<commit_before>//===-- llvm/CodeGen/MachineFrameInfo.h -------------------------*- C++ -*-===//
//
// Interface to layout of stack frame on target machine.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_FRAMEINFO_H
#define LLVM_CODEGEN_FRAMEINFO_H

#include "Support/NonCopyable.h"
#include <vector>

class MachineFunction;
class TargetMachine;

struct MachineFrameInfo : public NonCopyableV {
  const TargetMachine &target;
  
public:
  MachineFrameInfo(const TargetMachine& tgt) : target(tgt) {}
  
  // These methods provide constant parameters of the frame layout.
  // 
  virtual int  getStackFrameSizeAlignment       () const = 0;
  virtual int  getMinStackFrameSize             () const = 0;
  virtual int  getNumFixedOutgoingArgs          () const = 0;
  virtual int  getSizeOfEachArgOnStack          () const = 0;
  virtual bool argsOnStackHaveFixedSize         () const = 0;

  // This method adjusts a stack offset to meet alignment rules of target.
  // 
  virtual int  adjustAlignment                  (int unalignedOffset,
                                                 bool growUp,
                                                 unsigned int align) const {
    return unalignedOffset + (growUp? +1:-1)*(unalignedOffset % align);
  }

  // These methods compute offsets using the frame contents for a
  // particular method.  The frame contents are obtained from the
  // MachineCodeInfoForMethod object for the given method.
  // The first few methods have default machine-independent implementations.
  // The rest must be implemented by the machine-specific subclass.
  // 
  virtual int getIncomingArgOffset              (MachineFunction& mcInfo,
                                                 unsigned argNum) const;
  virtual int getOutgoingArgOffset              (MachineFunction& mcInfo,
                                                 unsigned argNum) const;
  
  virtual int getFirstIncomingArgOffset         (MachineFunction& mcInfo,
                                                 bool& growUp) const=0;
  virtual int getFirstOutgoingArgOffset         (MachineFunction& mcInfo,
                                                 bool& growUp) const=0;
  virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
                                                 bool& growUp) const=0;
  virtual int getFirstAutomaticVarOffset        (MachineFunction& mcInfo,
                                                 bool& growUp) const=0;
  virtual int getRegSpillAreaOffset             (MachineFunction& mcInfo,
                                                 bool& growUp) const=0;
  virtual int getTmpAreaOffset                  (MachineFunction& mcInfo,
                                                 bool& growUp) const=0;
  virtual int getDynamicAreaOffset              (MachineFunction& mcInfo,
                                                 bool& growUp) const=0;

  //
  // These methods specify the base register used for each stack area
  // (generally FP or SP)
  // 
  virtual int getIncomingArgBaseRegNum()               const=0;
  virtual int getOutgoingArgBaseRegNum()               const=0;
  virtual int getOptionalOutgoingArgBaseRegNum()       const=0;
  virtual int getAutomaticVarBaseRegNum()              const=0;
  virtual int getRegSpillAreaBaseRegNum()              const=0;
  virtual int getDynamicAreaBaseRegNum()               const=0;
};

#endif<commit_msg>Expose some very simple information about the frame, rather than in-depth target specific information.  Rename MachineFrameInfo to TargetFrameInfo<commit_after>//===-- llvm/Target/TargetFrameInfo.h ---------------------------*- C++ -*-===//
//
// Interface to describe the layout of a stack frame on the target machine.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TARGET_TARGETFRAMEINFO_H
#define LLVM_TARGET_TARGETFRAMEINFO_H

class MachineFunction;

struct TargetFrameInfo {
  enum StackDirection {
    StackGrowsUp,        // Adding to the stack increases the stack address
    StackGrowsDown       // Adding to the stack decreases the stack address
  };
private:
  StackDirection StackDir;
  unsigned StackAlignment;
  int LocalAreaOffset;
public:
  TargetFrameInfo(StackDirection D, unsigned StackAl, int LAO)
    : StackDir(D), StackAlignment(StackAl), LocalAreaOffset(LAO) {}

  // These methods return information that describes the abstract stack layout
  // of the target machine.

  /// getStackGrowthDirection - Return the direction the stack grows
  ///
  StackDirection getStackGrowthDirection() const { return StackDir; }

  /// getStackAlignment - This method returns the number of bytes that the stack
  /// pointer must be aligned to.  Typically, this is the largest alignment for
  /// any data object in the target.
  ///
  unsigned getStackAlignment() const { return StackAlignment; }

  /// getOffsetOfLocalArea - This method returns the offset of the local area
  /// from the stack pointer on entrance to a function.
  ///
  int getOffsetOfLocalArea() const { return LocalAreaOffset; }

  //===--------------------------------------------------------------------===//
  // These methods provide details of the stack frame used by Sparc, thus they
  // are Sparc specific.
  //===--------------------------------------------------------------------===//

  virtual int  getStackFrameSizeAlignment       () const { abort(); }
  virtual int  getMinStackFrameSize             () const { abort(); }
  virtual int  getNumFixedOutgoingArgs          () const { abort(); }
  virtual int  getSizeOfEachArgOnStack          () const { abort(); }
  virtual bool argsOnStackHaveFixedSize         () const { abort(); }

  // This method adjusts a stack offset to meet alignment rules of target.
  virtual int adjustAlignment(int unalignedOffset, bool growUp,
			      unsigned align) const { abort(); }

  // These methods compute offsets using the frame contents for a particular
  // function.  The frame contents are obtained from the MachineFunction object
  // for the given function.  The rest must be implemented by the
  // machine-specific subclass.
  // 
  virtual int getIncomingArgOffset              (MachineFunction& mcInfo,
						 unsigned argNum)const{abort();}
  virtual int getOutgoingArgOffset              (MachineFunction& mcInfo,
						 unsigned argNum)const{abort();}
  
  virtual int getFirstIncomingArgOffset         (MachineFunction& mcInfo,
						 bool& growUp) const { abort();}
  virtual int getFirstOutgoingArgOffset         (MachineFunction& mcInfo,
						 bool& growUp) const {abort();}
  virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
                                                 bool& growUp) const {abort();}
  virtual int getFirstAutomaticVarOffset        (MachineFunction& mcInfo,
                                                 bool& growUp) const {abort();}
  virtual int getRegSpillAreaOffset             (MachineFunction& mcInfo,
                                                 bool& growUp) const {abort();}
  virtual int getTmpAreaOffset                  (MachineFunction& mcInfo,
                                                 bool& growUp) const {abort();}
  virtual int getDynamicAreaOffset              (MachineFunction& mcInfo,
                                                 bool& growUp) const {abort();}

  //
  // These methods specify the base register used for each stack area
  // (generally FP or SP)
  // 
  virtual int getIncomingArgBaseRegNum()               const { abort(); }
  virtual int getOutgoingArgBaseRegNum()               const { abort(); }
  virtual int getOptionalOutgoingArgBaseRegNum()       const { abort(); }
  virtual int getAutomaticVarBaseRegNum()              const { abort(); }
  virtual int getRegSpillAreaBaseRegNum()              const { abort(); }
  virtual int getDynamicAreaBaseRegNum()               const { abort(); }
};

#endif
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