text: //===-- CodeGen/MachineFrameInfo.h - Abstract Stack Frame Rep. --*- C++ -*-===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // The file defines the MachineFrameInfo class.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_CODEGEN_MACHINEFRAMEINFO_H
  #define LLVM_CODEGEN_MACHINEFRAMEINFO_H
  
  #include "llvm/ADT/SmallVector.h"
  #include "llvm/Support/DataTypes.h"
  #include <cassert>
  #include <vector>
  
  namespace llvm {
  class raw_ostream;
  class DataLayout;
  class TargetRegisterClass;
  class Type;
  class MachineFunction;
  class MachineBasicBlock;
  class TargetFrameLowering;
  class TargetMachine;
  class BitVector;
  class Value;
  class AllocaInst;
  
  /// The CalleeSavedInfo class tracks the information need to locate where a
  /// callee saved register is in the current frame.
  class CalleeSavedInfo {
    unsigned Reg;
    int FrameIdx;
  
  public:
    explicit CalleeSavedInfo(unsigned R, int FI = 0)
    : Reg(R), FrameIdx(FI) {}
  
    // Accessors.
    unsigned getReg()                        const { return Reg; }
    int getFrameIdx()                        const { return FrameIdx; }
    void setFrameIdx(int FI)                       { FrameIdx = FI; }
  };
  
  /// The MachineFrameInfo class represents an abstract stack frame until
  /// prolog/epilog code is inserted.  This class is key to allowing stack frame
  /// representation optimizations, such as frame pointer elimination.  It also
  /// allows more mundane (but still important) optimizations, such as reordering
  /// of abstract objects on the stack frame.
  ///
  /// To support this, the class assigns unique integer identifiers to stack
  /// objects requested clients.  These identifiers are negative integers for
  /// fixed stack objects (such as arguments passed on the stack) or nonnegative
  /// for objects that may be reordered.  Instructions which refer to stack
  /// objects use a special MO_FrameIndex operand to represent these frame
  /// indexes.
  ///
  /// Because this class keeps track of all references to the stack frame, it
  /// knows when a variable sized object is allocated on the stack.  This is the
  /// sole condition which prevents frame pointer elimination, which is an
  /// important optimization on register-poor architectures.  Because original
  /// variable sized alloca's in the source program are the only source of
  /// variable sized stack objects, it is safe to decide whether there will be
  /// any variable sized objects before all stack objects are known (for
  /// example, register allocator spill code never needs variable sized
  /// objects).
  ///
  /// When prolog/epilog code emission is performed, the final stack frame is
  /// built and the machine instructions are modified to refer to the actual
  /// stack offsets of the object, eliminating all MO_FrameIndex operands from
  /// the program.
  ///
  /// @brief Abstract Stack Frame Information
  class MachineFrameInfo {
  
    // Represent a single object allocated on the stack.
    struct StackObject {
      // The offset of this object from the stack pointer on entry to
      // the function.  This field has no meaning for a variable sized element.
      int64_t SPOffset;
  
      // The size of this object on the stack. 0 means a variable sized object,
      // ~0ULL means a dead object.
      uint64_t Size;
  
      // The required alignment of this stack slot.
      unsigned Alignment;
  
      // If true, the value of the stack object is set before
      // entering the function and is not modified inside the function. By
      // default, fixed objects are immutable unless marked otherwise.
      bool isImmutable;
  
      // If true the stack object is used as spill slot. It
      // cannot alias any other memory objects.
      bool isSpillSlot;
  
      /// If this stack object is originated from an Alloca instruction
      /// this value saves the original IR allocation. Can be NULL.
      const AllocaInst *Alloca;
  
      // If true, the object was mapped into the local frame
      // block and doesn't need additional handling for allocation beyond that.
      bool PreAllocated;
  
      // If true, an LLVM IR value might point to this object.
      // Normally, spill slots and fixed-offset objects don't alias IR-accessible
      // objects, but there are exceptions (on PowerPC, for example, some byval
      // arguments have ABI-prescribed offsets).
      bool isAliased;
  
      StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM,
                  bool isSS, const AllocaInst *Val, bool A)
        : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM),
          isSpillSlot(isSS), Alloca(Val), PreAllocated(false), isAliased(A) {}
    };
  
    /// The alignment of the stack.
    unsigned StackAlignment;
  
    /// Can the stack be realigned.
    bool StackRealignable;
  
