/*
 * File:
 *   irtframe.h
 * Author:
 *   Samuel A. Rebelsky, based on code from Andrew Appel
 * Version:
 *   0.1 of 23 November 1998
 * Description:
 *   A header that describes the structures used in irtframe.c.
 * See also:
 *   frame.h
 * Required headers:
 *   frame.h - defines lots of useful stuff
 *   temp.h - defines Temp_label and string
 *   tree.h - defines T_exp and T_stm
 */

#ifndef _IRTFRAME_H_
#define _IRTFRAME_H_

/***********************************************************
 * Types *
 *********/ 

/*
 * A frame.  Frames are used to gather information about memory
 * usage in functions.  
 */
struct F_frame_ {
  /* How many words have been allocated in the current frame? */
  int allocated;
  /* What label is used for the current frame? */
  Temp_label name;
  /* The intermediate-representation tree used for the view-shift */
  T_stm viewShift;
  /* The parameters */
  F_accessList formals;
}; /* struct F_frame_ */

/*
 * A storage location (or something that allows us to get a storage
 * location).
 */
struct F_access_ {
  /* Is it in a register or in a frame? */
  enum { F_inRegister, f_inFrame } kind;
  /* Kind-specific data */
  union {
    Temp_temp reg;	/* The register */
    int offset;		/* The offset in the current frame */
  } u;
}; /* struct F_access_ */

#endif /* _IRT_FRAME_H_ */