlobalVariable *CompileUnit,
                                                 unsigned Line, unsigned Col) {
   DebugLocTuple Tuple(CompileUnit, Line, Col);
   DenseMap<DebugLocTuple, unsigned>::iterator II
     = DebugLocInfo.DebugIdMap.find(Tuple);
   if (II != DebugLocInfo.DebugIdMap.end())
     return II->second;
   // Add a new tuple.
   unsigned Id = DebugLocInfo.DebugLocations.size();
   DebugLocInfo.DebugLocations.push_back(Tuple);
   DebugLocInfo.DebugIdMap[Tuple] = Id;
   return Id;
 }

 /// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
 DebugLocTuple MachineFunction::getDebugLocTuple(DebugLoc DL) const {
   unsigned Idx = DL.getIndex();
   assert(Idx < DebugLocInfo.DebugLocations.size() &&
          "Invalid index into debug locations!");
   return DebugLocInfo.DebugLocations[Idx];
 }

 //===----------------------------------------------------------------------===//
 //  MachineFrameInfo implementation
 //===----------------------------------------------------------------------===//

 /// CreateFixedObject - Create a new object at a fixed location on the stack.
 /// All fixed objects should be created before other objects are created for
 /// efficiency. By default, fixed objects are immutable. This returns an
 /// index with a negative value.
 ///
 int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
                                         bool Immutable) {
   assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
   Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable));
   return -++NumFixedObjects;
 }


 void MachineFrameInfo::print(const MachineFunction &MF, std::ostream &OS) const{
   const TargetFrameInfo *FI = MF.getTarget().getFrameInfo();
   int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);

   for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
     const StackObject &SO = Objects[i];
     OS << "  <fi#" << (int)(i-NumFixedObjects) << ">: ";
     if (SO.Size == ~0ULL) {
       OS << "dead\n";
       continue;
     }
     if (SO.Size == 0)
       OS << "variable sized";
     else
       OS << "size is " << SO.Size << " byte" << (SO.Size != 1 ? "s," : ",");
     OS << " alignment is " << SO.Alignment << " byte"
        << (SO.Alignment != 1 ? "s," : ",");

     if (i < NumFixedObjects)
       OS << " fixed";
     if (i < NumFixedObjects || SO.SPOffset != -1) {
       int64_t Off = SO.SPOffset - ValOffset;
       OS << " at location [SP";
       if (Off > 0)
         OS << "+" << Off;
       else if (Off < 0)
         OS << Off;
       OS << "]";
     }
     OS << "\n";
   }

   if (HasVarSizedObjects)
     OS << "  Stack frame contains variable sized objects\n";
 }

 void MachineFrameInfo::dump(const MachineFunction &MF) const {
   print(MF, *cerr.stream());
 }


 //===----------------------------------------------------------------------===//
 //  MachineJumpTableInfo implementation
 //===----------------------------------------------------------------------===//

 /// getJumpTableIndex - Create a new jump table entry in the jump table info
 /// or return an existing one.
 ///
 unsigned MachineJumpTableInfo::getJumpTableIndex(
                                const std::vector<MachineBasicBlock*> &DestBBs) {
   assert(!DestBBs.empty() && "Cannot create an empty jump table!");
   for (unsigned i = 0, e = JumpTables.size(); i != e; ++i)
     if (JumpTables[i].MBBs == DestBBs)
       return i;

   JumpTables.push_back(MachineJumpTableEntry(DestBBs));
   return JumpTables.size()-1;
 }

 /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
 /// the jump tables to branch to New instead.
 bool
 MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
                                              MachineBasicBlock *New) {
   assert(Old != New && "Not making a change?");
   bool MadeChange = false;
   for (size_t i = 0, e = JumpTables.size(); i != e; ++i) {
     MachineJumpTableEntry &JTE = JumpTables[i];
     for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
       if (JTE.MBBs[j] == Old) {
         JTE.MBBs[j] = New;
         MadeChange = true;
       }
   }
   return MadeChange;
 }

 void MachineJumpTableInfo::print(std::ostream &OS) const {
   // FIXME: this is lame, maybe we could print out the MBB numbers or something
   // like {1, 2, 4, 5, 3, 0}
   for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
     OS << "  <jt#" << i << "> has " << JumpTables[i].MBBs.size()
        << " entries\n";
   }
 }