    /// The list of stack objects allocated.
    std::vector<StackObject> Objects;
  
    /// This contains the number of fixed objects contained on
    /// the stack.  Because fixed objects are stored at a negative index in the
    /// Objects list, this is also the index to the 0th object in the list.
    unsigned NumFixedObjects;
  
    /// This boolean keeps track of whether any variable
    /// sized objects have been allocated yet.
    bool HasVarSizedObjects;
  
    /// This boolean keeps track of whether there is a call
    /// to builtin \@llvm.frameaddress.
    bool FrameAddressTaken;
  
    /// This boolean keeps track of whether there is a call
    /// to builtin \@llvm.returnaddress.
    bool ReturnAddressTaken;
  
    /// This boolean keeps track of whether there is a call
    /// to builtin \@llvm.experimental.stackmap.
    bool HasStackMap;
  
    /// This boolean keeps track of whether there is a call
    /// to builtin \@llvm.experimental.patchpoint.
    bool HasPatchPoint;
  
    /// The prolog/epilog code inserter calculates the final stack
    /// offsets for all of the fixed size objects, updating the Objects list
    /// above.  It then updates StackSize to contain the number of bytes that need
    /// to be allocated on entry to the function.
    uint64_t StackSize;
  
    /// The amount that a frame offset needs to be adjusted to
    /// have the actual offset from the stack/frame pointer.  The exact usage of
    /// this is target-dependent, but it is typically used to adjust between
    /// SP-relative and FP-relative offsets.  E.G., if objects are accessed via
    /// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set
    /// to the distance between the initial SP and the value in FP.  For many
    /// targets, this value is only used when generating debug info (via
    /// TargetRegisterInfo::getFrameIndexReference); when generating code, the
    /// corresponding adjustments are performed directly.
    int OffsetAdjustment;
  
    /// The prolog/epilog code inserter may process objects that require greater
    /// alignment than the default alignment the target provides.
    /// To handle this, MaxAlignment is set to the maximum alignment
    /// needed by the objects on the current frame.  If this is greater than the
    /// native alignment maintained by the compiler, dynamic alignment code will
    /// be needed.
    ///
    unsigned MaxAlignment;
  
    /// Set to true if this function adjusts the stack -- e.g.,
    /// when calling another function. This is only valid during and after
    /// prolog/epilog code insertion.
    bool AdjustsStack;
  
    /// Set to true if this function has any function calls.
    bool HasCalls;
  
    /// The frame index for the stack protector.
    int StackProtectorIdx;
  
    /// The frame index for the function context. Used for SjLj exceptions.
    int FunctionContextIdx;
  
    /// This contains the size of the largest call frame if the target uses frame
    /// setup/destroy pseudo instructions (as defined in the TargetFrameInfo
    /// class).  This information is important for frame pointer elimination.
    /// If is only valid during and after prolog/epilog code insertion.
    unsigned MaxCallFrameSize;
  
    /// The prolog/epilog code inserter fills in this vector with each
    /// callee saved register saved in the frame.  Beyond its use by the prolog/
    /// epilog code inserter, this data used for debug info and exception
    /// handling.
    std::vector<CalleeSavedInfo> CSInfo;
  
    /// Has CSInfo been set yet?
    bool CSIValid;
  
    /// References to frame indices which are mapped
    /// into the local frame allocation block. <FrameIdx, LocalOffset>
    SmallVector<std::pair<int, int64_t>, 32> LocalFrameObjects;
  
    /// Size of the pre-allocated local frame block.
    int64_t LocalFrameSize;
  
    /// Required alignment of the local object blob, which is the strictest
    /// alignment of any object in it.
    unsigned LocalFrameMaxAlign;
  
    /// Whether the local object blob needs to be allocated together. If not,
    /// PEI should ignore the isPreAllocated flags on the stack objects and
    /// just allocate them normally.
    bool UseLocalStackAllocationBlock;
  
    /// Whether the "realign-stack" option is on.
    bool RealignOption;
  
    /// True if the function dynamically adjusts the stack pointer through some
    /// opaque mechanism like inline assembly or Win32 EH.
    bool HasOpaqueSPAdjustment;
  
    /// True if the function contains a call to the llvm.vastart intrinsic.
    bool HasVAStart;
  
    /// True if this is a varargs function that contains a musttail call.
    bool HasMustTailInVarArgFunc;
  
