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/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
Copyright (C) 1986, 1989 Free Software Foundation, Inc.
This file is part of GDB.
GDB 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 1, or (at your option)
any later version.
GDB 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 GDB; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Note that frame.h requires param.h! */
/*
* FRAME is the type of the identifier of a specific stack frame. It
* is a pointer to the frame cache item corresponding to this frame.
* Please note that frame id's are *not* constant over calls to the
* inferior. Use frame addresses, which are.
*
* FRAME_ADDR is the type of the address of a specific frame. I
* cannot imagine a case in which this would not be CORE_ADDR, so
* maybe it's silly to give it it's own type. Life's rough.
*
* FRAME_FP is a macro which converts from a frame identifier into a
* frame_address.
*
* FRAME_INFO_ID is a macro which "converts" from a frame info pointer
* to a frame id. This is here in case I or someone else decides to
* change the FRAME type again.
*
* This file and blockframe.c are the only places which are allowed to
* use the equivalence between FRAME and struct frame_info *. EXCEPTION:
* value.h uses CORE_ADDR instead of FRAME_ADDR because the compiler
* will accept that in the absense of this file.
*/
typedef struct frame_info *FRAME;
typedef CORE_ADDR FRAME_ADDR;
#define FRAME_FP(fr) ((fr)->frame)
#define FRAME_INFO_ID(f) (f)
/*
* Caching structure for stack frames. This is also the structure
* used for extended info about stack frames. May add more to this
* structure as it becomes necessary.
*
* Note that the first entry in the cache will always refer to the
* innermost executing frame. This value should be set (is it?
* Check) in something like normal_stop.
*/
struct frame_info
{
/* Nominal address of the frame described. */
FRAME_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;
/* The frame called by the frame we are describing, or 0.
This may be set even if there isn't a frame called by the one
we are describing (.->next == 0); in that case it is simply the
bottom of this frame */
FRAME_ADDR next_frame;
/* Anything extra for this structure that may have been defined
in the machine depedent files. */
#ifdef EXTRA_FRAME_INFO
EXTRA_FRAME_INFO
#endif
/* Pointers to the next and previous frame_info's in this stack. */
FRAME next, prev;
};
/* Describe the saved registers of a frame. */
struct frame_saved_regs
{
/* 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. */
CORE_ADDR regs[NUM_REGS];
};
/* 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 FRAME selected_frame;
extern struct frame_info *get_frame_info ();
extern struct frame_info *get_prev_frame_info ();
extern FRAME create_new_frame ();
extern void get_frame_saved_regs ();
extern FRAME get_prev_frame ();
extern FRAME get_current_frame ();
extern FRAME get_next_frame ();
extern struct block *get_frame_block ();
extern struct block *get_current_block ();
extern struct block *get_selected_block ();
extern struct symbol *get_frame_function ();
extern struct symbol *get_pc_function ();
/* In stack.c */
extern FRAME find_relative_frame ();
/* Generic pointer value indicating "I don't know." */
#define Frame_unknown (CORE_ADDR)-1
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