 void MachineJumpTableInfo::dump() const { print(*cerr.stream()); }


 //===----------------------------------------------------------------------===//
 //  MachineConstantPool implementation
 //===----------------------------------------------------------------------===//

 const Type *MachineConstantPoolEntry::getType() const {
   if (isMachineConstantPoolEntry())
     return Val.MachineCPVal->getType();
   return Val.ConstVal->getType();
 }


 unsigned MachineConstantPoolEntry::getRelocationInfo() const {
   if (isMachineConstantPoolEntry())
     return Val.MachineCPVal->getRelocationInfo();
   return Val.ConstVal->getRelocationInfo();
 }

 MachineConstantPool::~MachineConstantPool() {
   for (unsigned i = 0, e = Constants.size(); i != e; ++i)
     if (Constants[i].isMachineConstantPoolEntry())
       delete Constants[i].Val.MachineCPVal;
 }

 /// getConstantPoolIndex - Create a new entry in the constant pool or return
 /// an existing one.  User must specify the log2 of the minimum required
 /// alignment for the object.
 ///
 unsigned MachineConstantPool::getConstantPoolIndex(Constant *C,
                                                    unsigned Alignment) {
   assert(Alignment && "Alignment must be specified!");
   if (Alignment > PoolAlignment) PoolAlignment = Alignment;

   // Check to see if we already have this constant.
   //
   // FIXME, this could be made much more efficient for large constant pools.
   for (unsigned i = 0, e = Constants.size(); i != e; ++i)
     if (Constants[i].Val.ConstVal == C &&
         (Constants[i].getAlignment() & (Alignment - 1)) == 0)
       return i;

   Constants.push_back(MachineConstantPoolEntry(C, Alignment));
   return Constants.size()-1;
 }

 unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
                                                    unsigned Alignment) {
   assert(Alignment && "Alignment must be specified!");
   if (Alignment > PoolAlignment) PoolAlignment = Alignment;

   // Check to see if we already have this constant.
   //
   // FIXME, this could be made much more efficient for large constant pools.
   int Idx = V->getExistingMachineCPValue(this, Alignment);
   if (Idx != -1)
     return (unsigned)Idx;

   Constants.push_back(MachineConstantPoolEntry(V, Alignment));
   return Constants.size()-1;
 }

 void MachineConstantPool::print(raw_ostream &OS) const {
   for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
     OS << "  <cp#" << i << "> is";
     if (Constants[i].isMachineConstantPoolEntry())
       Constants[i].Val.MachineCPVal->print(OS);
     else
       OS << *(Value*)Constants[i].Val.ConstVal;
     OS << " , alignment=" << Constants[i].getAlignment();
     OS << "\n";
   }
 }

 void MachineConstantPool::dump() const { print(errs()); }
	//===-- MachineFunction.cpp -----------------------------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// Collect native machine code information for a function. This allows
	// target-specific information about the generated code to be stored with each
	// function.
	//
	//===----------------------------------------------------------------------===//

	#include "llvm/DerivedTypes.h"
	#include "llvm/Function.h"
	#include "llvm/Instructions.h"
	#include "llvm/ADT/STLExtras.h"
	#include "llvm/Config/config.h"
	#include "llvm/CodeGen/MachineConstantPool.h"
	#include "llvm/CodeGen/MachineFunctionPass.h"
	#include "llvm/CodeGen/MachineFrameInfo.h"
	#include "llvm/CodeGen/MachineInstr.h"
	#include "llvm/CodeGen/MachineJumpTableInfo.h"
	#include "llvm/CodeGen/MachineRegisterInfo.h"
	#include "llvm/CodeGen/Passes.h"
	#include "llvm/Target/TargetData.h"
	#include "llvm/Target/TargetLowering.h"
	#include "llvm/Target/TargetMachine.h"
	#include "llvm/Target/TargetFrameInfo.h"
	#include "llvm/Support/Compiler.h"
	#include "llvm/Support/GraphWriter.h"
	#include "llvm/Support/raw_ostream.h"
	#include <fstream>
	#include <sstream>
	using namespace llvm;

	namespace {
	struct VISIBILITY_HIDDEN Printer : public MachineFunctionPass {
	static char ID;

	std::ostream *OS;
	const std::string Banner;

