/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
   Copyright 1986, 1989, 1991, 1992, 1999 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#if !defined (FRAME_H)
#define FRAME_H 1

/* Describe the saved registers of a frame.  */

#if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
/* XXXX - deprecated */
struct frame_saved_regs
  {
    /* For each register R (except the SP), regs[R] is the address at
       which it was saved on entry to the frame, or zero if it was not
       saved on entry to this frame.  This includes special registers
       such as pc and fp saved in special ways in the stack frame.

       regs[SP_REGNUM] is different.  It holds the actual SP, not the
       address at which it was saved.  */

    CORE_ADDR regs[NUM_REGS];
  };
#endif

/* We keep a cache of stack frames, each of which is a "struct
   frame_info".  The innermost one gets allocated (in
   wait_for_inferior) each time the inferior stops; current_frame
   points to it.  Additional frames get allocated (in
   get_prev_frame) as needed, and are chained through the next
   and prev fields.  Any time that the frame cache becomes invalid
   (most notably when we execute something, but also if we change how
   we interpret the frames (e.g. "set heuristic-fence-post" in
   mips-tdep.c, or anything which reads new symbols)), we should call
   reinit_frame_cache.  */

struct frame_info
  {
    /* Nominal address of the frame described.  See comments at FRAME_FP
       about what this means outside the *FRAME* macros; in the *FRAME*
       macros, it can mean whatever makes most sense for this machine.  */
    CORE_ADDR frame;

    /* Address at which execution is occurring in this frame.
       For the innermost frame, it's the current pc.
       For other frames, it is a pc saved in the next frame.  */
    CORE_ADDR pc;

    /* Nonzero if this is a frame associated with calling a signal handler.

       Set by machine-dependent code.  On some machines, if
       the machine-dependent code fails to check for this, the backtrace
       will look relatively normal.  For example, on the i386
       #3  0x158728 in sighold ()
       On other machines (e.g. rs6000), the machine-dependent code better
       set this to prevent us from trying to print it like a normal frame.  */
    int signal_handler_caller;

    /* For each register, address of where it was saved on entry to
       the frame, or zero if it was not saved on entry to this frame.
       This includes special registers such as pc and fp saved in
       special ways in the stack frame.  The SP_REGNUM is even more
       special, the address here is the sp for the next frame, not the
       address where the sp was saved.  */
    /* Allocated by frame_saved_regs_zalloc () which is called /
       initialized by FRAME_INIT_SAVED_REGS(). */
    CORE_ADDR *saved_regs;	/*NUM_REGS */

#ifdef EXTRA_FRAME_INFO
    /* XXXX - deprecated */
    /* Anything extra for this structure that may have been defined
       in the machine dependent files. */
      EXTRA_FRAME_INFO
#endif

    /* Anything extra for this structure that may have been defined
       in the machine dependent files. */
    /* Allocated by frame_obstack_alloc () which is called /
       initialized by INIT_EXTRA_FRAME_INFO */
    struct frame_extra_info *extra_info;

    /* Pointers to the next and previous frame_info's in the frame cache.  */
    struct frame_info *next, *prev;
  };

/* Allocate additional space for appendices to a struct frame_info. */

#ifndef SIZEOF_FRAME_SAVED_REGS
#define SIZEOF_FRAME_SAVED_REGS (sizeof (CORE_ADDR) * (NUM_REGS))
#endif
extern void *frame_obstack_alloc PARAMS ((unsigned long size));
extern void frame_saved_regs_zalloc PARAMS ((struct frame_info *));

/* Return the frame address from FR.  Except in the machine-dependent
   *FRAME* macros, a frame address has no defined meaning other than
   as a magic cookie which identifies a frame over calls to the
   inferior.  The only known exception is inferior.h
   (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there.  You cannot
   assume that a frame address contains enough information to
   reconstruct the frame; if you want more than just to identify the
   frame (e.g. be able to fetch variables relative to that frame),
   then save the whole struct frame_info (and the next struct
   frame_info, since the latter is used for fetching variables on some
   machines).  */

#define FRAME_FP(fi) ((fi)->frame)

/* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
   targets.  If FRAME_CHAIN_VALID returns zero it means that the given frame
   is the outermost one and has no caller.

   If a particular target needs a different definition, then it can override
   the definition here by providing one in the tm file.