    /// True if this function contains a tail call. If so immutable objects like
    /// function arguments are no longer so. A tail call *can* override fixed
    /// stack objects like arguments so we can't treat them as immutable.
    bool HasTailCall;
  
    /// Not null, if shrink-wrapping found a better place for the prologue.
    MachineBasicBlock *Save;
    /// Not null, if shrink-wrapping found a better place for the epilogue.
    MachineBasicBlock *Restore;
  
  public:
    explicit MachineFrameInfo(unsigned StackAlign, bool isStackRealign,
                              bool RealignOpt)
        : StackAlignment(StackAlign), StackRealignable(isStackRealign),
          RealignOption(RealignOpt) {
      StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
      HasVarSizedObjects = false;
      FrameAddressTaken = false;
      ReturnAddressTaken = false;
      HasStackMap = false;
      HasPatchPoint = false;
      AdjustsStack = false;
      HasCalls = false;
      StackProtectorIdx = -1;
      FunctionContextIdx = -1;
      MaxCallFrameSize = 0;
      CSIValid = false;
      LocalFrameSize = 0;
      LocalFrameMaxAlign = 0;
      UseLocalStackAllocationBlock = false;
      HasOpaqueSPAdjustment = false;
      HasVAStart = false;
      HasMustTailInVarArgFunc = false;
      Save = nullptr;
      Restore = nullptr;
      HasTailCall = false;
    }
  
    /// Return true if there are any stack objects in this function.
    bool hasStackObjects() const { return !Objects.empty(); }
  
    /// This method may be called any time after instruction
    /// selection is complete to determine if the stack frame for this function
    /// contains any variable sized objects.
    bool hasVarSizedObjects() const { return HasVarSizedObjects; }
  
    /// Return the index for the stack protector object.
    int getStackProtectorIndex() const { return StackProtectorIdx; }
    void setStackProtectorIndex(int I) { StackProtectorIdx = I; }
    bool hasStackProtectorIndex() const { return StackProtectorIdx != -1; }
  
    /// Return the index for the function context object.
    /// This object is used for SjLj exceptions.
    int getFunctionContextIndex() const { return FunctionContextIdx; }
    void setFunctionContextIndex(int I) { FunctionContextIdx = I; }
  
    /// This method may be called any time after instruction
    /// selection is complete to determine if there is a call to
    /// \@llvm.frameaddress in this function.
    bool isFrameAddressTaken() const { return FrameAddressTaken; }
    void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
  
    /// This method may be called any time after
    /// instruction selection is complete to determine if there is a call to
    /// \@llvm.returnaddress in this function.
    bool isReturnAddressTaken() const { return ReturnAddressTaken; }
    void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; }
  
    /// This method may be called any time after instruction
    /// selection is complete to determine if there is a call to builtin
    /// \@llvm.experimental.stackmap.
    bool hasStackMap() const { return HasStackMap; }
    void setHasStackMap(bool s = true) { HasStackMap = s; }
  
    /// This method may be called any time after instruction
    /// selection is complete to determine if there is a call to builtin
    /// \@llvm.experimental.patchpoint.
    bool hasPatchPoint() const { return HasPatchPoint; }
    void setHasPatchPoint(bool s = true) { HasPatchPoint = s; }
  
    /// Return the minimum frame object index.
    int getObjectIndexBegin() const { return -NumFixedObjects; }
  
    /// Return one past the maximum frame object index.
    int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; }
  
    /// Return the number of fixed objects.
    unsigned getNumFixedObjects() const { return NumFixedObjects; }
  
    /// Return the number of objects.
    unsigned getNumObjects() const { return Objects.size(); }
  
    /// Map a frame index into the local object block
    void mapLocalFrameObject(int ObjectIndex, int64_t Offset) {
      LocalFrameObjects.push_back(std::pair<int, int64_t>(ObjectIndex, Offset));
      Objects[ObjectIndex + NumFixedObjects].PreAllocated = true;
    }
  
    /// Get the local offset mapping for a for an object.
    std::pair<int, int64_t> getLocalFrameObjectMap(int i) const {
      assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() &&
              "Invalid local object reference!");
      return LocalFrameObjects[i];
    }
  
    /// Return the number of objects allocated into the local object block.
    int64_t getLocalFrameObjectCount() const { return LocalFrameObjects.size(); }
  
    /// Set the size of the local object blob.
    void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; }
  
    /// Get the size of the local object blob.
    int64_t getLocalFrameSize() const { return LocalFrameSize; }
  