	Printer (std::ostream *os, const std::string &banner)
	: MachineFunctionPass(&ID), OS(os), Banner(banner) {}

	const char *getPassName() const { return "MachineFunction Printer"; }

	virtual void getAnalysisUsage(AnalysisUsage &AU) const {
	AU.setPreservesAll();
	MachineFunctionPass::getAnalysisUsage(AU);
	}

	bool runOnMachineFunction(MachineFunction &MF) {
	(*OS) << Banner;
	MF.print (*OS);
	return false;
	}
	};
	char Printer::ID = 0;
	}

	/// Returns a newly-created MachineFunction Printer pass. The default banner is
	/// empty.
	///
	FunctionPass llvm::createMachineFunctionPrinterPass(std::ostream OS,
	const std::string &Banner){
	return new Printer(OS, Banner);
	}

	//===---------------------------------------------------------------------===//
	// MachineFunction implementation
	//===---------------------------------------------------------------------===//

	void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
	MBB->getParent()->DeleteMachineBasicBlock(MBB);
	}

	MachineFunction::MachineFunction(Function *F,
	const TargetMachine &TM)
	: Fn(F), Target(TM) {
	if (TM.getRegisterInfo())
	RegInfo = new (Allocator.Allocate<MachineRegisterInfo>())
	MachineRegisterInfo(*TM.getRegisterInfo());
	else
	RegInfo = 0;
	MFInfo = 0;
	FrameInfo = new (Allocator.Allocate<MachineFrameInfo>())
	MachineFrameInfo(*TM.getFrameInfo());
	ConstantPool = new (Allocator.Allocate<MachineConstantPool>())
	MachineConstantPool(TM.getTargetData());
	Alignment = TM.getTargetLowering()->getFunctionAlignment(F);

	CallSiteIndex = 0;
	MaxCallSiteIndex = 0;

	// Set up jump table.
	const TargetData &TD = *TM.getTargetData();
	bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
	unsigned EntrySize = IsPic ? 4 : TD.getPointerSize();
	unsigned TyAlignment = IsPic ? TD.getABITypeAlignment(Type::Int32Ty)
	: TD.getPointerABIAlignment();
	JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>())
	MachineJumpTableInfo(EntrySize, TyAlignment);
	}

	MachineFunction::~MachineFunction() {
	BasicBlocks.clear();
	InstructionRecycler.clear(Allocator);
	BasicBlockRecycler.clear(Allocator);
	if (RegInfo) {
	RegInfo->~MachineRegisterInfo();
	Allocator.Deallocate(RegInfo);
	}
	if (MFInfo) {
	MFInfo->~MachineFunctionInfo();
	Allocator.Deallocate(MFInfo);
	}
	FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo);
	ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool);
	JumpTableInfo->~MachineJumpTableInfo(); Allocator.Deallocate(JumpTableInfo);
	}


	/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
	/// recomputes them. This guarantees that the MBB numbers are sequential,
	/// dense, and match the ordering of the blocks within the function. If a
	/// specific MachineBasicBlock is specified, only that block and those after
	/// it are renumbered.
	void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
	if (empty()) { MBBNumbering.clear(); return; }
	MachineFunction::iterator MBBI, E = end();
	if (MBB == 0)
	MBBI = begin();
	else
	MBBI = MBB;

	// Figure out the block number this should have.
	unsigned BlockNo = 0;
	if (MBBI != begin())
	BlockNo = prior(MBBI)->getNumber()+1;

	for (; MBBI != E; ++MBBI, ++BlockNo) {
	if (MBBI->getNumber() != (int)BlockNo) {
	// Remove use of the old number.
	if (MBBI->getNumber() != -1) {
	assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
	"MBB number mismatch!");
	MBBNumbering[MBBI->getNumber()] = 0;
	}

	// If BlockNo is already taken, set that block's number to -1.
	if (MBBNumbering[BlockNo])
	MBBNumbering[BlockNo]->setNumber(-1);