   XXXX - both default and alternate frame_chain_valid functions are
   deprecated.  New code should use dummy frames and one of the
   generic functions. */

extern int file_frame_chain_valid (CORE_ADDR, struct frame_info *);
extern int func_frame_chain_valid (CORE_ADDR, struct frame_info *);
extern int nonnull_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
extern int generic_file_frame_chain_valid (CORE_ADDR, struct frame_info *);
extern int generic_func_frame_chain_valid (CORE_ADDR, struct frame_info *);
extern void generic_save_dummy_frame_tos PARAMS ((CORE_ADDR sp));

#if !defined (FRAME_CHAIN_VALID)
#if !defined (FRAME_CHAIN_VALID_ALTERNATE)
#define FRAME_CHAIN_VALID(chain, thisframe) file_frame_chain_valid (chain, thisframe)
#else
/* Use the alternate method of avoiding running up off the end of the frame
   chain or following frames back into the startup code.  See the comments
   in objfiles.h. */
#define FRAME_CHAIN_VALID(chain, thisframe) func_frame_chain_valid (chain,thisframe)
#endif /* FRAME_CHAIN_VALID_ALTERNATE */
#endif /* FRAME_CHAIN_VALID */

/* The stack frame that the user has specified for commands to act on.
   Note that one cannot assume this is the address of valid data.  */

extern struct frame_info *selected_frame;

/* Level of the selected frame:
   0 for innermost, 1 for its caller, ...
   or -1 for frame specified by address with no defined level.  */

extern int selected_frame_level;

extern struct frame_info *create_new_frame PARAMS ((CORE_ADDR, CORE_ADDR));

extern void flush_cached_frames PARAMS ((void));

extern void reinit_frame_cache PARAMS ((void));


#ifdef FRAME_FIND_SAVED_REGS
/* XXX - deprecated */
#define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL)
extern void get_frame_saved_regs PARAMS ((struct frame_info *,
					  struct frame_saved_regs *));
#endif

extern void set_current_frame PARAMS ((struct frame_info *));

extern struct frame_info *get_prev_frame PARAMS ((struct frame_info *));

extern struct frame_info *get_current_frame PARAMS ((void));

extern struct frame_info *get_next_frame PARAMS ((struct frame_info *));

extern struct block *get_frame_block PARAMS ((struct frame_info *));

extern struct block *get_current_block PARAMS ((void));

extern struct block *get_selected_block PARAMS ((void));

extern struct symbol *get_frame_function PARAMS ((struct frame_info *));

extern CORE_ADDR get_frame_pc PARAMS ((struct frame_info *));

extern CORE_ADDR get_pc_function_start PARAMS ((CORE_ADDR));

extern struct block *block_for_pc PARAMS ((CORE_ADDR));

extern struct block *block_for_pc_sect PARAMS ((CORE_ADDR, asection *));

extern int frameless_look_for_prologue PARAMS ((struct frame_info *));

extern void print_frame_args PARAMS ((struct symbol *, struct frame_info *,
				      int, GDB_FILE *));

extern struct frame_info *find_relative_frame PARAMS ((struct frame_info *, int *));

extern void show_and_print_stack_frame PARAMS ((struct frame_info * fi, int level, int source));

extern void print_stack_frame PARAMS ((struct frame_info *, int, int));

extern void print_only_stack_frame PARAMS ((struct frame_info *, int, int));

extern void show_stack_frame PARAMS ((struct frame_info *));

extern void select_frame PARAMS ((struct frame_info *, int));

extern void record_selected_frame PARAMS ((CORE_ADDR *, int *));

extern void select_and_print_frame PARAMS ((struct frame_info *, int));

extern void print_frame_info PARAMS ((struct frame_info *, int, int, int));

extern void show_frame_info PARAMS ((struct frame_info *, int, int, int));

extern CORE_ADDR find_saved_register PARAMS ((struct frame_info *, int));

extern struct frame_info *block_innermost_frame PARAMS ((struct block *));

extern struct frame_info *find_frame_addr_in_frame_chain PARAMS ((CORE_ADDR));

extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *));

extern CORE_ADDR generic_read_register_dummy PARAMS ((CORE_ADDR pc,
						      CORE_ADDR fp,
						      int));
extern void generic_push_dummy_frame PARAMS ((void));
extern void generic_pop_current_frame PARAMS ((void (*)(struct frame_info *)));
extern void generic_pop_dummy_frame PARAMS ((void));

extern int generic_pc_in_call_dummy PARAMS ((CORE_ADDR pc,
					     CORE_ADDR sp,
					     CORE_ADDR fp));
extern char *generic_find_dummy_frame PARAMS ((CORE_ADDR pc,
					       CORE_ADDR fp));

extern void generic_fix_call_dummy PARAMS ((char *dummy, CORE_ADDR pc, CORE_ADDR fun,
					    int nargs, struct value ** args,
					    struct type * type, int gcc_p));

extern void generic_get_saved_register PARAMS ((char *, int *, CORE_ADDR *, struct frame_info *, int, enum lval_type *));

#endif /* !defined (FRAME_H)  */