    /// Required alignment of the local object blob,
    /// which is the strictest alignment of any object in it.
    void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; }
  
    /// Return the required alignment of the local object blob.
    unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; }
  
    /// Get whether the local allocation blob should be allocated together or
    /// let PEI allocate the locals in it directly.
    bool getUseLocalStackAllocationBlock() const {
      return UseLocalStackAllocationBlock;
    }
  
    /// setUseLocalStackAllocationBlock - Set whether the local allocation blob
    /// should be allocated together or let PEI allocate the locals in it
    /// directly.
    void setUseLocalStackAllocationBlock(bool v) {
      UseLocalStackAllocationBlock = v;
    }
  
    /// Return true if the object was pre-allocated into the local block.
    bool isObjectPreAllocated(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].PreAllocated;
    }
  
    /// Return the size of the specified object.
    int64_t getObjectSize(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].Size;
    }
  
    /// Change the size of the specified stack object.
    void setObjectSize(int ObjectIdx, int64_t Size) {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      Objects[ObjectIdx+NumFixedObjects].Size = Size;
    }
  
    /// Return the alignment of the specified stack object.
    unsigned getObjectAlignment(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].Alignment;
    }
  
    /// setObjectAlignment - Change the alignment of the specified stack object.
    void setObjectAlignment(int ObjectIdx, unsigned Align) {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      Objects[ObjectIdx+NumFixedObjects].Alignment = Align;
      ensureMaxAlignment(Align);
    }
  
    /// Return the underlying Alloca of the specified
    /// stack object if it exists. Returns 0 if none exists.
    const AllocaInst* getObjectAllocation(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].Alloca;
    }
  
    /// Return the assigned stack offset of the specified object
    /// from the incoming stack pointer.
    int64_t getObjectOffset(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      assert(!isDeadObjectIndex(ObjectIdx) &&
             "Getting frame offset for a dead object?");
      return Objects[ObjectIdx+NumFixedObjects].SPOffset;
    }
  
    /// Set the stack frame offset of the specified object. The
    /// offset is relative to the stack pointer on entry to the function.
    void setObjectOffset(int ObjectIdx, int64_t SPOffset) {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      assert(!isDeadObjectIndex(ObjectIdx) &&
             "Setting frame offset for a dead object?");
      Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset;
    }
  
    /// Return the number of bytes that must be allocated to hold
    /// all of the fixed size frame objects.  This is only valid after
    /// Prolog/Epilog code insertion has finalized the stack frame layout.
    uint64_t getStackSize() const { return StackSize; }
  
    /// Set the size of the stack.
    void setStackSize(uint64_t Size) { StackSize = Size; }
  
    /// Estimate and return the size of the stack frame.
    unsigned estimateStackSize(const MachineFunction &MF) const;
  
    /// Return the correction for frame offsets.
    int getOffsetAdjustment() const { return OffsetAdjustment; }
  
    /// Set the correction for frame offsets.
    void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; }
  
    /// Return the alignment in bytes that this function must be aligned to,
    /// which is greater than the default stack alignment provided by the target.
    unsigned getMaxAlignment() const { return MaxAlignment; }
  
    /// Make sure the function is at least Align bytes aligned.
    void ensureMaxAlignment(unsigned Align);
  
    /// Return true if this function adjusts the stack -- e.g.,
    /// when calling another function. This is only valid during and after
    /// prolog/epilog code insertion.
    bool adjustsStack() const { return AdjustsStack; }
    void setAdjustsStack(bool V) { AdjustsStack = V; }
  
    /// Return true if the current function has any function calls.
    bool hasCalls() const { return HasCalls; }
    void setHasCalls(bool V) { HasCalls = V; }
  
    /// Returns true if the function contains opaque dynamic stack adjustments.
    bool hasOpaqueSPAdjustment() const { return HasOpaqueSPAdjustment; }
    void setHasOpaqueSPAdjustment(bool B) { HasOpaqueSPAdjustment = B; }
  
    /// Returns true if the function calls the llvm.va_start intrinsic.
    bool hasVAStart() const { return HasVAStart; }
    void setHasVAStart(bool B) { HasVAStart = B; }
  
    /// Returns true if the function is variadic and contains a musttail call.
    bool hasMustTailInVarArgFunc() const { return HasMustTailInVarArgFunc; }
    void setHasMustTailInVarArgFunc(bool B) { HasMustTailInVarArgFunc = B; }
  