	MBBNumbering[BlockNo] = MBBI;
	MBBI->setNumber(BlockNo);
	}
	}

	// Okay, all the blocks are renumbered. If we have compactified the block
	// numbering, shrink MBBNumbering now.
	assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
	MBBNumbering.resize(BlockNo);
	}

	/// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
	/// of `new MachineInstr'.
	///
	MachineInstr *
	MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID,
	DebugLoc DL, bool NoImp) {
	return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
	MachineInstr(TID, DL, NoImp);
	}

	/// CloneMachineInstr - Create a new MachineInstr which is a copy of the
	/// 'Orig' instruction, identical in all ways except the the instruction
	/// has no parent, prev, or next.
	///
	MachineInstr *
	MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
	return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
	MachineInstr(this, Orig);
	}

	/// DeleteMachineInstr - Delete the given MachineInstr.
	///
	void
	MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
	// Clear the instructions memoperands. This must be done manually because
	// the instruction's parent pointer is now null, so it can't properly
	// deallocate them on its own.
	MI->clearMemOperands(*this);

	MI->~MachineInstr();
	InstructionRecycler.Deallocate(Allocator, MI);
	}

	/// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
	/// instead of `new MachineBasicBlock'.
	///
	MachineBasicBlock *
	MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
	return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
	MachineBasicBlock(*this, bb);
	}

	/// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
	///
	void
	MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
	assert(MBB->getParent() == this && "MBB parent mismatch!");
	MBB->~MachineBasicBlock();
	BasicBlockRecycler.Deallocate(Allocator, MBB);
	}

	void MachineFunction::dump() const {
	print(*cerr.stream());
	}

	void MachineFunction::print(std::ostream &OS,
	const PrefixPrinter &prefix) const {
	OS << "# Machine code for " << Fn->getNameStr () << "():\n";

	// Print Frame Information
	FrameInfo->print(*this, OS);

	// Print JumpTable Information
	JumpTableInfo->print(OS);

	// Print Constant Pool
	{
	raw_os_ostream OSS(OS);
	ConstantPool->print(OSS);
	}

	const TargetRegisterInfo *TRI = getTarget().getRegisterInfo();

	if (RegInfo && !RegInfo->livein_empty()) {
	OS << "Live Ins:";
	for (MachineRegisterInfo::livein_iterator
	I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) {
	if (TRI)
	OS << " " << TRI->getName(I->first);
	else
	OS << " Reg #" << I->first;

	if (I->second)
	OS << " in VR#" << I->second << " ";
	}
	OS << "\n";
	}
	if (RegInfo && !RegInfo->liveout_empty()) {
	OS << "Live Outs:";
	for (MachineRegisterInfo::liveout_iterator
	I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I)
	if (TRI)
	OS << " " << TRI->getName(*I);
	else
	OS << " Reg #" << *I;
	OS << "\n";
	}

	for (const_iterator BB = begin(); BB != end(); ++BB) {
	prefix(OS, *BB);
	BB->print(OS, prefix);
	}

	OS << "\n# End machine code for " << Fn->getNameStr () << "().\n\n";
	}

	namespace llvm {
	template<>
	struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
	static std::string getGraphName(const MachineFunction *F) {
	return "CFG for '" + F->getFunction()->getNameStr() + "' function";
	}

	static std::string getNodeLabel(const MachineBasicBlock *Node,
	const MachineFunction *Graph,
	bool ShortNames) {
	if (ShortNames && Node->getBasicBlock() &&
	!Node->getBasicBlock()->getName().empty())
	return Node->getBasicBlock()->getNameStr() + ":";

	std::ostringstream Out;
	if (ShortNames) {
	Out << Node->getNumber() << ':';
	return Out.str();
	}

	Node->print(Out);

	std::string OutStr = Out.str();
	if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());

	// Process string output to make it nicer...
	for (unsigned i = 0; i != OutStr.length(); ++i)
	if (OutStr[i] == '\n') { // Left justify
	OutStr[i] = '\\';
	OutStr.insert(OutStr.begin()+i+1, 'l');
	}
	return OutStr;
	}
	};
	}

	void MachineFunction::viewCFG() const
	{
	#ifndef NDEBUG
	ViewGraph(this, "mf" + getFunction()->getNameStr());
	#else
	cerr << "SelectionDAG::viewGraph is only available in debug builds on "
	<< "systems with Graphviz or gv!\n";
	#endif // NDEBUG
	}

	void MachineFunction::viewCFGOnly() const
	{
	#ifndef NDEBUG
	ViewGraph(this, "mf" + getFunction()->getNameStr(), true);
	#else
	cerr << "SelectionDAG::viewGraph is only available in debug builds on "
	<< "systems with Graphviz or gv!\n";
	#endif // NDEBUG
	}

	/// addLiveIn - Add the specified physical register as a live-in value and
	/// create a corresponding virtual register for it.
	unsigned MachineFunction::addLiveIn(unsigned PReg,
	const TargetRegisterClass *RC) {
	assert(RC->contains(PReg) && "Not the correct regclass!");
	unsigned VReg = getRegInfo().createVirtualRegister(RC);
	getRegInfo().addLiveIn(PReg, VReg);
	return VReg;
	}

	/// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
	/// source file, line, and column. If none currently exists, create a new
	/// DebugLocTuple, and insert it into the DebugIdMap.
	unsigned MachineFunction::getOrCreateDebugLocID(GlobalVariable *CompileUnit,
	unsigned Line, unsigned Col) {
	DebugLocTuple Tuple(CompileUnit, Line, Col);
	DenseMap<DebugLocTuple, unsigned>::iterator II
	= DebugLocInfo.DebugIdMap.find(Tuple);
	if (II != DebugLocInfo.DebugIdMap.end())
	return II->second;
	// Add a new tuple.
	unsigned Id = DebugLocInfo.DebugLocations.size();
	DebugLocInfo.DebugLocations.push_back(Tuple);
	DebugLocInfo.DebugIdMap[Tuple] = Id;
	return Id;
	}

	/// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
	DebugLocTuple MachineFunction::getDebugLocTuple(DebugLoc DL) const {
	unsigned Idx = DL.getIndex();
	assert(Idx < DebugLocInfo.DebugLocations.size() &&
	"Invalid index into debug locations!");
	return DebugLocInfo.DebugLocations[Idx];
	}

	//===----------------------------------------------------------------------===//
	// MachineFrameInfo implementation
	//===----------------------------------------------------------------------===//

	/// CreateFixedObject - Create a new object at a fixed location on the stack.
	/// All fixed objects should be created before other objects are created for
	/// efficiency. By default, fixed objects are immutable. This returns an
	/// index with a negative value.
	///
	int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
	bool Immutable) {
	assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
	Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable));
	return -++NumFixedObjects;
	}


	void MachineFrameInfo::print(const MachineFunction &MF, std::ostream &OS) const{
	const TargetFrameInfo *FI = MF.getTarget().getFrameInfo();
	int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);

	for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
	const StackObject &SO = Objects[i];
	OS << " <fi#" << (int)(i-NumFixedObjects) << ">: ";
	if (SO.Size == ~0ULL) {
	OS << "dead\n";
	continue;
	}
	if (SO.Size == 0)
	OS << "variable sized";
	else
	OS << "size is " << SO.Size << " byte" << (SO.Size != 1 ? "s," : ",");
	OS << " alignment is " << SO.Alignment << " byte"
	<< (SO.Alignment != 1 ? "s," : ",");

	if (i < NumFixedObjects)
	OS << " fixed";
	if (i < NumFixedObjects \|\| SO.SPOffset != -1) {
	int64_t Off = SO.SPOffset - ValOffset;
	OS << " at location [SP";
	if (Off > 0)
	OS << "+" << Off;
	else if (Off < 0)
	OS << Off;
	OS << "]";
	}
	OS << "\n";
	}

	if (HasVarSizedObjects)
	OS << " Stack frame contains variable sized objects\n";
	}

	void MachineFrameInfo::dump(const MachineFunction &MF) const {
	print(MF, *cerr.stream());
	}


	//===----------------------------------------------------------------------===//
	// MachineJumpTableInfo implementation
	//===----------------------------------------------------------------------===//