    /// Returns true if the function contains a tail call.
    bool hasTailCall() const { return HasTailCall; }
    void setHasTailCall() { HasTailCall = true; }
  
    /// Return the maximum size of a call frame that must be
    /// allocated for an outgoing function call.  This is only available if
    /// CallFrameSetup/Destroy pseudo instructions are used by the target, and
    /// then only during or after prolog/epilog code insertion.
    ///
    unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
    void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
  
    /// 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 not pointed to by LLVM IR
    /// values. This returns an index with a negative value.
    int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable,
                          bool isAliased = false);
  
    /// Create a spill slot at a fixed location on the stack.
    /// Returns an index with a negative value.
    int CreateFixedSpillStackObject(uint64_t Size, int64_t SPOffset);
  
    /// Returns true if the specified index corresponds to a fixed stack object.
    bool isFixedObjectIndex(int ObjectIdx) const {
      return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects);
    }
  
    /// Returns true if the specified index corresponds
    /// to an object that might be pointed to by an LLVM IR value.
    bool isAliasedObjectIndex(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].isAliased;
    }
  
    /// isImmutableObjectIndex - Returns true if the specified index corresponds
    /// to an immutable object.
    bool isImmutableObjectIndex(int ObjectIdx) const {
      // Tail calling functions can clobber their function arguments.
      if (HasTailCall)
        return false;
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].isImmutable;
    }
  
    /// Returns true if the specified index corresponds to a spill slot.
    bool isSpillSlotObjectIndex(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].isSpillSlot;
    }
  
    /// Returns true if the specified index corresponds to a dead object.
    bool isDeadObjectIndex(int ObjectIdx) const {
      assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL;
    }
  
    /// Returns true if the specified index corresponds to a variable sized
    /// object.
    bool isVariableSizedObjectIndex(int ObjectIdx) const {
      assert(unsigned(ObjectIdx + NumFixedObjects) < Objects.size() &&
             "Invalid Object Idx!");
      return Objects[ObjectIdx + NumFixedObjects].Size == 0;
    }
  
    /// Create a new statically sized stack object, returning
    /// a nonnegative identifier to represent it.
    int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS,
                          const AllocaInst *Alloca = nullptr);
  
    /// Create a new statically sized stack object that represents a spill slot,
    /// returning a nonnegative identifier to represent it.
    int CreateSpillStackObject(uint64_t Size, unsigned Alignment);
  
    /// Remove or mark dead a statically sized stack object.
    void RemoveStackObject(int ObjectIdx) {
      // Mark it dead.
      Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL;
    }
  
    /// Notify the MachineFrameInfo object that a variable sized object has been
    /// created.  This must be created whenever a variable sized object is
    /// created, whether or not the index returned is actually used.
    int CreateVariableSizedObject(unsigned Alignment, const AllocaInst *Alloca);
  
    /// Returns a reference to call saved info vector for the current function.
    const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const {
      return CSInfo;
    }
  
    /// Used by prolog/epilog inserter to set the function's callee saved
    /// information.
    void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
      CSInfo = CSI;
    }
  
    /// Has the callee saved info been calculated yet?
    bool isCalleeSavedInfoValid() const { return CSIValid; }
  
    void setCalleeSavedInfoValid(bool v) { CSIValid = v; }
  
    MachineBasicBlock *getSavePoint() const { return Save; }
    void setSavePoint(MachineBasicBlock *NewSave) { Save = NewSave; }
    MachineBasicBlock *getRestorePoint() const { return Restore; }
    void setRestorePoint(MachineBasicBlock *NewRestore) { Restore = NewRestore; }
  
    /// Return a set of physical registers that are pristine.
    ///
    /// Pristine registers hold a value that is useless to the current function,
    /// but that must be preserved - they are callee saved registers that are not
    /// saved.
    ///
    /// Before the PrologueEpilogueInserter has placed the CSR spill code, this
    /// method always returns an empty set.
    BitVector getPristineRegs(const MachineFunction &MF) const;
  
    /// Used by the MachineFunction printer to print information about
    /// stack objects. Implemented in MachineFunction.cpp.
    void print(const MachineFunction &MF, raw_ostream &OS) const;
  
    /// dump - Print the function to stderr.
    void dump(const MachineFunction &MF) const;
  };
  
  } // End llvm namespace
  
  #endif
  