	/// getJumpTableIndex - Create a new jump table entry in the jump table info
	/// or return an existing one.
	///
	unsigned MachineJumpTableInfo::getJumpTableIndex(
	const std::vector<MachineBasicBlock*> &DestBBs) {
	assert(!DestBBs.empty() && "Cannot create an empty jump table!");
	for (unsigned i = 0, e = JumpTables.size(); i != e; ++i)
	if (JumpTables[i].MBBs == DestBBs)
	return i;

	JumpTables.push_back(MachineJumpTableEntry(DestBBs));
	return JumpTables.size()-1;
	}

	/// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
	/// the jump tables to branch to New instead.
	bool
	MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
	MachineBasicBlock *New) {
	assert(Old != New && "Not making a change?");
	bool MadeChange = false;
	for (size_t i = 0, e = JumpTables.size(); i != e; ++i) {
	MachineJumpTableEntry &JTE = JumpTables[i];
	for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
	if (JTE.MBBs[j] == Old) {
	JTE.MBBs[j] = New;
	MadeChange = true;
	}
	}
	return MadeChange;
	}

	void MachineJumpTableInfo::print(std::ostream &OS) const {
	// FIXME: this is lame, maybe we could print out the MBB numbers or something
	// like {1, 2, 4, 5, 3, 0}
	for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
	OS << " <jt#" << i << "> has " << JumpTables[i].MBBs.size()
	<< " entries\n";
	}
	}

	void MachineJumpTableInfo::dump() const { print(*cerr.stream()); }


	//===----------------------------------------------------------------------===//
	// MachineConstantPool implementation
	//===----------------------------------------------------------------------===//

	const Type *MachineConstantPoolEntry::getType() const {
	if (isMachineConstantPoolEntry())
	return Val.MachineCPVal->getType();
	return Val.ConstVal->getType();
	}


	unsigned MachineConstantPoolEntry::getRelocationInfo() const {
	if (isMachineConstantPoolEntry())
	return Val.MachineCPVal->getRelocationInfo();
	return Val.ConstVal->getRelocationInfo();
	}

	MachineConstantPool::~MachineConstantPool() {
	for (unsigned i = 0, e = Constants.size(); i != e; ++i)
	if (Constants[i].isMachineConstantPoolEntry())
	delete Constants[i].Val.MachineCPVal;
	}

	/// getConstantPoolIndex - Create a new entry in the constant pool or return
	/// an existing one. User must specify the log2 of the minimum required
	/// alignment for the object.
	///
	unsigned MachineConstantPool::getConstantPoolIndex(Constant *C,
	unsigned Alignment) {
	assert(Alignment && "Alignment must be specified!");
	if (Alignment > PoolAlignment) PoolAlignment = Alignment;

	// Check to see if we already have this constant.
	//
	// FIXME, this could be made much more efficient for large constant pools.
	for (unsigned i = 0, e = Constants.size(); i != e; ++i)
	if (Constants[i].Val.ConstVal == C &&
	(Constants[i].getAlignment() & (Alignment - 1)) == 0)
	return i;

	Constants.push_back(MachineConstantPoolEntry(C, Alignment));
	return Constants.size()-1;
	}

	unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
	unsigned Alignment) {
	assert(Alignment && "Alignment must be specified!");
	if (Alignment > PoolAlignment) PoolAlignment = Alignment;

	// Check to see if we already have this constant.
	//
	// FIXME, this could be made much more efficient for large constant pools.
	int Idx = V->getExistingMachineCPValue(this, Alignment);
	if (Idx != -1)
	return (unsigned)Idx;

	Constants.push_back(MachineConstantPoolEntry(V, Alignment));
	return Constants.size()-1;
	}

	void MachineConstantPool::print(raw_ostream &OS) const {
	for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
	OS << " <cp#" << i << "> is";
	if (Constants[i].isMachineConstantPoolEntry())
	Constants[i].Val.MachineCPVal->print(OS);
	else
	OS << (Value)Constants[i].Val.ConstVal;
	OS << " , alignment=" << Constants[i].getAlignment();
	OS << "\n";
	}
	}

	void MachineConstantPool::dump() const { print(errs()); }